Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: UNIPROT:P01178 (oxytocin)
 15,767 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Prostaglandin F-2 alpha was applied intrapartum in 104 women who (1) had indications for induction of labor (32 of them had premature rupture of the amniotic sac) and (2) had already received ineffective infusions of oxytocin. 80 women (77%) had vaginal deliveries; 24 had to have caesarean sections. Of these 24, however, only 9 were without strong obstetric indications for caesarean section (such as fetal heartbeat, fetal acidity, or intrapartum fever). 75 of the subjects were primiparae; the age range was 16-43. The prostaglandin was in a solution of 10-15 mcg/ml; the infusion rate was 5-22.5 mcg/minute. The mean time from infusion to birth was 180 minutes; mean time from 5-cm cervical dilation to birth was 114 minutes (cervical dilation was 2-3 cm at the beginning of prostaglandin application). No harmful effect on the state of the newborn was observed, as Apgar pH scores were similar to those of children born after spontaneous labor.
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PMID:[Experiences on the effectivity of prostaglandin F2alpha during labor after insufficient effect of oxytocin]. 1 1

Oxytocin, elevated estrogen-progesterone ratio, fetal corticosteroids, prostaglandins, catecholamines, and changes in uterine blood flow have all been implicated as triggers of labor. In approximately one-third of cases of threatened premature labor contractions stop spontaneously. Thus placebo-controlled randomized trials of any new drug for inhibition of premature labor are necessary, as the spontaneous cessation of contractions always favors the claimed therapeutic efficacy. Alcohol inhibits the release of endogenous oxytocin and has an additional direct effect on the myometrium. In one study alcohol was more effective than placebo in the postponement of delivery. Isoxsuprine, ritodrine, and terbutaline have also been shown to be better than placebo in the inhibition of premature labor, and the beta adrenergic agents appear to be more effective than alcohol. Prostaglandin inhibitors such as indomethacin are currently under investigation. Success is correlated with early administration of the therapy, which requires treating some patients whose contractions might have stopped spontaneoulsy. As different factors may be involved in triggering premature labor, if one therapeutic approach fails another should be initiated promptly.
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PMID:The pharmacologic inhibition of premature labor. 2

Vaginal pessaries containing 3 mg of prostaglandin E2 were used to induce labour in 200 patients with variable induction features. Prostaglandin-induced labour was augmented where necessary by synthetic oxytocin. There was on failed induction. Only 23% of patients with favourable induction features and 53% of patients with unfavourable features needed oxytocin. There were no adverse fetal or maternal effects. The prostaglandin E2 pessary was as effective in inducing labour as 350 microgram extra-amniotic prostaglandin E2 in tylose in a comparable group of 200 patients in which there were 4 failed inductions.
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PMID:Prostaglandin E, pessaries for induction of labour. 8 63

Prostaglandins (PGs) of type F2 alpha, E1, and E2 have been reported both, to inhibit or to facilitate posterior pituitary oxytocin release in lactating animals and women, and to suppress or to stimulate the mammary myoepithelium. Prostaglandin-induced milk ejection in women and cows has been attributed to central oxytocin release, but no oxytocin blood levels were determined. Moreover, for lactating cows, sows, rabbits, guinea pigs, and rats a direct PG effect on the mammary myoepithelium resulting in milk ejection has been suggested. On the other hand, PGs were found to antagonize the milk-ejection response to oxytocin in rabbits and rats. The mechanisms involved in PG synergism or antagonism of oxytocin-induced milk ejection are not understood. Studies in lactating rats showed that blood pressure active PG doses of F2 alpha, E1, and E2 largely inhibited the intramammary pressure response to oxytocin. Whereas the oxytocin-antagonistic action of PGF2 alpha was not affected by adrenergic blockers (phenoxybenzamine, propranolol), the anti-oxytocin effects of PGE1 and E2 were eliminated after alpha-receptor blockade while the activity of oxytocin increased. Under beta-receptor or alpha- plus beta-receptor blockade, the oxytocin-inhibitory effects of PGE1 and E2 were almost abolished. Mechanisms of PG-induced inhibition of the oxytocin response may involve mammary vascular changes and/or alterations in myoepithelial activity of cyclic adenosine-3,5-monophosphate (c-AMP), cyclic guanosine-3,5-monophosphate (c-GMP), and phosphodiesterase (PDE). It seems unlikely that PGs bring about significant posterior pituitary oxytocin release in rats.
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PMID:Effect of prostaglandins on milk ejection. 23 77

Production, transport, storage and release of antidiuretic hormone (ADH) in the hypothalamo-neurohypophysial system were investigated. ADH produced by nerve cells in the paraventricular and supraoptic nuclei of the hypothalamus is present in a form bound to the specific protein neurophysin, in the neurosecretary granula. Electric and chemical stimulation of these nuclei results in evoked release of ADH in ionic association with neurophysin from the neural lobes. Acetylcholine, norepinephrine, histamine, angiotensin II, gamma-aminobutyric acid and L-glutamic acid have been regarded as candidates of chemical transmitters for the release of ADH in the hypothalamus. Prostaglandin (PG) E2 may be another important compound for central regulation of water metabolism. The possibility that PGE2 may be the transmitter or a modulator in the nuclei has to be considred. Serotonin, dopamine and taurine, however, may not be involded in the ADH releasing mechanisms in the hypothalamus. It appears that norepinephrine, histamine, angiotensin II, PGE2 and bradykinin stimulate directly the neural lobe to release ADH. The ADH release is regulated by intracellular Ca++. The existence of a "readily-releasable pool" of ADH can be ruled out and any limitation in the amount of ADH released under experimental conditions may be due to insufficient activation of the neural lobe. A physiological significance other than a carrier was proposed for neurophysin.
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PMID:[The hypothalamo-neurohypophysial system and antidiuretic hormone (author's transl)]. 33 45

Planimetry has been used to analyse the tocographic tracings recorded from 29 deliveries induced by means of prostaglandin F 2 alpha as well as those recorded from 28 deliveries induced by means of oxytocin. The contraction-causing effect of prostaglandin was found to be milder than that of oxytocin. Prostaglandin F 2 alpha, consequently, proved to be superior to oxytocin in handling placental insufficiency.
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PMID:[Planimetric analysis of labour induced by means of prostaglandin F 2 alpha and oxytocin (author's transl)]. 48 99

Prostaglandin (PG) gels were used to induce second-trimester abortion in 141 women aged 16-44 years, 1973-1976. PGE2 gel was used alone for 65 women, and in combination with oxytocin for 25 women; PGF2-alpha was used alone for 15, and combined with oxytocin for 36. Indications were: medical (5 cases), psychosocial (97 cases), and missed abortion or fetal death in utero (39 cases). The gel was administered extra-amniotically via catheter; abortion occurred within 36 hours in 136 cases. Mean administration abortion interval varied from 9 hours 52 minutes to 16 hours 17 minutes. A dose-response relationship was noted between the prostaglandin dose and the interval to abortion. Side effects included vomiting (29 cases), diarrhea (2 cases), fever (9 cases), hemorrhage (14 cases), endometritis (2 cases), and circulatory symptoms (2 cases) and torn cervix (1 case). No signficant differences between primigravidae and others were observed.
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PMID:[Therapeutic abortions in the second trimestre of pregnancy with prostaglandine gel (author's transl)]. 64 Mar 66

A review is made of the clinical use of prostaglandins in obstetrics and gynecology. Second trimester abortions can be induced by the transcervical extraamniotic, transabdominal intraamniotic, or intravenous injection of PGF2 alpha or PGE2. The use of these agents is currently the method of choice for this procedure. Studies have been made of methods of application which will lead to improved effectiveness and of the use of prostaglandins in combination with oxytocin. The use of prostaglandin analogues, which are metabolized more slowly than the natural prostaglandins, provides the advantages of decreased side effects and a decreased need of additional doses. The side effects associated with prostaglandin use include nausea, vomiting, diarrhea, heat waves, shivering, headache, dizziness, elevated temperatures, and leucocytosis. The mortality rate reported in a 4-year survey is 10.5/100,000 which compared favorably with the 17.7/100,000 for saline abortions. Prostaglandin gels can be used to soften and dilate the cervix in preparation for an abortion or induction of labor with no undesired side effects and without the use of laminarias. Labor can be induced by the administration of the prostaglandins F2 alpha and E2 either intravenously or, in the case of the latter, orally. Treatment with PGE2 can also continue parturition in cases of secondary insufficiency of labor. Research is currently being conducted in the use of these substances for fertility control.
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PMID:Application of prostaglandins in obstetrics and gynecology. 74 14

Prostaglandin A is known to be an antihypertensive vasodepressor agent produced by the kidney and has the basic potentialities of a hormone. No information is available at present concerning its effect on the human pregnant uterus and whether it can be used as an oxytocic compound to induce labour. The uterine stimulating and labour inducing ability of PGA1 was evaluated in 10 cases; seven patients were suffering from pregnancy toxemia while three were normal pregnancies near full term. Cardiotocographic tracings showed that uterine activity was markedly stimulated to a degree sufficient to induce labour. Continuous i.v. infusions at a rate of 0.25-1.0 mug/Kgm/min given over a fixed period of only 6 hours resulted in delivery in all cases except one following the discontinuation of administration. Beneficial effects on blood pressure were observed in toxemic subjects. Potentially serious FHR patterns and occasional hypertonus during therapy were seen and stress the need for more information to evaluate the safety, optimum dosage and duration of infusion as well as the place of this approach in clinical practice for the management of pregnancy toxemia. The absence of antidiuretic effect, the hypotensive response and uterine stimulating property of PGA1 indicate a possible advantage in toxemia of pregnancy as compared to oxytocin infusions.
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PMID:Renal prostaglandins for induction of labour-a dual clinical advantage in toxemia of pregnancy. 78 55

The total serum bilirubin levels at two and occasionally five days after birth were studied in 162 infants whose mothers received either intravenous oxytocin or oral Prostaglandin te2 during labour, and the results were compared with those obtained in forty-two control patients. Following labour of spontaneous onset, whether the mother received intravenous oxytocin or oral Prostaglandin E2, neonatal total serum bilirubin levels were not different from those in controls. After induction by amniotomy and an active agent, higher mean total serum bilirubin levels were found in infants whose mothers received intravenous oxytocin than in those given oral prostaglandin E2; a significant rise in the total serum bilirubin level appeared to occur when mothers received a total of more than 12,000 milliunits of oxytocin or more than 4,000 milliunits per kg birthweight of the infant.
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PMID:Neonatal jaundice--a comparison between intravenous oxytocin and oral prostaglandin E2. 102 49


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