Pankaj Arora1, Connie Wu2,3,4, Tariq Hamid1, Garima Arora1, Obiajulu Agha3, Kaitlin Allen3, Robert E T Tainsh3, Dongjian Hu2,5, Romy A Ryan2, Ibrahim J Domian2,6, Emmanuel S Buys3, Donald B Bloch3,7, Sumanth D Prabhu1, Kenneth D Bloch2,3, Christopher Newton-Cheh2,4,8, Thomas J Wang9,10. 1. Division of Cardiovascular Disease, Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama. 2. Cardiovascular Research Center, Department of Medicine, Massachusetts General Hospital Research Institute, Harvard Medical School, Boston, Massachusetts. 3. Anesthesia Center for Critical Care Research, Department of Anesthesia, Critical Care, and Pain Medicine, Massachusetts General Hospital Research Institute, Harvard Medical School, Boston, Massachusetts. 4. Program in Medical and Population Genetics, Broad Institute of Harvard and MIT, Cambridge, Massachusetts. 5. Department of Biomedical Engineering, Boston University, Boston, Massachusetts. 6. Harvard Stem Cell Institute, Cambridge, Massachusetts. 7. Division of Rheumatology, Allergy and Immunology, Department of Medicine, Massachusetts General Hospital Research Institute, Harvard Medical School, Boston, Massachusetts. 8. Center for Human Genetic Research, Massachusetts General Hospital Research Institute, Harvard Medical School, Boston, Massachusetts. 9. Division of Cardiovascular Medicine, Vanderbilt University, Nashville, Tennessee. 10. Vanderbilt Translational and Clinical Cardiovascular Research Center, Vanderbilt University, Nashville, Tennessee.
Abstract
BACKGROUND: The cardiac natriuretic peptides (NPs), atrial natriuretic peptide (ANP) and B-type natriuretic peptide (BNP), have central roles in sodium and blood pressure regulation. Extracardiac factors (e.g., obesity and diabetes) influence NP production, potentially altering cardiovascular responses to volume and pressure stress. OBJECTIVES: This study examined the effects of acute carbohydrate intake on the NP system in humans, and investigated underlying mechanisms. METHODS: Normotensive subjects (N = 33) were given a high-carbohydrate shake. Venous blood was sampled to measure N-terminal (NT)-proANP and NT-proBNP levels. Human embryonic stem cell-derived cardiomyocytes (hESC-CMs) and HepG2 cells were treated with glucose, and expression levels of NPs and micro ribonucleic acid 425 (miR-425), a negative regulator of ANP, were examined. The role of nuclear factor kappa B (NF-κB) in the glucose-mediated effects was investigated using a NF-κB inhibitor and expression plasmids encoding NF-κB subunits. RESULTS: We observed a 27% reduction in the levels of circulating NT-proANP (p < 0.001, maximal at 6 h) after carbohydrate challenge, with no effect on NT-proBNP levels in our human subjects. Glucose treatment of hESC-CMs for 6 h and 24 h increased levels of the primary transcript of miR-425 (pri-miR-425) and mature miR-425. A corresponding decrease in NPPA messenger RNA levels was also observed at both time points. Overexpression of NF-κB subunits in H9c2 cardiomyocytes increased miR-425 levels, whereas inhibition of NF-κB abrogated the glucose-mediated increase in pri-miR-425 levels in HepG2 cells. CONCLUSIONS: Acute carbohydrate challenge is associated with a reduction in ANP production. The mechanism appears to involve a glucose-induced increase in the expression of miR-425, mediated by NF-κB signaling.
BACKGROUND: The cardiac natriuretic peptides (NPs), atrial natriuretic peptide (ANP) and B-type natriuretic peptide (BNP), have central roles in sodium and blood pressure regulation. Extracardiac factors (e.g., obesity and diabetes) influence NP production, potentially altering cardiovascular responses to volume and pressure stress. OBJECTIVES: This study examined the effects of acute carbohydrate intake on the NP system in humans, and investigated underlying mechanisms. METHODS: Normotensive subjects (N = 33) were given a high-carbohydrate shake. Venous blood was sampled to measure N-terminal (NT)-proANP and NT-proBNP levels. Human embryonic stem cell-derived cardiomyocytes (hESC-CMs) and HepG2 cells were treated with glucose, and expression levels of NPs and micro ribonucleic acid 425 (miR-425), a negative regulator of ANP, were examined. The role of nuclear factor kappa B (NF-κB) in the glucose-mediated effects was investigated using a NF-κB inhibitor and expression plasmids encoding NF-κB subunits. RESULTS: We observed a 27% reduction in the levels of circulating NT-proANP (p < 0.001, maximal at 6 h) after carbohydrate challenge, with no effect on NT-proBNP levels in our human subjects. Glucose treatment of hESC-CMs for 6 h and 24 h increased levels of the primary transcript of miR-425 (pri-miR-425) and mature miR-425. A corresponding decrease in NPPA messenger RNA levels was also observed at both time points. Overexpression of NF-κB subunits in H9c2 cardiomyocytes increased miR-425 levels, whereas inhibition of NF-κB abrogated the glucose-mediated increase in pri-miR-425 levels in HepG2 cells. CONCLUSIONS: Acute carbohydrate challenge is associated with a reduction in ANP production. The mechanism appears to involve a glucose-induced increase in the expression of miR-425, mediated by NF-κB signaling.
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