Lokacin da shuɗin methylene ke tsoma baki a gwajin da ake amfani da shi wajen auna shi

Wani ɗakin gwaje-gwaje yana renon tayin kifin zebrafish a cikin shuɗin methylene mai yawan da aka saba amfani da shi wajen reno, sannan ya auna sauya sinadaran jiki ta hanyoyi biyu. A rana ta farko, na'urar Seahorse ta nuna cewa amfani da oxygen yana ƙaruwa. A ranaku na huɗu da na biyar, farantin gwajin Alamar Blue ya nuna cewa amfani da makamashi yana raguwa. Rini ɗaya, zuriyar kifi ɗaya, amma sakamako masu karo da juna. Sai gwajin kwatanci mai bayyana abin da ke ɓoye: ramukan faranti masu ɗauke da shuɗin methylene da sinadarin gwajin Alamar Blue, ba tare da ko kifi ɗaya ba, su ma sun nuna haske ƙasa da na sinadarin gwaji kaɗai. Wani ɓangare na sakamakon ya fito ne daga halittun. Wani ɓangaren kuma, rinin ne yake tantance gwajin kansa. Wannan rarrabuwar, da aka rubuta a cikin binciken Communications Biology na 2025 kan shuɗin methylene a zebrafish masu tasowa, ita ce yadda tsoma bakin shuɗin methylene a gwaji yakan kasance, kuma ita ce dalilin da ya sa rinukan da ke shiga mu'amalar redox suke buƙatar gwaje-gwajen kwatanci da sinadaran gwaji na yau da kullum ba sa buƙata.

Abin da gwajin resazurin yake aunawa a zahiri

Alamar Blue sunan kasuwanci ne na maganin resazurin, don haka tsoma bakin shuɗin methylene a Alamar Blue da tsoma bakinsa a gwajin resazurin suna bayyana karo iri ɗaya. Resazurin da aka yi wa oxidation shuɗi ne kuma da ƙyar yake fitar da hasken fluorescence. Ƙwayoyin halitta masu gudanar da sauya sinadarai suna ba shi electron ta hanyar reduction, su mayar da shi resorufin, wanda yake ruwan hoda kuma yana fitar da hasken fluorescence mai ƙarfi kusa da tsawon zangon hasken tayarwa na 560 nm da na hasken fita na 590 nm. Zangon da za a iya amfani da shi yana kusa da 530 zuwa 570 nm don hasken tayarwa da 580 zuwa 610 nm don hasken fita, bisa ga tsarin gwajin ƙananan faranti na mai ƙera. Idan reduction ya ci gaba fiye da haka, resorufin yana komawa dihydroresorufin, wanda yake fitar da hasken fluorescence mai rauni. Saboda haka, yawan ƙwayoyin halitta a rami ko tsawaita lokacin gwaji fiye da kima yana karkatar da lanƙwasar daidaita ma'auni zuwa ƙasa a ɓangaren ƙimomi masu girma.

Yawancin electron suna fitowa daga NADH da NADPH ta hannun enzymes na reductase da diaphorase a cikin cytosol, microsomes, da mitochondria. Wannan yana sa sakamakon ya zama ma'aunin haɗaɗɗiyar damar bayar da electron, ba ƙidayar ƙwayoyin halitta masu rai ba, kuma ba ma'aunin mitochondria ba. Sigina mafi girma na iya nufin ƙarin ƙwayoyin halitta, ƙarin gudun bayar da electron a kowace ƙwayar halitta, ko duka biyun. Sinadarin da ya sauya hanyar NADH zai sauya siginar ba tare da kashe ko ƙwayar halitta ɗaya ba. Ka riƙe wannan jimlar a zuciya, domin sauya hanyar NADH shi ne abin da shuɗin methylene yake yi kullum.

Hanyoyi biyu na tsoma baki, sigina ɗaya da ya ragu

Shuɗin methylene yana karkatar da sakamakon resazurin ta hanyoyi biyu masu zaman kansu, kuma kowace hanya ita kaɗai tana rage hasken fluorescence da ake gani.

Hanya ta 1 tana da alaƙa da haske. Shuɗin methylene yana tsotse haske sosai a yankin ja, inda zangon tsotse haske na monomer yake kusa da 660 zuwa 665 nm, kuma akwai ƙarin ɓangaren dimer kusa da 607 zuwa 610 nm wanda ƙarshensa ya kai zuwa hasken da resorufin yake fitarwa kusa da 590 nm. Rinin da ke kan hanyar haske yana tsotse wani ɓangare na hasken tayarwa, sannan ya sake tsotse wani ɓangare na hasken fluorescence da aka fitar. Wannan tasirin tace haske a ciki yana rage hasken ramin ko da samar da resorufin bai sauya ba. Rarrabuwar hasken ma tana sauyawa gwargwadon yanayin rinin: wani binciken abubuwan da ke ƙayyade rarrabuwar hasken shuɗin methylene a ruwa da magungunan cyclodextrin ya bambanta monomer, dimer, da haɗin mai masauki da baƙo a matsayin nau'o'i uku masu ma'aunan tsotse haske daban-daban daga 500 zuwa 700 nm. Don haka girman kuskuren haske yana sauyawa tare da yawan rini a magani, taruwarsa, da ɗaurewarsa da wasu ƙwayoyin sinadarai. A gwaji, a bambanta rage haske ta hanyar tsotsewa kawai da kashe fluorescence ta mu'amalar ƙwayoyin sinadarai, ta amfani da gwajin dawo da siginar ƙarin da aka sani da aka bayyana a ƙasa, domin hanyar gyara kowannensu ta bambanta.

Hanya ta 2 ita ce gogayyar redox. Shuɗin methylene da aka yi wa oxidation yana karɓar electron daga NAD(P)H ya koma leuco methylene blue marar launi. Oxygen na ƙwayoyin sinadarai yana sake yi masa oxidation ya mayar da shi shuɗi, tare da samar da samfuran oxygen da aka yi wa reduction, ciki har da hydrogen peroxide. Kowane zagayen wannan tsarin yana cin ƙarfin bayar da electron da da ya rage resazurin, sannan yana amfani da oxygen yayin da yake samar da peroxide a gefe. Saboda haka, raguwar siginar Alamar Blue na iya nufin cewa electron sun bi zagayen shuɗin methylene maimakon shiga resorufin. Farantin gwajin zai nuna hakan a matsayin raguwar sauya sinadaran jiki, ko da me ƙwayoyin halittun suka yi. Sinadarai iri ɗaya suna bayyana tarko mai kama da wannan amma ta akasin hanya a na'urorin oxygen: sake yin oxidation ga rinin da aka yi wa reduction yana jawo amfani da oxygen ta mu'amalar sinadarai, ko da babu halittu. Saboda haka, ana buƙatar samfuran kwatanci na rini marasa halittu a auna numfashi ma, kamar yadda kwatancin sakamakon oxygen, ATP, da bambancin ƙarfin lantarki a membrane ya bayyana game da mitochondria.

Sauyawar sigina da sauyawar halittu na iya kasancewa gaskiya duka biyun

Binciken zebrafish yana da muhimmanci musamman domin bai ɗauki sauƙaƙƙen ra'ayin cewa ɗaya kaɗai zai iya zama gaskiya ba. Sauyin halittun ya faru da gaske: amfani da oxygen a matakin asali ya ƙaru a tayin masu kwana 1 a matakan yawan rini biyu da ake amfani da su wajen reno; numfashin da ke da alaƙa da ATP ya ƙaru a matakin da ya fi ƙasa; bambancin ƙarfin lantarki a membrane da aka auna da sinadarin JC-10 ya ƙaru a rana ta biyu; kuma rubutattun RNA na rukunin sinadaran mitochondria sun ragu a ranaku na farko da na huɗu. Kuskuren da tsarin gwaji ya haifar ma ya kasance na gaske: kifin da aka wanke sau uku kafin matakin Alamar Blue har yanzu yana ɗauke da shuɗin tabo da ake iya gani a kai, baki, da yankin jin ƙamshi. Haka kuma, ramukan faranti marasa ƙwayoyin halitta masu ɗauke da rini da sinadarin gwaji sun rasa ƙaramin adadin fluorescence mai muhimmanci a ƙididdiga da kansu. Raguwar Alamar Blue a kifin a ranaku na huɗu da na biyar ta fi tasirin da aka gani ba tare da ƙwayoyin halitta ba, don haka marubutan sun fassara sakamakon a matsayin ainihin sauyin sauya sinadaran jiki da aka gani ta ruwan tabarau ɗan karkace. Wannan ita ce fahimtar da ta dace. Sinadarin da ke zagayawa a redox kuma yake tsotse haske a matsayin shuɗin rini yakan sauya hanyar da ake nazari da mu'amalar sinadarin nuna sakamako lokaci guda. Aikin gwaje-gwajen kwatanci shi ne auna gudummawar kowannensu, ba bayyana cewa ɗayansu bai faru ba. Wani darasi makamancin haka ya fito daga aikin ɗaure rini da cyclodextrin: lokacin da ƙwayar sinadarin mai masauki ta kulle rinin, tabo da ƙarfafa karɓar glucose sun ragu tare. Hakan ya nuna cewa tasirin sauya sinadaran jiki yana buƙatar mu'amala kai tsaye da rinin, ba tasirin redox da ya bazu kawai ba. Haɗa sakamakon auna yanayin rini da sakamakon auna aikinsa shi ne abin da ke bambanta hanyar tasiri da kuskuren gwaji, kuma jagorar karanta ikirarin sauya sinadaran jiki da suka dogara da rini tana ƙara haɓaka wannan dabarar.

Gwaje-gwajen kwatanci da ke bambanta su

A yi waɗannan kafin fassara kowane sakamakon shuɗin methylene daga farantin resazurin. Yawan sinadarai a magani, muhallin reno, lokacin jira, da hasken da aka yi amfani da shi dole ne su dace da na gwajin ƙwayoyin halitta daidai, domin kowace hanya da aka bayyana a sama ta dogara da su.

Gwaje-gwajen kwatanci na 3 da 4 su ne biyun da yawancin takardun bincike suke tsallakewa kuma yawancin takardun shuɗin methylene suke buƙata. Gwajin kwatanci na 3 yana gano mu'amalar sinadarai, na 4 yana gano tasirin haske, kuma tare suna ƙayyade iyakar kuskuren gwaji kafin a yi wani ikirari game da halittu.

Hanyoyin aunawa masu zaman kansu, kowacce da nata ƙuntatawa

Babu gwaji na biyu guda ɗaya da zai tabbatar da na farko. Kowace hanyar aunawa mai zaman kanta tana kauce wa wata hanyar tsoma baki amma ta kasance a buɗe ga wata. Don haka a zaɓi haɗin da wuraren rauninsa ba sa haɗuwa. Jadawalin zaɓen gwaje-gwaje don sinadaran da ke shiga mu'amalar redox yana bayyana dabarar haɗa hanyoyin, kuma jagorar sinadaran auna bambancin ƙarfin lantarki a membrane tana bayyana ƙuntatawar fluorescence dalla-dalla.

Auna amfani da oxygen da Seahorse yana bin electron zuwa oxygen maimakon zuwa resorufin, wanda yake kauce wa mu'amalar sinadarin nuna sakamako gaba ɗaya. Amma rinin ma yana amfani da oxygen ta mu'amalar sinadarai, don haka dole ne a yi samfuran kwatanci na rini marasa mitochondria a cikin cikakken muhallin reno. Gwaje-gwajen ATP na luciferase suna amfani da hasken da mu'amalar halittu ke samarwa maimakon fluorescence na resorufin. Ta haka suna kauce wa haɗuwar zangon haske da gogayyar reductase, amma suna nuna daidaiton tarin ATP maimakon gudun samar da shi. Sinadaran auna bambancin ƙarfin lantarki a membrane kamar TMRM ko JC-10 suna amsa ko bambancin cajin lantarki ya ci gaba da kasancewa. Amma suna fitar da fluorescence a zangon hasken da ido yake gani wanda rinin yake tsotsewa, don haka ragowar shuɗin tabo yana rikitar da su ma, kuma suna buƙatar samfuran kwatanci na rini kaɗai a kowane adadin rini. Auna rubutattun RNA na ƙananan sassan rukunin sinadaran numfashi yana kauce wa batun haske gaba ɗaya kuma yana haɗa tasirin da ya faru cikin sa'o'i, wanda yake cika sakamakon faranti da ake samu cikin mintuna.

Saboda haka, mafi ƙarancin tarin shaidar da za a iya amincewa da shi don ikirarin tasirin shuɗin methylene kan sauya sinadaran jiki shi ne: sakamakon resazurin tare da gwaje-gwajen kwatanci na 1 zuwa 4, da ma'aunin ƙarshe guda ɗaya wanda ba resazurin ba ne kuma yake dogara da wata ƙa'idar kimiyyar zahiri, da bayyana ko sauyin yana nuna yawan ƙwayoyin halitta, gudun bayar da electron a kowace ƙwayar halitta, ko duka biyun. Duk abin da bai kai haka ba yana barin mai karatu ba tare da damar bambanta raguwar sauya sinadaran jiki da raguwar hasken ramin gwaji ba.

Takardar aikin sarrafa tsoma baki

A kwafi wannan takardar aiki cikin kundin ɗakin gwaje-gwaje ga kowane gwajin da ya haɗa rinin da sinadarin nuna sakamakon redox. Wannan ita ce takardar aiki ta asali da aka samar wa wannan labarin: a cika layi ɗaya ga kowane matakin yawan rini a magani.

A. Hanyoyin sigina. Ga kowane matakin yawan rini, a rubuta: yanayin monomer idan aka kwatanta da dimer da ake tsammani (ƙananan matakan micromolar idan aka kwatanta da gomomin micromolar da sama), ƙimar tsotse haske ta abin da ke cikin ramin a ƙarshe a 590 nm a ramin da ba shi da ƙwayoyin halitta, da kason siginar ƙarin resorufin da aka dawo da shi. Idan siginar da aka dawo da ita ta faɗi ƙasa da kusan 90 bisa ɗari, a ɗauki duk ƙimomin fluorescence a wannan adadin rini a matsayin waɗanda tsotse haske ya rage, ba ingantattun ma'aunan halittu ba.

B. Binciken mu'amalar sinadarai. A rubuta fluorescence na rini da sinadarin gwaji ba tare da ƙwayoyin halitta ba, a matsayin kason siginar asali ta sinadarin gwaji kaɗai a kowane lokacin karantawa. Idan bambancin yana ƙaruwa da lokaci, rinin yana mu'amala da tsarin nuna sakamako yayin gwajin, kuma karantawa a ƙarshen gwaji kaɗai za ta ruɗar. A yi la'akari da karantawa a lokuta daban-daban don bin sauyin, ko amfani da wani sinadarin nuna sakamako.

C. Tabbatar da sauyin halittu ta wata hanya. A ambaci hanyar aunawa mai zaman kanta da aka zaɓa don wannan gwajin, nata samfurin kwatanci na rini, da sakamakon da ake tsammani idan sakamakon resazurin na gaske ne. Ainihin raguwar sauya sinadaran jiki ya kamata ta sauya wani ma'auni mai zaman kansa a hanya mai dacewa. Idan ma'aunin mai zaman kansa bai yarda da shi ba, kada a amince da ko wanne sakamako tukuna; a sake tsara gwajin maimakon a ɗauki matsakaicin sakamakon biyun.

D. Jimlar hukunci. A rubuta jimla guda ɗaya mai wannan tsari: a adadin rini da matakin da aka bayyana, siginar resazurin ta sauya da adadin da aka bayyana, wanda daga cikinsa adadin da aka bayyana kuskuren gwaji ne da ya faru ba tare da ƙwayoyin halitta ba, kuma ma'aunin ƙarshe mai zaman kansa (ya yarda ko bai yarda ba). Idan wani wurin rubutawa bai cika ba, gwajin bai ƙare ba.

Shuɗin methylene har yanzu sinadari ne mai amfani wajen binciken sauya sinadaran jiki, kuma aikin zebrafish ya nuna ainihin tasiri kan mitochondria a adadin da wurare da yawa suke zubarwa ta magudanar ruwa kullum. Rinin kawai yana buƙatar a auna shi da na'urorin da ba zai iya shafar sakamakonsu ba. A tanadar masa ramukan rini kaɗai, gwajin dawo da siginar ƙarin da aka sani, da hanyar aunawa guda ɗaya da ta dogara da wata ƙa'idar kimiyyar zahiri. Hakan zai sa tsoma bakinsa ya daina zama tarko, ya koma abu da za a iya auna shi a ba shi ƙima.