Expression of c-MET/HGF receptor mRNA and protein in human non-malignant and malignant prostate tissues.
We previously reported the expression of hepatocyte growth factor (HGF), a ligand for c-MET, at the level of mRNA and protein in human prostate tissues. The present study was carried out to evaluate the relationship between c-MET expression and cancer cell proliferation or effect of cancer therapy. The expression both in mRNA and protein levels of c-MET proto-oncogene was determined semi-quantitatively by reverse transcription-competitive polymerase chain reaction (RT-competitive PCR) and Western blot analysis for prostate tissues from 32 Japanese male subjects. In addition, tissue localization of c-MET translation product was examined by immunohistochemistry for corresponding specimens. Although there was significantly higher c-MET protein expression in malignant (prostate cancer treated with/without neoadjuvant endocrine therapy) than in non-malignant prostate tissues (normal prostate and benign prostate hyperplasia; BPH), unexpectedly, c-MET mRNA showed high expression in the non-malignant group. Thus, there was no parallelism between mRNA and protein expressions of c-MET. Endocrine therapy did not alter c-MET mRNA and protein expressions in human prostate cancer. Immunohistochemical localization and expression of c-MET protein was found to be intense in cancer cells and weak in epithelia of normal and hyperplastic prostates. Unconcerted expression of mRNA and protein of c-MET, the reason of which is uninterpretable, is supposed to be one of characteristics of human prostate cancer.
Tsuka
H
H
Department of Urology, Fukui Medical University, Matsuoka-cho, Fukui 910-1193, Japan.
Mori
H
H
Li
B
B
Kanamaru
H
H
Matsukawa
S
S
Okada
K
K
D000368:Aged; D000369:Aged, 80 and over; D015153:Blotting, Western; D015972:Gene Expression Regulation, Neoplastic; D006801:Humans; D007150:Immunohistochemistry; D008297:Male; D008875:Middle Aged; D011467:Prostate / Q000166:cytology / Q000378:metabolism*; D011470:Prostatic Hyperplasia / Q000235:genetics / Q000378:metabolism; D011471:Prostatic Neoplasms / Q000235:genetics / Q000378:metabolism* / Q000473:pathology; D000090063:Proto-Oncogene Mas; D019859:Proto-Oncogene Proteins c-met / Q000096:biosynthesis* / Q000235:genetics; D012333:RNA, Messenger / Q000096:biosynthesis*; D012334:RNA, Neoplasm / Q000096:biosynthesis; D020133:Reverse Transcriptase Polymerase Chain Reaction
C000715470:MAS1 protein, human; D000090063:Proto-Oncogene Mas; D012333:RNA, Messenger; D012334:RNA, Neoplasm; D019859:Proto-Oncogene Proteins c-met