Catecholamines are not linked to myometrial phospholipase C and uterine contraction in late pregnant and parturient mouse

Uterine contraction in late pregnant and parturient mice is associated with oxytocin, which increased contraction by 400% at 1 microM concentration.

• Catecholamines, through activation of alpha(1)-adrenergic receptors, do not influence uterine contraction in late pregnancy or parturition.
• Oxytocin significantly increased inositol phosphate production in a dose-dependent manner, indicating its role in myometrial activation.
• Only oxytocin, and not noradrenaline or phenylephrine, was effective in recruiting specific enzymes (PLCbeta(1) and PLCbeta(3)) to the myometrial membrane.
• The findings suggest a potential difference in uterine contraction mechanisms between mice and other mammals during late pregnancy.

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