title: Maternal high-fat diet impairs cardiac function in offspring of diabetic pregnancy through metabolic stress and mitochondrial dysfunction.
abstract: Offspring of diabetic pregnancies are at risk of cardiovascular disease at birth and throughout life, purportedly through fuel-mediated influences on the developing heart. Preventative measures focus on glycemic control, but the contribution of additional offenders, including lipids, is not understood. Cellular bioenergetics can be influenced by both diabetes and hyperlipidemia and play a pivotal role in the pathophysiology of adult cardiovascular disease. This study investigated whether a maternal high-fat diet, independently or additively with diabetes, could impair fuel metabolism, mitochondrial function, and cardiac physiology in the developing offspring's heart. Sprague-Dawley rats fed a control or high-fat diet were administered placebo or streptozotocin to induce diabetes during pregnancy and then delivered offspring from four groups: control, diabetes exposed, diet exposed, and combination exposed. Cardiac function, cellular bioenergetics (mitochondrial stress test, glycolytic stress test, and palmitate oxidation assay), lipid peroxidation, mitochondrial histology, and copy number were determined. Diabetes-exposed offspring had impaired glycolytic and respiratory capacity and a reduced proton leak. High-fat diet-exposed offspring had increased mitochondrial copy number, increased lipid peroxidation, and evidence of mitochondrial dysfunction. Combination-exposed pups were most severely affected and demonstrated cardiac lipid droplet accumulation and diastolic/systolic cardiac dysfunction that mimics that of adult diabetic cardiomyopathy. This study is the first to demonstrate that a maternal high-fat diet impairs cardiac function in offspring of diabetic pregnancies through metabolic stress and serves as a critical step in understanding the role of cellular bioenergetics in developmentally programmed cardiac disease.
authors.affiliation: Children's Health Research Center, Sanford Research, Sioux Falls, South Dakota;
authors.forename: Kennedy S
authors.initials: KS
authors.lastname: Mdaki
authors.affiliation: Children's Health Research Center, Sanford Research, Sioux Falls, South Dakota;
authors.forename: Tricia D
authors.initials: TD
authors.lastname: Larsen
authors.affiliation: Children's Health Research Center, Sanford Research, Sioux Falls, South Dakota;
authors.forename: Angela L
authors.initials: AL
authors.lastname: Wachal
authors.affiliation: Sanford School of Medicine-University of South Dakota, Sioux Falls, South Dakota;
authors.forename: Michelle D
authors.initials: MD
authors.lastname: Schimelpfenig
authors.affiliation: Sanford School of Medicine-University of South Dakota, Sioux Falls, South Dakota;
authors.forename: Lucinda J
authors.initials: LJ
authors.lastname: Weaver
authors.affiliation: Children's Health Research Center, Sanford Research, Sioux Falls, South Dakota;
authors.forename: Samuel D R
authors.initials: SD
authors.lastname: Dooyema
authors.affiliation: Augustana University, Sioux Falls, South Dakota; and.
authors.forename: Eli J
authors.initials: EJ
authors.lastname: Louwagie
authors.affiliation: Children's Health Research Center, Sanford Research, Sioux Falls, South Dakota; Sanford School of Medicine-University of South Dakota, Sioux Falls, South Dakota; Children's Health Specialty Clinic, Sanford Children's Hospital, Sioux Falls, South Dakota michelle.baack@sanfordhealth.org.
authors.forename: Michelle L
authors.identifier: http://orcid.org/0000-0001-5966-669X
authors.initials: ML
authors.lastname: Baack
mesh_terms: D000818:Animals; D000831:Animals, Newborn; D019069:Cell Respiration; D004272:DNA, Mitochondrial / Q000378:metabolism; D003921:Diabetes Mellitus, Experimental / Q000378:metabolism* / Q000473:pathology; D016640:Diabetes, Gestational / Q000378:metabolism* / Q000473:pathology; D059305:Diet, High-Fat; D004452:Echocardiography; D005260:Female; D006019:Glycolysis; D006321:Heart / Q000503:physiopathology*; D015227:Lipid Peroxidation; D008929:Mitochondria, Heart / Q000378:metabolism* / Q000473:pathology; D032383:Myocytes, Cardiac / Q000473:pathology*; D011247:Pregnancy; D051381:Rats; D017207:Rats, Sprague-Dawley; D013312:Stress, Physiological
chemical_list: D004272:DNA, Mitochondrial
keywords: cardiac bioenergetics; developmental programming; diabetic cardiomyopathy; diabetic pregnancy; maternal high-fat diet; mitochondrial dysfunction; proton production rate