Endothelium-derived prostacyclin: effect of serum from women with normal and hypertensive pregnancy.
1. Pregnancy-induced hypertension (or pre-eclampsia) is characterized by vasoconstriction, platelet aggregation and altered capillary permeability, implying disordered endothelial function and/or structure. Serum from women with pregnancy-induced hypertension has been reported by others to be cytotoxic to endothelial cells in vitro. We hypothesized that such serum contains a factor that limits the ability of endothelial cells to produce and/or release prostacyclin. 2. Prostacyclin production by intact and damaged cultured human umbilical vein endothelial cells was measured after incubating these cells with serum from non-pregnant and normal pregnant women and women with pregnancy-induced hypertension. Confluent human umbilical vein endothelial cell monolayers (intact and damaged) were incubated with sera for 24 h at 37 degrees C followed by 1 h of incubation with added thrombin (stimulated production) or media (basal production). Supernatants were then collected for measurement of 6-keto-prostaglandin F1 alpha by radioimmunoassay. 3. Basal production of 6-keto-prostaglandin F1 alpha was greater in response to serum from non-pregnant women than to that from pregnant women. Within each group, sub-lethally damaged cells had a similar basal production of 6-keto-prostaglandin F1 alpha to that of intact cells. 4. Basal production of 6-keto-prostaglandin F1 alpha by intact or damaged cells incubated with sera from normal pregnant women and from women with pregnancy-induced hypertension was similar. 5. In all groups the addition of thrombin to intact endothelial cells increased 6-keto-prostaglandin F1 alpha production approximately 15-30-fold over basal levels, but only three- to five-fold in damaged endothelial cells.(ABSTRACT TRUNCATED AT 250 WORDS)
Zammit
V C
VC
Department of Renal Medicine, University of New South Wales, St George Hospital, Kogarah, Australia.
Whitworth
J A
JA
Brown
M A
MA
D015121:6-Ketoprostaglandin F1 alpha / Q000096:biosynthesis; D002478:Cells, Cultured; D004730:Endothelium, Vascular / Q000378:metabolism*; D011464:Epoprostenol / Q000096:biosynthesis*; D005260:Female; D006801:Humans; D011225:Pre-Eclampsia / Q000097:blood*; D011247:Pregnancy; D013917:Thrombin / Q000494:pharmacology
D015121:6-Ketoprostaglandin F1 alpha; D011464:Epoprostenol; D013917:Thrombin