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Groop P.-H.,Folkhalsan Institute of Genetics | Groop P.-H.,University of Helsinki | Groop P.-H.,Baker IDI Heart and Diabetes Institute | Cooper M.E.,Baker IDI Heart and Diabetes Institute | And 4 more authors.
Diabetes Care | Year: 2013

OBJECTIVE-Preclinical data suggest that linagliptin, a dipeptidyl peptidase-4 inhibitor, may lower urinary albumin excretion. The ability of linagliptin to lower albuminuria on top of reninangiotensin- aldosterone system(RAAS) inhibition in humans was analyzed by pooling data from four similarly designed, 24-week, randomized, double-blind, placebo-controlled, phase III trials. RESEARCH DESIGN AND METHODSdA pooled analysis of four completed studies identified 217 subjects with type 2 diabetes and prevalent albuminuria (defined as a urinary albumin-to-creatinine ratio [UACR] of 3023,000mg/g creatinine) while receiving stable doses of RAAS inhibitors. Participants were randomized to either linagliptin 5 mg/day (n = 162) or placebo (n = 55). The primary end point was the percentage change in geometric mean UACR from baseline to week 24. RESULTS-UACR at week 24 was reduced by 32% (95% CI 242 to 221; P < 0.05) with linagliptin compared with 6% (95% CI 227 to +23) with placebo, with a between-group difference of 28% (95% CI 247 to 22; P = 0.0357). The between-group difference in the change in HbA1c from baseline to week 24 was 20.61% (26.7 mmol/mol) in favor of linagliptin (95% CI 20.88 to 20.34% [29.6 to 23.7 mmol/mol]; P < 0.0001). The albuminuria-lowering effect of linagliptin, however, was not influenced by race or HbA1c and systolic blood pressure (SBP) values at baseline or after treatment. CONCLUSIONS-Linagliptin administered in addition to stable RAAS inhibitors led to a significant reduction in albuminuria in patients with type 2 diabetes and renal dysfunction. This observation was independent of changes in glucose level or SBP. Further research to prospectively investigate the renal effects of linagliptin is underway. © 2013 by the American Diabetes Association.

Lukashevich V.,Novartis | Schweizer A.,Novartis | Shao Q.,Novartis | Groop P.-H.,University of Helsinki | And 2 more authors.
Diabetes, Obesity and Metabolism | Year: 2011

Aim: Assess safety/tolerability and efficacy of the DPP-4 inhibitor vildagliptin in 515 patients with type 2 diabetes mellitus (T2DM) and moderate or severe renal impairment (RI). Methods: Double-blind, randomized, parallel-group, placebo-controlled, 24-week clinical trial assessing safety and efficacy of vildagliptin (50 mg qd) added to current antidiabetic therapy, in patients with T2DM and moderate or severe RI (GFR ≥ 30 to <50 or <30 ml/min/1.73 m2). Results: The study population comprised of 165 and 129 patients with moderate RI and 124 and 97 patients with severe RI randomized to vildagliptin and placebo, respectively, with most patients receiving background insulin therapy (68 and 81% for moderate and severe RI, respectively). After 24 weeks, the between-treatment difference in the adjusted mean change in A1C was -0.5 ± 0.1% (p < 0.0001) in moderate RI (baseline A1C = 7.9%) and -0.6 ± 0.1% (p < 0.0001) in severe RI (baseline A1C = 7.7%). In patients with moderate RI, similar proportions of those receiving vildagliptin or placebo experienced any AE (68 vs. 73%), any SAE (9 vs. 9%), any AE leading to discontinuation (3 vs. 5%) or death (1 vs. 1%). This was also true for patients with severe RI: AEs (73 vs. 74%), SAEs (19 vs. 21%), AEs leading to discontinuation (9 vs. 6%) and death (2 vs. 4%). Conclusions: In this 24-week study of 515 patients with T2DM and moderate or severe RI, vildagliptin added to ongoing antidiabetic therapy had a safety profile similar to placebo. Further, relative to placebo, vildagliptin elicited a statistically and clinically significant decrease in A1C in patients with moderate or severe RI. © 2011 Blackwell Publishing Ltd.

Thomas M.C.,Baker IDI Heart and Diabetes Institute | Groop P.-H.,Baker IDI Heart and Diabetes Institute | Groop P.-H.,Folkhalsan Institute of Genetics | Groop P.-H.,University of Helsinki | Tryggvason K.,Matrix
Current Opinion in Nephrology and Hypertension | Year: 2012

Purpose of review: The burden of nephropathy is unequally shared across patients with diabetes. The majority of the variability in incident nephropathy remains unaccounted for by conventional risk factors. There appears to be an inherited predisposition for diabetic nephropathy, but this does not follow simple Mendelian rules. Any inherited predisposition for nephropathy is far more complicated. This article reviews the recent advances in understanding of the genetics and epigenetics of diabetic nephropathy. Recent findings: A few candidate genes have been reproducibly associated with diabetic nephropathy, and recent genome-wide linkage studies have also identified chromosomal loci for susceptibility genes, including 3q, 7q, 10p, 14q and 18q. Unbiased, genome-wide linkage studies have identified specific loci and genome-wide association studies a number of new loci. However, any roles of those genes in the molecular pathobiology remain to be established. Moreover, their individual contribution to the variability in incident nephropathy in diabetes appears to be small. Summary: New genome-wide approaches offer new opportunities to identify genes associated with diabetic nephropathy. However, such approaches have key limitations. Upto the present time, genetic testing has failed to identify a gene or combination of genes that will substantially identify those patients most at risk for diabetic nephropathy. It may be that epigenetic regulation of gene expression may represent a more important contributor to an inherited predisposition to diabetic nephropathy. Nonetheless, genetic studies may provide valuable information regarding the pathobiology of nephropathy and potential targets for its treatment. © 2012 Wolters Kluwer Health | Lippincott Williams & Wilkins.

Unverricht-Lundborg type progressive myoclonus epilepsy (EPM1, OMIM 254800) is an autosomal recessive disorder characterized by onset at the age of 6 to 16 years, incapacitating stimulus-sensitive myoclonus and tonic-clonic epileptic seizures. It is caused by mutations in the gene encoding cystatin B. Previously, widespread white matter changes and atrophy has been detected both in adult EPM1 patients and in 6-month-old cystatin B-deficient mice, a mouse model for the EPM1 disease. In order to elucidate the spatiotemporal dynamics of the brain atrophy and white matter changes in EPM1, we conducted longitudinal in vivo magnetic resonance imaging and ex vivo diffusion tensor imaging accompanied with tract-based spatial statistics analysis to compare volumetric changes and fractional anisotropy in the brains of 1 to 6 months of age cystatin B-deficient and control mice. The results reveal progressive but non-uniform volume loss of the cystatin B-deficient mouse brains, indicating that different neuronal populations possess distinct sensitivity to the damage caused by cystatin B deficiency. The diffusion tensor imaging data reveal early and progressive white matter alterations in cystatin B-deficient mice affecting all major tracts. The results also indicate that the white matter damage in the cystatin B-deficient brain is most likely secondary to glial activation and neurodegenerative events rather than a primary result of CSTB deficiency. The data also show that diffusion tensor imaging combined with TBSS analysis provides a feasible approach not only to follow white matter damage in neurodegenerative mouse models but also to detect fractional anisotropy changes related to normal white matter maturation and reorganisation.

Pussinen P.J.,University of Helsinki | Havulinna A.S.,Finnish National Institute for Health and Welfare | Lehto M.,Folkhalsan Institute of Genetics | Lehto M.,University of Helsinki | And 2 more authors.
Diabetes Care | Year: 2011

OBJECTIVE - Diabetes is accompanied with a chronic low-grade inflammation, which may in part be mediated by endotoxins derived from Gram-negative bacteria. RESEARCH DESIGN AND METHODS - We investigated in a population-based cohort whether endotoxemia is associated with clinically incident diabetes. The serum endotoxin activity was measured by limulus assay from the FINRISK97 cohort comprising 7,169 subjects aged 25-74 years and followed up for 10 years. RESULTS - Both the subjects with prevalent diabetes (n = 537) and those with incident diabetes (n = 462) had higher endotoxin activity than the nondiabetic individuals (P < 0.001). The endotoxin activity was significantly associated with increased risk for incident diabetes with a hazard ratio 1.004 (95% CI 1.001-1.007; P = 0.019) per unit increase resulting in a 52% increased risk (P = 0.013) in the highest quartile comparedwith the lowest one. The association was independent of diabetes risk factors: serum lipids, γ-glutamyl transferase, C-reactive protein, BMI, and blood glucose. Furthermore, the association of endotoxemia with an increased risk of incident diabetes was independent of the metabolic syndrome as defined either by the National Cholesterol Educational Program-Adult Treatment Panel III or the International Diabetes Federation. Endotoxin activity was linearly related (P < 0.001) to the number of components of the metabolic syndrome. CONCLUSIONS - Both prevalent and incident diabetes were associated with endotoxemia, which may link metabolic disorders to inflammation. The results suggest that microbes play a role in the pathogenesis of diabetes. © 2011 by the American Diabetes Association.

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