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James A. Hoxie, M.D.

James A. Hoxie, M.D.

faculty photo
Professor of Medicine
Department: Medicine
Graduate Group Affiliations

Contact information
522G Johnson Pavilion
3610 Hamilton Walk
Philadelphia, PA 19104
Office: (215) 898-0261
Fax: (215) 573-7356
Lab: 215-898-0263
Education:
B.A.
Wesleyan University, 1972.
M.D.
University of Pennsylvania, 1976.
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Description of Research Expertise

Research Interests
Viral and cellular aspects of HIV (human immunodeficiency virus) and SIV (simian immunodeficiency virus) entry into cells; HIV and SIV pathogenesis; mechanisms of viral resistance to the host immune response; neutralizing antibodies.

Key words: AIDS, CD4, chemokine receptors, HIV, SIV, envelope glycoproteins, viral entry, neutralization, vaccine.

Description of Research
Research in Dr. Hoxie's lab is focused on identifying viral and cellular determinants that are relevant to the ability of HIV and SIV to infect cells and to evade host immune responses. Three specific areas of work include:

1. Producing modified HIV envelope glycoproteins for vaccine studies. This work is directed towards deriving HIV envelope glycoproteins that can elicit broadly neutralizing antibodies. Current approaches are deriving viruses lacking structures that are believed to shield the envelope from humoral immune responses.

2. Studies of CD4-independent isolates of HIV. Dr. Hoxie has described CD4-independent isolates of HIV-1 and HIV-2 that can infect cells using chemokine receptors without CD4. His lab has shown that the genetic basis for this phenotype results from mutations that expose the chemokine receptor binding site on gp120. Efforts are in progress to identify the structural basis for this effect and to use CD4-independent envelope glycoproteins as HIV vaccine candidates.

3. The role of the HIV/SIV cytoplasmic tail in pathogenesis. Dr. Hoxie's group has identified endocytosis signals in the cytoplasmic tails of HIV, SIV and FIV Env proteins that reduce Env expression on the surface of infected cells. Dr. Hoxie has proposed that these signals could be relevant in pathogenesis by enabling virus-producing cells to survive host anti-viral immune responses. He has shown in an SIV model that viruses with mutations in this domain are markedly attenuated in vivo and controllable by host immune responses. Ongoing studies are addressing the mechanism for this attenuation, the components of the host immune response that are involved, and defects in viral assembly that are believed to underlie this effect.

Rotation Projects
-Structure function studies of envelope glycoproteins focusing on mechanisms of CD4 and chemokine receptor engagement.
M-odulation of Envelope glycoproteins for the design of immunogens that can elicit broadly neutralizing antibodies.
-The role of the HIV/SIV cytoplasmic tail in pathogenesis.
-Studies evaluating mechanisms of neutralization sensitivity and resistance to antibodies.

Lab personnel:
Research Specialists:
Beth Haggarty
Josephine Romano
Andrea Polachini-Oliveira Jordan
Students:
Adrienne Swanstrom
Kitu Kumar
Mike Hogan
Samra Zelman
Post Docs:
George Leslie

Description of Clinical Expertise

Hematologic malignancies
Allogeneic stem cell and bone marrow transplantation
HIV/AIDS

Selected Publications

Nolan KM, Jordan AP, and Hoxie JA: Effects of partial deletions within the HIV-1 V3 loop on coreceptor tropism and sensitivity to entry inhibitors. J. Virology 82(2): 664-73, January 2008.

Lin G, Bertolotti-Ciarlet A, Haggarty B, Romano J, Nolan KM, Leslie GJ, Jordan AP, Huang CC, Kwong PD, Doms RW, Hoxie J: Replication-competent variants of human immunodeficiency virus type 2 lacking the V3 loop exhibit resistance to chemokine receptor antagonists. J. Virology 81(18): 9956-66, September 2007.

Laakso MM, Lee FH, Haggarty B, Agrawal C, Nolan KM, Biscone M, Romano J, Jordan AP, Leslie GJ, Meissner EG, Su L, Hoxie JA, Doms RW: V3 loop truncations in HIV-1 envelope impart resistance to coreceptor inhibitors and enhanced sensitivity to neutralizing antibodies. PLoS Pathogens 3(8): e117, August 2007.

Fernando K, Hu H, Ni H, Hoxie JA, Weissman D: Vaccine-delivered HIV envelope inhibits CD4(+) T-cell activation, a mechanism for poor HIV vaccine responses. Blood 9(6): 2538-44, March 2007.

Byland R, Vance PJ, Hoxie JA, Marsh M: A conserved dileucine motif mediates clathrin and AP-2-dependent endocytosis of the HIV-1 envelope protein. Mol. Biol Cell 18(2): 414-25, February 2007.

Chaipan C, Soilleux EJ, Simpson P, Hofmann H, Gramberg T, Marzi A, Geier M, Stewart EA, Eisemann J, Steinkasserer A, Suzuki-Inoue K, Fuller GL, Pearce AC, Watson SP, Hoxie JA, Baribaud F, Pohlmann S: DC-SIGN and CLEC-2 mediate human immunodeficiency virus type 1 capture by platelets. J. Virology 80(18): 8951-60, September 2006.

Wei Q, Stallworth JW, Vance PJ, Hoxie JA, Fultz PN: Simian immunodeficiency virus (SIV)/immunoglobulin G immune complexes in SIV-infected macaques block detection of CD16 but not cytolytic activity of natural killer cells. Clin. Vaccine Immunology 13(7): 768-78, July 2006.

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Last updated: 04/15/2014
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