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Schüler R, Osterhoff MA, Frahnow T, Spranger J, Möhlig M, Kruse M, Hornemann S, Pfeiffer AFH. Fettreiche Ernährung moduliert die Effekte einer Genvariante des Angiotensin-konvertierenden Enzyms (ACE) auf die Glukosetoleranz. DIABETOL STOFFWECHS 2016. [DOI: 10.1055/s-0036-1580775] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Döcke S, Lock JF, Birkenfeld AL, Hoppe S, Lieske S, Rieger A, Raschzok N, Sauer IM, Florian S, Osterhoff MA, Heller R, Herrmann K, Lindenmüller S, Horn P, Bauer M, Weickert MO, Neuhaus P, Stockmann M, Möhlig M, Pfeiffer AFH, von Loeffelholz C. Elevated hepatic chemerin mRNA expression in human non-alcoholic fatty liver disease. Eur J Endocrinol 2013; 169:547-57. [PMID: 23935128 DOI: 10.1530/eje-13-0112] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
OBJECTIVE Adipose tissue-derived factors link non-alcoholic fatty liver disease (NAFLD) with obesity, which has also been reported for circulating chemerin. On the other hand, hepatic chemerin and chemokine-like receptor 1 (CMKLR1) mRNA expression has not yet been studied in an extensively characterized patient collective. DESIGN This study was cross-sectional and experimental in design. METHODS Liver tissue samples were harvested from 47 subjects and histologically examined according to the NAFLD activity score (NAS). The concentrations of chemerin and CMKLR1 were measured using semi-quantitative real-time PCR, and the concentration of serum chemerin was measured using ELISA. To evaluate potential effects of chemerin and CMKLR1, cultured primary human hepatocytes (PHHs) were exposed to selected metabolites known to play a role in NAFLD (insulin, glucagon, palmitoic acid, and interleukin-6 (IL6)). RESULTS Chemerin and CMKLR1 mRNA levels were elevated in the human liver. Their expression was correlated with the NAS (R(2)=0.543; P<0.001 and R(2)=0.355; P=0.014 respectively) and was significantly elevated in patients with definite non-alcoholic steatohepatitis (NASH) (P<0.05 respectively). Linear regression analysis confirmed an independent association of liver fibrosis, steatosis, inflammation, and hepatocyte ballooning with hepatic chemerin mRNA expression (P<0.05 respectively). The expression of hepatic chemerin and CMKLR1 was correlated with the measures of obesity (P<0.05). The incubation of PHHs with IL6 significantly increased the expression of CMKLR1 mRNA (P=0.027), while that of chemerin remained unaffected (P>0.05). None of the other metabolites showed an influence (P>0.05). CONCLUSION This is the first study to show that chemerin mRNA expression is significantly elevated in the liver of NASH patients and that CMKLR1 expression is upregulated in liver inflammation, whereby IL6 could play a causal role.
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Affiliation(s)
- S Döcke
- Department of Clinical Nutrition, German Institute of Human Nutrition Potsdam-Rehbruecke, Arthur-Scheunert-Allee 114-116, 14558 Nuthetal, Germany
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Arafat AM, Weickert MO, Adamidou A, Otto B, Perschel FH, Spranger J, Möhlig M, Pfeiffer AFH. The impact of insulin-independent, glucagon-induced suppression of total ghrelin on satiety in obesity and type 1 diabetes mellitus. J Clin Endocrinol Metab 2013; 98:4133-42. [PMID: 23966238 DOI: 10.1210/jc.2013-1635] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/13/2023]
Abstract
AIMS/HYPOTHESIS The mechanisms underlying glucagon-induced satiety are incompletely understood. The glucagon-induced reduction in total ghrelin exerted at the hypothalamo-pituitary level might be responsible for this effect. Here we investigated glucagon-suppressive effects on circulating total and acyl-ghrelin, both in obesity and in type 1 diabetes mellitus (T1DM), with respect to the role of glucagon in appetite control. We further aimed to identify a possible mechanistic impact of changes in endogenous insulin. METHODS In our prospective, double-blinded, placebo-controlled study, we investigated the endocrine and metabolic responses to intramuscular glucagon administration in 13 patients with T1DM (6 males, 7 females; body mass index [BMI] 24.8 ± 0.95 kg/m(2)), 11 obese participants (OP; 5 males, 6 females; BMI 34.4 ± 1.7 kg/m(2)), and 13 healthy lean participants (LP; 6 males, 7 females; BMI 21.7 ± 0.6 kg/m(2)). RESULTS As compared with placebo, glucagon significantly increased satiety index in T1DM and in LP (P < .001) but failed to induce satiety in OP (P = .152). Total ghrelin significantly decreased after glucagon administration in all study groups (P < .01). Similarly, acyl-ghrelin significantly decreased in LP (P < .01). However, acyl-ghrelin concentrations showed no change in OP (P = .248) and even increased substantially in T1DM (P < .01). Changes in acyl-ghrelin correlated positively with changes in nonesterified fatty acid concentrations in all groups (r = 0.31-0.43; P < .01). CONCLUSIONS/INTERPRETATION Glucagon-induced satiety was preserved in T1DM but not in obesity. This effect was unrelated to changes in total or acylated ghrelin and was independent of endogenous insulin release. In contrast to the insulin-independent glucagon-induced suppression of total ghrelin, glucagon- and/or insulin-induced modification of lipolysis may determine changes in acylated ghrelin.
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Affiliation(s)
- A M Arafat
- MD, Department of Endocrinology, Diabetes, and Nutrition, Charité-University Medicine Berlin, Campus Benjamin Franklin, Hindenburgdamm 30, 12203 Berlin, Germany.
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Loeffelholz CV, Döcke S, Lock J, Hoppe S, Rieger A, Florian S, Osterhoff MA, Neuhaus P, Möhlig M, Weickert MO, Stockmann M, Pfeiffer AFH. Erhöhte hepatische Chemerin mRNA bei Patienten mit humaner nicht-alkoholischer Fettlebererkrankung. DIABETOL STOFFWECHS 2013. [DOI: 10.1055/s-0033-1347771] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Thätner C, Mai K, Bobbert T, Arafat AM, Ruhla S, Spranger J, Pfeiffer AFH, Möhlig M. In euthyroidism, moderate weight reduction by lifestyle intervention is not reducing TSH levels. Exp Clin Endocrinol Diabetes 2013. [DOI: 10.1055/s-0033-1336732] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Döcke S, Lock J, Hoppe S, Rieger A, Florian S, Osterhoff MA, Neuhaus P, Möhlig M, Weickert MO, Stockmann M, Pfeiffer AFH, Loeffelholz CV. Increased hepatic Chemerin and CMKLR1 gene expression in human nonalcoholic fatty liver disease. Exp Clin Endocrinol Diabetes 2012. [DOI: 10.1055/s-0032-1330797] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Ruhla S, Arafat A, Osterhoff M, Weickert M, Mai K, Spranger J, Schöfl C, Pfeiffer A, Möhlig M. Levothyroxine Medication is Associated with Adiposity Independent of TSH. Exp Clin Endocrinol Diabetes 2012; 120:351-4. [DOI: 10.1055/s-0032-1312599] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Affiliation(s)
- S. Ruhla
- Department of Endocrinology, Diabetes and Nutrition, Charité-University Medicine Berlin, Campus Benjamin Franklin, Berlin, Germany
| | - A. Arafat
- Department of Endocrinology, Diabetes and Nutrition, Charité-University Medicine Berlin, Campus Benjamin Franklin, Berlin, Germany
| | - M. Osterhoff
- Department of Endocrinology, Diabetes and Nutrition, Charité-University Medicine Berlin, Campus Benjamin Franklin, Berlin, Germany
| | - M. Weickert
- Department of Clinical Nutrition, German Institute of Human Nutrition Potsdam-Rehbruecke, Nuthetal, Germany
| | - K. Mai
- Department of Endocrinology, Diabetes and Nutrition, Charité-University Medicine Berlin, Campus Benjamin Franklin, Berlin, Germany
| | - J. Spranger
- Department of Endocrinology, Diabetes and Nutrition, Charité-University Medicine Berlin, Campus Benjamin Franklin, Berlin, Germany
| | - C. Schöfl
- Department of Endocrinology, Diabetes and Nutrition, Charité-University Medicine Berlin, Campus Benjamin Franklin, Berlin, Germany
| | - A.F. Pfeiffer
- Department of Endocrinology, Diabetes and Nutrition, Charité-University Medicine Berlin, Campus Benjamin Franklin, Berlin, Germany
| | - M. Möhlig
- Department of Endocrinology, Diabetes and Nutrition, Charité-University Medicine Berlin, Campus Benjamin Franklin, Berlin, Germany
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Loeffelholz CV, Lock JF, Döcke S, Möhlig M, Birkenfeld AL, Hoppe S, Bumke-Vogt C, Florian S, Rieger A, Ringe S, Isken F, Osterhoff MA, Claus RA, Bauer M, Neuhaus P, Weickert MO, Stockmann M, Pfeiffer AFH. Reduzierte AMP-aktivierte Proteinkinase (AMPK) und reduziertes Plasma Adiponektin bei humaner nicht-alkoholischer Fettlebererkrankung (NAFLD). DIABETOL STOFFWECHS 2012. [DOI: 10.1055/s-0032-1314451] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Arafat AM, Müller L, Möhlig M, Mayr B, Kremenevskaya N, Pfeiffer AFH, Buchfelder M, Schöfl C. Comparison of oral glucose tolerance test (OGTT) 100 g with OGTT 75 g for evaluation of acromegalic patients and the impact of gender on test reproducibility. Clin Endocrinol (Oxf) 2011; 75:685-91. [PMID: 21575028 DOI: 10.1111/j.1365-2265.2011.04108.x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
CONTEXT Growth hormone (GH) measurements during an oral glucose tolerance test (OGTT) are essential for the diagnosis and follow-up management of acromegaly. However, both 100 g glucose (OGTT(100) ) and 75 g glucose (OGTT(75) ) test variants are in clinical use. Whether the tests are interchangeable concerning GH nadir and test interpretation is unclear. Furthermore, information on test reproducibility and the impact of gender is scarce. OBJECTIVE To compare both tests in acromegalic patients and to evaluate test reproducibility with respect to gender. DESIGN, SUBJECTS AND METHODS OGTT(100) and OGTT(75) were performed on two consecutive days in 54 acromegalic patients (46·9 ± 1·8 years, 30 women). OGTT(75) was repeated on three different occasions in 11 healthy men and 13 healthy women at different phases of the menstrual cycle. RESULTS GH nadirs were comparable between tests [2·40 ± 0·52 (OGTT(100) ) and 2·46 ± 0·54 μg/l (OGTT(75) ); P = 0·356]. There were no differences at any time point in the mean values of GH, serum glucose or insulin between the two test variants. Test interpretation was highly consistent between the OGTT(100) and OGTT(75) [area under the receiver operated curve (ROC) = 0·995]. In men, GH, insulin and glucose measurements during OGTT(75) were highly reproducible. In women, however, basal and GH nadirs were significantly higher midcycle (P < 0·05). CONCLUSIONS In acromegalic patients, there is no difference in GH nadirs and test interpretation after the ingestion of 100 g or 75 g glucose. The OGTT(75) is highly reproducible in men, but in women, it should be performed preferably in the early follicular phase.
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Affiliation(s)
- A M Arafat
- Department of Endocrinology, Diabetes and Nutrition, Charité-University Medicine Berlin, Campus Benjamin Franklin, Berlin, Germany
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Abstract
The incidence of both type 2 diabetes and cardiac events is reported to be higher during winter, indicating a putative annual periodic change in insulin sensitivity (IS). Annual differences in IS - quantified as HOMA-%S and Matsuda-Sensitivity Index - were analyzed using a cosine wave-fitting algorithm in a cross-sectional study group including 2 385 participants. Additionally, semi-annual differences in IS were compared. We found periodicity for HOMA-%S and Matsuda-Sensitivity Index (p=0.02 or 0.006), which was strengthened after restriction to participants without diabetes (p=0.009 or 0.004). The rhythm amplitude of 0.08 indicated moderate changes in IS throughout the year. IS was significantly higher when participants were enrolled during the second vs. the first half of the year (HOMA-%S 112.0±3.0% vs. 97.4±2.4%, p<0.001). The impact of the half-year on IS, which remained significant after adjustment for confounders, was again moderate and explained only 0.5% of the variation. IS showed a significant moderate annual periodicity, which may affect the interpretation of studies reporting small changes in IS.
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Affiliation(s)
- F Isken
- Department of Clinical Nutrition, German Institute of Human Nutrition Potsdam-Rehbrücke, Nuthetal, Germany
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Isken† F, Abraham U, Weickert MO, Keyhani-Nejad F, Arafat AM, Spranger J, Pfeiffer AFH, Möhlig M. Jahreszeitliche Schwankung der Insulinsensitivität. DIABETOL STOFFWECHS 2011. [DOI: 10.1055/s-0031-1277549] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Ruhla S, Arafat AM, Weickert MO, Osterhoff M, Isken F, Spranger J, Schöfl C, Pfeiffer AFH, Möhlig M. T3/rT3-ratio is associated with insulin resistance independent of TSH. Horm Metab Res 2011; 43:130-4. [PMID: 21104580 DOI: 10.1055/s-0030-1267997] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
Thyroid dysfunction has been shown to be associated with insulin resistance (IR). This may involve peripheral thyroid hormone metabolism, which is assumed to be reflected by the ratio triiodothyronine/reverse triiodothyronine (T3/rT3-ratio). To explore a potential association between the T3/rT3-ratio and IR we investigated pairs which differed in IR, but were matched by sex, age, body mass index (BMI), and thyroid stimulating hormone (TSH). For this purpose, matched pair analyses were embedded into a cross sectional study group. 22 pairs were matched from either the first or the third tertile of HOMA%S of a cohort of 353 euthyroid subjects with normal glucose metabolism who did not take any medication. The T3/rT3-ratio was compared in the matched pairs. The T3/rT3-ratio was significantly increased in the insulin resistant subjects compared to their insulin sensitive partners (8.78 ± 0.47 vs. 7.33 ± 0.33, p=0.019). Furthermore the T3/rT3-ratio was lower in men compared to women (p for the within-subject effect=0.046) both in the insulin sensitive and the insulin resistant subjects. Here we show that the T3/rT3-ratio, which is supposed to reflect the tissue thyroid hormone metabolism, is significantly increased in insulin resistant subjects. This further supports a link between thyroid function and IR.
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Affiliation(s)
- S Ruhla
- Department of Endocrinology, Diabetes and Nutrition, Charité-University Medicine Berlin, Campus Benjamin Franklin, Berlin, Germany
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Arafat AM, Möhlig M, Weickert MO, Schöfl C, Spranger J, Pfeiffer AFH. Improved insulin sensitivity, preserved beta cell function and improved whole-body glucose metabolism after low-dose growth hormone replacement therapy in adults with severe growth hormone deficiency: a pilot study. Diabetologia 2010; 53:1304-13. [PMID: 20372873 DOI: 10.1007/s00125-010-1738-4] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/01/2009] [Accepted: 03/02/2010] [Indexed: 10/19/2022]
Abstract
AIMS/HYPOTHESIS Growth hormone-deficient patients show deterioration of insulin sensitivity and beta cell function. High-dose growth hormone treatment often induces further impairment of insulin sensitivity, leading to an increase in insulin and glucose levels or even, in cases of preexisting beta cell defect, to overt diabetes. However, low-dose treatment may improve insulin sensitivity, although data in humans with detailed metabolic phenotyping are as yet not available. We postulated that long-term low-dose growth hormone replacement, restoring IGF-1 to the low-normal range, might beneficially affect glucose metabolism. METHODS We studied prospectively the metabolic responses to 24 and 48 weeks of growth hormone treatment in a small group of six adults with severe growth hormone deficiency (four men, two women; age 40-59 years; BMI 30.2 +/- 1 kg/m(2); mean growth hormone dose 0.3 +/- 0.04 mg/day). All participants underwent an oral glucose tolerance test, euglycaemic-hyperinsulinaemic clamp and hyperglycaemic-hyperinsulinaemic clamp plus i.v. L: -arginine on three occasions. Insulin sensitivity was measured by calculating the M value during the steady state of the euglycaemic-hyperinsulinaemic clamp. Insulin secretion and clearance were estimated from AUC(C-peptide), AUC(insulin) and their ratio at each phase of the hyperglycaemic-hyperinsulinaemic clamp. RESULTS Growth hormone significantly improved insulin sensitivity (M value 13.8 +/- 2.6 [baseline] vs 19.6 +/- 2.6 [24 weeks] and 23.7 +/- 1.9 [48 weeks] micromol kg(-1) min(-1); p < 0.01). Although the insulin response to glucose and arginine decreased slightly, the disposition index, integrating insulin sensitivity and secretion, significantly increased (p < 0.01), indicating an improvement in whole-body glucose metabolism. Insulin clearance was not affected during treatment (p > 0.05). CONCLUSIONS/INTERPRETATION Our data indicate that long-term low-dose growth hormone treatment may improve insulin sensitivity and whole-body glucose metabolism in adults with severe growth hormone-deficiency.
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Affiliation(s)
- A M Arafat
- Department of Endocrinology, Diabetes and Nutrition, Charité-University Medicine Berlin, Campus Benjamin Franklin, Hindenburgdamm 30, 12200, Berlin, Germany.
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Mai K, Bobbert T, Andres J, Assmann A, Reinecke F, Möhlig M, Pfeiffer A, Spranger J. Modulation of circulating human Alpha-2-HS-glycoprotein by FFAs. DIABETOL STOFFWECHS 2010. [DOI: 10.1055/s-0030-1253783] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Möhlig M, Arafat AM, Ruhla S, Pfeiffer AFH, Schöfl C. TSH ist bei euthyreoten Frauen mit polyzystischem Ovarsyndrom (PCOS) mit dem Body-Mass-Index (BMI) assoziiert. DIABETOL STOFFWECHS 2010. [DOI: 10.1055/s-0030-1253956] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Möhlig M, Öztürk C, Osterhoff M, Arafat AM, Ruhla S, Isken F, Spranger J, Pfeiffer AFH. Fernsehzeit und Kohlenhydrataufnahme sind assoziiert mit dem Body-Mass-Index (BMI). DIABETOL STOFFWECHS 2010. [DOI: 10.1055/s-0030-1253953] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Isken F, Weickert MO, Tschöp MH, Nogueiras R, Möhlig M, Abdelrahman A, Klaus S, Thorens B, Pfeiffer AF. Metabolic effects of diets differing in glycaemic index depend on age and endogenous glucose-dependent insulinotrophic polypeptide in mice. Diabetologia 2009; 52:2159-68. [PMID: 19644669 DOI: 10.1007/s00125-009-1466-9] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/06/2009] [Accepted: 06/24/2009] [Indexed: 12/22/2022]
Abstract
AIMS/HYPOTHESIS High- vs low-glycaemic index (GI) diets unfavourably affect body fat mass and metabolic markers in rodents. Different effects of these diets could be age-dependent, as well as mediated, in part, by carbohydrate-induced stimulation of glucose-dependent insulinotrophic polypeptide (GIP) signalling. METHODS Young-adult (16 weeks) and aged (44 weeks) male wild-type (C57BL/6J) and GIP-receptor knockout (Gipr ( -/- )) mice were exposed to otherwise identical high-carbohydrate diets differing only in GI (20-26 weeks of intervention, n = 8-10 per group). Diet-induced changes in body fat distribution, liver fat, locomotor activity, markers of insulin sensitivity and substrate oxidation were investigated, as well as changes in the gene expression of anorexigenic and orexigenic hypothalamic factors related to food intake. RESULTS Body weight significantly increased in young-adult high- vs low-GI fed mice (two-way ANOVA, p < 0.001), regardless of the Gipr genotype. The high-GI diet in young-adult mice also led to significantly increased fat mass and changes in metabolic markers that indicate reduced insulin sensitivity. Even though body fat mass also slightly increased in high- vs low-GI fed aged wild-type mice (p < 0.05), there were no significant changes in body weight and estimated insulin sensitivity in these animals. However, aged Gipr ( -/- ) vs wild-type mice on high-GI diet showed significantly lower cumulative net energy intake, increased locomotor activity and improved markers of insulin sensitivity. CONCLUSIONS/INTERPRETATION The metabolic benefits of a low-GI diet appear to be more pronounced in younger animals, regardless of the Gipr genotype. Inactivation of GIP signalling in aged animals on a high-GI diet, however, could be beneficial.
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Affiliation(s)
- F Isken
- Department of Clinical Nutrition, German Institute of Human Nutrition, Potsdam-Rehbruecke, Germany
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Möhlig M, Mayer P, Horn PA, Schatz H, Pfeiffer A. Overexpression of calcium/calmodulin-dependent protein kinase II in insulinoma cells by use of a retroviral vector. Exp Clin Endocrinol Diabetes 2009; 103 Suppl 2:71-3. [PMID: 8839257 DOI: 10.1055/s-0029-1211397] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
The manner in which increasing intracellular calcium levels lead to insulin exocytosis is not known. Possibly the signal is mediated by activation of calcium/calmodulin-dependent protein kinase II (CaM Kin II). In this work the establishment of an insulinoma cell line stably overexpressing CaM Kinase II subtype delta 2 by an ecotropic retroviral transduction system is described.
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Affiliation(s)
- M Möhlig
- Medizinische Klinik und Poliklinik, Berufsgenossenschaftliche Krankenanstalten Bergmannsheil, Ruhr-Universität, Bochum, Germany
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Sabath M, Bähr V, Andres J, Arafat AM, Weickert MO, Spranger J, Pfeiffer AFH, Möhlig M. Effekt der Acetylsalicylsäure auf die Lipid-induzierte Insulinresistenz abhängig von der eingesetzten Fettsäure. DIABETOL STOFFWECHS 2009. [DOI: 10.1055/s-0029-1222053] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Mai K, Andres J, Weicht J, Meinus S, Bobbert T, Reinecke F, Möhlig M, Weickert M, Pfeiffer A, Spranger J. The metabolic regulator FGF-21 is induced by free fatty acids but not by PPARχ stimulation in man: Results of two randomized, controlled trials. DIABETOL STOFFWECHS 2009. [DOI: 10.1055/s-0029-1221953] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Weicht J, Mai K, Arafat AM, Bobbert T, Ruhla S, Weickert MO, Spranger J, Pfeiffer AFH, Möhlig M. Akute Effekte auf die Subendokardiale Viability Ratio während Lipid-induzierter Insulinresistenz. DIABETOL STOFFWECHS 2009. [DOI: 10.1055/s-0029-1222069] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Arafat AM, Möhlig M, Weickert MO, Perschel FH, Purschwitz J, Spranger J, Strasburger CJ, Schöfl C, Pfeiffer AFH. A comparison between three automated chemiluminescence assays for growth hormone: on the use of recombinant hGH as a primary calibrant. Exp Clin Endocrinol Diabetes 2008. [DOI: 10.1055/s-0028-1096361] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Mai K, Bobbert T, Reinecke F, Andres J, Maser-Gluth C, Wudy SA, Möhlig M, Weickert MO, Hartmann MF, Schulte HM, Diederich S, Pfeiffer AFH, Spranger J. Intravenous lipid and heparin infusion-induced elevation in free fatty acids and triglycerides modifies circulating androgen levels in women: a randomized, controlled trial. J Clin Endocrinol Metab 2008; 93:3900-6. [PMID: 18664538 DOI: 10.1210/jc.2008-0714] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
BACKGROUND The polycystic ovarian syndrome (PCOS) is characterized by hyperandrogenism and associated with obesity and impaired glucose metabolism. Despite the high prevalence of PCOS and the considerable clinical impact, the precise interplay between metabolism and hyperandrogenemia is not entirely clear. OBJECTIVE The objective of the study was to analyze the effects of iv lipid and heparin infusion on circulating androgen levels in healthy women. DESIGN This was a randomized, controlled, crossover trial. SETTING The study was conducted at an endocrinology center. PATIENTS Patients included 12 healthy young women during the early follicular phase of two subsequent cycles. INTERVENTION After an overnight fast, a 20% lipid/heparin or a saline/heparin infusion was administered in random order for 330 min. MAIN OUTCOME MEASURES A detailed characterization of androgen metabolism was performed. RESULTS Elevations in free fatty acids and triglycerides, induced by lipid/heparin infusion, elevates the levels of androstenedione, dehydroepiandrosterone (DHEA), dehydroepiandrosterone sulfate (DHEAS), testosterone, 5alpha-dihydrotestosterone, estrone, and 17beta-estradiol. Urinary excretion of DHEA, DHEAS, 5-androstene-3beta,17beta-diol, and the sum of urinary excreted DHEA and its 16-hydroxylated downstream metabolites, 16alpha-hydroxy-DHEA and 5-androstene-3beta,16alpha,17beta-triol, were reduced. CONCLUSION The mechanism of iv lipid and heparin infusion-induced elevation of circulating androgens described here might contribute to the development of hyperandrogenism in women with PCOS and suggests that lowering of hyperlipidemia might be a potential therapeutic target in patients with PCOS to treat hyperandrogenemia.
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Affiliation(s)
- K Mai
- Department of Endocrinology, Diabetes, and Nutrition, Charité-Universitätsmedizin Berlin, Hindenburgdamm 30, 12200 Berlin, Germany
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Opgen-Rhein C, Sahin I, Möhlig M, Wetter T, Dettling M. Metabolic changes in patients undergoing treatment with atypical antipsychotics – a prospective investigation. Exp Clin Endocrinol Diabetes 2008. [DOI: 10.1055/s-0028-1096336] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Arafat AM, Adamidou A, Otto B, Weickert MO, Perschel FH, Spranger J, Schöfl C, Möhlig M, Pfeiffer AFH. Glucagon suppression of total but not of acylated ghrelin is preserved in obesity; the impact on appetite control. Exp Clin Endocrinol Diabetes 2008. [DOI: 10.1055/s-0028-1096335] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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26
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Weickert MO, Möhlig M, Spranger J, Schöfl C, Loeffelholz CV, Riepl RL, Otto B, Pfeiffer AFH. Effects of euglycemic hyperinsulinemia and lipid infusion on circulating cholecystokinin. J Clin Endocrinol Metab 2008; 93:2328-33. [PMID: 18364380 DOI: 10.1210/jc.2007-2787] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
AIMS Functions of the gut hormone cholecystokinin (CCK) include an important role in the regulation of gastric emptying, postprandial glucose homeostasis, and postmeal satiety. Postprandial CCK responses are significantly blunted in type 2 diabetic patients by unknown mechanisms. We hypothesized that hyperinsulinemia and lipid infusion influence circulating levels of biologically active CCK. METHODS Eleven healthy subjects were studied in a cross-over design after 10-h overnight fasts, using euglycemic-hyperinsulinemic clamps for 443 min, with an additional infusion of lipid-heparin (1.25 ml.min(-1)) or saline (1.25 ml.min(-1)) for the last 300 min after constant plasma glucose levels were achieved. RESULTS Euglycemic-hyperinsulinemia resulted in a sustained, up to 5-fold increase of plasma CCK (P < 0.001). When adding lipid infusion instead of saline, CCK concentrations rapidly declined and returned to baseline levels (CCK(300 min) 1.1 +/- 0.2 vs. 3.3 +/- 0.3 pmol/liter, P < 0.001). Partial intraclass correlation showed an independent correlation of plasma CCK with free fatty acids (r(ic) = -0.377, P < 0.001) but not with serum insulin (r(ic) = 0.077, P = 0.32). Whole-body insulin sensitivity decreased in lipid-exposed subjects (M value 7.1 +/- 0.7 vs. 5.6 +/- 0.9 mg.kg.min(-1), P = 0.017) but was not independently correlated with CCK (r(ic) = 0.040, P = 0.61). CONCLUSIONS We report novel findings showing that circulating CCK markedly increased in the euglycemic-hyperinsulinemic state, possibly as a result of near-complete suppression of circulating free fatty acids. Moreover, raising blood lipids even moderately by lipid infusion rapidly and significantly interfered with this effect, suggesting that a negative feedback mechanism of blood lipids on circulating CCK might exist.
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Affiliation(s)
- M O Weickert
- Department of Endocrinology, Diabetes, and Nutrition, Charité-University-Medicine, Campus Benjamin Franklin, Free University of Berlin, Berlin, Germany.
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Weickert MO, Loeffelholz CV, Arafat AM, Schöfl C, Otto B, Spranger J, Möhlig M, Pfeiffer AF. Euglycemic hyperinsulinemia differentially modulates circulating total and acylated-ghrelin in humans. J Endocrinol Invest 2008; 31:119-24. [PMID: 18362502 DOI: 10.1007/bf03345577] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Ghrelin is a powerful orexigenic gut hormone. Circulating concentrations of total ghrelin are downregulated by food intake in both acute and chronic hyperinsulinemic states. However, in blood des-acylated (des-acyl) ghrelin is the predominant form that has no orexigenic effects in humans. Circulating acyl-ghrelin has been shown to be suppressed post-prandially and by pharmacological hyperinsulinemia. However, up to now responses of circulating acyl-ghrelin to moderate hyperinsulinemic and hyperinsulinemic-hyperlipidemic clamp conditions have not been reported. Fourteen healthy subjects were investigated using two-stepped euglycemic-hyperinsulinemic clamps (40 mU insulin/ m2/min; mean 148+/-7 min till steady state, followed by 300 min lipid/heparin infusion). Responses of total ghrelin and acyl-ghrelin were measured at timed intervals throughout the clamps. Des-acyl-ghrelin concentrations were calculated by subtraction. Total ghrelin significantly decreased vs baseline concentrations (819+/-92 vs 564+/-58 pg/ml, p<0.001), thereby confirming previous observations. Des-acyl ghrelin closely followed total ghrelin concentrations and significantly decreased vs baseline (772+/-92 vs 517+/-56 pg/ml, p<0.001). In contrast, neither euglycemichyperinsulinemia nor euglycemic-hyperinsulinemic- hyperlipidemia suppressed acyl-ghrelin below baseline concentrations throughout the clamps (46+/-3 vs 47+/-8 pg/ml, p=0.90). In conclusion, moderate hyperinsulinemic and hyperinsulinemic- hyperlipidemic clamp conditions differentially modulated circulating total ghrelin and acylghrelin in humans. Factors other than changes in insulin and lipid concentrations are likely to contribute to the previously reported post-prandial reduction of circulating acyl-ghrelin.
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Affiliation(s)
- M O Weickert
- Department of Clinical Nutrition, German Institute of Human Nutrition Potsdam-Rehbruecke, Nuthetal, Germany.
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Fischer A, Weickert MO, Osterhoff M, Möhlig M, Pfeiffer AFH, Boeing H, Spranger J. Der Effekt des rs10882278 Polymorphismus des RBP4-Gens auf anthropometrische Parameter, Indizes des Glucosestoffwechsels und kardiovaskuläre Endpunkte in zwei unabhängigen Kohorten. DIABETOL STOFFWECHS 2008. [DOI: 10.1055/s-2008-1076329] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Huth C, Illig T, Herder C, Gieger C, Grallert H, Vollmert C, Rathmann W, Martin S, Hamid YH, Pedersen O, Hansen T, Thorand B, Meisinger C, Döring A, Klopp N, Gohlke H, Langer B, Lieb W, Hengstenberg C, Lyssenko V, Groop L, Irland H, Stephens JW, Wernstedt I, Niklason A, Jansson JO, Boeing H, Möhlig M, Spranger J, Pfeiffer AFH, Stringham HM, Boehnke M, Tuomilehto J, Fernandez-Real JM, Lopez-Bermejo A, Gallart L, Vendrell J, Tsiavou A, Hatziagelaki E, Hanson RL, Wolford JK, Humphries SE, Kronenberg F, Wichmann HE, Heid IM. Assoziation zwischen IL6–174G>C und Diabetes mellitus Typ 2 sowie quantitativen Nüchternglucosespiegeln – Eine Individualdatenanalyse 21 internationaler Studien. DIABETOL STOFFWECHS 2008. [DOI: 10.1055/s-2008-1076379] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Ruhla S, Spranger J, Weickert MO, Arafat AM, Schöfl C, Pfeiffer AFH, Möhlig M. Schilddrüsenhormonlage und Insulinempfindlichkeit: Höherer T3/rT3-Quotient bei Insulinresistenz. DIABETOL STOFFWECHS 2008. [DOI: 10.1055/s-2008-1076448] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Raila J, Henze A, Spranger J, Möhlig M, Pfeiffer AFH, Schweigert FJ. Microalbuminuria is a major determinant of elevated plasma retinol-binding protein 4 in type 2 diabetic patients. Kidney Int 2007; 72:505-11. [PMID: 17568782 DOI: 10.1038/sj.ki.5002372] [Citation(s) in RCA: 74] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Plasma retinol-binding protein 4 (RBP4) may be a new adipokine linked to obesity-induced insulin resistance and type 2 diabetes. The impact of diabetic nephropathy on plasma RBP4 levels, however, is not known. We tested the hypothesis that microalbuminuria is associated with elevated plasma concentrations of RBP4 in type 2 diabetic subjects. Retinol, its binding protein and transthyretin (TTR) were measured in the plasma and urine of 62 type 2 diabetic subjects, 26 of whom had microalbuminuria. The results were compared to 35 healthy control subjects. Despite no differences in plasma retinol, concentrations of the RBP4 were significantly elevated in plasma of diabetic patients and significantly higher in those with microalbuminuria. The higher plasma levels of the binding protein in subjects with microalbuminuria were accompanied by both significantly elevated plasma TTR and increased urinary levels of RBP4. There were no correlations of plasma-binding protein levels and parameters of insulin resistance. Our study suggests that plasma RBP4 levels in type 2 diabetic patients are affected by incipient nephropathy. Therefore, further studies evaluating RBP4 as a regulator of systemic insulin resistance and type 2 diabetes will need to take renal function into consideration.
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Affiliation(s)
- J Raila
- Institute of Nutritional Science, University of Potsdam, Potsdam, Germany.
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Arafat AM, Frystyk J, Weickert MO, Spranger J, Schöfl C, Möhlig M, Pfeiffer AFH. Insulin decreases IGF-I bioactivity in patients with impaired glucose tolerance and in healthy subjects. Exp Clin Endocrinol Diabetes 2007. [DOI: 10.1055/s-2007-972399] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Fischer A, Möhlig M, Osterhoff M, Weickert MO, Pfeifer AFH, Spranger J. The KCNJ11 E23K polymorphism is associated with impaired glucose metabolism and affects the disposition index. Exp Clin Endocrinol Diabetes 2007. [DOI: 10.1055/s-2007-972436] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Möhlig M, Weickert MO, Arafat AM, Spranger J, Pfeiffer AFH, Schöfl C. Case report: Bilateral adrenal macronodular hyperplasia. Exp Clin Endocrinol Diabetes 2007. [DOI: 10.1055/s-2007-972239] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Weickert MO, Löffelholz CV, Roden M, Chandramouli V, Brehm A, Nowotny P, Osterhoff MA, Isken F, Spranger J, Landau BR, Pfeiffer AFH, Möhlig M. A common Thr94Ala replacement in liver-fatty-acid-binding-protein contributes to improved glucose metabolism upon lipid challenge. Exp Clin Endocrinol Diabetes 2007. [DOI: 10.1055/s-2007-972374] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Weickert MO, Schöfl-Siegert B, Möhlig M, Schöfl C. Isolated ACTH deficiency in adult age – presentation of four new cases. Exp Clin Endocrinol Diabetes 2007. [DOI: 10.1055/s-2007-972349] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Möhlig M, Spranger J, Weickert MO, Arafat AM, Pfeiffer AFH, Schöfl C. The impact of testosterone and the androgen receptor (AR) CAG length polymorphism on insulin resistance in men. Exp Clin Endocrinol Diabetes 2007. [DOI: 10.1055/s-2007-972381] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Arafat AM, Möhlig M, Weickert MO, Perschel FH, Purschwitz J, Spranger J, Strasburger C, Schöfl C, Pfeiffer AFH. Growth hormone response during OGTT: The impact of assay method, gender and BMI on the estimation of reference values in patients with acromegaly and in healthy controls. Exp Clin Endocrinol Diabetes 2007. [DOI: 10.1055/s-2007-972337] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Möhlig M, Ghadamgahi E, Weickert MO, Arafat AM, Spranger J, Pfeiffer AFH, Schöfl C. FABP-A correlates with body fat mass in PCOS women. Exp Clin Endocrinol Diabetes 2007. [DOI: 10.1055/s-2007-972314] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Möhlig M, Lenhard F, Lutz PFX, Weickert MO, Arafat AM, Osterhoff M, Spranger J, Pfeiffer AFH. Der DGAT C79T Polymorphismus ist in einer deutschen Kohorte nicht assoziiert mit Übergewicht. DIABETOL STOFFWECHS 2007. [DOI: 10.1055/s-2007-982401] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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41
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Fischer A, Andres J, Möhlig M, Osterhoff M, Pfeiffer AFH, Spranger J. Einfluss zweier Promotorpolymorphismen im 11beta-HSD1-Gen auf Parameter des Glukosestoffwechsels. DIABETOL STOFFWECHS 2007. [DOI: 10.1055/s-2007-982411] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Weickert MO, von Löffelholz C, Arafat AM, Schöfl C, Otto B, Möhlig M, Pfeiffer AFH. Hyperinsulinämische und hyperinsulinämisch-hyperlipidämische Bedingungen supprimieren Gesamt-Ghrelin, aber nicht orexigen aktives Acyl-Ghrelin bei gesunden normalgewichtigen Personen. DIABETOL STOFFWECHS 2007. [DOI: 10.1055/s-2007-982383] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Möhlig M, Weickert MO, Ghadamgahi E, Arafat AM, Pfeiffer AFH, Schöfl C. A-FABP hat keinen größeren Einfluss auf Insulinresistenz, subklinische Entzündung oder Hyperandrogenismus bei Frauen mit PCO-Syndrom. DIABETOL STOFFWECHS 2007. [DOI: 10.1055/s-2007-982402] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Möhlig M, Spranger J, Weickert MO, Arafat AM, Osterhoff M, Schöfl C, Pfeiffer AFH. Nüchternglukose ist geeignet für das Diabetes-Screening in Deutschland- bei erhöhten Werten erlaubt der HbA1c eine weitere Diskriminierung. DIABETOL STOFFWECHS 2007. [DOI: 10.1055/s-2007-982246] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Bobbert T, Wegewitz U, Brechtel L, Freudenberg M, Mai K, Möhlig M, Diederich S, Ristow M, Rochlitz H, Pfeiffer AFH, Spranger J. Adiponectin oligomers in human serum during acute and chronic exercise: relation to lipid metabolism and insulin sensitivity. Int J Sports Med 2006; 28:1-8. [PMID: 17133288 DOI: 10.1055/s-2006-924028] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
Beneficial effects of physical exercise include improved insulin sensitivity, which may be affected by a modulated release of adiponectin, which is exclusively synthesized in white adipose tissue and mediates insulin sensitivity. Adiponectin circulates in three different oligomers, which also have a distinct biological function. We therefore aimed to investigate the distribution of adiponectin oligomers in human serum in relation to physical activity. Thirty-eight lean and healthy individuals were investigated. Seven healthy women and 8 healthy men volunteered to investigate the effect of chronic exercise, at 3 different time points with different training intensities. These individuals were all highly trained and were compared to a control group with low physical activity (n = 15). For studying acute exercise effects, 8 healthy men participated in a bicycle test. Adiponectin was determined by ELISA, oligomers were detected by non-denaturating western blot. Total adiponectin and oligomers were unchanged by acute exercise. LDL cholesterol was significantly lower in the chronic exercise group (p = 0.03). Total adiponectin levels and oligomers were not different between these two groups and were unaltered by different training intensities. However, total adiponectin and specifically HMW oligomers correlated with HDL cholesterol (r = 0.459; p = 0.009). We conclude that acute and chronic exercise does not directly affect circulating adiponectin or oligomer distribution in lean and healthy individuals. Whether such regulation is relevant in individuals with a metabolic disorder remains to be determined. However, our data suggest that adiponectin oligomers have distinct physiological functions IN VIVO, and specifically HMW adiponectin is closely correlated with HDL cholesterol.
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Affiliation(s)
- T Bobbert
- Department of Clinical Nutrition, German Institute of Human Nutrition Potsdam, Nuthetal, Germany
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Möhlig M, Flöter A, Spranger J, Weickert MO, Schill T, Schlösser HW, Brabant G, Pfeiffer AFH, Selbig J, Schöfl C. Predicting impaired glucose metabolism in women with polycystic ovary syndrome by decision tree modelling. Diabetologia 2006; 49:2572-9. [PMID: 16972044 DOI: 10.1007/s00125-006-0395-0] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/06/2006] [Accepted: 07/06/2006] [Indexed: 12/15/2022]
Abstract
AIMS/HYPOTHESIS Polycystic ovary syndrome (PCOS) is a risk factor of type 2 diabetes. Screening for impaired glucose metabolism (IGM) with an OGTT has been recommended, but this is relatively time-consuming and inconvenient. Thus, a strategy that could minimise the need for an OGTT would be beneficial. MATERIALS AND METHODS Consecutive PCOS patients (n=118) with fasting glucose <6.1 mmol/l were included in the study. Parameters derived from medical history, clinical examination and fasting blood samples were assessed by decision tree modelling for their ability to discriminate women with IGM (2-h OGTT value >/=7.8 mmol/l) from those with NGT. RESULTS According to the OGTT results, 93 PCOS women had NGT and 25 had IGM. The best decision tree consisted of HOMA-IR, the proinsulin:insulin ratio, proinsulin, 17-OH progesterone and the ratio of luteinising hormone:follicle-stimulating hormone. This tree identified 69 women with NGT. The remaining 49 women included all women with IGM (100% sensitivity, 74% specificity to detect IGM). Pruning this tree to three levels still identified 53 women with NGT (100% sensitivity, 57% specificity to detect IGM). Restricting the data matrix used for tree modelling to medical history and clinical parameters produced a tree using BMI, waist circumference and WHR. Pruning this tree to two levels separated 27 women with NGT (100% sensitivity, 29% specificity to detect IGM). The validity of both trees was tested by a leave-10%-out cross-validation. CONCLUSIONS/INTERPRETATION Decision trees are useful tools for separating PCOS women with NGT from those with IGM. They can be used for stratifying the metabolic screening of PCOS women, whereby the number of OGTTs can be markedly reduced.
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Affiliation(s)
- M Möhlig
- Department of Clinical Nutrition, German Institute of Human Nutrition Potsdam-Rehbruecke, 14558 Nuthetal, Germany.
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Garcia AL, Otto B, Reich SC, Weickert MO, Steiniger J, Machowetz A, Rudovich NN, Möhlig M, Katz N, Speth M, Meuser F, Doerfer J, Zunft HJF, Pfeiffer AHF, Koebnick C. Arabinoxylan consumption decreases postprandial serum glucose, serum insulin and plasma total ghrelin response in subjects with impaired glucose tolerance. Eur J Clin Nutr 2006; 61:334-41. [PMID: 16988651 DOI: 10.1038/sj.ejcn.1602525] [Citation(s) in RCA: 137] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
OBJECTIVE Arabinoxylan (AX) consumption is associated with metabolic improvement during diabetes and with modulation of ghrelin, an orexigenic gut hormone. The effect of AX consumption on ghrelin secretion in disturbed metabolic states is unknown. Therefore, we investigated the postprandial responses to AX consumption of serum glucose, insulin and triglycerides and plasma total and acylated ghrelin in subjects with impaired glucose tolerance (IGT). DESIGN Randomized, single-blind, controlled, crossover intervention trial. SUBJECTS Seven female and four male adults with IGT, aged 55.5 years, and body mass index (BMI) 30.1 kg/m(2). INTERVENTION Subjects received either placebo or 15 g AX supplement for 6 weeks with a 6-week washout period in-between. MAIN OUTCOME MEASUREMENTS Postprandial responses of serum glucose, insulin and triglycerides, and plasma total and acylated ghrelin after a liquid meal challenge test (LMCT) measured at the beginning and at the end of the dietary intervention at -20, -5, 0, 15, 30, 45, 60, 90, 120, 150, 180, 210 and 240 min. RESULTS After LMCT, AX consumption resulted in lower postprandial responses in serum glucose, insulin and triglycerides (P<0.05). Compared to placebo, total plasma ghrelin was also reduced by 42+/-8 pg/ml (P<0.001) after AX consumption with no difference in plasma acylated ghrelin. CONCLUSION AX consumption improved postprandial metabolic responses after an LMCT in subjects with IGT and reduced total ghrelin response. However, acylated ghrelin responses were unchanged, suggesting that the acylated ghrelin-mediated orexigenic regulation is not improved as only total plasma ghrelin decreased.
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Affiliation(s)
- A L Garcia
- Dietary Fibre and the Metabolic Syndrome Group, German Institute of Human Nutrition, Potsdam-Rehbruecke, Nuthetal, Germany
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Arafat AM, Perschel FH, Otto B, Weickert MO, Rochlitz H, Schöfl C, Spranger J, Möhlig M, Pfeiffer AFH. Glucagon suppression of ghrelin secretion is exerted at hypothalamus-pituitary level. J Clin Endocrinol Metab 2006; 91:3528-33. [PMID: 16787987 DOI: 10.1210/jc.2006-0225] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/12/2023]
Abstract
CONTEXT The mechanisms underlying the well-known glucagon-induced satiety effect are unclear. Recently, we showed that glucagon induces a remarkable decrease in the orexigenic hormone ghrelin that might be responsible for this effect. OBJECTIVE The objective of this study was to evaluate the putative role of the hypothalamic pituitary axis in glucagon's suppressive effect on ghrelin secretion. DESIGN, SUBJECTS, AND METHODS: Prospectively, we studied the endocrine and metabolic responses to im glucagon administration in 22 patients (16 males; age, 21-68 yr; body mass index, 28.1 +/- 1.1 kg/m(2)) with a known hypothalamic-pituitary lesion and at least one pituitary hormone deficiency. Control experiments were performed in 27 healthy subjects (15 males; age, 19-65 yr; body mass index, 25.5 +/- 0.9 kg/m(2)). RESULTS The suppression of ghrelin by glucagon measured as area under the curve(240 min) was significantly greater in controls when compared with patients (P < 0.01). Although there was a significant decrease in ghrelin in controls (P < 0.001), ghrelin was almost unchanged in patients (P = 0.359). Changes in glucagon, glucose, and insulin levels were comparable between both groups. CONCLUSIONS We show that the hypothalamic-pituitary axis plays an essential role in the suppression of ghrelin induced by im glucagon administration. Glucagon significantly decreases ghrelin levels in healthy subjects. However, in the absence of an intact hypothalamic-pituitary axis, this effect was abolished. The mechanisms responsible for our observation are unlikely to include changes in glucose or insulin levels.
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Affiliation(s)
- A M Arafat
- Department of Endocrinology, Diabetes, and Nutrition, Charité-University Medicine Berlin, Campus Benjamin Franklin, Hindenburgdamm 30, 12200 Berlin, Germany.
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Affiliation(s)
- F Isken
- Department of Clinical Nutrition, German Institute of Human Nutrition Potsdam-Rehbrücke, Nuthetal, Germany
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Fisher E, Li Y, Burwinkel B, Kühr V, Hoffmann K, Möhlig M, Spranger J, Pfeiffer A, Boeing H, Schrezenmeir J, Döring F. Preliminary evidence of FABP2 A54T polymorphism associated with reduced risk of type 2 diabetes and obesity in women from a German cohort. Horm Metab Res 2006; 38:341-5. [PMID: 16718632 DOI: 10.1055/s-2006-925400] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
The T54 variant of the FABP2 gene has shown an association with the insulin resistance syndrome in some, but not all, studies. Here, we tested the hypothesis that the association between FABP2 A54T genotype and type 2 diabetes (T2DM) is confounded by body mass index (BMI) and is different between the two genders. 192 incident cases of T2DM and 384 sex- and age-matched controls were taken from the EPIC-Potsdam study cohort. Logistic regression analyses revealed that BMI was a strong confounder for diabetes risk association among women. When adjusted for BMI, the homozygous T54 variant was significantly associated with reduced risk of T2DM in women (OR = 0.24, 95 %CI: 0.07 - 0.82), but not in men in the co-dominant inheritance model. Accordingly, HbA (1c) values were significantly lower in women carrying two T54 alleles with BMI regarded as covariate. While accounting for potentially confounding effects, linear trends of increased BMI and leptin values were observed in women according to the presence of T54 alleles. The interaction term (p = 0.04) of continuous BMI and T54-coding genotypes suggested that the T54 variant is an effect-modifier for BMI in females. We conclude that the T54 allele of FABP2 A54T is associated both with higher BMI and reduced risk of T2DM in women from the German EPIC-Potsdam study.
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Affiliation(s)
- E Fisher
- Department of Epidemiology, German Institute of Human Nutrition Potsdam-Rehbruecke, Nuthetal, Germany.
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