Phagocytes: Khadka Difaaca Koowaad ee Jirka
Phagocytes waa unugyo difaac oo door muhiim ah ka ciyaara habdhiska difaaca jirka ee naasleyda. Magaca "phagocyte" wuxuu ka yimid Giriigga, halkaas oo "phago" macnaheedu yahay "cunto" iyo "cyte" macnaheedu yahay "unug." Sida magacu tilmaamayo, shaqada ugu weyn ee phagocytes waa inay liqaan ama cunaan walxaha shisheeye sida bakteeriyada, fayrasyada, iyo burburka unugyada kale, kuwaas oo markaa la burburiyo. Maqaalkani wuxuu si qoto dheer uga hadli doonaa noocyada, farsamooyinka ficilka, iyo doorka phagocytes ee difaaca jirka.
Noocyada Fagocytes-ka
Phagocytes waxay ka kooban yihiin dhowr nooc oo unugyo ah oo kala duwan, mid walbana door gaar ah ayuu ku leeyahay habdhiska difaaca jirka. Waa kuwan qaar ka mid ah noocyada ugu muhiimsan ee phagocytes:
1. Neutrophils: Nooca ugu badan ee phagocyte-ka ee jirka ku jira, neutrophils waa safka ugu horreeya ee difaaca ka dhanka ah caabuqa. Waxay awood u leeyihiin inay si degdeg ah ugu dhaqaaqaan meelaha cudurka qaba ka dibna ay weeraraan jeermiska iyagoo adeegsanaya phagocytosis.
2. Monocytes iyo Macrophages: Monocytes waa unugyo dhiig oo cad oo ku wareega dhiigga. Marka ay gaaraan unugyada jirka ee u baahan difaac joogto ah, waxay isu beddelaan macrophages. Macrophages waxay leeyihiin awood phagocytic oo weyn waxayna sii jiraan waqti ka dheer neutrophils.
3. Eosinophils iyo Basophils: In kasta oo aysan waxtar u lahayn sida neutrophils ee phagocytosis, eosinophils iyo basophils waxay door muhiim ah ka ciyaaraan la dagaallanka dulinleyda iyo xasaasiyadda. Waxay sii daayaan granules ka kooban enzymes kuwaas oo burburin kara jeermiska.
4. Unugyada Dendritic-ga: Marka laga soo tago inay ku lug leeyihiin phagocytosis-ka, unugyada dendritic-ga waxay sidoo kale u dhaqmaan sidii unugyo soo bandhigaya antigen-ka (APCs). Waxay farsameeyaan jeermiska la liqo waxayna unugyada T-ga u soo bandhigaan antigen-ka, taasoo kicinaysa jawaab celin difaac oo la qabsan karta.
Habka Shaqada ee Phagocyte
Habka phagocytosis wuxuu bilaabmaa marka phagocyte uu aqoonsado oo uu ku xidhmo walxo shisheeye. Aqoonsigan waxaa badanaa dhexdhexaadiya qabtayaasha aqoonsada qaababka molecular-ka ee dusha sare ee cudurada, oo loo yaqaan qaababka molecular-la xiriira pathogen-ka (PAMPs).
1. Kiimotaxis: Unugyada 'phagocytes' waxay u dhaqaaqaan goobta caabuqa ama bararka. Habkan waxaa haga calaamadaha kiimikada ee ay soo saaraan unugyada dhaawacan, jeermiska, ama unugyada kale ee difaaca jirka ee firfircoon.
2. Xidhitaanka iyo Gaadiidka: Marka la gaaro bartilmaameedka, phagocyte-ku wuxuu isku xiraa walaxda iyada oo loo marayo soo-dhoweeyayaal gaar ah oo dusha sare ku yaal. Soo-dhoweeyayaashu waxay aqoonsadaan qaybo gaar ah oo ka mid ah cudur-sidaha ama opsonins (borotiinno calaamad u ah cudur-sidaha phagocytosis).
3. Kordhinta Xuubka iyo Samaynta Fagosome: Xuubka unugyada phagocyte ayaa markaa dabooli doona cudur-sidaha, isagoo samaynaya qaab-dhismeed loo yaqaan phagosome.
4. Isku-darka Lysosomes-ka: Phagosome-ku wuxuu markaa ku milmaa lysosome, kaas oo ka kooban ensaymo dheefshiid. Samayntan cusub waxaa loo yaqaan phagolysosome.
5. Dheefshiidka iyo Burburka: Ensaymada Lysosomal waxay u jajabisaa jeermiska una kala qaybisaa jajabyo yaryar, sidaas darteedna way burburiyaan.
6. Exocytosis: Haraaga walxaha aan la dheefshiidi karin waxaa soo saara phagocytes-ka ka baxsan unugga.
Doorka Phagocytes ee Nidaamka Difaaca Jirka
Unugyada 'phagocytes' waxay door muhiim ah ka ciyaaraan ilaalinta hab-nololeedka jirka iyo ka ilaalinta jirka caabuqa. Waa kuwan qaar ka mid ah shaqooyinka muhiimka ah ee phagocytes:
– Jawaab-bixiyaha Koowaad ee Caabuqa: Iyada oo qayb ka ah jawaabta difaaca jirka ee dabiiciga ah, phagocytes-ku waa safka hore ee si dhakhso ah uga jawaaba caabuqa marka cudur-sidaha uu galo jirka.
– Nidaaminta Jawaabta Difaaca Jirka: Unugyada 'phagocytes' ma dilaan oo keliya jeermiska laakiin waxay sidoo kale la xiriiraan unugyada kale ee difaaca jirka. Waxay sii daayaan cytokines kuwaas oo soo saari kara unugyo difaac oo badan goobta uu cudurku ka jiro oo kordhin kara dhaqdhaqaaqa unugyada kale.
– Soo bandhigidda Antigen-ka: Macrophages-ka iyo unugyada dendritic-ga ayaa door muhiim ah ka ciyaara habaynta iyo soo bandhigidda qaybo ka mid ah jeermiska (antigens) unugyada T, kuwaas oo bilaaba jawaab celinta difaaca jirka ee la qabsiga.
– Ka saarista Unugyada Dhintay: Marka laga soo tago nadiifinta jeermiska, phagocytes-ku waxay sidoo kale mas'uul ka yihiin ka saarista unugyada dhintay ama dhaawacan, iyagoo hubinaya inaysan jirin wax urur ah oo ka mid ah haraaga unugyada oo kicin kara barar.
Fagocytes iyo Cudurada
Iyadoo ay jiraan doorkooda ilaalinta, phagocytes-ka mararka qaarkood waxay gacan ka geysan karaan cudurada. Xaaladaha qaarkood oo phagocytes-ku ay ku lug yeelan karaan horumarinta cudurka waxaa ka mid ah:
– Caabuq Joogto ah: Firfircoonida phagocyte-ka oo sii dheeraata waxay sababi kartaa dhaawac unugyo ah oo horseeda cudurro barar daba-dheeraada sida rheumatoid arthritis iyo atherosclerosis.
– Difaaca jirka oo daciifa: Qaar ka mid ah xanuunada sida cudurka granulomatous-ka ee daba-dheeraada (CGD) waxay ku lug leeyihiin cillad phagocyte ah, taasoo keenta awood la'aan inay si wax ku ool ah ula dagaallanto caabuqa.
– Cudurka Neefsashada: Dhaqdhaqaaq xad dhaaf ah oo ku yimaada macrophages-ka sambabada ayaa gacan ka geysan kara cudurka neef-mareenka ee daran (ARDS).
Gabagabo
Phagocytes-ku waxay door muhiim ah ka ciyaaraan difaaca jirka ee ka dhanka ah khataraha kala duwan ee cudurada keena iyada oo loo marayo habka phagocytosis iyo isdhexgalka kale ee difaaca jirka. Marka la fahmo shaqada iyo habka phagocytes-ka, waxaan ku qiimeyn karnaa sida nidaamka difaaca jirka uu u adag yahay oo isku dubaridan yahay. Cilmi-baaris dheeraad ah oo lagu sameeyo phagocytes-ka iyo sida ay u shaqeeyaan ayaa wadada u xaareysa horumarinta daaweyn waxtar leh oo loogu talagalay cudurrada faafa iyo bararka. Phagocytes-ku, inkastoo ay u muuqdaan kuwo fudud shaqadooda ah inay liqaan oo ay dheefshiidaan walxaha shisheeye, dhab ahaantii waxay door ka ciyaaraan dhinacyo badan oo muhiim ah oo ka mid ah jawaabta difaaca jirka.
