HIV infection in vitro enhances the activity of src-family protein tyrosine kinases

David J. Phipps, Stanley E. Read, John P. Piovesan, Gordon B. Mills, Donald R. Branch

Research output: Contribution to journalArticlepeer-review

19 Scopus citations


Objective: We examined the effect of HIV infection on src-family protein tyrosine kinase (PTK) activity to determine if alterations in src-family PTK activity could contribute to the HIV-related chronic immune System activation observed in patients infected with HIV. Methods: Jurkat, a CD4+ human T lymphocyte cell line was infected with HIV III(B). Kinase activity was determined by in vitro immune complex kinase assays using antibodies specific for the src-family PTKs, p56(lck), p59(fyn) and p60(c-src) expressed in T lymphocytes. PTK protein and total phosphotyrosine levels were assessed by Western blotting. The role of the gp120-CD4-Lck interaction in HIV-related PTK activation was determined using gp120-treated Jurkat cells and HIV-infection of jCaM 1.6 cells, a Jurkat-derived cell line that lacks p56(lck). Results: Cells infected with HIV for 24 h exhibited increased levels of total tyrosine phosphorylation and enhanced src-family PTK activity without altered levels of expression of src-family kinases. The activity of Lck and Fyn was enhanced within 30 min of infection. HIV-related src-family PTK activation was not a function of the gp120-CD4-Lck interaction and occurred in the presence of 10 mmol/l zidovudine indicating that reverse transcriptase and activation of the HIV genome is not required. Conclusions: HIV-related activation of src-family PTK is a response of the cell to early stages of the virus life cycle, possibly either membrane fusion or viral uncoating. These results indicate that endogenous src-family PTKs may play a role in HIV-related immune activation and dysfunction. Moreover, activation of src-family PTK may be a mechanism used by the virus to facilitate some aspect of its own life cycle.

Original languageEnglish (US)
Pages (from-to)1191-1198
Number of pages8
Issue number11
StatePublished - Jan 1 1996
Externally publishedYes


  • Fyn
  • HIV
  • Lck
  • Protein tyrosine kinase
  • Signal transduction
  • Src kinases
  • gp120
  • src

ASJC Scopus subject areas

  • Immunology and Allergy
  • Immunology
  • Infectious Diseases


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