Elevated hypothalamic TCPTP in obesity contributes to cellular leptin resistance.

Abstract

In obesity, anorectic responses to leptin are diminished, giving rise to the concept of "leptin resistance." Increased expression of protein tyrosine phosphatase 1B (PTP1B) has been associated with the attenuation of leptin signaling and development of cellular leptin resistance. Here we report that hypothalamic levels of the tyrosine phosphatase TCPTP are also elevated in obesity to attenuate the leptin response. We show that mice that lack TCPTP in neuronal cells have enhanced leptin sensitivity and are resistant to high-fat-diet-induced weight gain and the development of leptin resistance. Also, intracerebroventricular administration of a TCPTP inhibitor enhances leptin signaling and responses in mice. Moreover, the combined deletion of TCPTP and PTP1B in neuronal cells has additive effects in the prevention of diet-induced obesity. Our results identify TCPTP as a critical negative regulator of hypothalamic leptin signaling and causally link elevated TCPTP to the development of cellular leptin resistance in obesity.

• Authors: Kim Loh, Atsushi Fukushima, Xinmei Zhang, Sandra Galic, Dana Briggs, Pablo J Enriori, Stephanie Simonds, Florian Wiede, Alexander Reichenbach, Christine Hauser, Natalie A Sims, Kendra K Bence, Sheng Zhang, Zhong-Yin Zhang, Barbara B Kahn, Benjamin G Neel, Zane B Andrews, Michael A Cowley, Tony Tiganis
• Journal: Cell metabolism (Cell Metab) Vol. 14 Issue 5 Pg. 684-99 (Nov 02 2011) ISSN: 1932-7420 [Electronic] United States
• PMID: 22000926 (Publication Type: Journal Article, Research Support, N.I.H., Extramural, Research Support, Non-U.S. Gov't)
• Copyright: Copyright © 2011 Elsevier Inc. All rights reserved.

Chemical References

• Blood Glucose
• Enzyme Inhibitors
• Insulin
• Leptin
• Receptors, Leptin
• leptin receptor, mouse
• Protein Tyrosine Phosphatase, Non-Receptor Type 1
• Protein Tyrosine Phosphatase, Non-Receptor Type 2
• Ptpn1 protein, mouse

Topics

• Animals
• Blood Glucose (analysis)
• Body Composition (drug effects)
• Diet, High-Fat
• Enzyme Inhibitors (pharmacology)
• Female
• Gene Expression
• Hypothalamus (cytology, metabolism)
• Infusions, Intraventricular
• Insulin (blood)
• Leptin (metabolism)
• Male
• Mice
• Mice, Transgenic
• Neurons (cytology, metabolism)
• Obesity (genetics, metabolism)
• Protein Tyrosine Phosphatase, Non-Receptor Type 1 (antagonists & inhibitors, deficiency, genetics)
• Protein Tyrosine Phosphatase, Non-Receptor Type 2 (antagonists & inhibitors, deficiency, genetics)
• Receptors, Leptin (metabolism)
• Signal Transduction
• Tissue Culture Techniques