Prostaglandin generation in rabbit kidney Hormone-activated selective lipolysis coupled to prostaglandin biosynthesis

Michal Schwartzman, Amiram Raz

Research output: Contribution to journalArticlepeer-review

Abstract

The endogenous release of prostaglandins and free fatty acids from the isolated perfused rabbit kidney in the absence or presence of stimulation by bradykinin or angiotensin-II was investigated. Basal (nonstimulated) release of prostaglandin-precursor arachidonic acid was 15-20-fold higher than that of prostaglandin E2 indicating a low conversion of released arachidonate to prostaglandins. Addition of bovine serum albumin to the perfusion medium caused a substantial (50-250%) increase in the release of all fatty acids except myristic and arachidonic acids, and no significant change in prostaglandin E2 generation. In contrast, administration of bradykinin (0.5μg) or angiotensin-II (1 μg) caused a 10-15-fold increase in prostaglandin E2 release, and with albumin present, also a 2-3-fold selective increase in arachidonic acid release. Thus, unlike what was observed under basal conditions, arachidonic acid released following hormone stimulation is efficiently converted to prostaglandin E2. We conclude that administration of bradykinin or angiotensin-II into the perfused kidney activates a lipase which selectively releases arachidonic acid, probably from a unique lipid entity. This lipase reaction is tightly coupled to a prostaglandin generating system so that the released arachidonate is first made available to the prostaglandin cyclooxygenase, resulting in its substantial conversion to prostaglandins.

Original languageEnglish
Pages (from-to)363-369
Number of pages7
JournalBiochimica et Biophysica Acta - Molecular and Cell Biology of Lipids
Volume572
Issue number2
DOIs
StatePublished - 26 Feb 1979

Keywords

  • (Perfused kidney)
  • Angiotensin II
  • Arachidonic acid
  • Bradykinin
  • Lipolysis
  • Prostaglandin biosynthesis

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