Sexual transmission of human immunodeficiency type 1 (HIV-1) in humans is characterized by the remarkable ability of the virus to transverse mucosal epithelial barriers and initiate infection of cells in the underlying tissues. Immature dendritic cell subsets present in the peripheral mucosal tissues capture virus particles, migrate to peripheral lymph nodes, mature and help initiate adaptive immune responses against the invading pathogen by interacting with T cells. HIV, in turn, has exploited dendritic cell - T cell interactions for its dissemination in the infected individual. Though HIV particles can be captured by dendritic cell-specific attachment factors such as dendritic cell-specific intercellular adhesion molecule grabbing non-integrin (DC-SIGN), it remains unclear as to how these captured particles are transferred to CD4+ T cells. We propose herein to study the mechanism of dendritic cell mediated HIV-1 transmission to T cells. We will explore the hypothesis that captured virus particles traffic to unique intracellular compartments where HIV is maintained without loss of infectivity, and that during the course of normal dendritic cell - T cell interactions virus particles are released to facilitate robust infections of T cells. The mechanism of cell associated virus transfer will be addressed by the following Specific Aims: 1) To define the nature of intracellular compartment in dendritic cells that harbors infectious virus particles following capture;2) To explore how HIV accesses this intracellular compartment, specifically following DCSIGN binding and whether the nature of the endocytic pathway that is targeted by virus particle binding to DC-SIGN defines long term infectivity of HIV in dendritic cells;3) To determine the signals that stimulate the release of internalized HIV to the extracellular milieu. We believe that the studies described in these aims would delineate the role of dendritic cells, and especially DC-SIGN, in the initiation and propagation of HIV-1 infection in vivo.

Agency
National Institute of Health (NIH)
Institute
National Institute of Allergy and Infectious Diseases (NIAID)
Type
Research Project (R01)
Project #
5R01AI064099-05
Application #
7573468
Study Section
AIDS Immunology and Pathogenesis Study Section (AIP)
Program Officer
Sharma, Opendra K
Project Start
2005-06-01
Project End
2010-06-30
Budget Start
2009-03-01
Budget End
2010-06-30
Support Year
5
Fiscal Year
2009
Total Cost
$375,554
Indirect Cost
Name
Boston University
Department
Microbiology/Immun/Virology
Type
Schools of Medicine
DUNS #
604483045
City
Boston
State
MA
Country
United States
Zip Code
02118
Pena-Cruz, Victor; Agosto, Luis M; Akiyama, Hisashi et al. (2018) HIV-1 replicates and persists in vaginal epithelial dendritic cells. J Clin Invest 128:3439-3444
Akiyama, Hisashi; Miller, Caitlin M; Ettinger, Chelsea R et al. (2018) HIV-1 intron-containing RNA expression induces innate immune activation and T cell dysfunction. Nat Commun 9:3450
Xu, Fangda; Bandara, Asanga; Akiyama, Hisashi et al. (2018) Membrane-wrapped nanoparticles probe divergent roles of GM3 and phosphatidylserine in lipid-mediated viral entry pathways. Proc Natl Acad Sci U S A 115:E9041-E9050
Nazari, Mina; Xi, Min; Lerch, Sarah et al. (2017) Plasmonic Enhancement of Selective Photonic Virus Inactivation. Sci Rep 7:11951
Miller, Caitlin M; Akiyama, Hisashi; Agosto, Luis M et al. (2017) Virion-Associated Vpr Alleviates a Postintegration Block to HIV-1 Infection of Dendritic Cells. J Virol 91:
Feizpour, Amin; Stelter, David; Wong, Crystal et al. (2017) Membrane Fluidity Sensing on the Single Virus Particle Level with Plasmonic Nanoparticle Transducers. ACS Sens 2:1415-1423
Kozlowski, Elyse; Wasserman, Gregory A; Morgan, Marcos et al. (2017) The RNA uridyltransferase Zcchc6 is expressed in macrophages and impacts innate immune responses. PLoS One 12:e0179797
Akiyama, Hisashi; Ramirez, Nora-Guadalupe Pina; Gibson, Gregory et al. (2017) Interferon-Inducible CD169/Siglec1 Attenuates Anti-HIV-1 Effects of Alpha Interferon. J Virol 91:
Ruedas, John B; Ladner, Jason T; Ettinger, Chelsea R et al. (2017) Spontaneous Mutation at Amino Acid 544 of the Ebola Virus Glycoprotein Potentiates Virus Entry and Selection in Tissue Culture. J Virol 91:
Ahi, Yadvinder S; Zhang, Shu; Thappeta, Yashna et al. (2016) Functional Interplay Between Murine Leukemia Virus Glycogag, Serinc5, and Surface Glycoprotein Governs Virus Entry, with Opposite Effects on Gammaretroviral and Ebolavirus Glycoproteins. MBio 7:

Showing the most recent 10 out of 30 publications