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Area of Science:

  • Reproductive Biology
  • Cellular Physiology
  • Developmental Biology

Background:

  • Egg activation, crucial for fertilization, relies on calcium (Ca2+) oscillations.
  • Maternal age is linked to declining egg quality and reproductive success.

Purpose of the Study:

  • To investigate the impact of maternal aging on intracellular Ca2+ dynamics during egg activation in mice.
  • To determine if age-related changes in Ca2+ handling affect fertilization or artificial activation.

Main Methods:

  • Examined Ca2+ dynamics in eggs from young and naturally aged mice.
  • Utilized intracytoplasmic sperm injection (ICSI) and parthenogenetic activation (SrCl2).
  • Measured intracellular Ca2+ concentration ([Ca2+]i) and Ca2+ store replenishment.

Main Results:

  • Intracellular Ca2+ stores and resting [Ca2+]i were unaffected by maternal age.
  • Aged eggs showed impaired ability to replenish Ca2+ stores after depletion.
  • Ca2+ oscillation patterns during sperm-induced activation remained largely unchanged with age.
  • Parthenogenetic activation with SrCl2 revealed significantly reduced Ca2+ oscillation frequency and duration in aged eggs.

Conclusions:

  • Advancing maternal age does not significantly alter the egg's ability to respond to fertilization-induced Ca2+ signals.
  • Subtle age-related changes in Ca2+ handling primarily affect responses to artificial parthenogenetic activation methods.
  • These findings highlight potential differences in egg activation mechanisms and their age-dependent alterations.