DOI QR코드

DOI QR Code

Voltage Dependent N Type Calcium Channel in Mouse Egg Fertilization

  • 투고 : 2020.11.26
  • 심사 : 2020.12.10
  • 발행 : 2020.12.31

초록

Repetitive changes in the intracellular calcium concentration ([Ca2+]i) triggers egg activation, including cortical granule exocytosis, resumption of second meiosis, block to polyspermy, and initiating embryonic development. [Ca2+]i oscillations that continue for several hours, are required for the early events of egg activation and possibly connected to further development to the blastocyst stage. The sources of Ca2+ ion elevation during [Ca2+]i oscillations are Ca2+ release from endoplasmic reticulum through inositol 1,4,5 tri-phosphate receptor and Ca2+ ion influx through Ca2+ channel on the plasma membrane. Ca2+ channels have been characterized into voltage-dependent Ca2+ channels (VDCCs), ligand-gated Ca2+ channel, and leak-channel. VDCCs expressed on muscle cell or neuron is specified into L, T, N, P, Q, and R type VDCs by their activation threshold or their sensitivity to peptide toxins isolated from cone snails and spiders. The present study was aimed to investigate the localization pattern of N and P/Q type voltage-dependent calcium channels in mouse eggs and the role in fertilization. [Ca2+]i oscillation was observed in a Ca2+ contained medium with sperm factor or adenophostin A injection but disappeared in Ca2+ free medium. Ca2+ influx was decreased by Lat A. N-VDCC specific inhibitor, ω-Conotoxin CVIIA induced abnormal [Ca2+]i oscillation profiles in SrCl2 treatment. N or P/Q type VDC were distributed on the plasma membrane in cortical cluster form, not in the cytoplasm. Ca2+ influx is essential for [Ca2+]i oscillation during mammalian fertilization. This Ca2+ influx might be controlled through the N or P/Q type VDCCs. Abnormal VDCCs expression of eggs could be tested in fertilization failure or low fertilization eggs in subfertility women.

키워드

과제정보

This research was supported by a grant from National Research Foundation of Korea (NRF-2017 R1D1A1B03028155 and NRF-2018R1D1A1B07043250).

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