Appearance of 5‐hydroxytryptamine and an unidentified pharmacologically active lipid acid in effluent from perfused cerebral ventricles

Abstract

SUMMARY1. In cats anaesthetized with intraperitoneal pentobarbitone sodium, three regions of the cerebral ventricles, the third ventricle, the inferior or the anterior horn, were perfused with artificial c.s.f. and the effluent was tested on the fundus strip of the rat's stomach.2. Effluent from all three regions contracted the fundus strip. The contractions were due to at least two substances as revealed by treatment of the strip with 2-bromolysergic acid diethylamide (BOL). The contractions that were sensitive to BOL are attributed to 5-hydroxytryptamine (5-HT) whereas the BOL resistant contractions appear to be due to an unknown hydroxy acid related to irin or the prostaglandins.3. The contractions produced by effluent collected from the third ventricle were due wholly or mainly to 5-HT, those from the inferior horn to the unknown hydroxy acid, and those from the anterior horn to both substances in varying proportions. In addition, some samples of effluent from the third ventricle seemed to contain catecholamines as well.4. The 5-HT in the effluent from the third ventricle is thought to be derived from the hypothalamus. The amounts assayed in 1 ml. effluentthe volume collected during 10 or 20 min perfusion-varied between 0 4 and 12 ng 5-HT. Output of 5-HT was initially high, then usually decreased but sometimes increased again during prolonged perfusion when temperature began to rise as anaesthesia lightened or when additional pentobarbitone sodium was given intravenously.5. When perfusion of the third ventricle was continued after death the 5-HT content in the effluent increased 3 to 24-fold during the first hour and then gradually declined. This post mortem rise in 5-HT output * Supported by U.S

Fever produced by prostaglandin E1

“…A prostaglandin-like substance has been detected in the effluent from the perfused cerebral ventricles of anaesthetized and unanaesthetized cats (Feldberg & Myers, 1966;Feldberg, Myers & Veale, 1970), and in 1968, Holmes & Horton identified PGE1 in the hypothalamus of dogs. Since then it has been identified in perfusate from the perfused cerebral ventricles of dogs (S. W. Holmes, personal communication).…”

EFFECTS OF INTRACEREBROVENTRICULAR PROSTAGLANDINS E2 AND F2α ON THE URINE OUTFLOW, AND a POSSIBLE ROLE OF PGE2 AS a MODULATOR

“…(1, 2), from which PGs were released spontaneously (3,4) and in responses to electric and chemical stimulations (4,5). PGs, when administered centrally, produced various effects.…”

Correlation of prostaglandin release from the cerebral cortex of cats with the electrocorticogram, following stimulation of the reticular formation

“…Although PGF2a (03 jig/g) has been definitely identified in bovine brain by mass spectrometry (Samuelsson 1964), the identification and estimation of prostaglandins and prostaglandin-like substances within the central nervous system of dog, cat, and chick brain (Horton & Main 1967a;Holmes & Horton 1968a), as well as superfusates of cerebral cortex , cerebellum (Coceani & Wolfe 1965) and cerebroventricular system of the cat (Feldberg & Myers 1966), is tentative, and has depended upon the use of bioassay and thin-layer chromatography procedures similar to those described here. The symbols represent the specific areas of the AI chromatogram.…”