Cytosol: Gawo Losaoneka la Maselo
Tikamaphunzira za sayansi ya maselo, nthawi zambiri timayang'ana kwambiri pa zinthu zomwe zimaoneka bwino komanso zodziwika bwino, monga nucleus, mitochondria, ndi endoplasmic reticulum. Komabe, mkati mwa selo muli malo ambiri omwe nthawi zambiri saganiziridwa: cytosol. Cytosol ndi madzi ovuta mkati mwa selo komwe njira zofunika kwambiri zamagetsi zimachitika ndipo zinthu zina za maselo zimayandama. M'nkhaniyi, tifufuza za momwe cytosol imagwirira ntchito, ntchito yake mu selo, komanso chifukwa chake ndi yofunika kwambiri pa moyo wa maselo.
Kodi Cytosol ndi chiyani?
Musanapite patsogolo pa zokambiranazi, ndikofunikira kusiyanitsa pakati pa cytosol ndi cytoplasm. Cytosol ndi gawo lamadzimadzi la cytoplasm, kupatula ma organelles ndi kapangidwe ka mkati mwa maselo monga cytoskeleton. Pakadali pano, cytoplasm imaphimba zonse zomwe zili mu selo mkati mwa nembanemba ya plasma, kupatula nucleus. Mwanjira ina, ngati cytoplasm ikayerekezeredwa ndi mzinda, ndiye kuti cytosol ikanakhala misewu ndi malo opezeka anthu ambiri olumikiza nyumbazo.
Cytosol nthawi zambiri ndi madzi, koma ngakhale kuti imatchedwa "maselo amadzimadzi," si madzi oyera. Ili ndi mchere wosungunuka, mamolekyulu achilengedwe, ma ayoni, ndi mapuloteni. Kusasinthasintha kwake kuli ngati gel chifukwa cha kukhalapo kwa ma macromolecules ndi mapuloteni osungunuka, zomwe zimapangitsa kuti ikhale malo abwino kwambiri ochitira zinthu zamagetsi.
Kapangidwe ka Cytosol
Cytosol ndi chisakanizo chovuta cha mamolekyu osiyanasiyana. Pafupifupi 70-80% ya cytosol ndi madzi, omwe amagwira ntchito yofunika kwambiri pakusunga mawonekedwe a selo ndikulola mamolekyu kuyenda ndikuchita zochitika za biochemical. Kuwonjezera pa madzi, cytosol ili ndi:
1. Mapuloteni ndi Ma Enzyme: Mapuloteni ndi gawo lalikulu la cytosol, kuphatikizapo ma enzyme omwe amayambitsa machitidwe osiyanasiyana a kagayidwe kachakudya. Zitsanzo za ma enzyme omwe amapezeka mu cytosol ndi ma enzyme asanu ndi limodzi a njira ya glycolysis, omwe amathandiza kuswa shuga kuti apange mphamvu.
2. Ma Ioni ndi Mchere: Ma Ioni monga potaziyamu, sodium, magnesium, ndi calcium amasungunuka mu cytosol ndipo amachita gawo lowongolera ntchito ya maselo kudzera mukuwongolera kuthekera kwa nembanemba ndi zizindikiro zamaselo.
3. Mamolekyulu a Zachilengedwe: Izi zikuphatikizapo chakudya chosavuta, ma amino acid, ma nucleotide, ndi mafuta. Mamolekyulu achilengedwe awa ndi ofunikira pakupanga ma macromolecular.
4. Zingwe za Cytoskeletal: Ngakhale kuti sizili mbali ya madzi a cytosolic, ulusi wa cytoskeletal umapereka chithandizo cha kapangidwe kake ndi njira zonyamulira mamolekyu ndi ma organelles mkati mwa selo.
Ntchito za Cytosol
Ngakhale kuti nthawi zambiri imanyalanyazidwa, cytosol ili ndi ntchito zosiyanasiyana zofunika:
1. Kumene Kagayidwe kachakudya Kamachitika: Njira zambiri za kagayidwe kachakudya m'maselo, kuphatikizapo glycolysis, zimachitika mu cytosol. Ma enzyme ndi magawo a njirazi amapezeka mu cytosol, ndipo zotsatira za glycolysis ndi pyruvic acid, yomwe ingagwiritsidwe ntchito kwambiri mu mitochondria kuti ipange mphamvu zambiri.
2. Kuyenda kwa Maselo: Cytosol imagwira ntchito ngati njira yomwe mamolekyu ndi ma organelle amatha kuyenda mkati mwa selo. Ma microtubules ndi ma microfilaments a cytoskeleton amapereka njira zotumizira ma vesicles ndi ma organelle mkati mwa cytosol kudzera mu njira zamapuloteni oyendetsa magalimoto monga kinesin ndi dynein.
3. Kulamulira Osmosis ndi Kuchuluka kwa Maselo: Kuchuluka kwa ma ayoni mu cytosol kumakhudza kuthamanga kwa osmotic, zomwe zimakhudzanso kulamulira kuchuluka kwa maselo. Kulamulira kumeneku ndikofunikira kwambiri kuti maselo akhale ndi thanzi labwino komanso kupewa kuchepa kwa maselo chifukwa cha kusintha kwa kuthamanga kwa osmotic.
4. Kutumiza Zizindikiro: Njira zambiri zotumizira zizindikiro zimadalira mapuloteni ndi ma ayoni omwe amasungunuka mu cytosol. Zizindikirozi zimatha kuchokera kunja kwa selo ndikuyambitsa mayankho monga kuchulukana, apoptosis, kapena kusintha kwa kagayidwe kachakudya.
Kusintha kwa Cytosol mu Maselo Osiyanasiyana
Monga zigawo zina zambiri za maselo, kapangidwe ndi ntchito ya cytosol zimatha kusiyana kutengera mtundu wa selo ndi malo omwe ili. Mwachitsanzo, maselo a minofu amafunika kuchuluka kwa calcium ion mu cytosol kuti minofu ichepetseke. Pakadali pano, maselo a zomera ndi mabakiteriya akhoza kukhala ndi zigawo za cytosolic zomwe zimasinthidwa kuti zisunge ndikusintha mphamvu pansi pa nyengo yovuta kwambiri.
Cytosol ngati Cholinga Chofufuzira
Popeza ntchito zazikulu za biochemical zimachitika mu cytosol, sizodabwitsa kuti kafukufuku wofunikira wayang'ana kwambiri pa kuyeza magawo a cytosolic monga pH, kuchuluka kwa ayoni, ndi kukhuthala. Kusintha kumeneku kungayambitse matenda ambiri ndi matenda. Mwachitsanzo, kusagwira bwino ntchito kwa ionic regulation komwe kumachitika chifukwa cha kuwonongeka kwa mapuloteni a nembanemba kungayambitse matenda monga cystic fibrosis.
Mu pharmacology, cytosol ikufufuzidwanso ngati chandamale cha kupanga mankhwala. Mapuloteni omwe ali mu cytosol amatha kukhala ngati chandamale cha mamolekyu a mankhwala ochiritsira, monga ma enzyme enaake omwe amagwira ntchito m'njira za kagayidwe ka maselo a khansa zomwe zitha kulepheretsedwa pochiza khansa.
Mapeto
Cytosol singakhale ndi mapangidwe ambiri odabwitsa monga ma organelle ena, koma imagwira ntchito yofunika kwambiri pakusunga ntchito ya maselo ndi thanzi lawo. Mwa kuthandizira njira zamagetsi, kuwongolera kapangidwe ka mankhwala mkati, komanso kuthandizira kulumikizana pakati pa ziwalo za maselo, cytosol ndi yofunika kwambiri pa moyo wa maselo.
Kuphunzira za cytosol kukupitirirabe kusintha, ndipo ndi kupita patsogolo kwa ukadaulo wa microscopy ndi kusanthula kwa biochemical, tikumvetsetsa kwambiri zovuta za dziko laling'ono lomwe limadzaza malo mkati mwa maselo. Tsogolo la kafukufukuyu likulonjeza kumvetsetsa mozama momwe kusintha kwa cytosol kungakhudzire thanzi, kutithandiza kupeza mayankho atsopano ku zovuta zosiyanasiyana za zamankhwala. M'dziko lokhala ndi kuyamikira kwakukulu kwa zinthu zazing'ono kwambiri zamoyo, cytosol imayimiradi imodzi mwa zinthu "zosaoneka" koma zofunika kwambiri mu sayansi ya maselo.
