Enpp1 is an anti-aging factor that regulates Klotho under phosphate overload conditions

Ryuichi Watanabe,Nobuyuki Fujita,Yuiko Sato,Tami Kobayashi,M. Morita,Takatsugu Oike,K. Miyamoto,M. Kuro-o,T. Michigami,S. Fukumoto,T. Tsuji,Y. Toyama,M. Nakamura,M. Matsumoto,T. Miyamoto

Published 2017 in Scientific Reports

ABSTRACT

Control of phosphate metabolism is crucial to regulate aging in mammals. Klotho is a well-known anti-aging factor that regulates phosphate metabolism: mice mutant or deficient in Klotho exhibit phenotypes resembling human aging. Here we show that ectonucleotide pyrophosphatase/phosphodiesterase 1 (Enpp1) is required for Klotho expression under phosphate overload conditions. Loss-of-function Enpp1ttw/ttw mice under phosphate overload conditions exhibited phenotypes resembling human aging and Klotho mutants, such as short life span, arteriosclerosis and osteoporosis, with elevated serum 1,25(OH)2D3 levels. Enpp1ttw/ttw mice also exhibited significantly reduced renal Klotho expression under phosphate overload conditions, and aging phenotypes in these mice were rescued by Klotho overexpression, a low vitamin D diet or vitamin D receptor knockout. These findings indicate that Enpp1 plays a crucial role in regulating aging via Klotho expression under phosphate overload conditions.

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