[In vitro studies on the expression of c-myc oncogene product in gynecological cultured cancer cells].
In this study, immunocytochemical and biochemical detection of c-myc protein in gynecological cultured cancer cells were performed together with gene expression of the cells. OMC-1 (cervical squamous carcinoma cell line), OMC-2 (endometrial adenocarcinoma cell line), OMC-3 (ovarian mucinous adenocarcinoma cell line) and OMC-4 (cervical adenocarcinoma cell line) were used. Immunocytochemically, c-myc protein was detected in both nuclei and cytoplasms of cultured cells when they were fixed in 95% ethanol, 10% formalin and 4% paraformaldehyde (PFA) including 10mM NaCl. However, it was detected in the nuclei of almost all of the cells in nuclei of the cells when they were fixed in 4% PFA including 1,000mM NaCl. Western blotting against a nuclear fraction of the cells demonstrated 66Kd protein in OMC-1 and 62Kd protein in OMC-2,3,4, respectively. They were completely absorbed by c-myc synthetic peptide. However, there was no reaction against the cytoplasmic fraction of the cells. Slot blot hybridization against the DNA of the cells demonstrated 15 times and 5 times c-myc gene amplification in OMC-2 and OMC-4, respectively. These results suggest that OMC-1,2,3,4 can be used as positive controls for the immunocyto- and histochemical detection of c-myc protein in clinical materials. However, it must be noted that the redistribution of c-myc nuclear protein into the cytoplasm may occur in the fixation process.
Ueda
M
M
Department of Obstetrics and Gynecology, Osaka Medical College.
Seiki
Y
Y
Yamada
T
T
Okamoto
Y
Y
Tsurunaga
T
T
Iwai
E
E
Ueki
M
M
Sugimoto
O
O
D001345:Autoradiography; D005260:Female; D015972:Gene Expression Regulation, Neoplastic; D005833:Genital Neoplasms, Female / Q000235:genetics / Q000378:metabolism*; D006801:Humans; D007150:Immunohistochemistry; D010051:Ovarian Neoplasms / Q000235:genetics / Q000378:metabolism; D016271:Proto-Oncogene Proteins c-myc / Q000378:metabolism*; D014407:Tumor Cells, Cultured; D002583:Uterine Cervical Neoplasms / Q000235:genetics / Q000378:metabolism
D016271:Proto-Oncogene Proteins c-myc