BACKGROUND: Epidemiological studies show that maternal diabetes predisposes offspring to cardiovascular and metabolic disorders. However, the precise mechanisms for the underlying penetrance and disease predisposition remain poorly understood. We examined whether hypoxia-inducible factor 1 alpha, in combination with exposure to a diabetic intrauterine environment, influences the function and molecular structure of the adult offspring heart. METHODS AND RESULTS: In a mouse model, we demonstrated that haploinsufficient (Hif1a+/-) offspring from a diabetic pregnancy developed left ventricle dysfunction at 12 weeks of age, as manifested by decreased fractional shortening and structural remodeling of the myocardium. Transcriptional profiling by RNA-seq revealed significant transcriptome changes in the left ventricle of diabetes-exposed Hif1a+/- offspring associated with development, metabolism, apoptosis, and blood vessel physiology. In contrast, both wild type and Hif1a+/- offspring from diabetic pregnancies showed changes in immune system processes and inflammatory responses. Immunohistochemical analyses demonstrated that the combination of haploinsufficiency of Hif1a and exposure to maternal diabetes resulted in impaired macrophage infiltration, increased levels of advanced glycation end products, and changes in vascular homeostasis in the adult offspring heart. CONCLUSIONS: Together our findings provide evidence that a global reduction in Hif1a gene dosage increases predisposition of the offspring exposed to maternal diabetes to cardiac dysfunction, and also underscore Hif1a as a critical factor in the fetal programming of adult cardiovascular disease.

EMBL Genomics Core Facility Meyerhofstr 1 69117 Heidelberg Germany

Faculty of Science Charles University Prague Czechia

Institute of Anatomy 1st Faculty of Medicine Charles University Prague Czechia

Institute of Physiology CAS Prague Czechia

Laboratory of Gene Expression Institute of Biotechnology CAS BIOCEV Vestec Czechia

Laboratory of Molecular Pathogenetics Institute of Biotechnology CAS BIOCEV Center of Excellence Prumyslova 595 25250 Vestec Czechia

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