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Related Experiment Videos

Ca2+ entry through plasma membrane IP3 receptors.

Olivier Dellis1, Skarlatos G Dedos, Stephen C Tovey

  • 1Department of Pharmacology, Tennis Court Road, Cambridge, CB2 1PD, UK.

Science (New York, N.Y.)
|July 15, 2006
PubMed
Summary
This summary is machine-generated.

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Inositol 1,4,5-trisphosphate receptors (IP3Rs) are found at the plasma membrane, mediating calcium ion (Ca2+) entry crucial for B cell receptor signaling. Few IP3Rs significantly impact Ca2+ influx, challenging previous understandings.

Area of Science:

  • Cellular Biology
  • Immunology
  • Molecular Physiology

Background:

  • Inositol 1,4,5-trisphosphate receptors (IP3Rs) primarily regulate calcium ion (Ca2+) release from intracellular stores.
  • The role of IP3Rs in mediating Ca2+ entry across the plasma membrane remains poorly understood.

Purpose of the Study:

  • To investigate the function of IP3Rs in Ca2+ entry, particularly in response to B cell receptor (BCR) activation.
  • To determine the localization and contribution of IP3Rs to plasma membrane Ca2+ permeability.

Main Methods:

  • Whole-cell and perforated-patch clamp electrophysiology in DT40 chicken and mouse B cells.
  • Genetic manipulation of IP3R expression and pore function.
  • Site-directed mutagenesis and functional expression studies.

Related Experiment Videos

Main Results:

  • IP3R activation opens a small number of Ca2+-permeable channels at the plasma membrane (PM).
  • BCR activation similarly evokes Ca2+ entry dependent on IP3R function.
  • IP3Rs are functionally expressed at the PM, contributing significantly to BCR-evoked Ca2+ signals.

Conclusions:

  • IP3Rs are uniquely localized to the plasma membrane in addition to the endoplasmic reticulum.
  • A small population of PM IP3Rs plays a critical role in BCR-mediated Ca2+ influx.
  • These findings redefine the role of IP3Rs in cellular calcium signaling and immune responses.