Abstract
Cationic amino acid transporters (CATs) play a central role in the supply of the substrate L-arginine to intracellular nitric oxide synthases (NOS), the enzymes responsible for the synthesis of nitric oxide (NO). In heart, NO produced by cardiac myocytes has diverse and even opposite effects on myocardial contractility depending on the subcellular location of its production. Approximately a decade ago, using a combination of biophysical and biochemical approaches, we discovered and characterized high- and low-affinity CATs that function simultaneously in the cardiac myocyte plasma membrane. Later on, we reported a negative feedback regulation of NO on the activity of cardiac CATs. In this way, NO was found to modulate its own biosynthesis by regulating the amount of L-arginine that becomes available as NOS substrate. We have recently solved the molecular determinants for this NO regulation on the low-affinity high-capacity CAT-2A. This review highlights some biophysical and biochemical features of L-arginine transporters and their potential relation to cardiac muscle physiology and pathology.
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Acknowledgements
Dr. Pablo Dans’ help in making the artwork for figure 3 is gratefully acknowledged. R.D. Peluffo is an established investigator from the Program for the Development of the Basic Sciences (PEDECIBA, Uruguay) and the Uruguayan National Agency for Research and Innovation (ANII).
Funding
This work was supported over the years by the National Heart, Lung, and Blood Institute (Grant R01-HL-076392) and by a Scientist Development Grant from the American Heart Association, National branch.
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Peluffo, R.D. Cationic amino acid transporters and their modulation by nitric oxide in cardiac muscle cells. Biophys Rev 13, 1071–1079 (2021). https://doi.org/10.1007/s12551-021-00870-1
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DOI: https://doi.org/10.1007/s12551-021-00870-1