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Mette Bøgehave Department of Clinical Biochemistry, Hospital South West Jutland, University Hospital of Southern Denmark, Esbjerg, Denmark
Unit for Thrombosis Research, Department of Regional Health Research, University of Southern Denmark, Denmark

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Dorte Glintborg Department of Endocrinology, Odense University Hospital, Odense, Denmark
Department of Clinical Research, University of Southern Denmark, Odense, Denmark
OPEN, Open Patient data Explorative Network, Odense University Hospital, Region of Southern Denmark, Odense, Denmark

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Jørgen Brodersen Gram Department of Clinical Biochemistry, Hospital South West Jutland, University Hospital of Southern Denmark, Esbjerg, Denmark
Unit for Thrombosis Research, Department of Regional Health Research, University of Southern Denmark, Denmark

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Else-Marie Bladbjerg Department of Clinical Biochemistry, Hospital South West Jutland, University Hospital of Southern Denmark, Esbjerg, Denmark
Unit for Thrombosis Research, Department of Regional Health Research, University of Southern Denmark, Denmark

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Marianne Skovsager Andersen Department of Endocrinology, Odense University Hospital, Odense, Denmark
Department of Clinical Research, University of Southern Denmark, Odense, Denmark

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Johannes Jakobsen Sidelmann Department of Clinical Biochemistry, Hospital South West Jutland, University Hospital of Southern Denmark, Esbjerg, Denmark
Unit for Thrombosis Research, Department of Regional Health Research, University of Southern Denmark, Denmark

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Introduction Opioid medications are widely used to treat chronic non-cancer pain ( 1 ). Male hypogonadism, characterized by low concentrations of testosterone and luteinizing hormone (LH), is one of the most well-described hormonal adverse

Article Type:
Research Article
Collections:
Reproduction
DOI:
https://doi.org/10.1530/EC-22-0455
Volume/Issue:
Volume 12: Issue 4
Open access
Anna C van der Burgh Department of Internal Medicine, Erasmus University Medical Center, Rotterdam, the Netherlands
Department of Epidemiology, Erasmus University Medical Center, Rotterdam, the Netherlands

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Samer R Khan Department of Internal Medicine, Erasmus University Medical Center, Rotterdam, the Netherlands
Department of Epidemiology, Erasmus University Medical Center, Rotterdam, the Netherlands

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Sebastian J C M M Neggers Department of Internal Medicine, Erasmus University Medical Center, Rotterdam, the Netherlands

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Ewout J Hoorn Department of Internal Medicine, Erasmus University Medical Center, Rotterdam, the Netherlands

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Layal Chaker Department of Internal Medicine, Erasmus University Medical Center, Rotterdam, the Netherlands
Department of Epidemiology, Erasmus University Medical Center, Rotterdam, the Netherlands

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is testosterone. However, literature regarding the effects of testosterone on the kidney has shown conflicting results. On the one hand, it is suggested that testosterone has harmful effects on the kidney, such as glomerular and tubular damage, kidney

Article Type:
Research Article
Collections:
Reproduction
DOI:
https://doi.org/10.1530/EC-22-0061
Volume/Issue:
Volume 11: Issue 6
Open access
Amar Osmancevic School of Public Health and Community Medicine, Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden

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Kristin Ottarsdottir School of Public Health and Community Medicine, Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden

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Margareta Hellgren School of Public Health and Community Medicine, Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden

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Ulf Lindblad School of Public Health and Community Medicine, Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden

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Bledar Daka School of Public Health and Community Medicine, Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden

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Introduction Low testosterone as well as high C-reactive protein (CRP) levels have been associated with increased risk for all-cause mortality in men ( 1 , 2 , 3 , 4 ). Testosterone concentration decreases with aging, and if reaching

Article Type:
Research Article
Collections:
Reproduction
DOI:
https://doi.org/10.1530/EC-22-0141
Volume/Issue:
Volume 11: Issue 7
Open access
Giuseppe Grande Unit of Andrology and Reproductive Medicine, University Hospital of Padova, Padova, Italy

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Andrea Graziani Department of Medicine, University of Padova, Padova, Italy

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Antonella Di Mambro Unit of Andrology and Reproductive Medicine, University Hospital of Padova, Padova, Italy

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Riccardo Selice Unit of Andrology and Reproductive Medicine, University Hospital of Padova, Padova, Italy

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Alberto Ferlin Unit of Andrology and Reproductive Medicine, University Hospital of Padova, Padova, Italy
Department of Medicine, University of Padova, Padova, Italy

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later in life. Testosterone and bone health in subjects with KS Testosterone is clearly the major testicular factor influencing bone metabolism ( 1 ), having a direct effect on osteoclasts, osteoblasts, and osteocytes and promoting periosteal

Article Type:
Review Article
Collections:
Reproduction
DOI:
https://doi.org/10.1530/EC-23-0058
Volume/Issue:
Volume 12: Issue 8
Open access
Claus H Gravholt Department of Endocrinology, Aarhus University Hospital, Aarhus, Denmark
Department of Molecular Medicine, Aarhus University Hospital, Aarhus, Denmark
Department of Clinical Medicine, Aarhus University, Aarhus, Denmark

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Alberto Ferlin Department of Medicine, Unit of Andrology and Reproductive Medicine, University of Padova, Padova, Italy

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Joerg Gromoll Centre of Reproductive Medicine and Andrology, Münster, Germany

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Anders Juul Department of Growth and Reproduction Copenhagen University Hospital - Rigshospitalet, Copenhagen, Denmark
Department of Clinical Medicine, Faculty of Health Sciences, University of Copenhagen, Copenhagen, Denmark

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Armin Raznahan Section on Developmental Neurogenomics, National Institute of Mental Health Intramural Research Program, National Institutes of Health, Bethesda, Maryland, USA

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Sophie van Rijn Clinical Neurodevelopmental Sciences, Leiden University, Leiden, The Netherlands and TRIXY Center of Expertise, Leiden University Treatment and Expertise Centre (LUBEC), Leiden, The Netherlands

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Alan D Rogol Department of Pediatrics, University of Virginia, Charlottesville, Virginia, USA

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Anne Skakkebæk Department of Molecular Medicine, Aarhus University Hospital, Aarhus, Denmark
Department of Clinical Medicine, Aarhus University, Aarhus, Denmark
Department of Clinical Genetics, Aarhus University Hospital, Aarhus, Denmark

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Nicole Tartaglia Department of Pediatrics, Developmental Pediatrics, University of Colorado School of Medicine, Aurora, Colorado, USA

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Hanna Swaab Clinical Neurodevelopmental Sciences, Leiden University, Leiden, The Netherlands and TRIXY Center of Expertise, Leiden University Treatment and Expertise Centre (LUBEC), Leiden, The Netherlands

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found diminished bone mineral density (BMD) and increased risk of vertebral fractures in subjects with Klinefelter syndrome ( 18 , 19 , 20 ). Testosterone replacement therapy (TRT) increases BMD in men with Klinefelter syndrome ( 21 , 22 ), but there

Article Type:
Review Article
Collections:
Reproduction
DOI:
https://doi.org/10.1530/EC-22-0500
Volume/Issue:
Volume 12: Issue 3
Open access
Milou Cecilia Madsen Department of Internal Medicine and Center of Expertise on Gender Dysphoria, Amsterdam UMC, Vrije Universiteit Amsterdam, Amsterdam, the Netherlands

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Martin den Heijer Department of Internal Medicine and Center of Expertise on Gender Dysphoria, Amsterdam UMC, Vrije Universiteit Amsterdam, Amsterdam, the Netherlands

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Claudia Pees Walaeus Library, Leiden University Medical Center, Leiden, the Netherlands

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Nienke R Biermasz Division of Endocrinology, Department of Medicine, Leiden University Medical Center, Leiden, the Netherlands

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Leontine E H Bakker Division of Endocrinology, Department of Medicine, Leiden University Medical Center, Leiden, the Netherlands

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Introduction Testosterone is the primary sex hormone and anabolic steroid in men. It is secreted primarily by the Leydig cells of the testicles and, to a much lesser extent, by the adrenal glands. Testes produce 3–10 mg of testosterone daily

Article Type:
Review Article
Collections:
Reproduction
DOI:
https://doi.org/10.1530/EC-22-0112
Volume/Issue:
Volume 11: Issue 8
Open access
Hans Valdemar López Krabbe Department of Growth and Reproduction, Copenhagen University Hospital, Rigshospitalet, Copenhagen, Denmark
International Centre for Research and Research Training in Endocrine Disruption of Male Reproduction and Child Health (EDMaRC), Copenhagen University Hospital - Rigshospitalet, Copenhagen, Denmark

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Jørgen Holm Petersen Department of Growth and Reproduction, Copenhagen University Hospital, Rigshospitalet, Copenhagen, Denmark
International Centre for Research and Research Training in Endocrine Disruption of Male Reproduction and Child Health (EDMaRC), Copenhagen University Hospital - Rigshospitalet, Copenhagen, Denmark
Section of Biostatistics, University of Copenhagen, Copenhagen, Denmark

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Louise Laub Asserhøj Department of Growth and Reproduction, Copenhagen University Hospital, Rigshospitalet, Copenhagen, Denmark
International Centre for Research and Research Training in Endocrine Disruption of Male Reproduction and Child Health (EDMaRC), Copenhagen University Hospital - Rigshospitalet, Copenhagen, Denmark
Department of Fertility, Copenhagen University Hospital, Rigshospitalet, Copenhagen, Denmark

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Trine Holm Johannsen Department of Growth and Reproduction, Copenhagen University Hospital, Rigshospitalet, Copenhagen, Denmark
International Centre for Research and Research Training in Endocrine Disruption of Male Reproduction and Child Health (EDMaRC), Copenhagen University Hospital - Rigshospitalet, Copenhagen, Denmark

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Peter Christiansen Department of Growth and Reproduction, Copenhagen University Hospital, Rigshospitalet, Copenhagen, Denmark
International Centre for Research and Research Training in Endocrine Disruption of Male Reproduction and Child Health (EDMaRC), Copenhagen University Hospital - Rigshospitalet, Copenhagen, Denmark

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Rikke Beck Jensen Department of Growth and Reproduction, Copenhagen University Hospital, Rigshospitalet, Copenhagen, Denmark
International Centre for Research and Research Training in Endocrine Disruption of Male Reproduction and Child Health (EDMaRC), Copenhagen University Hospital - Rigshospitalet, Copenhagen, Denmark
Department of Clinical Medicine, University of Copenhagen, Copenhagen, Denmark

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Line Hartvig Cleemann Department of Growth and Reproduction, Copenhagen University Hospital, Rigshospitalet, Copenhagen, Denmark
International Centre for Research and Research Training in Endocrine Disruption of Male Reproduction and Child Health (EDMaRC), Copenhagen University Hospital - Rigshospitalet, Copenhagen, Denmark

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Casper P Hagen Department of Growth and Reproduction, Copenhagen University Hospital, Rigshospitalet, Copenhagen, Denmark
International Centre for Research and Research Training in Endocrine Disruption of Male Reproduction and Child Health (EDMaRC), Copenhagen University Hospital - Rigshospitalet, Copenhagen, Denmark

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Lærke Priskorn Department of Growth and Reproduction, Copenhagen University Hospital, Rigshospitalet, Copenhagen, Denmark
International Centre for Research and Research Training in Endocrine Disruption of Male Reproduction and Child Health (EDMaRC), Copenhagen University Hospital - Rigshospitalet, Copenhagen, Denmark

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Niels Jørgensen Department of Growth and Reproduction, Copenhagen University Hospital, Rigshospitalet, Copenhagen, Denmark
International Centre for Research and Research Training in Endocrine Disruption of Male Reproduction and Child Health (EDMaRC), Copenhagen University Hospital - Rigshospitalet, Copenhagen, Denmark

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Katharina M Main Department of Growth and Reproduction, Copenhagen University Hospital, Rigshospitalet, Copenhagen, Denmark
International Centre for Research and Research Training in Endocrine Disruption of Male Reproduction and Child Health (EDMaRC), Copenhagen University Hospital - Rigshospitalet, Copenhagen, Denmark
Department of Clinical Medicine, University of Copenhagen, Copenhagen, Denmark

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Anders Juul Department of Growth and Reproduction, Copenhagen University Hospital, Rigshospitalet, Copenhagen, Denmark
International Centre for Research and Research Training in Endocrine Disruption of Male Reproduction and Child Health (EDMaRC), Copenhagen University Hospital - Rigshospitalet, Copenhagen, Denmark
Department of Clinical Medicine, University of Copenhagen, Copenhagen, Denmark

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Lise Aksglaede Department of Growth and Reproduction, Copenhagen University Hospital, Rigshospitalet, Copenhagen, Denmark
International Centre for Research and Research Training in Endocrine Disruption of Male Reproduction and Child Health (EDMaRC), Copenhagen University Hospital - Rigshospitalet, Copenhagen, Denmark

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well as an increased risk of developing insulin resistance, metabolic syndrome, and osteoporosis ( 1 ). Low to low-normal serum concentrations of testosterone are seen in most adults with KS, but nearly all have highly elevated concentrations of

Article Type:
Research Article
Collections:
Reproduction
DOI:
https://doi.org/10.1530/EC-23-0031
Volume/Issue:
Volume 12: Issue 7
Open access
Shanlee M Davis Department of Pediatrics, University of Colorado School of Medicine, Aurora, Colorado, USA
eXtraOrdinarY Kids Clinic, Children's Hospital Colorado, Aurora, Colorado, USA

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Rhianna Urban Department of Laboratory Medicine and Pathology, Mayo Clinic College of Medicine, Rochester, Minnesota, USA

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Angelo D’Alessandro Department of Biochemistry and Molecular Genetics, University of Colorado School of Medicine, Aurora, Colorado, USA

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Julie A Reisz Department of Biochemistry and Molecular Genetics, University of Colorado School of Medicine, Aurora, Colorado, USA

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Christine L Chan Department of Pediatrics, University of Colorado School of Medicine, Aurora, Colorado, USA

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Megan Kelsey Department of Pediatrics, University of Colorado School of Medicine, Aurora, Colorado, USA

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Susan Howell Department of Pediatrics, University of Colorado School of Medicine, Aurora, Colorado, USA
eXtraOrdinarY Kids Clinic, Children's Hospital Colorado, Aurora, Colorado, USA

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Nicole Tartaglia Department of Pediatrics, University of Colorado School of Medicine, Aurora, Colorado, USA
eXtraOrdinarY Kids Clinic, Children's Hospital Colorado, Aurora, Colorado, USA

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Philip Zeitler Department of Pediatrics, University of Colorado School of Medicine, Aurora, Colorado, USA
eXtraOrdinarY Kids Clinic, Children's Hospital Colorado, Aurora, Colorado, USA

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Peter Baker II Department of Pediatrics, University of Colorado School of Medicine, Aurora, Colorado, USA

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hypogonadism, a nearly universal finding in adult men with KS, has been implicated as the underlying pathologic mechanism leading to this increased risk ( 2 ). As an anabolic steroid, testosterone has effects on body composition and mitochondrial metabolism

Article Type:
Research Article
Collections:
Reproduction
DOI:
https://doi.org/10.1530/EC-22-0523
Volume/Issue:
Volume 12: Issue 5
Open access
Pravik Solanki Faculty of Medicine, Nursing and Health Sciences, Monash University, Victoria, Australia
Alfred Health, Melbourne, Victoria, Australia

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Beng Eu Prahran Market Clinic, Victoria, Australia
Department of General Practice, Melbourne Medical School, The University of Melbourne, Victoria, Australia

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Jeremy Smith Faculty of Science, University of Western Australia, Perth, Australia

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Carolyn Allan Hudson Institute of Medical Research, Melbourne, Victoria, Australia

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Kevin Lee Faculty of Medicine, Nursing and Health Sciences, Monash University, Victoria, Australia

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testosterone replacement therapy ( 5 ). The severity of ASIH depends on the type, combination, timeframe and dosages of AAS being abused, which can vary considerably between abusers ( 6 ). Up to 90% may combine various forms of AAS, otherwise known as

Article Type:
Research Article
Collections:
Reproduction
DOI:
https://doi.org/10.1530/EC-23-0358
Volume/Issue:
Volume 12: Issue 12
Open access
Tristan Avril Pediatric Endocrinology Department, CHU Bicetre, Assistance Publique-Hôpitaux de Paris, Reference Center for Rare Disease CRMR DevGen, Le Kremlin Bicêtre, Paris, France

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Quentin Hennocq Datascience platform, Imagine Institute, Université Paris Cité, Paris, France

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Anne-Sophie Lambert Pediatric Endocrinology Department, CHU Bicetre, Assistance Publique-Hôpitaux de Paris, Reference Center for Rare Disease CRMR DevGen, Le Kremlin Bicêtre, Paris, France

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Juliane Leger Pediatric Endocrinology Department, CHU Robert Debré, Assistance Publique-Hôpitaux de Paris, Reference Center for Rare Disease CRMR de la Croissance et du Développement, Paris, France
Université Paris Cité, Faculté de Santé, UFR de Médecine, Paris, France

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Dominique Simon Pediatric Endocrinology Department, CHU Robert Debré, Assistance Publique-Hôpitaux de Paris, Reference Center for Rare Disease CRMR de la Croissance et du Développement, Paris, France

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Laetitia Martinerie Pediatric Endocrinology Department, CHU Robert Debré, Assistance Publique-Hôpitaux de Paris, Reference Center for Rare Disease CRMR de la Croissance et du Développement, Paris, France
Université Paris Cité, Faculté de Santé, UFR de Médecine, Paris, France
Inserm UMR1185, Le Kremlin Bicetre, Paris, France

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Claire Bouvattier Pediatric Endocrinology Department, CHU Bicetre, Assistance Publique-Hôpitaux de Paris, Reference Center for Rare Disease CRMR DevGen, Le Kremlin Bicêtre, Paris, France
Inserm UMR1185, Le Kremlin Bicetre, Paris, France
Paris-Saclay University, Paris, France

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cells, and perhaps, by extension, for future fertility ( 3 , 4 , 5 , 6 ). Anti-Müllerian hormone (AMH) and Inhibin B are reliable biomarkers reflecting Sertoli cells function, while testosterone is an index of Leydig cell activation. Boys with CHH

Article Type:
Research Article
Collections:
Reproduction
DOI:
https://doi.org/10.1530/EC-22-0252
Volume/Issue:
Volume 12: Issue 4
Open access