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The Journal of Immunology, Vol 159, Issue 11 5206-5210, Copyright © 1997 by American Association of Immunologists

CUTTING EDGE

Constitutive activation of the Janus kinase-STAT pathway in T lymphoma overexpressing the Lck protein tyrosine kinase

CL Yu, R Jove and SJ Burakoff
Department of Pediatric Oncology, Dana-Farber Cancer Institute, Boston, MA 02115, USA.

The Lck protein, a Src family tyrosine kinase, plays a critical role in T cell maturation and activation. Dysregulation of Lck expression or Lck kinase activity has been implicated in T cell leukemias from mice to humans, although the mechanism underlying Lck-mediated oncogenesis is still largely unclear. We report here that both DNA binding activities and tyrosine phosphorylation of STAT3 and STAT5, but not STAT1, are constitutively enhanced in the mouse T cell lymphoma LSTRA, which is a well-characterized cell line that overexpresses Lck protein and exhibits high levels of Lck kinase activity. Furthermore, Janus kinase 1 (jak1) and Jak2 protein tyrosine kinases are constantly activated in these cells, as determined by their autophosphorylation in an in vitro kinase assay and increased levels of tyrosine phosphorylation on immunoblots. Therefore, like Src-transformed cells, Lck-overexpressing LSTRA cells also exhibit constitutive activation of distinct Jak and STAT proteins.


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