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Serotonergic Mechanisms of Oocyte Germinal Vesicle Breakdown in the Mud Crab, Scylla paramamosain.
- Source :
- Frontiers in Physiology; 6/19/2019, pN.PAG-N.PAG, 8p
- Publication Year :
- 2019
-
Abstract
- The mechanism of serotonin (5-HT)-induced oocyte germinal vesicle breakdown (GVBD) in the mud crab, Scylla paramamosain , was investigated in this study. Histological staining showed that there were two meiotic arrests in oocyte, appearing at prophase I and metaphase I. This result indicated that meiosis I arrest at prophase I in S. paramamosain was similar to that of vertebrates, but meiosis II arrest at metaphase I was different from that of vertebrates. Resumption of oocytes arrest at meiosis prophase I could be induced by 5-HT rapidly within 5 min in S. paramamosain. We obtained the sequence of the 5-HT receptor type 1A (5-HTR<subscript>1A</subscript>) from the NCBI database, and found that 5-HTR<subscript>1A</subscript> was expressed in oocytes and follicle cells. In addition, we found that an agonist 8-OH-DPAT which binds 5-HTR<subscript>1A</subscript> induced GVBD and an antagonist WAY100635 which inhibited 5-HT induced GVBD in S. paramamosain. This result showed that 5-HTR<subscript>1A</subscript> mediated the regulation of oocyte GVBD by 5-HT. To explore the functional mechanism of 5-HT in inducing oocyte GVBD, forskolin, a cAMP agonist was used. Results showed that, forskolin significantly blocked 5-HT-induced GVBD, and there was a negative correlation between GVBD rate and cAMP level. Our data indicate that there are two meiotic arrests in S. paramamosain , and the resumption of prophase I arrest can be induced by 5-HT, which binds to 5-HTR<subscript>1A</subscript> , and this process is mediated by cAMP, which acts as negative regulator via cAMP signaling pathway. [ABSTRACT FROM AUTHOR]
- Subjects :
- OVUM
GERMINAL vesicles
SCYLLA (Crustacea)
SEROTONIN
MEIOSIS
Subjects
Details
- Language :
- English
- ISSN :
- 1664042X
- Database :
- Complementary Index
- Journal :
- Frontiers in Physiology
- Publication Type :
- Academic Journal
- Accession number :
- 137072413
- Full Text :
- https://doi.org/10.3389/fphys.2019.00797