Contractile effects of prostaglandins, oxytocin, and endothelin-1 in human myometrium in vitro: Refractoriness of myometrial tissue of pregnant women to prostaglandins E2 and F

R. Ann Word, Kristine E. Kamm, M. Linette Casey

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Abstract

Whereas there is much evidence in support of a role for prostaglandins (PC) in the parturitional process, it has not been demonstrated unequivocally that PGs are the physiological uterotonins involved in the induction of the myometrial contractions of spontaneous labor in women. This study was conducted to evaluate the contractile responsiveness of human myometrial tissue in vitro to PGs and to compare this response with that of other uterotonins, viz. oxytocin and endothelin-1. We found that treatment of uterine smooth muscle strips obtained from nonpregnant and pregnant women with PGE2 (10-8-10-6 M) caused a biphasic response characterized by an initial single contraction of increased amplitude and duration, followed by relaxation and a long period (10-15 min) of quiescence. Conversely, PGE2 acted in rat myometrium to cause a monophasic response of increased contractile frequency and force. Whereas uterine smooth muscle from nonpregnant women was responsive to PGF, the contractile responsiveness of myometrium from pregnant women was weak. This weak response to PGF, was found in myometrium of women in labor and in myometrium of women not in labor. 15-Methyl-PGF evoked a small response in myometrium from pregnant women. Under identical in vitro conditions, PGF (10-8-10-6 M) and 15-methyl-POF (10-6 M) caused sustained contractions in human vascular smooth muscle tissues (fetal aorta and arterial smooth muscle from chorionic vessels). Similarly, oxytocin and endothelin-1 (in myometrium from pregnant women) were effective in stimulating the force and frequency of myometrial contraction in vitro. We conclude that the myometrium of pregnant women, as evaluated in vitro, is refractory to the contractile effects of PGE2, and PGF.

Original languageEnglish (US)
Pages (from-to)1027-1032
Number of pages6
JournalJournal of Clinical Endocrinology and Metabolism
Volume75
Issue number4
StatePublished - 1992

Fingerprint

Dinoprost
Myometrium
Endothelin-1
Oxytocin
Dinoprostone
Prostaglandins
Pregnant Women
Muscle
Tissue
Personnel
Smooth Muscle
Uterine Contraction
Refractory materials
Rats
In Vitro Techniques
Vascular Smooth Muscle
Aorta
Muscles

ASJC Scopus subject areas

  • Biochemistry
  • Endocrinology, Diabetes and Metabolism

Cite this

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title = "Contractile effects of prostaglandins, oxytocin, and endothelin-1 in human myometrium in vitro: Refractoriness of myometrial tissue of pregnant women to prostaglandins E2 and F2α",
abstract = "Whereas there is much evidence in support of a role for prostaglandins (PC) in the parturitional process, it has not been demonstrated unequivocally that PGs are the physiological uterotonins involved in the induction of the myometrial contractions of spontaneous labor in women. This study was conducted to evaluate the contractile responsiveness of human myometrial tissue in vitro to PGs and to compare this response with that of other uterotonins, viz. oxytocin and endothelin-1. We found that treatment of uterine smooth muscle strips obtained from nonpregnant and pregnant women with PGE2 (10-8-10-6 M) caused a biphasic response characterized by an initial single contraction of increased amplitude and duration, followed by relaxation and a long period (10-15 min) of quiescence. Conversely, PGE2 acted in rat myometrium to cause a monophasic response of increased contractile frequency and force. Whereas uterine smooth muscle from nonpregnant women was responsive to PGF2α, the contractile responsiveness of myometrium from pregnant women was weak. This weak response to PGF2α, was found in myometrium of women in labor and in myometrium of women not in labor. 15-Methyl-PGF2α evoked a small response in myometrium from pregnant women. Under identical in vitro conditions, PGF2α (10-8-10-6 M) and 15-methyl-POF2α (10-6 M) caused sustained contractions in human vascular smooth muscle tissues (fetal aorta and arterial smooth muscle from chorionic vessels). Similarly, oxytocin and endothelin-1 (in myometrium from pregnant women) were effective in stimulating the force and frequency of myometrial contraction in vitro. We conclude that the myometrium of pregnant women, as evaluated in vitro, is refractory to the contractile effects of PGE2, and PGF2α.",
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AU - Word, R. Ann

AU - Kamm, Kristine E.

AU - Casey, M. Linette

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N2 - Whereas there is much evidence in support of a role for prostaglandins (PC) in the parturitional process, it has not been demonstrated unequivocally that PGs are the physiological uterotonins involved in the induction of the myometrial contractions of spontaneous labor in women. This study was conducted to evaluate the contractile responsiveness of human myometrial tissue in vitro to PGs and to compare this response with that of other uterotonins, viz. oxytocin and endothelin-1. We found that treatment of uterine smooth muscle strips obtained from nonpregnant and pregnant women with PGE2 (10-8-10-6 M) caused a biphasic response characterized by an initial single contraction of increased amplitude and duration, followed by relaxation and a long period (10-15 min) of quiescence. Conversely, PGE2 acted in rat myometrium to cause a monophasic response of increased contractile frequency and force. Whereas uterine smooth muscle from nonpregnant women was responsive to PGF2α, the contractile responsiveness of myometrium from pregnant women was weak. This weak response to PGF2α, was found in myometrium of women in labor and in myometrium of women not in labor. 15-Methyl-PGF2α evoked a small response in myometrium from pregnant women. Under identical in vitro conditions, PGF2α (10-8-10-6 M) and 15-methyl-POF2α (10-6 M) caused sustained contractions in human vascular smooth muscle tissues (fetal aorta and arterial smooth muscle from chorionic vessels). Similarly, oxytocin and endothelin-1 (in myometrium from pregnant women) were effective in stimulating the force and frequency of myometrial contraction in vitro. We conclude that the myometrium of pregnant women, as evaluated in vitro, is refractory to the contractile effects of PGE2, and PGF2α.

AB - Whereas there is much evidence in support of a role for prostaglandins (PC) in the parturitional process, it has not been demonstrated unequivocally that PGs are the physiological uterotonins involved in the induction of the myometrial contractions of spontaneous labor in women. This study was conducted to evaluate the contractile responsiveness of human myometrial tissue in vitro to PGs and to compare this response with that of other uterotonins, viz. oxytocin and endothelin-1. We found that treatment of uterine smooth muscle strips obtained from nonpregnant and pregnant women with PGE2 (10-8-10-6 M) caused a biphasic response characterized by an initial single contraction of increased amplitude and duration, followed by relaxation and a long period (10-15 min) of quiescence. Conversely, PGE2 acted in rat myometrium to cause a monophasic response of increased contractile frequency and force. Whereas uterine smooth muscle from nonpregnant women was responsive to PGF2α, the contractile responsiveness of myometrium from pregnant women was weak. This weak response to PGF2α, was found in myometrium of women in labor and in myometrium of women not in labor. 15-Methyl-PGF2α evoked a small response in myometrium from pregnant women. Under identical in vitro conditions, PGF2α (10-8-10-6 M) and 15-methyl-POF2α (10-6 M) caused sustained contractions in human vascular smooth muscle tissues (fetal aorta and arterial smooth muscle from chorionic vessels). Similarly, oxytocin and endothelin-1 (in myometrium from pregnant women) were effective in stimulating the force and frequency of myometrial contraction in vitro. We conclude that the myometrium of pregnant women, as evaluated in vitro, is refractory to the contractile effects of PGE2, and PGF2α.

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