Maƙala
Shuɗin methylene a ilimin ƙwayoyin halitta: abubuwan da yake shafa, samfuran gwaji, da tasirin da aka auna
Shuɗin methylene yana da ayyuka da dama a matakin kwayoyin sinadari waɗanda gwaje-gwaje suka tallafa, amma jera sunayen hanyoyin aiki kawai yana ɓoye abin da kowane gwaji ya tabbatar a zahiri. Hana aikin enzayim da aka tsarkake, sauya cin oxygen a ƙwayoyin halitta da aka raina a dakin gwaje-gwaje, da rage siginar furotin a kwakwalwar bera abubuwa ne daban-daban da aka lura da su. Suna buƙatar nau'o'in gwajin kwatantawa daban-daban, kuma suna tallafa wa ƙarshe daban-daban.
Wannan fihirisar bincike tana tsara waɗannan abubuwan da aka lura da su bisa tsari, samfurin gwaji, da ma'aunin sakamako. Hoton bangon da ke tare da ita zane ne na fahimtar tsarin gwaje-gwaje, ba hoton tantance tsarin kwayar sinadari ko hoton na'urar hangen nesa ba. Don fahimtar sinadaran da ke tushen wannan, fara da ilimin sinadaran redox da hanyoyin aikin halittu.
Fara da karanta alamomin nau'in shaida
Shaidar ilimin sinadaran halittu tana gwada wani sanannen furotin ko martanin sinadarai a wajen ƙwayar halitta mai cikakken tsari. Tana iya tabbatar da hana aiki ko canja wurin electron a ƙarƙashin ƙayyadaddun yanayi. Shaidar ƙwayoyin halitta tana ƙara batutuwan shigar sinadari, sarrafa sinadarai, rarrabuwarsu cikin sassa, da hanyoyin aiki masu hulɗa da juna. Shaidar dogaro tana tambayar ko cire wani ɓangaren hanyar aiki da ake zargi yana kawar da martanin. Shaidar halitta gaba ɗaya tana auna tasiri a dabba mai zagayawar jini, sarrafa sinadarai, da nau'o'in nama da dama.
Waɗannan alamomi suna bayyana tambayar da aka amsa, maimakon matsayin shaida a jeri guda. Gwajin katse aikin gene zai iya gano wani ɓangaren isar da sigina da ake buƙata ba tare da nuna cewa shuɗin methylene yana ɗaurewa da wannan ɓangaren kai tsaye ba. Sakamakon halayyar dabba zai iya tabbatar da wata siffa da ake iya lura da ita ba tare da gano musabbabinta a matakin kwayoyin sinadari ba.
Taswirar abubuwan da ake shafa a matakin kwayoyin sinadari mai mahaɗai
Karanta kowane layi daga hagu zuwa dama. Ginshiƙin farko yana haɗawa da tattaunawar hanyar aiki; mahaɗin binciken yana nuna tushen gwajin. Wannan taswira ce ta zaɓaɓɓun muhimman shaidu game da hanyoyin aiki, ba cikakken kundin duk wani tasirin ƙwayoyin halitta da aka ruwaito ba.
| Tsari ko abin da ake shafa | Tsarin gwaji da nau'in shaida | Ma'aunin sakamako da fassararsa |
|---|---|---|
| MAO da sarrafa sinadaran isar da saƙonnin jijiyoyi | MAO-A da MAO-B na ɗan adam da aka samar ta fasahar haɗa DNA kuma aka tsarkake; nazarin saurin martanin sinadaran halittu | Ramsay da abokan aikinsa sun auna hana aikin enzayim. MAO-A ya fi saurin shafuwa sosai; ba a auna wani ma'aunin yanayin zuciya ko serotonin na kwakwalwa ba. |
| NOS da isar da siginar cGMP | NO synthase da aka tsarkake, ƙwayoyin rufin ciki na jijiyoyin jini, jijiyoyin jini da aka ware; gwaje-gwajen sinadaran halittu da na aiki | Mayer da abokan aikinsa sun bambanta samuwar citrulline, samar da cGMP, da sakin jijiyoyin jini. Ba za a sake bayyana hana aikin NOS a matsayin hana aikin soluble guanylyl cyclase shi kaɗai ba. |
| Jigilar electron a mitochondria | Ƙwayoyin HT-22 na hippocampus na bera da aka sauya da martanin sinadaran halittu; shaidar ƙwayoyin halitta da ta sinadaran halittu | Wen da abokan aikinsa sun auna cin oxygen, ƙaruwa a acidity, ATP, da canja wurin electron mai dogaro da redox. An gwada waɗannan ma'aunan sakamako dabam-dabam. |
| Kewaye complex III | Mitochondria da aka ware daga kwakwalwar bera tare da sinadaran hana tsarin numfashi; gwajin sashen ƙwayar halitta | Wani binciken antimycin da complex III ya gano cewa ba a dawo da numfashi da bambancin ƙarfin lantarki a membrane bayan wannan toshewa ba, duk da samun farfaɗowa a wani ɓangare bayan hana aikin complex I. |
| Nrf2 da samar da sabbin mitochondria | Ƙwayoyin fibroblast na amfrayon bera masu nau'in halitta na yau da kullum da waɗanda aka katse aikin Nrf2; dogaro da gene | Stack da abokan aikinsa sun auna rubutattun RNA na martanin karewa daga oxidation. Rashin ƙaruwa a waɗannan rubutattun RNA a ƙwayoyin da aka katse aikin gene yana tallafa wa dogaro da Nrf2, ba ɗaurewa kai tsaye da Nrf2 ba. |
| Autophagy da isar da siginar mTOR | Ƙwayoyin ƙwai na hamster na Sin da ke samar da tau na ɗan adam; gwaje-gwajen masu nuna alama da rage aikin gene | Congdon da abokan aikinsa sun binciki masu nuna alamar LC3, haɗa phosphate da kinase, da tau. Rage aikin BECN1 ya kawar da martanin rage tau da aka lura da shi. |
| Sarrafa tau da kawar da furotin | Gwajin Hsp70 da aka tsarkake da ƙwayoyin HeLa masu samar da tau na ɗan adam; shaidar sinadaran halittu da ta ƙwayoyin halitta | Jinwal da abokan aikinsa sun haɗa hana aikin ATPase da raguwar tau mai dogaro da proteasome. Wannan ya bambanta da hana haɗuwar zaren tau da aka tsarkake. |
| Samuwar tarin tau mai kauri | Ɗigon tau da aka samar ta fasahar haɗa DNA sannan aka sake haɗa tsarin gwajinsu; gwajin cutarwa ga ƙwayoyin SH-SY5Y dabam | Wani binciken rabuwa zuwa sassa na 2023 ya auna samuwar ɗigo da sauyawa zuwa gel a wajen halitta, sannan ya tantance rayuwar ƙwayoyin halitta ta MTT bayan fallasa su ga nau'o'in tau da aka bar su a ƙayyadadden yanayi na ɗan lokaci. Gwajin ƙwayoyin halittar bai auna samuwar tarin tau mai kauri a cikin ƙwayoyin halitta ba. |
Taswirar abubuwan da ake shafa a matakin kwayoyin sinadari da za a iya saukewa tana adana mahaɗan binciken asali, alamomin nau'in shaida, da muhimman yanayin gwaji a takardar rubutu da za a iya sake amfani da ita.
Abubuwan da gwaje-gwajen asali suke bambantawa
Hana aikin enzayim yana da yanayin gwajinsa
Binciken enzayim na ɗan adam da aka tsarkake ya ruwaito ƙimar hana aikin MAO-A, Ki = 27 ± 3 nM, ta amfani da nazarin ɗaurewa mai ƙarfi. IC50 na MAO-A ya kasance 164 ± 8 nM a ƙarƙashin yanayin gwajin da aka bayyana. Ki da IC50 ba abubuwa ne da za a musanya ba: na biyun yana dogaro da yanayin enzayim da sinadarin da enzayim ɗin ke aiki a kansa da aka yi amfani da su wajen auna hana aiki da rabi. Babu ɗaya daga cikin waɗannan lambobin da yake adadin da za a ba ɗan adam ko yawan sinadari a cikin nama da aka yi hasashe.
Kwatantawar NOS ma tana ba da irin wannan fahimta. NO synthase da aka tsarkake ya rasa duk aikin samar da citrulline da aka auna a 30 μM na shuɗin methylene. A takardar binciken guda, guanylyl cyclase da S-nitrosoglutathione ya motsa ya buƙaci kusan 60 μM domin hana aikinsa da rabi. Saboda haka, raguwar cGMP a ƙwayoyin halitta ita kaɗai ba ta nuna cewa tasirin yana kan guanylyl cyclase ba. Tana iya nuna raguwar samar da NO da ke kunna shi.
Numfashi ba kalma ce mai ma'ana ɗaya da samar da ATP ba
A binciken HT-22, masu bincike sun yi amfani da oligomycin, FCCP, da rotenone wajen nazarin yadda tsarin numfashi yake aiki. Sun kuma auna ATP dabam. FCCP da suka yi amfani da shi wajen kwatantawa ya ƙara cin oxygen yayin da yake rage ATP a ƙwayoyin halitta, wanda ya nuna kai tsaye dalilin da ya sa bayanan cin oxygen su kaɗai ba za su iya amsa tambayar ATP ba. Jagorar da aka keɓe ga cin oxygen idan aka kwatanta da ATP tana bin wannan bambanci.
Aiki na baya a mitochondria da aka ware daga kwakwalwar bera ya yi amfani da sinadaran da tsarin ke aiki a kansu, ciki har da pyruvate da malate. A 1 μM, shuɗin methylene ya dawo da wani ɓangare na numfashin da rotenone ya hana, amma bai yi tasiri sosai bayan antimycin ba. Wannan sakamakon yana ƙayyade iƙirarin bai ɗaya cewa rinin koyaushe yana kewaye complex I da III duka. Nau'in halitta, yadda aka shirya mitochondria, sinadaran da ake aiki a kansu, sinadaran hana aiki, da yanayin gwaji ya kamata su kasance tare da kowane zane da aka gabatar na canja wurin electron.
Martanin gene ba hujjar hulɗa kai tsaye da abin da ake shafa ba ne
A gwajin Nrf2, 0.1, 1, da 10 μM na shuɗin methylene sun ƙara rubutaccen RNA na HO1 a ƙwayoyin fibroblast na amfrayon bera masu nau'in halitta na yau da kullum, yayin da babu wannan martanin a ƙwayoyin da aka katse aikin Nrf2. Wannan kwatantawar gene ta fi ba da bayani game da dogaro da hanyar aiki fiye da auna samar da kayayyakin gene a ƙwayoyin da aka yi wa gwaji kawai.
Duk da haka, har yanzu ba a gano abin da ya fara faruwa a matakin kwayoyin sinadari ba. Samar da RNA mai dogaro da Nrf2, samar da sabbin mitochondria, sauyin daidaiton NAD+/NADH, da isar da siginar AMPK ya kamata su kasance batutuwa dabam har sai wani gwaji ya haɗa su. Ƙaruwar samar da kayan gene ɗaya na mitochondria ba ta tabbatar da cewa ƙwayoyin halitta sun samar da ƙarin mitochondria masu aiki ba.
Kawar da furotin yana da hanyoyi da dama
Binciken autophagy ya fallasa ƙwayoyin CHO masu samar da tau ga 0.01 μM na shuɗin methylene na tsawon awa shida, sannan ya kwatanta su da ƙwayoyin da aka ba ruwan ɗaukar sinadarin kawai. Mai nuna alamar LC3 mai launin ja/kore a jere ya taimaka wajen bambanta vesicles na matakan farko da autolysosomes waɗanda suka ƙara acidity; bafilomycin ya samar da yanayin kwatantawa da ya hana gudanawar tsarin. Rage aikin BECN1 ya gwada ko na'urorin autophagy sun taimaka wajen rage tau. Waɗannan gwaje-gwajen sun wuce ƙirga ɗigon da ke nuna LC3 kawai, domin waɗannan ɗigon na iya taruwa idan samarwa ya ƙaru ko kawarwa ta yi jinkiri.
Akasin haka, binciken Hsp70 ya binciki aikin ATPase da kawar da tau mai dogaro da proteasome a wani tsarin ƙwayoyin halitta daban. Gwaje-gwajen tarin tau mai kauri na 2023 sun yi wata tambaya dabam: yadda kwayoyin tau suke samar da ɗigo da sauya halayen kayan da suka samar. Jimillar tau, tau da aka haɗa wa phosphate, zaren da ba ya narkewa, da tarin tau mai kama da gel ma'aunan sakamako ne daban-daban. Haɗa su cikin iƙirarin “yaƙi da tau” guda ɗaya yana ɓoye hanyar aikin da ake gwadawa.
Zaɓi gwaji na gaba bisa bambancin da ba a tantance ba
Idan ana karanta sabuwar takardar bincike, fara da fitar da ainihin sinadarin, yawan sinadarin a haɗin, tsawon lokacin fallasawa, ruwan narkarwa, yanayin haske, samfurin gwaji, abin kwatantawa, da ma'aunin sakamako kafin fassara zanen hanyar aikinta. Daidaita gwajin da iƙirarin: numfashi da gudanawar tsarin numfashi, ATP da samuwar makamashi, nazarin saurin martanin enzayim da hana aiki, da sauya aikin gene da dogaro da hanyar aiki.
Jagorar dangantakar adadin sinadari da martani tana bayani kan martanin da ke sauya alkibla idan yawan sinadarin ya sauya. Jagorar sinadaran hana oxidation da masu ƙara oxidation tana bambanta zagayawar redox da kiran abu mai hana oxidation a kowane yanayi. Shiga cikin ƙwayar halitta da rarrabuwa a membrane yana bayyana dalilin da ya sa yawan sinadarin da aka ayyana a ruwan rainon ƙwayoyin halitta ba ya zama kai tsaye yawan fallasawar cikin ƙwayoyin halitta; binciken Azure B yana bayyana dalilin da ya sa bai kamata a ɗauki nau'o'in rini masu alaƙa a matsayin abubuwan da za a musanya ba.
Sauran wallafe-wallafen bincike kuma sun tattauna aikin caspase, ferroptosis, isar da siginar kumburi, da tsufar ƙwayoyin halitta. Waɗannan hanyoyi ne masu amfani idan ma'aunin sakamakon shi ne mutuwar ƙwayoyin halitta, isar da siginar cytokine, ko tsayawar girma mai ɗorewa. Ba ƙarin hujja ba ne cewa kowane aikin kwayoyin sinadari yana faruwa a ƙwayar halitta ɗaya a yawan sinadari iri ɗaya. Wannan taswira tana nuna hanyoyin bin shaidar gwaje-gwaje; ba ta mai da waɗannan gwaje-gwajen amfanin asibiti ba.