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- W1971429829 abstract "In order to evaluate the expression of the opioid precursor proopiomelanocortin (POMC) in the ovarian follicle, we measured 6 of its main end-products in 23 follicular fluids. We coupled high performance liquid chromatography (HPLC) to specific radioimmunoassays. Seven follicles were immature (diameter less than 9 mm), 10 were obtained from superovulated patients during an in vitro fertilization-embryo transfer program (greater than 22 mm) and six were persistent follicles, collected during the luteal phase [15-31 mm, luteinized unruptured follicles (LUF)]. Follicular fluids were extracted by mean of Sep-pak cartridges and then purified by HPLC with a reverse-phase C-18 column eluted in a linear gradient with acetonitrile/0.01 M hydrochloric acid (from 18:82 to 40:60). Fractions were tested with specific antisera for ACTH (1-39), alpha-MSH, beta-lipotropin (beta-LPH), beta-endorphin (beta-EP) and gamma-endorphin (gamma-EP) immunoreactivities. No presence of beta-LPH, beta-EP and ACTH was confirmed, while gamma-EP, alpha-MSH and des-alpha-MSH were detected for the first time in follicular fluid. In every class of follicles shorter chain peptides predominate over their longer chain precursor. Immature follicles are characterized by the highest amounts of gamma-EP, ACTH, alpha-MSH and des-alpha-MSH if compared to superovulated and LUF. On the contrary, beta-EP amount was highest after superovulation. Apart from this finding, peptide levels in superovulated patients and LUF are similar.(ABSTRACT TRUNCATED AT 250 WORDS)" @default.
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- W1971429829 date "1988-09-01" @default.
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- W1971429829 title "Expression of proopiomelanocortin-related peptides in human follicular fluid" @default.
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- W1971429829 doi "https://doi.org/10.1016/0196-9781(88)90094-0" @default.
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