Rod Outer Segment Membrane Guanylate Cyclase Type 1 (ROS-GC1) Calcium-modulated Transduction System in the Sperm
Overview
Affiliations
Objective: Evaluation of the presence of a Ca(2+)-regulated membrane guanylate cyclase signal transudation system in the spermatozoa.
Design: Experimental study.
Setting: Research university laboratory.
Patient(s): Human sperm obtained from healthy donors who met the criteria of the World Health Organization for normozoospermia and bovine semen collected from bulls of proven fertility.
Intervention(s): Radioimmunoassay and immunohistochemistry of human and bovine spermatozoa.
Main Outcome Measure(s): The membrane guanylate cyclase activity and the presence of membrane guanylate cyclase transduction machinery components in the spermatozoa.
Result(s): The identity of a Ca(2+)-modulated membrane guanylate cyclase transduction machinery in human and bovine spermatozoa has been documented. The machinery is both inhibited and stimulated within nanomolar to semimicromolar range of free Ca(2+). The transduction component of this machinery is the rod outer segment membrane guanylate cyclase type 1 (ROS-GC1). The enzyme coexists with three Ca(2+)-dependent modulators: guanylate cyclase activating protein type 1 (GCAP1), S100B and neurocalcin delta. ROS-GC1 and its modulators are present in the heads and tails of both species' spermatozoa.
Conclusion(s): The coexpression of ROS-GC1 and its activators in spermatozoa suggests that the Ca(2+)-modulated ROS-GC1 transduction system may be a part of the fertilization machinery.
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PMID: 34344298 PMC: 8335898. DOI: 10.1186/s12864-021-07904-8.
Ca(2+)-modulated ROS-GC1 transduction system in testes and its presence in the spermatogenic cells.
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PMID: 24808824 PMC: 4010774. DOI: 10.3389/fnmol.2014.00034.
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Ca(2+)-modulated membrane guanylate cyclase in the testes.
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