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2016 ; 291
(38
): 19725-19733
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Antidepressants Accumulate in Lipid Rafts Independent of Monoamine Transporters
to Modulate Redistribution of the G Protein, G?s
#MMPMID27432886
Erb SJ
; Schappi JM
; Rasenick MM
J Biol Chem
2016[Sep]; 291
(38
): 19725-19733
PMID27432886
show ga
Depression is a significant public health problem for which currently available
medications, if effective, require weeks to months of treatment before patients
respond. Previous studies have shown that the G protein responsible for
increasing cAMP (G?s) is increasingly localized to lipid rafts in depressed
subjects and that chronic antidepressant treatment translocates G?s from lipid
rafts. Translocation of G?s, which shows delayed onset after chronic
antidepressant treatment of rats or of C6 glioma cells, tracks with the delayed
onset of therapeutic action of antidepressants. Because antidepressants appear to
specifically modify G?s localized to lipid rafts, we sought to determine whether
structurally diverse antidepressants accumulate in lipid rafts. Sustained
treatment of C6 glioma cells, which lack 5-hydroxytryptamine transporters, showed
marked concentration of several antidepressants in raft fractions, as revealed by
increased absorbance and by mass fingerprint. Closely related molecules without
antidepressant activity did not concentrate in raft fractions. Thus, at least two
classes of antidepressants accumulate in lipid rafts and effect translocation of
G?s to the non-raft membrane fraction, where it activates the cAMP-signaling
cascade. Analysis of the structural determinants of raft localization may both
help to explain the hysteresis of antidepressant action and lead to design and
development of novel substrates for depression therapeutics.
|Animals
[MESH]
|Antidepressive Agents/*pharmacology
[MESH]
|Cell Line, Tumor
[MESH]
|Chromogranins/genetics/*metabolism
[MESH]
|Cyclic AMP/genetics/metabolism
[MESH]
|GTP-Binding Protein alpha Subunits, Gs/genetics/*metabolism
[MESH]