Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: UNIPROT:P00790 (PGA)
 2,475 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

1 The report of the depression by indomethacin of vasoconstrictor responses to noradrenaline and their partial restoration by prostaglandin E(2) (PGE(2)) and PGE(1) in rat isolated perfused mesenteric blood vessels was investigated. The further suggestion that prostaglandins may be necessary for the combination of noradrenaline with the alpha-adrenoceptor in this tissue was also studied.2 The reported depression by indomethacin was confirmed and was further shown to be in the form of a concentration-dependent flattening of the noradrenaline concentration-effect curve.3 A concentration-dependent restorative effect was observed for all prostaglandins studied. The decreasing order of potency for the restoration towards normal of the indomethacin-depressed responses to noradrenaline was: PGE(2), PGE(1), PGA(1), PGF(2alpha), PGA(2).4 The prostaglandins studied were not uniform in their restorative actions and could be separated into two groups. PGE(2) and PGE(1) restored responses towards the control level whereas PGA(1), PGA(2) and PGF(2alpha) increased responses to an above control level and did so over a smaller concentration range. The possibility of several prostaglandin receptors is discussed.5 At concentrations equi-effective in restoring depressed responses to control levels PGA(1) but not PGE(2), caused a parallel shift of the noradrenaline concentration-effect curve to the left and a small, gradual rise in the basal perfusion pressure.6 The reason for the differing effects remains obscure but does not seem to involve a change in the alpha-adrenoceptor as indicated by the pA(2) of phentolamine. Furthermore, the restorative and potentiating effect of PGA(1) is not mediated by blockade of neuronal uptake of noradrenaline.7 It appears that prostaglandins are required for the vasoconstrictor action of noradrenaline in rat mesenteric blood vessels and that this effect is distal to the drug-receptor interaction. The possible involvement of prostaglandins with intracellular calcium ions is discussed.
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PMID:The influence of prostaglandins on noradrenaline-induced vasoconstriction isolated perfused mesenteric blood vessels of the rat. 20 65

The contractile response of the isolated testicular capsule to acetylcholine, norepinephrine and prostaglandins (A-2, E-1 and F-2alpha) was related to the age of the rat. Norepinephrine and PGA-2 caused an increased capsular response between 45 and 60 days of age, the time at which spermiogenesis begins. It is suggested that the activity of the testicular capsule is involved in the transport of non-motile spermatozoa from the testis and into the epididymis.
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PMID:Age-related differences in the response of the isolated testicular capsule of the rat to norepinephrine, acetylcholine and prostaglandins. 72 75

1. The relationship between the vasodilator and inhibitory effects of prostaglandin E(1) (PGE(1)), E(2) and A(2) on responses to nerve stimulation, noradrenaline and angiotensin was evaluated in the dog hindlimb preparation.2. PGE(1) and PGE(2) were equipotent as vasodilators in the hindlimb; however, PGE(1) was much more potent as an inhibitor of vasoconstrictor responses to nerve stimulation, noradrenaline and angiotensin.3. PGA(2) and PGE(2) were approximately equal as inhibitors of vasoconstrictor responses to noradrenaline, nerve stimulation and angiotensin; however, PGE(2) was far more potent as a vasodilator.4. Since there is no relationship between the vasodilator and inhibitory effects of PGE(1), E(2) and A(2), and since the inhibitory effect of PGA(2) was present at a time when hindlimb perfusion pressure had returned to control value, it is concluded that the inhibitory action is probably not the result of a physiological antagonism.5. Since each prostaglandin inhibited responses to nerve stimulation and noradrenaline to approximately the same extent and responses to angiotensin were also inhibited, it is suggested that these agents antagonize vasoconstrictor responses by a nonspecific depressant effect on smooth muscle cells.
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PMID:Effect of prostaglandins E 1 , E 2 and A 2 on vascular resistance and responses to noradrenaline, nerve stimulation and angiotensin in the dog hindlimb. 434 79