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Extracellular signal-regulated kinase 5 (Erk5), a member of the MAPK family, is specifically phosphorylated and activated by MAPK/Erk kinase-5. Although it has been implicated in odor discrimination and long-term memory via its expression in the central nervous system, little is known regarding the physiological importance of neuronal Erk5 in body weight and energy homeostasis. In the current study, systemic insulin injection significantly induced phosphorylation of Erk5 in the hypothalamus. Moreover, Erk5 deficiency in leptin receptor (LepR)‒expressing neurons led to an obesity phenotype, with increased white adipose tissue mass due to increased adipocyte size, only in female mice fed a normal chow diet. Furthermore, Erk5 deficiency in LepR-expressing neurons showed impaired glucose tolerance along with decreased physical activity, food intake, and energy expenditure. These results suggest that Erk5 controls body weight and systemic energy homeostasis probably via its expression in hypothalamic neurons in female mice, thereby providing a target for metabolic diseases such as obesity and type 2 diabetes mellitus.
Pubmed ID: 31555819
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