cells Article A Leptin Receptor Antagonist Attenuates Adipose Tissue Browning and Muscle Wasting in Infantile Nephropathic Cystinosis-Associated Cachexia Alex Gonzalez 1,†, Wai W. Cheung 1,†, Elliot A. Perens 1, Eduardo A. Oliveira 1,2, Arieh Gertler 3 and Robert H. Mak 1,* 1 Division of Pediatric Nephrology, Rady Children’s Hospital, University of California, San Diego, CA 92093-0831, USA;
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[email protected] (E.A.O.) 2 Health Sciences Postgraduate Program, School of Medicine, Federal University of Minas Gerais (UFMG), Belo Horizonte 30130-100, MG, Brazil 3 Institute of Biochemistry, Food Science and Nutrition, Hebrew University of Jerusalem, Rehovot 7610001, Israel;
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[email protected]; Tel.: +1-858-822-6717; Fax: +1-858-822-6776 † These authors contributed equally to this work. Abstract: Mice lacking the functional cystinosin gene (Ctns−/−), a model of infantile nephropathic cystinosis (INC), exhibit the cachexia phenotype with adipose tissue browning and muscle wasting. Elevated leptin signaling is an important cause of chronic kidney disease-associated cachexia. The pegylated leptin receptor antagonist (PLA) binds to but does not activate the leptin receptor. We tested the efficacy of this PLA in Ctns−/− mice. We treated 12-month-old Ctns−/− mice and control Citation: Gonzalez, A.; Cheung, mice with PLA (7 mg/kg/day, IP) or saline as a vehicle for 28 days. PLA normalized food intake and W.W.; Perens, E.A.; Oliveira, E.A.; weight gain, increased fat and lean mass, decreased metabolic rate and improved muscle function.