Indima Yama-Macrophage Esistimu Yokuzivikela Emzimbeni
I-Pendahuluan
Uhlelo lokuzivikela komzimba luyiqoqo lezingxenye eziphilayo ezisebenza ukuvikela umzimba ezifweni nasezifo ezahlukahlukene, kungakhathaliseki ukuthi zibangelwa amagciwane, amabhaktheriya, isikhunta, noma ama-parasites. Phakathi kwamaseli ahlukahlukene ahilelekile ohlelweni lokuzivikela komzimba, ama-macrophage angenye yezingxenye ezibaluleke kakhulu. Ama-macrophage angamaseli amakhulu e-phagocytic anekhono lokugwinya nokubhubhisa amagciwane, kanye nokudlala indima ekuvuvukeni nasekulungiseni izicubu. Lesi sihloko sizochaza ngokujulile indima yama-macrophage ohlelweni lokuzivikela komzimba, okuhlanganisa i-phagocytosis, ukuvezwa kwe-antigen, kanye nokukhiqizwa kwe-cytokine.
Iyini i-Macrophage?
Ama-Macrophage awuhlobo lwamaseli amhlophe egazi asebenza njengama-phagocyte. Avela kuma-monocyte, uhlobo lweseli elingaphambi kwegazi elithuthela ezicutshini zomzimba bese lihlukana libe ama-macrophage. Ama-Macrophage angatholakala cishe kuzo zonke izicubu zomzimba, kanti izinombolo ziyahlukahluka kuye ngezimo kanye nendawo encane ezungezile.
Igama elithi "macrophage" livela kwelesiGriki: "macro" lisho okukhulu kanye nelithi "phage" lisho umuntu odlayo. Njengoba igama lisho, ama-macrophage asebenza "ngokudla" izinhlayiya zangaphandle, amangqamuzana afile, kanye nezinye izinsalela zamaseli, ekhipha izinto ezingaba yingozi ezicutshini zomzimba.
Imisebenzi Eyinhloko Yama-Macrophage
1. I-Phagocytosis:
Umsebenzi oyinhloko wama-macrophage yi-phagocytosis, inqubo yokugwinya nokugaya izinhlayiya zakwamanye amazwe, ama-microorganism, noma udoti wamangqamuzana. Ngemva kokudla izinhlayiya zakwamanye amazwe, ama-macrophage ahlukanisa abe yizingxenye ezincane ezingagaywa futhi zisuswe ngumzimba. Ngale nqubo, ama-macrophage adlala indima ekususeni izicubu zezifo ezibangelwa amagciwane kanye nokugcina indawo ehlanzekile yamangqamuzana.
2. Ukwethulwa kwe-Antigen:
Ngaphezu kokusebenza njengama-phagocyte, ama-macrophage asebenza njengamaseli aveza i-antigen (ama-APC). Ngemva kokudla amagciwane, ama-macrophage acubungula futhi abonise izingcezu ze-antigen ezindaweni zawo zamaseli esebenzisa ama-molecule amakhulu e-histocompatibility complex class II (MHC II). Lawa ma-antigen aboniswayo abe eseqashelwa amaseli e-T-helper, aqala impendulo yokuzivikela komzimba eguquguqukayo, okuhlanganisa nokusebenza kwamaseli e-T namaseli e-B.
3. Ukukhiqizwa kwe-Cytokine:
Ama-macrophage akhiqiza futhi akhulule izinhlobo ezahlukene zama-cytokine, okubonisa ama-molecule adlala indima ekuxhumaneni phakathi kwamangqamuzana omzimba. Ama-cytokine akhiqizwa ama-macrophage afaka phakathi ama-interleukin (ILs), i-tumor necrosis factor (TNF), kanye nama-interferons (IFNs). Lawa ma-cytokine asiza ekulawuleni ukuvuvukala futhi aqondise impendulo yomzimba ekuthelelekeni noma ekulimaleni.
Inqubo ye-Phagocytosis kuma-Macrophage
I-Phagocytosis inqubo eyinkimbinkimbi futhi ehlelekile ehilela izigaba eziningana:
1. I-Chemotaxis:
Ama-Macrophage aya ezindaweni lapho kukhona khona ukutheleleka noma ukuvuvukala ngenxa yezimpawu ze-chemotactic, okungaba yizinto ezibangela ukuvuvukala noma imikhiqizo yamagciwane.
2. Ukubopha kanye Nesingeniso:
Ama-Macrophage asebenzisa ama-receptor athile ukuqaphela nokubopha ama-pathogen noma amaseli alimele. Lawa ma-receptor afaka ama-Pattern Recognition Receptors (ama-PRR), aqaphela ama-Pathogen-Associated Molecular Patterns (ama-PAMP) ebusweni bama-pathogen.
3. Ukucindezeleka:
Ngemva kokuqaphela nokufaka igciwane, i-macrophage ikhiqiza i-pseudopodia ukuze izungeze inhlayiya bese yakha i-phagocytic vesicle ebizwa ngokuthi i-phagosome.
4. Ukuvuthwa Nokuhlanganiswa:
I-phagosome ibe isihlangana ne-lysosome, equkethe ama-enzyme e-hydrolytic kanye nezinto ezilwa namagciwane, yakha i-phagolysosome. Ngaphakathi kwe-phagolysosome, i-pathogen ibhujiswa yindawo enobuthi ne-enzyme enamandla.
5. Ukugaya kanye Nokukhipha Indle:
Izingxenye ze-pathogen ezonakele bese ziyagaywa futhi zisuswe esitokisini, kungaba nge-exocytosis noma ngokwethulwa njengama-antigen ebusweni be-macrophages.
Ukwethulwa kwe-Antigen kanye nokusebenza kwe-T Cell
Ama-macrophage awagcini nje ngokuqeda amagciwane ngokusebenzisa i-phagocytosis kodwa futhi adlala indima ebalulekile ekuqaliseni impendulo yokuzivikela komzimba eguquguqukayo. Ngemva kwe-phagocytosis kanye nokucutshungulwa kwe-pathogen, ama-macrophage aveza izingcezu ze-antigen ezindaweni zawo kusetshenziswa ama-molecule e-MHC II. Lawa ma-molecule e-MHC II aqashelwa ama-receptor eseli lomsizi we-T (CD4+), aqala ukusebenza nokwanda kwamaseli omsizi we-T.
Amaseli e-T-helper asebenzayo abe esesiza ekuhlanganiseni impendulo yokuzivikela yomzimba eqondile neqinile ngokwenza amaseli e-B asebenze ukukhiqiza ama-antibodies kanye namaseli e-T ane-cytotoxic (CD8+) ukuhlasela amaseli athelelekile. Ngakho-ke, ama-macrophage adlala indima ebalulekile ekuhlanganiseni izinhlelo zokuzivikela zomzimba ezizalwa nazo nezizivumelanisa nezimo.
Ukukhishwa kwe-Cytokine kanye nokulamula inqubo yokuvuvukala
Ama-Macrophage nawo adlala indima ekulawuleni nasekuxazululeni izinqubo zokuvuvukala ngokukhiqizwa kwama-cytokine ahlukahlukene. Lawa ma-cytokine afaka:
– I-Interleukin-1 (IL-1): Idlala indima ekwandiseni impendulo yokuvuvukala ngokuvuselela ukuqoqana kwamanye amaseli omzimba endaweni yokutheleleka.
– I-Tumor Necrosis Factor-alpha (TNF-α): Ivuselela impendulo yokuvuvukala futhi ingabangela ukufa kwamangqamuzana athelelekile noma anomdlavuza.
– I-Interleukin-6 (IL-6): Inemiphumela ye-pleiotropic, okuhlanganisa ukukhuthazwa kwezimpendulo zokukhiqizwa kwama-antibody kanye nokuhlukaniswa kwamaseli e-B.
– I-Interferon-gamma (IFN-γ): Isebenza ekwandiseni umsebenzi wokulwa namagciwane wama-macrophage kanye nokuqinisa ukwethulwa kwe-antigen.
Ngokukhiqizwa kanye nokukhiqizwa kwala ma-cytokine, ama-macrophage angalawula indawo yokuvuvukala futhi aqinisekise ukuthi impendulo efanele yomzimba igcinwa phakathi nesikhathi sokutheleleka noma ukuvuvukala.
Ama-Macrophage Kwezifo kanye Nokwelashwa Nge-Immunotherapy
Ukubandakanyeka kwama-macrophage ezimweni ezahlukahlukene zezifo ezifana nokuzivikela komzimba, umdlavuza, kanye nezifo ezingamahlalakhona kugcizelela ukubaluleka kokuqonda izindlela zawo zokusebenza ekuthuthukiseni izindlela zokwelapha ezintsha. Isibonelo, ezifweni zokuzivikela komzimba, ama-macrophage ngezinye izikhathi angadlala indima ekubhubhiseni izicubu zomzimba. Ngakho-ke, ukuqondisa ama-macrophage ngemithi ethile yokwelapha kungasiza ekunciphiseni ukuvuvukala futhi kunciphise izimpawu zezifo zokuzivikela komzimba.
Uma kukhulunywa ngomdlavuza, ama-macrophage aziwa ngokuthi ama-macrophage ahlobene ne-tumor (ama-TAM) avame ukutholakala ezicutshini zesimila futhi angasekela ukukhula kwesimila ngokukhipha izinto ezibangela isimila. Ucwaningo lwakamuva lugxile ekushintsheni umsebenzi wama-TAM kusukela ekusekeleni ukukhula kwesimila kuya ekusizeni amasosha omzimba ukulwa nomdlavuza.
Isiphetho
Ama-macrophage angamaseli abalulekile ohlelweni lokuzivikela komzimba, anezindima ezahlukahlukene kusukela ku-phagocytosis kanye nokwethulwa kwe-antigen kuya ekukhiqizweni kwe-cytokine. Njengoba enekhono lokugwinya nokubhubhisa amagciwane kanye nokuhlanganisa izimpendulo zomzimba eziguquguqukayo, ama-macrophage adlala indima ekugcineni ubuqotho bomzimba kanye nokumelana nezinsongo ezahlukahlukene zamagciwane. Ukuqonda kahle umsebenzi we-macrophage kanye nezindlela akubalulekile kuphela kumongo webhayoloji eyisisekelo kodwa futhi kunemiphumela ebalulekile ekuthuthukisweni kwezindlela zokwelapha izifo ezithathelwanayo, izifo zokuzivikela komzimba, kanye nomdlavuza.
