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Zha, Weibin; Ho, Horace T B; Hu, Tao; Hebert, Mary F; Wang, Joanne
Scientific reports, 04/2017, Volume: 7, Issue: 1Journal Article
Depression and use of antidepressant medications are both associated with increased risk of obesity, potentially attributed to a reduced serotonin transporter (SERT) function. However, how SERT deficiency promotes obesity is unknown. Here, we demonstrated that SERT mice display abnormal fat accumulation in both white and brown adipose tissues, glucose intolerance and insulin resistance while exhibiting suppressed aromatase (Cyp19a1) expression and reduced circulating 17β-estradiol levels. 17β-estradiol replacement in SERT mice reversed the obesity and glucose intolerance, supporting a role for estrogen in SERT deficiency-associated obesity and glucose intolerance. Treatment of wild type mice with paroxetine, a chemical inhibitor of SERT, also resulted in Cyp19a1 suppression, decreased circulating 17β-estradiol levels, abnormal fat accumulation, and glucose intolerance. Such effects were not observed in paroxetine-treated SERT mice. Conversely, pregnant SERT mice displayed normalized estrogen levels, markedly reduced fat accumulation, and improved glucose tolerance, which can be eliminated by an antagonist of estrogen receptor α (ERα). Together, these findings support that estrogen suppression is involved in SERT deficiency-induced obesity and glucose intolerance, and suggest approaches to restore 17β-estradiol levels as a novel treatment option for SERT deficiency associated obesity and metabolic abnormalities.
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