Te Tūranga o te Mitochondria i roto i te Whakaputa Pūngao Pūtau
Ko te Mitochondria, e kiia ana ko ngā "pūnaha hiko o te pūtau," he whekau nui e kitea ana i roto i te cytoplasm o te nuinga o ngā pūtau eukaryotic. E mōhiotia ana ēnei hanganga kiri-rua mō tā rātou mahi ki te whakaputa pūngao mā roto i ngā tukanga matū koiora e matua ana ki te pākia me te ora o ngā pūtau. Mā te mārama ki te mahi a te mitochondria i roto i te whakaputa pūngao pūtau ka kitea ngā āhuatanga nui o te koiora, te rongoā, me te koiora-pūngao.
Hanganga o te Mitochondria
Ko ngā mitochondria he āhua ahurei, arā, he kiriuhi o waho, he wāhi i waenganui i ngā kiriuhi, he kiriuhi o roto, me te matrix. He ngāwari te uru o te kiriuhi o waho, e āhei ai ngā ngota tae atu ki tētahi rahi kia haere noa. Ko te kiriuhi o roto, i tētahi atu ringa, he tino whiriwhiri, ā, kei roto ko ngā kopa e mōhiotia ana ko ngā cristae. Ka whakanui ake ēnei cristae i te horahanga mata mō ngā tauhohenga matū koiora. Kei roto i te matrix, e kapi ana i te kiriuhi o roto, ngā whākōkī, te DNA mitochondrial (mtDNA), ngā ribosome, me ngā momo matū wairewa e whai wāhi ana ki te mahi mitochondrial.
Ngā Mahi a te Mitochondria
Hanga ATP
Ko te mahi matua a ngā mitochondria i roto i te whakaputanga pūngao pūtau kei roto i tō rātou kaha ki te hanga adenosine triphosphate (ATP), te pūngao matua o te pūtau. Ko tēnei tukanga, e mōhiotia ana ko te oxidative phosphorylation, e uru ana ki tētahi raupapa o ngā tauhohenga redox e puta ana i roto i te kiriuhi o roto o te mitochondria.
Te Whakawhanautanga Oxidative
E rua ngā wāhanga matua o te phosphorylation oxidative: te mekameka kawe hiko (ETC) me te ATP Synthase.
Mekameka Kawe Irahiko (ETC):
Ko te ETC he raupapa o ngā matatini pūmua me ngā ngota iti kua whakauruhia ki roto i te kiriuhi mitochondrial o roto. Kei roto ko ngā Matatini I, II, III, me IV, me ngā kaikawe irahiko neke e rua, te ubiquinone (coenzyme Q) me te cytochrome c. Ko ngā irahiko i ahu mai i te waikura o ngā matūkai, pērā i te glucose me ngā waikawa ngako, ka whakawhitia mā roto i ēnei matatini, ka akiaki i te pupuhi o ngā protons (H⁺) mai i te matrix ki te wāhi intermembrane. Mā tēnei pupuhi proton ka whakatū he rōnaki hikohiko, e mōhiotia ana ko te kaha nekehanga proton (PMF).
Te Hanganga ATP:
He whākōkī whakamiharo te ATP Synthase kei roto i te kiriuhi mitochondrial o roto. Ka whakamahia e ia te pūngao mai i te rere o ngā porotana ki roto i te matrix—e peia ana e te PMF—hei whakatere i te hanganga o te ATP mai i te adenosine diphosphate (ADP) me te inorganic phosphate (Pi). Ko tēnei tukanga, e mōhiotia ana ko te chemiosmosis, ko te tihi o te manawa pūtau, e hono ana i te pūngao matū o ngā matūkai ki te mahi pūtau i roto i te ahua o te ATP.
Ētahi atu Tūranga i roto i te Pūnaha Whakapūngao
Haunga te whakaputa ATP, he mahi nui tā ngā mitochondria i roto i ngā ara pākia o te tinana, tae atu ki te huringa waikawa citric (huringa Krebs), te whakahāngaitanga waikawa ngako, me te pākia o te waikawa amino. I roto i te matrix mitochondrial, ka whakaputa te huringa Krebs i ngā kaikawe irahiko NADH me FADH₂, e whāngai ana ki te ETC. Hei tāpiri, ka puta te whakahāngaitanga ngako mā te β-whakahāngaitanga i roto i te mitochondria, e whakarato ana i tētahi atu puna o ngā irahiko kaha-teitei.
Apoptosis me te Tohu
Kei roto i ngā mitochondria te whakahaere i te mate pūtau kua whakaritea (apoptosis). Ka tukuna e rātou te cytochrome c me ētahi atu āhuatanga pro-apoptotic ki roto i te cytosol hei whakautu ki te ahotea pūtau, ki te kino rānei. Mā tēnei tukunga ka whakaoho i te whakahohenga o ngā caspases, e whakarite ana i te wetewete pūnaha o ngā wāhanga pūtau, kia tangohia ai ngā pūtau kua pakaru, kāore rānei e hiahiatia. Heoi anō, ka whai wāhi ngā mitochondria ki ngā ara tohu ā-roto, e pā ana ki ngā urupare pūtau ki te hypoxia, te hanga ROS (tauhohenga momo hāora), me ngā mahi konupūmā.
Te Hanganga o ngā Momo Hāora Tauhohe (ROS)
Ahakoa he mea nui te ETC mō te hanga ATP, ka puta hoki he ROS hei hua taha. Ka taea e ēnei ngota tino tauhohe te kino i ngā wāhanga pūtau mena kāore i te whakahaeretia tika. Kei roto i te Mitochondria ngā pūnaha antioxidant hei whakaiti i te kino o te ROS, hei tiaki i te kounga o te pūtau. He mea whakamīharo, ko ngā taumata iti o te ROS ka taea te mahi hei ngota tohu, hei whakarerekē i ngā tukanga pēnei i te tipu pūtau me te urutau ki te ahotea.
Ngā Ahumahi Mitochondrial
He okana hihiri ngā mitochondria e pakaru tonu ana, e hanumi ana hoki. He mea nui ēnei tukanga hei pupuri i te mahi me te pumau o ngā mitochondria. Mā te wehenga pūtau ka taea te tohatoha o ngā mitochondria, ā, ka āwhina i te tango i ngā mitochondria kua pakaru mā te mitophagy. I tētahi atu taha, ka whakarei ake te hanumi i te mahi mitochondria mā te whakaranu i ngā ihirangi o ngā mitochondria kua pakaru me ngā mea hauora, ka whakaiti i ngā hapa.
Te DNA Mitochondrial me te Tuku Iho
He rerekē ki te DNA karihi, ka tukuna iho te mtDNA mā te whaea, ā, ka whakamārama i ngā wāhanga nui o te pūnaha phosphorylation oxidative. Heoi, ko te nuinga o ngā pūmua mitochondrial ka whakamāramahia e te DNA karihi, ā, ka kawemai ki roto i ngā mitochondria. Ka taea e ngā whakarerekētanga ira i roto i te mtDNA te arahi ki ngā mate mitochondrial, ka pā pinepine ki ngā kiko e hiahiatia ana he nui te pūngao, pērā i ngā uaua me te pūnaha io.
Ngā Pānga ki te Hauora me te Mate
Ko te hiranga o ngā mitochondria ki te whakaputa pūngao pūtau e whakaatu ana i tā rātou whai wāhi ki ngā momo mate. Ko te ngoikore o te mitochondria e pā ana ki ngā mate pāwera, ngā mate neurodegenerative (pēnei i te mate a Parkinson me te mate a Alzheimer), ngā mate cardiovascular, me te koroheketanga.
Nga mate mate
Ko ngā āhuatanga pēnei i te momona me te mate huka momo 2 e pā ana ki te ngoikore o te mahi mitochondrial. Ko te ātete ki te insulin, he tohu o te mate huka momo 2, e pā ana ki te ngoikore o te kaha waikura o te mitochondrial, ka whakararu i te pākia o te huka me ngā lipid.
Nga mate neurodegenerative
Ko te ngoikore o te mitochondrial tetahi o ngā take matua o ngā mate neurodegenerative. Hei tauira, i roto i te mate a Parkinson, ko te ngoikore o te matatini I i roto i te ETC ka arahi ki te pikinga o te ahotea oxidative me te mate neuronal i muri mai. Waihoki, ko te ngoikore o te kaha mitochondrial me ngā tikanga whakahaere kounga ka whai wāhi ki te pathogenesis o te mate a Alzheimer.
Nga Mate Mate Mate
Ka pāngia ngā mate pūnaha toto e te hauora o ngā mitochondria, nā te mea he nui te whakawhirinaki o te ngākau ki te hanga ATP mitochondrial. Ka taea e te ngoikore o te mitochondrial te arahi ki te ngoikore o te ngākau me te whara ischemia-reperfusion nā te korenga o te tuku pūngao me te pikinga o te kino oxidative.
Aging
E pā ana te koroheketanga ki te hekenga o te mahi mitochondrial me te pikinga o te kawenga whakarerekētanga ira i roto i te mtDNA. Ko te hua o tēnei hekenga he hekenga o te hanga ATP me te pikinga o te whakaputanga ROS, ka whai wāhi atu ki te hekenga ā-tinana e kitea ana i te koroheketanga.
Opaniraa
He mea nui ngā mitochondria mō te whakaputa pūngao pūtau, e akiaki ana i ngā tukanga oranga mā te hanga ATP me te whakaurunga pākia. Ko tō rātou āhua hihiri me te whai wāhi ki ngā mahi nui a te pūtau ka nui atu i te koiora anake, ka waiho hei mea nui mō te oranga o te pūtau, te mate, me te tohu. Ko te mārama ki te koiora mitochondria ehara i te mea ka whakamārama noa i ngā tukanga pūtau taketake engari ka hurahia hoki ngā huarahi rongoā mō ngā mate maha e ahu mai ana i te ngoikore o te mitochondria. I te whanaketanga o te pūtaiao, ko te tūhura tonu i ngā mahi mitochondria ka oati ki te whakatuwhera i ngā rohe hou i roto i te rongoā me te matū koiora, ka whakaū i tō rātou mana hei pūngao pūtau e tika ana mō te ora.
