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Calcitonin, angiotensin II and FPP significantly modulate mouse sperm function
L R Fraser1, M D Pondel, G P Vinson
1Endocrinology and Reproduction Research Group, School of Biomedical Sciences, King's College London, Guy's Campus, London Bridge, London SE1 1UL, UK. lynn.fraser@kcl.ac.uk
Molecular Human Reproduction
|March 3, 2001
Summary
Fertilization-promoting peptide (FPP), calcitonin, and angiotensin II stimulate sperm capacitation via the adenylyl cyclase/cAMP pathway. These peptides may interact within seminal plasma to regulate sperm function and fertilization potential.
Area of Science:
- Reproductive Biology
- Molecular Endocrinology
- Sperm Physiology
Background:
- Fertilization-promoting peptide (FPP) modulates sperm capacitation through the adenylyl cyclase (AC)/cAMP pathway.
- Calcitonin and angiotensin II are present in seminal plasma and may influence sperm function.
- Sperm capacitation is a crucial process for fertilization, involving complex signaling pathways.
Purpose of the Study:
- To investigate the effects of FPP, calcitonin, and angiotensin II on uncapacitated and capacitated mouse spermatozoa.
- To determine if these peptides interact or act on the same signaling pathway.
- To elucidate the role of these peptides in regulating sperm function and fertilization.
Main Methods:
- Spermatozoa capacitation assessed using chlortetracycline (CTC) fluorescence.
- In vitro fertilization assays were performed.
- Responses to individual peptides and combinations were analyzed.
- Cyclic AMP (cAMP) production and pertussis toxin-sensitive inhibition were investigated.
Main Results:
- Calcitonin, angiotensin II, and FPP significantly stimulated capacitation in uncapacitated spermatozoa.
- Combinations of peptides showed enhanced stimulatory effects compared to individual peptides.
- FPP and calcitonin inhibited spontaneous acrosome loss in capacitated cells, suggesting involvement of inhibitory G proteins.
- Angiotensin II did not affect spontaneous acrosome loss but did not interfere with FPP/calcitonin inhibition.
Conclusions:
- Angiotensin II, calcitonin, and FPP likely modulate the AC/cAMP signal transduction pathway in spermatozoa.
- These peptides may collectively regulate sperm capacitation and acrosome reaction.
- Further research is needed to fully elucidate the precise mechanisms of action.