The inhibition by oxaliplatin, a platinum-based anti-neoplastic agent, of the activity of intermediate-conductance Ca 2+ -Activated K + channels in human glioma cells

Mei Han Huang, Yan Ming Huang, Sheng-Nan Wu

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Abstract

Oxaliplatin (OXAL) is a third-generation organoplatinum which is effective against advanced cancer cells including glioma cells. How this agent and other related compounds interacts with ion channels in glioma cells is poorly understood. OXAL (100 μM) suppressed the amplitude of whole-cell K + currents (I K ); and, either DCEBIO or ionomycin significantly reversed OXAL-mediated inhibition of I K in human 13-06-MG glioma cells. In OXAL-treated cells, TRAM-34 did not suppress I K amplitude in these cells. The intermediate-conductance Ca 2+ -activated K + (IK Ca ) channels subject to activation by DCEBIO and to inhibition by TRAM-34 or clotrimazole were functionally expressed in these cells. Unlike cisplatin, OXAL decreased the probability of IK Ca -channel openings in a concentration-dependent manner with an IC 50 value of 67 μM. No significant change in single-channel conductance of IK Ca channels in the presence of OXAL was demonstrated. Neither large-conductance Ca 2+ -activated K + channels nor inwardly rectifying K + currents in these cells were affected in the presence of OXAL. OXAL also suppressed the proliferation and migration of 13-06-MG cells in a concentration- and time-dependent manner. OXAL reduced IK Ca -channel activity in LoVo colorectal cancer cells. Taken together, the inhibition by OXAL of IK Ca channels would conceivably be an important mechanism through which it acts on the functional activities of glioma cells occurring in vivo.

Original languageEnglish
Pages (from-to)1390-1406
Number of pages17
JournalCellular Physiology and Biochemistry
Volume37
Issue number4
DOIs
Publication statusPublished - 2015 Oct 5

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oxaliplatin
Platinum
Glioma

All Science Journal Classification (ASJC) codes

  • Physiology

Cite this

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title = "The inhibition by oxaliplatin, a platinum-based anti-neoplastic agent, of the activity of intermediate-conductance Ca 2+ -Activated K + channels in human glioma cells",
abstract = "Oxaliplatin (OXAL) is a third-generation organoplatinum which is effective against advanced cancer cells including glioma cells. How this agent and other related compounds interacts with ion channels in glioma cells is poorly understood. OXAL (100 μM) suppressed the amplitude of whole-cell K + currents (I K ); and, either DCEBIO or ionomycin significantly reversed OXAL-mediated inhibition of I K in human 13-06-MG glioma cells. In OXAL-treated cells, TRAM-34 did not suppress I K amplitude in these cells. The intermediate-conductance Ca 2+ -activated K + (IK Ca ) channels subject to activation by DCEBIO and to inhibition by TRAM-34 or clotrimazole were functionally expressed in these cells. Unlike cisplatin, OXAL decreased the probability of IK Ca -channel openings in a concentration-dependent manner with an IC 50 value of 67 μM. No significant change in single-channel conductance of IK Ca channels in the presence of OXAL was demonstrated. Neither large-conductance Ca 2+ -activated K + channels nor inwardly rectifying K + currents in these cells were affected in the presence of OXAL. OXAL also suppressed the proliferation and migration of 13-06-MG cells in a concentration- and time-dependent manner. OXAL reduced IK Ca -channel activity in LoVo colorectal cancer cells. Taken together, the inhibition by OXAL of IK Ca channels would conceivably be an important mechanism through which it acts on the functional activities of glioma cells occurring in vivo.",
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T1 - The inhibition by oxaliplatin, a platinum-based anti-neoplastic agent, of the activity of intermediate-conductance Ca 2+ -Activated K + channels in human glioma cells

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AU - Huang, Yan Ming

AU - Wu, Sheng-Nan

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N2 - Oxaliplatin (OXAL) is a third-generation organoplatinum which is effective against advanced cancer cells including glioma cells. How this agent and other related compounds interacts with ion channels in glioma cells is poorly understood. OXAL (100 μM) suppressed the amplitude of whole-cell K + currents (I K ); and, either DCEBIO or ionomycin significantly reversed OXAL-mediated inhibition of I K in human 13-06-MG glioma cells. In OXAL-treated cells, TRAM-34 did not suppress I K amplitude in these cells. The intermediate-conductance Ca 2+ -activated K + (IK Ca ) channels subject to activation by DCEBIO and to inhibition by TRAM-34 or clotrimazole were functionally expressed in these cells. Unlike cisplatin, OXAL decreased the probability of IK Ca -channel openings in a concentration-dependent manner with an IC 50 value of 67 μM. No significant change in single-channel conductance of IK Ca channels in the presence of OXAL was demonstrated. Neither large-conductance Ca 2+ -activated K + channels nor inwardly rectifying K + currents in these cells were affected in the presence of OXAL. OXAL also suppressed the proliferation and migration of 13-06-MG cells in a concentration- and time-dependent manner. OXAL reduced IK Ca -channel activity in LoVo colorectal cancer cells. Taken together, the inhibition by OXAL of IK Ca channels would conceivably be an important mechanism through which it acts on the functional activities of glioma cells occurring in vivo.

AB - Oxaliplatin (OXAL) is a third-generation organoplatinum which is effective against advanced cancer cells including glioma cells. How this agent and other related compounds interacts with ion channels in glioma cells is poorly understood. OXAL (100 μM) suppressed the amplitude of whole-cell K + currents (I K ); and, either DCEBIO or ionomycin significantly reversed OXAL-mediated inhibition of I K in human 13-06-MG glioma cells. In OXAL-treated cells, TRAM-34 did not suppress I K amplitude in these cells. The intermediate-conductance Ca 2+ -activated K + (IK Ca ) channels subject to activation by DCEBIO and to inhibition by TRAM-34 or clotrimazole were functionally expressed in these cells. Unlike cisplatin, OXAL decreased the probability of IK Ca -channel openings in a concentration-dependent manner with an IC 50 value of 67 μM. No significant change in single-channel conductance of IK Ca channels in the presence of OXAL was demonstrated. Neither large-conductance Ca 2+ -activated K + channels nor inwardly rectifying K + currents in these cells were affected in the presence of OXAL. OXAL also suppressed the proliferation and migration of 13-06-MG cells in a concentration- and time-dependent manner. OXAL reduced IK Ca -channel activity in LoVo colorectal cancer cells. Taken together, the inhibition by OXAL of IK Ca channels would conceivably be an important mechanism through which it acts on the functional activities of glioma cells occurring in vivo.

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