TY  - JOUR
TI  - Regulation of the starfish sperm acrosome reaction by cGMP, pH, cAMP and Ca<sup>2+</sup>
AU  - Matsumoto, Midori
AU  - Kawase, Osamu
AU  - Islam, M. Sadiqul
AU  - Naruse, Masahiro
AU  - Watanabe, Shin-Nosuke
AU  - Ishikawa, Riho
AU  - Hoshi, Motonori
T2  - The International Journal of Developmental Biology
AB  - In the starfish, Asterias amurensis, three components in the jelly coat of eggs, namely acrosome reaction-inducing substance (ARIS), Co-ARIS and asterosap, act in concert on homologous spermatozoa to induce the acrosome reaction (AR). Molecular recognition between the sperm surface molecules and the egg jelly molecules must underlie signal transduction events triggering the AR. Asterosap is a sperm-activating molecule, which stimulates rapid synthesis of intracellular cGMP, pH and Ca2+. This transient elevation of Ca2+ level is caused by a K+-dependent Na+/Ca2+ exchanger, and the increase of intracellular pH is sufficient for ARIS to induce the AR. The concerted action of ARIS and asterosap could induce elevate intracellular cAMP levels in starfish sperm and the sustained increase in [Ca2+], which is essential for the AR. The signaling pathway induced by these factors seems to be synergistically regulated to trigger the AR in starfish sperm.
PY  - 2008
DO  - 10.1387/ijdb.072511mm
VL  - 52
IS  - 5-6
SP  - 523
EP  - 526
J2  - Int. J. Dev. Biol.
LA  - en
SN  - 0214-6282
SN  - 1696-3547
UR  - https://ijdb.ehu.eus/article/072511mm
Y2  - 2024/11/05/15:24:11
ER  -