Publication Date:
1984-10-26
Description:
A protein (27,000 molecular weight) was previously found in rat Leydig cells after treatment with estradiol (E2) and human chorionic gonadotropin (hCG) in vitro. The effect of hCG occurred through increased E2 production. This hormone-regulated rat testicular protein was compared to an estrogen-regulated protein of similar physical characteristics isolated from a human mammary cancer cell line (MCF-7) and present in normal human estrogen target organs. The Leydig cells from rat and human tissue showed specific immunofluorescence and immunoperoxidase staining in the cytoplasm upon incubation with a monoclonal antibody (C11) to the estrogen-regulated protein from MCF-7 cells. Leydig cells after exposure to E2 or hCG showed the highest fluorescence intensity; this intensity was reduced by treatment with Tamoxifen. No reaction was associated with other testicular cells. The estrogen-regulated protein from human cell lines is therefore immunologically similar to that from the rat Leydig cell. The monoclonal antibody should be useful for further characterization of the Leydig cell protein.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Ciocca, D R -- Dufau, M L -- CA 11378/CA/NCI NIH HHS/ -- New York, N.Y. -- Science. 1984 Oct 26;226(4673):445-6.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6387908" target="_blank"〉PubMed〈/a〉
Keywords:
Adult
;
Animals
;
*Antibodies, Monoclonal
;
Breast Neoplasms/metabolism
;
Cell Line
;
Chorionic Gonadotropin/pharmacology
;
Cross Reactions
;
Estradiol/pharmacology
;
Fluorescent Antibody Technique
;
Humans
;
Immunoenzyme Techniques
;
Leydig Cells/*analysis
;
Male
;
Middle Aged
;
Proteins/*analysis
;
Rats
Print ISSN:
0036-8075
Electronic ISSN:
1095-9203
Topics:
Biology
,
Chemistry and Pharmacology
,
Computer Science
,
Medicine
,
Natural Sciences in General
,
Physics
