Alterations of tubulin function caused by chronic antidepressant treatment in rat brain.

Abstract:

:1. Antidepressants have been used clinically for many years; however, the neurochemical mechanism for their therapeutic effect has not been clarified yet. Recent reports indicate that chronic antidepressant treatment directly affects the postsynaptic membrane to increase the coupling between the stimulatory GTP-binding (G) protein, Gs, and adenylyl cyclase. Tubulin, a cytoskeletal element, is involved in the stimulatory and inhibitory regulation of adenylyl cyclase in rat cerebral cortex via direct transfer of GTP to G proteins. In this study, we investigated whether the functional change of the adenylyl cyclase system caused by chronic antidepressant treatment involves an alteration of tubulin function in the regulation of adenylyl cyclase activity. 2. Male Sprague-Dawley rats were treated once daily with amitriptyline or saline by intraperitoneal injection (10 mg/kg) for 21 days, and their cerebral cortex membranes and GppNHp-liganded tubulin (tubulin-GppNHp) were prepared for what. 3. GppNHp-stimulated adenylyl cyclase activity in cortex membranes from amitriptyline-treated rats was significantly higher than that in control membranes. Furthermore, tubulin-GppNHp prepared from amitriptyline-treated rats was more potent than that from control rats in the stimulation of adenylyl cyclase activity in the cortex membranes of the controls. However, there was no significant difference in manganese-stimulated adenylyl cyclase activity between control and amitriptyline-treated rats. 4. The present results suggest that chronic antidepressant treatment enhances not only the coupling between Gs and the catalytic subunit of adenylyl cyclase but also tubulin interaction with Gs in the cerebral cortex of the rat.

journal_name

Cell Mol Neurobiol

authors

Kamada H,Saito T,Hatta S,Toki S,Ozawa H,Watanabe M,Takahata N

doi

10.1023/a:1006972709733

subject

Has Abstract

pub_date

1999-02-01 00:00:00

pages

109-17

issue

1

eissn

0272-4340

issn

1573-6830

journal_volume

19

pub_type

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