Serotonin Prevents Differentiation of Brown Adipocytes by Interfering with Their Clock

Sigal Rozenblit-Susan, Nava Chapnik, Oren Froy*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


Objective: Serotonin was shown to interfere with the differentiation of brown adipocytes. In addition, clock components inhibit brown adipogenesis through direct transcriptional control of key components of the transforming growth factor β pathway. The aim of this study was to investigate whether serotonin abrogates brown adipogenesis by affecting clock functionality. Methods: Nondifferentiated and differentiated HIB1B brown adipocytes were treated with serotonin, and their clock expression and functionality and differentiation state were examined. Results: Nondifferentiated HIB1B brown adipocytes treated with serotonin showed increased brown adipocyte markers alongside increased brain-muscle Arnt-like protein 1 (Bmal1) and RAR related orphan receptor A (Rora) but decreased nuclear receptor Rev-erbα mRNA levels. BMAL1 overexpression together with serotonin led to significantly lower brown adipocyte markers. Serotonin in the differentiation cocktail led to reduced brown adipocyte markers as well as clock gene expression. After differentiation, serotonin treatment significantly decreased brown adipocyte markers and reduced BMAL1 and RORα but increased REV-ERBα protein levels. Addition of serotonin to the differentiation medium or addition after differentiation reduced activity of calcium/calmodulin-dependent protein kinase type II subunit gamma, which interferes with circadian locomoter output cycles protein kaput (CLOCK):BMAL1 dimerization and transactivation. Conclusions: Clock expression is required at the early stages of differentiation to brown adipocytes, and serotonin interferes with this process by modulating clock functionality. Serotonin interferes with clock functionality by reducing the levels of the active form of calcium/calmodulin-dependent protein kinase type II subunit gamma.

Original languageAmerican English
Pages (from-to)2018-2024
Number of pages7
Issue number12
StatePublished - 1 Dec 2019

Bibliographical note

Publisher Copyright:
© 2019 The Obesity Society


Dive into the research topics of 'Serotonin Prevents Differentiation of Brown Adipocytes by Interfering with Their Clock'. Together they form a unique fingerprint.

Cite this