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Transmembrane potential responses during HL-60 promyelocyte differentiation
L H Brent1, B Rubenstein, Q H Gong
1Department of Medicine, Hahnemann University, Philadelphia, Pennsylvania 19102, USA.
Journal of Cellular Physiology
|July 1, 1996
Summary
HL-60 cell differentiation alters ion channel expression, changing how myeloid cells respond to stimuli. This impacts inflammatory responses in granulocytes and monocyte/macrophages.
Area of Science:
- Cell Biology
- Immunology
- Physiology
Background:
- Myeloid cells, including granulocytes and monocyte/macrophages, are crucial in inflammatory reactions.
- These cells originate from promyelocytes, and the HL-60 cell line serves as a model for studying myelomonocytic differentiation.
Purpose of the Study:
- To investigate if lineage-specific ion channel expression during HL-60 cell differentiation leads to altered functional responses to external stimuli.
- To understand the role of ion channels in the transmembrane potential changes of differentiating myeloid cells.
Main Methods:
- Utilized the HL-60 human promyelocytic cell line, differentiating it into granulocytes (PMNs) and monocytes.
- Measured transmembrane potential responses using the dye diSBAC2-(3) upon stimulation with ionomycin and ATP.
- Employed ion substitutions and channel blockers to elucidate the mechanisms of ion channel activity.
Main Results:
- HL-60 promyelocytes showed hyperpolarization mediated by KCa channels in response to ionomycin/ATP.
- Differentiation into PMNs resulted in a shift from hyperpolarization to depolarization.
- HL-60-derived monocytes exhibited hyperpolarization and an ATP-induced Cl- conductance.
Conclusions:
- Lineage-specific ion channel expression during HL-60 cell differentiation dictates transmembrane potential responses.
- These changes in ion channel activity are critical for the functional responses of myelomonocytic cells in inflammatory conditions.