Possible involvement of brain prostaglandin E2 and prostanoid EP3 receptors in prostaglandin E2 glycerol ester-induced activation of central sympathetic outflow in the rat.

Abstract:

:We recently reported that intracerebroventricularly administered 2-arachidonoylglycerol elevated plasma noradrenaline and adrenaline by brain monoacylglycerol lipase- (MGL) and cyclooxygenase-mediated mechanisms in the rat. These results suggest that 2-arachidonoylglycerol is hydrolyzed by MGL to free arachidonic acid, which is further metabolized to prostaglandins (PGs) by cyclooxygenase in the brain, thereby elevating plasma noradrenaline and adrenaline. On the other hand, 2-arachidonoylglycerol can be also metabolized by cyclooxygenase to PG glycerol esters (PG-Gs), which seems to be hydrolyzed by MGL to free PGs. Here, we examined the involvement of brain PG-Gs in the elevation of plasma noradrenaline and adrenaline regarding PGE2-G and prostanoid EP receptors using anesthetized male Wistar rats. Intracerebroventricularly administered PGE2-G (1.5 and 3 nmol/animal) dose-dependently elevated plasma noradrenaline but not adrenaline. PGE2-G also elevated systolic, mean and diastolic blood pressure and heart rate. The PGE2-G-induced elevation of plasma noradrenaline was attenuated by JZL184 (MGL inhibitor). Intracerebroventricularly administered PGE2 (0.3 and 1.5 nmol/animal) and sulprostone (0.1 and 0.3 nmol/animal) (EP1/EP3 agonist) also elevated plasma noradrenaline but not adrenaline in a dose-dependent manner. The sulprostone-induced elevation was attenuated by L-798,106 (EP3 antagonist), but not by SC-51322 (EP1 antagonist). L-798,106 also attenuated the PGE2-G- and PGE2-induced elevation of plasma noradrenaline, while PF-04418948 (EP2 antagonist) and L-161,982 (EP4 antagonist) had no effect on the PGE2-G-induced response. These results suggest a possibility that brain PGE2-G produced from 2-arachidonoylglycerol can be hydrolyzed to free PGE2, thereby activating central sympathetic outflow by brain prostanoid EP3 receptor-mediated mechanisms in the rat.

journal_name

Neuropharmacology

journal_title

Neuropharmacology

authors

Shimizu T,Tanaka K,Nakamura K,Taniuchi K,Yawata T,Higashi Y,Ueba T,Dimitriadis F,Shimizu S,Yokotani K,Saito M

doi

10.1016/j.neuropharm.2014.03.005

subject

Has Abstract

pub_date

2014-07-01 00:00:00

pages

19-27

eissn

0028-3908

issn

1873-7064

pii

S0028-3908(14)00090-2

journal_volume

82

pub_type

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