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. 1997 Jun;17(6):3295–3304. doi: 10.1128/mcb.17.6.3295

Abrogation of interleukin-3 dependence of myeloid cells by the v-src oncogene requires SH2 and SH3 domains which specify activation of STATs.

P Chaturvedi 1, S Sharma 1, E P Reddy 1
PMCID: PMC232182  PMID: 9154828

Abstract

The v-src oncogene encodes a nonreceptor tyrosine kinase. When this gene was expressed in the myeloblastic cell line 32Dcl3, it was found to abrogate interleukin-3 (IL-3) dependence of this cell line and to block its ability to terminally differentiate into granulocytes in response to granulocyte colony-stimulating factor (GCSF). In contrast, a highly related tyrosine kinase gene, v-fgr, fails to render this cell line IL-3 independent for growth or to block its ability to undergo terminal differentiation in the presence of GCSF. The active structural domains of v-src that are responsible for the abrogation of IL-3 dependence of myeloid cells and the mechanisms by which v-src transforms these cells are at present unclear. To identify the domains in v-src which are responsible for this activity, we constructed several chimeric recombinants between the v-src and the related Src family member v-fgr by replacing portions of v-src with corresponding domains of v-fgr. These chimeric DNAs were transfected into 32Dcl3 cells and examined for their abilities to render this cell line IL-3 independent. Our results show that only chimeras containing both the SH3 and the SH2 domains of v-src were capable of rendering the 32Dcl3 cell line IL-3 independent. To understand the possible mechanisms underlying the IL-3-independent growth of v-src-transformed 32Dcl3 cells, we examined the phosphorylation status of JAK-1, JAK-2, and JAK-3 kinases in the v-src- and v-fgr-transformed 32Dcl3 cells. Our results show that none of the JAK kinases are constitutively phosphorylated by v-src or v-fgr. We then examined the phosphorylation status of the STAT (signal transducers and activators of transcription) family of transcription factors. Our results show that STAT1, STAT3, and STAT5 exist in a constitutively phosphorylated state in v-src-transformed 32Dcl3 cells, while such constitutive phosphorylation is not seen in v-fgr-transformed cell lines. Our results also show that STAT3 coimmunoprecipitates with v-Src, suggesting that the activation of STAT3 occurs due to direct association with v-Src. However, STAT1 and STAT5, which also exist in a constitutively phosphorylated state in v-src-transformed 32Dcl3 cells, do not coimmunoprecipitate with v-Src, suggesting that these proteins either interact weakly with v-Src or are phosphorylated by a mechanism distinctive from that of STAT3.

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Selected References

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