Golgi coiled-coil proteins contain multiple binding sites for rab family G proteins

R. Brad Jones, Lishomwa C. Ndhlovu, Jason D. Barbour, Prameet M. Sheth, Aashish R. Jha, Brian R. Long, Jessica C. Wong, Malathy Satkunarajah, Marc Schweneker, Joan M. Chapman, Gabor Gyenes, Bahareh Vali, Martin D. Hyrcza, Feng Yun Yue, Colin Kovacs, Aref Sassi, Mona Loutfy, Roberta Halpenny, Desmond Persad, Gerald SpottsFrederick M. Hecht, Tae Wook Chun, Joseph M. McCune, Rupert Kaul, James M. Rini, Douglas F. Nixon, Mario A. Ostrowski

Research output: Contribution to journalArticlepeer-review


Progressive loss of T cell functionality is a hallmark of chronic infection with human immunodef ciency virus 1 (HIV-1). We have identif ed a novel population of dysfunctional T cells marked by surface expression of the glycoprotein Tim-3. The frequency of this population was increased in HIV-1 - infected individuals to a mean of 49.4 ± SD 12.9% of CD8 + T cells expressing Tim-3 in HIV-1 - infected chronic progressors versus 28.5 ± 6.8% in HIV-1 - uninfected individuals. Levels of Tim-3 expression on T cells from HIV-1- infected inviduals correlated positively with HIV-1 viral load and CD38 expression and inversely with CD4 + T cell count. In progressive HIV-1 infection, Tim-3 expression was up-regulated on HIV-1 - specif c CD8 + T cells. Tim-3 - expressing T cells failed to produce cytokine or proliferate in response to antigen and exhibited impaired Stat5, Erk1/2, and p38 signaling. Blocking the Tim-3 signaling pathway restored proliferation and enhanced cytokine production in HIV- 1 - specif c T cells. Thus, Tim-3 represents a novel target for the therapeutic reversal of HIV-1 - associated T cell dysfunction.

Original languageEnglish (US)
Pages (from-to)607-615
Number of pages9
JournalJournal of Cell Biology
Issue number4
StatePublished - Nov 17 2008

ASJC Scopus subject areas

  • Cell Biology

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