Research Project
Grant-in-Aid for Scientific Research (C)
HGF (hepatocyte growth factor) and Met/HGF receptor tyrosine kinase play important roles in tissue regeneration. In non-injured normal tissues, Met activation/tyrosine phosphorylation is suppressed even following binding with HGF. Thus, HGF-dependent Met receptor activation may be regulated by not only HGF-binding but also cellular context such as cell-cell contact and cellular injury. In this research, suppressive mechanisms of Met activation through cell-cell contact and Ser985 phosphorylation in the juxtamembrane domain of the Met were investigated.1. In hepatocytes cultured at a sparse cell density, HGF induced prolonged Met activation and a marked mitogenic response. In contrast, HGF induced transient Met activation but failed to induce mitogenic response in confluent hepatocytes with tight cell-cell contact. Expression of the protein tyrosine phosphatase, LAR increased following HGF-stimulation specifically in confluent hepatocytes. LAR associated with Met and dephosphorylated ty … More rosine-phosphorylated Met. Thus functional association of LAR and Met underlies the inhibitory mechanism by which HGF-dependent Met activation is suppressed by cell-cell contact.2. In hepatocytes in culture, HGF-dependent Met tyrosine phosphorylation/activation was inhibited when Ser985 was phosphorylated. In the normal liver, Met Ser985 was phosphorylated, however, Ser985 was dephosphorylated after hepatic injury such as partial hepatectomy. In reciprocal manner to Ser985 phosphorylation, Met was activated after hepatic injury. The results suggest that Ser985 in the juxtamembrane domain of Met is regulated by tissue injury and that Ser985 phosphorylation in the juxtamembrane domain of Met may be a mechanism by which HGF-dependent Met activation is suppressed in non-injured organs. Because Met receptor deleted with the juxtamembrane is naturally expressed as a splicing variant, the juxtamembrane of the Met may play an important role in regulation of HGF-dependent Met activation in response to tissue injury.3. Physiological significance of the juxtamembrane domain of Met in the development and tissue regeneration is investigated using the transgenic mice which express only variant Met deleted with the juxtamembrane domain. Less
All 2008 2007 2006 Other
All Journal Article (93 results) (of which Peer Reviewed: 42 results) Presentation (16 results) Book (12 results) Patent(Industrial Property Rights) (1 results) (of which Overseas: 1 results)
J. Biotechnol. 133
Pages: 478-85
J. Cell. Mol. Med. 12
Pages: 391-408
Exp. Neurol. 210
Pages: 83-94
Front. Biosci. 13
Pages: 1943-1951
J. Gastroenterol. Hepatol. (In press)(掲載確定)
Proteomics (In press)(掲載確定)
120001130499
J Biotechnol 133
Pages: 478-485
120000811714
Exp Neurol 210(1)
Int. Arch. Allergy Immunol 145
Pages: 324-339
Biomed. Res 29
Pages: 77-84
130004724052
Front Biosci 13
J. Cell. Mol. Med 12
Front. Biosci 13
Pages: 7072-7086
J.Biotechnol 133
J.Cell.Mol.Med. (In press)
J.Gastroenterol.Hepatol (In press)
J.Neurochem (In press)
Front.Biosci. (In press)
Proteomics (In press)
Biochem, Biophys. Res. Commun. 358
Pages: 117-123
J. Biochem. 141
Pages: 653-660
Oncogene 26
Pages: 1245-1255
J. Heart Lung Transplant. 26
Pages: 935-943
Cancer Gene Ther. 14
Pages: 894-903
Int. Arch. Allergy Immunol. 148
Exp. Neurol. 207
Pages: 195-202
Blood 109
Pages: 3042-3049
In "Gene Therapy 2007" (eds, Ochiai, T., Shimada, H., Tagawa, M.)
Pages: 22-33
Biochem. Biophys. Res. Commun 358
J. Biochem 141
10020099195
J. Heart Lung Transplant
Cancer Gene Ther 14
Exp. Neurol 207(2)
Biochem, Biophys.Res.Commun 358
J.Biochem. 141
Int.Arch.Allergy Immunol. 148
Exp.Neurol. 207
Hypertension 48
Pages: 112-119
Blood (In press)
J. Hepatol. (In press)
J. Biol. Chem. 281
Pages: 8765-8772
Exp. Cell Res. 312
Pages: 1021-1030
Int. J. Cancer 119
Pages: 477-483
Int. J. Cancer 118
Pages: 1545-1555
Cancer Gene Ther. 13
Pages: 479-489
Gene Therapy 13
Pages: 1206-1213
Pages: 520-529
Neurobiol. Disease 21
Pages: 576-578
Bone 39
Pages: 27-34
J. Cereb. Blood Flow Met. 26
Pages: 1354-1365
Neurosci Lett. 407
Pages: 141-145
J. Nano Sci. Nanotechnol. 6
Pages: 2853-2859
J. Hepatol. 45
Pages: 688-695
Pages: 136-140
J. Biol. Chem 281
Cancer Gene Therapy 13
Cancer Gene Ther 13
Exp. Cell Res 312
Pages: 1021-2030
Pages: 576-586
J. Hepatol 45
J. Cereb. Blood Flow Metab 26
J. Nanosci. Nanotechnol 6
Neurosci. Lett. 407
J. Gastroenterol. Hepatol (in press)
Proteomics (in press)