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Published on: May 19, 2017
Regulatory role of E-NTPase/E-NTPDase in Ca2+/Mg2+ transport via gated channel
Hans M Schreiber1, Subburaj Kannan
1Division of Gastroenterology, School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA. skannan22@hotmail.com
Background:
E-NTPase/E-NTPDase is activated by millimolar concentrations of Ca2+ or Mg2+ with a pH optimum of 7.5 for the hydrolysis of extracellular NTP and NDP. It has been generally accepted that E-NTPase/E-NTPDase plays regulatory role in purinergic signalling, but other functions may yet be discovered.
Results:
In this article it is proposed on the basis of published data that E-NTPase/E-NTPDase could play a role in the influx and efflux of Ca2+and Mg2+ in vivo.
Conclusions:
Attenuation of extracellular Ca2+ influx by rat cardiac sarcoplasmic anti-E-NTPase antibodies and oligomerization studies on mammalian CD39 conclusively point towards the existence of a new channel in the membrane. Further studies on these properties of the E-NTPase/E-NTPDase may provide detailed mechanisms and identify the potential patho-physiological significance.
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