The effects of acute and chronic lithium treatment on pilocarpine-stimulated phosphoinositide hydrolysis in mouse brain in vivo.

Abstract:

:1. Measurements were made of the in vivo formation of inositol phosphates in the brains of C57/B1/601a mice treated acutely or chronically with lithium chloride (LiCl). 2. A single injection of LiCl (10 mEquiv kg-1, s.c.) 18 h before death increased the accumulation of [3H]-inositol phosphates ([3H]-Ins P's) in the brains of mice injected i.c.v. with [3H]-myo-inositol 24 h previously. 3. Pilocarpine (200 mg kg-1, i.p.) injected 15 min before death further enhanced the formation of [3H]-Ins P's in the brains of LiCl-treated, but not saline-treated, mice. The enhancement due to pilocarpine was abolished by injection of atropine sulphate (10 mg kg-1, i.p.) 10 min earlier. 4. Chronic (14 days) LiCl feeding produced an accumulation of [3H]-Ins P's significantly less than that due to a single injection of LiCl, but the response to pilocarpine was markedly greater in mice chronically fed with LiCl when compared with mice acutely injected with LiCl. 5. Mass measurements of endogenous inositol 1,4,5 triphosphate revealed increases due to pilocarpine and chronic LiCl feeding alone. A combination of the two treatments produced levels greater than either alone. 6. These results demonstrate that LiCl treatment enhances both basal and pilocarpine-stimulated inositol phospholipid hydrolysis in vivo and this might be relevant to its therapeutic effects.

journal_name

Br J Pharmacol

authors

Whitworth P,Heal DJ,Kendall DA

doi

10.1111/j.1476-5381.1990.tb12085.x

subject

Has Abstract

pub_date

1990-09-01 00:00:00

pages

39-44

issue

1

eissn

0007-1188

issn

1476-5381

journal_volume

101

pub_type

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