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Nonselective cation channels in intact human T lymphocytes
1Department of Physiology, University of Toronto, Ont., Canada.
Canadian Journal of Physiology and Pharmacology
|February 1, 1992
Summary
Nonselective cation channels were identified in human T lymphocytes, exhibiting activity under hypotonic conditions. These channels show poor selectivity for sodium and potassium ions and are blocked by quinine.
Area of Science:
- Immunology
- Cell Biology
- Biophysics
Background:
- Human T lymphocytes possess ion channels crucial for cellular function.
- Understanding ion channel activity is vital for T cell physiology.
Purpose of the Study:
- To characterize nonselective cation channels in human T lymphocytes.
- To investigate channel activity under hypotonic stress and voltage changes.
Main Methods:
- Single channel recordings using cell-attached and excised patches on human T lymphocytes.
- Ionic gradient manipulations and voltage clamp techniques.
- Application of quinine as a channel blocker.
Main Results:
- Nonselective cation channels were detected in 20 of 23 patches from human T lymphocytes.
- Channels displayed linear current-voltage relations for outward currents (11-14 pS) and inward rectification (up to 23 pS).
- Channel activity was voltage-dependent, closing at hyperpolarized potentials and blocked at depolarized potentials; quinine rapidly blocked active channels.
Conclusions:
- Human T lymphocytes express nonselective cation channels permeable to both Na+ and K+.
- These channels are voltage-dependent and sensitive to quinine.
- Further investigation is needed to confirm their role in cell swelling.