title: Breast gross cystic disease fluid analysis. I. Isolation and radioimmunoassay for a major component protein.
abstract: Human breast gross cystic disease (GCD) fluid was analyzed by sodium dodecyl sulfate-acrylamide gel electrophoresis, and four major proteins (GCDFP-70), GCDFP-44, GCDFP-24, and GCDFP-15) were identified. By fractionation techniques, these proteins were separated from one another. The GCDFP-70 was immunologically identical to human albumin and was present in GCD fluid at approximately a 100-fold lower concentration than in plasma. The GCDFP-44 was immunologically identical to human plasma Zn-alpha2-glycoprotein; however, it was present in GCD fluid at an approximately 50-fold higher concentration than in plasma. The GCDFP-24 was the major component protein of GCD fluid. It had progesterone binding activity, and immunologically it was identical to a component of human plasma; however, antisera that identified 30 separate components of plasma failed to identify the GCDFP-24 as one of these plasma proteins. The GCDFP-24 concentration in GCD fluid was approximately 100-fold higher than the plasma analog. The GCDFP-15 component was immunologically distinct from any plasma components, as judged by Ouchterlony analysis. It was, however, immunologically identical with a component of both human milk and saliva. As revealed by radioimmunoassay, plasma levels in normal subjects were 7-85 ng/ml. In patients with metastatic breast carcinoma, markedly plasma levels (150-30,000 ng/ml) of this protein were detected. Short-term tissue cultures of breast carcinoma explants released this protein into the culture medium.
mesh_terms: D000328:Adult; D001826:Body Fluids / Q000032:analysis; D001941:Breast Diseases / Q000209:etiology / Q000378:metabolism* / Q000503:physiopathology; D001943:Breast Neoplasms / Q000032:analysis / Q000209:etiology; D003560:Cysts / Q000378:metabolism*; D004591:Electrophoresis, Polyacrylamide Gel; D005260:Female; D006801:Humans; D008875:Middle Aged; D011506:Proteins / Q000032:analysis*; D011863:Radioimmunoassay
chemical_list: D011506:Proteins