[Interaction between beta-endorphin, steroids and peptide hormones in fibrocystic lesions of the female breast].

From preclimacteric women (n = 10, 45-50 years of age) with gross cystic breast disease, levels of beta-endorphin, estradiol, progesterone, luteinizing hormone, follicle-stimulating hormone, thyroid-stimulating hormone, cortisol and prolactin were assayed radiochemically in the breast cyst fluid and in plasma. The beta-endorphin concentration (fmol/ml) was increased more than fourfold in the breast cyst fluid (17.6 +/- 4.6 SEM) than in plasma (4.2 +/- 0.5 SEM). In the breast cyst fluid, estradiol was increased 41-fold (1738.2 +/- 350.5 SEM pg/ml), and progesterone 47-fold (65.47 +/- 8.25 SEM ng/ml) more than in plasma. The significantly increased values of beta-endorphin, estradiol and progesterone in the breast cyst fluid and the identification of beta-endorphin in cyst-lining epithelia demonstrate the local synthesis. Growth factor-like properties of beta-endorphin and estradiol are accountable for the propagation of cystic changes. The autonomic formation and function of beta-endorphin, estradiol and progesterone in cyst compartments can not be related with the levels of luteinizing hormone, follicle-stimulating hormone, thyroid-stimulating hormone and cortisol, which were significantly higher in plasma than in the breast cyst fluid. In the breast cyst fluid, prolactin could not detected to be significantly higher than in plasma. In addition the plasma-concentration of testosterone, androstenedione, thyroxin, triiodothyronine, thyroid-binding globulin, sexual-hormone-binding-globulin could be detected within the normal range. In this study we could demonstrate the synergism of beta-endorphin, steroid hormones and peptide hormones which advance the growth of gross cystic disease of preclimacteric women. Beta-endorphin was also examined by immunocytochemical assays (fluorescence, alkaline phosphatase and horseradish peroxidase method), in 11 women with pure fibrocystic disease, in 7 women with fibrocystic disease combined with a carcinoma in situ and in 15 women with fibrocystic disease combined with invasive carcinoma of the breast. Sections of frozen and paraffin embedded tissue of the same patient were reacted with anti-beta-endorphin antiserum. The immunoreactivity of beta-endorphin was intense in normal, proliferative altered and cyst-lining epithelia of fibrocystic disease and decreased in atypical epithelia and carcinoma cells of the breast. The degree of beta-endorphin staining is related to the degree of cell differentiation. In addition, nuclear receptors for estrogen and progesterone were assayed by peroxidase antiperoxidase technique.(ABSTRACT TRUNCATED AT 400 WORDS)