Abstract:
:Myeloid cells, including granulocytes and monocyte/macrophages, are important in disease-associated inflammatory reactions. These cells come from a common progenitor, the promyelocyte. The human promyelocytic cell line, HL-60, can be induced to terminally differentiate into granulocytes or monocyte/ macrophages in a controlled fashion providing a model to study various aspects of myelomonocytic differentiation. The expression of several ion channels is controlled in HL-60 cells in a differentiation specific pattern. The purpose of this study was to determine if lineage-specific ion channel expression during HL-60 differentiation resulted in differences in functional responses to external stimuli. This was investigated by examining transmembrane potential responses in HL-60 promyelocytes, HL-60-derived polymorphonuclear cells (PMNs), and monocytes to various stimuli using the transmembrane potential sensitive dye, diSBAC2-(3). Exposure of HL-60 promyelocytes to ionomycin or ATP produced a membrane hyperpolarization. Studies using ion substitutions and ion channel blockers indicate that the hyperpolarization was mediated by KCa channels. During HL-60 promyelocyte differentiation to PMNs, the membrane potential response to ionomycin and ATP shifted from a hyperpolarization to a depolarization over 7 days. Conversely, HL-60-derived monocytes exhibited a membrane hyperpolarization in response to ionomycin and ATP. HL-60-derived monocytes also exhibit a Cl- conductance specifically induced by ATP. Lineage-specific expression of ion channels during HL-60 cell differentiation is important in determining the transmembrane potential response of these cells. This may be translated into functional responses of various myelomonocytic cells during disease-associated inflammatory reactions.
journal_name
J Cell Physioljournal_title
Journal of cellular physiologyauthors
Brent LH,Rubenstein B,Gong QH,Wieland SJdoi
10.1002/(SICI)1097-4652(199607)168:1<155::AID-JCP1subject
Has Abstractpub_date
1996-07-01 00:00:00pages
155-65issue
1eissn
0021-9541issn
1097-4652pii
10.1002/(SICI)1097-4652(199607)168:1<155::AID-JCP1journal_volume
168pub_type
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