scholarly journals Assessment of a new "DS-EIA-HIV-AB-TERM" assay to determine the probable time of infection with human immunodeficiency virus-1 (HIV-1)

2015 ◽  
Vol 20 (3) ◽  
pp. 23-27
Author(s):  
Yu. E Zagryadskaya ◽  
D. A Neshumaev ◽  
Yu. A Kokotyukha ◽  
E. M Meyrmanova ◽  
I. A Olkhovskiy ◽  
...  
Keyword(s):  
Human Immunodeficiency Virus ◽  
Hiv Infection ◽  
Population Level ◽  
Test System ◽  
Serum Samples ◽  
Immunodeficiency Virus ◽  
Time Of Infection ◽  
Hiv 1 ◽  
Probable Time

The epidemiological situation for HIV infection in Russia remains to be extremely stringent, which requires a search for new, more efficient and cost-effective solutions aimed at countering the epidemic. The inclusion of laboratory studies with the use of a test system for the determination of the remoteness of HIV infection in routine surveillance practices will permit to determine the frequency of occurrence of early cases of infections among newly diagnosed HIV-positive persons. The analysis of this criterion at the population level will help to objectively evaluate the effectiveness of prevention, control activities carried out in a particular area. The increase of objectivity in the determination of the time elapsed from the moment of infection of HIV-1 with the use of the test system DSEIA-HIV-Ab-TERM provides the opportunity to use the obtained results in the epidemiological investigation for the purpose of more accurate and complete identification of contact persons. The determination of the probable period of infection may also be required in the solving the question on the prescription of antiretroviral therapy as a complementary study in the monitoring of HIV drug resistance. The aim of this work was to determine the effectiveness of the new test system DS-EIAHIV-Ab-TERM for the determination of the likely timing of HIV-1 infection. There were studied serum samples (plasma) of blood of HIV-infected persons with epidemiologically established time of infection (n = 281) and samples of commercial seroconversion panels. Results of the performed study showed that the probability of a correct detection of the remoteness of HIV-1 infection for samples from individuals with the most probable time of the established fact of infection was 95%, for samples of commercial seroconversion panels - 100%. The data demonstrated the high efficacy of the test system DS-“EIAHIV-Ab-TERM” in the determination of the most probable timing of infection with human immunodeficiency virus type 1, that in combination with the speed and simplicity of the procedure allows to recommend it for use in the laboratory practice.

scholarly journals Interleukin 7 Increases Human Immunodeficiency Virus Type 1 LAI-Mediated Fas-Induced T-Cell Death

2005 ◽  
Vol 79 (5) ◽  
pp. 3195-3199 ◽  
Author(s):  
Jean-Daniel Lelièvre ◽  
Frédéric Petit ◽  
Damien Arnoult ◽  
Jean-Claude Ameisen ◽  
Jérôme Estaquier
Keyword(s):  
Human Immunodeficiency Virus ◽  
T Cells ◽  
Cell Death ◽  
T Cell ◽  
Hiv Infection ◽  
Cell Infection ◽  
Interleukin 7 ◽  
Immunodeficiency Virus ◽  
Hiv 1

ABSTRACT Fas-mediated T-cell death is known to occur during human immunodeficiency virus (HIV) infection. In this study, we found that HIV type 1 LAI (HIV-1LAI) primes CD8+ T cells from healthy donors for apoptosis, which occurs after Fas ligation. This effect is counteracted by a broad caspase inhibitor (zVAD-fmk). Fas-mediated cell death does not depend on CD8+ T-cell infection, because it occurred in the presence of reverse transcriptase inhibitors. However, purified CD8+ T cells are sensitive to Fas only in the presence of soluble CD4. Finally, we found that interleukin 7 (IL-7) increases Fas-mediated CD4+ and CD8+ T-cell death induced by HIV-1LAI. Since high levels of IL-7 are a marker of poor prognosis during HIV infection, our data suggest that enhancement of Fas-mediated T-cell death by HIV-1LAI and IL-7 is one of the mechanisms involved in progression to AIDS.

scholarly journals Predictive value of anti-cell and anti-human immunodeficiency virus (HIV) humoral responses in HIV-1-exposed seronegative cohorts of European and Asian origin

2005 ◽  
Vol 86 (2) ◽  
pp. 339-348 ◽  
Author(s):  
L. Lopalco ◽  
C. Barassi ◽  
C. Paolucci ◽  
D. Breda ◽  
D. Brunelli ◽  
...  
Keyword(s):  
Human Immunodeficiency Virus ◽  
Immune Responses ◽  
Serum Samples ◽  
Predictive Values ◽  
Asian Populations ◽  
Immunodeficiency Virus ◽  
Hiv Exposure ◽  
Route Of Exposure ◽  
Humoral Responses ◽  
Hiv 1

Unconventional immune responses have been demonstrated in individuals who, despite repeated exposure to human immunodeficiency virus (HIV) infection, remain seronegative. As environmental exposure to pathogens and genetic background may modulate immune responses differentially, one Italian and two Asian populations of HIV-1-exposed seronegative individuals were studied. In serum samples from each group, IgG to CCR5, IgG to CD4 and IgA to gp41 were measured, which were previously described as markers of unconventional immunity in HIV-exposed seronegative Caucasians. Given the importance of conformational epitopes in virus–cell interactions, IgG to CD4–gp120 complex was also measured. It was found that markers of HIV exposure were present in all populations studied. HIV-specific humoral responses (IgA to gp41 and IgG to CD4–gp120 complex) were extremely significant predictors of HIV exposure (P<0·0001 in both cases), whereas the predictive values of anti-cell antibodies (anti-CCR5 and anti-CD4) varied between populations. Evidence is provided for the correlation of these differences with route of exposure to HIV and level of natural antibodies to cross-reactive microbial antigens. In conclusion, exposed seronegative individuals of ethnically different origins display similar signs of HIV-dependent unconventional immunity. A specific relevance must be attributed to different innate and acquired factors.

Late diagnosis of human immunodeficiency virus infections in high-risk groups in Karachi, Pakistan

2018 ◽  
Vol 29 (14) ◽  
pp. 1400-1406
Author(s):  
Zahra Hasan ◽  
Sharaf Shah ◽  
Rumina Hasan ◽  
Shoaib Rao ◽  
Manzoor Ahmed ◽  
...  
Keyword(s):  
Human Immunodeficiency Virus ◽  
High Risk ◽  
Early Diagnosis ◽  
Hiv Infection ◽  
Hiv Infections ◽  
Risk Groups ◽  
Newly Diagnosed ◽  
Immunodeficiency Virus ◽  
Hiv 1

Human immunodeficiency virus (HIV) infection prevalence in Pakistan has been increasing in high-risk groups, including people who inject drugs (PWID) and transgender hijra sex workers (TG-HSWs) nationwide. Effective control of HIV requires early diagnosis of the infection. We investigated recency of HIV infections in newly-diagnosed cases in PWID and TG-HSWs. This was an observational study with convenience sampling. Overall, 210 HIV-positive subjects comprising an equal number of PWID and TG-HSWs were included. Antibody avidity was tested using the Maxim HIV-1 Limiting Antigen Avidity (LAg) EIA (Maxim Biomedical, Inc. Rockville, Maryland, USA). The mean age of study subjects was 29.5 years: PWID, 28.5 years and TG-HSWs, 30.4 years. Study subjects were married, 27%, or unmarried. Eighteen percent of individuals had recently-acquired HIV infections: 19% of PWID and 17% of TG-HSWs. Eighty-two percent of individuals had long-term HIV infections: 81% of PWID and 83% of TG-HSWs. This is the first study identification of recent HIV-1 infections in Pakistan. We show that most newly-diagnosed HIV patients in the high-risk groups studied had long-term infections. There is an urgent need for intervention in these groups to facilitate early diagnosis and treatment of HIV infection to reduce transmission in Pakistan.

scholarly journals 1265. Monitoring of Human Immunodeficiency Virus (HIV)-Infection Using the Cepheid HIV-1 Qualitative Assay

2019 ◽  
Vol 6 (Supplement_2) ◽  
pp. S455-S455
Author(s):  
Erin Keizur ◽  
Drew Wood-Palmer ◽  
Maryann Koussa ◽  
Manuel Ocasio ◽  
Mary Jane Rotheram-Borus ◽  
...  
Keyword(s):  
Human Immunodeficiency Virus ◽  
Los Angeles ◽  
Hiv Infection ◽  
Whole Blood ◽  
Viral Rna ◽  
Hiv Rna ◽  
Hiv Dna ◽  
Immunodeficiency Virus ◽  
Hiv 1 ◽  
Pcr Test

Abstract Background Human immunodeficiency virus (HIV)-1 RNA quantification is the primary method of monitoring response to antiretroviral therapy. In the U.S. viral RNA testing is recommended for all HIV-infected patients at entry into care, at initiation or modification of therapy, and on a regular basis thereafter. HIV-1 DNA testing may pose additional advantages. For example, proviral DNA may predict early loss of viral suppression. The Cepheid® (Sunnyvale, CA) HIV-1 Qualitative (HIV Qual) assay detects total nucleic acid for both RNA and DNA and provides a qualitative result (HIV detectable or undetectable). Methods We tested participants aged 14–24 years old from the Adolescent Trials Network (ATN) CARES study with known HIV infection in Los Angeles, California and New Orleans, Louisiana. We tested participants using the Cepheid® HIV Qual assay and the quantitative HIV-1 RNA, real-time PCR test using the COBAS P6800 system (Roche, Branchburg, NJ). We used 100 μL of whole blood for the HIV Qual assay and results were provided in 90 minutes. We sent the remainder of the whole blood from the same visit to a commercial laboratory for HIV-RNA PCR testing and results were reported as “detected,” “detected, <20 copies/mL plasma” or “not detected, <20 copies/mL plasma.” We compared HIV Qual and HIV RNA PCR test results from the same visit for each participant. Results Overall, 57 HIV Qual tests were performed with concurrent HIV RNA PCR tests. Of those, 9/15 tests were concordant with HIV viral RNA suppression while 39/42 tests were concordant with HIV viral RNA detection. In 6 cases, the HIV RNA was not detected at <20 copies/mL by the Roche PCR while the HIV Qual assay detected HIV DNA. Of those 6 cases, 3 had subsequent HIV RNA PCR testing. All 3 cases had detectable HIV RNA at their next testing date (214 copies/mL, detected <20 copies/mL, 2130 copies/mL). Conclusion The HIV Qual test is feasible for the monitoring of HIV-infection. Due to its detection of HIV DNA, it may predict future lack of HIV RNA suppression. Disclosures All authors: No reported disclosures.

scholarly journals Human immunodeficiency virus type 1 drug susceptibility determination by using recombinant viruses generated from patient sera tested in a cell-killing assay.

1996 ◽  
Vol 40 (10) ◽  
pp. 2404-2409 ◽  
Author(s):  
C A Boucher ◽  
W Keulen ◽  
T van Bommel ◽  
M Nijhuis ◽  
D de Jong ◽  
...  
Keyword(s):  
Amino Acids ◽  
Human Immunodeficiency Virus ◽  
Human Immunodeficiency Virus Type ◽  
Reference Strain ◽  
Drug Susceptibility ◽  
Recombinant Viruses ◽  
Immunodeficiency Virus ◽  
Hiv 1

A simple approach for the determination of drug susceptibilities by using human immunodeficiency virus type 1 (HIV-1) RNA from the sera of patients is described. HIV-1 RNA was extracted from patient sera, and the 5' part of the reverse transcriptase (RT) gene was transcribed into DNA and amplified in a nested PCR. The amplified fragment covers the 3' part of the protease gene and amino acids 1 to 304 of the RT gene. This fragment can be introduced through homologous recombination, as described previously, into a novel HIV-1 reference strain (pHXB2 delta 2-261RT) from which amino acids 2 to 261 of RT have been deleted. The resulting recombinant virus expresses all properties of the HXB2 reference strain except for those encoded by the introduced part of the patient RT gene. Recombinant viruses were subsequently tested for drug susceptibility in a microtiter format killing assay [3-(4,5-dimethylthiazol-2-yl)-2, 5-diphenyltetrazolium bromide assay] as well as in the standard HeLa CD4+ plaque reduction assay. Similar susceptibility profiles were obtained by each assay with recombinant viruses derived from patients receiving alternating nevirapine and zidovudine treatment or lamivudine-zidovudine combination therapy. In conclusion, this approach enables high-through-put determination of the drug susceptibilities of serum RNA-derived RT genes, independent of the patient's viral background, and generates the possibility of relating changes in susceptibility to changes in viral genotypes.

Human Immunodeficiency Virus (HIV)-Resistant CD4+ UT-7 Megakaryocytic Human Cell Line Becomes Highly HIV-1 and HIV-2 Susceptible Upon CXCR4 Transfection: Induction of Cell Differentiation by HIV-1 Infection

Blood ◽  
1997 ◽  
Vol 89 (8) ◽  
pp. 2670-2678 ◽  
Author(s):  
Marta Baiocchi ◽  
Eleonora Olivetta ◽  
Cristiana Chelucci ◽  
Anna Claudia Santarcangelo ◽  
Roberta Bona ◽  
...  
Keyword(s):  
Human Immunodeficiency Virus ◽  
Hiv Infection ◽  
Cell Line ◽  
Viral Entry ◽  
Human Cell Line ◽  
Immunodeficiency Virus ◽  
Hiv Entry ◽  
Stromal Cell Derived Factor ◽  
Hiv 1

Abstract Recent findings have shown that the expression of the seven trans-membrane G-protein–coupled CXCR4 (the receptor for the stromal cell-derived factor [SDF]-1 chemokine) is necessary for the entry of T-lymphotropic human immunodeficiency virus (HIV) strains, acting as a coreceptor of the CD4 molecule. In the human system, the role of CXCR4 in HIV infection has been determined through env-mediated cell fusion assays and confirmed by blocking viral entry in CD4+/CXCR4+ cells by SDF-1 pretreatment. We observed that the human megakaryoblastic CD4+ UT-7 cell line fails to express CXCR4 RNA and is fully resistant to HIV entry. Transfection of an expression vector containing the CXCR4 c-DNA rendered UT-7 cells readily infectable by different T-lymphotropic syncytium-inducing HIV-1 and HIV-2 isolates. Interestingly, HIV-1 infection of CXCR4 expressing UT-7 cells (named UT-7/fus) induces the formation of polynucleated cells through a process highly reminiscent of megakaryocytic differentiation and maturation. On the contrary, no morphologic changes were observed in HIV-2–infected UT-7/fus cells. These findings further strengthen the role of CXCR4 as a molecule necessary for the replication of T-lymphotropic HIV-1 and HIV-2 isolates and provide a useful model to study the functional role of CD4 coreceptors in HIV infection.

scholarly journals Human immunodeficiency virus (HIV) infection in CD4+ T lymphocytes genetically deficient in LFA-1: LFA-1 is required for HIV-mediated cell fusion but not for viral transmission.

1991 ◽  
Vol 173 (2) ◽  
pp. 511-514 ◽  
Author(s):  
G Pantaleo ◽  
L Butini ◽  
C Graziosi ◽  
G Poli ◽  
S M Schnittman ◽  
...  
Keyword(s):  
Human Immunodeficiency Virus ◽  
T Lymphocytes ◽  
Hiv Infection ◽  
Cell Fusion ◽  
Leukocyte Adhesion ◽  
Leukocyte Adhesion Deficiency ◽  
Immunodeficiency Virus ◽  
Syncytia Formation ◽  
Hiv 1

In the present study, we demonstrated that expression of the LFA-1 molecule is necessary for cell fusion and syncytia formation in human immunodeficiency virus (HIV)-infected CD4+ T lymphocytes. In contrast, the lack of expression of LFA-1 does not influence significantly cell-to-cell transmission of HIV. In fact, LFA-1- T lymphocytes obtained from a leukocyte adhesion deficiency patient were unable to fuse and form syncytia when infected with HIV-1 or HIV-2, despite the fact that efficiency of HIV infection (i.e., virus entry, HIV spreading, and levels of virus replication) was comparable with that observed in LFA-1+ T lymphocytes. In addition, we provide evidence that LFA-1 by mediating cell fusion contributes to the depletion of HIV-infected CD4+ T lymphocytes in vitro.

Cutaneous manifestations of HIV-1 infection

1995 ◽  
Vol 85 (7) ◽  
pp. 362-374 ◽  
Author(s):  
O Memar ◽  
R Cirelli ◽  
P Lee ◽  
SK Tyring
Keyword(s):  
Human Immunodeficiency Virus ◽  
Immune System ◽  
Virus Infection ◽  
Hiv Infection ◽  
Cutaneous Manifestations ◽  
Immunodeficiency Virus ◽  
The Status ◽  
History Of ◽  
Hiv 1

Infection with the human immunodeficiency virus (HIV) leads to a chronic disarmament of the immune system. The process is progressive, having different manifestations as the status of the immune system slowly deteriorates. Some of the most common manifestations of HIV infection are cutaneous in origin, and they can have infectious, neoplastic, or noninfectious or non-neoplastic etiologies. A brief history of HIV is given, and the most common cutaneous presentations of the virus infection of interest to podiatrists are outlined.

scholarly journals Differential Incorporation of CD45, CD80 (B7-1), CD86 (B7-2), and Major Histocompatibility Complex Class I and II Molecules into Human Immunodeficiency Virus Type 1 Virions and Microvesicles: Implications for Viral Pathogenesis and Immune Regulation

2001 ◽  
Vol 75 (13) ◽  
pp. 6173-6182 ◽  
Author(s):  
Mark T. Esser ◽  
David R. Graham ◽  
Lori V. Coren ◽  
Charles M. Trubey ◽  
Julian W. Bess ◽  
...  
Keyword(s):  
Human Immunodeficiency Virus ◽  
T Cells ◽  
Hiv Infection ◽  
Host Cell ◽  
Mhc Ii ◽  
Host Cell Proteins ◽  
Histocompatibility Complex ◽  
Immunodeficiency Virus ◽  
Hiv 1

ABSTRACT Human immunodeficiency virus (HIV) infection results in a functional impairment of CD4+ T cells long before a quantitative decline in circulating CD4+ T cells is evident. The mechanism(s) responsible for this functional unresponsiveness and eventual depletion of CD4+ T cells remains unclear. Both direct effects of cytopathic infection of CD4+ cells and indirect effects in which uninfected “bystander” cells are functionally compromised or killed have been implicated as contributing to the immunopathogenesis of HIV infection. Because T-cell receptor engagement of major histocompatibility complex (MHC) molecules in the absence of costimulation mediated via CD28 binding to CD80 (B7-1) or CD86 (B7-2) can lead to anergy or apoptosis, we determined whether HIV type 1 (HIV-1) virions incorporated MHC class I (MHC-I), MHC-II, CD80, or CD86. Microvesicles produced from matched uninfected cells were also evaluated. HIV infection increased MHC-II expression on T- and B-cell lines, macrophages, and peripheral blood mononclear cells (PBMC) but did not significantly alter the expression of CD80 or CD86. HIV virions derived from all MHC-II-positive cell types incorporated high levels of MHC-II, and both virions and microvesicles preferentially incorporated CD86 compared to CD80. CD45, expressed at high levels on cells, was identified as a protein present at high levels on microvesicles but was not detected on HIV-1 virions. Virion-associated, host cell-derived molecules impacted the ability of noninfectious HIV virions to trigger death in freshly isolated PBMC. These results demonstrate the preferential incorporation or exclusion of host cell proteins by budding HIV-1 virions and suggest that host cell proteins present on HIV-1 virions may contribute to the overall pathogenesis of HIV-1 infection.

scholarly journals Stable expression of transdominant Rev protein in human T cells inhibits human immunodeficiency virus replication.

1992 ◽  
Vol 176 (4) ◽  
pp. 1197-1201 ◽  
Author(s):  
M H Malim ◽  
W W Freimuth ◽  
J Liu ◽  
T J Boyle ◽  
H K Lyerly ◽  
...  
Keyword(s):  
Human Immunodeficiency Virus ◽  
T Cell ◽  
Hiv Infection ◽  
Viral Replication ◽  
Cell Lines ◽  
Cell Function ◽  
T Cell Function ◽  
Immunodeficiency Virus ◽  
Hiv 1 ◽  
Rev Protein

The human immunodeficiency virus (HIV) Rev protein is essential for viral structural protein expression (Gag, Pol, and Env) and, hence, for viral replication. In transient transfection assays, mutant forms of Rev have been identified that inhibit wild-type Rev activity and therefore suppress viral replication. To determine whether such transdominant Rev proteins could provide long-term protection against HIV infection without affecting T cell function, T leukemia cell lines were stably transduced with a retroviral vector encoding a transdominant mutant of the Rev protein, M10. While all the M10-expressing cell lines remained infectable by HIV-1, these same cells failed to support a productive replication cycle when infected with a cloned isolate of HIV-1. In addition, two out of three M10-expressing CEM clones were also resistant to highly productive infection by a heterogeneous HIV-1 pool. Expression of M10 did not affect induction of HIV transcription mediated by the kappa B regulatory element or Tat. Importantly, constitutive expression of Rev M10 did not alter the secretion of interleukin 2 in response to mitogen stimulation of EL-4 and Jurkat cells. The inhibition of HIV infection in cells stably expressing a transdominant Rev protein, in the absence of any deleterious effect on T cell function, suggests that such a strategy could provide a therapeutic effect in the T lymphocytes of acquired immunodeficiency syndrome patients.

Sign in / Sign up

Export Citation Format

Share Document