Isithombe: Izindlela Zeselula Zokuvimbela Umdlavuza

Izinguqulo ezitholakalayo zalesi sithombe

Amafayela ezithombe atholakalayo ukuze alandwe ngezansi awacindezelwe kakhulu futhi anesisombululo esiphezulu - futhi ngenxa yalokho, ikhwalithi ephezulu - kunezithombe ezifakwe ezihlokweni nasemakhasini akule webhusayithi, ezilungiselelwe kangcono usayizi wefayela ukuze kuncishiswe ukusetshenziswa komkhawulokudonsa.

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Incazelo yesithombe

Lo mfanekiso wesayensi wezemfundo wethula umdwebo onemininingwane futhi ocebile ngokubonakalayo wezindlela zokuvimbela umdlavuza weselula, eziklanyelwe ukuxhumana nezinqubo eziyinkimbinkimbi zezinto eziphilayo ngendlela efinyelelekayo nehehayo. Ukwakheka kuhlelwe ngendlela yokuma kwendawo, okuvumela indlela ngayinye ukuthi ithathe indawo yayo ehlukile ngaphakathi kwendawo yeselula ngenkathi igcina ukugeleza kokulandisa okuhlangene kusuka kwesobunxele kuya kwesokudla. Isihloko esiyinhloko, 'Ukuvimbela Umdlavuza,' sivezwa ngokugqamile phezulu, sisebenza njengesisekelo somqondo wesithombe sonke.

Ngakwesobunxele, inqubo yokulungiswa kwe-DNA iboniswa ngokulandelana kwemicimbi yama-molecule. I-DNA double helix eyonakele, ephawulwe ngombani ophuzi kanye no-'X' obomvu, ifanekisela ukulimala kwezakhi zofuzo okubangelwa ama-mutagen noma imisebe. Ngaphansi kwayo, umucu we-DNA ophelele obhalwe ukuthi 'i-Fixed DNA' ubonisa ukulungiswa okuphumelelayo, ugcizelela ikhono langaphakathi leseli lokulungisa amaphutha ngaphambi kokuba aholele ekuguqulweni okunonya. Lesi sigaba siqokomisa ukubaluleka kwama-enzyme okulungisa kanye namaprotheni okuhlola agcina ubuqotho bezakhi zofuzo.

Eduze kokulungiswa kwe-DNA, indlela yama-antioxidants imelelwa yisihlangu esinophawu lokuhlola oluhlaza, esivimba izinhlobo ze-oxygen ezisebenzayo eziboniswa njengama-molecule abomvu nansomi akhipha izinhlansi. Ilebula ethi 'Neutralize Free Radicals' iqinisa indima yokuvikela yama-antioxidants ekuvimbeleni ukucindezeleka kwe-oxidative, okungalimaza izingxenye zamaseli kanye ne-DNA. Lesi singathekiso esibonakalayo siveza ukuthi ama-antioxidants okudla kanye nawomsuka anikela kanjani ekuvimbeleni umdlavuza ngokuzinzisa ama-free radical kanye nokunciphisa umthwalo wokuguquka kwezakhi zofuzo.

Embindini womfanekiso, ukuqapha amasosha omzimba kuyagqama. Iseli elikhulu elimhlophe lomzimba liboniswa lihlasela iseli lomdlavuza elipinki, likhipha ama-molecule ayingozi aboniswe njengezinhlayiya ezikhazimulayo. Ilebula ethi 'Destroy Cancer Cells' ibamba umongo wokuzivikela kwamasosha omzimba, lapho amangqamuzana abulalayo emvelo kanye nama-lymphocyte e-cytotoxic ebona futhi aqede amangqamuzana angajwayelekile ngaphambi kokuba ande ngokungalawuleki. Ukusebenzisana okunamandla phakathi kweseli lomzimba kanye neseli lomdlavuza kwenziwa ngemininingwane emincane, kugcizelela ukunemba namandla esistimu yokuzivikela ekulondolozeni i-homeostasis yezicubu.

Ngaphansi kwalesi sigameko esiphakathi, i-apoptosis—noma ukufa kweseli okuhleliwe—kuboniswa njengeseli eliqhekeka libe ama-vesicle amancane abhalwe ukuthi ‘Ukufa Kweseli Okuhleliwe.’ Le nqubo iqinisekisa ukuthi amangqamuzana alimele noma angaba nomdlavuza ahlakazwa futhi asuswe ngendlela ehlelekile. Ukubonakaliswa okubonakalayo kwe-apoptosis kugcizelela indima yayo njengendlela yokuphepha, okuvimbela ukuqongelela kwamangqamuzana anephutha angakha izimila.

Ngakwesokunene, ukulawulwa komjikelezo weseli kuboniswa ngezimo ezihlukile zokuhlukaniswa kwamaseli. Phezulu, uphawu olubomvu lwe-'STOP' lumisa amaseli angajwayelekile abhalwe ukuthi 'Stop', olufanekisela ukusebenza kwezindlela zokucindezela isimila njenge-p53. Ngaphansi kwalo, amaseli ahlukanisayo anempilo abhalwe ukuthi 'Healthy Growth' amelela ukwanda okuvamile ngaphansi kwezimo ezilawulwayo. Lokhu kuhlangana kubonisa indlela izindawo zokuhlola namaprotheni alawulayo aqinisekisa ngayo ukukhula okulinganiselayo futhi avimbele ukuhlukana kwamaseli okungalawulwa—uphawu lomdlavuza.

Ngaphezu kwalokho, ukuvikelwa kwe-DNA kubonakala ngaphakathi kwe-nucleus yeseli equkethe imicu ye-DNA eboshwe ngokuqinile ebhalwe ukuthi 'i-Stable DNA,' ezungezwe amaprotheni avikelayo. Lesi sigaba sigcizelela ukuvikelwa kwesakhiwo kanye namakhemikhali okuvikela izinto zofuzo ekulimaleni, okuhlanganisa ukulungiswa kabusha kwe-chromatin kanye nokuzinza kwe-histone. Lo mfanekiso uveza umqondo wokuthi ukwakheka kwamaseli ngokwawo kunegalelo ekuvimbeleni umdlavuza ngokuvikela i-DNA emathonyeni ayingozi.

Ngakwesokudla esingezansi, ukuguga kuboniswa ngeseli elikhulisiwe, elidala elibhalwe ukuthi 'Iseli Lokuguga' kanye nesisho esithi 'Halt Amaseli Alimele.' Le nqubo imelela ukuphela okuhlala njalo kokuhlukana kwamaseli aqongelele umonakalo, okusebenza njengesivikelo semvelo ngokumelene nokukhula kwezicubu. Iseli elikhulile libonakala lingasebenzi kodwa lizinzile, lifanekisela ibhalansi phakathi kokuguga nokuvikelwa.

Iphalethi yombala iyonke ihlanganisa imibala efudumele nepholile ukuze ihlukanise izinqubo zezinto eziphilayo ngenkathi igcina ukuvumelana. Okuluhlaza okwesibhakabhaka okuthambile kanye nophephuli kubusa ingemuva, kuvusa indawo encane kakhulu, kuyilapho okubomvu, okuphuzi, kanye nokuluhlaza kugqamisa izindlela ezisebenzayo. Ukukhanya kuyalingana futhi kucacile, okuqinisekisa ukuthi ingxenye ngayinye enelebula iyabonakala futhi ihlukile ngokubonakalayo.

Ukwakheka kuhlanganisa ukunemba kwesayensi nokucaca kobuciko, okwenza kufaneleke ezintweni zemfundo, izethulo zezokwelapha, kanye nokuxhumana kwezempilo yomphakathi. Indlela ngayinye enelebula—ukulungiswa kwe-DNA, ama-antioxidants, ukuqapha amasosha omzimba, i-apoptosis, ukulawulwa komjikelezo weseli, ukuvikelwa kwe-DNA, kanye nokuguga—ngokubambisana kubonisa uhlelo lokuzivikela olunezinhlangothi eziningi oluvimbela ukukhula komdlavuza. Isithombe asigcini nje ngokwazisa kodwa futhi sikhuthaza ukwazisa ngobunzima kanye nokuqina kokuphila kweseli, okubonisa ukuvimbela njengenqubo esebenzayo, eqhubekayo ngaphakathi kweseli ngalinye.

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