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Estrogen modulation of cortical spreading depression.

Chiho Kudo1,2, Andrea M Harriott1,3, Michael A Moskowitz1

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Female rats exhibit higher cortical spreading depression (CSD) susceptibility than males. Estrogen withdrawal significantly increases CSD frequency in females, potentially linking to migraine triggers.

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Area of Science:

  • Neuroscience
  • Endocrinology
  • Migraine Pathophysiology

Background:

  • Cortical spreading depression (CSD) is implicated in migraine aura and headache.
  • Migraine is more common in women, potentially linked to female hormones.
  • The role of sex hormones in CSD susceptibility requires further investigation.

Purpose of the Study:

  • To investigate the influence of sex, gonadectomy, and female hormone manipulation on CSD susceptibility.
  • To explore potential mechanisms by examining glutamate and GABA receptor binding.

Main Methods:

  • CSD frequency was measured in intact and gonadectomized male and female rats.
  • Hormone supplementation (estrogen, progesterone) and withdrawal protocols were employed.
  • Glutamate and GABAA receptor binding was assessed using autoradiography.

Main Results:

  • Intact female rats showed higher CSD frequency than intact males and ovariectomized rats.
  • Estrogen withdrawal after treatment significantly increased CSD frequency in gonadectomized females.
  • Progesterone treatment elevated CSD susceptibility, with partial normalization upon withdrawal.

Conclusions:

  • Females are more susceptible to CSD, with sex differences diminished by gonadectomy.
  • Estrogen withdrawal enhances CSD susceptibility, offering insights into estrogen-withdrawal migraine.
  • Hormonal influences on CSD warrant further study, independent of receptor binding changes observed.