Post-ischemic delayed expression of hepatocyte growth factor and c-Met in mouse brain following focal cerebral ischemia.
We investigated long-term changes in the expression of protein and mRNA of hepatocyte growth factor (HGF) and its receptor c-Met in mouse brain after permanent occlusion of the middle cerebral artery, by using immunohistochemistry and quantitative reverse transcription-polymerase chain reaction. HGF-immunopositive cells were observed in the periinfarct region from 4 days after occlusion, peaking at 14-28 days. The area containing HGF-immunopositive cells continued to expand until 28 days after occlusion. c-Met-immunopositive cells were observed exclusively at the periinfarct region at 7 and 14 days after occlusion. At 28 days after occlusion, there were many c-Met-immunopositive cells in the widespread periinfarct region. Triple immunohistochemical staining by using confocal laser scanning microscopy (CLSM) demonstrated that most of the HGF-immunopositive cells were localized to reactive astrocytes. The c-Met-immunopositive cells were also localized to reactive astrocytes. HGF mRNA was upregulated exclusively in the periinfarct region at 14 days. c-Met mRNA was upregulated in the periinfarct region from as late as 28 days after occlusion. Thus, HGF and c-Met show delayed expression in the periinfarct region at both protein and mRNA levels after induction of ischemia. Because HGF was recently shown to play critical roles in angiogenesis and neurotrophic activities, the temporal profiles of their expression may imply the involvement of HGF in the process of post-ischemic brain tissue repair.
Nagayama
Tomiko
T
Department of Neurology, Tokai University School of Medicine, Isehara, Kanagawa 259-1193, Japan.
Nagayama
Masao
M
Kohara
Saori
S
Kamiguchi
Hiroshi
H
Shibuya
Makoto
M
Katoh
Yuko
Y
Itoh
Johbu
J
Shinohara
Yukito
Y
D000818:Animals; D001253:Astrocytes / Q000378:metabolism / Q000473:pathology; D001921:Brain / Q000378:metabolism* / Q000473:pathology; D002545:Brain Ischemia / Q000378:metabolism*; D002544:Cerebral Infarction / Q000378:metabolism; D004195:Disease Models, Animal; D018450:Disease Progression; D005904:Glial Fibrillary Acidic Protein / Q000378:metabolism; D005911:Gliosis / Q000378:metabolism; D017228:Hepatocyte Growth Factor / Q000235:genetics / Q000378:metabolism*; D007150:Immunohistochemistry; D020244:Infarction, Middle Cerebral Artery / Q000378:metabolism; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D009416:Nerve Regeneration / Q000502:physiology; D019859:Proto-Oncogene Proteins c-met / Q000378:metabolism*; D012333:RNA, Messenger / Q000378:metabolism; D020133:Reverse Transcriptase Polymerase Chain Reaction
D005904:Glial Fibrillary Acidic Protein; D012333:RNA, Messenger; D017228:Hepatocyte Growth Factor; D019859:Proto-Oncogene Proteins c-met