Effects of cryopreservation on the intracellular calcium concentration of human spermatozoa and its response to progesterone

E. A. McLaughlin, W. C.L. Ford

Research output: Contribution to journalArticle

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Abstract

The intracellular free calcium concentration [Ca2+]i of sperm from 23 ejaculates was measured before and after cryopreservation using the fluorescent probe Fura‐2. Spermatozoa were treated with 3.18 μM progesterone so that the regulation of [Ca2+]i in a dynamic situation could be studied. [Ca2+]i (nM) was 290 ± 13 in fresh spermatozoa vs. 550 ± 26 in cryopreserved samples (mean ± S.E.M. P < 0.0001 paired t‐test). Progesterone at a dose of 3.18 μM stimulated a large and rapid increase in [Ca2+]i to a peak value > 1 μM after 10–20 seconds. [Ca2+]i then declined to a slightly raised basal level over the next 30–40 seconds. This phenomenon occurred in all the fresh samples, but about half the frozen thawed samples failed to respond. The peak [Ca2+] attained by frozen samples which did respond after the addition of progesterone was similar to that observed with fresh sperm. The calcium channel blocker verapamil (200 μM) completely inhibited the transient rise in [Ca2+]i produced by progesterone, but 100 μM verapamil had only a partial effect. We conclude that (1) cryopreservation causes a substantial elevation of the [Ca2+]i in human spermatozoa and (2) damage to the plasma membrane during cryopreservation may result in the loss of the progesterone receptor. Both factors may contribute to the loss of fertility after cryopreservation. © 1994 Wiley‐Liss, Inc.

Original languageEnglish
Pages (from-to)241-246
Number of pages6
JournalMolecular Reproduction and Development
Volume37
Issue number2
DOIs
Publication statusPublished - Feb 1994
Externally publishedYes

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Cryopreservation
Progesterone
Spermatozoa
Calcium
Verapamil
Calcium Channel Blockers
Progesterone Receptors
Fluorescent Dyes
Fertility
Cell Membrane

Cite this

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abstract = "The intracellular free calcium concentration [Ca2+]i of sperm from 23 ejaculates was measured before and after cryopreservation using the fluorescent probe Fura‐2. Spermatozoa were treated with 3.18 μM progesterone so that the regulation of [Ca2+]i in a dynamic situation could be studied. [Ca2+]i (nM) was 290 ± 13 in fresh spermatozoa vs. 550 ± 26 in cryopreserved samples (mean ± S.E.M. P < 0.0001 paired t‐test). Progesterone at a dose of 3.18 μM stimulated a large and rapid increase in [Ca2+]i to a peak value > 1 μM after 10–20 seconds. [Ca2+]i then declined to a slightly raised basal level over the next 30–40 seconds. This phenomenon occurred in all the fresh samples, but about half the frozen thawed samples failed to respond. The peak [Ca2+] attained by frozen samples which did respond after the addition of progesterone was similar to that observed with fresh sperm. The calcium channel blocker verapamil (200 μM) completely inhibited the transient rise in [Ca2+]i produced by progesterone, but 100 μM verapamil had only a partial effect. We conclude that (1) cryopreservation causes a substantial elevation of the [Ca2+]i in human spermatozoa and (2) damage to the plasma membrane during cryopreservation may result in the loss of the progesterone receptor. Both factors may contribute to the loss of fertility after cryopreservation. {\circledC} 1994 Wiley‐Liss, Inc.",
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Effects of cryopreservation on the intracellular calcium concentration of human spermatozoa and its response to progesterone. / McLaughlin, E. A.; Ford, W. C.L.

In: Molecular Reproduction and Development, Vol. 37, No. 2, 02.1994, p. 241-246.

Research output: Contribution to journalArticle

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