Single-Nucleus RNA Sequencing of the Hypothalamic Arcuate Nucleus of C57BL/6J Mice After Prolonged Diet-Induced Obesity. Hypertension 2020 Aug;76(2):589-597
Date
06/09/2020Pubmed ID
32507042Pubmed Central ID
PMC7347451DOI
10.1161/HYPERTENSIONAHA.120.15137Scopus ID
2-s2.0-85087901067 (requires institutional sign-in at Scopus site) 22 CitationsAbstract
Prolonged obesity is associated with blunted feeding and thermogenic autonomic responses to leptin, but cardiovascular responses to leptin are maintained. This state of selective leptin resistance is, therefore, proposed to contribute to the pathogenesis and maintenance of obesity-associated hypertension. Cells of the arcuate nucleus of the hypothalamus detect leptin, and although the cellular and molecular mechanisms remain unclear, altered arcuate nucleus biology is hypothesized to contribute to selective leptin resistance. Male C57BL/6J mice were fed a high-fat diet (HFD) or chow from 8 to 18 weeks of age, as this paradigm models selective leptin resistance. Nuclei were then isolated from arcuate nucleus for single-nucleus RNA sequencing. HFD caused expected gains in adiposity and circulating leptin. Twenty-three unique cell-type clusters were identified, and Ingenuity Pathway Analysis was used to explore changes in gene expression patterns due to chronic HFD within each cluster. Notably, gene expression signatures related to leptin signaling exhibited suppression predominantly in neurons identified as the Agouti-related peptide (Agrp) subtype. Ingenuity Pathway Analysis results were also consistent with alterations in CREB (cAMP response element-binding protein) signaling in Agrp neurons after HFD, and reduced phosphorylated CREB was confirmed in arcuate nucleus after prolonged HFD by capillary electrophoresis-based Western blotting. These findings support the concept that prolonged HFD-induced obesity is associated with selective changes in Agrp neuron biology, possibly secondary to altered CREB signaling.
Author List
Deng G, Morselli LL, Wagner VA, Balapattabi K, Sapouckey SA, Knudtson KL, Rahmouni K, Cui H, Sigmund CD, Kwitek AE, Grobe JLAuthors
Justin L. Grobe PhD Professor in the Physiology department at Medical College of WisconsinAnne E. Kwitek PhD Professor in the Physiology department at Medical College of Wisconsin
Lisa Morselli MD, PhD Assistant Professor in the Medicine department at Medical College of Wisconsin
Curt Sigmund PhD Chair, Professor in the Physiology department at Medical College of Wisconsin
Valerie Wagner Research Scientist I in the Physiology department at Medical College of Wisconsin
MESH terms used to index this publication - Major topics in bold
AdiposityAgouti-Related Protein
Animals
Arcuate Nucleus of Hypothalamus
Cyclic AMP Response Element-Binding Protein
Diet, High-Fat
Leptin
Male
Mice
Neurons
Obesity
Phosphorylation
Sequence Analysis, RNA
Signal Transduction
