Systems and methods of voltage-gated ion channel assays

a technology of voltage-gated ion channels and assays, which is applied in the field of systems and methods of voltage-gated ion channel assays, can solve problems such as interference with the proper operation of these voltage-gated ion channels

Inactive Publication Date: 2008-02-21
CHARLES STARK DRAPER LABORATORY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Various compounds are known to interfere with the proper operation of these voltage-gated ion channels.

Method used

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  • Systems and methods of voltage-gated ion channel assays
  • Systems and methods of voltage-gated ion channel assays
  • Systems and methods of voltage-gated ion channel assays

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example 1

[0083]In one particular example, a cell assay system built in accordance with principles of the invention can be used to conduct hERG screening assays. The hERG gene regulates the activity of potassium ion channels in cardiac myocyte cells. In a functioning heart, electrical voltages are generated by modified myocytes in the sinoatrial and atrioventricular nodes (pacemaking nodes). Such voltages are propagated through the heart by the action of various voltage-gated ion channels that alter the voltage gradients across cardiac cell membranes by exchanging sodium, calcium, and potassium ions across the cell membrane. Various agents are known to interfere with the hERG gene, or otherwise block potassium channel operation, resulting in arrhythmia and potentially heart failure. Thus, when testing various agents for toxicity, one useful test includes testing for interference with cardiac cell potassium channels.

[0084]To test for potassium channel interference, cardiac myocyte cells are pr...

example 2

[0087]FIGS. 11A and 11B are charts depicting fluorescence data observed from sodium ion selective optical ion sensor particles introduced into the interior of HL-1 cardiac cells. Electrodes energized at a frequency of 1.0 Hz stimulate the cells. As the cells beat, sodium channels in the cells open and close, allowing sodium ions to move in and out of the cells. As the sodium concentration in the intracellular environment changes, the fluorescence of the optical ion sensor changes. FIG. 11A illustrates the averaged raw and filtered normalized fluorescence data indicative of sodium concentration in the HL-1 cells. FIG. 11B illustrates the fluorescence oscillation amplitude by frequency.

[0088]The optical ion sensors used to obtain the experimental data for FIGS. 10A-10D and FIGS. 11A and 11B fluoresce primarily at a wavelength of 670 nm. To simultaneously observe extracellular potassium and intracellular sodium, the potassium-selective optical ion sensors can be formulated with chromio...

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Abstract

Systems and methods are provided for optically measuring ion concentrations in biological samples. The systems and methods employ polymer-based optical ion sensors that include ion-selective ionophores and a pH sensitive chromionophore. Electrodes are providing for electrically stimulating the biological samples.

Description

REFERENCE TO RELATED APPLICATIONS[0001]This application claims priority under 35 U.S.C. §119(e) to United States Provisional Application No. 60 / 838,647, entitled, “High Throughput Optical Sensor Arrays for Drug Screening,” filed on Aug. 17, 2006, the entirety of which is hereby incorporated by reference.BACKGROUND OF THE INVENTION[0002]Electrically stimulated voltage-gated ion channels control many of the most basic functions in the human body, including the contraction of muscle cells and the propagation of nervous system signals via muscle and nerve cells. Various compounds are known to interfere with the proper operation of these voltage-gated ion channels.SUMMARY OF THE INVENTION[0003]In one aspect, the invention relates to a cell assay system suitable for observing the impact of agents on the functioning of voltage-gated ion channels in electrically stimulated cells. In one embodiment the cell assay system includes a post that has a distal end sized for introduction into a biol...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C12N13/00
CPCC12N13/00G01N21/6428Y10S435/808G01N21/80G01N33/84G01N21/6452
Inventor HARJES, DANIEL I.CLARK, HEATHER A.
Owner CHARLES STARK DRAPER LABORATORY
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