Regulated and Aberrant Glycosylation Modulate Cardiac Electrical Signaling
Regulated and aberrant glycosylation modulate cardiac electrical signaling Marty L. Montpetita, Patrick J. Stockera, Tara A. Schwetza, Jean M. Harpera, Sarah A. Norringa, Lana Schafferb, Simon J. Northc, Jihye Jang-Leec, Timothy Gilmartinb, Steven R. Headb, Stuart M. Haslamc, Anne Dellc, Jamey D. Marthd, and Eric S. Bennetta,1 aDepartment of Molecular Pharmacology & Physiology, Programs in Cardiovascular Sciences and Neuroscience, University of South Florida College of Medicine, Tampa, FL 33612; bDNA Microarray Core, The Scripps Research Institute, La Jolla, CA 92037; and cDivision of Molecular Biosciences, Imperial College London, London SW7 2AZ, United Kingdom; and dDepartment of Cellular and Molecular Medicine, The Howard Hughes Medical Institute, University of California at San Diego, La Jolla, CA 92093 Edited by Richard W, Aldrich, University of Texas, Austin, TX, and approved July 2, 2009 (received for review May 18, 2009) Millions afflicted with Chagas disease and other disorders of aberrant phied and more susceptible to arrhythmias (3). Electrical remod- glycosylation suffer symptoms consistent with altered electrical sig- eling occurs during development and aging, among species, and naling such as arrhythmias, decreased neuronal conduction velocity, throughout the heart (4, 5). In nearly all cardiac pathologies and hyporeflexia. Cardiac, neuronal, and muscle electrical signaling is including hypertrophy, heart failure, and long QT syndrome controlled and modulated by changes in voltage-gated ion channel (LQTS), at least one type of remodeling occurs (3, 6). activity that occur through physiological and pathological processes Voltage-gated ion channels are heavily glycosylated, with such as development, epilepsy, and cardiomyopathy. Glycans at- glycan structures comprising upwards of 30% of the mature channel mass (7, 8).
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