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Updated: Jul 11, 2026

Assessment of Mitochondrial Functions and Cell Viability in Renal Cells Overexpressing Protein Kinase C Isozymes
Published on: January 7, 2013
LTRPC7 is a Mg.ATP-regulated divalent cation channel required for cell viability
M J Nadler1, M C Hermosura, K Inabe
1Department of Pathology, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, Massachusetts 02215, USA.
Researchers identified the LTRPC7 channel, a crucial protein regulating calcium and magnesium entry into cells. Its essential role in cell survival highlights its importance in cellular physiology and metabolic regulation.
Area of Science:
- Cellular Biology
- Ion Channel Physiology
- Molecular Mechanisms
Background:
- Basal entry of divalent cations into mammalian cells is poorly understood.
- The role of specific ion channels in regulating these fluxes remains largely uncharacterized.
Purpose of the Study:
- To clone and functionally characterize a novel divalent cation channel, LTRPC7.
- To elucidate the role of LTRPC7 in cellular physiology and its regulation by intracellular nucleotides.
Main Methods:
- Cloning and functional expression of LTRPC7 in HEK-293 cells.
- Electrophysiological analysis to determine channel properties.
- Targeted gene deletion in DT-40 B cells to assess physiological importance.
Main Results:
- LTRPC7 is a Ca2+- and Mg2+-permeable channel.
- Deletion of LTRPC7 in DT-40 B cells resulted in lethality.
- Overexpression in HEK-293 cells revealed Mg.ATP/Mg.GTP-regulated currents with divalent cation permeability.
- Magnesium-nucleotide-regulated metal ion currents (MagNuM) in native cells mirror LTRPC7 properties.
Conclusions:
- LTRPC7 plays a fundamental and nonredundant role in cellular physiology.
- The channel's sensitivity to Mg.ATP suggests a role in linking cellular metabolism to divalent cation flux.
- LTRPC7 may be a key regulator of plasma membrane divalent cation homeostasis.
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