Biedrîba "Apvienîba HIV.LV" (ik dienu pl. 9 - 21)
apvieniba@apvienibahiv.lv

 
   
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27.08.2019


Vistara institûta (ASV) profesors Luiss Montaners nolçma uzzinât, kâpçc daïai Puertoriko sekss industrijas darbinieèu ir negatîvs HIV statuss, kaut viòas bieþi maina partnerus un neizmanto prezervatîvus. Eksperts izteica pieòçmumu, ka bieþa spermas iedarbîba rada pârmaiòas makstî, kas savukârt paaugstina imunitâti pret HIV.
Profesors nolçma pierâdît ðo teoriju un veica eksperimentus ar makakas mâtîtçm. Pçc 20 nedçïâm eksperimentâ iesaistîtajâm makakâm un kontroles grupai ievadîja pçrtiíu imûndeficîta vîrusa SIV (radniecîgs HIV) nelielas vaginâlâs devas. Rezultâtâ dzîvnieki par 42% retâk nekâ kontroles dzîvnieki inficçjâs ar ðo slimîbu.
Eksperts atzîmçja, ka sperma paaugstinâja HIV supresçjoðâ faktora CCL5 lîmeni makstî un dzemdes kaklâ, kâ arî izraisîja maksts audu sabiezçðanu.
Eksperti noskaidroja, ka, neraugoties uz to, ka risks tika samazinâts par 42%, tâ joprojâm ir daudz mazâka aizsardzîba, nekâ spçj nodroðinât prezervatîvs.
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Source: Nature Communications | «Repeated semen exposure decreases cervicovaginal SIVmac251 infection in rhesus macaques» | https://www.nature.com/articles/s41467-019-11814-5 |
<... Semen is the vehicle for virion dissemination in the female reproductive tract (FRT) in male-to-female HIV transmission. Recent data suggests that higher frequency semen exposure is associated with activation of anti-HIV mechanisms in HIV negative sex workers. Here, we use a non-human primate (NHP) model to show that repeated vaginal exposure to semen significantly reduces subsequent infection by repeated low-dose vaginal SIVmac251 challenge. Repeated semen exposures result in lower CCR5 expression in circulating CD4+ T-cells, as well as higher expression of Mx1 (in correlation with IFNε expression) and FoxP3 in the cervicovaginal mucosa, and increased infiltration of CD4+ T-cells. Establishing in vivo evidence of competing effects of semen on transmission impacts our basic understanding of what factors may determine HIV infectivity in humans. Our results clearly indicate that repeated semen exposure can profoundly modulate the FRT microenvironment, paradoxically promoting host resistance against HIV acquisition. ...>




 
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