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TPC: the NAADP discovery channel?

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Nicotinic acid adenine dinucleotide phosphate (NAADP) mobilizes Ca2+ but its target channel remains debated. Despite challenges, evidence suggests two-pore channels (TPCs) are crucial for NAADP-mediated cellular responses.

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Area of Science:

  • Cellular Biology
  • Molecular Pharmacology
  • Ion Channel Research

Background:

  • Nicotinic acid adenine dinucleotide phosphate (NAADP) is a potent Ca2+-mobilizing second messenger.
  • The precise identity of the NAADP-gated Ca2+-release channel has been a long-standing question in cell signaling.
  • Two-pore channels (TPCs) have been implicated as potential NAADP receptors.

Purpose of the Study:

  • To review the evidence for and against two-pore channels (TPCs) as the primary targets of NAADP.
  • To discuss recent findings that support the role of TPCs in NAADP-mediated calcium signaling.
  • To provide an overview of the ongoing debate surrounding the NAADP receptor.

Main Methods:

  • Literature review of recent studies on NAADP signaling and TPCs.
  • Analysis of experimental evidence implicating TPCs in NAADP responses.
  • Discussion of conflicting data and alternative hypotheses.

Main Results:

  • Accumulating evidence supports the involvement of TPCs in NAADP-mediated Ca2+ release.
  • Recent studies present challenges to the TPC hypothesis, but do not fully invalidate it.
  • TPCs remain strong candidates for the elusive NAADP receptor.

Conclusions:

  • Two-pore channels (TPCs) are critically important for NAADP-mediated cellular calcium dynamics.
  • Further research is needed to definitively confirm TPCs as the sole NAADP target.
  • The role of TPCs in NAADP signaling is a key area of ongoing investigation.