Journal
JOURNAL OF CELL SCIENCE
Volume 126, Issue 24, Pages 5670-5680Publisher
COMPANY OF BIOLOGISTS LTD
DOI: 10.1242/jcs.134361
Keywords
JNK; ERM; Moesin; Podosome rosettes; Phosphorylation
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Funding
- National Science Council, Taiwan [NSC100-2320-B-005-004-MY3]
- National Health Research Institutes, Taiwan [NHRI-EX101-10103BI]
- ATU plan from the Ministry of Education, Taiwan
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Podosomes are actin-based membrane protrusions that facilitate extracellular matrix degradation and motility of invasive cells. Podosomes can self-organize into large rosette-like structures in Src-transformed fibroblasts, osteoclasts and some highly invasive cancer cells. However, the mechanism of this assembly remains obscure. In this study, we show that the suppression of Jun N-terminal kinase (JNK) by the JNK inhibitor SP600125 or short-hairpin RNA inhibited podosome rosette formation in SrcY527F-transformed NIH3T3 fibroblasts. In addition, SrcY527F was less able to induce podosome rosettes in JNK1-null or JNK2-null mouse embryo fibroblasts than in wild-type counterparts. The kinase activity of JNK was essential for promoting podosome rosette formation but not for its localization to podosome rosettes. Moesin, a member of the ERM (ezrin, radixin and moesin) protein family, was identified as a substrate of JNK. We show that the phosphorylation of moesin at Thr558 by JNK was important for podosome rosette formation in SrcY527F-transformed NIH3T3 fibroblasts. Taken together, our results unveil a novel role of JNK in podosome rosette formation through the phosphorylation of moesin.
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