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Potassium and calcium channels in lymphocytes

R S Lewis1, M D Cahalan

  • 1Department of Molecular and Cellular Physiology, Stanford University School of Medicine, California 94305, USA.

Annual Review of Immunology
|January 1, 1995
PubMed
Summary

This review explores how potassium and calcium channels in lymphocytes influence cell activation and signaling. By using patch-clamp techniques and fluorescence measurements, researchers have identified key channels like Kv1.3 and Kv3.1 that are upregulated during activation. Blocking these channels disrupts calcium influx and inhibits activation. The study also reveals that calcium oscillations are closely linked to channel activity and are essential for lymphocyte function. Single-cell techniques help track these dynamics, showing how ion channels regulate membrane potential and calcium levels, which in turn affect gene expression. These findings highlight the importance of ion channels in lymphocyte behavior and suggest that further research is needed to fully understand their roles.

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Area of Science:

  • Immunology and lymphocyte signaling
  • Membrane physiology and ion channel research
  • Calcium signaling in cellular biology

Background:

Lymphocyte function relies on precise regulation of ion channels, particularly potassium and calcium channels. These channels influence membrane potential and intracellular calcium levels, which are critical for cell activation and signaling. While prior research has identified several ion channels in lymphocytes, the specific roles of potassium and calcium channels remain partially unresolved. Earlier studies established that lymphocytes express voltage-dependent and calcium-activated potassium channels, but the mechanisms linking these channels to lymphocyte activation are not fully understood. The patch-clamp technique has enabled detailed characterization of these channels, yet the functional significance of specific subtypes remains unclear. Researchers have observed that both K(V) and K(Ca) channels are upregulated during lymphocyte activation, but the exact pathways remain to be fully elucidated. This gap motivated the current review to synthesize findings on potassium and calcium channels in lymphocytes. By examining biophysical and regulatory aspects, this review aims to clarify how these channels contribute to lymphocyte function.

Keywords:
lymphocyte ion channelscalcium signaling in immune cellsKv1.3 functionpatch-clamp lymphocyte studies

Frequently Asked Questions

The study shows that blocking K(V) and K(Ca) channels inhibits lymphocyte activation by reducing calcium influx.

The Kv1.3 and Kv3.1 K(V) channels are upregulated as cells progress toward division.

Store depletion activates plasma membrane calcium channels, which are crucial for sustained calcium signaling.

Calcium oscillations are linked to the opening of calcium and potassium channels and are necessary for activation.

Related Experiment Videos

Purpose Of The Study:

The purpose of this review is to examine the biophysical and regulatory properties of potassium and calcium channels in lymphocytes. The authors aim to understand how these channels influence lymphocyte activation and signaling. By analyzing the roles of K(V) and K(Ca) channels, the study seeks to clarify their contribution to membrane potential and calcium influx. The review focuses on how these channels change during mitogenic stimulation and their impact on lymphocyte function. The authors propose to explore the mechanisms by which channel activity affects intracellular calcium levels and membrane depolarization. They also aim to describe how channel blockade influences lymphocyte activation. The study highlights the importance of single-cell techniques in understanding ion channel dynamics. Ultimately, the review aims to provide insights into the molecular pathways that govern lymphocyte behavior.

Main Methods:

The review utilizes data from patch-clamp experiments to study ion channels in lymphocytes. The authors analyze biophysical properties of K(V) and K(Ca) channels. They incorporate findings from mutational analysis to identify critical regions of channel proteins. Exogenous expression studies are used to determine the roles of specific K(V) channels. The authors also rely on calcium-dependent dyes and fluorescence video techniques. Single-cell fluorescence measurements are employed to track intracellular calcium oscillations. The study references the use of specific channel blockers to assess channel function. The authors integrate data from reporter genes and gene expression studies to explore signaling pathways.

Main Results:

The review identifies two K(V) channels, Kv1.3 and Kv3.1, which are upregulated during lymphocyte activation. Blockade of K(V) and K(Ca) channels inhibits antigen-driven lymphocyte activation. Membrane depolarization caused by channel blockade reduces calcium influx, which is essential for activation. Single-cell fluorescence measurements reveal calcium oscillations linked to channel activity. Store depletion by agents like thapsigargin activates plasma membrane calcium channels. These channels are crucial for sustained calcium signaling in lymphocytes. The study shows that calcium oscillations are closely tied to the opening of calcium and potassium channels. The authors propose that ion channels regulate membrane potential and calcium levels, which in turn influence gene expression.

Conclusions:

The review concludes that potassium and calcium channels are essential for lymphocyte activation and signaling. The authors propose that K(V) and K(Ca) channels regulate membrane potential and calcium influx. Channel blockade disrupts activation by inducing depolarization and reducing calcium entry. Calcium oscillations are linked to channel activity and are necessary for lymphocyte function. The study highlights the role of store-depletion in activating plasma membrane calcium channels. The authors suggest that single-cell techniques can clarify the relationships between ion channels and gene expression. These findings may help explain how ion channels contribute to lymphocyte behavior. The synthesis of current evidence supports the need for further research on ion channel dynamics in lymphocytes.

Single-cell fluorescence measurements are used to track calcium oscillations in lymphocytes.

Ion channels regulate membrane potential and calcium levels, which in turn influence gene expression.