Research Project
Grant-in-Aid for Scientific Research (C)
Ankyrin-repeat protein with a PEST motif and a proline-rich region(Arpp), also designated as Ankrd2, is a member of the muscle ankyrin repeat proteins (MARPs), which have been proposed to be involved in muscle stress response pathways. Arpp/Ankrd2 is localized mainly in the I-band of striated muscle. However, it has recently been reported that Arpp/Ankrd2 can interact with nuclear proteins, such as premyelocytic leukemia protein (PML), p53 and YB- 1 in vitro. In this study, to determine whether nuclear accumulation of Arpp/Ankrd2 actually occurs, we performed an immunohistochemical investigation of gastrocnemius muscles that had been injured by injection of cardiotoxin or contact with dry ice. We found that Arpp/Ankrd2 accumulated in the nuclei of myofibers located adjacent to severely damaged myofibers after muscle injury. Double-labeled immunohistochemistry revealed that Arpp/Ankrd2 accumulated in the nuclei of sarcomere-damaged myofibers. Furthermore, we found that Arpp/Ankrd2 tended to be localized in euchromatin where genes are transcriptionally activated. Based on these findings, we suggest that Arpp/Ankrd2 may translocate from the I-band to the nucleus in response to muscle damage and may participate in the regulation of gene expression.
All 2008 2007 2006
All Journal Article (14 results) (of which Peer Reviewed: 6 results) Presentation (2 results)
Histochemistry and Cell Biology 129
Pages: 55-64
Histochemistry and Cell Biology vol.129
Human Pathology 38
Pages: 410-419
Journal of Pathology 213
Pages: 392-401
Human Pathology vol.38
Journal of Pathology vol.213
Modern Pathology 20
Pages: 199-207
Southern Medical Journal 100
Pages: 218-221
Cancer Science 98
Pages: 521-528
Pathology International 56
Pages: 368-374
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