Abstract

The endogenous formation of prostaglandin (PG) D 2, E 2, F 2α, and 6-keto-PGF 1α was determined in homogenates of mouse, rat, and rabbit brain, and of rat cerebral blood vessels, using gas chromatography mass spectrometry. In all species tested, 6-keto-PGF 1α could be identified in the brain homogenates, but was a minor component in relation to other PGs. In contrast 6-keto-PGF 1α was the most abundant PG in the blood vessels, being present in about 40-fold higher levels than in the brain tissue. PGD 2 was the most abundant PG in rat and mouse brains, but was below detection limits in the analyzed blood vessels. These studies indicating differential metabolism of PG endoperoxides in nervous and vascular tissue, provide a biochemical basis for further studies on the role of the PGs in brain circulation and neuronal activity.

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