Mosebetsi oa Li-Platelet ho Koaleng Mali
Ho hoama ha mali, kapa ho hoama ha mali, ke ts'ebetso ea bohlokoa ea baeloji e thibelang ho tsoa mali ho feteletseng ka mor'a kotsi ea lisele. Har'a likarolo tse fapaneng tsa sele le limolek'hule tse amehang mosebetsing ona oa bohlokoa ke li-platelet, tse tsejoang hape e le li-thrombocyte. Li-platelet ke likaroloana tse nyane tsa sele tse bōpehileng joaloka disk tse nkiloeng ho megakaryocytes mokong oa masapo. Ho sa tsotellehe boholo ba tsona bo fokolang, likarolo tsena tsa sele li bapala karolo e kholo ho hemostasis - ts'ebetso e emisang ho tsoa mali - 'me li bohlokoa ho lokisoeng ha maqeba le bophelo bo botle ba pelo le methapo ea mali ka kakaretso. Sengoloa sena se hlahloba ts'ebetso e rarahaneng ea li-platelet tse hohoang mali, se hlakisa leeto la tsona ho tloha ho potoloha ha mali ho ea ho thehoeng ha ho hohoa ho tsitsitseng.
Sebopeho sa Platelet le Potoloho ea Bophelo
Leeto la platelet le qala mokong oa masapo, moo megakaryocytes li fetang ts'ebetsong e rarahaneng e bitsoang endomitosis, e lebisang tlhahisong ea li-platelet tse likete ka megakaryocyte. Platelet ka 'ngoe e bophara ba li-micrometer tse 2-3 'me e potoloha maling ka matsatsi a ka bang 7-10 pele e tlosoa ke spleen le sebete.
Li-platelet li na le li-organelle le li-granule tse ngata, tse tlatsitsoeng ka lintho tse hoamang mali, li-enzyme le lintho tse holang. Lera la tsona le khabisitsoe ka li-receptor tse fapaneng tse li nolofalletsang ho sebelisana le lisele tse ling le likarolo tse maling. Litšobotsi tsena li hlomella li-platelet ho arabela ka katleho le ka mokhoa o bonahalang kotsi ea methapo ea mali.
Karolo ea Li-platelet ho Hemostasis
Hemostasis ke ts'ebetso ea mehato e mengata e ka aroloang ka hemostasis ea mantlha (ho thehoa ha platelet plug) le hemostasis ea bobeli (ho matlafatsoa ha platelet plug ka letlooeng la fibrin). Li-platelet li ameha haholo mehatong ena ka bobeli.
1. Hemostasis ea Pele: Sebopeho sa Plug ea Platelet
Ha mothapo oa mali o lemetse, lisele tsa endothelial tse ka har'a mothapo li lokolla limolek'hule tse bontšang matšoao 'me li pepesa subendothelial collagen le tissue factor. Ho pepesehela hona ho sebetsa e le letšoao la mahlomola le ho hohelang liplatelete tse potolohang sebakeng sa kotsi. Mekhoa ea mantlha ea hemostatic e amang liplatelete e kenyelletsa:
– Ho khomarela: Mohato oa pele o kenyelletsa ho khomarela ha li-platelet ho matrix e pepesitsoeng ea subendothelial, haholo-holo collagen. Ho khomarela hona ho tsamaisoa ke von Willebrand factor (vWF), e sebetsang joaloka borokho pakeng tsa glycoprotein Ib-IX-V receptor complex le collagen.
– Ho kenya tshebetsong: Ha di khomaretswe, di-platelet di a kenngwa tshebetsong. Ho kenya tshebetsong hona ho baka phetoho sebopehong sa di-platelet ho tloha meahong e kang disk ho ya dibopehong tse nang le meutlwa, ho eketsa sebaka sa tsona sa bokahodimo. Di-platelet tse kentsweng tshebetsong di lokolla dikahare tsa di-granule tsa tsona, tse kenyeletsang ADP, serotonin, calcium, le thromboxane A2. Dintho tsena di eketsa ho kenngwa tshebetsong ha di-platelet tse potileng mme di bokella di-platelet tse ding sebakeng seo.
– Ho kopana: Li-platelet tse sebetsang li hlahisa receptor ea glycoprotein IIb/IIIa holim'a tsona, e tlamang fibrinogen le vWF, e leng se etsang marokho a lipakeng tsa li-platelet le ho lebisa ho kopaneng ha li-platelet. Ho kopana hona ho fella ka ho thehoa ha plug ea hemostatic ea mantlha, e koalang kotsi ka nakoana.
2. Hemostasis ea Bobeli: Matlafatso ea Plug ea Platelet
Leha polaka ea mantlha ea hemostatic e hlaha kapele, e fokola haholo 'me e hloka ho matlafatsoa ho netefatsa hemostasis e tšoarellang. Hemostasis ea bobeli e kenyelletsa ho kopana ha mali, letoto la liketso tsa enzymatic tse fellang ka ho thehoa ha thrombin. Thrombin ke enzyme e matla e fetolang fibrinogen e qhibilihang hore e be likhoele tsa fibrin tse sa qhibiliheng, tse lohang ka har'a polaka ea platelet, e e matlafatsang. Letlooeng lena la fibrin le tsitsisa lekhopho 'me le etsa hore le be matla khahlanong le matla a ho thiba a phallo ea mali.
Karolo ea Liplatelete ka Nģ'ane ho Hemostasis
Ntle le karolo ea tsona ea mantlha ho hemostasis, li-platelet li ameha lits'ebetsong tse fapaneng tsa 'mele le tsa pathological:
– Pholiso ea Maqeba: Li-platelet li lokolla lintlha tsa kholo tse kang platelet-derived growth factor (PDGF) le transforming growth factor-beta (TGF-β), tse bohlokoa bakeng sa tokiso le tsosoloso ea lisele.
– Ho ruruha: Li-platelet tse sebetsang li ntša li-cytokine le li-chemokine tse hlahisang ho ruruha, tse tlatsetsang karabelong ea ho ruruha. Li boetse li sebelisana le li-leukocyte (lisele tse tšoeu tsa mali), li nolofalletsa ho fallela libakeng tsa ho ruruha kapa kotsi.
– Karabelo ea 'Mele oa ho Sireletsa Lisele: Li-platelet li nka karolo ho itšireletseng ha 'mele ka tlhaho ka ho lemoha likokoana-hloko ka ho toba ka li-toll-like receptors (TLRs) le li-receptor tse ling tsa ho lemoha lipaterone. Li ka ba tsa hapa le ho hlahisa li-antigen liseleng tsa 'mele tsa ho itšireletsa mafung, ka hona tsa koala 'mele oa ho itšireletsa mafung oa tlhaho le o ikamahanyang le maemo.
– Thrombosis le Hemostasis Integration: Le hoja li-platelet li le bohlokoa bakeng sa ho thibela ho tsoa mali, ho se sebetse hantle ha tsona ho ka lebisa maemong a pathological. Ho kengoa tšebetsong ha li-platelet ka bongata le ho bokellana ha tsona ho ka fella ka thrombosis, e leng se lebisang maemong a kang myocardial infarction, stroke, kapa deep vein thrombosis. Ka lehlakoreng le leng, mosebetsi o fosahetseng oa li-platelet kapa tlhahiso ea tsona li fella ka mathata a ho tsoa mali a kang thrombocytopenia.
fihlela qeto e
Ha e le hantle, li-platelet ke libapali tsa bohlokoa haholo ts'ebetsong ea ho hoama ha mali. Ho tloha ho thehoeng ha tsona mokong oa masapo ho isa karolong ea tsona ea maano ho hemostasis ea mantlha le ea bobeli, ke bahlokomeli ba hlokolosi ba botšepehi ba methapo ea mali. Li sebetsa ka potlako le ka katleho ha methapo ea mali e lemetse, li thibela ho tsoa mali le ho qala mekhoa ea ho lokisa. Ho feta moo, mesebetsi ea tsona e fetela ka nģ'ane ho hemostasis, e susumetsa pholiso ea maqeba, ho ruruha, tšireletso ea 'mele le maemo a fapaneng a mafu.
Ho utloisisa mesebetsi e rarahaneng le e nang le mahlakore a mangata ea li-platelet ha ho fane feela ka leseli lits'ebetsong tsa motheo tsa baeloji empa hape ho bula tsela bakeng sa mekhoa e mecha ea phekolo. Mekhoa ea phekolo e reretsoeng e ka fetolang ts'ebetso ea li-platelet e ka fana ka mekhoa e mecha ea ho phekola mathata a ho hoama ha mali, mafu a pelo le methapo ea mali le maemo a ho ruruha. Ha lipatlisiso li ntse li tsoela pele ho senola mathata a baeloji ea li-platelet, lisele tsena tse nyane empa tse matla ntle ho pelaelo li tla lula li le ka pele ho saense ea bongaka.
