Nikotin - Nicotine

Nikotin
Nikotin.svg
Xtal-Mercury-3D-balls.png-dan nikotin
Klinik ma'lumotlar
Savdo nomlariNikoret, Nikotrol
AHFS /Drugs.comMonografiya
Homiladorlik
toifasi
  • AU: D.
  • BIZ: D (tavakkalchilik dalili)
Qaramlik
javobgarlik
Jismoniy: past-o'rtacha
Psixologik: o'rtacha - yuqori[1][2]
Giyohvandlik
javobgarlik
Yuqori[3]
Marshrutlari
ma'muriyat
Nafas olish; etishmovchilik; og'zaki - bukkal, til osti va yutish; transdermal; rektal
ATC kodi
Huquqiy holat
Huquqiy holat
Farmakokinetik ma'lumotlar
Protein bilan bog'lanish<5%
MetabolizmBirinchi navbatda jigar: CYP2A6, CYP2B6, FMO3, boshqalar
MetabolitlarKotinin
Yo'q qilish yarim hayot1-2 soat; 20 soatlik faol metabolit
AjratishBuyrak, siydik pH - mustaqil;[5]
10–20% (saqich), 30% (nafas olish yo'li bilan); 10–30% (intranazal)
Identifikatorlar
CAS raqami
PubChem CID
IUPHAR / BPS
DrugBank
ChemSpider
UNII
KEGG
ChEBI
ChEMBL
PDB ligand
CompTox boshqaruv paneli (EPA)
ECHA ma'lumot kartasi100.000.177 Buni Vikidatada tahrirlash
Kimyoviy va fizik ma'lumotlar
FormulaC10H14N2
Molyar massa162.236 g · mol−1
3D model (JSmol )
ChirallikChiral
Zichlik1,01 g / sm3
Erish nuqtasi-79 ° C (-110 ° F)
Qaynatish nuqtasi247 ° C (477 ° F)

Nikotin keng tarqalgan alkaloid stimulyator va bu tabiiy ravishda ishlab chiqarilgan ichida tungi rang o'simliklar oilasi (eng muhimi, ichida tamaki ). U chekishni tashlash uchun chekishni tashlash uchun ishlatiladi olib tashlash belgilari.[6][4][7][8] Nikotin a retseptorlari agonisti ko'pi bilan nikotinik atsetilxolin retseptorlari (nAChR),[9][10][11] ikkitadan tashqari nikotinik retseptorlari subbirliklari (nAChRa9 va nAChRa10 ) qaerda u a vazifasini bajaradi retseptorlari antagonisti.[9]

Nikotin taxminan 0,6-3,0 ni tashkil qiladi% tamaki quruq vaznidan.[12] Nikotin, shuningdek, qutulish mumkin bo'lgan oilada foizning milliondan bir qismining konsentratsiyasida mavjud Solanaceae, shu jumladan kartoshka, pomidor va patlıcanlar,[13] manbalar buning inson iste'molchilari uchun biologik ahamiyatga ega ekanligi to'g'risida kelishmovchiliklarga qaramay.[13] U vazifasini bajaradi antioksidiv kimyoviy; Binobarin, nikotin an sifatida keng ishlatilgan hasharotlar oldin[qachon? ],[14][15] va neonikotinoidlar, kabi imidakloprid, keng qo'llaniladi.

Nikotin juda yuqori qo'shadi,[16][17][18] sekin chiqariladigan shakllarda ishlatilmasa.[19] O'rtacha sigaret taxminan 2 mg so'rilgan nikotin hosil qiladi.[20] O'limga olib keladigan natijalar uchun taxmin qilingan quyi doza chegarasi kattalar uchun 500-1000 mg yutilgan nikotin (6,5-13 mg / kg) ni tashkil qiladi.[21][20] Nikotin giyohvandlik giyohvand moddalar bilan kuchaytirilgan xatti-harakatlar, majburiy foydalanish va abstinentsiyadan keyin relapsni o'z ichiga oladi.[22] Nikotin qaramlik bag'rikenglik, sezgirlik,[23] jismoniy qaramlik va psixologik qaramlik.[24] Nikotinga qaramlik qayg'uga sabab bo'ladi.[25][26] Nikotinni olib tashlash alomatlariga tushkun kayfiyat, stress, xavotir, asabiylik, diqqatni jamlashda qiyinchiliklar va uyquning buzilishi kiradi.[1] Yengil nikotinni olib tashlash alomatlari cheklanmagan chekuvchilarda o'lchanadi, ular odatdagi kayfiyatni faqat qonidagi nikotin miqdori ko'tarilganda, har bir sigareta bilan chekishadi.[27] Ishdan bo'shatilgandan so'ng, olib tashlash alomatlari keskin yomonlashadi, keyin asta-sekin normal holatga keladi.[27]

Nikotinni vosita sifatida ishlatish chekishni tashlash xavfsizlik tarixi yaxshi.[28] Nikotinning o'zi sog'likka zarar etkazishi bilan bog'liq.[29] Nikotin potentsial ravishda foydalanuvchilar uchun zararli hisoblanadi.[30] Kam miqdorda u yumshoq bo'ladi og'riq qoldiruvchi effekt.[30] The Amerika Qo'shma Shtatlarining umumiy jarrohi nikotinning saraton kasalligiga olib kelmasligini ko'rsatadi.[31] Nikotin ba'zi hayvon turlarida tug'ma nuqsonlarni keltirib chiqarishi isbotlangan, ammo boshqalarida emas.[32] Bu a teratogen odamlarda.[33] The o'rtacha o'ldiradigan doz odamlarda nikotin noma'lum,[34] ammo yuqori dozalarni keltirib chiqarishi ma'lum nikotin bilan zaharlanish.[31]

Foydalanadi

Tibbiy

21 mg yamoq chap qo'lga qo'llaniladi. The Cochrane hamkorlik buni topadi nikotinni almashtirish terapiyasi tomonidan muvaffaqiyatga erishish ehtimoli ko'paymoqda 50–60%, sozlamadan qat'iy nazar.[35]

Birlamchi terapevtik foydalanish nikotinni yo'qotish uchun nikotinga bog'liqlikni davolash chekish va uning sog'liqqa etkazadigan zarari. Bemorlarga nikotinning boshqariladigan darajasi beriladi milklar, teri yamoqlari, ularga qaramlikdan xalos bo'lish uchun pastil, inhaler yoki burun spreyi. A 2018 yil Cochrane hamkorlik Nikotin o'rnini bosuvchi terapiyaning barcha turlari (saqich, yamoq, lozenjlar, inhaler va burun spreyi) terapiyasining chekishni muvaffaqiyatli tashlash imkoniyatini oshirishi yuqori sifatli dalillarni aniqladi. 50–60%, sozlamadan qat'iy nazar.[35]

Birlashtirish nikotin patch saqich yoki buzadigan amallar singari tezroq ta'sir etuvchi nikotin o'rnini bosuvchi vositadan foydalanish davolanish samaradorligini kamaytiradi.[36] 4 mg va 2 mg nikotin saqichi ham muvaffaqiyatga erishish imkoniyatini oshiradi.[36]

Giyohvandlik ehtimolini maksimal darajaga ko'tarish uchun ishlab chiqarilgan rekreatsion nikotin mahsulotlaridan farqli o'laroq, nikotin o'rnini bosuvchi mahsulotlar (NRT) o'ziga qaramlikni minimallashtirishga mo'ljallangan.[31]:112 Nikotin dozasi qanchalik tez yuboriladi va so'riladi, giyohvandlik xavfi shunchalik yuqori bo'ladi.[25]

Pestitsid

Nikotin an sifatida ishlatilgan hasharotlar hech bo'lmaganda 1690-yillarda, tamaki ekstraktlari shaklida[37] (garchi tamakining boshqa tarkibiy qismlari ham pestitsid ta'siriga ega bo'lsa ham).[38] Nikotinli pestitsidlar AQShda 2014 yildan beri savdo sifatida mavjud emas,[39] va organik ekinlarda uy quradigan pestitsidlar taqiqlanadi[40] va kichik bog'bonlarga tavsiya etilmaydi.[41] Nikotinli pestitsidlar Evropa Ittifoqida 2009 yildan beri taqiqlangan.[42] Oziq-ovqatlar, masalan, Xitoy kabi nikotinli pestitsidlarga ruxsat berilgan mamlakatlardan olib kelinadi, ammo oziq-ovqat mahsulotlari maksimal nikotin darajasidan oshmasligi mumkin.[42][43] Neonikotinoidlar, nikotindan olingan va tuzilishi jihatidan shunga o'xshash, 2016 yilga kelib qishloq xo'jaligi va veterinariya zararkunandalari sifatida keng qo'llaniladi.[44][37]

Nikotin ishlab chiqaradigan o'simliklarda nikotin an antioksidiv kimyoviy; Binobarin, nikotin an sifatida keng ishlatilgan hasharotlar,[45][15] va neonikotinoidlar, kabi imidakloprid, keng qo'llaniladi.

Ishlash

Ba'zida nikotin o'z ichiga olgan mahsulotlar ishlashni yaxshilash nikotinning bilishga ta'siri. [46] 41 ning 2010 yilgi meta-tahliliikki ko'r, platsebo - nazorati ostida o'tkazilgan tadqiqotlar natijasida nikotin yoki chekish nozik vosita qobiliyatlari, diqqatni ogohlantirish va yo'naltirish, epizodik va ish xotirasi jihatlariga sezilarli ijobiy ta'sir ko'rsatdi.[47] 2015 yilgi tekshiruvda ta'kidlanishicha, a4β2 nikotinik retseptorlari diqqat ko'rsatkichlarining yaxshilanganligi uchun javobgardir;[48] orasida nikotinik retseptorlari pastki turlar, nikotin eng yuqori darajaga ega majburiy yaqinlik a4β2 retseptorida (kmen=1 nM), bu ham nikotinlarga vositachilik qiladigan biologik maqsaddir qo'shadi xususiyatlari.[49] Nikotin potentsial foydali ta'sirga ega, ammo u ham ta'sir qiladi paradoksal ta'sir, tufayli bo'lishi mumkin dozani qaytarish egri chizig'ining teskari U shakli yoki farmakokinetik Xususiyatlari.[50]

Dam olish

Nikotin a sifatida ishlatiladi rekreatsion dori.[51] Bu keng tarqalgan bo'lib, juda o'ziga qaram bo'lib, uni to'xtatish qiyin.[18] Nikotin ko'pincha majburiy ravishda ishlatiladi,[52] va qaramlik bir necha kun ichida rivojlanishi mumkin.[52][53] Dam olish uchun giyohvand moddalarni iste'mol qiluvchilar odatda nikotinni uning kayfiyatini o'zgartiruvchi ta'sirida ishlatishadi.[25] Rekreatsion nikotin mahsulotlariga quyidagilar kiradi tamaki chaynash, puro,[54] sigaretalar,[54] elektron sigaretalar,[55] snuff, tamaki tamaki,[54] va snus.

Qo'llash mumkin bo'lmagan holatlar

Tamakidan voz kechish uchun nikotindan foydalanish ozgina kontrendikatsiyaga ega.[56]

2014 yildan boshlab nikotin o'rnini bosuvchi terapiya o'spirinlarda chekishni tashlash uchun samarali bo'ladimi-yo'qmi noma'lum.[57] Shuning uchun o'spirinlarga tavsiya etilmaydi.[58] Homiladorlik paytida yoki emizishda nikotinni ishlatish xavfsiz emas, garchi bu chekishdan ko'ra xavfsizroq bo'lsa; shuning uchun homiladorlikda NRT dan foydalanish maqsadga muvofiqligi haqida bahslashmoqda.[59][60][61]

A bilan kasallangan odamlarda NRT dan foydalanishda ehtiyot choralari zarur miokard infarkti ikki hafta ichida, jiddiy yoki yomonlashuv angina pektoris va / yoki jiddiy aritmiya.[58] Saraton kasalligini davolash paytida nikotinli mahsulotlardan foydalanish tavsiya etilmaydi, chunki nikotin o'smaning o'sishiga yordam beradi, ammo chekishni tashlash uchun NRTlardan vaqtincha foydalanish tavsiya qilinishi mumkin zararni kamaytirish.[62]

Nikotinli saqich bo'lgan shaxslarda kontrendikedir temporomandibulyar qo'shma kasallik.[63] Surunkali burun kasalliklari va nafas yo'llarining og'ir reaktiv kasalligi bo'lgan odamlar, burun uchun nikotinli purkagichni qo'llashda qo'shimcha ehtiyot choralarini talab qilishadi.[58] Nikotin har qanday shaklda kontrendikedir ma'lum bo'lgan shaxslarda yuqori sezuvchanlik nikotinga.[63][58]

Yomon ta'sir

Nikotin zahar deb tasniflanadi.[64][65] Shu bilan birga, iste'molchilar tomonidan qo'llaniladigan dozalarda, bu foydalanuvchiga hech qanday xavf tug'dirmaydi.[66][67][68] A 2018 yil Cochrane hamkorlik Ko'rib chiqishda nikotin o'rnini bosuvchi terapiya bilan bog'liq 9 ta asosiy noxush hodisalar ro'yxati: bosh og'rig'i, bosh aylanishi / engil bosh aylanishi, ko'ngil aynishi / qusish, oshqozon-ichak simptomlari, uyqu / orzu muammolari,ishemik yurak urishi va ko'krak qafasidagi og'riq, teri reaktsiyalari, og'iz / burun reaktsiyalari va hiqichoq.[69] Ularning aksariyati platsebo guruhida nikotinsiz ham keng tarqalgan.[69] Yurak urishi va ko'krak qafasidagi og'riqlar "kamdan-kam" deb topilgan va platsebo guruhiga nisbatan yurakning jiddiy muammolari ko'payganligi to'g'risida dalil yo'q edi, hatto yurak kasalligi aniqlangan odamlarda ham.[35] Nikotin ta'siridan kelib chiqadigan nojo'ya ta'sirlar quyidagi jadvalda keltirilgan. Nikotin o'rnini bosuvchi terapiyani qo'llash natijasida yuzaga keladigan jiddiy noxush hodisalar juda kam uchraydi.[35] Kam miqdorda u yumshoq bo'ladi og'riq qoldiruvchi effekt.[30] Etarli darajada yuqori dozalarda nikotin ko'ngil aynishi, qusish, diareya, tuprik, bradyaritmiya va ehtimol soqchilik, gipoventiliya va o'limga olib kelishi mumkin.[70]

Umumiy nikotinni qabul qilish usuli va dozalari shakliga qarab yon ta'siri
Boshqaruv usuliDozalash shakliNikotinning yon ta'siriManbalar
BukkalNikotinli saqichOshqozon buzilishi, ko'ngil aynishi, hiqichoq, og'iz shilliq qavati yoki tishlariga shikast etkazish, tirnash xususiyati yoki karıncalanma og'iz va tomoq, og'iz mukozal yarasi, jag 'mushak og'rig'i, burping, saqich tishlarga yopishishi, yoqimsiz ta'm, bosh aylanishi, bosh aylanishi, bosh og'rig'i va uyqusizlik.[35][63]
BukkalLozengeBulantı, dispepsiya, meteorizm, bosh og'rig'i, yuqori nafas yo'llarining infektsiyalari, tirnash xususiyati (ya'ni yonish hissi), hiqichoq, tomoq og'rig'i, yo'tal, lablar qurishi va og'iz shilliq qavatida yara.[35][63]
TransdermalTransdermal
yamoq
Ilova joyidagi reaktsiyalar (ya'ni, qichima, yonish yoki eritema ), diareya, dispepsiya, qorin og'rig'i, og'izning qurishi, ko'ngil aynishi, bosh aylanishi, asabiylashish yoki bezovtalik, bosh og'rig'i, jonli orzular yoki boshqa uyquning buzilishi va asabiylashish.[35][63][71]
IntranazalBurun spreyiBurun, burun tomoq va ko'zning tirnash xususiyati, suvli ko'zlar, hapşırma va yo'tal.[35][63][72]
Og'iz orqali nafas olishInhalerDispepsiya, orofaringeal tirnash xususiyati (masalan, yo'tal, og'iz va tomoq tirnash xususiyati), rinit va bosh og'rig'i.[35][63][73]
Hammasi (o'ziga xos bo'lmagan)Periferik vazokonstriksiya, taxikardiya (ya'ni tez yurak urishi), ko'tarilgan qon bosimi va oshdi hushyorlik va kognitiv ishlash.[63][72]

Uyqu

Mumkin yon effektlar nikotin.[74]

Nikotin miqdori kamaytiradi tez ko'z harakati (REM) uxlash, sekin uyqu (SWS) va a orqali nikotin berilgan sog'lom chekmaydiganlarda umumiy uyqu vaqti transdermal yamoq, va kamayish dozaga bog'liq.[75] O'tkir nikotin intoksikatsiyasi umumiy uyqu vaqtini sezilarli darajada qisqartirishi va REM kechikishini oshirishi aniqlandi, uyqudagi kechikish va tez bo'lmagan ko'z harakati (NREM) 2-bosqich uyqu vaqti.[75][76] Depressiv chekmaydiganlar nikotinni qabul qilish paytida kayfiyatni yaxshilaydilar; ammo, keyinchalik nikotinning olib tashlanishi ham kayfiyatga, ham uyquga salbiy ta'sir qiladi.[77]

Yurak-qon tomir tizimi

A 2018 yil Cochrane-ni ko'rib chiqish kamdan-kam hollarda nikotin o'rnini bosuvchi terapiya nojo'ya ta'sirga olib kelishi mumkinligini aniqladi.ishemik ko'krak og'rig'i (ya'ni, a bilan bog'liq bo'lmagan ko'krak og'rig'i miokard infarkti ) va yurak urishi.[35] Xuddi shu sharh shuni ko'rsatdiki, nikotin o'rnini bosuvchi terapiya yurakning jiddiy noxush hodisalarini (ya'ni miyokard infarkti, qon tomir va yurak o'limi ) boshqaruv elementlariga nisbatan.[35]

Nikotinning yurak-qon tomir toksikligini 2016 yilda ko'rib chiqishda shunday xulosaga kelindi: «Hozirgi ma'lumotlarga asoslanib, biz yurak-qon tomir kasalligi bo'lmagan odamlarda elektron sigaretdan nikotinning yurak-qon tomir xavfi juda past deb hisoblaymiz. Elektron sigaretadan olingan nikotin yurak-qon tomir kasalligi bo'lgan foydalanuvchilar uchun biroz xavf tug'dirishi mumkin degan xavotirimiz bor. "[78]

Kuchaytirishning buzilishi

Drug Giyohvand moddalarni ortiqcha iste'mol qilish natijasida FosB to'planishi
ΔFosB to'planish grafigi
Yuqori qism: bu giyohvand moddalarga yuqori dozada ta'sir qilishning dastlabki ta'sirini tasvirlaydi gen ekspressioni ichida akumbens yadrosi turli xil Fos oilaviy oqsillari uchun (ya'ni, c-Fos, FosB, OsFosB, Fra1 va Fra2 ).
Pastki qismida: bu kuniga ikki marta takrorlanadigan dori-darmonlardan so'ng yadro akumbensidagi DFOSB ekspressionining tobora ortib borishini ko'rsatadi. fosforillangan (35–37 kilodalton ) ΔFosB izoformlar davom eting D1 turi o'rta tikanli neyronlar akumbens yadrosi 2 oygacha.[79][80]

Nikotin juda yuqori qo'shadi.[16][17][18] Uning o'ziga qaramligi uning qanday qo'llanilishiga bog'liq.[19] Nikotinga qaramlik ikkalasining jihatlarini ham o'z ichiga oladi psixologik qaramlik va jismoniy qaramlik, chunki kengaytirilgan foydalanishni to'xtatish ikkalasini ham ishlab chiqarishi ko'rsatilgan ta'sirchan (masalan, tashvish, asabiylashish, orzu qilish, anhedoniya ) va badandagi (kabi engil motorli disfunktsiyalar titroq ) olib tashlash alomatlari.[1] Pulni olib tashlash alomatlari bir-uch kun ichida avjiga chiqadi[81] va bir necha hafta davom etishi mumkin.[82] Ba'zi odamlar 6 oy yoki undan ko'proq vaqt davomida alomatlarga duch kelishadi.[83]

Chekish chekmaydigan chekuvchilarda odatdagidek chekishni to'xtatish, engil, ammo o'lchovli nikotinni olib tashlash alomatlarini keltirib chiqaradi.[27] Bularga biroz yomonroq kayfiyat, stress, xavotir, idrok va uyquni o'z ichiga oladi, bularning barchasi qisqa vaqt ichida keyingi sigaret bilan normal holatga keladi.[27] Chekuvchilarning kayfiyati, agar ular nikotinga bog'liq bo'lmasa, ularnikidan yomonroq; ular odatdagi kayfiyatni chekishdan keyin darhol boshdan kechirishadi.[27] Nikotinga qaramlik chekuvchilar orasida uyquning yomonligi va uxlashning qisqarishi bilan bog'liq.[84][85]

Qarindosh chekuvchilarda chekish xotira va e'tiborning buzilishini keltirib chiqaradi va chekish paytida chekish bu bilim qobiliyatlarini tortib olishdan oldingi darajaga qaytaradi.[86] Tutunni nafas olgandan keyin chekuvchilarning vaqtincha ko'paygan kognitiv darajasi nikotinni chiqarib tashlash paytida kognitiv pasayish davrlari bilan qoplanadi.[27] Shuning uchun chekuvchilar va chekuvchilarning umumiy kunlik kognitiv darajasi taxminan o'xshashdir.[27]

Nikotin faollashtiradi mezolimbik yo'l va keltirib chiqaradi Uzoq muddat OsFosB ifoda (ya'ni ishlab chiqaradi fosforillangan OsFosB izoformlar ) ichida akumbens yadrosi nafas olayotganda yoki tez-tez yoki yuqori dozalarda AOK qilganda, lekin yutish shart emas.[87][88][89] Binobarin, yuqori kunlik ta'sir (ehtimol bundan mustasno) og'iz yo'li ) nikotin uchun akumbens yadrosida DFOSB haddan tashqari ekspressiyasini keltirib chiqarishi mumkin, natijada nikotin qo'shadi.[87][88]

Saraton

Nikotinning o'zi odamlarda saraton kasalligini keltirib chiqarmasa ham,[90] a funktsiyasini bajarishi aniq emas shish paydo bo'lishini oshiruvchi vosita 2012 yildan boshlab.[91] Tomonidan 2018 yilgi hisobot Milliy fanlar, muhandislik va tibbiyot akademiyalari "Nikotinning o'simtani kuchaytiruvchisi bo'lishi mumkinligi biologik jihatdan ishonchli bo'lsa-da, mavjud dalillar, bu odam saratoniga chalinish xavfini oshirishi ehtimoldan yiroq emas".[92]

Nikotinning past darajasi hujayralar ko'payishini rag'batlantiradi[93], yuqori darajalar esa sitotoksikdir.[iqtibos kerak ] Nikotin ko'payadi xolinergik signalizatsiya va adrenerjik yo'g'on ichak saraton hujayralarida signal berish,[94] shu bilan apoptozga to'sqinlik qiladi (dasturlashtirilgan hujayralar o'limi ), o'smaning o'sishini rag'batlantirish va faollashtirish o'sish omillari va uyali mitogen kabi omillar 5-lipoksigenaza (5-LOX) va epidermal o'sish omili (EGF). Shuningdek, nikotin rag'batlantirish orqali saraton o'sishiga yordam beradi angiogenez va neovaskülarizatsiya.[95][96] Nikotin o'pka saratoni rivojlanishiga yordam beradi va uning o'pka saratoni hujayralarida mavjudligi tasdiqlangan nAChR retseptorlariga ta'siri orqali uning ko'payishini, angiogenezini, migratsiyasini va epiteliy-mezenximal o'tishini (EMT) tezlashtiradi.[97] Saraton hujayralarida nikotin epitelial-mezenximal o'tish bu saraton hujayralarini saraton kasalligini davolashga qarshi dorilarga nisbatan ancha chidamli qiladi.[98]

Nikotin kanserogen moddalarni hosil qilishi mumkin Tamakiga xos nitrosaminlar (TSNA) a orqali nitrozlash reaktsiya. Bu asosan tamakini davolash va qayta ishlashda yuz beradi. Shu bilan birga, og'iz va oshqozondagi nikotin reaksiyaga kirishishi mumkin N-nitrosonornikotin[99], ma'lum bo'lgan 1 turdagi kanserogen,[100] nikotinning tamaki bo'lmagan shakllarini iste'mol qilish kanserogenezda hali ham rol o'ynashi mumkin degan fikr.[101]

Homiladorlik va emizish

Nikotin ba'zi hayvon turlarida tug'ma nuqsonlarni keltirib chiqarishi isbotlangan, ammo boshqalarida emas;[32] binobarin, bu mumkin deb hisoblanadi teratogen odamlarda.[32] Yilda hayvonlarni o'rganish Tug'ma nuqsonlarga olib kelgan tadqiqotchilar nikotin homilaga salbiy ta'sir ko'rsatishini aniqladilar miya rivojlanishi va homiladorlik natijalari;[32][31] miyaning erta rivojlanishiga salbiy ta'sir ko'rsatishi anormallik bilan bog'liq miya metabolizmi va nörotransmitter tizimi funktsiya.[102] Nikotin gazni kesib o'tadi platsenta va sigaret chekadigan onalar singari nafas olayotgan onalarning sutida ham mavjud passiv tutun.[103]

Nikotin ta'sir qilish bachadonda homiladorlik va tug'ilishning bir nechta asoratlari uchun javobgardir: chekuvchi homilador ayollar ikkalasi uchun ham katta xavfga ega tushish va o'lik tug'ilish va nikotin ta'sirida bo'lgan bolalar bachadonda pastroq bo'lishga moyil tug'ilish vaznlari.[17] Ba'zi dalillar shuni ko'rsatmoqdaki bachadonda nikotin ta'sir qilish, keyinchalik hayotda ba'zi holatlarning paydo bo'lishiga ta'sir qiladi, shu jumladan 2-toifa diabet, semirish, gipertoniya, neyroxavioral nuqsonlar, nafas olish tizimining buzilishi va bepushtlik.[28]

Dozani oshirib yuborish

Faqatgina chekish orqali odam nikotin dozasini oshirib yuborishi ehtimoldan yiroq emas. AQSh Oziq-ovqat va dori-darmonlarni boshqarish (FDA) 2013 yilda bir nechta shakllardan foydalanish bilan bog'liq jiddiy xavfsizlik muammolari yo'qligini ta'kidladi retseptsiz sotiladigan (OTC) nikotinni almashtirish terapiyasi bir vaqtning o'zida yoki sigaretalar kabi boshqa nikotinli mahsulot bilan bir vaqtning o'zida OTC NRT dan foydalanish.[104] The o'rtacha o'ldiradigan doz odamlarda nikotinning miqdori noma'lum.[34][20] Shunga qaramay, nikotin nisbatan yuqori toksiklik kabi ko'plab boshqa alkaloidlarga nisbatan kofein, LD bo'lgan50 sichqonlarga yuborilganda 127 mg / kg.[105] Etarli darajada yuqori dozalarda, bu nikotin bilan zaharlanish bilan bog'liq,[31] bu bolalarda keng tarqalgan (zaharli va o'limga olib keladigan darajalar tana vazniga kilogramm uchun past dozalarda sodir bo'ladi[30]) kamdan-kam hollarda sezilarli darajada kasallanish yoki o'limga olib keladi.[32]

Odatda, nikotinning haddan tashqari dozasining dastlabki belgilari quyidagilarni o'z ichiga oladi ko'ngil aynish, qusish, diareya, gipersalivatsiya, qorin og'riq, taxikardiya (tez yurak urishi), gipertoniya (yuqori qon bosimi), taxipnea (tez nafas olish), bosh og'rig'i, bosh aylanishi, rangparlik (rangpar teri), eshitish yoki ko'rish buzilishi va terlash, keyin birozdan keyin belgilangan bradikardiya (sekin yurak urishi), bradipnea (sekin nafas olish) va gipotenziya (past qon bosimi).[32] Nafas olishni stimulyatsiya qilish (ya'ni taxipnea) birlamchi hisoblanadi belgilar nikotin bilan zaharlanish.[32] Etarli darajada yuqori dozalarda, uyquchanlik (uyquchanlik yoki uyquchanlik), chalkashlik, senkop (hushidan ketishdan ongni yo'qotish), nafas qisilishi, belgilangan zaiflik, soqchilik va koma sodir bo'lishi mumkin.[5][32] O'limga olib keladigan nikotin zaharlanishi tezda tutqanoqlarni keltirib chiqaradi va o'lim - bir necha daqiqada sodir bo'lishi mumkin - shunga bog'liq nafas olish falaji.[32]

Toksiklik

Bugungi kunda nikotin qishloq xo'jaligida kamroq qo'llaniladi hasharotlar zaharlanishning asosiy manbai bo'lgan. Yaqinda zaharlanish holatlari odatda ko'rinishida ko'rinadi Yashil tamaki kasalligi,[32] tasodifiy yutish tamaki yoki tamaki mahsulotlari, yoki nikotinli o'simliklarni yutish.[106][107][108] Tamaki hosilini yig'adigan yoki etishtiradigan odamlar Green Tobacco Sickness (GTS), nam tamaki barglari bilan dermal ta'sirlanish natijasida kelib chiqadigan nikotin zaharlanishiga duch kelishi mumkin. Bu ko'pincha tamaki iste'mol qilmaydigan, tajribasiz tamaki yig'im-terim mashinalarida uchraydi.[106][109] Odamlar ish joyida nikotin bilan nafas olish, teriga singib ketish, yutish yoki ko'z bilan aloqa qilish orqali ta'sir qilishi mumkin. The Mehnatni muhofaza qilish boshqarmasi (OSHA) qonuniy chegarani o'rnatdi (ta'sir qilishning ruxsat etilgan chegarasi ) nikotin ta'sirida ish joyida 0,5 mg / m3 8 soatlik ish kuni davomida teriga ta'sir qilish. AQSh Mehnatni muhofaza qilish milliy instituti (NIOSH) o'rnatdi tavsiya etilgan ta'sir qilish chegarasi (REL) 0,5 mg / m3 8 soatlik ish kuni davomida teriga ta'sir qilish. Atrof muhit darajasida 5 mg / m3, nikotin hayot va sog'liq uchun darhol xavfli.[110]

Dori vositalarining o'zaro ta'siri

Farmakodinamik

Farmakokinetik

Nikotin va sigareta ikkalasi ham tutun qo'zg'atmoq The ifoda jigar fermentlari (masalan, aniq sitoxrom P450 oqsillar) giyohvand moddalarni metabolize qiladi, bu esa o'zgarish potentsialiga olib keladi dori almashinuvi.[63]

Farmakologiya

Farmakodinamika

Nikotin a retseptorlari agonisti ko'pi bilan nikotinik atsetilxolin retseptorlari (nAChR),[9][10] ikkitadan tashqari nikotinik retseptorlari subbirliklari (nAChRa9 va nAChRa10 ) qaerda u a vazifasini bajaradi retseptorlari antagonisti.[9]

Markaziy asab tizimi

Nikotinning dopaminerjik neyronlarga ta'siri.

Majburiy ravishda nikotinik atsetilxolin retseptorlari miyada nikotin uning psixoaktiv ta'sirini keltirib chiqaradi va bir nechtasini oshiradi neyrotransmitterlar turli xil miya tuzilmalarida - bir xil "tovushni boshqarish" vazifasini bajaradi.[111][112] Nikotin miyadagi nikotinik retseptorlarga nisbatan afinitikka qaraganda yuqori skelet mushaklari Ammo toksik dozalarda u kasılmalar va nafas olish falajini keltirib chiqarishi mumkin.[113] Nikotinning selektivligi ushbu retseptorlari subtiplaridagi ma'lum bir aminokislota farqiga bog'liq deb o'ylashadi.[114] Ko'pgina giyohvand moddalar bilan taqqoslaganda nikotin odatiy emas, chunki uning tarkibi o'zgaradi stimulyator ga tinchlantiruvchi o'sish bilan dozalari, bu hodisani 1969 yilda birinchi marta ta'riflagan shifokor nomi bilan "Nesbitt paradoksi" nomi bilan tanilgan.[115][116] Juda yuqori dozalarda u namlanadi neyronal faollik.[117] Nikotin hayvonlarda xatti-harakatni qo'zg'atadi va tashvishga soladi.[5] Nikotinning eng ko'p tarqalgan metabolitini o'rganish, kotinin, nikotinning ba'zi psixoaktiv ta'sirlari kotinin vositasida bo'lishini anglatadi.[118]

Nikotin nikotin retseptorlarini faollashtiradi (xususan a4β2 nikotinik retseptorlari ) asabiylashtiradigan neyronlarda ventral tegmental maydon va ichida mezolimbik yo'l qaerda paydo bo'lishiga olib keladi dopamin.[119][120] Ushbu nikotin ta'sirida paydo bo'lgan dofaminning chiqarilishi kamida qisman faollashuvi natijasida sodir bo'ladi xolinergik-dopaminerjik mukofot havolasi ichida ventral tegmental maydon.[120][121] Nikotin ventral tegmental maydon neyronlarning otish tezligini modulyatsiya qilishi mumkin.[121] Nikotin ham ajralib chiqishiga turtki beradi endogen opioidlar ichida opioid yo'llarini faollashtiradigan mukofotlash tizimi, beri naltrekson - bir opioid retseptorlari antagonisti - nikotinni bloklaydi o'z-o'zini boshqarish.[119] Ushbu harakatlar asosan yo'q bo'lganda paydo bo'ladigan nikotinning kuchli kuchaytiruvchi ta'siri uchun katta darajada javobgardir eyforiya;[119] ammo, ba'zi bir odamlarda nikotin iste'mol qilishdan engil eyforiya paydo bo'lishi mumkin.[119] Surunkali nikotindan foydalanish I va II sinflarni inhibe qiladi giston deatsetilazalari ichida striatum, bu erda nikotinga qaramlikda rol o'ynaydi.[122][123]

Simpatik asab tizimi

Nikotinning xromaffin hujayralariga ta'siri

Nikotin ham faollashtiradi simpatik asab tizimi,[124] orqali harakat qilish splanxnik nervlar adrenal medulla, epinefrinni chiqarishni rag'batlantiradi. Ushbu nervlarning preganglionik simpatik tolalari orqali chiqarilgan atsetilxolin nikotin atsetilxolin retseptorlariga ta'sir qiladi va epinefrinni (va norepinefrinni) qon oqimi.

Adrenal medulla

Majburiy ravishda ganglion tipidagi nikotinik retseptorlari buyrak usti medulasida nikotin oqishini kuchaytiradi adrenalin (epinefrin), ogohlantiruvchi gormon va neyrotransmitter. Retseptorlar bilan bog'lanib, u hujayralardagi depolyarizatsiya va oqimini keltirib chiqaradi kaltsiy kuchlanishli kaltsiy kanallari orqali. Kaltsiy ekzotsitoz ning xromaffin granulalari va shu tariqa epinefrin (va norepinefrin) ichiga qon oqimi. Ning chiqarilishi epinefrin (adrenalin) ko'payishiga olib keladi yurak urish tezligi, qon bosimi va nafas olish, shuningdek, yuqoriroq qon glyukoza darajalar.[125]

Farmakokinetikasi

Nikotinning siydikdagi metabolitlari, umumiy siydikdagi nikotinning o'rtacha foizida aniqlanadi.[126]

Nikotin tanaga kirganda, u orqali tez tarqaladi qon oqimi va kesib o'tadi qon-miya to'sig'i ga erishish miya nafas olgandan keyin 10-20 soniya ichida.[127] The yarim umrni yo'q qilish Tanadagi nikotin ikki soat atrofida.[128] Nikotin birinchi navbatda ajratilgan yilda siydik va siydik kontsentratsiyasi qarab o'zgaradi siydik oqimining tezligi va siydik pH.[5]

Chekishdan organizm tomonidan so'rilgan nikotin miqdori ko'plab omillarga, shu jumladan tamaki turlariga, tutunning nafas olishiga va filtr ishlatilishiga bog'liq bo'lishi mumkin. Shu bilan birga, ayrim mahsulotlarning nikotin rentabelligi nikotinning qon kontsentratsiyasiga ozgina ta'sir qilishi (4,4%),[129] "past smolali va past nikotinli sigaretalarga o'tishning sog'liq uchun taxmin qilingan afzalligi, asosan, chekuvchilarning nafas olishni ko'payishi bilan qoplash tendentsiyasi bilan qoplanishi mumkin".

Nikotinning yarim yemirilish davri 1-2 soat. Kotinin qonda 18-20 soatlik yarim umr bilan qolgan nikotinning faol metaboliti bo'lib, tahlilni osonlashtiradi.[130]

Nikotin bu metabolizmga uchragan ichida jigar tomonidan sitoxrom P450 fermentlar (asosan CYP2A6 va shuningdek CYP2B6 ) va FMO3, bu tanlab metabolizmga uchraydi (S) -nikotin. Asosiy metabolit kotinin. Boshqa asosiy metabolitlarga nikotin kiradi N '-oksid, nornikotin, nikotin izometonium ioni, 2-gidroksinikotin va nikotin glyukuronid.[131] Ba'zi sharoitlarda, masalan, boshqa moddalar paydo bo'lishi mumkin miyosmin.[132]

Glyukuronidatsiya va nikotinning kotininga oksidlanish metabolizmi ikkalasi ham inhibe qilinadi mentol, qo'shimchalar yodlangan sigaretalar Shunday qilib, nikotinning yarim umrini ko'paytiradi jonli ravishda.[133]

Metabolizm

Nikotin ochlik va oziq-ovqat iste'molini kamaytiradi.[134] Tadqiqotlarning aksariyati shuni ko'rsatadiki, nikotin tana vaznini kamaytiradi, ammo ba'zi tadqiqotchilar nikotin hayvon modellarida ovqatlanishning o'ziga xos turlari bo'yicha vazn ortishiga olib kelishi mumkinligini aniqladilar.[134] Nikotinning og'irlikdagi ta'siri nikotinning stimulyatsiyasi natijasida paydo bo'ladi a3-4 nAChR retseptorlari POMC neyronlari boshq yadrosida va keyinchalik melanokortin tizimi, ayniqsa, gipotalamusning paraventrikulyar yadrosidagi ikkinchi darajali neyronlardagi melatokortin-4 retseptorlari, shu bilan ovqatlanishni inhibe qilishni modulyatsiya qiladi.[121][134] POMC neyronlari melanokortin tizimining kashfiyotchisi, tana vaznining va teri va soch kabi periferik to'qimalarning muhim regulyatoridir.[134]

Kimyo

NFPA 704
olov olmos
Nikotin uchun yong'indan olmos xavfi belgisi.[135]

Nikotin a gigroskopik, alkogol, efir yoki engil neftda oson eriydigan rangsizdan sariq-jigarranggacha, yog'li suyuqlik. Bu aralash bilan suv uning neytral ominida tayanch 60 ° C dan 210 ° C gacha hosil bo'ladi. Bu ikki asosli azotli asos, K ga egab1= 1 × 10⁻⁶, Kb2=1×10⁻¹¹.[136] U ammiakni osonlikcha hosil qiladi tuzlar bilan kislotalar odatda qattiq va suvda eriydi. Uning o't olish nuqtasi 95 ° C va uning avtomatik yonishi harorati 244 ° C dir.[137] Nikotin tezda o'zgaruvchan (bug 'bosimi 5.5 "25 da)[136] Ultraviyole nurlar yoki turli xil oksidlovchi moddalar ta'sirida nikotin nikotin oksidiga aylanadi, nikotinik kislota (niatsin, B3 vitamini) va metilamin.[138]

Nikotin bu optik jihatdan faol, ikkitasi bor enantiomerik shakllari. Nikotinning tabiiy ravishda paydo bo'lgan shakli levorotator bilan o'ziga xos aylanish [a] ningD.= –166,4 ° ((-) - nikotin). The dekstrorotatsion shakli, (+) - nikotin fiziologik jihatdan (-) - nikotinga qaraganda kamroq faoldir. (-) - nikotin (+) - nikotinga qaraganda toksikroq.[139] (+) - nikotinning tuzlari odatda dekstrorotatsion; protonatsiyaga qarab levorotatoriya va dekstrorotatoriya o'rtasidagi bunday konversiya alkaloidlar orasida keng tarqalgan.[138] Gidroxlorid va sulfat tuzlari 180 ° C dan yuqori yopiq idishda qizdirilsa optik jihatdan harakatsiz bo'ladi.[138] Anabazin a strukturaviy izomer nikotin, chunki ikkala birikmada ham mavjud molekulyar formula C10H14N2.

Protonlangan nikotinning tuzilishi (chapda) va qarama-qarshi benzoatning tuzilishi (o'ngda). Ushbu birikma o'pkaga nikotin etkazib berishni ko'paytirish uchun ba'zi vaping mahsulotlarida qo'llaniladi.

Pod rejimi elektron sigaretalar nikotinni a shaklida ishlatadi protonlangan nikotin, dan ko'ra erkin asos oldingi avlodlarda topilgan nikotin.[140]

Hodisa

Nikotin tamaki mahsuloti bo'lib, barglarida uchraydi Nicotiana tabacum naviga qarab 0,5 dan 7,5% gacha.[141] Nikotin barglarida ham uchraydi Nicotiana rustica, 2-14% miqdorida; yilda Duboisia hopwoodii; va Asclepias syriaca.[136]

Nikotin ham tabiiy ravishda ozroq miqdorda (2-7 gacha o'zgarib turadi).g /kg, yoki foiz og'irligining 20-70 milliondan bir qismi[13]) ichida Solanaceaein oiladan o'simliklar Solanaceae (kabi kartoshka, pomidor, baqlajon va qalampir[13]).[142]

Pomidor tarkibidagi nikotin miqdori meva pishishi bilan sezilarli darajada kamayadi.[13] Choy barglarida nikotin miqdori juda mos kelmaydi va ba'zi hollarda Solanaceae mevalaridan ancha katta.[13] 1999 yildagi hisobotda "Ba'zi bir hujjatlarda parhez nikotin iste'mol qilishning hissasi ETS (atrofdagi tamaki tutuni) ta'siriga yoki oz miqdordagi sigaretani faol chekish bilan taqqoslaganda katta ekanligi ta'kidlangan. Boshqalar dietani iste'mol qilishni ahamiyatsiz deb hisoblashadi. juda ko'p miqdordagi o'ziga xos sabzavotlar iste'mol qilinadi. "[13] Kuniga iste'mol qilinadigan nikotin miqdori taxminan 1,4 va 2,25 atrofida.g / kun 95-foizda.[13] Oziq-ovqat mahsulotlarini iste'mol qilish ma'lumotlari etarli emasligi sababli bu raqamlar past bo'lishi mumkin.[13] Solanum oilasidan nikotin miqdori, shu jumladan kartoshka, pomidor, baqlajon va Kapsikum oilasiga mansub qismlar milliardga teng bo'lganligi sababli, ularni o'lchash qiyin.[143]

Biosintez

Nikotin biosintezi

Nikotinning biosintetik yo'li nikotinni o'z ichiga olgan ikki tsiklik tuzilish o'rtasidagi birikish reaktsiyasini o'z ichiga oladi. Metabolik tadqiqotlar shuni ko'rsatadiki piridin nikotinning halqasi olingan natsin (nikotinik kislota) esa pirrolidin dan olingan N-metil-Δ1- pirrolidiyum kationi.[144][145] Ikki komponentli tuzilmalarning biosintezi ikkita mustaqil sintez orqali davom etadi: niatsin uchun NAD yo'li va tropan yo'li uchun N-metil-Δ1- pirrolidiyum kationi.

Ushbu turdagi NAD yo'li Nikotiana aspartik kislota aspartat oksidaz (AO) bilan a-imino suktsinatiga oksidlanishidan boshlanadi. Buning ortidan kondensatsiya bo'ladi glitseraldegid-3-fosfat va kinolinat sintaz (QS) bilan katalizlangan siklizatsiya kinolinik kislota. Keyin kinolinik kislota kinolinik kislota fosforibosil transferaza (QPT) tomonidan katalizlangan fosforiboksil pirofosfat bilan reaksiyaga kirishib, niatsin mononukleotid (NaMN) hosil qiladi. Endi reaktsiya NAD ni qutqarish tsikli orqali kontsentratsiya orqali niatsin ishlab chiqarish uchun davom etadi nikotinamid ferment tomonidan nikotinamidaza.[146]

The N-metil-Δ1- nikotin sintezida ishlatiladigan pirrolidiyum kationi tropandan olinadigan alkaloidlarni sintez qilishda oraliq vositadir. Biosintez bilan boshlanadi dekarboksilatsiya ning ornitin ishlab chiqarish uchun ornitin dekarboksilaza (ODC) bilan chiriyotgan. Keyinchalik Putrescine aylanadi N-metil putresin metilatsiya putressin bilan katalizlangan SAM tomonidan N-metiltransferaza (PMT). N-methylputrescine keyin o'tadi zararsizlantirish tomonidan 4-metilaminobutanalga N-methylputrescine oxidase (MPO) fermenti, 4-metilaminobutanal, keyin o'z-o'zidan tsiklga aylanadi N-metil-Δ1- pirrolidiyum kationi.[147]

Nikotinni sintez qilishning yakuniy bosqichi bu o'zaro bog'lanishdir N-metil-Δ1-pirrolidiyum kationi va niatsin. Tadqiqotlar ikkala tarkibiy tuzilmalar orasidagi bog'lanishning biron bir shakliga yakun yasaganiga qaramay, aniq jarayon va mexanizm aniqlanmagan bo'lib qolmoqda. Amaldagi kelishilgan nazariya niasinni 3,6-dihidronikotinik kislota orqali 2,5-dihidropiridinga aylantirishni o'z ichiga oladi. Keyin 2,5-dihidropiridin oraliq moddasi bilan reaksiyaga kirishadi N-metil-Δ1-pirrolidiyum kationini hosil qilish uchun enantiomerik jihatdan toza (-) - nikotin.[148]

Tana suyuqliklarini aniqlash

Nikotinni qon, plazma yoki siydikda aniqlash mumkin, zaharlanish tashxisini tasdiqlash yoki tibbiy o'lim bo'yicha tekshiruvni osonlashtirish uchun. Ishdan oldin va tibbiy sug'urta tibbiy skrining dasturlari uchun siydik yoki tuprik tarkibidagi kotinin konsentratsiyasi tez-tez o'lchanadi. Natijalarni sinchkovlik bilan izohlash juda muhimdir, chunki sigaretaning tutuniga passiv ta'sir qilish nikotinning sezilarli darajada to'planishiga, so'ngra uning organizmdagi turli suyuqliklarda metabolitlarining paydo bo'lishiga olib kelishi mumkin.[149][150] Nikotindan foydalanish raqobatdosh sport dasturlarida tartibga solinmagan.[151]

Tarix, jamiyat va madaniyat

Nikotin dastlab tamaki zavodidan 1828 yilda kimyogarlar Vilgelm Geynrix Posselt va Karl Lyudvig Reyman tomonidan ajratilgan. Germaniya, bu zahar ekanligiga kim ishongan.[152][153] Uning kimyoviy moddasi empirik formula tomonidan tasvirlangan Melsens 1843 yilda,[154] uning tuzilishi tomonidan kashf etilgan Adolf Pinner va Richard Volffenshteyn 1893 yilda,[155][156][157][tushuntirish kerak ] va u birinchi marta sintez qilingan Amé Pictet va 1904 yilda A. Rotschi.[158]

Nikotin tamaki zavodi nomi bilan atalgan Nicotiana tabacum, bu o'z navbatida nomi bilan nomlangan Frantsuzcha elchi Portugaliya, Jan Nikot de Villemen, kimga tamaki va urug'larni yuborgan Parij 1560 yilda frantsuz qiroliga taqdim etilgan,[159] va ularning dorivor qo'llanilishini kim ilgari surdi. Chekish kasallikdan, ayniqsa vabodan himoya qiladi deb ishonishgan.[159]

Tamaki bilan tanishtirildi Evropa 1559 yilda va 17 asr oxirlarida u nafaqat uchun ishlatilgan chekish shuningdek hasharotlar. Keyin Ikkinchi jahon urushi, dunyo bo'ylab 2500 tonnadan ortiq nikotin insektitsid ishlatilgan, ammo 1980 yillarga kelib nikotin insektitsididan foydalanish 200 tonnadan kam bo'lgan. Bunga arzon va zararli bo'lmagan boshqa hasharotlar borligi sabab bo'lgan sutemizuvchilar.[15]

Vaqt o'tishi bilan mashhur Amerika brendidagi sigaretalarning nikotin miqdori oshdi va bitta tadqiqot shuni ko'rsatdiki, 1998 va 2005 yillar orasida yiliga o'rtacha 1,78 foizga o'sish kuzatilgan.[160]

Huquqiy holat

Qo'shma Shtatlarda nikotinli mahsulotlar va nikotolni almashtirish terapiyasi mahsulotlari, masalan, nikotrol faqat 21 va undan yuqori yoshdagilar uchun mavjud; yoshni tasdiqlovchi hujjat talab qilinadi; savdo avtomatida yoki yoshi tasdiqlanmaydigan har qanday manbadan sotilmaydi. Ba'zi shtatlarda[qayerda? ], ushbu mahsulotlar faqat 21 yoshdan katta shaxslar uchun mavjud.[tibbiy ma'lumotnoma kerak ][qayerda? ] AQShning ko'plab shtatlari a Tamaki 21 eng kam yoshni 18 yoshdan 21 yoshgacha ko'targan tamaki mahsulotlari to'g'risidagi qonun.[161] 2019 yildan boshlab tamaki iste'mol qilishning minimal yoshi federal darajada 21 yoshni tashkil etadi.

Evropa Ittifoqida nikotin mahsulotlarini sotib olishning minimal yoshi - 18, ammo tamaki yoki nikotin mahsulotlarini ishlatish uchun minimal yosh talablari mavjud emas.[162]

Ommaviy axborot vositalarida

Tashqi rasm
rasm belgisi Supermendan qochib ketayotgan Nik O'Tinning tasviri, Comic Vine

Ba'zilarida chekishga qarshi adabiyot, tamaki chekish va nikotin giyohvandligining zarari, Nik O'Tin sifatida gumanoid sifatida ifodalanadi, u o'ziga yoki uning kiyimi va shlyapasiga tegishli sigareta yoki sigaret qutisining ba'zi jihatlari bilan ajralib turadi.[163] Nik O'Teen uchun yaratilgan yomon odam edi Sog'liqni saqlash bo'yicha ta'lim kengashi.[163]

Nikotin 1980 yilda tamaki sanoati tomonidan reklama reklamalarida kofein bilan taqqoslangan, keyinroq esa 2010 yilda elektron sigaretalar sanoatida nikotinni iste'mol qilish bilan bog'liq stigmatizatsiya va xatarlarni kamaytirish maqsadida.[164]

Tadqiqot

Markaziy asab tizimi

Nikotinni o'tkir / boshlang'ich darajada qabul qilish neyronal nikotin retseptorlarini faollashishiga olib keladigan bo'lsa, nikotinni surunkali past dozalarda iste'mol qilish ushbu retseptorlarning desensitizatsiyasiga olib keladi (bag'rikenglikning rivojlanishi tufayli) va antidepressant ta'sirga olib keladi, bu esa past dozada nikotin yamoqlarini ko'rsatadigan dastlabki tadqiqotlar bilan bog'liq. samarali davolash katta depressiv buzilish chekmaydiganlarda.[165]

Garchi tamaki chekish xavfi ortishi bilan bog'liq bo'lsa-da Altsgeymer kasalligi,[166] nikotinning o'zi Altsgeymer kasalligini oldini olish va davolash imkoniyatiga ega ekanligi haqida dalillar mavjud.[167]

Chekish Parkinson kasalligi xavfining pasayishi bilan bog'liq; ammo, bu sog'lom miya dopaminerjik mukofot markazlari (Parkinson kasalligiga chalingan miyaning maydoni) bo'lgan odamlarning chekishni yaxshi ko'rishi va shu tariqa odatlanishni, nikotin to'g'ridan-to'g'ri neyroprotektor sifatida harakat qilishi yoki boshqa narsalarga ega bo'lishi sababli noma'lum. neyroprotektiv vosita sifatida ishlaydigan sigareta tutunidagi birikmalar.[168]

Immunitet tizimi

Ikkala immunitet hujayralari Tug'ma immunitet tizimi va adaptiv immunitet tizimlari a2, a5, a6, a7, a9 va a10 ni tez-tez ifoda eting nikotinik atsetilxolin retseptorlari subbirliklari.[169] Dalillar shuni ko'rsatadiki, ushbu kichik birliklarni o'z ichiga olgan nikotinik retseptorlari tartibga solishda ishtirok etadi immunitet funktsiyasi.[169]

Optofarmakologiya

A fotoaktivatsiya form of nicotine, which releases nicotine when exposed to ultrabinafsha nur with certain conditions, has been developed for studying nicotinic acetylcholine receptors in brain tissue.[170]

Oral health

Bir nechta in vitro studies have investigated the potential effects of nicotine on a range of oral cells. A recent systematic review concluded that nicotine was unlikely to be cytotoxic to oral cells in vitro in most physiological conditions but further research is needed.[171] Understanding the potential role of nicotine in oral health has become increasingly important given the recent introduction of novel nicotine products and their potential role in helping smokers quit.[172]

Shuningdek qarang

Adabiyotlar

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    Xulosa
    ΔFosB is an essential transcription factor implicated in the molecular and behavioral pathways of addiction following repeated drug exposure. The formation of ΔFosB in multiple brain regions, and the molecular pathway leading to the formation of AP-1 complexes is well understood. The establishment of a functional purpose for ΔFosB has allowed further determination as to some of the key aspects of its molecular cascades, involving effectors such as GluR2 (87,88), Cdk5 (93) and NFkB (100). Moreover, many of these molecular changes identified are now directly linked to the structural, physiological and behavioral changes observed following chronic drug exposure (60,95,97,102). New frontiers of research investigating the molecular roles of ΔFosB have been opened by epigenetic studies, and recent advances have illustrated the role of ΔFosB acting on DNA and histones, truly as a ‘‘molecular switch’’ (34). As a consequence of our improved understanding of ΔFosB in addiction, it is possible to evaluate the addictive potential of current medications (119), as well as use it as a biomarker for assessing the efficacy of therapeutic interventions (121,122,124).
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