Effect of prolonged exposure to milnacipran on norepinephrine transporter in cultured bovine adrenal medullary cells.

Abstract:

:The antidepressants milnacipran and paroxetine are used clinically worldwide. In the present study, we report here the effects of treatment with milnacipran and paroxetine on the functional activity, binding sites, and mRNA of the norepinephrine (NE) transporter (NET) in cultured bovine adrenal medullary cells. In acute treatment with antidepressants for 20 min, both milnacipran and paroxetine competitively inhibited NET function in cultured adrenal medullary cells. Prolonged treatment of adrenal medullary cells with milnacipran produced time (48-96h)- and concentration (35-355 nM)-dependent increases in [3H]NE uptake and [3H]DMI binding without any increase in NET mRNA. At a high concentration (800 nM, 72 h), paroxetine suppressed [3H]NE uptake. To examine whether milnacipran-induced [3H]NE uptake is mediated by newly synthesized mRNAs or proteins, we used actinomycin D, an inhibitor of DNA-dependent RNA polymerase, and cycloheximide, an inhibitor of ribosomal protein synthesis. Cycloheximide (1 micorM, 72 h) abolished the effect of milnacipran on [3H]NE uptake, while the stimulatory effect of milnacipran was observed in actinomycin D-treated cells. The present findings suggest that prolonged exposure to milnacipran up-regulates the NET function, probably through a post-transcriptional process of NET or other proteins.

journal_name

Biochem Pharmacol

journal_title

Biochemical pharmacology

authors

Shinkai K,Yoshimura R,Toyohira Y,Ueno S,Tsutsui M,Nakamura J,Yanagihara N

doi

10.1016/j.bcp.2005.07.031

subject

Has Abstract

pub_date

2005-11-01 00:00:00

pages

1389-97

issue

9

eissn

0006-2952

issn

1873-2968

pii

S0006-2952(05)00526-5

journal_volume

70

pub_type

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