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Sperm antioxidant defences decrease during epididymal transit from caput to cauda in parallel with increases in

Mashidur Rana1, Sudhir C Roy1, Bannur C Divyashree1

  • 1Molecular Biology Laboratory, Indian Council of Agricultural Research (ICAR) - National Institute of Animal Nutrition and Physiology, Hosur Road, Adugodi, Bangalore 560 030, Karnataka, India.

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Summary

Sperm antioxidant defenses decrease during epididymal transit, while epididymal fluid antioxidant capacity increases. This study reveals region-specific antioxidant modulation in the epididymis for sperm protection.

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Area of Science:

  • Reproductive Biology
  • Biochemistry
  • Spermatology

Background:

  • Epididymal transit is crucial for sperm maturation and acquisition of fertilizing capacity.
  • The role of antioxidant defenses in spermatozoa and epididymal fluid during transit remains largely unexplored.
  • Reactive oxygen species (ROS) can impair sperm function and viability.

Purpose of the Study:

  • To investigate the changes in antioxidant enzyme activities in spermatozoa and epididymal fluid during epididymal transit (caput to cauda).
  • To determine the regional differences in antioxidant capacity within the epididymis.
  • To understand the contribution of epididymal fluid to sperm protection against oxidative stress.

Main Methods:

  • Measurement of Cu,Zn-superoxide dismutase (Cu,Zn-SOD), catalase, and glutathione peroxidase (GPx) activities in spermatozoa and epididymal fluid from caput and cauda regions.
  • Assessment of total antioxidant capacity in epididymal fluid.
  • Detection of catalase in spermatozoa.

Main Results:

  • Spermatozoa showed a significant decrease in Cu,Zn-SOD and catalase activity from caput to cauda epididymis.
  • Epididymal fluid exhibited increased Cu,Zn-SOD, total SOD, and total GPx activity from caput to cauda.
  • Total antioxidant capacity was significantly higher in caudal epididymal fluid compared to caput fluid.
  • Catalase was identified in goat spermatozoa for the first time.

Conclusions:

  • Spermatozoa and epididymal fluid antioxidant defenses are modulated in a region-specific manner during epididymal transit.
  • The epididymal fluid provides an enhanced antioxidant environment in the cauda region for sperm storage and protection.
  • These findings suggest a compensatory mechanism by the epididymal fluid to manage ROS and support sperm viability.