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Tyrosine phosphorylation of a 95 kDa protein and induction of the acrosome reaction in human spermatozoa by recombinant human zona pellucida glycoprotein 3

Brewis, Ian Andrew 1998. Tyrosine phosphorylation of a 95 kDa protein and induction of the acrosome reaction in human spermatozoa by recombinant human zona pellucida glycoprotein 3. Molecular Human Reproduction 4 (12) , pp. 1136-1144. 10.1093/molehr/4.12.1136

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Abstract

Protein tyrosine phosphorylation and induction of the acrosome reaction (AR) in non-capacitated and capacitated human spermatozoa was investigated in response to recombinant human zona pellucida glycoprotein (rhZP3) produced by Chinese hamster ovary cells transfected with a plasmid containing human ZP3 cDNA. rhZP3-containing medium promoted the AR in a high proportion of capacitated spermatozoa (48.6 +/- 3.2%; P < 0.01) compared with control (no rhZP3) samples (14.8 +/- 2.1%). However, rhZP3-containing medium did not cause increased acrosomal exocytosis in non-capacitated spermatozoa (16.8 +/- 3.0%). Induction of the AR was associated with increased tyrosine phosphorylation of a 95 +/- 5 kDa epitope only in capacitated spermatozoa. A dose-dependent increase in the protein phosphorylation of a 95 kDa epitope in response to rhZP3 was detected by [gamma-32P]-ATP labelling of detergent-solubilized sperm proteins. When spermatozoa were co-incubated with monoclonal antibody 97.25 (mAb 97.25) recognizing a 95 kDa tyrosine kinase epitope, there was no rhZP3 induction of tyrosine phosphorylation of the 95 kDa protein. Such co-incubation also markedly inhibited the AR (23.9 +/- 3.1%). These results support the model that initial interaction of the fertilizing spermatozoon with ZP3 involves the tyrosine phosphorylation of a 95 kDa tyrosine kinase protein and that this requires capacitation.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Medicine
Subjects: Q Science > QH Natural history > QH301 Biology
R Medicine > RG Gynecology and obstetrics
Publisher: Oxford University Press
ISSN: 1460-2407
Last Modified: 04 Jun 2017 06:13
URI: http://orca-mwe.cf.ac.uk/id/eprint/57427

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