Biomedical subjects
Publications and source records attributed to D A Reinke.
Synthesis of prostaglandin E2 by renal medulla from SHR and WKY rats was compared during early postnatal development. Although arterial blood pressure was significantly higher in SHR as early as 6 weeks of age, no difference in renal medullary prostaglandin synthesis was observed.
Increased activity of prostaglandin synthetase in spontaneously hypertensive rats (SHR) during development has previously been reported. The investigations reported herein utilized an immunofluorescent technique to qualitatively assess the activity of the first enzyme in the PGE2 biosynthetic pathway, the prostaglandin-forming cyclooxygenase (PG-C), in SHR kidneys during development. PG-C antigenicity increased from 4 to 15 weeks in both SHRs and Wistar Kyoto normotensive rats. However, in agreement with our previous in vitro data no difference in PG-C was observed between strains at any age.
The realtionship between in vitro prostaglandin production by renal medullary tissue and hypertension was investigated in three models of hypertensive rat, i.e., DOCA, Goldblatt and SHR. Medullary minces were incubated for 30 minutes. Following incubation tissue PGE2 concentration was quantified using mass fragmentography. Media PGE2 concentrations were quantified using radioimmunoassay. Concentrations of PGE2 in tissue from Goldblatts and SHRs were significantly less than normotensive controls. The concentration of PGE2 in media after incubating SHR tissue was significantly less than normotensives. The data suggest that alterations in PGE2 metabolism are similar in Goldblatt and SHR hypertension.
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