Gene-environment interactions mediate stress susceptibility and resilience through the CaMKIIβ/TARPγ-8/AMPAR pathway

• Main Authors: Yusuke Sakai, Haiyan Li, Hiromichi Inaba, Yuki Funayama, Erina Ishimori, Ayako Kawatake-Kuno, Hirotaka Yamagata, Tomoe Seki, Teruyuki Hobara, Shin Nakagawa, Yoshifumi Watanabe, Susumu Tomita, Toshiya Murai, Shusaku Uchida
• Format: Article
• Language: English
• Published: Elsevier 2021-05-01
• Series: iScience
• Subjects: Behavioral neuroscience; Molecular neuroscience; Cellular neuroscience
• Online Access: http://www.sciencedirect.com/science/article/pii/S2589004221004727

Summary: Although stressful events predispose individuals to psychiatric disorders, such as depression, not all people who undergo a stressful life experience become depressed, suggesting that gene-environment interactions (GxE) determine depression risk. The ventral hippocampus (vHPC) plays key roles in motivation, sociability, anhedonia, despair-like behaviors, anxiety, sleep, and feeding, pointing to the involvement of this brain region in depression. However, the molecular mechanisms underlying the cross talk between the vHPC and GxE in shaping behavioral susceptibility and resilience to chronic stress remain elusive. Here, we show that Ca2+/calmodulin-dependent protein kinase IIβ (CaMKIIβ) activity in the vHPC is differentially modulated in GxE mouse models of depression susceptibility and resilience, and that CaMKIIβ-mediated TARPγ-8 phosphorylation enhances the expression of AMPA receptor subunit GluA1 in the postsynaptic sites to enable stress resilience. We present previously missing molecular mechanisms underlying chronic stress-elicited behavioral changes, providing strategies for preventing and treating stress-related psychiatric disorders.