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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Nat+Commun
2015 ; 6
(ä): 6770
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English Wikipedia
Increased CRF signalling in a ventral tegmental area-interpeduncular
nucleus-medial habenula circuit induces anxiety during nicotine withdrawal
#MMPMID25898242
Zhao-Shea R
; DeGroot SR
; Liu L
; Vallaster M
; Pang X
; Su Q
; Gao G
; Rando OJ
; Martin GE
; George O
; Gardner PD
; Tapper AR
Nat Commun
2015[Apr]; 6
(ä): 6770
PMID25898242
show ga
Increased anxiety is a prominent withdrawal symptom in abstinent smokers, yet the
neuroanatomical and molecular bases underlying it are unclear. Here we show that
withdrawal-induced anxiety increases activity of neurons in the interpeduncular
intermediate (IPI), a subregion of the interpeduncular nucleus (IPN). IPI
activation during nicotine withdrawal was mediated by increased corticotropin
releasing factor (CRF) receptor-1 expression and signalling, which modulated
glutamatergic input from the medial habenula (MHb). Pharmacological blockade of
IPN CRF1 receptors or optogenetic silencing of MHb input reduced IPI activation
and alleviated withdrawal-induced anxiety; whereas IPN CRF infusion in mice
increased anxiety. We identified a mesointerpeduncular circuit, consisting of
ventral tegmental area (VTA) dopaminergic neurons projecting to the IPN, as a
potential source of CRF. Knockdown of CRF synthesis in the VTA prevented IPI
activation and anxiety during nicotine withdrawal. These data indicate that
increased CRF receptor signalling within a VTA-IPN-MHb circuit triggers anxiety
during nicotine withdrawal.