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Control of Ca^(2+)- Influx by Ca^(2+)/Calmodulin Dependent Protein Kinase II in the Activation of Mouse Eggs

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초록

Change in intracellular Ca^(2+)-concentration ([Ca^(2+)]i) is an essential event for egg activation and further development. Ca^(2+) ion is originated from intracellular Ca^(2+)-store via inositol 1,4,5-triphosphate receptor and/or Ca^(2+) influx via Ca^(2+) channel. This study was performed to investigate whether changes in Ca^(2+)/calmodulin dependent protein kinase II (CaM KII) activity affect Ca^(2+) influx during artificial egg activation with ethanol using Ca^(2+) monitoring system and whole-cell patch clamp technique. Under Ca^(2+) ion-omitted condition, Ca^(2+)- oscillation was stopped within 30 min post microinjection of porcine sperm factor, and ethanol-induced Ca^(2+) increase was reduced. To investigate the role of CaM KII known as an integrator of Ca^(2+)- oscillation during mammalian egg fertilization, CaM KII activity was tested with a specific inhibitor KN-93. In the eggs treated with KN-93, ethanol failed to induce egg activation. In addition, KN-93 inhibited inward Ca^(2+) current (I_(ca)) in a time-dependent manner in whole-cell configuration. Immunostaining data showed that the voltage-dependent Ca^(2+) channels were distributed along the plasma membrane of mouse egg and 2-cell embryo. From these results, we suggest that Ca^(2+) influx during fertilization might be controlled by CaM KII activity.

Abstract

Change in intracellular Ca^(2+)-concentration ([Ca^(2+)]i) is an essential event for egg activation and further development. Ca^(2+) ion is originated from intracellular Ca^(2+)-store via inositol 1,4,5-triphosphate receptor and/or Ca^(2+) influx via Ca^(2+) channel. This study was performed to investigate whether changes in Ca^(2+)/calmodulin dependent protein kinase II (CaM KII) activity affect Ca^(2+) influx during artificial egg activation with ethanol using Ca^(2+) monitoring system and whole-cell patch clamp technique. Under Ca^(2+) ion-omitted condition, Ca^(2+)- oscillation was stopped within 30 min post microinjection of porcine sperm factor, and ethanol-induced Ca^(2+) increase was reduced. To investigate the role of CaM KII known as an integrator of Ca^(2+)- oscillation during mammalian egg fertilization, CaM KII activity was tested with a specific inhibitor KN-93. In the eggs treated with KN-93, ethanol failed to induce egg activation. In addition, KN-93 inhibited inward Ca^(2+) current (I_(ca)) in a time-dependent manner in whole-cell configuration. Immunostaining data showed that the voltage-dependent Ca^(2+) channels were distributed along the plasma membrane of mouse egg and 2-cell embryo. From these results, we suggest that Ca^(2+) influx during fertilization might be controlled by CaM KII activity.

참고문헌 (37)

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