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Weight Perturbation Alters Leptin Signal Transduction in a Region-Specific Manner throughout the Brain.
Michael V Morabito1, Yann Ravussin1, Bridget R Mueller1
1Department of Pediatrics, Division of Molecular Genetics, Columbia University, College of Physicians and Surgeons, New York, New York, United States of America.
Plos One
|January 21, 2017
Summary
High-fat diets impair leptin signaling in the brain, contributing to obesity. Weight loss partially restores leptin sensitivity, but the pattern depends on the diet and weight loss method.
Area of Science:
- Neuroscience
- Metabolism
- Obesity Research
Background:
- Diet-induced obesity (DIO) from high-fat diets (HFD) blunts leptin's neuronal signaling, potentially defending acquired higher body weight.
- The molecular mechanisms behind this persistent defense in obesity remain unclear.
Purpose of the Study:
- To investigate how diet and weight loss impact leptin signaling across different brain regions.
- To identify brain areas crucial for energy homeostasis affected by HFD and subsequent weight loss.
Main Methods:
- Examined leptin responses in 23 brain regions of mice under four conditions: control, HFD, HFD with weight loss, and weight loss via standard chow.
- Assessed leptin signaling by quantifying phosphorylated signal transducer and activator of transcription 3 (pSTAT3) levels 30 minutes after leptin injection.
Main Results:
- HFD significantly attenuated leptin sensing across most brain regions.
- Weight loss did not fully restore leptin signaling in key energy homeostasis areas like the arcuate and dorsomedial hypothalamic nuclei.
- Leptin signaling restoration varied by brain region and was dependent on the weight loss method (calorie restriction vs. standard chow intake).
Conclusions:
- HFD-induced leptin resistance is widespread but not uniform across all brain regions.
- Weight loss can partially restore leptin sensitivity, with some regions showing hypersensitivity.
- The effectiveness of weight loss in restoring central leptin signaling is influenced by the specific diet and weight loss strategy employed.
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