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Cell Growth & Differentiation, Vol 8, Issue 12 1267-1276, Copyright © 1997 by American Association of Cancer Research

ARTICLES

Constitutive activation of Stat3 in fibroblasts transformed by diverse oncoproteins and in breast carcinoma cells

R Garcia, CL Yu, A Hudnall, R Catlett, KL Nelson, T Smithgall, DJ Fujita, SP Ethier and R Jove
Molecular Oncology Program, H. Lee Moffitt Cancer Center and Research Institute, Tampa, FL 33612, USA.

Signal transducers and activators of transcription (STATs) were originally identified as key components of signaling pathways involved in mediating responses to IFNs. Previous studies showed that the Src oncoprotein constitutively activates one STAT family member, Stat3. In this study, we investigated STAT activation in a panel of rodent fibroblast cell lines stably transformed by diverse viral oncoproteins. Using a temperature-sensitive mutant of v-Src, we determined that Stat3 is activated within 15 min of shift from nonpermissive to permissive temperature for cell transformation. This finding indicates that v-Src tyrosine kinase activity is required for Stat3 activation and suggests that Stat3 is proximal to signaling initiated by Src. In addition, Stat3 activation is induced by another nonreceptor tyrosine kinase, v-Fps; by polyoma virus middle T antigen, which activates Src family kinases; and by v-Sis, which acts as a ligand for the platelet-derived growth factor receptor. In contrast SV40 large T antigen, which transforms cells through different mechanisms, and the v-Ras and v-Raf oncoproteins, which lie in signaling pathways downstream of tyrosine kinases, do not activate Stat3. We did not detect significant activation of Stat1, Stat5, or Stat6 in fibroblasts transformed by the viral oncoproteins investigated. Moreover, Stat3 is activated in response to epidermal growth factor (EGF) but not heregulins in immortalized normal human breast epithelial cells. Because constitutive activation of c-Src and EGF receptor kinases is associated with the progression of breast cancer, we examined activation of STATs in human cell lines derived from breast carcinomas. We detected constitutive activation of Stat3 in five of nine breast carcinoma cell lines but not in normal breast epithelial cells. Furthermore, experiments with an EGF receptor-specific inhibitor indicated that the constitutive activation of Stat3 in these breast carcinoma cell lines is not necessarily dependent on signaling through the EGF receptor, although EGF stimulation further increases Stat3 activation. Taken together, our results demonstrate that selective activation of Stat3 is a common event during oncogenic transformation that directly or indirectly involves activation of specific tyrosine kinase signaling pathways.


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