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  • Ortega Ferrusola, C., et al. (författare)
  • Stallion spermatozoa surviving freezing and thawing experience membrane depolarization and increased intracellular Na
  • 2017
  • Ingår i: Andrology. - : WILEY. - 2047-2919 .- 2047-2927. ; 5:6, s. 1174-1182
  • Tidskriftsartikel (refereegranskat)abstract
    • In order to gain insight of the modifications that freezing and thawing cause to the surviving population of spermatozoa, changes in the potential of the plasma membrane (Em) and intracellular Na+ content of stallion spermatozoa were investigated using flow cytometry. Moreover, caspase 3 activity was also investigated and the functionality of the Na+-K+ ATPase pump was investigated before and after freezing and thawing. Cryopreservation caused a significant (pamp;lt;0.001) increase in the subpopulation of spermatozoa with depolarized sperm membranes, concomitantly with an increase (pamp;lt;0.05) in intracellular Na+. These changes occurred in relation to activation of caspase 3 (pamp;lt;0.001). Cryopreservation reduced the activity of the Na-K+ pump and inhibition of the Na+-K+ ATPase pump with ouabain-induced caspase 3 activation. It is concluded that inactivation of Na+-K+ ATPase occurs during cryopreservation, an inhibition that could play a role explaining the accelerated senescence of the surviving population of spermatozoa.
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