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Channel Behavior and Voltage Gating of a Cx43 Mutant Simulating Preconditioning.

Jose F Ek-Vitorin1, Diego Silva-Mendoza1, Tasha K Pontifex1

  • 1Department of Physiology, University of Arizona, Tucson, Arizona, USA.

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PubMed
Summary

Ischemic preconditioning affects Connexin 43 (Cx43) phosphorylation. A Cx43 mutant mimicking this phosphorylation showed altered hemichannel and gap junction properties, potentially preserving cell communication during ischemia.

Keywords:
CK1Cx43PKCischemiapatch clamppreconditioning

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Area of Science:

  • Cardiovascular Biology
  • Molecular Cell Biology
  • Biophysics

Background:

  • Ischemic preconditioning alters Connexin 43 (Cx43) phosphorylation and localization.
  • Casein kinase 1 (CK1) and protein kinase C (PKC) phosphorylation of Cx43 are cardioprotective.
  • The functional consequences of Cx43 phosphorylation mimicking preconditioning remain unclear.

Purpose of the Study:

  • To investigate the channel characteristics of a Cx43 mutant mimicking CK1 and PKC phosphorylation associated with ischemic preconditioning.
  • To analyze the electrical behavior of Cx43 at both single-channel and macroscopic levels.

Main Methods:

  • Whole-cell patch-clamp recordings were utilized.
  • Cells expressing a mutant Cx43 (Cx43pc) mimicking preconditioning phosphorylation were studied.
  • Single-channel and macroscopic electrical behaviors were analyzed.

Main Results:

  • Cx43pc hemichannels exhibited readily opening.
  • Gap junction channels showed intermediate amplitudes compared to wild-type and CK1-phosphorylated Cx43.
  • Voltage gating of Cx43pc gap junction channels was weaker than wild-type or CK1-phosphorylated forms.

Conclusions:

  • Cx43 phosphorylation by PKC during ischemic preconditioning may lead to junctional channels insensitive to voltage.
  • This insensitivity could preserve intercellular communication under ischemic conditions.
  • Understanding Cx43 channel behavior is crucial for developing cardioprotective strategies.