Ubuchwepheshe Bezokwelapha Ocwaningweni Lwe-HIV
Ucwaningo lwe-HIV luye lwathuthuka kakhulu selokhu kwatholakala leli gciwane ekuqaleni kwawo-1980. Ubuchwepheshe bezokwelapha buye baba yimbangela yalokhu kuthuthuka—kusukela ekuxilongeni okusheshayo nokunembile ngokwengeziwe kanye nokumapha izakhi zofuzo zegciwane kuya ekuthuthukisweni kwezindlela zokwelapha ezilwa namagciwane (ama-ARV) ezisebenza kahle kakhulu. Namuhla, ubuchwepheshe bezokwelapha abusizi nje kuphela ososayensi ukuqonda ukuthi i-HIV ithelela kanjani umzimba kodwa futhi buvula umnyango wokuvimbela okunamandla kakhulu, futhi esikhathini eside, amasu okwelapha okusebenzayo. Lesi sihloko sihlola ubuchwepheshe bezokwelapha obuyisisekelo ocwaningweni lwe-HIV.
1. Ukuxilongwa kwesimanje: kusukela ekutholakaleni kwama-antibody kuya ekuhlolweni kwama-molecule
Enye yezinto ezibalulekile ezifezwe ekuphenduleni kwe-HIV kube ukuthuthukiswa kwamakhono okuthola igciwane kusenesikhathi. Ezigabeni zokuqala zobhubhane, ukuxilongwa kuncike kakhulu ekutholakaleni kwama-antibody, okuthatha isikhathi ngoba umzimba udinga isikhathi esithile ukuze uthuthukise impendulo yomzimba. Manje, ubuchwepheshe obuhlukahlukene bezokwelapha buvumela ukutholwa okusheshayo ngokuzwela okuphezulu.
Ukuhlolwa kwesizukulwane sesine, isibonelo, kungabona kokubili ama-antibodies kanye ne-p24 antigen, iphrotheni ye-HIV ebonakala ngokushesha ngemva kokutheleleka. Ngaphezu kwalokho, ubuchwepheshe bokuhlola ama-molecule njenge-PCR (polymerase chain reaction) buvumela ukutholakala okuqondile kwezinto zofuzo zegciwane. I-PCR iwusizo kakhulu ekutholeni ukutheleleka ezigabeni zokuqala kakhulu, ukuqapha umthwalo wegciwane (inani legciwane egazini), kanye nokuhlola ukusebenza kahle kokwelashwa ngama-ARV.
Intuthuko yokuxilonga iyabonakala nasekuthuthukisweni kokuhlolwa okusheshayo okungasetshenziswa ezikhungweni zokunakekelwa kwempilo ezinezinsiza ezilinganiselwe. Ngendlela yokunakekela abantu, abantu bangathola imiphumela ngokushesha, kusheshiswe ukwelulekwa, ukudluliselwa, kanye nokwelashwa.
2. Ukulandelana kanye ne-bioinformatics: ukuqonda ukuvela kanye nokwehlukahlukana kwe-HIV
I-HIV yaziwa ngokuba nezinga eliphezulu lokuguquka kwezakhi zofuzo. Lesi sici sivumela igciwane ukuthi lizivumelanise ngokushesha, okuhlanganisa nokuvela kokumelana nemithi. Ubuchwepheshe bokulandelana kwezakhi zofuzo—kokubili ukulandelana kwe-Sanger kanye nokulandelana kwesizukulwane esilandelayo (NGS)—buvumela abacwaningi ukuthi bafunde ukulandelana kwezakhi zofuzo ze-HIV, bahlaziye izinguquko, futhi bahlele ubudlelwano phakathi kwezinhlobo ezahlukene.
Nge-NGS, abacwaningi bangathola inani elincane lamagciwane elingase lingabonakali ngezindlela ezilula kodwa elinamandla okuphenduka libe izinhlobo ezinkulu njengoba ingcindezi yemithi ikhuphuka. Ukulandelana kwedatha kuyasiza nasekuqapheni izifo: ukulandelela amaphethini okudlulisela, ukuhlonza amaqoqo, nokuqonda ukuguquguquka kokuqubuka kwesifo esifundeni.
I-Bioinformatics idlala indima ekucubunguleni lolu lwazi olukhulu. Ama-algorithm asetshenziselwa ukubikezela umthelela wokuguqulwa kwezakhi zofuzo ezakhiweni zamaprotheni egciwane, ukuhlonza izinhloso ezintsha zemithi, kanye nokubonisa ukuthi igciwane livela kanjani ezigulini. Ukuhlanganiswa kwe-NGS kanye ne-bioinformatics manje sekuyisinsika esibalulekile socwaningo lwe-HIV lwanamuhla.
3. Ukukhuliswa kwamaseli kanye namamodeli e-in vitro: ukuhlola izindlela zokutheleleka kanye nabantu abazokwelashwa
Ubuchwepheshe bokukhuliswa kwamaseli buvumela izifundo ezijulile zomjikelezo wokuphila kwe-HIV. Abacwaningi basebenzisa amaseli aqondiwe njenge-CD4+ T lymphocytes noma ama-macrophage ukutadisha ukuthi igciwane linamathela kanjani, lingena kanjani, liphindaphinda kanjani, futhi ligwema kanjani impendulo yomzimba. Ngezinhlelo ze-in vitro, abantu abahlukahlukene abazongenela imithi bangahlolwa ngaphansi kwezimo ezilawulwayo ngaphambi kokungena ezivivinyweni zezilwane noma zemitholampilo.
Ngaphezu kokukhuliswa kwamaseli okuvamile, ubuchwepheshe be-organoid kanye nezinhlelo ze-microfluidic (ngezinye izikhathi ezibizwa ngokuthi ama-organ-on-a-chip) seziqala ukusetshenziswa ukulingisa indawo yezicubu zomuntu ngokoqobo. Lokhu kubalulekile ngoba i-HIV ingaqhubeka ezindaweni ezithile zokugcina izicubu, kufaka phakathi izicubu ze-lymphoid. Amamodeli alingisa kakhulu i-biology yomuntu asiza abacwaningi ukuhlola ukungena kwemithi, izimpendulo zomzimba wendawo, kanye nezici ezithonya ukuqhubeka kwegciwane.
4. Ubuchwepheshe bokuthuthukiswa kwemithi: kusukela ekuhlolweni okuphezulu kuya ekwakhiweni okusekelwe esakhiweni
Ukuthuthukiswa kwama-ARV kungenye yezimpumelelo ezinkulu zobuchwepheshe bezokwelapha. Namuhla, ukwelashwa okuhlanganisiwe kunganciphisa umthwalo wegciwane uye emazingeni angabonakali, kwandise isikhathi sokuphila, futhi kunciphise ingozi yokudluliselwa. Ocwaningweni lwemithi ye-HIV, ukuhlolwa kwe-high-throughput (HTS) kusetshenziswa ukuhlola ngokushesha izinkulungwane kuya ezigidini zamakhemikhali ukuthola izinketho ezivimbela ama-enzyme noma izinqubo ezibalulekile zegciwane.
Ngaphezu kwe-HTS, ukwakheka kwemithi okusekelwe esakhiweni kusebenzisa amasu anjenge-X-ray crystallography, i-NMR, kanye ne-cryo-electron microscopy ukuthola izithombe ezinemininingwane zezimo zamaprotheni e-HIV. Ngalolu lwazi, ososayensi bangakha ama-molecule "afanelana" futhi avimbele ukusebenza kwamaprotheni abalulekile, njenge-reverse transcriptase, i-protease, i-integrase, noma amaprotheni ahilelekile ekungeneni kwegciwane emaseli.
Esinye isiqondiso esibalulekile samanje ukuthuthukiswa kwezindlela zokwelapha ezisebenza isikhathi eside—imithi ejovwayo noma efakwayo esebenza amasonto kuya ezinyangeni. Ubuchwepheshe bokwenza imithi kanye nezinhlelo zokulethwa kwemithi ziyisihluthulelo sokuqinisekisa amazinga azinzile emithi emzimbeni.
5. Ubuchwepheshe be-immunology kanye ne-antibody: ekuvimbeleni okusha kanye nokwelapha
Ngaphezu kwezidakamizwa, ubuchwepheshe bezokwelapha buqhuba izindlela ezisekelwe kumasosha omzimba, njengokuthuthukiswa kwemigomo kanye nama-antibodies e-monoclonal. Ukugxila okukhulu okuyinhloko ama-antibodies aqeda amandla (ama-bNAbs), ama-antibodies angaqeda izinhlobo eziningi ze-HIV. Ama-bNAbs ayafundwa ukuze kuvikelwe (ukuvimbela okungasebenzi) kanye nanjengengxenye yamasu okwelapha ahlanganisiwe.
Ubuchwepheshe bobunjiniyela bama-antibody buvumela ama-antibodies ukuthi alungiselelwe impilo ende, ukuqeda igciwane okunamandla, noma ikhono lokuqoqa amaseli omzimba ukuze abhubhise amaseli athelelekile. Amasu okuhlaziya ama-immunological njenge-flow cytometry kanye nokulandelana kwamaseli elilodwa kusiza ukuhlonza izimpendulo ezisebenzayo zama-immune nokuqonda ukuthi kungani kunzima ukuthi i-HIV ilawulwe yisimiso somzimba sokuzivikela semvelo.
6. Ukuhlela izakhi zofuzo kanye namasu okubhekana “nokwelapha”
Enye yezinselele ezinkulu nge-HIV ukuba khona kwendawo yokugcina efihliwe: igciwane linga "casha" emaseli athile futhi lingaphindaphindi, okwenza kube nzima ngama-ARV ukulihlasela. Lapho ukwelashwa kumisiwe, igciwane lingaphinde livele. Ngakho-ke, ucwaningo lokwelapha lugxile endleleni yokuqeda noma yokulawula le ndawo yokugcina.
Ubuchwepheshe bokuhlela izakhi zofuzo njenge-CRISPR-Cas buyindlela ethokozisayo. Ucwaningo luhlola ukuhlanganiswa kwe-HIV proviral DNA kuzakhi zofuzo zabantu, njenge-CCR5, i-receptor esetshenziswa yi-HIV ukungena emaseli. Ngale kwe-CRISPR, kukhona nobuchwepheshe bokwelapha obusekelwe kwi-RNA kanye "nokukhahlela nokubulala" (ukusebenzisa igciwane elifihliwe bese kubulala amaseli athelelekile) kanye "nokuvinjwa nokukhiywa" (ukukhiywa kwegciwane ukuze lihlale lifihliwe unomphela).
Nakuba kuthembisa, lobu buchwepheshe bubhekene nezinselele ezinkulu: ukuphepha, ukunemba kokuqondisa, ingozi yemiphumela engeyona eyokuqondisa, kanye nobunzima bokuletha uhlelo lokuhlela esicutshini esifanele.
7. Izivivinyo zemitholampilo kanye nokuqapha okuqhutshwa idatha
Ubuchwepheshe bezokwelapha buphinde bushintshe indlela okwenziwa ngayo izivivinyo zemitholampilo. Izindlela zokuqapha umthwalo wegciwane obucayi, ama-biomarker omzimba, kanye nokuhlaziywa kokumelana nemithi kusiza abacwaningi ukuhlola ukusebenza kahle kokungenelela ngesikhathi sangempela. Ngaphezu kwalokho, i-big data kanye nobuhlakani bokwenziwa kusetshenziswa ukuhlonza amaphethini empendulo yokwelapha, ukubikezela ingozi yokwehluleka kokwelashwa, kanye nokuklama amasu okuvimbela asebenza kahle kakhulu kubantu abathile.
Ukuhlanganisa idatha yezokwelapha, ye-genomic, kanye neyokuziphatha kungathuthukisa ukuqonda izici ezithonya impumelelo yokwelashwa, okuhlanganisa ukunamathela, ukusebenzisana kwezidakamizwa, kanye nezinye izifo ezifana nesifo sofuba noma i-hepatitis.
Isiphetho
Ubuchwepheshe bezokwelapha bushintshe ngokuyisisekelo isimo socwaningo lwe-HIV. Kusukela ekuxilongweni okusheshayo okusekelwe ku-antigen kanye ne-PCR, kuya ekuhlolweni kwezakhi zofuzo ezibangelwa amagciwane nge-NGS, kuya ekuthuthukisweni kwemithi nge-HTS kanye nomklamo osekelwe esakhiweni, kuya ekusungulweni kwezakhi zofuzo ezisekelwe ku-immunological njenge-bNAbs kanye nokuhlela izakhi zofuzo okuhlolayo—konke kube negalelo ekuthuthukiseni kakhulu ukulawulwa kwe-HIV uma kuqhathaniswa namashumi eminyaka adlule. Ngenkathi izinselele ezifana nezindawo zokugcina ezifihliwe kanye nokumelana nemithi zisekhona, isiqondiso socwaningo sicacile ngokwengeziwe: izindlela zokwelapha ezifinyeleleka kalula, ukuvimbela okunamandla, kanye namasu okufeza isimo esiqhubekayo sokungabi namagciwane. Esikhathini esizayo, intuthuko kwezobuchwepheshe bezokwelapha izohlala ibalulekile ekuhambiseni umhlaba eduze nomgomo wokuqeda ubhubhane lwe-HIV.
