Reception and transduction of the serotonin signal responsible for meiosis reinitiation in oocytes of the Japanese clam Ruditapes philippinarum.

Abstract:

:Prophase-arrested oocytes of Ruditapes philippinarum are triggered to undergo germinal vesicle breakdown under the influence of the neurohormone serotonin (5HT) and then arrest in metaphase 1. Our data show that these oocytes possess a single class of original 5HT receptors. Their binding parameters have been determined on semipurified membrane preparations incubated with [3H]5HT. No significant differences were observed when comparing 5HT-competent and -incompetent batches as well as prophase- or metaphase-arrested oocytes. Specific experiments including incubation with mastoparan or mas 7, GTP iontophoresis, and IP3 quantification strongly suggest that these receptors must be coupled with G-proteins to be functional. Peak change in IP3 mass occurs at 3 min and is likely to trigger the 5HT-dependent Ca2+ transient that begins at this time. In metaphase-arrested oocytes, binding of 5HT to its receptors no longer produces a Ca2+ surger. This is likely to result from a negative retrocontrol loop which would involve kinase C and exert its effect upstream of the Ca2+ surge. Indeed, the phorbol ester PMA proved able to reduce the Ca2+ response and to block 5HT action when applied during the first 3 min corresponding to the hormone-dependent period. Such an inhibition was reversed in the presence of 5 microM of the C kinase inhibitor GF109203X and could be bypassed by ionophore, ammonia, and thapsigargin, which trigger a receptor-independent Ca2+ surge.

journal_name

Dev Biol

journal_title

Developmental biology

authors

Gobet I,Durocher Y,Leclerc C,Moreau M,Guerrier P

doi

10.1006/dbio.1994.1222

subject

Has Abstract

pub_date

1994-08-01 00:00:00

pages

540-9

issue

2

eissn

0012-1606

issn

1095-564X

pii

S0012-1606(84)71222-X

journal_volume

164

pub_type

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