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Sun C, Holstein DJF, Garcia-Cubero N, Moulla Y, Stroh C, Dietrich A, Schön MR, Gärtner D, Lohmann T, Dressler M, Stumvoll M, Blüher M, Kovacs P, Guiu-Jurado E. The Role of Phosphatidylethanolamine N-Methyltransferase ( PEMT) and Its Waist-Hip-Ratio-Associated Locus rs4646404 in Obesity-Related Metabolic Traits and Liver Disease. Int J Mol Sci 2023; 24:16850. [PMID: 38069170 PMCID: PMC10706059 DOI: 10.3390/ijms242316850] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2023] [Revised: 11/21/2023] [Accepted: 11/24/2023] [Indexed: 12/18/2023] Open
Abstract
In previous genome-wide association studies (GWAS), genetic loci associated with obesity and impaired fat distribution (FD) have been identified. In the present study, we elucidated the role of the PEMT gene, including the waist-hip-ratio-associated single nucleotide polymorphism rs4646404, and its influence on obesity-related metabolic traits. DNA from 2926 metabolically well-characterized subjects was used for genotyping. PEMT expression was analyzed in paired visceral (vis) and subcutaneous (sc) adipose tissue (AT) from a subset of 574 individuals. Additionally, PEMT expression was examined in vis, sc AT and liver tissue in a separate cohort of 64 patients with morbid obesity and liver disease. An in vitro Pemt knockdown was conducted in murine epididymal and inguinal adipocytes. Our findings highlight tissue-specific variations in PEMT mRNA expression across the three studied tissues. Specifically, vis PEMT mRNA levels correlated significantly with T2D and were implicated in the progression of non-alcoholic steatohepatitis (NASH), in contrast to liver tissue, where no significant associations were found. Moreover, sc PEMT expression showed significant correlations with several anthropometric- and metabolic-related parameters. The rs4646404 was associated with vis AT PEMT expression and also with diabetes-related traits. Our in vitro experiments supported the influence of PEMT on adipogenesis, emphasizing its role in AT biology. In summary, our data suggest that PEMT plays a role in regulating FD and has implications in metabolic diseases.
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Affiliation(s)
- Chang Sun
- Medical Department III—Endocrinology, Nephrology, Rheumatology, University of Leipzig Medical Center, 04103 Leipzig, Germany
| | - David J. F. Holstein
- Medical Department III—Endocrinology, Nephrology, Rheumatology, University of Leipzig Medical Center, 04103 Leipzig, Germany
| | - Natalia Garcia-Cubero
- Medical Department III—Endocrinology, Nephrology, Rheumatology, University of Leipzig Medical Center, 04103 Leipzig, Germany
| | - Yusef Moulla
- Clinic for Visceral, Transplantation and Thorax and Vascular Surgery, University Hospital Leipzig, 04103 Leipzig, Germany
| | - Christine Stroh
- Department of General, Abdominal and Pediatric Surgery, Municipal Hospital, 07548 Gera, Germany
| | - Arne Dietrich
- Clinic for Visceral, Transplantation and Thorax and Vascular Surgery, University Hospital Leipzig, 04103 Leipzig, Germany
| | - Michael R. Schön
- Städtisches Klinikum Karlsruhe, Clinic of Visceral Surgery, 76133 Karlsruhe, Germany
| | - Daniel Gärtner
- Städtisches Klinikum Karlsruhe, Clinic of Visceral Surgery, 76133 Karlsruhe, Germany
| | - Tobias Lohmann
- Municipal Clinic Dresden-Neustadt, 01129 Dresden, Germany
| | | | - Michael Stumvoll
- Medical Department III—Endocrinology, Nephrology, Rheumatology, University of Leipzig Medical Center, 04103 Leipzig, Germany
- Helmholtz Institute for Metabolic, Obesity and Vascular Research (HI-MAG) of the Helmholtz Zentrum München at the University of Leipzig and University Hospital Leipzig, 04103 Leipzig, Germany
| | - Matthias Blüher
- Medical Department III—Endocrinology, Nephrology, Rheumatology, University of Leipzig Medical Center, 04103 Leipzig, Germany
- Helmholtz Institute for Metabolic, Obesity and Vascular Research (HI-MAG) of the Helmholtz Zentrum München at the University of Leipzig and University Hospital Leipzig, 04103 Leipzig, Germany
| | - Peter Kovacs
- Medical Department III—Endocrinology, Nephrology, Rheumatology, University of Leipzig Medical Center, 04103 Leipzig, Germany
| | - Esther Guiu-Jurado
- Medical Department III—Endocrinology, Nephrology, Rheumatology, University of Leipzig Medical Center, 04103 Leipzig, Germany
- Deutsches Zentrum für Diabetesforschung e.V., 85764 Neuherberg, Germany
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Sun C, Förster F, Gutsmann B, Moulla Y, Stroh C, Dietrich A, Schön MR, Gärtner D, Lohmann T, Dressler M, Stumvoll M, Blüher M, Kovacs P, Breitfeld J, Guiu-Jurado E. Metabolic Effects of the Waist-To-Hip Ratio Associated Locus GRB14/COBLL1 Are Related to GRB14 Expression in Adipose Tissue. Int J Mol Sci 2022; 23:ijms23158558. [PMID: 35955692 PMCID: PMC9369072 DOI: 10.3390/ijms23158558] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2022] [Revised: 07/27/2022] [Accepted: 07/28/2022] [Indexed: 02/04/2023] Open
Abstract
GRB14/COBLL1 locus has been shown to be associated with body fat distribution (FD), but neither the causal gene nor its role in metabolic diseases has been elucidated. We hypothesize that GRB14/COBLL1 may act as the causal genes for FD-related SNPs (rs10195252 and rs6738627), and that they may be regulated by SNP to effect obesity-related metabolic traits. We genotyped rs10195252 and rs6738627 in 2860 subjects with metabolic phenotypes. In a subgroup of 560 subjects, we analyzed GRB14/COBLL1 gene expression in paired visceral and subcutaneous adipose tissue (AT) samples. Mediation analyses were used to determine the causal relationship between SNPs, AT GRB14/COBLL1 mRNA expression, and obesity-related traits. In vitro gene knockdown of Grb14/Cobll1 was used to test their role in adipogenesis. Both gene expressions in AT are correlated with waist circumference. Visceral GRB14 mRNA expression is associated with FPG and HbA1c. Both SNPs are associated with triglycerides, FPG, and leptin levels. Rs10195252 is associated with HbA1c and seems to be mediated by visceral AT GRB14 mRNA expression. Our data support the role of the GRB14/COBLL1 gene expression in body FD and its locus in metabolic sequelae: in particular, lipid metabolism and glucose homeostasis, which is likely mediated by AT GRB14 transcript levels.
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Affiliation(s)
- Chang Sun
- Medical Department III—Endocrinology, Nephrology, Rheumatology, University of Leipzig Medical Center, 04103 Leipzig, Germany; (C.S.); (F.F.); (B.G.); (M.S.); (M.B.); (P.K.); (J.B.)
| | - Franz Förster
- Medical Department III—Endocrinology, Nephrology, Rheumatology, University of Leipzig Medical Center, 04103 Leipzig, Germany; (C.S.); (F.F.); (B.G.); (M.S.); (M.B.); (P.K.); (J.B.)
| | - Beate Gutsmann
- Medical Department III—Endocrinology, Nephrology, Rheumatology, University of Leipzig Medical Center, 04103 Leipzig, Germany; (C.S.); (F.F.); (B.G.); (M.S.); (M.B.); (P.K.); (J.B.)
| | - Yusef Moulla
- Clinic for Visceral, Transplantation and Thorax and Vascular Surgery, University Hospital Leipzig, 04103 Leipzig, Germany; (Y.M.); (A.D.)
| | - Christine Stroh
- Departement of Obesity and Metabolic Surgery, SRH Wald-Klinikum Gera Str.d. Friedens 122, 07548 Gera, Germany;
| | - Arne Dietrich
- Clinic for Visceral, Transplantation and Thorax and Vascular Surgery, University Hospital Leipzig, 04103 Leipzig, Germany; (Y.M.); (A.D.)
| | - Michael R. Schön
- Städtisches Klinikum Karlsruhe, Clinic of Visceral Surgery, 76133 Karlsruhe, Germany; (M.R.S.); (D.G.)
| | - Daniel Gärtner
- Städtisches Klinikum Karlsruhe, Clinic of Visceral Surgery, 76133 Karlsruhe, Germany; (M.R.S.); (D.G.)
| | - Tobias Lohmann
- Municipal Clinic Dresden-Neustadt, 01129 Dresden, Germany; (T.L.); (M.D.)
| | - Miriam Dressler
- Municipal Clinic Dresden-Neustadt, 01129 Dresden, Germany; (T.L.); (M.D.)
| | - Michael Stumvoll
- Medical Department III—Endocrinology, Nephrology, Rheumatology, University of Leipzig Medical Center, 04103 Leipzig, Germany; (C.S.); (F.F.); (B.G.); (M.S.); (M.B.); (P.K.); (J.B.)
- Helmholtz Institute for Metabolic, Obesity and Vascular Research (HI-MAG) of the Helmholtz Zentrum München at the University of Leipzig and University Hospital Leipzig, 04103 Leipzig, Germany
| | - Matthias Blüher
- Medical Department III—Endocrinology, Nephrology, Rheumatology, University of Leipzig Medical Center, 04103 Leipzig, Germany; (C.S.); (F.F.); (B.G.); (M.S.); (M.B.); (P.K.); (J.B.)
- Helmholtz Institute for Metabolic, Obesity and Vascular Research (HI-MAG) of the Helmholtz Zentrum München at the University of Leipzig and University Hospital Leipzig, 04103 Leipzig, Germany
| | - Peter Kovacs
- Medical Department III—Endocrinology, Nephrology, Rheumatology, University of Leipzig Medical Center, 04103 Leipzig, Germany; (C.S.); (F.F.); (B.G.); (M.S.); (M.B.); (P.K.); (J.B.)
| | - Jana Breitfeld
- Medical Department III—Endocrinology, Nephrology, Rheumatology, University of Leipzig Medical Center, 04103 Leipzig, Germany; (C.S.); (F.F.); (B.G.); (M.S.); (M.B.); (P.K.); (J.B.)
| | - Esther Guiu-Jurado
- Medical Department III—Endocrinology, Nephrology, Rheumatology, University of Leipzig Medical Center, 04103 Leipzig, Germany; (C.S.); (F.F.); (B.G.); (M.S.); (M.B.); (P.K.); (J.B.)
- Helmholtz Institute for Metabolic, Obesity and Vascular Research (HI-MAG) of the Helmholtz Zentrum München at the University of Leipzig and University Hospital Leipzig, 04103 Leipzig, Germany
- Deutsches Zentrum für Diabetesforschung e.V., 85764 Neuherberg, Germany
- Correspondence:
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Milek M, Moulla Y, Kern M, Stroh C, Dietrich A, Schön MR, Gärtner D, Lohmann T, Dressler M, Kovacs P, Stumvoll M, Blüher M, Guiu-Jurado E. Adipsin Serum Concentrations and Adipose Tissue Expression in People with Obesity and Type 2 Diabetes. Int J Mol Sci 2022; 23:ijms23042222. [PMID: 35216336 PMCID: PMC8878597 DOI: 10.3390/ijms23042222] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2022] [Revised: 02/02/2022] [Accepted: 02/07/2022] [Indexed: 02/01/2023] Open
Abstract
(1) Adipsin is an adipokine that may link increased fat mass and adipose tissue dysfunction to obesity-related cardiometabolic diseases. Here, we investigated whether adipsin serum concentrations and adipose tissue (AT) adipsin mRNA expression are related to parameters of AT function, obesity and type 2 diabetes (T2D). (2) Methods: A cohort of 637 individuals with a wide range of age and body weight (Age: 18–85 years; BMI: 19–70 kg/m2) with (n = 237) or without (n = 400) T2D was analyzed for serum adipsin concentrations by ELISA and visceral (VAT) and subcutaneous (SAT) adipsin mRNA expression by RT-PCR. (3) Results: Adipsin serum concentrations were significantly higher in patients with T2D compared to normoglycemic individuals. We found significant positive univariate relationships of adipsin serum concentrations with age (r = 0.282, p < 0.001), body weight (r = 0.264, p < 0.001), fasting plasma glucose (r = 0.136, p = 0.006) and leptin serum concentrations (r = 0.362, p < 0.001). Neither VAT nor SAT adipsin mRNA expression correlated with adipsin serum concentrations after adjusting for age, sex and BMI. Independent of T2D status, we found significantly higher adipsin expression in SAT compared to VAT (4) Conclusions: Our data suggest that adipsin serum concentrations are strongly related to obesity and age. However, neither circulating adipsin nor adipsin AT expression reflects parameters of impaired glucose or lipid metabolism in patients with obesity with or without T2D.
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Affiliation(s)
- Margarete Milek
- Medical Department III—Endocrinology, Nephrology, Rheumatology, University of Leipzig Medical Center, 04103 Leipzig, Germany; (M.M.); (P.K.); (M.S.)
| | - Yusef Moulla
- Clinic for Visceral, Transplantation and Thorax and Vascular Surgery, University Hospital Leipzig, 04103 Leipzig, Germany; (Y.M.); (A.D.)
| | - Matthias Kern
- Helmholtz Institute for Metabolic, Obesity and Vascular Research (HI-MAG) of the Helmholtz Zentrum München at the University of Leipzig and University Hospital Leipzig, 04103 Leipzig, Germany;
| | - Christine Stroh
- Department of General, Abdominal and Pediatric Surgery, Municipal Hospital, 07548 Gera, Germany;
| | - Arne Dietrich
- Clinic for Visceral, Transplantation and Thorax and Vascular Surgery, University Hospital Leipzig, 04103 Leipzig, Germany; (Y.M.); (A.D.)
| | - Michael R Schön
- Städtisches Klinikum Karlsruhe, Clinic of Visceral Surgery, 76133 Karlsruhe, Germany; (M.R.S.); (D.G.)
| | - Daniel Gärtner
- Städtisches Klinikum Karlsruhe, Clinic of Visceral Surgery, 76133 Karlsruhe, Germany; (M.R.S.); (D.G.)
| | - Tobias Lohmann
- Municipal Clinic Dresden-Neustadt, 01129 Dresden, Germany; (T.L.); (M.D.)
| | - Miriam Dressler
- Municipal Clinic Dresden-Neustadt, 01129 Dresden, Germany; (T.L.); (M.D.)
| | - Peter Kovacs
- Medical Department III—Endocrinology, Nephrology, Rheumatology, University of Leipzig Medical Center, 04103 Leipzig, Germany; (M.M.); (P.K.); (M.S.)
| | - Michael Stumvoll
- Medical Department III—Endocrinology, Nephrology, Rheumatology, University of Leipzig Medical Center, 04103 Leipzig, Germany; (M.M.); (P.K.); (M.S.)
- Helmholtz Institute for Metabolic, Obesity and Vascular Research (HI-MAG) of the Helmholtz Zentrum München at the University of Leipzig and University Hospital Leipzig, 04103 Leipzig, Germany;
| | - Matthias Blüher
- Medical Department III—Endocrinology, Nephrology, Rheumatology, University of Leipzig Medical Center, 04103 Leipzig, Germany; (M.M.); (P.K.); (M.S.)
- Helmholtz Institute for Metabolic, Obesity and Vascular Research (HI-MAG) of the Helmholtz Zentrum München at the University of Leipzig and University Hospital Leipzig, 04103 Leipzig, Germany;
- Correspondence: (M.B.); (E.G.-J.); Tel.: +49-341-972-2901 (M.B.); +49-341-971-5895 (E.G.-J.)
| | - Esther Guiu-Jurado
- Medical Department III—Endocrinology, Nephrology, Rheumatology, University of Leipzig Medical Center, 04103 Leipzig, Germany; (M.M.); (P.K.); (M.S.)
- Helmholtz Institute for Metabolic, Obesity and Vascular Research (HI-MAG) of the Helmholtz Zentrum München at the University of Leipzig and University Hospital Leipzig, 04103 Leipzig, Germany;
- Deutsches Zentrum für Diabetesforschung e.V., 85764 Oberschleißheim, Germany
- Correspondence: (M.B.); (E.G.-J.); Tel.: +49-341-972-2901 (M.B.); +49-341-971-5895 (E.G.-J.)
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Gärtner D, Stroh C, Hukauf M, Benedix F, Manger T. Sleeve gastrectomy in the German Bariatric Surgery Registry from 2005 to 2016: Perioperative and 5-year results. Surg Obes Relat Dis 2019; 15:187-193. [DOI: 10.1016/j.soard.2018.11.005] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2018] [Revised: 10/14/2018] [Accepted: 11/02/2018] [Indexed: 02/07/2023]
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Keller M, Klös M, Rohde K, Krüger J, Kurze T, Dietrich A, Schön MR, Gärtner D, Lohmann T, Dreßler M, Stumvoll M, Blüher M, Kovacs P, Böttcher Y. DNA methylation of SSPN is linked to adipose tissue distribution and glucose metabolism. FASEB J 2018; 32:fj201800528R. [PMID: 29932866 DOI: 10.1096/fj.201800528r] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/28/2024]
Abstract
DNA methylation is a crucial epigenetic mechanism in obesity and fat distribution. We explored the Sarcospan ( SSPN) gene locus by using genome-wide data sets comprising methylation and expression data, pyrosequencing analysis in the promoter region, and genetic analysis of an SNP variant rs718314, which was previously reported to associate with waist-to-hip ratio. We found that DNA methylation influences several clinical variables related to fat distribution and glucose metabolism, while SSPN mRNA levels showed directionally opposite effects on these traits. Complete DNA methylation of the SSPN promoter construct suppressed the gene expression of firefly luciferase in MCF7 cells. Moreover, rs718314 was associated with waist and with DNA methylation at CpG sites. Our data strongly support the role of the SSPN locus in body fat composition and glucose homeostasis, and suggest that this is most likely the result of changes in DNA methylation of SSPN in adipose tissue.-Keller, M., Klös, M., Rohde, K., Krüger, J., Kurze, T., Dietrich, A., Schön, M. R., Gärtner, D., Lohmann, T., Dreßler, M., Stumvoll, M., Blüher, M., Kovacs, P., Böttcher, Y. DNA methylation of SSPN is linked to adipose tissue distribution and glucose metabolism.
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Affiliation(s)
- Maria Keller
- Integrated Research and Treatment Center (IFB) Adiposity Diseases, University of Leipzig, Leipzig, Germany
- Genetic and Molecular Epidemiology Unit, Department of Clinical Sciences, Lund University Diabetes Centre, Skåne University Hospital, Malmö, Sweden
| | - Matthias Klös
- Integrated Research and Treatment Center (IFB) Adiposity Diseases, University of Leipzig, Leipzig, Germany
- Department of Environmental Immunology, Helmholtz Centre for Environmental Research (UFZ), Leipzig, Germany
| | - Kerstin Rohde
- Integrated Research and Treatment Center (IFB) Adiposity Diseases, University of Leipzig, Leipzig, Germany
- Institute of Clinical Medicine, Akershus University Hospital, University of Oslo, Lørenskog, Norway
| | | | - Tabea Kurze
- Integrated Research and Treatment Center (IFB) Adiposity Diseases, University of Leipzig, Leipzig, Germany
| | - Arne Dietrich
- Department of Surgery, University of Leipzig, Leipzig, Germany
| | - Michael R Schön
- Städtisches Klinikum Karlsruhe, Clinic of Visceral Surgery, Karlsruhe, Germany; and
| | - Daniel Gärtner
- Städtisches Klinikum Karlsruhe, Clinic of Visceral Surgery, Karlsruhe, Germany; and
| | | | | | | | - Matthias Blüher
- Department of Medicine, University of Leipzig, Leipzig, Germany
| | - Peter Kovacs
- Integrated Research and Treatment Center (IFB) Adiposity Diseases, University of Leipzig, Leipzig, Germany
| | - Yvonne Böttcher
- Integrated Research and Treatment Center (IFB) Adiposity Diseases, University of Leipzig, Leipzig, Germany
- Institute of Clinical Medicine, Akershus University Hospital, University of Oslo, Lørenskog, Norway
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Langhardt J, Flehmig G, Klöting N, Lehmann S, Ebert T, Kern M, Schön MR, Gärtner D, Lohmann T, Dressler M, Fasshauer M, Kovacs P, Stumvoll M, Dietrich A, Blüher M. Effects of Weight Loss on Glutathione Peroxidase 3 Serum Concentrations and Adipose Tissue Expression in Human Obesity. Obes Facts 2018; 11:475-490. [PMID: 30537708 PMCID: PMC6341324 DOI: 10.1159/000494295] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/17/2017] [Accepted: 10/05/2018] [Indexed: 12/14/2022] Open
Abstract
BACKGROUND/AIMS Altered expression and circulating levels of glutathione peroxidase 3 (GPX3) have been observed in obesity and type 2 diabetes (T2D) across species. Here, we investigate whether GPX3 serum concentrations and adipose tissue (AT) GPX3 mRNA expression are related to obesity and weight loss. METHODS GPX3 serum concentration was measured in 630 individuals, including a subgroup (n = 293) for which omental and subcutaneous (SC) GPX3 mRNA expression has been analyzed. GPX3 analyses include three interventions: 6 months after bariatric surgery (n = 80) or combined exercise/hypocaloric diet (n = 20) or two-step bariatric surgery (n = 24) studies. RESULTS Bariatric surgery-induced weight loss (-25.8 ± 8.4%), but not a moderate weight reduction of -8.8 ± 6.5% was associated with significantly reduced GPX3 serum concentrations. GPX3 mRNA is significantly higher expressed in AT from individuals with normal glucose metabolism compared to T2D patients. SC AT GPX3 expression is significantly higher in lean compared to obese as well as in insulin-sensitive compared insulin-resistant individuals with obesity. Weight loss after bariatric surgery causes a significant increase in SC AT GPX3 expression. AT GPX3 expression significantly correlates with age, BMI, fat distribution, insulin sensitivity (only SC AT), but not with circulating GPX3. CONCLUSION Our data support the notion that SC AT GPX3 expression is associated with obesity, fat distribution and related to whole body insulin resistance.
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Affiliation(s)
- Julia Langhardt
- Department of Medicine, University of Leipzig, Leipzig, Germany
| | - Gesine Flehmig
- Department of Medicine, University of Leipzig, Leipzig, Germany
| | - Nora Klöting
- IFB ObesityDiseases, Junior Research Group Animal Models, University of Leipzig, Leipzig, Germany
| | | | - Thomas Ebert
- Department of Medicine, University of Leipzig, Leipzig, Germany
| | - Matthias Kern
- Department of Medicine, University of Leipzig, Leipzig, Germany
| | - Michael R Schön
- Städtisches Klinikum Karlsruhe, Clinic of Visceral Surgery, Karlsruhe, Germany
| | - Daniel Gärtner
- Städtisches Klinikum Karlsruhe, Clinic of Visceral Surgery, Karlsruhe, Germany
| | | | | | | | - Peter Kovacs
- IFB ObesityDiseases, University of Leipzig, Leipzig, Germany
| | | | - Arne Dietrich
- Department of Surgery, University of Leipzig, Leipzig, Germany
| | - Matthias Blüher
- Department of Medicine, University of Leipzig, Leipzig, Germany,
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Abstract
BACKGROUND Staple line and anastomotic leakages are life-threatening complications after bariatric surgery. Upper gastrointestinal (GI) tract X-ray examination with oral administration of a water-soluble contrast agent can be used to detect leaks. The aim of this study was to evaluate the impact of routine upper GI tract fluoroscopy after primary bariatric surgery. METHODS Between January 2009 and December 2014 a total of 658 bariatric interventions were carried out of which 442 were primary bariatric operations. Included in this single center study were 307 sleeve gastrectomies and 135 Roux-en-Y gastric bypasses. Up to December 2012 upper GI tract fluoroscopy was performed routinely between the first and third postoperative days and the detection of leakages was evaluated. RESULTS In the investigation period 8 leakages (2.6 %) after sleeve gastrectomy, 1 anastomotic leakage in gastrojejunostomy and 1 in jejunojejunostomy after Roux-en-Y gastric bypass occurred. All patients developed clinical symptoms, such as abdominal pain, tachycardia or fever. In one case the leakage was detected by upper GI fluoroscopy and in nine cases radiological findings were unremarkable. No leakages were detected in asymptomatic patients. CONCLUSION Routine upper GI fluoroscopy is not recommended for uneventful postoperative courses after primary bariatric surgery.
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Affiliation(s)
- D Gärtner
- Klinik für Allgemein- und Visceralchirurgie, Städtisches Klinikum Karlsruhe, Moltkestr. 90, 76133, Karlsruhe, Deutschland.
| | - A Ernst
- Klinik für Allgemein- und Visceralchirurgie, Städtisches Klinikum Karlsruhe, Moltkestr. 90, 76133, Karlsruhe, Deutschland
| | - K Fedtke
- Klinik für Allgemein- und Visceralchirurgie, Städtisches Klinikum Karlsruhe, Moltkestr. 90, 76133, Karlsruhe, Deutschland
| | - J Jenkner
- Klinik für Gefäß- und Thoraxchirurgie, Städtisches Klinikum Karlsruhe, Karlsruhe, Deutschland
| | - A Schöttler
- Klinik für Allgemein- und Visceralchirurgie, Städtisches Klinikum Karlsruhe, Moltkestr. 90, 76133, Karlsruhe, Deutschland
| | - P Reimer
- Institut für diagnostische und interventionelle Radiologie, Städtisches Klinikum Karlsruhe, Karlsruhe, Deutschland
| | - M Blüher
- Klinik und Poliklinik für Endokrinologie und Nephrologie, Universitätsklinikum Leipzig, Leipzig, Deutschland
| | - M R Schön
- Klinik für Allgemein- und Visceralchirurgie, Städtisches Klinikum Karlsruhe, Moltkestr. 90, 76133, Karlsruhe, Deutschland
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Keller M, Hopp L, Liu X, Wohland T, Rohde K, Cancello R, Klös M, Bacos K, Kern M, Eichelmann F, Dietrich A, Schön MR, Gärtner D, Lohmann T, Dreßler M, Stumvoll M, Kovacs P, DiBlasio AM, Ling C, Binder H, Blüher M, Böttcher Y. Genome-wide DNA promoter methylation and transcriptome analysis in human adipose tissue unravels novel candidate genes for obesity. Mol Metab 2016; 6:86-100. [PMID: 28123940 PMCID: PMC5220399 DOI: 10.1016/j.molmet.2016.11.003] [Citation(s) in RCA: 72] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/25/2016] [Revised: 11/03/2016] [Accepted: 11/10/2016] [Indexed: 02/04/2023] Open
Abstract
Objective/methods DNA methylation plays an important role in obesity and related metabolic complications. We examined genome-wide DNA promoter methylation along with mRNA profiles in paired samples of human subcutaneous adipose tissue (SAT) and omental visceral adipose tissue (OVAT) from non-obese vs. obese individuals. Results We identified negatively correlated methylation and expression of several obesity-associated genes in our discovery dataset and in silico replicated ETV6 in two independent cohorts. Further, we identified six adipose tissue depot-specific genes (HAND2, HOXC6, PPARG, SORBS2, CD36, and CLDN1). The effects were further supported in additional independent cohorts. Our top hits might play a role in adipogenesis and differentiation, obesity, lipid metabolism, and adipose tissue expandability. Finally, we show that in vitro methylation of SORBS2 directly represses gene expression. Conclusions Taken together, our data show distinct tissue specific epigenetic alterations which associate with obesity. Obesity-associated differences in DNA promoter methylation and transcriptome in human adipose tissue (ETV6). Depot-specific analyses revealed novel/known genes (HAND2, HOXC6, PPARG, SORBS2, CD36, CLDN1). EWAS revealed SSPN and CCDC125 associated to BMI in SAT or OVAT, respectively. Differentially methylated genes overlap in part with GWAS hits for obesity and fat distribution.
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Affiliation(s)
- Maria Keller
- IFB Adiposity Diseases, University of Leipzig, Leipzig, 04103, Germany
| | - Lydia Hopp
- Interdisciplinary Centre for Bioinformatics, University of Leipzig, Leipzig, 04103, Germany
| | - Xuanshi Liu
- IFB Adiposity Diseases, University of Leipzig, Leipzig, 04103, Germany; Bioinformatics Group, Department of Computer Science, University of Leipzig, 04107, Leipzig, Germany
| | - Tobias Wohland
- IFB Adiposity Diseases, University of Leipzig, Leipzig, 04103, Germany
| | - Kerstin Rohde
- IFB Adiposity Diseases, University of Leipzig, Leipzig, 04103, Germany
| | - Raffaella Cancello
- Molecular Biology Laboratory, Istituto Auxologico Italiano IRCCS, Milan, 20149, Italy
| | - Matthias Klös
- IFB Adiposity Diseases, University of Leipzig, Leipzig, 04103, Germany
| | - Karl Bacos
- Epigenetics and Diabetes Unit, Department of Clinical Sciences, Lund University Diabetes Centre, Scania University Hospital, 205 02, Malmoe, Sweden
| | - Matthias Kern
- Department of Medicine, University of Leipzig, Leipzig, 04103, Germany
| | - Fabian Eichelmann
- IFB Adiposity Diseases, University of Leipzig, Leipzig, 04103, Germany
| | - Arne Dietrich
- IFB Adiposity Diseases, University of Leipzig, Leipzig, 04103, Germany; Department of Surgery, University of Leipzig, Leipzig, 04103, Germany
| | - Michael R Schön
- Städtisches Klinikum Karlsruhe, Clinic of Visceral Surgery, Karlsruhe, 76133, Germany
| | - Daniel Gärtner
- Städtisches Klinikum Karlsruhe, Clinic of Visceral Surgery, Karlsruhe, 76133, Germany
| | - Tobias Lohmann
- Municipal Clinic Dresden-Neustadt, Dresden, 01129, Germany
| | - Miriam Dreßler
- Municipal Clinic Dresden-Neustadt, Dresden, 01129, Germany
| | - Michael Stumvoll
- IFB Adiposity Diseases, University of Leipzig, Leipzig, 04103, Germany; Department of Medicine, University of Leipzig, Leipzig, 04103, Germany
| | - Peter Kovacs
- IFB Adiposity Diseases, University of Leipzig, Leipzig, 04103, Germany
| | - Anna-Maria DiBlasio
- Molecular Biology Laboratory, Istituto Auxologico Italiano IRCCS, Milan, 20149, Italy
| | - Charlotte Ling
- Epigenetics and Diabetes Unit, Department of Clinical Sciences, Lund University Diabetes Centre, Scania University Hospital, 205 02, Malmoe, Sweden
| | - Hans Binder
- Interdisciplinary Centre for Bioinformatics, University of Leipzig, Leipzig, 04103, Germany
| | - Matthias Blüher
- IFB Adiposity Diseases, University of Leipzig, Leipzig, 04103, Germany; Department of Medicine, University of Leipzig, Leipzig, 04103, Germany.
| | - Yvonne Böttcher
- IFB Adiposity Diseases, University of Leipzig, Leipzig, 04103, Germany.
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9
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Mardinoglu A, Heiker JT, Gärtner D, Björnson E, Schön MR, Flehmig G, Klöting N, Krohn K, Fasshauer M, Stumvoll M, Nielsen J, Blüher M. Extensive weight loss reveals distinct gene expression changes in human subcutaneous and visceral adipose tissue. Sci Rep 2015; 5:14841. [PMID: 26434764 PMCID: PMC4593186 DOI: 10.1038/srep14841] [Citation(s) in RCA: 55] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2015] [Accepted: 09/02/2015] [Indexed: 12/19/2022] Open
Abstract
Weight loss has been shown to significantly improve Adipose tissue (AT) function, however changes in AT gene expression profiles particularly in visceral AT (VAT) have not been systematically studied. Here, we tested the hypothesis that extensive weight loss in response to bariatric surgery (BS) causes AT gene expression changes, which may affect energy and lipid metabolism, inflammation and secretory function of AT. We assessed gene expression changes by whole genome expression chips in AT samples obtained from six morbidly obese individuals, who underwent a two step BS strategy with sleeve gastrectomy as initial and a Roux-en-Y gastric bypass as second step surgery after 12 ± 2 months. Global gene expression differences in VAT and subcutaneous (S)AT were analyzed through the use of genome-scale metabolic model (GEM) for adipocytes. Significantly altered gene expressions were PCR-validated in 16 individuals, which also underwent a two-step surgery intervention. We found increased expression of cell death-inducing DFFA-like effector a (CIDEA), involved in formation of lipid droplets in both fat depots in response to significant weight loss. We observed that expression of the genes associated with metabolic reactions involved in NAD+, glutathione and branched chain amino acid metabolism are significantly increased in AT depots after surgery-induced weight loss.
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Affiliation(s)
- Adil Mardinoglu
- Department of Biology and Biological Engineering, Chalmers University of Technology, SE-412 96, Gothenburg, Sweden.,Science for Life Laboratory, KTH - Royal Institute of Technology, SE-171 21, Stockholm, Sweden
| | - John T Heiker
- University of Leipzig, Department of Medicine, Leipzig, Germany
| | - Daniel Gärtner
- Städtisches Klinikum Karlsruhe, Clinic of Visceral Surgery, Karlsruhe, Germany
| | - Elias Björnson
- Department of Biology and Biological Engineering, Chalmers University of Technology, SE-412 96, Gothenburg, Sweden
| | - Michael R Schön
- Städtisches Klinikum Karlsruhe, Clinic of Visceral Surgery, Karlsruhe, Germany
| | - Gesine Flehmig
- University of Leipzig, Department of Medicine, Leipzig, Germany
| | - Nora Klöting
- IFB Adiposity Diseases, Junior Research Group 2 "Animal models of obesity"
| | - Knut Krohn
- Core Unit DNA-Technologies, Interdisziplinäres Zentrum für Klinische Forschung (IZKF) Leipzig, Germany
| | | | | | - Jens Nielsen
- Department of Biology and Biological Engineering, Chalmers University of Technology, SE-412 96, Gothenburg, Sweden.,Science for Life Laboratory, KTH - Royal Institute of Technology, SE-171 21, Stockholm, Sweden
| | - Matthias Blüher
- University of Leipzig, Department of Medicine, Leipzig, Germany
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10
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Justinger C, Kouladouros K, Gärtner D, Tatsch K, Reimer P, Rüdiger T, Binnenhei M, Bentz M, Schön MR. Liver resection after selective internal radiotherapy (SIRT): Proof of concept, initial survival, and safety. J Surg Oncol 2015; 112:436-42. [PMID: 26256832 DOI: 10.1002/jso.24000] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2015] [Accepted: 07/21/2015] [Indexed: 02/06/2023]
Abstract
BACKGROUND AND OBJECTIVES Extent of liver resections are restricted by the volume of the future liver remnant. Different strategies have been developed to increase the frequency of curative resections. Selective internal radiation therapy (SIRT) has emerged as an effective therapy for patients with primary non-resectable malignancies of the liver. Here, we report the first clinical series of patients with curative liver resection following SIRT. METHODS Starting 2010, patients with marginally resectable liver metastases treated by SIRT followed by liver resection were identified and prospectively documented in a database for subsequent retrospective analysis. RESULTS Thirteen patients (five female, eight male; age 70 years [32-77 years]) with marginally resectable liver metastases were selected for liver resection after SIRT. After performing SIRT, 12 patients had potentially curative hepatic resection. In two patients, liver resection after SIRT could not be performed due to the appearance of new extrahepatic metastases. Analyzing the effect of SIRT, we observed a decrease in tumor size with central scaring. None of the patients developed liver necrosis after SIRT. Liver resection was performed safely in all patients. CONCLUSIONS The combination of SIRT with state-of-the-art liver surgery opens up new therapeutic options in patients with liver metastases.
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Affiliation(s)
- Christoph Justinger
- Department of General and Visceral Surgery, Städtisches Klinikum Karlsruhe, Karlsruhe, Germany
| | | | - Daniel Gärtner
- Department of General and Visceral Surgery, Städtisches Klinikum Karlsruhe, Karlsruhe, Germany
| | - Klaus Tatsch
- Department of Nuclear Medicine, Städtisches Klinikum Karlsruhe, Karlsruhe, Germany
| | - Peter Reimer
- Department of Diagnostic and Interventional Radiology, Städtisches Klinikum Karlsruhe, Karlsruhe, Germany
| | - Thomas Rüdiger
- Department of Pathology, Städtisches Klinikum Karlsruhe, Karlsruhe, Germany
| | - Martin Binnenhei
- Department of Oncology, Städtisches Klinikum Karlsruhe, Karlsruhe, Germany
| | - Martin Bentz
- Department of Oncology, Städtisches Klinikum Karlsruhe, Karlsruhe, Germany
| | - Michael R Schön
- Department of General and Visceral Surgery, Städtisches Klinikum Karlsruhe, Karlsruhe, Germany
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11
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Fischer L, Wekerle AL, Bruckner T, Wegener I, Diener MK, Frankenberg MV, Gärtner D, Schön MR, Raggi MC, Tanay E, Brydniak R, Runkel N, Attenberger C, Son MS, Türler A, Weiner R, Büchler MW, Müller-Stich BP. BariSurg trial: Sleeve gastrectomy versus Roux-en-Y gastric bypass in obese patients with BMI 35-60 kg/m(2) - a multi-centre randomized patient and observer blind non-inferiority trial. BMC Surg 2015; 15:87. [PMID: 26187377 PMCID: PMC4506636 DOI: 10.1186/s12893-015-0072-7] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2013] [Accepted: 07/08/2015] [Indexed: 02/08/2023] Open
Abstract
Background Roux-en-Ygastric bypass (RYGB) and sleeve gastrectomy (SG) rank among the most frequently applied bariatric procedures worldwide due to their positive risk/benefit correlation. A systematic review revealed a similar excess weight loss (EWL) 2 years postoperatively between SG and RYGB. However, there is a lack of randomized controlled multi-centre trials comparing SG and RYGB, not only concerning EWL, but also in terms of remission of obesity-related co-morbidities, gastroesophageal reflux disease (GERD) and quality of life (QoL) in the mid- and long-term. Methods The BariSurg trial was designed as a multi-centre, randomized controlled patient and observer blind trial. The trial protocol was approved by the corresponding ethics committees of the centres. To demonstrate EWL non-inferiority of SG compared to RYGB, power calculation was performed according to a non-inferiority study design. Morbidity, mortality, remission of obesity-related co-morbidities, GERD course and QoL are major secondary endpoints. 248 patients between 18 and 70 years, with a body mass index (BMI) between 35–60 kg/m2 and indication for bariatric surgery according to the most recent German S3-guidelines will be randomized. The primary and secondary endpoints will be assessed prior to surgery and afterwards at discharge and at the time points 3–6, 12, 24, 36, 48 and 60 months postoperatively. Discussion With its five year follow-up, the BariSurg-trial will provide further evidence based data concerning the impact of SG and RYGB on EWL, remission of obesity-related co-morbidities, the course of GERD and QoL. Trial registration The trial protocol has been registered in the German Clinical Trials Register DRKS00004766.
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Affiliation(s)
- Lars Fischer
- Department of General, Visceral and Transplantation Surgery, University of Heidelberg, Im Neuenheimer Feld 110, 69120, Heidelberg, Germany.
| | - Anna-Laura Wekerle
- Department of General, Visceral and Transplantation Surgery, University of Heidelberg, Im Neuenheimer Feld 110, 69120, Heidelberg, Germany
| | - Thomas Bruckner
- Institute of Medical Biometry and Informatics, University of Heidelberg, Im Neuenheimer Feld 305, 69120, Heidelberg, Germany
| | - Inga Wegener
- Study Centre of the German Surgical Society (SDGC), University of Heidelberg, Im Neuenheimer Feld 110, 69120, Heidelberg, Germany
| | - Markus K Diener
- Department of General, Visceral and Transplantation Surgery, University of Heidelberg, Im Neuenheimer Feld 110, 69120, Heidelberg, Germany.,Study Centre of the German Surgical Society (SDGC), University of Heidelberg, Im Neuenheimer Feld 110, 69120, Heidelberg, Germany
| | | | - Daniel Gärtner
- Department of General and Visceral Surgery, Städtisches Krankenhaus Karlsruhe, Moltkestraße 90, 76133, Karlsruhe, Germany
| | - Michael R Schön
- Department of General and Visceral Surgery, Städtisches Krankenhaus Karlsruhe, Moltkestraße 90, 76133, Karlsruhe, Germany
| | - Matthias C Raggi
- Department of General and Visceral Surgery, Agaplesion Bethesda Krankenhaus Stuttgart, Hohenheimer Straße 21, 70184, Stuttgart, Germany
| | - Emre Tanay
- Department of General and Visceral Surgery, Agaplesion Bethesda Krankenhaus Stuttgart, Hohenheimer Straße 21, 70184, Stuttgart, Germany
| | - Rainer Brydniak
- Department of General and Visceral Surgery, Schwarzwald- Baar Klinikum, Klinikstraße 11, 78052, Villingen-Schwenningen, Germany
| | - Norbert Runkel
- Department of General and Visceral Surgery, Schwarzwald- Baar Klinikum, Klinikstraße 11, 78052, Villingen-Schwenningen, Germany
| | - Corinna Attenberger
- Department of Surgery, Caritas-Krankenhaus St. Josef, Landshuter Straße 65, 93053, Regensburg, Germany
| | - Min-Seop Son
- Department of General and Visceral Surgery, Johanniter Krankenhaus, Johanniter GmbH, Johanniterstraße 3, 53113, Bonn, Germany
| | - Andreas Türler
- Department of General and Visceral Surgery, Johanniter Krankenhaus, Johanniter GmbH, Johanniterstraße 3, 53113, Bonn, Germany
| | - Rudolf Weiner
- Department of Bariatric Surgery and Metabolic Surgery, Sana Klinikum Offenbach GmbH, Starkenburgring 66, 63069, Offenbach, Germany
| | - Markus W Büchler
- Department of General, Visceral and Transplantation Surgery, University of Heidelberg, Im Neuenheimer Feld 110, 69120, Heidelberg, Germany
| | - Beat P Müller-Stich
- Department of General, Visceral and Transplantation Surgery, University of Heidelberg, Im Neuenheimer Feld 110, 69120, Heidelberg, Germany
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12
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Keller M, Hopp L, Liu XL, Rohde K, Klös M, Dietrich A, Schön MR, Gärtner D, Lohmann T, Dreßler M, Stumvoll M, Kovacs P, Binder H, Blüher M, Böttcher Y. Genome wide DNA promoter methylation: Differences in human subcutaneous vs. omental visceral adipose tissue. DIABETOL STOFFWECHS 2015. [DOI: 10.1055/s-0035-1549509] [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: 10/23/2022]
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13
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Knigge A, Klöting N, Schön MR, Dietrich A, Fasshauer M, Gärtner D, Lohmann T, Dreßler M, Stumvoll M, Kovacs P, Blüher M. ADCY5 gene expression in adipose tissue is related to obesity in men and mice. PLoS One 2015; 10:e0120742. [PMID: 25793868 PMCID: PMC4368112 DOI: 10.1371/journal.pone.0120742] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2014] [Accepted: 01/26/2015] [Indexed: 11/20/2022] Open
Abstract
Genome wide association studies revealed an association of the single nucleotide polymorphism rs11708067 within the ADCY5 gene—encoding adenylate cyclase 5—with increased type 2 diabetes (T2D) risk and higher fasting glucose. However, it remains unclear whether the association between ADCY5 variants and glycemic traits may involve adipose tissue (AT) related mechanisms. We therefore tested the hypothesis that ADCY5 mRNA expression in human and mouse AT is related to obesity, fat distribution, T2D in humans and high fat diet (HFD) in mice. We measured ADCY5 mRNA expression in paired samples of visceral and subcutaneous adipose tissue from 244 individuals with a wide range of body weight and parameters of hyperglycemia, which have been genotyped for rs11708067. In addition, AT ADCY5 mRNA was assessed in C57BL/6NTac which underwent a 10 weeks standard chow (n = 6) or high fat diet (HFD, n = 6). In humans, visceral ADCY5 expression is significantly higher in obese compared to lean individuals. ADCY5 expression correlates with BMI, body fat mass, circulating leptin, fat distribution, waist and hip circumference, but not with fasting plasma glucose and HbA1c. Adcy5 expression in mouse AT is significantly higher after a HFD compared to chow (p<0.05). Importantly, rs11708067 is not associated with ADCY5 mRNA expression levels in either fat depot in any of the genetic models tested. Our results suggest that changes in AT ADCY5 expression are related to obesity and fat distribution, but not with impaired glucose metabolism and T2D. However, altered ADCY5 expression in AT does not seem to be the mechanism underlying the association between rs11708067 and increased T2D risk.
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Affiliation(s)
- Anja Knigge
- Department of Medicine, Dermatology und Neurology, Department of Endocrinology und Nephrology, University of Leipzig, Leipzig, Germany
| | - Nora Klöting
- Department of Medicine, Dermatology und Neurology, Department of Endocrinology und Nephrology, University of Leipzig, Leipzig, Germany; Junior Research Group 2 "Animal models of obesity", Integriertes Forschungs- und Behandlungszentrum (IFB) Adiposity Diseases, University of Leipzig, Leipzig, Germany
| | - Michael R Schön
- Clinic of Visceral Surgery, Städtisches Klinikum Karlsruhe, Karlsruhe, Germany
| | - Arne Dietrich
- Department of Surgery, University of Leipzig, Leipzig, Germany
| | - Mathias Fasshauer
- Department of Medicine, Dermatology und Neurology, Department of Endocrinology und Nephrology, University of Leipzig, Leipzig, Germany
| | - Daniel Gärtner
- Clinic of Visceral Surgery, Städtisches Klinikum Karlsruhe, Karlsruhe, Germany
| | | | | | - Michael Stumvoll
- Department of Medicine, Dermatology und Neurology, Department of Endocrinology und Nephrology, University of Leipzig, Leipzig, Germany
| | - Peter Kovacs
- Integriertes Forschungs- und Behandlungszentrum (IFB) Adiposity Diseases, University of Leipzig, Leipzig, Germany
| | - Matthias Blüher
- Department of Medicine, Dermatology und Neurology, Department of Endocrinology und Nephrology, University of Leipzig, Leipzig, Germany
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14
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Keller M, Kralisch S, Rohde K, Schleinitz D, Dietrich A, Schön MR, Gärtner D, Lohmann T, Dreßler M, Tönjes A, Stumvoll M, Kovacs P, Fasshauer M, Blüher M, Böttcher Y. Global DNA methylation levels in human adipose tissue are related to fat distribution and glucose homeostasis. Diabetologia 2014; 57:2374-83. [PMID: 25145546 DOI: 10.1007/s00125-014-3356-z] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [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] [Received: 05/06/2014] [Accepted: 07/23/2014] [Indexed: 12/31/2022]
Abstract
AIMS/HYPOTHESIS Epigenetic alterations may influence the metabolic pathways involved in human obesity. We hypothesised that global DNA methylation levels in adipose tissue might be associated with obesity and related phenotypes. METHODS We measured global DNA methylation levels in paired samples of subcutaneous adipose tissue (SAT) and omental visceral adipose tissue (OVAT) from 51 individuals, and in leucocytes from 559 Sorbs, a population from Germany, using LUminometric Methylation Assay (LUMA). To further investigate the underlying mechanisms of the observed associations, we measured global methylation levels in 3T3-L1 adipocytes exposed to glucose, insulin and lipids. RESULTS Global methylation levels (±SD) were significantly higher in OVAT (74.27% ± 2.2%) compared with SAT (71.97% ± 2.4%; paired t test, p < 1 × 10(-9)). Furthermore, global methylation levels in SAT were positive correlates of measures of fat distribution (waist measurement, WHR) and glucose homeostasis (HbA1c) (all p < 0.015 after accounting for multiple testing and covariates). Global methylation levels in the German Sorb cohort were associated with glucose homeostasis, but this association did not withstand adjustment for covariates. Exposure of 3T3-L1 adipocytes to insulin, palmitate and glucose decreased global methylation levels 1 h after treatment relative to controls. CONCLUSIONS/INTERPRETATION Our data suggest that the variability in global methylation in adipose tissue might be related to alterations in glucose metabolism.
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Affiliation(s)
- Maria Keller
- Medical Faculty, IFB Adiposity Diseases, University of Leipzig, Liebigstrasse 21, 04103, Leipzig, Germany
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15
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Rohde K, Keller M, Klös M, Schleinitz D, Dietrich A, Schön MR, Gärtner D, Lohmann T, Dreßler M, Stumvoll M, Kovacs P, Blüher M, Böttcher Y. Promoter methylation of TMEM18 in subcutaneous adipose tissue is related to glucose homeostasis. DIABETOL STOFFWECHS 2014. [DOI: 10.1055/s-0034-1374915] [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: 10/25/2022]
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16
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Krist J, Wieder K, Klöting N, Oberbach A, Kralisch S, Wiesner T, Schön MR, Gärtner D, Dietrich A, Shang E, Lohmann T, Dreßler M, Fasshauer M, Stumvoll M, Blüher M. Effects of weight loss and exercise on apelin serum concentrations and adipose tissue expression in human obesity. Obes Facts 2013; 6:57-69. [PMID: 23429279 PMCID: PMC5644751 DOI: 10.1159/000348667] [Citation(s) in RCA: 80] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/10/2012] [Accepted: 08/03/2012] [Indexed: 01/17/2023] Open
Abstract
OBJECTIVE Apelin is an adipokine which plays a role in the regulation of glucose homeostasis and may contribute to the link between increased adipose tissue mass and obesity related metabolic diseases. Here we investigate the role of omental and subcutaneous (SC) adipose tissue apelin and its receptor APJ mRNA expression in human obesity and test the hypothesis that changes in circulating apelin are associated with reduced fat mass in three weight loss intervention studies. METHODS Apelin serum concentration was measured in 740 individuals in a cross-sectional (n = 629) study including a subgroup (n = 161) for which omental and SC apelin mRNA expression has been analyzed and in three interventions: 12 weeks exercise (n = 60), 6 months calorie-restricted diet (n = 19), 12 months after bariatric surgery (n = 32). RESULTS Apelin mRNA is significantly higher expressed in adipose tissue of patients with type 2 diabetes and correlates with circulating apelin, BMI, body fat, C-reactive protein, and insulin sensitivity. Obesity surgery-induced weight loss causes a significant reduction in omental and SC apelin expression. All interventions led to significantly reduced apelin serum concentrations which significantly correlate with improved insulin sensitivity, independently of changes in BMI. CONCLUSIONS Reduced apelin expression and serum concentration may contribute to improved insulin sensitivity beyond significant weight loss.
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Affiliation(s)
- Joanna Krist
- Department of Medicine, University of Leipzig, Junior Research Group Animal Models, Dresden, Germany
| | - Katharina Wieder
- Department of Medicine, University of Leipzig, Junior Research Group Animal Models, Dresden, Germany
| | - Nora Klöting
- Leipzig University Medical Center, IFB Adiposity Diseases, Junior Research Group Animal Models, Dresden, Germany
| | - Andreas Oberbach
- Department of Pediatric Surgery, University of Leipzig, Leipzig, Germany
| | - Susan Kralisch
- Department of Medicine, University of Leipzig, Junior Research Group Animal Models, Dresden, Germany
| | - Tobias Wiesner
- Department of Medicine, University of Leipzig, Junior Research Group Animal Models, Dresden, Germany
| | - Michael R. Schön
- Clinic of Visceral Surgery, Städtisches Klinikum Karlsruhe, Karlsruhe, Germany
| | - Daniel Gärtner
- Clinic of Visceral Surgery, Städtisches Klinikum Karlsruhe, Karlsruhe, Germany
| | - Arne Dietrich
- Department of Surgery, University of Leipzig, Dresden, Germany
| | - Edward Shang
- Department of Surgery, University of Leipzig, Dresden, Germany
| | | | | | - Mathias Fasshauer
- Department of Medicine, University of Leipzig, Junior Research Group Animal Models, Dresden, Germany
| | - Michael Stumvoll
- Department of Medicine, University of Leipzig, Junior Research Group Animal Models, Dresden, Germany
| | - Matthias Blüher
- Department of Medicine, University of Leipzig, Junior Research Group Animal Models, Dresden, Germany
- *Prof. Dr. med. Matthias Blüher, Department of Medicine, University of Leipzig, Liebigstraße 20, 04103 Leipzig (Germany),
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17
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Gärtner D, Münz K, Hückelheim E, Hesse U. Ultrasound scissors: new single-use instruments vs. resterilised single-use instruments - a prospective randomised study. GMS Krankenhhyg Interdiszip 2008; 3:Doc20. [PMID: 20204092 PMCID: PMC2831255] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 10/29/2022]
Abstract
BACKGROUND The aim of this study was to compare reliability in handling and function of resterilised and single-use disposable ultrasonic scissors. METHODS In a prospective randomized study, the surgeon blindly tested new and resterilised ultrasonic scissors. The parameters were force of activation, cutting effect, coagulation effect, error messages and disturbing generator noise. RESULTS 51 new and 49 resterilised instruments in 94 operations were evaluated. The differences in force of activation, cutting effect and coagulation were not significant. Error messages and disturbing noises were rare in both groups. 6 new instruments and 2 resterilised instruments had to be exchanged because of problems during surgery. CONCLUSION This study demonstrates comparable reliability in function and handling of resterilised and new ultrasonic scissors. The use of resterilised instruments leads to distinctly reduced costs and could contribute to efficiency in laparoscopic surgery.
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Affiliation(s)
- D. Gärtner
- Klinik für Allgemein- und Viszeralchirurgie, Klinikum Stuttgart, Krankenhaus Bad Cannstatt, Stuttgart, Deutschland
| | - K. Münz
- Klinik für Allgemein- und Viszeralchirurgie, Klinikum Stuttgart, Krankenhaus Bad Cannstatt, Stuttgart, Deutschland
| | - E. Hückelheim
- Klinik für Allgemein- und Viszeralchirurgie, Klinikum Stuttgart, Krankenhaus Bad Cannstatt, Stuttgart, Deutschland
| | - U. Hesse
- Klinik für Allgemein- und Viszeralchirurgie, Klinikum Stuttgart, Krankenhaus Bad Cannstatt, Stuttgart, Deutschland,*To whom correspondence should be addressed: U. Hesse, Klinik für Allgemein- und Viszeralchirurgie, Klinikum Stuttgart, Krankenhaus Bad Cannstatt, Prießnitzweg 24, 70374 Stuttgart, Deutschland, E-mail:
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18
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Hesse UJ, Gärtner D, Münz K, Hornung A. Laparoskopisches Magenband bei Patienten mit einem BMI dber 60 kg/m2 – macht es Sinn? Visc Med 2007. [DOI: 10.1159/000098429] [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: 11/19/2022] Open
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19
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Hesse U, Gärtner D. Adipositaschirurgie: Ablehnung der Kostenübernahme trotz ärztlicher Gutachten. Dtsch Med Wochenschr 2006. [DOI: 10.1055/s-2006-946569] [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: 10/24/2022]
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Gärtner D, Hoyer M, Hornung A, Andus T, Bischoff S, Hesse U. Adipositaschirurgie: Ablehnung der Kostenübernahme trotz ärztlicher Gutachten. Dtsch Med Wochenschr 2006; 131:258-62. [PMID: 16463228 DOI: 10.1055/s-2006-924958] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [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: 10/25/2022]
Abstract
BACKGROUND AND OBJECTIVE Surgery is an effective method to treat patients with morbid obesity. However health insurance companies frequently refuse to cover the costs for the procedure despite an existing DRG-code for this operation. Individual medical expertise are necessary to receive reimbursement. In the present study the acceptance of medical expertise to receive cost coverage was analysed in our patients of the years 2000-2003 eligible for obesity surgery. PATIENTS AND METHODS 617 medical expertise of patients eligible for obesity surgery in our hospital were reviewed and the acceptance rate was evaluated. Parameters such as body mass index, personal medical history, diets, comorbidity and prognosis were included. Expertise were submitted to the health care insurance companies and in case of acceptance the operation was performed. RESULTS The average age of our patients was 39.1 +/- 11.2 years, 72.1% were female, 27.9% male. The average BMI was 47.5 +/- 7.4 kg/m2. There was a high incidence of comorbidity in these patients (58.7% arterial hypertension, 38.6% diabetes mellitus, 95.8% dyspnoea, 96.1% arthropathy, 89.0% psychosocial disorders). The difference between accepted and non-accepted regarding these secondary complications was not significant. 209 patients (33.8%) were operated. 14 patients of these paid the costs themselves. Only in 195 cases (31.6%) the health care insurance company covered the costs for the operation. CONCLUSION The high number of refusals of medical expertise is not justified in view of the strict criteria for indication, the high frequency of comorbidity and the good results after the operation.
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Affiliation(s)
- D Gärtner
- Klinik für Allgemein-, Viszeral- und Unfallchirurgie, Krankenhaus Bad Cannstatt, Klinikum Stuttgart, Stuttgart
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Rossol M, Gärtner D, Hauschildt S. Diverse regulation of microfilament assembly, production of TNF-alpha, and reactive oxygen intermediates by actin modulating substances and inhibitors of ADP-ribosylation in human monocytes stimulated with LPS. Cell Motil Cytoskeleton 2001; 48:96-108. [PMID: 11169762 DOI: 10.1002/1097-0169(200102)48:2<96::aid-cm1001>3.0.co;2-b] [Citation(s) in RCA: 13] [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] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Lipopolysaccharide (LPS), a potent activator of human monocytes, induced F-actin polymerization in a concentration- and time-dependent manner. To test whether cytoskeletal events participate in the control of the LPS-induced ROI and TNF-alpha production, three natural occurring actin-modulating substances, cytochalasin D (Cyt D), latrunculin B (Lat B), and jasplakinolide (JK), were used. Here we show that treatment of monocytes with Cyt D, Lat B, or JK led to a rearrangement of the actin cytoskeleton, which upon addition of LPS was further modified. Cyt D and Lat B induced generation of ROI in the absence of LPS and enhanced the LPS-triggered respiratory burst. JK also proved to be a potent activator of ROI-production but only in the presence of LPS. TNF-alpha production was hardly affected by the three substances. There was no correlation between a specific state of Cyt D-, Lat B-, or JK-modified actin polymerization and ROI-production. Inhibitors of ADP-ribosylation proved to be activators of F-actin polymerization. They were shown to prevent ROI- and TNF-alpha production and to reduce the capability of LPS to mediate maximal F-actin assembly. At concentrations at which inhibition was greatest, maximal blockage of ROI and TNF-alpha production was observed. These findings may argue for a role of ADP-ribosylation in the transduction pathways mediating the biological responses, with involvement in the assembly of actin-containing cytoskeletal microfilaments.
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Affiliation(s)
- M Rossol
- Institute of Zoology, Department of Immunobiology, University of Leipzig, Leipzig, Germany
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Kraus A, Hueck C, Gärtner D, Hillen W. Catabolite repression of the Bacillus subtilis xyl operon involves a cis element functional in the context of an unrelated sequence, and glucose exerts additional xylR-dependent repression. J Bacteriol 1994; 176:1738-45. [PMID: 8132469 PMCID: PMC205262 DOI: 10.1128/jb.176.6.1738-1745.1994] [Citation(s) in RCA: 103] [Impact Index Per Article: 3.4] [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: 01/29/2023] Open
Abstract
Catabolite repression (CR) of xylose utilization by Bacillus subtilis involves a 14-bp cis-acting element (CRE) located in the translated region of the gene encoding xylose isomerase (xylA). Mutations of CRE making it more similar to a previously proposed consensus element lead to increased CR exerted by glucose, fructose, and glycerol. Fusion of CRE to an unrelated, constitutive promoter confers CR to beta-galactosidase expression directed by that promoter. This result demonstrates that CRE can function independently of sequence context and suggests that it is indeed a generally active cis element for CR. In contrast to the other carbon sources studied here, glucose leads to an additional repression of xylA expression, which is independent of CRE and is not found when CRE is fused to the unrelated promoter. This repression requires a functional xylR encoding Xyl repressor and is dependent on the concentrations of glucose and the inducer xylose in the culture broth. Potential mechanisms for this glucose-specific repression are discussed.
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Affiliation(s)
- A Kraus
- Lehrstuhl für Mikrobiologie, Institut für Mikrobiologie, Biochemie und Genetik der Friedrich-Alexander, Universität Erlangen-Nürnberg, Federal Republic of Germany
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Maguire DJ, Höper J, Casel G, Gärtner D. Perfused rat liver responses to crude venoms from marine snails. Adv Exp Med Biol 1994; 361:597-601. [PMID: 7541178 DOI: 10.1007/978-1-4615-1875-4_108] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Affiliation(s)
- D J Maguire
- Faculty of Science and Technology, Griffith University, Nathan, Brisbane, Australia
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Kauder C, Allmansberger R, Gärtner D, Schmiedel D, Hillen W. An operator binding-negative mutation of Xyl repressor from Bacillus subtilis is trans dominant in Bacillus megaterium. FEMS Microbiol Lett 1993; 109:81-4. [PMID: 8319885 DOI: 10.1111/j.1574-6968.1993.tb06147.x] [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] [Subscribe] [Scholar Register] [Indexed: 01/29/2023] Open
Abstract
We have selected a Bacillus subtilis 168-borne xylR Ser to Leu mutation at position 41 of the encoded amino acid sequence showing a constitutive expression phenotype for the xyl operon. When cloned on a multi-copy plasmid in a B. megaterium strain harbouring a single-copy xylA-lacZ fusion it leads to derepression of beta-galactosidase expression. Thus, it is trans dominant over the endogenous xylR, indicating that Xyl repressor functions as a multimer. This result also supports the assumption that the mutation is in a putative alpha-helix-turn-alpha-helix operator binding motif of Xyl repressor.
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Affiliation(s)
- C Kauder
- Lehrstuhl für Mikrobiologie, Friedrich-Alexander Universität Erlangen-Nürnberg, FRG
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Gärtner D, Degenkolb J, Ripperger JA, Allmansberger R, Hillen W. Regulation of the Bacillus subtilis W23 xylose utilization operon: interaction of the Xyl repressor with the xyl operator and the inducer xylose. Mol Gen Genet 1992; 232:415-22. [PMID: 1588910 DOI: 10.1007/bf00266245] [Citation(s) in RCA: 50] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
A crude protein extract of Bacillus subtilis W23 contains a sequence-specific DNA binding activity for the xyl operator as detected by the gel mobility shift assay. A xylR determinant encoded on a multicopy plasmid leads to increased expression of this binding activity. In situ footprinting analysis of the protein-DNA complex in a polyacrylamide gel shows that the xyl operator is sequence-specifically bound and protected from cleavage by copper-phenanthroline at 26 phosphodiester bonds on each strand. Quantitative competition assays for repressor binding reveal that a 25 bp synthetic xyl operator cloned into a polylinker is bound with the same affinity as the operator in the wild-type xyl regulatory region. This confirms that no additional sites in the wild-type sequence contribute to repressor binding. The xyl operator consists of ten palindromic base pairs flanking five central non-palindromic base pairs. A mutational analysis shows that the sequence of the central base pairs contributes to recognition by the repressor protein and that the spacing of the palindromic elements is crucial for repressor binding. An operator half site is not bound by the repressor. In vivo and in vitro induction studies suggest that, of several structurally similar sugars, xylose is the only molecular inducer of the Xyl repressor.
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Affiliation(s)
- D Gärtner
- Lehrstuhl für Mikrobiologie, Friedrich-Alexander Universität Erlangen-Nürnberg, FRG
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Jacob S, Allmansberger R, Gärtner D, Hillen W. Catabolite repression of the operon for xylose utilization from Bacillus subtilis W23 is mediated at the level of transcription and depends on a cis site in the xylA reading frame. Mol Gen Genet 1991; 229:189-96. [PMID: 1921970 DOI: 10.1007/bf00272155] [Citation(s) in RCA: 61] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
The Bacillus subtilis xyl operon encoding enzymes for xylose utilization is repressed in the absence of xylose and in the presence of glucose. Transcriptional fusions of spoVG-lacZ to this operon show regulation of beta-galactosidase expression by glucose, indicating that glucose repression operates at the level of transcription. A similar result is obtained when glucose is replaced by glycerol, thus defining a general catabolite repression mechanism. A deletion of xylR, which encodes the xylose-sensitive repressor of the operon, does not affect glucose repression. The cis element mediating glucose repression was identified by Bal31 deletion analysis. It is confined to a 34 bp segment located at position +125 downstream of the xyl promoter in the coding sequence for xylose isomerase. Cloning of this segment in the opposite orientation leads to reduced catabolite repression. The homology of this element to various proposed consensus sequences for catabolite repression in B. subtilis is discussed.
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Affiliation(s)
- S Jacob
- Institut für Mikrobiologie und Biochemie, Friedrich-Alexander Universität Erlangen-Nürnberg, Federal Republic of Germany
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Abstract
The xyl operator of Bacillus subtilis W23 was identified by deletion analysis of the xyl regulatory region as a 25-base-pair (bp) sequence located 10 bp downstream from the xyl promoter. The outer 10 bp of the xyl operator exhibit perfect palindromic symmetry, while 5 central bp are nonpalindromic. It was demonstrated that the penultimate base pair near the end of this sequence is important for repressor binding. The location of the xylR gene encoding the repressor was determined by its ability to mediate xylose-dependent repression of a xyl-cat fusion on a multicopy plasmid. The nucleotide sequence of 1,355 bp from this DNA was analyzed and contains an open reading frame with a coding capacity for 384 amino acids leading to a protein with a calculated molecular weight of 42,270. A mutant with a deletion in this reading frame showed no repression of the xyl-cat fusion. The coding sequence is preceded by a suitable ribosome-binding sequence and uses GTG as a start codon and TAA as a stop codon. The relationship of these results to corresponding data obtained from B. subtilis 168 is discussed.
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Affiliation(s)
- P Kreuzer
- Lehrstuhl für Mikrobiologie, Friedrich Alexander Universität Erlangen-Nürnberg, Federal Republic of Germany
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Gärtner D, Geissendörfer M, Hillen W. Expression of the Bacillus subtilis xyl operon is repressed at the level of transcription and is induced by xylose. J Bacteriol 1988; 170:3102-9. [PMID: 2454911 PMCID: PMC211255 DOI: 10.1128/jb.170.7.3102-3109.1988] [Citation(s) in RCA: 90] [Impact Index Per Article: 2.5] [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: 01/01/2023] Open
Abstract
Expression of xylose isomerase was repressed in Bacillus subtilis strains W23, 168, and BR151 and could be induced in the presence of xylose. The expression was also glucose repressed in strains 168 and BR151, although this effect was not observed with W23. A xyl-cat fusion gene was constructed on a multicopy plasmid, from which the xyl promoter located on a 366-base-pair (bp) DNA fragment derived from W23 directed the expression of chloramphenicol resistance. The regulation of expression was not very pronounced in this multicopy situation. The xyl promoter is a strong signal for transcription initiation. The 5' sequence of the xyl mRNA was identified by nuclease S1 mapping. The promoter consisted of the -10 sequence TAAGAT, the -35 sequence TTGAAA spaced by 17 bp, and an upstream poly(A) block with 14 As out of 17 bp. To study the regulation, a xyl-lacZ fusion gene was constructed and integrated as a single copy into the amygene of B. subtilis 168. This strain grows blue on X-Gal (5-bromo-4-chloro-3-indolyl-beta-D-galactoside) indicator plates in the presence of xylose and white in the presence of glucose. Quantitatively, the induction of beta-galactosidase by xylose was 100-fold. In the presence of xylose plus glucose, the expression of the indicator gene was repressed to 30% of the fully induced level. About 25 to 60% of the maximal lacZ expression was obtained with this strain when the 366-bp xyl DNA fragment was provided in trans on a multicopy plasmid. This result indicates that repression in the absence of xylose is mediated in trans by a soluble factor which is expressed at a low level in B. subtilis 168. The xylose effect depended on negative regulation. The estimations of mRNA amounts by dot blot analysis showed unambiguously that the induction by xylose occurs at the level of transcription. The possible molecular mechanisms are discussed with respect to the nucleotide sequence of the 366-bp xyl regulatory DNA.
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Affiliation(s)
- D Gärtner
- Lehrstuhl für Mikrobiologie, Friedrich-Alexander Universität Erlangen-Nürnberg, Federal Republic of Germany
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Schollmeier K, Gärtner D, Hillen W. A bidirectionally active signal for termination of transcription is located between tetA and orfL on transposon Tn10. Nucleic Acids Res 1985; 13:4227-37. [PMID: 2989790 PMCID: PMC321784 DOI: 10.1093/nar/13.12.4227] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
Abstract
A terminator of transcription with bidirectional activity has been located between the translation termination codons of the genes tetA and orfL on Tn10. These genes are transcribed towards each other. Each orientation of the intervening sequence is shown to reduce the expression of the lacZ and galK genes when cloned between the respective structural gene and its promotor. The 3'ends of the respective mRNAs were determined by S1 mapping. The results confirm that the same sequence capable of forming a stem-loop structure with a GC rich stem is the termination signal for both orientations. In the more efficient tetA orientation (99%-96% reduction of expression) this sequence is followed by a run of six thymines. In the less efficient orfL orientation (96%-78% reduction of expression) it is followed by an AT rich sequence with seven thymines out of eleven base pairs.
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Abstract
A pilotstudy was undertaken to evaluate the utilisation of modified computed tomography as an early diagnostic means to confirm the loosening of the total hip endoprosthesis. In nine of the twelve cases the CT investigation clearly indicated the loosening of the endoprosthesis. With respect to the remaining three patients, no conclusions could be drawn because of the presence of artifacts. It is of further interest to note pertaining to these three, that two had been supplied with an endoprosthesis of the hip on both sides and the third with an irregular surfaced shaft endoprosthesis. In conclusions one can say, despite the problems associated with the modified CT, that it is a suitable additional method for the early diagnosis of the loosening of total hip endoprosthesis.
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