Let-7i-5p represses brite adipocyte function in mice and humans

Area of Science:

• Cell Biology
• Metabolism
• Molecular Biology

Background:

• Brown adipose tissue (BAT) facilitates non-shivering thermogenesis for energy expenditure.
• The discovery of thermogenic brite/beige adipocytes offers new strategies for combating obesity.
• Identifying regulators of the brite adipogenic program is crucial for therapeutic development.

Purpose of the Study:

• To identify microRNAs (miRNAs) involved in the white to brite adipocyte conversion.
• To investigate the role of differentially expressed miRNAs in human adipocytes.

Main Methods:

• Global miRNA expression profiling of human adipocytes.
• Analysis of Let-7i-5p and UCP1 expression in vitro and in vivo.
• Functional studies using Let-7i-5p mimics in human and murine models.

Main Results:

• Let-7i-5p was found to be downregulated in brite adipocytes.
• Inverse correlation observed between Let-7i-5p and UCP1 expression.
• Let-7i-5p mimic reduced UCP1 expression and oxygen consumption in human brite adipocytes.
• Inhibition of the browning process upon beta-3 adrenergic stimulation in mice.

Conclusions:

• Let-7i-5p plays a role in regulating brite adipocyte function and recruitment.
• Targeting Let-7i-5p may offer a novel therapeutic approach for obesity and related metabolic disorders.