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2016 ; 43
(5
): 681-8
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Orexin gene transfer into the amygdala suppresses both spontaneous and
emotion-induced cataplexy in orexin-knockout mice
#MMPMID26741960
Liu M
; Blanco-Centurion C
; Konadhode RR
; Luan L
; Shiromani PJ
Eur J Neurosci
2016[Mar]; 43
(5
): 681-8
PMID26741960
show ga
Narcolepsy is a chronic sleep disorder linked to the loss of orexin-producing
neurons in the hypothalamus. Cataplexy, a sudden loss of muscle tone during
waking, is an important distinguishing symptom of narcolepsy and it is often
triggered by strong emotions. The neural circuit underlying cataplexy attacks is
not known, but is likely to involve the amygdala, a region implicated in
regulating emotions. In mice models of narcolepsy, transfer of the orexin gene
into surrogate neurons has been successful in ameliorating narcoleptic symptoms.
However, it is not known whether this method also blocks cataplexy triggered by
strong emotions. To examine this possibility, the gene encoding mouse
prepro-orexin was transferred into amygdala neurons of orexin-knockout (KO) mice
(rAAV-orexin; n = 8). Orexin-KO mice that did not receive gene transfer (no-rAAV;
n = 7) or received only the reporter gene (rAAV-GFP; n = 7) served as controls.
Three weeks later, the animal's sleep and behaviour were recorded at night
(no-odour control night), followed by another recording at night in the presence
of predator odour (odour night). Orexin-KO mice given the orexin gene transfer
into surrogate amygdala neurons had significantly less spontaneous bouts of
cataplexy, and predator odour did not induce cataplexy compared with control
mice. Moreover, the mice with orexin gene transfer were awake more during the
odour night. These results demonstrate that orexin gene transfer into amygdala
neurons can suppress both spontaneous and emotion-induced cataplexy attacks in
narcoleptic mice. It suggests that manipulating amygdala pathways is a potential
strategy for treating cataplexy in narcolepsy.