I. Intangiriro
Fosifolipide nicyiciro cya lipide nibintu byingenzi bigize selile.Imiterere yihariye yabo, igizwe numutwe wa hydrophilique hamwe nimirizo ibiri ya hydrophobique, ituma fosifolipide ikora imiterere ya bilayeri, ikora nka bariyeri itandukanya ibiri imbere muri selile nibidukikije.Uruhare rwimiterere ni ngombwa mu gukomeza ubusugire n’imikorere ya selile mu binyabuzima byose.
Ibimenyetso by'utugari n'itumanaho ni inzira zingenzi zituma ingirabuzimafatizo zishobora gukorana hagati yazo n’ibidukikije, bigatuma habaho ibisubizo bihuye nibitera imbaraga zitandukanye.Ingirabuzimafatizo zirashobora kugenzura imikurire, iterambere, nibikorwa byinshi byumubiri binyuze muribwo buryo.Inzira zerekana ibimenyetso bya selile zirimo guhererekanya ibimenyetso, nka hormone cyangwa neurotransmitter, bigaragazwa na reseptors kuri membrane selile, bigatera casade yibintu amaherezo biganisha kumasemburo yihariye.
Gusobanukirwa uruhare rwa fosifolipide mukumenyekanisha no gutumanaho ningirakamaro muguhishura ingorane zukuntu selile zitumanaho kandi zigahuza ibikorwa byazo.Iyi myumvire ifite ingaruka zikomeye mubice bitandukanye, harimo ibinyabuzima ngengabuzima, farumasi, hamwe no guteza imbere imiti igamije indwara nyinshi.Mugucengera muburyo bukomeye hagati ya fosifolipide nibimenyetso bya selile, dushobora kubona ubushishozi mubikorwa byibanze bigenga imyitwarire nimikorere.
II.Imiterere ya Fosifolipide
A. Ibisobanuro byuburyo bwa Fosifolipide:
Fosifolipide ni molekile ya amphipathique, bivuze ko ifite hydrophilique (ikurura amazi) hamwe na hydrophobique (yanga amazi).Imiterere shingiro ya fosifolipide igizwe na molekile ya glycerol ihambiriye iminyururu ibiri ya aside irike hamwe nitsinda ryumutwe wa fosifate.Imirizo ya hydrophobi, igizwe n'iminyururu ya aside irike, ikora imbere imbere ya lipide bilayeri, mugihe imitwe ya hydrophilique ikorana namazi hejuru yimbere ninyuma yinyuma.Iyi gahunda idasanzwe ituma fosifolipide yiteranya ubwayo muri bilayeri, hamwe umurizo wa hydrophobique werekeza imbere imbere hamwe na hydrophilique imitwe ireba ibidukikije byamazi imbere na selile.
B. Uruhare rwa Phospholipid Bilayer muri Membrane:
Fosifolipide bilayeri nikintu gikomeye cyubaka ingirabuzimafatizo, gitanga inzitizi ya kimwe cya kabiri igenzura imigendekere yibintu byinjira muri selile.Uku guhitamo kwingirakamaro ni ngombwa mu kubungabunga ibidukikije byimbere mu ngirabuzimafatizo kandi ni ingenzi cyane nko gufata intungamubiri, kurandura imyanda, no kurinda ibintu byangiza.Kurenga uruhare rwimiterere, bilayeri ya fosifolipide nayo igira uruhare runini mukumenyekanisha no gutumanaho.
Icyitegererezo cyamazi ya mozayike ya selile selile, cyasabwe numuririmbyi na Nicolson mumwaka wa 1972, gishimangira imiterere yimiterere kandi itandukanye, hamwe na fosifolipide ihora ikora kandi proteyine zitandukanye zikwirakwira muri lipide bilayeri.Iyi mikorere ifite akamaro kanini mukworohereza ibimenyetso bya selile no gutumanaho.Kwakira, imiyoboro ya ion, hamwe nizindi poroteyine zerekana byinjijwe muri bilayeri ya fosifolipide kandi ni ngombwa mu kumenya ibimenyetso byo hanze no kubyohereza imbere mu kagari.
Byongeye kandi, ibintu bifatika bya fosifolipide, nkamazi yabyo hamwe nubushobozi bwo gukora imitsi ya lipide, bigira ingaruka kumitunganyirize n'imikorere ya poroteyine za membrane zigira uruhare mukumenyekanisha selile.Imyitwarire yimikorere ya fosifolipide igira ingaruka kubikorwa no kwerekana ibimenyetso bya poroteyine, bityo bikagira ingaruka kumikorere no gukora neza inzira zerekana ibimenyetso.
Gusobanukirwa isano iri hagati ya fosifolipide nimiterere ya selile yimikorere nimikorere bifite ingaruka zikomeye kubikorwa byinshi byibinyabuzima, harimo homeostasis selile, iterambere, nindwara.Kwinjiza ibinyabuzima bya fosifolipide nubushakashatsi bwerekana ibimenyetso bikomeza kwerekana ubushishozi bwimbitse mu itumanaho ry’akagari kandi bitanga amasezerano yo gushyiraho ingamba zo kuvura udushya.
III.Uruhare rwa Fosifolipide mu Kumenyekanisha Akagari
A. Fosifolipide nkibimenyetso bya molekile
Fosifolipide, nkibintu byingenzi bigize utugingo ngengabuzima, byagaragaye nka molekile zerekana ibimenyetso mu itumanaho.Amatsinda ya hydrophilique ya fosifolipide, cyane cyane arimo fosifati ya inositol, akora nk'intumwa za kabiri zikomeye mu nzira zitandukanye zerekana ibimenyetso.Kurugero, phosphatidylinositol 4,5-bisphosifate (PIP2) ikora nka molekile yerekana ibimenyetso byinjizwa muri inositol trisphosphate (IP3) na diacylglycerol (DAG) kugirango isubize imbaraga zidasanzwe.Izi molekile zikomoka kuri lipide zigira uruhare runini mugutunganya urugero rwa calcium yo mu nda no gukora protein kinase C, bityo bigahindura imikorere itandukanye ya selile harimo gukwirakwiza selile, gutandukanya, no kwimuka.
Byongeye kandi, fosifolipide nka aside ya fosifatique (PA) na lysophospholipide yamenyekanye nka molekile yerekana ibimenyetso bigira ingaruka ku buryo butaziguye binyuze mu mikoranire n’intego zihariye za poroteyine.Kurugero, PA ikora nkumuhuza wingenzi mukuzamuka kwingirabuzimafatizo no gukwirakwiza poroteyine zerekana ibimenyetso, mugihe aside lysophosphatidic (LPA) igira uruhare mugutunganya imbaraga za cytoskeletal, kubaho kwakagari, no kwimuka.Inshingano zinyuranye za fosifolipide zigaragaza akamaro kazo mugutegura ama kasike akomeye yerekana ingirabuzimafatizo.
B. Uruhare rwa Fosifolipide mu nzira yo guhererekanya ibimenyetso
Uruhare rwa fosifolipide mu nzira yo guhererekanya ibimenyetso rugaragazwa n’uruhare rwabo rukomeye mu guhindura ibikorwa by’imiti yakira imipaka, cyane cyane iyakira rya poroteyine G (GPCRs).Iyo ligand ihuza GPCRs, fosifolipase C (PLC) irakora, biganisha kuri hydrolysis ya PIP2 no kubyara IP3 na DAG.IP3 itera irekurwa rya calcium mu bubiko bwo mu nda, mu gihe DAG ikora protein kinase C, amaherezo ikarangira igenga imiterere ya gene, imikurire ya selile, hamwe no kwanduza synaptic.
Byongeye kandi, fosifinositide, icyiciro cya fosifolipide, ikora nkibibanza byerekana ibimenyetso bya poroteyine zigira uruhare mu nzira zitandukanye, harimo n’ibigenga icuruzwa ry’imitsi hamwe n’ingufu za actin cytoskeleton.Imikoranire yingirakamaro hagati ya fosifinositide na poroteyine zikorana bigira uruhare mugutondekanya umwanya nigihe gito cyibimenyetso byerekana ibimenyetso, bityo bigahindura ibisubizo byimikorere yibitera imbaraga zidasanzwe.
Uruhare rwibintu byinshi bya fosifolipide mukumenyetso kwakagari no gutambutsa ibimenyetso byerekana inzira zabyo nkibintu byingenzi bigenga homeostasis na selile.
IV.Fosifolipide n'itumanaho ridasanzwe
A. Fosifolipide mu kimenyetso kidasanzwe
Fosifolipide, icyiciro cya lipide irimo itsinda rya fosifate, igira uruhare runini mukumenyekanisha ingirabuzimafatizo, gutunganya inzira zitandukanye za selile binyuze mukugira uruhare mukumenyesha kasake.Urugero rumwe rukomeye ni phosphatidylinositol 4,5-bisphosifate (PIP2), fosifolipide iherereye muri plasma membrane.Mu gusubiza ibibazo bidasanzwe, PIP2 yinjijwe muri inositol trisphosphate (IP3) na diacylglycerol (DAG) na enzyme fosifolipase C (PLC).IP3 itera irekurwa rya calcium mububiko bwimitsi idasanzwe, mugihe DAG ikora protein kinase C, amaherezo igenga imikorere itandukanye ya selile nko gukwirakwiza selile, gutandukanya, no kuvugurura cytoskeletal.
Byongeye kandi, izindi fosifolipide, zirimo aside fosifatique (PA) na lysophospholipide, byagaragaye ko ari ingenzi mu bimenyetso byo mu nda.PA igira uruhare mukugenzura imikurire no gukwirakwizwa no gukora nka poroteyine zitandukanye zerekana ibimenyetso.Acide Lysophosphatidic (LPA) yamenyekanye kubera uruhare rwayo mu guhindura imibereho ya selile, kwimuka, hamwe na cytoskeletal dinamike.Ibyavuye mu bushakashatsi bishimangira uruhare rutandukanye kandi rwingenzi rwa fosifolipide nkibimenyetso bya molekile byerekana selile.
B. Imikoranire ya Fosifolipide na poroteyine na reseptor
Fosifolipide kandi ikorana na poroteyine zitandukanye hamwe niyakira kugirango ihindure inzira yerekana ibimenyetso bya selile.Ikigaragara ni uko fosifinositide, itsinda rya fosifolipide, ikora nk'urubuga rwo kwinjiza no gukora poroteyine zerekana ibimenyetso.Kurugero, phosphatidylinositol 3,4,5-trisphosifate (PIP3) ikora nkigenzura rikomeye ryikura ryikwirakwizwa nogukwirakwiza poroteyine zirimo domine ya pleckstrin homology (PH) kuri plasma membrane, bityo bigatangiza ibintu byerekana ibimenyetso byerekana ibintu.Byongeye kandi, ishyirahamwe ryimikorere ya fosifolipide hamwe na poroteyine zerekana ibimenyetso hamwe na reseptors bituma habaho kugenzura neza ibintu byerekana ibimenyetso muri selile.
Imikoranire inyuranye ya fosifolipide hamwe na poroteyine hamwe na reseptor byerekana uruhare rwabo muguhindura inzira yerekana ibimenyetso byerekana inzira, amaherezo bikagira uruhare mugutunganya imikorere ya selile.
V. Kugena Fosifolipide mu Kumenyekanisha Akagari
A. Enzymes n'inzira zigira uruhare muri Metabolism ya Fosifolipide
Fosifolipide igenzurwa cyane binyuze mumurongo utoroshye wa enzymes n'inzira, bigira ingaruka kubwinshi no mumikorere yabyo.Imwe munzira nk'iyi ikubiyemo guhuza no guhinduranya fosifatiidilinositol (PI) n'ibiyikomokaho bya fosifori, bizwi nka fosifinositide.Phosphatidylinositol 4-kinase na phosphatidylinositol 4-fosifate 5-kinase ni imisemburo itera fosifora ya PI kumwanya wa D4 na D5, ikabyara fosifatiidilinositol 4-fosifate (PI4P) na fosifatidilinositol 4,5-bisphosifate (PIP2).Ibinyuranye, fosifata, nka fosifata na tensin homologi (PTEN), dephosifora fosifinositide, igenga urwego rwabo ningaruka kuri signal ya selile.
Byongeye kandi, de novo synthesis ya fosifolipide, cyane cyane aside fosifatique (PA), ihuzwa na enzymes nka fosifolipase D na diacylglycerol kinase, mugihe iyangirika ryabo riterwa na fosifolipase, harimo na fosifolipase A2 na fosifolipase C. Ibi bikorwa byimisemburo hamwe bigenzura urwego rwimikorere. bioactive lipid mediators, bigira ingaruka kumikorere itandukanye yerekana ibimenyetso kandi bigira uruhare mukubungabunga homeostasis.
B. Ingaruka Zigenga Fosifolipide Kumikorere Yibimenyetso Byakagari
Amabwiriza ya fosifolipide agira ingaruka zikomeye kumikorere yerekana ibimenyetso muguhindura ibikorwa bya molekile zikomeye zerekana inzira.Kurugero, igicuruzwa cya PIP2 na fosifolipase C gitanga inositol trisphosphate (IP3) na diacylglycerol (DAG), biganisha ku kurekura calcium yo mu nda no gukora protein kinase C.Iyi kasike yerekana ibimenyetso bigira ingaruka kumasemburo nka neurotransmission, kugabanuka kw'imitsi, no gukora ingirabuzimafatizo.
Byongeye kandi, impinduka murwego rwa fosifinositide igira ingaruka ku kwinjiza no gukora za poroteyine zikora zirimo lipide-ihuza domeni, bigira ingaruka kuri endocytose, imbaraga za cytoskeletal, no kwimuka kwakagari.Byongeye kandi, kugena urwego rwa PA na fosifolipase na fosifata bigira ingaruka ku icuruzwa rya membrane, gukura kwingirabuzimafatizo, hamwe n'inzira zerekana ibimenyetso bya lipide.
Imikoranire hagati ya metabolisme ya fosifolipide na signal ya selile ishimangira akamaro ko kugenzura fosifolipide mukubungabunga imikorere ya selile no gusubiza ibibazo bidasanzwe.
VI.Umwanzuro
A. Inshamake y'uruhare rw'ingenzi rwa Fosifolipide mu kimenyetso cy'itumanaho no gutumanaho
Muncamake, fosifolipide igira uruhare runini mugutegura ibimenyetso bya selile no gutumanaho muri sisitemu y'ibinyabuzima.Imiterere yabo n'imikorere itandukanye ibafasha gukora nkibintu byinshi bigenzura ibisubizo bya selile, hamwe ninshingano zingenzi zirimo:
Ishirahamwe rya Membrane:
Fosifolipide ikora ibice byingenzi byubaka ingirabuzimafatizo, bigashyiraho urwego rwimiterere yo gutandukanya ibice bigize selile hamwe na proteine zerekana ibimenyetso.Ubushobozi bwabo bwo kubyara lipide microdomain, nka lipide raft, bigira ingaruka kumitunganyirize yimiterere yikimenyetso cyerekana imikoranire yabyo, bigira ingaruka kumikorere no gukora neza.
Ihererekanyabubasha:
Fosifolipide ikora nkumuhuza wingenzi mugukwirakwiza ibimenyetso bidasanzwe mubisubizo bidasanzwe.Fosifinositide ikora nka molekile yerekana ibimenyetso, ihindura ibikorwa bya poroteyine zitandukanye zikora, mugihe aside irike yubusa hamwe na lysophospholipide ikora nkintumwa za kabiri, bigira ingaruka kumikorere ya casade yerekana no kwerekana gene.
Guhindura ibimenyetso by'akagari:
Fosifolipide igira uruhare mu kugena inzira zitandukanye zerekana ibimenyetso, kugenzura imikorere nko gukwirakwiza selile, gutandukanya, apoptose, hamwe n’ibisubizo by’ubudahangarwa.Uruhare rwabo mu kubyara abunzi ba lipide bioactive, harimo eicosanoide na sphingolipide, biragaragaza kandi ingaruka ku miyoboro yerekana ibimenyetso, metabolike, na apoptotique.
Itumanaho hagati:
Fosifolipide kandi igira uruhare mu itumanaho rinyuranye binyuze mu kurekura abunzi ba lipide, nka prostaglandine na leukotriène, ihindura ibikorwa by'utugingo ngengabuzima hamwe na tissue, bigenga umuriro, kumva ububabare, n'imikorere y'amaraso.
Umusanzu utandukanye wa fosifolipide mukumenyesha utugari no gutumanaho bishimangira akamaro kabo mukubungabunga homeostasis selile no guhuza ibisubizo byumubiri.
B. Icyerekezo kizaza cyubushakashatsi kuri Fosifolipide mukumenyetso twa selile
Mugihe uruhare rukomeye rwa fosifolipide mukumenyetso rwakagari rukomeje gushyirwa ahagaragara, inzira nyinshi zishimishije zubushakashatsi buzaza, harimo:
Uburyo butandukanye:
Kwinjizamo tekiniki zisesenguye zisesenguye, nka lipidomics, hamwe na biologiya ya molekuline na selile bizadufasha kurushaho gusobanukirwa ningaruka zigihe gito nigihe gito cya fosifolipide mubikorwa byerekana ibimenyetso.Gucukumbura inzira iri hagati ya metabolisme ya lipide, gucuruza membrane, hamwe na signal ya selile bizagaragaza uburyo bushya bwo kugenzura no kugenzura intego.
Sisitemu Ibinyabuzima Ibitekerezo:
Gukoresha sisitemu ya biologiya inzira, harimo kwerekana imibare no gusesengura urusobe, bizafasha gusobanura ingaruka kwisi yose ya fosifolipide kumiyoboro yerekana ibimenyetso.Kwerekana imikoranire hagati ya fosifolipide, enzymes, hamwe nibimenyetso byerekana ibimenyetso bizasobanura imitungo igaragara hamwe nuburyo bwo gutanga ibitekerezo bigenga inzira yerekana inzira.
Uburyo bwo kuvura:
Iperereza ku kugabanuka kwa fosifolipide mu ndwara, nka kanseri, indwara zifata ubwonko, hamwe na syndromes ya metabolike, bitanga amahirwe yo guteza imbere imiti igamije.Gusobanukirwa uruhare rwa fosifolipide mukuzamuka kwindwara no kumenya ingamba nshya zo guhindura ibikorwa byabo bitanga isezerano ryubuvuzi bwuzuye.
Mu gusoza, ubumenyi bugenda bwiyongera kuri fosifolipide no kugira uruhare rukomeye mu gutangaza ibimenyetso no gutumanaho byerekana imipaka ishimishije yo gukomeza ubushakashatsi n’ingaruka zishobora gusobanurwa mu bice bitandukanye by’ubushakashatsi ku binyabuzima.
Reba:
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Simoni, K., & Vaz, WL (2004).Sisitemu yicyitegererezo, lipid rafts, hamwe na selile.Buri mwaka Isubiramo rya Biofiziki nuburyo bwa Biomolecular, 33, 269-295.
Igihe cyo kohereza: Ukuboza-29-2023
