ENPP1 enzyme replacement therapy improves blood pressure and cardiovascular function in a mouse model of generalized arterial calcification of infancy

Disease Models & Mechanisms
Tayeba KhanKim L Askew

Abstract

Generalized arterial calcification of infancy (GACI) is a rare, life-threatening disorder caused by loss-of-function mutations in the gene encoding ectonucleotide pyrophosphatase phosphodiesterase 1 (ENPP1), which normally hydrolyzes extracellular ATP into AMP and pyrophosphate (PPi). The disease is characterized by extensive arterial calcification and stenosis of large- and medium-sized vessels, leading to vascular-related complications of hypertension and heart failure. There is currently no effective treatment available, but bisphosphonates - nonhydrolyzable PPi analogs - are being used off-label to reduce arterial calcification, although this has no reported impact on the hypertension and cardiac dysfunction features of GACI. In this study, the efficacy of a recombinant human ENPP1 protein therapeutic (rhENPP1) was tested in Enpp1asj-2J homozygous mice (Asj-2J or Asj-2J hom), a model previously described to show extensive mineralization in the arterial vasculature, similar to GACI patients. In a disease prevention study, Asj-2J mice treated with rhENPP1 for 3 weeks showed >95% reduction in aorta calcification. Terminal hemodynamics and echocardiography imaging of Asj-2J mice also revealed that a 6-week rhENPP1 treatment nor...Continue Reading

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Methods Mentioned

BETA
enzyme replacement therapy
flow cytometry

Software Mentioned

cellSens
QTest
GraphPad
GraphPad Prism

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