Purinergic signaling in human pluripotent stem cells is regulated by the housekeeping gene encoding hypoxanthine guanine phosphoribosyltransferase.

Proceedings of the National Academy of Sciences of the United States of America
Lina MastrangeloTheodore Friedmann

Abstract

Lesch-Nyhan disease (LND) is an X-linked genetic disorder caused by mutations of the hypoxanthine guanine phosphoribosyltransferase (HPRT) purine biosynthesis gene and characterized by aberrant purine metabolism, deficient basal ganglia dopamine levels, dystonia, and severe neurobehavioral manifestations, including compulsive self-injurious behavior. Although available evidence has identified important roles for purinergic signaling in brain development, the mechanisms linking HPRT deficiency, purinergic pathways, and neural dysfunction of LND are poorly understood. In these studies aimed at characterizing purinergic signaling in HPRT deficiency, we used a lentivirus vector stably expressing an shRNA targeted to the HPRT gene to produce HPRT-deficient human CVB induced pluripotent stem cells and human HUES11 embryonic stem cells. Both CVB and HUES11 cells show >99% HPRT knockdown and demonstrate markedly decreased expression of the purinergic P2Y1 receptor mRNA. In CVB cells, P2Y1 mRNA and protein down-regulation by HPRT knockdown is refractory to activation by the P2Y1 receptor agonist ATP and shows aberrant purinergic signaling, as reflected by marked deficiency of the transcription factor pCREB and constitutive activation of...Continue Reading

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