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[{{cite journal | vauthors = Renthal W, Carle TL, Maze I, Covington HE, Truong HT, Alibhai I, Kumar A, Montgomery RL, Olson EN, Nestler EJ | title = Delta FosB mediates epigenetic desensitization of the c-fos gene after chronic amphetamine exposure | journal = J. Neurosci. | volume = 28 | issue = 29 | pages = 7344–9 | year = 2008 | pmid = 18632938 | pmc = 2610249 | doi = 10.1523/JNEUROSCI.1043-08.2008 | quote = This study reveals a novel epigenetic pathway through which ΔFosB mediates distinct transcriptional programs and ultimately behavioral plasticity to chronic amphetamine exposure. ... One attractive candidate is c-fos, a gene which is induced dramatically by acute psychostimulants but only weakly after repeated exposure (Hope et al., 1992; Persico et al., 1993; Steiner and Gerfen, 1993), when levels of ΔFosB and ΔFosB-containing AP-1 complexes are high (Hope et al., 1992, 1994). Since the c-fos gene contains an AP-1-like site in its proximal promoter (Morgan and Curran, 1989), it is a plausible candidate for ΔFosB-mediated repression. Induction of c-fos is traditionally viewed as an early marker of neural activation, since it is rapidly and transiently induced in response to a variety of stimuli (Morgan and Curran, 1989). The c-fos gene is also important for behavioral responses to cocaine, as mice lacking c-fos in dopamine D1 receptor-containing neurons, the neuronal cell type where ΔFosB is induced by psychostimulants (McClung et al., 2004), have reduced behavioral sensitization to cocaine (Zhang et al., 2006). These findings led us to investigate whether ΔFosB controls c-fos gene activity after chronic amphetamine exposure. We describe here a novel epigenetic mechanism by which ΔFosB accumulation in response to chronic amphetamine feeds back to desensitize c-fos induction to subsequent drug doses. This novel interplay between ΔFosB and chromatin remodeling events on the c-fos promoter may be an important homeostatic mechanism to regulate an animal’s sensitivity to repeated drug exposure.}}]
[{{cite journal | vauthors = Zlebnik NE, Hedges VL, Carroll ME, Meisel RL | title = Chronic wheel running affects cocaine-induced c-Fos expression in brain reward areas in rats | journal = Behav. Brain Res. | volume = 261 | issue = | pages = 71–8 | year = 2014 | pmid = 24342748 | doi = 10.1016/j.bbr.2013.12.012 | pmc = 4067570 | quote = Emerging evidence from human and animal studies suggests that exercise is a highly effective treatment for drug addiction. ... The mean fold change in cocaine-induced c-Fos cell counts relative to saline-induced c-Fos cell counts was significantly higher in exercising compared to control rats in the NAc core, dorsomedial and dorsolateral CPu, the prelimbic area, and the OFC, indicating differential cocaine-specific cellular activation of brain reward circuitry between exercising and control animals. These results suggest neurobiological mechanisms by which voluntary wheel running attenuates cocaine-motivated behaviors and provide support for exercise as a novel treatment for drug addiction.}}]
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