The JAK-inhibitor, JAB/SOCS-1 selectively inhibits cytokine-induced, but not v-Src induced JAK-STAT activation.

Abstract:

:Recently, constitutive activation of JAK kinases (JAKs) and/or signal transducers and activators of transcription (STATs) has been reported in growing numbers of human cancer cells as well as oncogene-transformed cells. JAB/SOCS-1 has been shown to be an intrinsic JAK tyrosine kinase inhibitor and to suppress the cytokine-dependent JAK-STAT pathway. In this report, we investigated the effect of ectopic expression of JAB on v-Src-induced JAK-STAT activation. Forced expression of JAB in v-Src-transformed NIH3T3 cells neither suppressed phosphorylation of STAT3 and JAK1/JAK2 nor blocked STAT3-reporter gene activation. Colony forming assay also showed that JAB did not suppress v-Src-induced transformation of NIH3T3 cells, while dominant negative STAT3 suppressed it. In contrast, JAB could downregulate phosphorylation of STAT1 and STAT3 induced by interferon gamma (IFNgamma) and interleukin-6 (IL-6) plus soluble IL6 receptor (sIL-6R), respectively. Furthermore, in vitro kinase assay indicated that JAB suppressed hyperactivation of JAK1/JAK2 and JAK1 induced by IFNgamma and IL-6 plus sIL-6R respectively, but not v-Src-induced basal JAK1/JAK2 activity. Nevertheless, both JAK1/JAK2 activated by v-Src and that activated by IL-6 plus sIL-6R could similarly bind JAB. These results clearly demonstrate that JAB distinguishes cytokine-induced JAK-STAT signaling from v-Src-induced one and can not suppress the transformation with v-Src.

journal_name

Oncogene

journal_title

Oncogene

authors

Iwamoto T,Senga T,Naito Y,Matsuda S,Miyake Y,Yoshimura A,Hamaguchi M

doi

10.1038/sj.onc.1203829

subject

Has Abstract

pub_date

2000-09-28 00:00:00

pages

4795-801

issue

41

eissn

0950-9232

issn

1476-5594

journal_volume

19

pub_type

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