HIV Research Today is a free monthly online journal that collates and summarizes the latest research about HIV, including details on human immunodeficiency virus, testing, treatment, prevention, vaccines, aids. | ||||||
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Assessment of rapid tests for detection of human immunodeficiency virus-specific antibodies in recently infected individuals.Louie B, Wong E, Klausner JD, Liska S, Hecht F, Dowling T, Obeso M, Phillips SS, Pandori MW San Francisco Department of Public Health, 101 Grove St., Room 412, San Francisco, CA 94102, USA. brian.louie@sfdph.org We have evaluated four current Food and Drug Administration-cleared rapid tests for human immunodeficiency virus (HIV)-specific antibodies with a panel of specimens from recently infected individuals. Recent infection was detected by RNA-based screening coupled with enzyme immunoassay-based testing. We found that the sensitivities of the various rapid tests vary greatly with regard to their ability to detect HIV-specific antibodies in recently infected individuals. Published 4 April 2008 in J Clin Microbiol, 46(4): 1494-7. Articles on HIV published 28 March 2008: The lentiviral integrase binding protein LEDGF/p75 and HIV-1 replication. PLoS Pathog, 4(3): e1000046. Retroviral replication proceeds through a stable proviral DNA intermediate, and numerous host cell factors have been implicated in its formation. In particular, recent results have highlighted an important role for the integrase-interactor lens epithelium-derived growth factor (LEDGF)/p75 in lentiviral integration. Cells engineered to over-express fragments of LEDGF/p75 containing its integrase-binding domain but lacking determinants essential for chromatin association are refractory to HIV-1 ... [Abstract] [Full-text] Transmission of HIV-1 CTL escape variants provides HLA-mismatched recipients with a survival advantage. PLoS Pathog, 4(3): e1000033. One of the most important genetic factors known to affect the rate of disease progression in HIV-infected individuals is the genotype at the Class I Human Leukocyte Antigen (HLA) locus, which determines the HIV peptides targeted by cytotoxic T-lymphocytes (CTLs). Individuals with HLA-B*57 or B*5801 alleles, for example, target functionally important parts of the Gag protein. Mutants that escape these CTL responses may have lower fitness than the wild-type and can be associated with slower ... [Abstract] [Full-text] Articles on HIV published 27 March 2008: Episodic sexual transmission of HIV revealed by molecular phylodynamics. PLoS Med, 5(3): e50. BACKGROUND: The structure of sexual contact networks plays a key role in the epidemiology of sexually transmitted infections, and their reconstruction from interview data has provided valuable insights into the spread of infection. For HIV, the long period of infectivity has made the interpretation of contact networks more difficult, and major discrepancies have been observed between the contact network and the transmission network revealed by viral phylogenetics. The high rate of HIV evolution ... [Abstract] [Full-text] Articles on HIV published 26 March 2008: Negative and positive mRNA splicing elements act competitively to regulate human immunodeficiency virus type 1 vif gene expression. J Virol, 82(8): 3921-31. Over 40 different human immunodeficiency virus type 1 (HIV-1) mRNAs are produced by alternative splicing of the primary HIV-1 RNA transcripts. In addition, approximately half of the viral RNA remains unspliced and is used as genomic RNA and as mRNA for the Gag and Pol gene products. Regulation of splicing at the HIV-1 3' splice sites (3'ss) requires suboptimal polypyrimidine tracts, and positive or negative regulation occurs through the binding of cellular factors to cis-acting splicing ... [Abstract] [Full-text] Two amino acid substitutions within the first external loop of CCR5 induce human immunodeficiency virus-blocking antibodies in mice and chickens. J Virol, 82(8): 4125-34. Antibodies to the first loop (ECL1) of CCR5 have been identified in human immunodeficiency virus (HIV)-exposed uninfected individuals (ESN) and in HIV-positive nonprogressing subjects. Thus, these antibodies may confer resistance against HIV infection. To define which amino acids are involved in antibody binding to CCR5, we performed a peptide-scanning assay and studied the immunogenicity of peptides in animal models. A panel of synthetic peptides spanning the CCR5-ECL1 region and displaying ... [Abstract] [Full-text] Modulation of beta-catenin and E-cadherin interaction by Vpu increases human immunodeficiency virus type 1 particle release. J Virol, 82(8): 3932-8. Vpu (viral protein U) is a 17-kDa human immunodeficiency virus type 1 (HIV-1) accessory protein that enhances the release of particles from the surfaces of infected cells. Vpu recruits beta-transducin repeat-containing protein (beta-TrCP) and mediates proteasomal degradation of CD4. By sequestering beta-TrCP away from other cellular substrates, Vpu leads to the stabilization of beta-TrCP substrates such as beta-catenin, IkappaBalpha, ATF4, and Cdc25A, but not of other substrates such as Emi1. ... [Abstract] [Full-text] Human immunodeficiency virus viremia induces plasmacytoid dendritic cell activation in vivo and diminished alpha interferon production in vitro. J Virol, 82(8): 3997-4006. Human immunodeficiency virus type 1 (HIV-1) infection has been associated with perturbations of plasmacytoid dendritic cells (PDC), including diminished frequencies in the peripheral blood and reduced production of type I interferons (IFNs) in response to in vitro stimulation. However, recent data suggest a paradoxical increase in production of type 1 interferons in vivo in HIV-infected patients compared to uninfected controls. Using a flow cytometric assay to detect IFN-alpha-producing cells ... [Abstract] [Full-text] Deciphering human immunodeficiency virus type 1 transmission and early envelope diversification by single-genome amplification and sequencing. J Virol, 82(8): 3952-70. Accurate identification of the transmitted virus and sequences evolving from it could be instrumental in elucidating the transmission of human immunodeficiency virus type 1 (HIV-1) and in developing vaccines, drugs, or microbicides to prevent infection. Here we describe an experimental approach to analyze HIV-1 env genes as intact genetic units amplified from plasma virion RNA by single-genome amplification (SGA), followed by direct sequencing of uncloned DNA amplicons. We show that this ... [Abstract] [Full-text] © 2004-2008 HIV Research Today. All Rights Reserved. |
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