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  • ATPases
  • Many of these functional effects of ATP, furthermore, can be observed at extracellular concentrations (nanomolar to low-micromolar) that are generally well below the Michaelis constant (Km) values for most intracellular adenosine triphosphatases (ATPases) and other ATP-utilizing enzymes. (cdc.gov)
  • exogenous
  • While exogenous ATP can be rapidly catabolized to adenosine by a number of ectophosphohydrolases, many of the observed actions of extracellular ATP can be distinguished from those triggered by occupation of the well characterized A1- and A2-receptors for extracellular adenosine. (cdc.gov)
  • uridine
  • GPR17, which is mainly expressed in the central nervous system, has also been reported to be the receptor for the purines, Adenosine triphosphate and Uridine diphosphate, and certain glycosylated uridine diphosphate purines (http://www.guidetopharmacology.org/GRAC/ObjectDisplayForward?objectId=88) as well as to be involved in animal models of central nervous system Demyelinating reactions. (wikipedia.org)