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  • 1
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    Online Resource
    A Low-Frequency Inactivating AKT2 Variant Enriched in the Finnish Population Is Associated With Fasting Insulin Levels and Type 2 Diabetes Risk
    American Diabetes Association ; 2017
    In:  Diabetes Vol. 66, No. 7 ( 2017-07-01), p. 2019-2032
    Details
    In: Diabetes, American Diabetes Association, Vol. 66, No. 7 ( 2017-07-01), p. 2019-2032
    Abstract: To identify novel coding association signals and facilitate characterization of mechanisms influencing glycemic traits and type 2 diabetes risk, we analyzed 109,215 variants derived from exome array genotyping together with an additional 390,225 variants from exome sequence in up to 39,339 normoglycemic individuals from five ancestry groups. We identified a novel association between the coding variant (p.Pro50Thr) in AKT2 and fasting plasma insulin (FI), a gene in which rare fully penetrant mutations are causal for monogenic glycemic disorders. The low-frequency allele is associated with a 12% increase in FI levels. This variant is present at 1.1% frequency in Finns but virtually absent in individuals from other ancestries. Carriers of the FI-increasing allele had increased 2-h insulin values, decreased insulin sensitivity, and increased risk of type 2 diabetes (odds ratio 1.05). In cellular studies, the AKT2-Thr50 protein exhibited a partial loss of function. We extend the allelic spectrum for coding variants in AKT2 associated with disorders of glucose homeostasis and demonstrate bidirectional effects of variants within the pleckstrin homology domain of AKT2.
    Type of Medium: Online Resource
    ISSN: 0012-1797 , 1939-327X
    URL: Article
    DOI: 10.2337/db16-1329
    Language: English
    Publisher: American Diabetes Association
    Publication Date: 2017
    detail.hit.zdb_id: 1501252-9
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  • 2
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    Single-Cell Mapping of GLP-1 and GIP Receptor Expression in the Dorsal Vagal Complex
    American Diabetes Association ; 2021
    In:  Diabetes Vol. 70, No. 9 ( 2021-09-01), p. 1945-1955
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    In: Diabetes, American Diabetes Association, Vol. 70, No. 9 ( 2021-09-01), p. 1945-1955
    Abstract: The dorsal vagal complex (DVC) in the hindbrain, composed of the area postrema, nucleus of the solitary tract, and dorsal motor nucleus of the vagus, plays a critical role in modulating satiety. The incretins glucagon-like peptide 1 (GLP-1) and glucose-dependent insulinotropic polypeptide (GIP) act directly in the brain to modulate feeding, and receptors for both are expressed in the DVC. Given the impressive clinical responses to pharmacologic manipulation of incretin signaling, understanding the central mechanisms by which incretins alter metabolism and energy balance is of critical importance. Here, we review recent single-cell approaches used to detect molecular signatures of GLP-1 and GIP receptor–expressing cells in the DVC. In addition, we discuss how current advancements in single-cell transcriptomics, epigenetics, spatial transcriptomics, and circuit mapping techniques have the potential to further characterize incretin receptor circuits in the hindbrain.
    Type of Medium: Online Resource
    ISSN: 0012-1797 , 1939-327X
    URL: Article
    DOI: 10.2337/dbi21-0003
    Language: English
    Publisher: American Diabetes Association
    Publication Date: 2021
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  • 3
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    Macrophages and Adipocytes in Human Obesity
    American Diabetes Association ; 2009
    In:  Diabetes Vol. 58, No. 7 ( 2009-07-01), p. 1558-1567
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    In: Diabetes, American Diabetes Association, Vol. 58, No. 7 ( 2009-07-01), p. 1558-1567
    Abstract: We investigated the regulation of adipose tissue gene expression during different phases of a dietary weight loss program and its relation with insulin sensitivity. RESEARCH DESIGN AND METHODS Twenty-two obese women followed a dietary intervention program composed of an energy restriction phase with a 4-week very-low-calorie diet and a weight stabilization period composed of a 2-month low-calorie diet followed by 3–4 months of a weight maintenance diet. At each time point, a euglycemic-hyperinsulinemic clamp and subcutaneous adipose tissue biopsies were performed. Adipose tissue gene expression profiling was performed using a DNA microarray in a subgroup of eight women. RT–quantitative PCR was used for determination of mRNA levels of 31 adipose tissue macrophage markers (n = 22). RESULTS Body weight, fat mass, and C-reactive protein level decreased and glucose disposal rate increased during the dietary intervention program. Transcriptome profiling revealed two main patterns of variations. The first involved 464 mostly adipocyte genes involved in metabolism that were downregulated during energy restriction, upregulated during weight stabilization, and unchanged during the dietary intervention. The second comprised 511 mainly macrophage genes involved in inflammatory pathways that were not changed or upregulated during energy restriction and downregulated during weight stabilization and dietary intervention. Accordingly, macrophage markers were upregulated during energy restriction and downregulated during weight stabilization and dietary intervention. The increase in glucose disposal rates in each dietary phase was associated with variation in expression of sets of 80–110 genes that differed among energy restriction, weight stabilization, and dietary intervention. CONCLUSIONS Adipose tissue macrophages and adipocytes show distinct patterns of gene regulation and association with insulin sensitivity during the various phases of a dietary weight loss program.
    Type of Medium: Online Resource
    ISSN: 0012-1797 , 1939-327X
    URL: Article
    DOI: 10.2337/db09-0033
    Language: English
    Publisher: American Diabetes Association
    Publication Date: 2009
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  • 4
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    Online Resource
    An Expanded Genome-Wide Association Study of Type 2 Diabetes in Europeans
    American Diabetes Association ; 2017
    In:  Diabetes Vol. 66, No. 11 ( 2017-11-01), p. 2888-2902
    Details
    In: Diabetes, American Diabetes Association, Vol. 66, No. 11 ( 2017-11-01), p. 2888-2902
    Abstract: To characterize type 2 diabetes (T2D)-associated variation across the allele frequency spectrum, we conducted a meta-analysis of genome-wide association data from 26,676 T2D case and 132,532 control subjects of European ancestry after imputation using the 1000 Genomes multiethnic reference panel. Promising association signals were followed up in additional data sets (of 14,545 or 7,397 T2D case and 38,994 or 71,604 control subjects). We identified 13 novel T2D-associated loci (P & lt; 5 × 10−8), including variants near the GLP2R, GIP, and HLA-DQA1 genes. Our analysis brought the total number of independent T2D associations to 128 distinct signals at 113 loci. Despite substantially increased sample size and more complete coverage of low-frequency variation, all novel associations were driven by common single nucleotide variants. Credible sets of potentially causal variants were generally larger than those based on imputation with earlier reference panels, consistent with resolution of causal signals to common risk haplotypes. Stratification of T2D-associated loci based on T2D-related quantitative trait associations revealed tissue-specific enrichment of regulatory annotations in pancreatic islet enhancers for loci influencing insulin secretion and in adipocytes, monocytes, and hepatocytes for insulin action–associated loci. These findings highlight the predominant role played by common variants of modest effect and the diversity of biological mechanisms influencing T2D pathophysiology.
    Type of Medium: Online Resource
    ISSN: 0012-1797 , 1939-327X
    URL: Article
    DOI: 10.2337/db16-1253
    Language: English
    Publisher: American Diabetes Association
    Publication Date: 2017
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  • 5
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    Online Resource
    1800-P: Transcriptomic Evidence of a Role for Neuron-Glia Interactions in Diabetes Remission Induced by the Central Action of Fibroblast Growth Factor 1 (FGF-1)
    American Diabetes Association ; 2019
    In:  Diabetes Vol. 68, No. Supplement_1 ( 2019-06-01)
    Details
    In: Diabetes, American Diabetes Association, Vol. 68, No. Supplement_1 ( 2019-06-01)
    Abstract: Lasting remission of hyperglycemia can be achieved in rodent models of type 2 diabetes by a single intracerebroventricular (icv) injection of fibroblast growth factor 1 (FGF-1), and the mediobasal hypothalamus (MBH) was recently identified as a target for this effect. To investigate the cellular basis of FGF-1 action in the MBH, we combined whole tissue RNA-sequencing with large-scale single cell and single nuclei RNA-sequencing to generate & gt;60,000 single cell transcriptomes from diabetic ob/ob mice harvested 5d after a single icv injection of either FGF-1 or vehicle. Of the 4 known FGF receptor genes, 3 were expressed in the MBH, primarily by glial cells rather than neurons. Employing weighted gene co-expression network analysis, distinct modules that correlated with icv FGF-1 treatment were identified, again primarily in glial cells. In astrocytes, the response to FGF-1 closely paralleled the neuroprotective “A2” transcriptional phenotype induced by stroke, and both the proportion of differentiating oligodendrocytes and genes involved in extracellular matrix remodeling of the perivascular space were also upregulated by FGF-1. By comparison, the neuronal response to icv FGF-1 was one of generalized inhibition, including decreased expression of Agrp and Pmch (encoding agouti-related peptide and pro-melanin-concentrating hormone (MCH), respectively). Since Agrp and MCH neurons are activated in ob/ob mice, and since this effect predisposes to hyperglycemia, these findings support a model in which sustained inhibition of these and perhaps other neuronal subsets underlies diabetes remission induced by icv FGF-1. Moreover, this neuronal inhibition appears to be driven by neuroprotective glial responses elicited by FGF-1. These data add to growing evidence of a crucial role for neuron-glia interactions in hypothalamic control of glucose homeostasis. Disclosure M.A. Bentsen: None. D. Rausch: None. Z. Mirzadeh: Consultant; Self; Novo Nordisk A/S. J. Scarlett: None. J.M. Brown: None. K.M. Alonge: Research Support; Self; Novo Nordisk Inc. T.H. Meek: Employee; Self; Novo Nordisk Inc. A. Secher: Employee; Spouse/Partner; Gubra. Employee; Self; Novo Nordisk A/S. Speaker's Bureau; Spouse/Partner; Gubra. Stock/Shareholder; Self; Novo Nordisk A/S. R. Jorgensen: Employee; Self; Novo Nordisk A/S. T. Pers: None. M.W. Schwartz: Consultant; Self; Novo Nordisk A/S. Research Support; Self; Novo Nordisk A/S. Funding National Institutes of Health; Novo Nordisk Foundation; Lundbeck Foundation; Novo Nordisk A/S
    Type of Medium: Online Resource
    ISSN: 0012-1797 , 1939-327X
    URL: Article
    DOI: 10.2337/db19-1800-P
    Language: English
    Publisher: American Diabetes Association
    Publication Date: 2019
    detail.hit.zdb_id: 1501252-9
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