Tumor cell membranes have multiple components that participate in the process of metastasis. The present study investigates the physical association of β1-integrins and Kv1.3 voltage-gated potassium channels in melanoma cell membranes using resonance energy transfer (RET) techniques. RET between donor-labeled anti–β1-integrin and acceptor-labeled anti-Kv1.3 channels was detected on LOX cells adherent to glass and fibronectin-coated coverslips. However, RET was not observed on LOX cells in suspension, indicating that molecular proximity of these membrane molecules is adherence-related. Several K+ channel blockers, including tetraethylammonium, 4-aminopyridine, and verapamil, inhibited RET between β1-integrins and Kv1.3 channels. However, the irrelevant K+ channel blocker apamin had no effect on RET between β1-integrins and Kv1.3 channels. Based on these findings, we speculate that the lateral association of Kv1.3 channels with β1-integrins contributes to the regulation of integrin function and that channel blockers might affect tumor cell behavior by influencing the assembly of supramolecular structures containing integrins.
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1 July 2002
Article|
June 10 2002
Molecular Proximity of Kv1.3 Voltage-gated Potassium Channels and β1-Integrins on the Plasma Membrane of Melanoma Cells : Effects of Cell Adherence and Channel Blockers
Vira V. Artym,
Vira V. Artym
Department of Biological Sciences, Wayne State University, Detroit, MI 48202
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Howard R. Petty
Howard R. Petty
Department of Biological Sciences, Wayne State University, Detroit, MI 48202
Search for other works by this author on:
Vira V. Artym
Department of Biological Sciences, Wayne State University, Detroit, MI 48202
Howard R. Petty
Department of Biological Sciences, Wayne State University, Detroit, MI 48202
Address correspondence to Dr. Howard R. Petty, Department of Biological Sciences, Wayne State University, Detroit, MI 48202. Fax: (313) 577-9008; E-mail: [email protected]
*
Abbreviations used in this paper: 4-AP, 4-aminopyridine; RET, resonance energy transfer; TEA, tetraethylammonium.
Received:
April 11 2002
Accepted:
May 16 2002
Online ISSN: 1540-7748
Print ISSN: 0022-1295
The Rockefeller University Press
2002
J Gen Physiol (2002) 120 (1): 29–37.
Article history
Received:
April 11 2002
Accepted:
May 16 2002
Citation
Vira V. Artym, Howard R. Petty; Molecular Proximity of Kv1.3 Voltage-gated Potassium Channels and β1-Integrins on the Plasma Membrane of Melanoma Cells : Effects of Cell Adherence and Channel Blockers . J Gen Physiol 1 July 2002; 120 (1): 29–37. doi: https://doi.org/10.1085/jgp.20028607
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