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Localization of met-enkephalin on human spermatozoa and evidence for its physiological role
Abstract:
Pro-opio-melano-cortino-derived peptides have been identified in rat testicular extracts and in human seminal plasma, but their physiological role is still unknown. We report that met-enkephalin is localized on human spermatozoa, by means of an indirect immunofluorescent technique. Furthermore, we demonstrate that a met-enkephalin analog (D-Ala2-Mephe4-Met-(o)-ol-enkephalin, FK 33-824, Sandoz, Basel, Switzerland: DAMME) inhibits in a dose-dependent manner the acrosome reaction induction. The hypothesis of a physiological role of seminal met-enkephalin on human spermatozoa fertilizing ability is briefly discussed.
Insights
Seminal met-enkephalin is found on human sperm and can inhibit the acrosome reaction. This suggests a potential physiological role for seminal met-enkephalin in human sperm function.
Area of Science:
- Reproductive biology
- Endocrinology
- Peptide research
Background:
- Pro-opiomelanocortin-derived peptides are present in rat testes and human seminal plasma.
- The physiological function of these peptides in human reproduction remains unclear.
Purpose of the Study:
- To investigate the localization of met-enkephalin on human spermatozoa.
- To determine the effect of a met-enkephalin analog on sperm acrosome reaction induction.
Main Methods:
- Indirect immunofluorescence was used to localize met-enkephalin on human spermatozoa.
- The acrosome reaction was induced in the presence of a synthetic met-enkephalin analog (DAMME).
Main Results:
- Met-enkephalin was successfully localized on human spermatozoa.
- The synthetic met-enkephalin analog (DAMME) demonstrated a dose-dependent inhibition of acrosome reaction induction.
Conclusions:
- Seminal met-enkephalin is present on human spermatozoa.
- Met-enkephalin may play a physiological role in regulating human sperm fertilizing ability, specifically by influencing the acrosome reaction.