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Vertebrate reproductive science and technology
RESEARCH ARTICLE

Boar sperm hyperactivated motility is induced by temperature via an intracellular calcium-dependent pathway

David Martin-Hidalgo A , Maria C. Gil A , Ana Hurtado de Llera A , Carlos J. Perez B , Maria J. Bragado A and Luis J. Garcia-Marin A C
+ Author Affiliations
- Author Affiliations

A Research Group of Intracellular Signaling and Technology of Reproduction (SINTREP), Research Institute in Biotechnology of Livestock and Game Management (INBIO G+C), University of Extremadura, Avda de la Universidad s/n, Caceres 10003, Spain.

B Biostatistics Unit, Department of Mathematics, Research Institute in Biotechnology of Livestock and Game Management (INBIO G+C), University of Extremadura, Avda de la Universidad s/n, Caceres 10003, Spain.

C Corresponding author. Email: ljgarcia@unex.es

Reproduction, Fertility and Development 30(11) 1462-1471 https://doi.org/10.1071/RD17549
Submitted: 26 December 2017  Accepted: 12 April 2018   Published: 30 May 2018

Abstract

Herein we describe a new protocol to induce boar sperm hypermotility: temperature-induced hypermotility (TIH). Briefly, spermatozoa stored at 17°C in a calcium-free Tyrode’s basal medium (containing EGTA) were exposed to increased temperature by incubation at 38.5°C. Hypermotility induced by the calcium ionophore A23187 was used as a control (calcium ionophore-induced hyperactivity (CIIH)). The increase in temperature led to an increase in the percentage of hypermotile spermatozoa. When the slope of the temperature increase is near zero, sperm hyperactivity becomes a more progressive movement. Motility parameters of sperm hyperactivation induced by TIH were different from those following CIIH. Cluster analysis revealed that these two populations of hyperactivated spermatozoa are different. TIH is independent of extracellular Ca2+ but dependent on intracellular Ca2+ release. Moreover, TIH is unaffected by protein kinase A (PKA) inhibition, whereas CIIH is reduced by half in the presence of a PKA inhibitor. In conclusion, we have demonstrated that: (1) a temperature increase in boar spermatozoa is a stimulus that can induce a hyperactive population, which is differs from the hyperactive sperm population induced by calcium ionophore; (2) the temperature increase in spermatozoa triggers the release of Ca2+ from intracellular stores; (3) extracellular calcium is not required for TIH; and (4) TIH in boar spermatozoa is independent of PKA activity.

Additional keywords: protein kinase A, spermatozoa.


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