Understanding Replication of HIV

Serial Cervicovaginal exposures with Replication-deficient SIVsm induce higher Dendritic Cell (pDC) and CD4+ T-Cell Infiltrates not associated with prevention but a More Severe SIVmac251 Infection of Rhesus Macaques

Abdulhaqq, Shaheed A.; Martinez, Melween I.; Kang, Guobin; Foulkes, Andrea S.; Rodriguez, Idia V.; Nichols, Stephanie M.; Hunter, Meredith; Sariol, Carlos A.; Ruiz, Lynnette A.; Ross, Brian N.; Yin, Xiangfan; Speicher, David W.; Haase, Ashley T.; Marx, Preston A.; Li, Qinsheng; Kraiselburd, Edmundo N.; Montaner, Luis J.

Published Ahead-of-Print
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Abstract

Objective: Intravaginal exposure to SIV acutely recruits IFN-[alpha] producing plasmacytoid dendritic cells (pDC) and CD4+ T-lymphocyte targets to the endocervix of nonhuman primates. We tested the impact of repeated cervicovaginal exposures to noninfectious, defective SIV particles over 72 hrs on a subsequent cervicovaginal challenge with replication-competent SIV.
Methods: 34 Female Indian Rhesus macaques were given a three-day, twice-daily vaginal exposures to either SIVsmB7, a replication-deficient derivative of SIVsmH3 produced by a CEMX174 cell clone (n=16), or to CEM supernatant controls (n=18). On the fourth day, animals were either euthanized to assess cervicovaginal immune cell infiltration or intravaginally challenged with SIVmac251. Challenged animals were tracked for plasma viral load and CD4 counts and euthanized at 42 days post infection.
Results: At the time of challenge, macaques exposed to SIVsmB7, had higher levels of cervical CD123 pDCs (p=0.032) and CD4+ T-Cells (p=0.036) than those exposed to CEM control. Vaginal tissues showed a significant increase in CD4+ T-Cell infiltrates (p=0.048), and a trend towards increased CD68+ cellular infiltrates. After challenge, 12 SIVsmB7-treated macaques showed 2.5-fold greater daily rate of CD4 decline (p=0.0408), and viral load rise (p=0.0036) as compared to 12 control animals.
Conclusions: Repeated non-productive exposure to viral particles within a short daily timeframe did not protect against infection in spite of pDC recruitment, resulting instead in an accelerated CD4+ T-Cell loss with an increased rate of viral replication.
(C) 2013 by Lippincott Williams & Wilkins

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