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Hypothalamic TTF-1 orchestrates the sensitivity of leptin.
Byong Seo Park1, Dasol Kang2, Kwang Kon Kim2
1Department of Biological Sciences, University of Ulsan, Ulsan, 44610, Republic of Korea; Division of Life Sciences, College of Life Sciences and Bioengineering, Incheon National University, Incheon, 22012, Republic of Korea.
Molecular Metabolism
|November 14, 2022
Summary
Thyroid transcription factor-1 (TTF-1) in the hypothalamus regulates leptin sensitivity. Deleting TTF-1 improves leptin signaling and protects against diet-induced obesity, suggesting TTF-1 as a therapeutic target.
Area of Science:
- Neuroscience
- Endocrinology
- Molecular Biology
Background:
- The hypothalamus regulates energy homeostasis.
- Leptin signaling is crucial for controlling appetite and body weight.
- Thyroid transcription factor-1 (TTF-1) is expressed in the hypothalamus.
Purpose of the Study:
- To investigate the role of TTF-1 in hypothalamic leptin signaling.
- To determine TTF-1's contribution to obesity development and leptin resistance.
Main Methods:
- Generated conditional knock-out mice lacking TTF-1 in leptin receptor (ObRb) or proopiomelanocortin (POMC) expressing cells.
- Assessed food intake, body weight, and energy expenditure using indirect calorimetry.
- Utilized immunohistochemistry, immunoblotting, qPCR, and promoter assays to elucidate molecular mechanisms.
Main Results:
- TTF-1 deletion in ObRb or POMC cells enhanced leptin's anorexigenic effects and STAT3 phosphorylation.
- TTF-1 was found to inhibit the transcriptional activity of the ObRb gene.
- Selective TTF-1 deletion in ObRb-positive cells conferred protection against diet-induced obesity by improving leptin resistance.
Conclusions:
- Hypothalamic TTF-1 plays a role in obesity development by modulating cellular leptin signaling.
- TTF-1 is a potential therapeutic target for obesity treatment and prevention.
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