当前位置： SCI文献检索 > DEVELOPMENTAL BIOLOGY期刊下所有文献 > Serotonin-induced meiosis reinitiation from the first prophase and from the first metaphase in oocytes of the marine bivalve Hiatella flaccida: respective changes in intracellular Ca2+ and pH.

Serotonin-induced meiosis reinitiation from the first prophase and from the first metaphase in oocytes of the marine bivalve Hiatella flaccida: respective changes in intracellular Ca2+ and pH.

Abstract：

:In the marine bivalve Hiatella flaccida, full-grown oocytes in ovaries are arrested at the first prophase (prophase-I) of meiosis, whereas spawned oocytes have reinitiated meiosis from prophase-I and are again arrested at the first metaphase (metaphase-I). The neurohormone serotonin (5-hydroxytryptamine, 5-HT) was able to trigger meiosis reinitiation both from prophase-I and from metaphase-I. Exposure of prophase-I oocytes to 5-HT caused an increase in intracellular Ca2+ ([Ca2+]i) composed of an initial towering transient and a following lower but sustained elevation. 5-HT-stimulated prophase-I oocytes also showed a gradual rise in intracellular pH (pHi), reaching a plateau level. None of these 5-HT-induced responses was affected by the complete absence of external Ca2+. On the other hand, these responses were suppressed by preinjection of heparin, an antagonist of inositol 1,4,5-trisphosphate-sensitive receptors. Metaphase-I oocytes also exhibited a [Ca2+]i increase in response to 5-HT; the initial [Ca2+]i transient was larger than that in prophase-I oocytes when stimulated with the same 5-HT concentration. Furthermore, after the initial transient, the elevated [Ca2+]i was not sustained but sometimes returned to the prestimulus level and then increased again. Metaphase-I oocytes had higher resting pHi levels than prophase-I oocytes and showed no significant pHi changes after addition of 5-HT. These results suggest that both a [Ca2+]i increase and a pHi rise are responsible for the release from prophase-I arrest, while a [Ca2+]i increase alone is concerned with the release from metaphase-I arrest.

journal_name

Dev Biol

journal_title

Developmental biology

authors

Deguchi R,Osanai K

doi

10.1006/dbio.1995.1298

subject

Has Abstract

pub_date

1995-10-01 00:00:00

pages

483-96

issue

2

eissn

0012-1606

issn

1095-564X

pii

S0012-1606(85)71298-5

journal_volume

171

pub_type

杂志文章

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