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1.
J Infect Dis ; 229(6): 1781-1785, 2024 Jun 14.
Artigo em Inglês | MEDLINE | ID: mdl-38385222

RESUMO

Human immunodeficiency virus type 1 (HIV-1) disease manifestations differ between cisgender women and men, including better control of viral replication during primary infection and less frequent residual HIV-1 replication on antiretroviral therapy (ART) in cisgender women with HIV-1 (WWH). Investigating plasmacytoid dendritic cell (pDC) functions and HIV-1 reservoir sizes in 20 WWH on stable ART, we observed inverse correlations between interferon-α and tumor necrosis factor responses of pDCs to Toll-like receptor 7/8 stimulation and intact/total proviral HIV-1 DNA levels. Additionally, ISG15 mRNA levels in peripheral blood mononuclear cells correlated with cytokine responses of pDCs. These findings demonstrate an association between higher type I interferon responses and lower HIV-1 reservoir sizes in WWH on ART, warranting studies to identify the underlying mechanisms.


Assuntos
Células Dendríticas , Infecções por HIV , HIV-1 , Interferon Tipo I , Receptor 7 Toll-Like , Humanos , Células Dendríticas/imunologia , Células Dendríticas/virologia , Feminino , Infecções por HIV/tratamento farmacológico , Infecções por HIV/imunologia , Infecções por HIV/virologia , Adulto , Pessoa de Meia-Idade , Replicação Viral/efeitos dos fármacos , Carga Viral , Antirretrovirais/uso terapêutico , Leucócitos Mononucleares/virologia , Leucócitos Mononucleares/imunologia
2.
AIDS Res Ther ; 10(1): 1, 2013 Jan 03.
Artigo em Inglês | MEDLINE | ID: mdl-23286882

RESUMO

BACKGROUND: Despite progress in the development of combined antiretroviral therapies (cART), HIV infection remains a significant challenge for human health. Current problems of cART include multi-drug-resistant virus variants, long-term toxicity and enormous treatment costs. Therefore, the identification of novel effective drugs is urgently needed. METHODS: We developed a straightforward screening approach for simultaneously evaluating the sensitivity of multiple HIV gag-pol mutants to antiviral drugs in one assay. Our technique is based on multi-colour lentiviral self-inactivating (SIN) LeGO vector technology. RESULTS: We demonstrated the successful use of this approach for screening compounds against up to four HIV gag-pol variants (wild-type and three mutants) simultaneously. Importantly, the technique was adapted to Biosafety Level 1 conditions by utilising ecotropic pseudotypes. This allowed upscaling to a large-scale screening protocol exploited by pharmaceutical companies in a successful proof-of-concept experiment. CONCLUSIONS: The technology developed here facilitates fast screening for anti-HIV activity of individual agents from large compound libraries. Although drugs targeting gag-pol variants were used here, our approach permits screening compounds that target several different, key cellular and viral functions of the HIV life-cycle. The modular principle of the method also allows the easy exchange of various mutations in HIV sequences. In conclusion, the methodology presented here provides a valuable new approach for the identification of novel anti-HIV drugs.

3.
iScience ; 26(11): 108209, 2023 Nov 17.
Artigo em Inglês | MEDLINE | ID: mdl-37953956

RESUMO

Type I interferons (IFN-I) are important mediators of antiviral immunity and autoimmune diseases. Female plasmacytoid dendritic cells (pDCs) exert an elevated capacity to produce IFN-I upon toll-like receptor 7 (TLR7) activation compared to male pDCs, and both sex hormones and X-encoded genes have been implicated in these sex-specific differences. Using longitudinal samples from a trans men cohort receiving gender-affirming hormone therapy (GAHT), the impact of testosterone injections on TLR7-mediated IFN-I production by pDCs was assessed. Single-cell RNA analyses of pDCs showed downregulation of IFN-I-related gene expression signatures but also revealed transcriptional inter-donor heterogeneity. Longitudinal quantification showed continuous reduction of IFN-I protein production by pDCs and reduced expression of IFN-I-stimulated genes in peripheral blood mononuclear cells (PBMCs). These studies in trans men demonstrate that testosterone administration reduces IFN-I production by pDCs over time and provide insights into the immune-modulatory role of testosterone in sex-specific IFN-I-mediated immune responses.

4.
Nat Commun ; 12(1): 4957, 2021 08 16.
Artigo em Inglês | MEDLINE | ID: mdl-34400653

RESUMO

Influenza during pregnancy can affect the health of offspring in later life, among which neurocognitive disorders are among the best described. Here, we investigate whether maternal influenza infection has adverse effects on immune responses in offspring. We establish a two-hit mouse model to study the effect of maternal influenza A virus infection (first hit) on vulnerability of offspring to heterologous infections (second hit) in later life. Offspring born to influenza A virus infected mothers are stunted in growth and more vulnerable to heterologous infections (influenza B virus and MRSA) than those born to PBS- or poly(I:C)-treated mothers. Enhanced vulnerability to infection in neonates is associated with reduced haematopoetic development and immune responses. In particular, alveolar macrophages of offspring exposed to maternal influenza have reduced capacity to clear second hit pathogens. This impaired pathogen clearance is partially reversed by adoptive transfer of alveolar macrophages from healthy offspring born to uninfected dams. These findings suggest that maternal influenza infection may impair immune ontogeny and increase susceptibility to early life infections of offspring.


Assuntos
Infecções Bacterianas/imunologia , Vírus da Influenza A/imunologia , Infecções por Orthomyxoviridae/virologia , Parto , Animais , Animais Recém-Nascidos , Modelos Animais de Doenças , Feminino , Hematopoese , Humanos , Influenza Humana/imunologia , Pulmão/imunologia , Macrófagos Alveolares , Camundongos , Camundongos Endogâmicos C57BL , Mães , Poli I-C , Gravidez
5.
J Infect Dis ; 194(6): 740-50, 2006 Sep 15.
Artigo em Inglês | MEDLINE | ID: mdl-16941339

RESUMO

S-adenosylmethionine decarboxylase (SAMDC), a key enzyme in polyamine biosynthesis, can be specifically inhibited by the experimental drug SAM486A. The pharmaceutical interference with SAMDC activity results in the depletion of the intracellular pool of spermidine and spermine. In particular, low spermidine levels compromise hypusine modification and, thereby, activation of eukaryotic initiation factor 5A (eIF-5A), which is a cellular cofactor of the essential human immunodeficiency virus type 1 (HIV-1) regulatory protein Rev. In the present study, we show that SAM486A efficiently suppresses HIV-1 replication, including the replication of viruses that are resistant to multiple reverse transcriptase and protease inhibitors. At drug concentrations that efficiently inhibit the formation of progeny viruses, no toxic effects of SAM486A on cellular metabolism are observed. It is demonstrated that the antiretroviral effect of SAM486A is based on the fact that Rev activity is severely compromised in drug-treated cells. Thus, inhibition of cellular SAMDC activity may provide a novel strategy to achieve suppression of otherwise drug-resistant viruses.


Assuntos
Adenosilmetionina Descarboxilase/antagonistas & inibidores , Amidinas/farmacologia , Inibidores Enzimáticos/farmacologia , HIV-1/efeitos dos fármacos , Indanos/farmacologia , Replicação Viral/efeitos dos fármacos , Adenosilmetionina Descarboxilase/efeitos dos fármacos , Adenosilmetionina Descarboxilase/metabolismo , Amidinas/toxicidade , Anticorpos Antivirais/metabolismo , Linhagem Celular , Sobrevivência Celular/efeitos dos fármacos , Primers do DNA/química , Farmacorresistência Viral/efeitos dos fármacos , Inibidores Enzimáticos/toxicidade , Genes rev/efeitos dos fármacos , Humanos , Indanos/toxicidade , Fatores de Iniciação de Peptídeos/efeitos dos fármacos , Reação em Cadeia da Polimerase/métodos , Proteínas de Ligação a RNA/efeitos dos fármacos , Ativação Transcricional/efeitos dos fármacos , Fator de Iniciação de Tradução Eucariótico 5A
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