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- W2016031383 abstract "ABSTRACT: While Sperm adhesion molecule 1 (SPAM1) is the highly conserved mammalian sperm hyaluronidase (hyase), multiple hyases are present in the mouse testis. In this study we show that one of the murine hyases, Hyalp1, which is predominantly expressed in the testis in a 24-kd isoform has neutral enzymatic activity. On sperm, Hyalp1 is localized on the plasma membrane of the anterior head and was shown to have neutral hyase activity for an isoform of ∼55–56 kd, contributing modestly to the overall neutral hyase activity. This activity is associated with in vitro cumulus penetration, since antibody inhibition of Hyalp1 significantly (P = .034) retarded the rate of penetration of wild-type (WT) sperm. Antibody-inhibited Spam1 null sperm were more severely retarded (P = 4.2 × 10−19), suggesting an up-regulation of Hyalp1 in these mice. A functionality test of the hyaluronic acid (HA) receptor domain identified in the N-terminus by in silico analysis revealed that sperm Hyalp1 is significantly (P = .006) involved in the progesterone-induced HA-enhanced acrosome reaction. Finally, developmental reverse transcription polymerase chain reaction (RT-PCR) shows that testicular transcripts of Hyalp1 are detected as early as 6 days postparturition, similar to transcripts for Spam1, suggesting that the gene might also play a role in the developing testes prior to spermiogenesis. Taken together, the findings reveal that Hyalp1 likely has a unique function in the adult testis, and redundant overlapping ones with Spam1 and may compensate for it in Spam1 null mice." @default.
- W2016031383 created "2016-06-24" @default.
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- W2016031383 date "2006-09-20" @default.
- W2016031383 modified "2023-10-16" @default.
- W2016031383 title "Hyalp1 in Murine Sperm Function: Evidence for Unique and Overlapping Functions With Other Reproductive Hyaluronidases" @default.
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- W2016031383 doi "https://doi.org/10.2164/jandrol.106.000356" @default.
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