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Chen HY, Lin SY, Shih JC, Kang J, Tai YY, Shaw SW, Chen KC, Mai K, Lee CN. Changing the standardised obstetric care by expanded carrier screening and counselling: a multicentre prospective cohort study. J Med Genet 2024; 61:176-181. [PMID: 37798098 DOI: 10.1136/jmg-2023-109268] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2023] [Accepted: 09/05/2023] [Indexed: 10/07/2023]
Abstract
BACKGROUND Expanded genetic screening before conception or during prenatal care can provide a more comprehensive evaluation of heritable fetal diseases. This study aimed to provide a large cohort to evaluate the significance of expanded carrier screening and to consolidate the role of expanded genetic screening in prenatal care. METHODS This multicentre, retrospective cohort study was conducted between 31 December 2019 and 21 July 2022. A screening panel containing 302 genes and next-generation sequencing were used for the evaluation. The patients were referred from obstetric clinics, infertility centres and medical centres. Genetic counsellors conducted consultation for at least 15 min before and after screening. RESULTS A total of 1587 patients were screened, and 653 pairs were identified. Among the couples who underwent the screening, 62 (9.49%) had pathogenic variants detected on the same genes. In total, 212 pathogenic genes were identified in this study. A total of 1173 participants carried at least one mutated gene, with a positive screening rate of 73.91%. Among the pathogenic variants that were screened, the gene encoding gap junction beta-2 (GJB2) exhibited the highest prevalence, amounting to 19.85%. CONCLUSION Next-generation sequencing carrier screening provided additional information that may alter prenatal obstetric care by 9.49%. Pan-ethnic genetic screening and counselling should be suggested for couples of fertile age.
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Affiliation(s)
- Han-Ying Chen
- Department of Obstetrics and Gynecology, National Taiwan University Hospital, Taipei, Taiwan
- Program for Precision Health and Intelligent Medicine, Graduate School of Advanced Technology, National Taiwan University, Taipei, Taiwan
| | - Shin-Yu Lin
- Department of Obstetrics and Gynecology, National Taiwan University Hospital, Taipei, Taiwan
| | - Jin-Chung Shih
- Department of Obstetrics and Gynecology, National Taiwan University Hospital, Taipei, Taiwan
| | - Jessica Kang
- Department of Obstetrics and Gynecology, National Taiwan University Hospital, Taipei, Taiwan
| | - Yi-Yun Tai
- Department of Medical Genetics, National Taiwan University Hospital, Taipei, Taiwan
| | - Steven W Shaw
- Department of Obstetrics and Gynecology, Taipei Chang Gung Memorial Hospital, Taipei, Taiwan
- College of Medicine, Chang Gung University, Taoyuan, Taiwan
| | - Kuang-Cheng Chen
- College of Osteopathic Medicine of the Pacific, Western University of Health Sciences, Pomona, California, USA
| | - Kevin Mai
- College of Osteopathic Medicine of the Pacific, Western University of Health Sciences, Pomona, California, USA
| | - Chien-Nan Lee
- Department of Obstetrics and Gynecology, National Taiwan University Hospital, Taipei, Taiwan
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Bhar S, Yoon CS, Mai K, Han J, Prajapati DV, Wang Y, Steffen CL, Bailey LS, Basso KB, Butcher RA. An acyl-CoA thioesterase is essential for the biosynthesis of a key dauer pheromone in C. elegans. Cell Chem Biol 2024:S2451-9456(23)00437-3. [PMID: 38183989 DOI: 10.1016/j.chembiol.2023.12.006] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2023] [Revised: 09/02/2023] [Accepted: 12/10/2023] [Indexed: 01/08/2024]
Abstract
Methyl ketone (MK)-ascarosides represent essential components of several pheromones in Caenorhabditis elegans, including the dauer pheromone, which triggers the stress-resistant dauer larval stage, and the male-attracting sex pheromone. Here, we identify an acyl-CoA thioesterase, ACOT-15, that is required for the biosynthesis of MK-ascarosides. We propose a model in which ACOT-15 hydrolyzes the β-keto acyl-CoA side chain of an ascaroside intermediate during β-oxidation, leading to decarboxylation and formation of the MK. Using comparative metabolomics, we identify additional ACOT-15-dependent metabolites, including an unusual piperidyl-modified ascaroside, reminiscent of the alkaloid pelletierine. The β-keto acid generated by ACOT-15 likely couples to 1-piperideine to produce the piperidyl ascaroside, which is much less dauer-inducing than the dauer pheromone, asc-C6-MK (ascr#2, 1). The bacterial food provided influences production of the piperidyl ascaroside by the worm. Our work shows how the biosynthesis of MK- and piperidyl ascarosides intersect and how bacterial food may impact chemical signaling in the worm.
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Affiliation(s)
- Subhradeep Bhar
- Department of Chemistry, University of Florida, Gainesville, FL 32611, USA
| | - Chi-Su Yoon
- Department of Chemistry, University of Florida, Gainesville, FL 32611, USA
| | - Kevin Mai
- Department of Chemistry, University of Florida, Gainesville, FL 32611, USA
| | - Jungsoo Han
- Department of Chemistry, University of Florida, Gainesville, FL 32611, USA
| | - Dilip V Prajapati
- Department of Chemistry, University of Florida, Gainesville, FL 32611, USA
| | - Yuting Wang
- Department of Chemistry, University of Florida, Gainesville, FL 32611, USA
| | - Candy L Steffen
- Department of Chemistry, University of Florida, Gainesville, FL 32611, USA
| | - Laura S Bailey
- Department of Chemistry, University of Florida, Gainesville, FL 32611, USA
| | - Kari B Basso
- Department of Chemistry, University of Florida, Gainesville, FL 32611, USA
| | - Rebecca A Butcher
- Department of Chemistry, University of Florida, Gainesville, FL 32611, USA.
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Mai K, Maverakis E, Li J, Zhao M. Maintaining and Restoring Gradients of Ions in the Epidermis: The Role of Ion and Water Channels in Acute Cutaneous Wound Healing. Adv Wound Care (New Rochelle) 2023; 12:696-709. [PMID: 37051706 PMCID: PMC10615091 DOI: 10.1089/wound.2022.0128] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2022] [Accepted: 04/09/2023] [Indexed: 04/14/2023] Open
Abstract
Significance: Aquaporins and ion channels establish and regulate gradients of calcium, sodium, potassium, chloride, water, and protons in the epidermis. These elements have been found to play significant roles in skin biology and wound healing. In this study, we review our understanding of these channels and ion gradients, with a special emphasis on their role in acute wound healing. Recent Advances: Specifically, we assess the temporal and spatial arrangements of ions and their respective channels in the intact skin and during wound and healing to provide a novel perspective of the role of ionic gradients through the various stages of wound healing. Critical Issues: The roles of gradients of ions and channels in wound healing are currently not well understood. A collective analysis of their traits and arrangements in the skin during wound healing may provide a new perspective and understanding of the functionality of gradients of ions and channels in skin biology and wound healing. Future Directions: It is important to elucidate how the gradients of ions and ion channels regulate and facilitate wound healing. A better understanding of the ionic environments may identify novel therapeutic targets and improved strategies to promote wound healing and possibly treat other cutaneous diseases.
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Affiliation(s)
- Kevin Mai
- College of Osteopathic Medicine of the Pacific, Western University of Health Sciences, Pomona, California, USA
| | - Emanual Maverakis
- Department of Dermatology, University of California, Davis, Sacramento, California, USA
| | - Jung Li
- Des Moines University College of Osteopathic Medicine, Des Moines, Iowa, USA
| | - Min Zhao
- Department of Dermatology, University of California, Davis, Sacramento, California, USA
- Department of Ophthalmology & Vision Science, University of California, Davis, Sacramento, California, USA
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Remde H, Schmidt-Pennington L, Reuter M, Landwehr LS, Jensen M, Lahner H, Kimpel O, Altieri B, Laubner K, Schreiner J, Bojunga J, Kircher S, Kunze CA, Pohrt A, Teleanu MV, Hübschmann D, Stenzinger A, Glimm H, Fröhling S, Fassnacht M, Mai K, Kroiss M. Outcome of Immunotherapy in Adrenocortical Carcinoma - A retrospective cohort study. Eur J Endocrinol 2023:7187724. [PMID: 37260092 DOI: 10.1093/ejendo/lvad054] [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] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/18/2022] [Revised: 03/13/2023] [Accepted: 04/18/2023] [Indexed: 06/02/2023]
Abstract
OBJECTIVE Clinical trials with immune checkpoint inhibitors (ICI) in adrenocortical carcinoma (ACC) have yielded contradictory results. We aimed to evaluate treatment response and safety of ICI in ACC in a real-life setting. DESIGN Retrospective cohort study of 54 patients with advanced ACC receiving ICI as compassionate use at six German reference centres between 2016 and 2022. METHODS Objective response rate (ORR), disease control rate (DCR), progression-free survival (PFS), overall survival (OS) and treatment-related adverse events (TRAE) were assessed. RESULTS In 52 patients surviving at least 4 weeks after initiation of ICI, ORR was 13.5% (6-26) and DCR 24% (16-41). PFS was 3.0 months (95%CI 2.3-3.7). In all patients, median OS was 10.4 months (3.8-17). 17 TRAE occurred in 15 patients, which was associated with a longer PFS of 5.5 (1.9-9.2) vs. 2.5 (2.0- 3.0) months (HR 0.29, 95%CI 0.13-0.66, p=0.001) and OS of 28.2 (9.5-46.8) vs. 7.0 (4.1-10.2) months (HR 0.34, 95%CI 0.12-0.93). Positive tissue staining for programmed cell death ligand 1 (PD-L1) was associated with a longer PFS of 3.2 (2.6-3.8) vs. 2.3 (1.6-3.0, p<0.05) months. Adjusted for concomitant mitotane use, treatment with nivolumab was associated with lower risk of progression (HR 0.36, 0.15-0.90) and death (HR 0.20, 0.06-0.72) compared to pembrolizumab. CONCLUSIONS In the real-life setting we observe a response comparable to other second-line therapies and an acceptable safety profile in ACC patients receiving different ICI. The relevance of PD-L1 as a marker of response and the potentially more favourable outcome in nivolumab treated patients require confirmation.
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Affiliation(s)
- H Remde
- Department of Internal Medicine I, Division of Endocrinology and Diabetes, University Hospital, University of Würzburg, Würzburg, Germany
| | - L Schmidt-Pennington
- Department of Endocrinology & Metabolism, Charité - Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Insitute of Health, 10117 Berlin, Germany
| | - M Reuter
- Department of Internal Medicine I, Division of Endocrinology and Diabetes, University Hospital, University of Würzburg, Würzburg, Germany
| | - L-S Landwehr
- Department of Internal Medicine I, Division of Endocrinology and Diabetes, University Hospital, University of Würzburg, Würzburg, Germany
| | - M Jensen
- Department of Endocrinology & Metabolism, Charité - Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Insitute of Health, 10117 Berlin, Germany
| | - H Lahner
- Department of Endocrinology and Metabolism, University Hospital Duisburg-Essen, Essen, Germany
| | - O Kimpel
- Department of Internal Medicine I, Division of Endocrinology and Diabetes, University Hospital, University of Würzburg, Würzburg, Germany
| | - B Altieri
- Department of Internal Medicine I, Division of Endocrinology and Diabetes, University Hospital, University of Würzburg, Würzburg, Germany
| | - K Laubner
- Division of Endocrinology and Diabetology, Department of Medicine II, Faculty of Medicine, Medical Center University of Freiburg, University of Freiburg
| | - J Schreiner
- University Hospital Munich, Department of Internal Medicine IV, Ludwig-Maximilians-University München, Munich, Germany
| | - J Bojunga
- Department of Internal Medicine 1, Division of Endocrinology, Goethe University Frankfurt, Faculty 16 Medicine, Frankfurt am Main, Germany
| | - S Kircher
- Institute of Pathology, University of Würzburg, Würzburg, Germany
| | - C A Kunze
- Institute of Pathology, Charité - Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Berlin, Germany
| | - A Pohrt
- Institute of Biometry and Clinical Epidemiology, Charité - Universitätsmedizin Berlin, Berlin, Germany
| | - M V Teleanu
- National Center for Tumor Diseases Heidelberg and German Cancer Research Center, Im Neuenheimer Feld 460, 69120 Heidelberg, Germany
| | - D Hübschmann
- Computational Oncology Group, Molecular Precision Oncology Program, National Center for Tumor Diseases (NCT) Heidelberg and German Cancer Research Center (DKFZ) Heidelberg, Germany
- Pattern Recognition and Digital Medicine Group, Heidelberg Institute for Stem cell Technology and Experimental Medicine (HI-STEM) gGmbH, Heidelberg, Germany
- German Cancer Consortium, Im Neuenheimer Feld 280, 69120 Heidelberg Germany
| | - A Stenzinger
- Universitätsklinikum Heidelberg, Institut für Pathologie, Im Neuenheimer Feld 224, 69120 Heidelberg
| | - H Glimm
- Department for Translational Medical Oncology, National Center for Tumor Diseases (NCT/UCC), Dresden, Germany
- Translational Medical Oncology, Faculty of Medicine and University Hospital Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany
- Translational Functional Cancer Genomics, National Center for Tumor Diseases (NCT) and German Cancer Research Center (DKFZ), Heidelberg, Germany
- German Cancer Consortium (DKTK) Dresden, Germany
| | - S Fröhling
- National Center for Tumor Diseases Heidelberg and German Cancer Research Center, Im Neuenheimer Feld 460, 69120 Heidelberg, Germany
- German Cancer Consortium, Im Neuenheimer Feld 280, 69120 Heidelberg Germany
| | - M Fassnacht
- Department of Internal Medicine I, Division of Endocrinology and Diabetes, University Hospital, University of Würzburg, Würzburg, Germany
- Comprehensive Cancer Center Mainfranken, University of Würzburg, Würzburg, Germany
| | - K Mai
- Department of Endocrinology & Metabolism, Charité - Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Insitute of Health, 10117 Berlin, Germany
| | - M Kroiss
- Department of Internal Medicine I, Division of Endocrinology and Diabetes, University Hospital, University of Würzburg, Würzburg, Germany
- University Hospital Munich, Department of Internal Medicine IV, Ludwig-Maximilians-University München, Munich, Germany
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Zhao L, Zhou J, Chen J, Zhang X, Zhang H, Guo L, Li D, Ning J, Wang X, Jin W, Mai K, Abraham E, Butcher R, Sun J. A chemical signal that promotes insect survival via thermogenesis. Res Sq 2023:rs.3.rs-2756320. [PMID: 37214941 PMCID: PMC10197781 DOI: 10.21203/rs.3.rs-2756320/v1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Cold-activated thermogenesis of brown adipose tissues (BAT) is vital for the survival of animals under cold stress and also inhibits the development of tumours. The development of small-molecule tools that target thermogenesis pathways could lead to novel therapies against cold, obesity, and even cancer. Here, we identify a chemical signal that is produced in beetles in the winter to activate fat thermogenesis. This hormone elevates the basal body temperature by increasing cellular mitochondrial density and uncoupling in order to promote beetle survival. We demonstrate that this hormone activates UCP4- mediated uncoupled respiration through adipokinetic hormone receptor (AKHR). This signal serves as a novel fat-burning activator that utilizes a conserved mechanism to promote thermogenesis not only in beetles, nematode and flies, but also in mice, protecting the mice against cold and tumor growth. This hormone represents a new strategy to manipulate fat thermogenesis.
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Affiliation(s)
- Lilin Zhao
- Institute of Zoology, Chinese Academy of Sciences
| | - Jiao Zhou
- Institute of Zoology, Chinese Academy of Sciences
| | - Junxian Chen
- Institute of Zoology, Chinese Academy of Sciences
| | | | | | | | - Defeng Li
- Institute of Microbiology, Chinese Academy of Sciences
| | - Jing Ning
- Institute of Zoology, Chinese Academy of Sciences
| | - Xinchen Wang
- Institute of Zoology, Chinese Academy of Sciences
| | - Wanzhu Jin
- Institute of Zoology, Chinese Academy of Sciences
| | - Kevin Mai
- Department of Chemistry, University of Florida
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Mai K, Adams D. 002 Shiitake dermatitis: Not mush-room for shrooms. J Invest Dermatol 2022. [DOI: 10.1016/j.jid.2022.05.056] [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: 11/27/2022]
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Noh S, Mai K, Shaver M, Yong S, Mostaghimi M, Oh G, Radwan MM. Emerging Cholesterol Modulators for Atherosclerotic Cardiovascular Disease. Am J Med Sci 2022; 363:373-387. [DOI: 10.1016/j.amjms.2021.12.011] [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] [Received: 01/18/2021] [Revised: 08/07/2021] [Accepted: 12/07/2021] [Indexed: 12/01/2022]
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Walton WE, Mai K, Nguyen A, Tse R. Evaluation of Two Management Strategies for Harvested Emergent Vegetation on Immature Mosquito Abundance and Water Quality. J Am Mosq Control Assoc 2020; 36:139-151. [PMID: 33600584 DOI: 10.2987/20-6913.1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Emergent macrophytes play critical roles in water treatment processes of free-water surface constructed treatment wetlands. Management strategies for plant biomass affect wetland function and mosquito populations. Sinking of harvested macrophyte biomass is thought to provide organic carbon that enhances denitrifying bacteria important for nutrient removal while concomitantly reducing harborage for mosquitoes. The effects of sinking versus floating dried plant biomass (California bulrush [Schoenoplectus californicus]) on immature mosquito abundance and water quality (nutrient levels, oxygen demand, and physicochemical variables) were examined in mesocosms (28-m2 ponds or 1.4-m2 wading pools) under different flow regimes in 4 studies. The numbers of mosquito larvae in earthen ponds with floating vegetation were greater than in ponds with sunken vegetation on most dates but did not differ significantly between the 2 vegetation treatments in experiments using wading pools. Differences of the abundance of Anopheles larvae between the 2 vegetation management treatments were larger than for Culex larvae when naturally occurring larval mosquito predators were present. At high turnover rates (>2 pond volumes/day), water quality did not differ significantly between the vegetation management treatments and the water supply. At low turnover rates (approximately 2-6% of water volume/day), water quality differed significantly between the 2 vegetation management treatments and the water supply. Sinking vegetation can enhance the effectiveness of mosquito control but, depending on water management practices, may raise the concentrations of water quality constituents in discharges that are regulated under the Clean Water Act.
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Faghih N, Bhar S, Zhou Y, Dar AR, Mai K, Bailey LS, Basso KB, Butcher RA. A Large Family of Enzymes Responsible for the Modular Architecture of Nematode Pheromones. J Am Chem Soc 2020; 142:13645-13650. [PMID: 32702987 DOI: 10.1021/jacs.0c04223] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
The nematode Caenorhabditis elegans produces a broad family of pheromones, known as the ascarosides, that are modified with a variety of groups derived from primary metabolism. These modifications are essential for the diverse activities of the ascarosides in development and various behaviors, including attraction, aggregation, avoidance, and foraging. The mechanism by which these different groups are added to the ascarosides is poorly understood. Here, we identify a family of over 30 enzymes, which are homologous to mammalian carboxylesterase (CES) enzymes, and show that a number of these enzymes are responsible for the selective addition of specific modifications to the ascarosides. Through stable isotope feeding experiments, we demonstrate the in vivo activity of the CES-like enzymes and provide direct evidence that the acyl-CoA synthetase ACS-7, which was previously implicated in the attachment of certain modifications to the ascarosides in C. elegans, instead activates the side chains of certain ascarosides for shortening through β-oxidation. Our data provide a key to the combinatorial logic that gives rise to different modified ascarosides, which should greatly facilitate the exploration of the specific biological functions of these pheromones in the worm.
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Affiliation(s)
- Nasser Faghih
- Department of Chemistry, University of Florida, Gainesville, Florida, United States
| | - Subhradeep Bhar
- Department of Chemistry, University of Florida, Gainesville, Florida, United States
| | - Yue Zhou
- Department of Chemistry, University of Florida, Gainesville, Florida, United States
| | - Abdul Rouf Dar
- Department of Chemistry, University of Florida, Gainesville, Florida, United States
| | - Kevin Mai
- Department of Chemistry, University of Florida, Gainesville, Florida, United States
| | - Laura S Bailey
- Department of Chemistry, University of Florida, Gainesville, Florida, United States
| | - Kari B Basso
- Department of Chemistry, University of Florida, Gainesville, Florida, United States
| | - Rebecca A Butcher
- Department of Chemistry, University of Florida, Gainesville, Florida, United States
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Mai K. So nehmen ältere Frauen besser ab. MMW Fortschr Med 2020; 162:24-25. [PMID: 32291674 DOI: 10.1007/s15006-020-0377-z] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Mai K. Diätpulver-Drinks gegen Diabetiker-Pfunde. MMW Fortschr Med 2020; 162:29. [PMID: 31960310 DOI: 10.1007/s15006-020-0054-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Li L, Decker AM, Jumpertz-von Schwarzenberg R, Leupelt V, Spranger J, Mai K. Prediction of long-term improvement of insulin sensitivity after weight loss by adipose tissue ANP system and modification by a 12-months weight maintenance intervention: A randomized controlled trial. DIABETOL STOFFWECHS 2018. [DOI: 10.1055/s-0038-1641764] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Affiliation(s)
- L Li
- Charité Universitätsmedizin Berlin, Medizinische Klinik für Endokrinologie, Diabetes und Ernährungsmedizin, Berlin, Germany
- Berlin Institute of Health, Berlin, Germany
| | - AM Decker
- Charité Universitätsmedizin Berlin, Medizinische Klinik für Endokrinologie, Diabetes und Ernährungsmedizin, Berlin, Germany
| | - R Jumpertz-von Schwarzenberg
- Charité Universitätsmedizin Berlin, Medizinische Klinik für Endokrinologie, Diabetes und Ernährungsmedizin, Berlin, Germany
| | - V Leupelt
- Charité Universitätsmedizin Berlin, Medizinische Klinik für Endokrinologie, Diabetes und Ernährungsmedizin, Berlin, Germany
| | - J Spranger
- Charité Universitätsmedizin Berlin, Medizinische Klinik für Endokrinologie, Diabetes und Ernährungsmedizin, Berlin, Germany
- Berlin Institute of Health, Berlin, Germany
| | - K Mai
- Charité Universitätsmedizin Berlin, Medizinische Klinik für Endokrinologie, Diabetes und Ernährungsmedizin, Berlin, Germany
- Berlin Institute of Health, Berlin, Germany
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Wollersheim T, Frank S, Müller M, Skrypnikov V, Carbon N, Pickerodt P, Spies C, Mai K, Spranger J, Weber-Carstens S. Measuring Energy Expenditure in extracorporeal lung support Patients (MEEP) – Protocol, feasibility and pilot trial. Clin Nutr 2018; 37:301-307. [DOI: 10.1016/j.clnu.2017.01.001] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2016] [Revised: 12/20/2016] [Accepted: 01/05/2017] [Indexed: 01/15/2023]
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Mai K, Feng J, Chen G, Li D, Zhou L, Bai Y, Wu Q, Ma J. The detection and phylogenetic analysis of porcine deltacoronavirus from Guangdong Province in Southern China. Transbound Emerg Dis 2017; 65:166-173. [PMID: 28345292 PMCID: PMC7169752 DOI: 10.1111/tbed.12644] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2016] [Indexed: 11/29/2022]
Abstract
Porcine deltacoronavirus (PDCoV) is a newly discovered coronavirus that causes diarrhoea, vomiting and dehydration in sucking and nursing piglets. It was first reported in Hong Kong in 2012 and has since been discovered in the United States, Canada, South Korea, mainland China, Thailand and Laos. PDCoV has been experimentally proved to lead to diarrhoea in swine and it was detected positive in pigs in Guangdong, southern China. In our study, 252 faecal and intestinal samples from sucking piglets and sows with diarrhoea were surveyed for common enteric viruses. We found a prevalence of PDCoV (21.8%), porcine epidemic diarrhoea virus (65.5%), transmissible gastroenteritis virus (0%), rotavirus group A (25.0%) and porcine kobuvirus (68.7%). We isolated 13 PDCoV strains and discovered that PDCoV infections were often co‐infections with kobuvirus rather than the commonly linked porcine epidemic diarrhoea virus. Phylogenetic analysis of S gene and N gene revealed that 11 of 13 PDCoV strains belonged to Chinese lineage. As for the left two strains, one single strain (CHN‐GD16‐05) belonged to American and Korean lineages while another strain (CHN‐GD16‐03) was similar to a Thai strain, but only in the S gene. This suggested a possible recombination event between the Thai and the newly described Chinese strain.
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Affiliation(s)
- K Mai
- College of Animal Science, South China Agricultural University, Guangzhou, China
| | - J Feng
- College of Animal Science, South China Agricultural University, Guangzhou, China
| | - G Chen
- College of Animal Science, South China Agricultural University, Guangzhou, China
| | - D Li
- College of Animal Science, South China Agricultural University, Guangzhou, China
| | - L Zhou
- College of Animal Science, South China Agricultural University, Guangzhou, China
| | - Y Bai
- College of Animal Science, South China Agricultural University, Guangzhou, China
| | - Q Wu
- College of Animal Science, South China Agricultural University, Guangzhou, China
| | - J Ma
- College of Animal Science, South China Agricultural University, Guangzhou, China
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Fischer-Rosinský A, Schloecker M, Decker AM, Meinus S, Spranger J, Mai K. Parameter of glucose metabolism and glucocorticoidal genes from two different human fat depots. DIABETOL STOFFWECHS 2016. [DOI: 10.1055/s-0036-1580820] [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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Koch S, Wollersheim T, Mai K, Haas K, Spies C, Grosskreutz J, Weber-Carstens S. Relation of Resting Membrane Polarization and Insulin Resistance in Critically Ill Patients. Intensive Care Med Exp 2015. [PMCID: PMC4796152 DOI: 10.1186/2197-425x-3-s1-a520] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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Engelhardt L, Wollersheim T, Pachulla J, Mörgeli R, Balzer F, Mai K, Weber-Carstens S. Accuracy of a subcutaneous continuous glucose management system in critically ill patients. Intensive Care Med Exp 2015. [PMCID: PMC4797470 DOI: 10.1186/2197-425x-3-s1-a291] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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Ebinger M, Ipsen N, Leonards CO, Empl L, Hanne L, Liman T, Mai K, Strasburger CJ, Spranger J, Endres M. Circulating insulin-like growth factor binding protein-3 predicts one-year outcome after ischemic stroke. Exp Clin Endocrinol Diabetes 2015; 123:461-5. [PMID: 26069074 DOI: 10.1055/s-0035-1554632] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
BACKGROUND Insulin-like Growth Factor-1 (IGF-1) and Insulin-like Growth Factor Binding Protein-3 (IGFBP-3) have been ascribed neuroprotective effects. We sought to determine whether levels of IGF-1 and IGFBP-3 predict functional outcome after ischemic stroke. METHODS IGF-1 and IGFBP-3 levels were measured in the first week after stroke in patients with first ischemic stroke who were enrolled in the Berlin Cream&Sugar Study. National Institutes of Health Stroke Scale (NIHSS) was collected at admission. Lesion volume was determined from acute MRI if available. Functional outcome according to the modified Rankin Scale (mRS) was assessed after one year. In multivariate analyses we identified parameters associated with unfavourable functional outcome (mRS>2). RESULTS We included 100 patients. 21 patients had an unfavourable functional outcome. IGF-1 levels were<- 2 standard deviation score (SDS) in 7 patients, and>2 SDS in 12 patients. IGFBP-3 levels were<the 5(th) percentile in 13 patients, and no patient had IGFBP-3 levels>the 95(th) percentile. Low levels of IGFBP-3 (p=0.002), NIHSS at admission (p=0.043) and age (p=0.001) were associated with unfavourable functional outcome in the univariate analyses. In multivariate analysis including IGFBP-3, IGF-1, age, thrombolysis and NIHSS only low IGFBP-3 levels (OR 7.2, 95%CI 1.8-29.0, p=0.006) were associated with unfavourable functional outcome. If lesion volume was incuded (n=71), only IGFBP-3 levels (OR 7.2, 95%CI 1.5-35.5, p=0.015) were associated with unfavourable functional outcome. CONCLUSION IGFBP-3 levels after ischemic stroke may independently predict functional outcome after one year.
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Affiliation(s)
- M Ebinger
- Department of Neurology, Charité - Universitätsmedizin Berlin, Germany
| | - N Ipsen
- Department of Neurology, Charité - Universitätsmedizin Berlin, Germany
| | - C O Leonards
- Center for Stroke Research Berlin, Charité - Universitätsmedizin Berlin, Germany
| | - L Empl
- International Graduate Program Medical Neurosciences, Charité - Universitätsmedizin Berlin, Germany
| | - L Hanne
- Center for Stroke Research Berlin, Charité - Universitätsmedizin Berlin, Germany
| | - T Liman
- Center for Stroke Research Berlin, Charité - Universitätsmedizin Berlin, Germany
| | - K Mai
- Department of Endocrinology and Metabolism, Charité - Universitätsmedizin Berlin, Germany
| | - C J Strasburger
- Department of Endocrinology and Metabolism, Charité - Universitätsmedizin Berlin, Germany
| | - J Spranger
- Department of Endocrinology and Metabolism, Charité - Universitätsmedizin Berlin, Germany
| | - M Endres
- Department of Neurology, Charité - Universitätsmedizin Berlin, Germany
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Mai K. [Olive oil also helps control atrial fibrillation]. MMW Fortschr Med 2015; 157:43. [PMID: 26015204 DOI: 10.1007/s15006-015-2913-9] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
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Schlöcker M, Leupelt V, Hübner N, Robinson P, Spranger J, Mai K. Gene expression changes in human adipose tissue and effects on metabolic parameters. Exp Clin Endocrinol Diabetes 2015. [DOI: 10.1055/s-0035-1547765] [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: 10/23/2022]
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Mai K. [Mediterranean diet lowers diabetes risk]. MMW Fortschr Med 2014; 156:35. [PMID: 24930227] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
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Jumpertz-von Schwartzenberg R, Zeitz U, Hampel D, Boschmann M, Luft F, Spranger J, Mai K. Glucose regulation during weight loss under dissociation of negative energy balance and changed body composition: preliminary data from an ongoing randomized controlled trial. DIABETOL STOFFWECHS 2014. [DOI: 10.1055/s-0034-1375087] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [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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Jumpertz-von Schwartzenberg R, Zeitz U, Hampel D, Boschmann M, Spranger J, Mai K. Dissociating negative energy balance and body composition during and after weight loss. Exp Clin Endocrinol Diabetes 2014. [DOI: 10.1055/s-0034-1372123] [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: 10/25/2022]
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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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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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Bobbert T, Mai K, Brechtel L, Schulte HM, Weger B, Pfeiffer AFH, Spranger J, Diederich S. Leptin and endocrine parameters in marathon runners. Int J Sports Med 2012; 33:244-8. [PMID: 22261828 DOI: 10.1055/s-0031-1291251] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
Abstract
Endurance training may lead to different hormonal alterations e. g., exercised induced hypothalamic ovarian/testicular dysfunction. The aim of this study was to reveal new connections between physical exercise, leptin and hormonal responses. 36 male participants of the Berlin-Marathon had their blood samples taken 2 days before the marathon. Hormones of the hypothalamic-pituitary axis and leptin were correlated with the training status and the achieved marathon time. Leptin correlated with the achieved marathon time after being adjusted for age and BMI (r=0.607, p<0.001) and was lowest in the best trained runners. Additionally, when the group was divided into quartiles of their achieved marathon time, significantly increased cortisol, fT4, cortisol/DHEAS ratio and decreased IGF-1 levels were observed in the slowest group. In the better trained group, a decrease of testosterone/DHT ratio and an increase of testosterone/cortisol ratio were observed. Our study supports the thesis of a linear relationship between physical fitness and leptin variations in the physiological range. We found an increased anabolic hormonal response in well trained marathon runners and hormonal reactions of increased stress in less trained runners. As the stress-induced neuroendocrine adaptations in our study group are associated with more higher leptin values, the pathophysiological role of decreased leptin values seems to be limited to overtrained athletes.
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Affiliation(s)
- T Bobbert
- Charité, Department of Endocrinolgy, Diabetes and Nutrition, Berlin, Germany.
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Mai K, Meinus S, Assmann A, Bobbert T, Andres J, Biedasek K, Maser-Gluth C, Wudy S, Hartmann M, Pfeiffer A, Diederich S, Spranger J. Potential mechanism of rosiglitazone induced myocellular insulin sensitivity-effects of rosiglitazone on 11β-hydroxysteroid dehydrogenase type 1 expression in skeletal muscle. DIABETOL STOFFWECHS 2011. [DOI: 10.1055/s-0031-1277365] [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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Mai K, Reinecke F, Andres J, Bobbert T, Kraatz J, Wudy SA, Hartmann MF, Maser-Gluth C, Pfeiffer AFH, Spranger J. Effects of hyperlipidaemia on glucocorticoid metabolism: results of a randomized controlled trial in healthy young women. Clin Endocrinol (Oxf) 2011; 74:551-7. [PMID: 21470279 DOI: 10.1111/j.1365-2265.2011.03972.x] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
OBJECTIVE It is well established that the hypothalamic-pituitary-adrenal (HPA) axis is altered in obese individuals. Hyperlipidaemia with elevated levels of free fatty acids (FFAs) is also frequently seen in obesity and in the metabolic syndrome. We hypothesized, therefore, that hyperlipidaemia may alter the activity of the HPA axis. PATIENTS AND METHODS The effects of hyperlipidaemia, including increased circulating FFAs, on ACTH secretion and cortisol metabolism were analysed in 13 healthy young women during the early follicular phase of two subsequent cycles. We administered a 20% lipid/heparin (LHI) or a saline/heparin infusion (SHI) using a crossover design in random order for 330 min. A detailed characterization of glucocorticoid metabolism was performed by measurement of plasma ACTH, cortisol and urinary excretion rates of adrenal glucocorticoids and the glucocorticoid metabolites. RESULTS We observed that LHI-induced hyperlipidaemia elevated serum cortisol levels compared to SHI. No changes in plasma ACTH levels, daily urinary excretion rates of adrenal glucocorticoids, glucocorticoid precursors/metabolites and the calculated activities of the 5α-reductase, 3β-hydroxysteroid dehydrogenase (HSD), 11-, 17-, 21-hydroxylase and 11β-HSD 1 or 2 were found. CONCLUSION Our randomized controlled trial suggests that the adrenal sensitivity to ACTH may be enhanced by LHI-induced hyperlipidaemia in normal-weight healthy young women. This effect might contribute to the disturbances of the HPA axis described in women with abdominal obesity and impaired lipid metabolism.
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Affiliation(s)
- K Mai
- Department of Endocrinology, Diabetes and Nutrition, Charite - University Medicine Berlin, Campus Benjamin Franklin, Berlin, Germany.
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Diederich S, Quinkler M, Mai K, Schöneshöfer M, Baehr V, Pfeiffer A, Oelkers W, Eigendorff E. In vivo activity of 11β-hydroxysteroid dehydrogenase type 1 in man: effects of prednisolone and chenodesoxycholic acid. Horm Metab Res 2011; 43:66-71. [PMID: 20925019 DOI: 10.1055/s-0030-1267170] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [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: 10/19/2022]
Abstract
The 11β-hydroxysteroid dehydrogenases (11β-HSDs) play a pivotal role in glucocorticoid (GC) action. 11β-HSD1 is a predominant reductase, activating GCs from inert metabolites, whereas 11β-HSD2 is a potent dehydrogenase inactivating GCs. Knowing the metabolic effects of GCs, a selective inhibition of 11β-HSD1 represents a potential target for therapy of impaired glucose tolerance, insulin insensitivity and central obesity. In vitro, 11β-HSD1 is selectively inhibited by chenodesoxycholic acid (CDCA) and upregulated under GC exposure. Therefore, we aimed to investigate the effects of CDCA and prednisolone on hepatic 11β-HSD1 activity in vivo by measuring 11-reduction of orally given cortisone (E) acetate to cortisol (F). CDCA or placebo was given to 5 male healthy volunteers within a randomised cross-over trial before and after oral administration of 12.5 mg E acetate at 8:00 h. For measurement of in vivo effects of GCs on 11β-HSD1 activity, hepatic reduction of 25 mg E acetate before and after treatment with prednisolone (30 mg for 6 days) was determined in 7 healthy males. Serum GC levels were determined using a fully automated liquid chromatographic system. CDCA had no effect on the activity of 11β-HSD1 in vivo. Prednisolone therapy leads to a marked rise in serum F concentrations and an elevated F/E serum ratio. This proves GC-induced activation of hepatic 11β-HSD1, which could not be extinguished by a parallel increase of IGF-1 under prednisolone. CDCA does not affect in vivo activity of 11β-HSD1 when given in therapeutic dosages. During GC treatment, increased hepatic activation of E to F may aggravate metabolic side effects of GCs such as seen in the metabolic syndrome.
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Affiliation(s)
- S Diederich
- Department of Endocrinology, Diabetes and Nutrition, Charité Campus Benjamin Franklin, 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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Bobbert T, Raila J, Schwarz F, Mai K, Henze A, Pfeiffer AFH, Spranger J. Relation between the retinoid system and carotid intima media thickness. DIABETOL STOFFWECHS 2010. [DOI: 10.1055/s-0030-1253767] [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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Andres J, Gögebakan Ö, Biedasek K, Isken F, Mai K, Osterhoff M, Nauck M, Spranger J, Pfeiffer A. Glucose-abhängige insulinotrope Polypeptid (GIP) vermindert die Lipolyse in-vitro und in-vivo. DIABETOL STOFFWECHS 2010. [DOI: 10.1055/s-0030-1253781] [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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Bobbert T, Mai K, Groth C, Thurm U, Arafat AM, Pfeiffer AFH, Pani MA, Spranger J. Schnellere Stoffwechsel-Normalisierung durch Blutketon-Messung. DIABETOL STOFFWECHS 2009. [DOI: 10.1055/s-0029-1221909] [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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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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Andres J, Mai K, Pfeiffer AFH, Spranger J. Gesättigte Fettsäuren steigern die Promotoraktivität und mRNA-Expression der11beta-Hxdroxysteroid Dehydrogenase Typ 1. DIABETOL STOFFWECHS 2008. [DOI: 10.1055/s-2008-1076339] [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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Mai K, Andres J, Bobbert T, Pfeiffer AFH, Spranger J. Rosiglitazon vermindert die 11β-HSD1 Expression in humanem Sklettmuskel. DIABETOL STOFFWECHS 2008. [DOI: 10.1055/s-2008-1076337] [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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Diederich S, Mai K, Bähr V, Helffrich S, Pfeiffer A, Perschel FH. The Simultaneous Measurement of Plasma-Aldosterone- and -Renin-Concentration Allows Rapid Classification of all Disorders of the Renin-Aldosterone System. Exp Clin Endocrinol Diabetes 2007; 115:433-8. [PMID: 17647140 DOI: 10.1055/s-2007-973061] [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] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
OBJECTIVE The determination of the plasma aldosterone (PAC) to the plasma renin concentration (PRC) ratio is an accepted screening tool for primary hyperaldosteronism (PHyperA). DESIGN To assess the diagnostic significance of this ratio for other disorders of the renin-aldosterone-system (RAS), we examined 60 patients with different adrenal diseases, 32 patients with essential hypertension and 76 normotensive healthy volunteers. The aldosterone (pmol/L) and renin (mU/L) concentrations were measured in one plasma sample by an automated chemiluminescence assay (Nichols Advantage). RESULTS Patients with PHyperA (n=31) had a PAC/PRC ratio between 105 and 2328 and could be distinguished without overlap from the essential hypertension group (ratio: range 2.7-49) and normal healthy volunteers (ratio: range 0.9-71). Fourteen patients with primary hypoaldosteronism showed low PAC/PRC ratios (range 0.21-0.98) and low PAC values (range: 42-100). Seven patients with secondary hypoaldosteronism had normal PAC/PRC ratios (range 2.8-23.2) and low PAC values (range: 42-116). Eight patients with secondary hyperaldosteronism had normal PAC/PRC ratios (range 7.8-67.9) and elevated PAC values (range: 803-2917). The graphic presentation of these data allowed the differentiation of all major disorders of the RAS. CONCLUSIONS The measurement of PAC/PRC ratios using this automated system provides a sensitive and rapid screening method for PHyperA. Moreover, the measurement of both the PAC and the PAC/PRC ratio allows differentiation of other disorders of the RAS.
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Affiliation(s)
- S Diederich
- Department of Endocrinology, Diabetes and Nutrition, Charité Universitätsmedizin Berlin, Campus Benjamin Franklin, Berlin, Germany.
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Diederich S, Bobbert T, Mai K, Weger B, Pfeiffer A, Schulte HM. Hypothalamic pituitary insufficiency in a male marathon runner. Exp Clin Endocrinol Diabetes 2007. [DOI: 10.1055/s-2007-972347] [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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Andres J, Mai K, Bumke-Vogt C, Bähr V, Pfeiffer AFH, Spranger J. Fatty acids regulate the promoter activity of the 11beta-hydroxysteroid dehydrogenase type 1. Exp Clin Endocrinol Diabetes 2007. [DOI: 10.1055/s-2007-972376] [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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Mai K, Bobbert T, Reinecke F, Andres J, Bähr V, Maser-Gluth C, Schulte H, Diederich S, Pfeiffer AF, Spranger J. Free fatty acids increase androgen precursors in vivo in young healthy women. Exp Clin Endocrinol Diabetes 2007. [DOI: 10.1055/s-2007-972449] [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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Andres J, Mai K, Bähr V, Pfeiffer A, Spranger J. Aktivierung des Promotors der 11beta-Hydroxysteroid-Dehydrogenase Typ 1 durch GIP, Vitamin D3 und PPARalpha-Agonist. DIABETOL STOFFWECHS 2007. [DOI: 10.1055/s-2007-982394] [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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Mai K, Bobbert T, Kullmann V, Andres J, Rochlitz H, Osterhoff M, Weickert MO, Bähr V, Möhlig M, Pfeiffer AFH, Diederich S, Spranger J. Free fatty acids increase androgen precursors in vivo. J Clin Endocrinol Metab 2006; 91:1501-7. [PMID: 16434463 DOI: 10.1210/jc.2005-2069] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/12/2023]
Abstract
CONTEXT There is considerable evidence that metabolic factors such as insulin resistance may induce hyperandrogenemia in polycystic ovary syndrome. However, other metabolic factors such as free fatty acids (FFAs) may also contribute to androgen excess. OBJECTIVE The objective was to study effects of FFAs on adrenal production of androgen precursors in vivo. DESIGN AND PARTICIPANTS We investigated eight healthy young men, because male individuals produce the androgen precursors dehydroepiandrosterone (DHEA), DHEA sulfate, and androstenedione predominantly in the adrenal gland. A randomized controlled crossover trial was performed. INTERVENTION After a 10-h overnight fast, 20% lipid/heparin or saline/heparin infusion was given at a rate of 1.5 ml/min. Four hours after start of lipid infusion, a euglycemic hyperinsulinemic clamp was performed. MAIN OUTCOME MEASURES DHEA, androstenedione, 17-OH-progesterone, testosterone, estrone, LH, FSH, ACTH, and cortisol were measured. RESULTS The adrenal androgen precursors DHEA and androstenedione showed a circadian decline during saline/heparin infusion (P < 0.05 vs. baseline, respectively), whereas no significant changes were observed during lipid/heparin infusion (P = not significant vs. baseline, respectively). Correspondingly, DHEA and androstenedione values were significantly elevated during lipid compared with saline infusion (P < 0.05, respectively), and areas under curve of both androgen precursors were significantly increased with lipid compared with saline infusion. Notably, all changes were detected before induction of insulin resistance. CONCLUSIONS This study demonstrates that FFAs increase production of androgen precursors in vivo in men. These data tentatively suggest that hyperandrogenemia in polycystic ovary syndrome may be induced, at least in part, by elevated FFAs.
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Affiliation(s)
- K Mai
- Dept. of Endocrinology, Diabetes and Nutrition, Charite-University Medicine Berlin, Campus Benjamin Franklin, 12200 Berlin, Germany
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Mai K, Bobbert T, Andres J, Maser-Gluth C, Pfeiffer AF, Diederich S, Spranger J. Rosiglitazone lead to an decrease in 11ß-HSD1 activity in subcutaneous adipose tissue. Exp Clin Endocrinol Diabetes 2006. [DOI: 10.1055/s-2006-933079] [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: 10/19/2022]
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Mai K, Bobbert T, Andres J, Graham I, Larson TR, Möhlig M, Rochlitz H, Diederich S, Spranger J, Pfeiffer AF. Effects of rosiglitazone on muscular lipids in IGTs. Exp Clin Endocrinol Diabetes 2006. [DOI: 10.1055/s-2006-932867] [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: 10/19/2022]
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Bobbert T, Göhring I, Mai K, Busch K, Krotzky A, Catchpoole G, Wilmitzer L, Pfeiffer A, Spranger J. Establishment of metabolome measurement in human plasma. Exp Clin Endocrinol Diabetes 2006. [DOI: 10.1055/s-2006-933029] [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: 10/19/2022]
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Bobbert T, Göhring I, Mai K, Kristina B, Krotzky A, Gareth C, Wilmitzer L, Pfeiffer A, Spranger J. Metabolomics: Metabolome measurement in human plasma. DIABETOL STOFFWECHS 2006. [DOI: 10.1055/s-2006-944177] [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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