Schreiber HM, Kannan S. Regulatory role of E-NTPase/E-NTPDase in Ca2+/Mg2+ transport via gated channel.
Theor Biol Med Model 2004;
1:3. [PMID:
15307889 PMCID:
PMC516237 DOI:
10.1186/1742-4682-1-3]
[Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2004] [Accepted: 08/12/2004] [Indexed: 11/23/2022] Open
Abstract
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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