Expression of potassium channels is relevant for cell survival and migration in a murine bone marrow stromal cell line

• Published in: Journal of cellular physiology Vol. 234; no. 10; pp. 18086 - 18097
• Main Authors: Silva, Henrique B., Rodrigues, Deivid C., Andrade, Raiana, Teixeira, Gabriel H. G. S. F., Stelling, Mariana P., Ponte, Cristiano G., Nascimento, José H. M., Campos de Carvalho, Antonio C., Medei, Emiliano
• Format: Journal Article
• Language: English
• Published: United States Wiley Subscription Services, Inc 01-10-2019
• Subjects: Animals; Bone marrow; Cell Line; Cell migration; Cell Movement - drug effects; Cell Survival; Cell viability; Channel gating; electrophysiology; Hematopoiesis; Homeostasis; Ion Channel Gating; Ion channels; Ion currents; Kinetics; Membrane Potentials; Mesenchymal Stem Cells - drug effects; Mesenchymal Stem Cells - metabolism; Mice; migration; mouse bone marrow stromal cell; patch‐clamp; Pharmacology; Polymerase chain reaction; Potassium; Potassium - metabolism; Potassium Channel Blockers - pharmacology; Potassium channels; Potassium channels (delayed-rectifying); Potassium Channels - drug effects; Potassium Channels - genetics; Potassium Channels - metabolism; Potassium currents; Reaction kinetics; Rectifiers; Reverse transcription; S17; Signal Transduction; Survival; Tetraethylammonium; Wound healing; potassium currents; cell viability; mouse bone marrow stromal cell; electrophysiology; patch-clamp; S17; migration; cell line
• ISSN: 0021-9541; 1097-4652
• DOI: 10.1002/jcp.28441

S17 is a clonogenic bone marrow stromal (BMS) cell line derived from mouse that has been extensively used to assess both human and murine hematopoiesis support capacity. However, very little is known about the expression of potassium ion channels and their function in cell survival and migration in these cells. Thus, the present study was designed to characterize potassium ion channels using electrophysiological and molecular biological approaches in S17 BMS cells. The whole‐cell configuration of the patch clamp technique has been applied to identify potassium ion currents and reverse transcription polymerase chain reaction (RT‐PCR) used to determine their molecular identities. Based on gating kinetics and pharmacological modulation of the macroscopic currents we found the presence of four functional potassium ion channels in S17 BMS cells. These include a current rapidly activated and inactivated, tetraethylammonium‐sensitive, (IKV) in most (50%) cells; a fast activated and rapidly inactivating A‐type K
+ current (IK
A‐like); a delayed rectifier K
+ current (IK
DR) and an inward rectifier potassium current (IK
IR), found in, respectively 4.5%, 26% and 24% of these cells. RT‐PCR confirmed the presence of mRNA transcripts for the alpha subunit of the corresponding functional ion channels. Additionally, functional assays were performed to investigate the importance of potassium currents in cell survival and migration. 3‐(4,5‐Dimethylthiazol‐2‐yl)‐2,5‐diphenyltetrazolium bromide analyses revealed a reduction in cell viability, while wound healing assays revealed reduced migration potential in cells incubated with different potassium channel blockers. In conclusion, our data suggested that potassium currents might play a role in the maintenance of overall S17 cell ionic homeostasis directly affecting cell survival and migration.
Potassium channel on mesenchymal stem cells.