Related Experiment Video
Updated: Aug 17, 2026
Methods Development for Blood Borne Macrophage Carriage of Nanoformulated Antiretroviral Drugs
Published on: December 9, 2010
Human Beta-Defensin 2 and 3 Inhibit HIV-1 Replication in Macrophages
Jennifer P Bharucha1, Lingling Sun1, Wuyuan Lu1,2
1Division of Virology, Pathogenesis, and Cancer, Institute of Human Virology, University of Maryland School of Medicine, Baltimore, MD, United States.
Abstract:
Human beta-defensins (hBDs) are broad-spectrum antimicrobial peptides, secreted by epithelial cells of the skin and mucosae, and astrocytes, which we and others have shown to inhibit HIV-1 in primary CD4+ T cells. Although loss of CD4+ T cells contributes to mucosal immune dysfunction, macrophages are a major source of persistence and spread of HIV and also contribute to the development of various HIV-associated complications. We hypothesized that, besides T cells, hBDs could protect macrophages from HIV. Our data in primary human monocyte-derived macrophages (MDM) in vitro show that hBD2 and hBD3 inhibit HIV replication in a dose-dependent manner. We determined that hBD2 neither alters surface expression of HIV receptors nor induces expression of anti-HIV cytokines or beta-chemokines in MDM. Studies using a G-protein signaling antagonist in a single-cycle reporter virus system showed that hBD2 suppresses HIV at an early post-entry stage via G-protein coupled receptor (GPCR)-mediated signaling. We find that MDM express the shared chemokine-hBD receptors CCR2 and CCR6, albeit at variable levels among donors. However, cell surface expression analyses show that neither of these receptors is necessary for hBD2-mediated HIV inhibition, suggesting that hBD2 can signal via additional receptor(s). Our data also illustrate that hBD2 treatment was associated with increased expression of APOBEC3A and 3G antiretroviral restriction factors in MDM. These findings suggest that hBD2 inhibits HIV in MDM via more than one CCR thus adding to the potential of using β-defensins in preventive and therapeutic approaches.
Insights
Human beta-defensins (hBDs) inhibit HIV replication in macrophages. These antimicrobial peptides, like hBD2, offer potential for new HIV therapies by targeting macrophages, a key virus reservoir.
Area of Science:
- Immunology
- Virology
- Antimicrobial Peptides
Background:
- Human beta-defensins (hBDs) are antimicrobial peptides known to inhibit HIV-1 in CD4+ T cells.
- Macrophages are crucial for HIV persistence and spread, and contribute to HIV-associated complications.
- The role of hBDs in protecting macrophages from HIV remains largely unexplored.
Purpose of the Study:
- To investigate the potential of hBDs, specifically hBD2 and hBD3, in inhibiting HIV replication in primary human monocyte-derived macrophages (MDM).
- To elucidate the mechanism by which hBD2 inhibits HIV in MDM, including receptor usage and signaling pathways.
Main Methods:
- In vitro studies using primary human MDM exposed to HIV.
- Dose-response experiments to assess hBD2 and hBD3 inhibition of HIV replication.
- Analysis of HIV receptor expression, cytokine/chemokine induction, G-protein coupled receptor (GPCR) signaling, and antiretroviral restriction factors (APOBEC3A/3G).
Main Results:
- hBD2 and hBD3 demonstrated dose-dependent inhibition of HIV replication in MDM.
- hBD2 inhibited HIV at an early post-entry stage via GPCR-mediated signaling, independent of CCR2 and CCR6.
- hBD2 treatment increased the expression of APOBEC3A and 3G antiretroviral restriction factors in MDM.
Conclusions:
- hBD2 and hBD3 effectively inhibit HIV replication in macrophages, suggesting a broader role for hBDs in HIV defense.
- hBD2's mechanism involves GPCR signaling and upregulation of APOBEC3 restriction factors, indicating a multi-faceted antiviral effect.
- These findings highlight the therapeutic potential of beta-defensins for HIV prevention and treatment, particularly targeting macrophage reservoirs.
More Related Videos
08:11Assessing the Innate Sensing of HIV-1 Infected CD4+ T Cells by Plasmacytoid Dendritic Cells Using an Ex vivo Co-culture System.
Published on: September 1, 2015
07:21Processing of Bronchoalveolar Lavage Fluid and Matched Blood for Alveolar Macrophage and CD4+ T-cell Immunophenotyping and HIV Reservoir Assessment
Published on: June 23, 2019
Related Concept Videos
01:29Immune Response Against Viral Pathogens
NK Cells
NK cells are a crucial part of our innate immune system, acting as the first line of defense against viral infections. These cells can recognize and kill infected cells without prior exposure to the virus, effectively slowing down the spread of infection. Additionally, NK cells produce proinflammatory...
01:25Inhibitors Of Virion Release
01:19Inhibitors of Virion Maturation and Assembly