NDLI: Temperature-dependent regulation of sperm motility of Ijima's copper pheasants (Syrmaticus soemmerringii ijimae), one of ‘near threatened’ species

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Temperature-dependent regulation of sperm motility of Ijima's copper pheasants (Syrmaticus soemmerringii ijimae), one of ‘near threatened’ species

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Ashizawa, Koji Kawaji, Noritomo Nakamura, Shunichi Nagase, Daigo Tatemoto, Hideki Katayama, Seiichi Narumi, Kazunori Tsuzuki, Yasuhiro
Description	Country affiliation: Japan Author Affiliation: Ashizawa K ( Laboratory of Animal Reproduction, Faculty of Agriculture, University of Miyazaki, Gakuen-Kibanadai-Nishi, Miyazaki, Japan. ashizawa@cc.miyazaki-u.ac.jp)
Abstract	In order to conserve the copper pheasants, one of the Japanese 'near threatened' species, the knowledge of the sperm characteristics is the inevitable issue. Therefore, temperature-dependent regulation of copper pheasant sperm motility was investigated in comparison with that of domestic fowl spermatozoa. Motility of intact spermatozoa from both species was markedly affected by temperature. During incubation at 30 degrees C, copper pheasant spermatozoa showed around 60-70% motility, but became almost immotile when the temperature was raised to 40 degrees C. Then, when the temperature of the sperm suspension was subsequently cooled to 30 degrees C, the spermatozoa regained their motility. The motility of domestic fowl spermatozoa showed a similar pattern. Temperature also affected the motility of both demembranated copper pheasant and domestic fowl spermatozoa in the same way. The motility of intact copper pheasant and domestic fowl spermatozoa at 30 degrees C was unaffected following the addition of 2 mM CaCl(2), 100 nM calyculin A, an inhibitor of protein phosphatase-type 1 (PP1), or 4 mM diB-cAMP, respectively, compared with those with no effectors. However, the presence of 10 microM ML-7, a selective inhibitor of myosin light chain kinase (MLCK), inhibited motility of spermatozoa from both species. At 40 degrees C, the presence of CaCl(2) or calyculin A restored the motility of spermatozoa from both species, but the addition of diB-cAMP or ML-7 could not prevent the immobilization of spermatozoa. At 30 degrees C in the presence of ATP, the motility of demembranated copper pheasant spermatozoa was over 60% but was inhibited following the addition of 10 microM ML-7; a similar pattern was found with demembranated domestic fowl sperm motility. The motility of demembranated spermatozoa from both species was inhibited following the addition of 2mM EGTA to the reactivation medium at 30 degrees C, but restored by the subsequent addition of 4 mM CaCl(2). These results suggest that copper pheasant sperm motility might be regulated by similar mechanisms to that of domestic fowl spermatozoa: i.e., the balance of Ca(2+)/MLCK or an MLCK-like protein-dependent phosphorylation and PP1-dependent dephosphorylation. The similarity in physiological regulation of spermatozoa from both species shows that extensive technology developed for artificial breeding of the domestic fowl might be applicable to captive breeding of copper pheasants.
File Format	HTM / HTML
ISSN	03784320
Issue Number	1-2
Volume Number	121
e-ISSN	18732232
Journal	Animal Reproduction Science
Language	English
Publisher	Elsevier
Publisher Date	2010-08-01
Publisher Place	Netherlands
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Discipline Animal science Discipline Reproductive Medicine Discipline Veterinary Medicine Discipline Zoology Endangered Species Galliformes Physiology Sperm Motility Temperature Animals Calcium Chloride Pharmacology Chickens Cyclic Amp Male Oxazoles Semen Drug Effects Comparative Study Journal Article Research Support, Non-u.s. Gov't
Content Type	Text
Resource Type	Article
Subject	Medicine Animal Science and Zoology Endocrinology Food Animals

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Temperature-dependent regulation of sperm motility of Ijima's copper pheasants (Syrmaticus soemmerringii ijimae), one of ‘near threatened’ species

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Temperature-dependent regulation of sperm motility of Ijima's copper pheasants (Syrmaticus soemmerringii ijimae), one of ‘near threatened’ species