Abstract:
:Early-life stress in adolescence has a long-lasting influence on brain function in adulthood, and it is mostly recognized as a predisposing factor for mental illnesses, such as anxiety and posttraumatic stress disorder. Previous studies also indicated that adolescent predictable chronic mild stress (PCMS) in early life promotes resilience to depression- and anxiety-like behaviors in adulthood. However, the role of PCMS in associated memory process is still unclear. In the present study, we found that adolescent PCMS facilitated extinction and inhibited fear response in reinstatement and spontaneous recovery tests in adult rats, and this effect was still present 1 week later. PCMS in adolescence increased the activity of brain-derived neurotrophic factor (BDNF)-extracellular signal-regulated kinase 1/2 (ERK1/2) signaling in infralimbic cortex (IL) but not prelimbic cortex in adulthood. Intra-IL infusion of BDNF antibody and the ERK1/2 inhibitor U0126 reversed PCMS-induced enhancement of fear extinction. Moreover, we found that PCMS decreased DNA methylation of the Bdnf gene at exons IV and VI and elevated the mRNA levels of Bdnf in the IL. Our findings indicate that adolescent PCMS exposure promotes fear memory extinction in adulthood, which reevaluates the traditional notion of adolescent stress.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Deng JH,Yan W,Han Y,Chen C,Meng SQ,Sun CY,Xu LZ,Xue YX,Gao XJ,Chen N,Zhang FL,Wang YM,Shi J,Lu Ldoi
10.1038/s41598-017-08017-7subject
Has Abstractpub_date
2017-08-10 00:00:00pages
7857issue
1issn
2045-2322pii
10.1038/s41598-017-08017-7journal_volume
7pub_type
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