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Cyclic AMP Effectors Regulate Myometrial Oxytocin Receptor Expression.

Angela Yulia1, Natasha Singh1, Kaiyu Lei1

  • 1Chelsea and Westminster Hospital (A.Y., N.S., K.L., S.R.S., M.R.J.), London SW10 9NH, United Kingdom; and Institute of Reproductive and Developmental Biology (A.Y., N.S., K.L., S.R.S., M.R.J.), London W12 0NN, United Kingdom.

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A decline in cyclic adenosine monophosphate/protein kinase A (cAMP/PKA) pathway activity initiates human labor by increasing oxytocin receptor (OTR) expression. This shift involves a switch from PKA to EPAC signaling in the myometrium.

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Area of Science:

  • Reproductive Biology
  • Molecular Endocrinology
  • Cellular Signaling

Background:

  • The precise molecular triggers for human labor onset remain largely unknown.
  • Cyclic adenosine monophosphate (cAMP) and its downstream effector, protein kinase A (PKA), are implicated in regulating uterine contractility.

Purpose of the Study:

  • To test the hypothesis that a decline in cAMP/PKA pathway function initiates human labor.
  • To investigate the role of cAMP-mediated signaling in regulating oxytocin receptor (OTR) expression in the myometrium.

Main Methods:

  • Identification and expression analysis of myometrial cAMP/PKA-responsive genes during pregnancy and labor.
  • In vitro studies using siRNA, agonists, and antagonists to elucidate cAMP effector mechanisms on OTR expression.
  • Assessment of PKA and Epac1 levels and activity in myometrial samples and cells exposed to mechanical stretch and inflammatory stimuli.

Main Results:

  • Oxytocin receptor (OTR) was identified as a cAMP-repressed gene; its expression increased with labor onset.
  • In vitro, cAMP/PKA signaling decreased OTR expression, while cAMP/EPAC signaling increased it.
  • Myometrial samples from early labor showed reduced PKA activity and increased Epac1 levels, correlating with higher OTR expression.

Conclusions:

  • A reduction in cAMP/PKA pathway activity occurs at the onset of human labor.
  • This pathway shift is critical for regulating myometrial OTR expression.
  • The findings suggest a switch in cAMP signaling from PKA to EPAC mediates the transition from myometrial quiescence to activation during labor.