Kev tshem tawm cov tshuaj lom los ntawm lub siab
Lub siab yog ib qho ntawm cov kabmob loj tshaj plaws thiab tseem ceeb tshaj plaws hauv tib neeg lub cev. Ntxiv nrog rau kev ua lub luag haujlwm tseem ceeb hauv kev ua haujlwm ntawm lub cev thiab kev tsim cov tshuaj tseem ceeb xws li cov protein thiab cov tshuaj hormones, lub siab kuj tseem yog lub hauv paus tseem ceeb ntawm lub cev tshem tawm cov tshuaj lom. Kev tshem tawm cov tshuaj lom yog cov txheej txheem ntawm kev tshem tawm cov tshuaj lom lossis cov tshuaj lom tawm ntawm lub cev, uas tuaj yeem los ntawm ntau qhov chaw xws li zaub mov, dej haus, tshuaj, thiab ib puag ncig. Tsab xov xwm no yuav tham txog lub siab cov txheej txheem tshem tawm cov tshuaj lom kom tob.
Cov Qauv thiab Kev Ua Haujlwm ntawm Lub Siab
Lub siab nyob rau sab xis saum toj ntawm lub plab, hauv qab lub diaphragm. Lub cev no muaj cov qauv nyuaj thiab muaj cov hlwb tshwj xeeb hu ua hepatocytes. Hepatocytes yog cov ntsiab lus tseem ceeb hauv cov txheej txheem tshem tawm cov tshuaj lom. Lub siab cov qauv kuj suav nrog cov hlab ntsha, cov kav dej kua tsib, thiab cov ntaub so ntswg sib txuas, uas pab txhawb kev ntws ntawm cov ntshav thiab kua tsib thiab txhawb nqa kev ua haujlwm ntawm lub cev.
Cov Txheej Txheem Tshem Tawm Tshuaj
Cov txheej txheem tshem tawm cov tshuaj lom hauv lub siab muaj peb theem tseem ceeb: theem I, theem II, thiab theem III. Txhua theem muaj cov txheej txheem thiab cov enzymes sib txawv rau kev tshem tawm cov tshuaj lom ntawm lub cev.
Theem I: Kev Hloov Pauv
Theem I kev tshem tawm cov tshuaj lom hauv lub cev suav nrog cov tshuaj enzymatic uas txo cov tshuaj lom ntawm cov molecule lossis npaj lawv rau kev ua ntxiv hauv theem II. Theem I cov tshuaj tiv thaiv suav nrog oxidation, txo qis, thiab hydrolysis. Cov enzymes koom nrog hauv theem no feem ntau yog cov tswv cuab ntawm cytochrome P450 (CYP450) tsev neeg.
Cytochrome P450
Cytochrome P450 yog ib pawg loj ntawm cov enzymes uas pab txhawb kev oxidation ntawm cov organic compounds. Lawv nyob hauv cov hlwb siab, tshwj xeeb tshaj yog nyob rau hauv endoplasmic reticulum . Lub luag haujlwm tseem ceeb ntawm CYP450 yog hloov kho cov qauv tshuaj lom neeg ntawm cov tshuaj lom los ntawm kev oxidation. Piv txwv li, cov enzymes no tuaj yeem koom ua ke cov pa oxygen atoms rau hauv cov hydrocarbon molecules los tsim cov hydroxides, uas yaj ntau dua hauv dej thiab yooj yim tshem tawm ntawm lub cev.
Cov Radical Dawb
Cov txheej txheem tshem tawm cov tshuaj lom hauv theem I kuj tsim cov free radicals. Free radicals yog cov molecules uas ua rau muaj kev puas tsuaj rau lub cev. Yog li ntawd, nws yog ib qho tseem ceeb uas theem I yuav tsum tau ua raws li theem II tam sim ntawd kom tshem tawm cov free radicals thiab lawv cov intermediates, tiv thaiv kev puas tsuaj ntxiv.
Theem II: Kev Sib Txuas Lus
Tom qab cov tshuaj lom tau hloov pauv hauv theem I, lawv txav mus rau theem II, qhov chaw uas lawv dhau los ntawm kev sib xyaw ua ke. Cov kev sib xyaw no ntxiv cov pab pawg polar xws li glucuronic acid, sulfate, amino acids , lossis glutathione rau cov tshuaj lom. Kev ntxiv cov pab pawg no ua rau cov tshuaj lom yaj tau hauv dej ntau dua, ua rau nws yooj yim dua rau kev tso tawm ntawm lub cev hauv cov zis lossis cov kua tsib.
Kev ua kom muaj glucuronidation
Hauv cov txheej txheem no, glucuronic acid raug ntxiv rau hauv cov tshuaj lom molecule los ntawm kev ua haujlwm ntawm cov enzyme UDP-glucuronosyltransferase. Cov txheej txheem no yog ib qho ntawm cov txheej txheem sib txuas ua ke feem ntau hauv lub cev. Piv txwv li, bilirubin, ib qho khoom tawg ntawm hemoglobin, kuj tau ua tiav los ntawm txoj kev glucuronidation rau kev tso tawm ntawm lub cev.
Kev siv sulfate
Ib yam li glucuronidation, sulfation cuam tshuam nrog kev ntxiv ib pawg sulfate rau hauv ib yam khoom lom. Cov tshuaj uas feem ntau ua los ntawm sulfation suav nrog cov tshuaj hormones steroid, qee cov tshuaj, thiab cov neurotransmitters.
Kev sib xyaw nrog Glutathione
Glutathione yog ib qho tripeptide uas muaj peb hom amino acids: glutamate, cysteine, thiab glycine. Cov txheej txheem sib txuas nrog glutathione cuam tshuam nrog kev ntxiv ib pawg glutathione rau ib yam khoom lom los ntawm cov enzyme glutathione S-transferase (GST). Qhov kev tshuaj tiv thaiv no tseem ceeb heev vim tias glutathione muaj cov khoom antioxidant muaj zog thiab tuaj yeem tshem tawm cov tshuaj lom electrophilic, uas yog cov tshuaj uas nyiam electrons.
Theem III: Kev Tso Tawm
Theem kawg ntawm cov txheej txheem tshem tawm cov tshuaj lom yog kev tso zis, qhov twg cov tshuaj uas tau hloov kho thiab ua kom yaj tau dej ntau dua raug tshem tawm ntawm lub cev. Kev tso zis tuaj yeem tshwm sim los ntawm cov zis lossis cov kua tsib. Hauv cov kua tsib, cov tshuaj lom raug thauj los ntawm lub siab mus rau lub zais zis thiab tom qab ntawd mus rau cov hnyuv, qhov chaw uas lawv raug tshem tawm hauv cov quav.
Kev tso zis los ntawm cov zis
Cov tshuaj lom uas tau sib xyaw ua ke yuav yaj tau hauv dej ntau dua thiab raug tso tawm los ntawm lub raum hauv cov zis. Lub raum ua haujlwm ua lub cev lim dej tseem ceeb, tshem tawm cov khoom pov tseg thiab tswj cov kua dej thiab electrolyte kom sib npaug.
Kev tso tawm los ntawm Bile
Cov kua tsib yog tsim los ntawm cov hepatocytes thiab muaj cov tshuaj lom uas tau ua tiav lawm thiab qee cov khoom pov tseg hauv lub cev. Cov kua tsib raug thauj mus rau lub zais zis thiab tom qab ntawd tso tawm mus rau hauv txoj hnyuv me. Cov tshuaj no thaum kawg raug tso tawm ntawm lub cev hauv cov quav.
Cov Yam Cuam Tshuam Rau Kev Tshem Tawm Cov Tshuaj Lom
Qhov ua tau zoo thiab muaj peev xwm ntawm kev tshem tawm cov tshuaj lom hauv lub siab tuaj yeem cuam tshuam los ntawm ntau yam, suav nrog cov noob caj noob ces, hnub nyoog, kev noj zaub mov, kev ua neej, thiab qee yam mob.
noob caj noob ces
Kev hloov pauv ntawm cov noob caj noob ces tuaj yeem cuam tshuam rau kev ua haujlwm ntawm cov enzymes detoxification, tshwj xeeb tshaj yog cov hauv tsev neeg cytochrome P450. Cov noob caj noob ces polymorphisms hauv cov enzymes no tuaj yeem ua rau muaj qhov sib txawv ntawm qhov nrawm ntawm kev zom cov tshuaj lom, thaum kawg cuam tshuam rau tus neeg txoj kev pheej hmoo ntawm kev lom lossis qee yam kab mob ntsig txog tshuaj lom.
Noj cov zaub mov
Kev noj haus ua lub luag haujlwm tseem ceeb hauv kev tshem tawm cov tshuaj lom hauv lub cev. Piv txwv li, cov khoom noj uas muaj cov tshuaj antioxidants ntau, xws li txiv hmab txiv ntoo thiab zaub, tuaj yeem tiv thaiv cov teebmeem ntawm cov free radicals uas tsim tawm thaum lub sijhawm I detoxification. Ntxiv mus, kev noj cov zaub cruciferous xws li broccoli thiab kale tau pom tias ua rau muaj kev ua haujlwm ntawm theem II detoxification enzymes.
Gaya Hidup
Tej yam uas ua rau lub neej zoo li haus dej cawv, haus luam yeeb, thiab raug tej yam tsis huv hauv ib puag ncig kuj tseem yuav cuam tshuam rau lub siab lub peev xwm tshem cov tshuaj lom hauv lub cev. Piv txwv li, cawv tuaj yeem ua rau lub siab puas tsuaj thiab cuam tshuam rau kev ua haujlwm ntawm cov enzymes tshem cov tshuaj lom hauv lub cev. Yog li ntawd, kev txwv kev haus dej cawv thiab kev zam kev raug cov tshuaj lom neeg yog qhov tseem ceeb rau kev tswj hwm kev ua haujlwm ntawm lub siab.
Cov Kev Mob Nkeeg
Qee yam mob, xws li kab mob siab ntev, hemochromatosis, thiab teeb meem metabolic, tuaj yeem ua rau lub siab ua haujlwm tsis zoo. Kev kho thiab kev tswj hwm cov mob no yog qhov tseem ceeb rau kev tswj lub cev lub peev xwm tshem tawm cov tshuaj lom.
Xaus
Lub siab yog ib lub cev tseem ceeb hauv lub cev txoj kev tshem tawm cov tshuaj lom. Los ntawm peb theem ntawm kev tshem tawm cov tshuaj lom - kev hloov pauv, kev sib txuas, thiab kev tso tawm - lub siab muaj peev xwm ua thiab tshem tawm ntau yam tshuaj lom ntawm lub cev. Cov txheej txheem no suav nrog ntau yam enzymes thiab cov tshuaj biochemical nyuaj. Txhawm rau kom lub siab noj qab haus huv thiab kev ua haujlwm ntawm kev tshem tawm cov tshuaj lom, nws yog ib qho tseem ceeb kom noj zaub mov kom sib npaug, zam cov tshuaj lom, thiab tswj kev ua neej noj qab haus huv. Cov yam ntxwv caj ces thiab cov mob hauv qab no kuj ua lub luag haujlwm tseem ceeb hauv lub siab lub peev xwm tshem tawm cov tshuaj lom thiab tuaj yeem cuam tshuam rau lub cev teb rau cov tshuaj lom. Ua ib lub cev tseem ceeb, kev tswj hwm kev noj qab haus huv ntawm lub siab kuj pab txhawb rau kev noj qab haus huv ntawm tag nrho lub cev.
