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  • Abstract: adrenarche x
  • Abstract: amenorrhoea x
  • Abstract: Gender x
  • Abstract: Hypogonadism x
  • Abstract: infertility x
  • Abstract: menarche x
  • Abstract: menopause x
  • Abstract: testes x
  • Abstract: transsexual x
  • Abstract: Turner x
  • Abstract: sperm* x
  • Abstract: ovary x
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Ladan Younesi Shahid Akbarabadi Clinical Research Development Unit (ShACRDU), Iran University of Medical Sciences (IUMS), Tehran, Iran

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Zeinab Safarpour Lima Shahid Akbarabadi Clinical Research Development Unit (ShACRDU), Iran University of Medical Sciences (IUMS), Tehran, Iran

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Azadeh Akbari Sene Department of Obstetrics and Gynecology, IVF Fellowship, Shahid Akbar-Abadi Hospital IVF Center, Iran University of Medical Sciences, Tehran, Iran

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Zahra Hosseini Jebelli Shahid Akbarabadi Clinical Research Development Unit (ShACRDU), Iran University of Medical Sciences (IUMS), Tehran, Iran

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Ghazaleh Amjad Shahid Akbarabadi Clinical Research Development Unit (ShACRDU), Iran University of Medical Sciences (IUMS), Tehran, Iran

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Polycystic ovarian syndrome (PCOS) is one of the most common endocrine disorders. The aim of this study was to find the correlation between color Doppler ultrasound and serum tests as auxiliary diagnostic criteria in areas where there is no possibility of some tests. A total of 108 patients were enrolled. They were divided into three groups including patients with PCOS, patients with PCOA ultrasound, patients with ovaries and normal hormone tests. Transvaginal sonography was performed from three groups and the results were evaluated in gray scale. The volume of the ovary, the number of follicles and the placement of follicles were recorded using using Doppler spectrum of uterine artery and ovarian stroma. Their arterial resistance index was also calculated. In the next step, serum samples were evaluated to determine the level of LH, FSH, free testosterone, DHEAS and 17-OHP hormones in the early follicular phase. Gray scale ultrasonographic findings (volume and number of ovarian follicles) as well as LH values were higher in patients with PCOS than those in the other two groups. These results proved the reliability of using these factors in the prediction of PCOS. In this study, Doppler indexes did not correlate with the size of the ovaries, the number of ovarian follicles and the measured hormone levels. The findings of transvaginal ultrasound and investigating the relationship with clinical and laboratory outcomes, a more suitable pattern could be chosen for more accurate patient selection and, leading to timely treatment and reducing the complications of the disease.

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

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The overall incidence of sex chromosome aneuploidies is approximately 1 per 500 live-born infants, but far more common at conception. I shall review the fertility aspects of the sex chromosome trisomies, XXY, XYY, and XXX, with special reference to the karyotype 45,X/47,XXX. Each has a ‘specific’ (but variable) phenotype but may be modified by mosaicism. Although the alterations in the hypothalamic–pituitary–gonadal axis are important (and discussed), the emphasis here is on potential fertility and if one might predict that at various epochs within an individual’s life span: fetal, ‘mini’-puberty, childhood, puberty, and adulthood. The reproductive axis is often affected in females with the 47,XXX karyotype with diminished ovarian reserve and accelerated loss of ovarian function. Fewer than 5% of females with Turner syndrome have the 45,X/47,XXX karyotype. They have taller stature and less severe fertility issues compared to females with the 45,X or other forms of Turner syndrome mosaicism. For the 47,XXY karyotype, non-obstructive azoospermia is almost universal with sperm retrieval by micro-testicular sperm extraction possible in slightly fewer than half of the men. Men with the 47,XYY karyotype have normal to large testes and much less testicular dysfunction than those with the 47,XXY karyotype. They do have a slight increase in infertility compared to the reference population but not nearly as severe as those with the 47,XXY karyotype. Assisted reproductive technology, especially micro-testicular sperm extraction, has an important role, especially for those with 47,XXY; however, more recent data show promising techniques for the in vitro maturation of spermatogonial stem cells and 3D organoids in culture. Assisted reproductive technology is more complex for the female, but vitrification of oocytes has shown promising advances.

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Paraskevi Kazakou Diabetes Centre, Department of Clinical Therapeutics, Alexandra Hospital, School of Medicine, National and Kapodistrian University of Athens, Athens, Greece

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Stavroula A Paschou Endocrine Unit, Department of Clinical Therapeutics, Alexandra Hospital, School of Medicine, National and Kapodistrian University of Athens, Athens, Greece

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Theodora Psaltopoulou Unit of Hematology and Oncology, Department of Clinical Therapeutics, Alexandra Hospital, School of Medicine, National and Kapodistrian University of Athens, Athens, Greece

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Maria Gavriatopoulou Unit of Hematology and Oncology, Department of Clinical Therapeutics, Alexandra Hospital, School of Medicine, National and Kapodistrian University of Athens, Athens, Greece

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Eleni Korompoki Department of Clinical Therapeutics, Alexandra Hospital, School of Medicine, National and Kapodistrian University of Athens, Athens, Greece

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Katerina Stefanaki Endocrine Unit, Department of Clinical Therapeutics, Alexandra Hospital, School of Medicine, National and Kapodistrian University of Athens, Athens, Greece

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Fotini Kanouta Department of Endocrinology, Alexandra Hospital, Athens, Greece

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Georgia N Kassi Department of Endocrinology, Alexandra Hospital, Athens, Greece

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Meletios-Athanasios Dimopoulos Unit of Hematology and Oncology, Department of Clinical Therapeutics, Alexandra Hospital, School of Medicine, National and Kapodistrian University of Athens, Athens, Greece

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Asimina Mitrakou Diabetes Centre, Department of Clinical Therapeutics, Alexandra Hospital, School of Medicine, National and Kapodistrian University of Athens, Athens, Greece

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Endocrine system plays a vital role in controlling human homeostasis. Understanding the possible effects of COVID-19 on endocrine glands is crucial to prevent and manage endocrine disorders before and during hospitalization in COVID-19-infected patients as well as to follow them up properly upon recovery. Many endocrine glands such as pancreas, hypothalamus and pituitary, thyroid, adrenal glands, testes, and ovaries have been found to express angiotensin-converting enzyme 2 receptors, the main binding site of the virus. Since the pandemic outbreak, various publications focus on the aggravation of preexisting endocrine diseases by COVID-19 infection or the adverse prognosis of the disease in endocrine patients. However, data on endocrine disorders both during the phase of the infection (early complications) and upon recovery (late complications) are scarce. The aim of this review is to identify and discuss early and late endocrine complications of COVID-19. The majority of the available data refer to glucose dysregulation and its reciprocal effect on COVID-19 infection with the main interest focusing on the presentation of new onset of diabetes mellitus. Thyroid dysfunction with low triiodothyronine, low thyroid stimulating hormone, or subacute thyroiditis has been reported. Adrenal dysregulation and impaired spermatogenesis in affected men have been also reported. Complications of other endocrine glands are still not clear. Considering the recent onset of COVID-19 infection, the available follow-up data are limited, and therefore, long-term studies are required to evaluate certain effects of COVID-19 on the endocrine glands.

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Wolfgang Koechling Ferring Pharmaceuticals A/S, Copenhagen, Denmark

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Daniel Plaksin Bio-Technology General Israel Ltd, Ferring Pharmaceuticals, Kiryat Malachi, Israel

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Glenn E Croston Croston Consulting, San Diego, California, USA

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Janni V Jeppesen The Laboratory of Reproductive Biology, The Department of Fertility at The Juliane Marie Centre, Rigshospitalet, Copenhagen University Hospital and The University of Copenhagen, Copenhagen, Denmark

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Kirsten T Macklon The Laboratory of Reproductive Biology, The Department of Fertility at The Juliane Marie Centre, Rigshospitalet, Copenhagen University Hospital and The University of Copenhagen, Copenhagen, Denmark

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Claus Yding Andersen The Laboratory of Reproductive Biology, The Department of Fertility at The Juliane Marie Centre, Rigshospitalet, Copenhagen University Hospital and The University of Copenhagen, Copenhagen, Denmark

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Recombinant FSH proteins are important therapeutic agents for the treatment of infertility, including follitropin alfa expressed in Chinese Hamster Ovary (CHO) cells and, more recently, follitropin delta expressed in the human cell line PER.C6. These recombinant FSH proteins have distinct glycosylation, and have distinct pharmacokinetic and pharmacodynamic profiles in women. Comparative experiments demonstrated that follitropin delta and follitropin alfa displayed the same in vitro potency at the human FSH receptor, but varied in their pharmacokinetics in mouse and rat. While follitropin delta clearance from serum depended in part on the hepatic asialoglycoprotein receptor (ASGPR), follitropin alfa clearance was unaffected by ASGPR inhibition in rat or genetic ablation in mice. The distinct properties of follitropin delta and follitropin alfa are likely to contribute to the differing pharmacokinetic and pharmacodynamic profiles observed in women and to influence their efficacy in therapeutic protocols for the treatment of infertility.

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Karim Gariani Service of Endocrinology, Diabetes, Nutrition and Therapeutic Patient Education, Geneva University Hospitals and Geneva University, Geneva, Switzerland

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François R Jornayvaz Service of Endocrinology, Diabetes, Nutrition and Therapeutic Patient Education, Geneva University Hospitals and Geneva University, Geneva, Switzerland
Diabetes Center, Faculty of Medicine, University of Geneva, Geneva, Switzerland

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Nonalcoholic fatty liver disease (NAFLD) is the most common cause of chronic liver disease in the industrialized world. NAFLD encompasses a whole spectrum ranging from simple steatosis to nonalcoholic steatohepatitis (NASH) and cirrhosis. The latter can lead to hepatocellular carcinoma. Furthermore, NASH is the most rapidly increasing indication for liver transplantation in western countries and therefore represents a global health issue. The pathophysiology of NASH is complex and includes multiple parallel hits. NASH is notably characterized by steatosis as well as evidence of hepatocyte injury and inflammation, with or without fibrosis. NASH is frequently associated with type 2 diabetes and conditions associated with insulin resistance. Moreover, NASH may also be found in many other endocrine diseases such as polycystic ovary syndrome, hypothyroidism, male hypogonadism, growth hormone deficiency or glucocorticoid excess, for example. In this review, we will discuss the pathophysiology of NASH associated with different endocrinopathies.

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Dorte Glintborg Department of Endocrinology and Metabolism, Odense University Hospital, Odense, Denmark

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Magda Lambaa Altinok Department of Endocrinology and Metabolism, Odense University Hospital, Odense, Denmark

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Pernille Ravn Department of Gynecology and Obstetrics, Odense University Hospital, Odense, Denmark

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Kurt Bjerregaard Stage Department of Psychiatry, Odense University Hospital, Odense, Denmark

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Kurt Højlund Department of Endocrinology and Metabolism, Odense University Hospital, Odense, Denmark

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Marianne Andersen Department of Endocrinology and Metabolism, Odense University Hospital, Odense, Denmark

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Background/aims

Polycystic ovary syndrome (PCOS) is associated with insulin resistance, adrenal hyperactivity and decreased mental health. We aimed to investigate the changes in adrenal activity, metabolic status and mental health in PCOS during treatment with escitalopram or placebo.

Methods

Forty-two overweight premenopausal women with PCOS and no clinical depression were randomized to 12-week SSRI (20 mg escitalopram/day, n = 21) or placebo (n = 21). Patients underwent clinical examination, fasting blood samples, adrenocorticotroph hormone (ACTH) test, 3-h oral glucose tolerance test (OGTT) and filled in questionnaires regarding mental health and health-related quality of life (HRQoL): WHO Well-Being Index (WHO-5), Major Depression Inventory (MDI), Short Form 36 (SF-36) and PCOS questionnaire.

Results

Included women were aged 31 (6) years (mean (s.d.)) and had body mass index (BMI) 35.8 (6.5) kg/m2 and waist 102 (12) cm. Escitalopram was associated with increased waist (median (quartiles) change 1 (0; 3) cm), P = 0.005 vs change during placebo and increased cortisol levels (cortisol 0, cortisol 60, peak cortisol and area under the curve for cortisol during ACTH test), all P< 0.05 vs changes during placebo. Escitalopram had no significant effect on measures of insulin sensitivity, insulin secretion, fasting lipids, mental health or HRQoL.

Conclusion

Waist circumference and cortisol levels increased during treatment with escitalopram in women with PCOS and no clinical depression, whereas metabolic risk markers, mental health and HRQol were unchanged.

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Frederic Schrøder Arendrup Department of Neurology, Danish Headache Center, Rigshospitalet, University of Copenhagen, Denmark

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Severine Mazaud-Guittot Inserm (Institut National de la Santé et de la Recherche Médicale), Irset – Inserm, UMR 1085, Rennes, France

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Bernard Jégou Inserm (Institut National de la Santé et de la Recherche Médicale), Irset – Inserm, UMR 1085, Rennes, France
EHESP-School of Public Health, Rennes, France

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David Møbjerg Kristensen Department of Neurology, Danish Headache Center, Rigshospitalet, University of Copenhagen, Denmark
Inserm (Institut National de la Santé et de la Recherche Médicale), Irset – Inserm, UMR 1085, Rennes, France

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Concern has been raised over chemical-induced disruption of ovary development during fetal life resulting in long-lasting consequences only manifesting themselves much later during adulthood. A growing body of evidence suggests that prenatal exposure to the mild analgesic acetaminophen/paracetamol can cause such a scenario. Therefore, in this review, we discuss three recent reports that collectively indicate that prenatal exposure in a period of 13.5 days post coitum in both rats and mouse can result in reduced female reproductive health. The combined data show that the exposure results in the reduction of primordial follicles, irregular menstrual cycle, premature absence of corpus luteum, as well as reduced fertility, resembling premature ovarian insufficiency syndrome in humans that is linked to premature menopause. This could especially affect the Western parts of the world, where the age for childbirth is continuously being increased and acetaminophen is recommended during pregnancy for pain and fever. We therefore highlight an urgent need for more studies to verify these data including both experimental and epidemiological approaches.

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Isabelle Flechtner Center for Rare Gynecological Disorders, Centre des Pathologies Gynécologiques Rares, Paris, France
Department of Paediatric Endocrinology, Gynaecology, and Diabetology, AP-HP, Necker-Enfants Malades University Hospital, IMAGINE Institute affiliate, Paris, France

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Magali Viaud Center for Rare Gynecological Disorders, Centre des Pathologies Gynécologiques Rares, Paris, France
Department of Paediatric Endocrinology, Gynaecology, and Diabetology, AP-HP, Necker-Enfants Malades University Hospital, IMAGINE Institute affiliate, Paris, France

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Dulanjalee Kariyawasam Department of Paediatric Endocrinology, Gynaecology, and Diabetology, AP-HP, Necker-Enfants Malades University Hospital, IMAGINE Institute affiliate, Paris, France

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Marie Perrissin-Fabert Center for Rare Gynecological Disorders, Centre des Pathologies Gynécologiques Rares, Paris, France
Department of Paediatric Endocrinology, Gynaecology, and Diabetology, AP-HP, Necker-Enfants Malades University Hospital, IMAGINE Institute affiliate, Paris, France

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Maud Bidet Center for Rare Gynecological Disorders, Centre des Pathologies Gynécologiques Rares, Paris, France
Department of Paediatric Endocrinology, Gynaecology, and Diabetology, AP-HP, Necker-Enfants Malades University Hospital, IMAGINE Institute affiliate, Paris, France

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Anne Bachelot Center for Rare Gynecological Disorders, Centre des Pathologies Gynécologiques Rares, Paris, France
Department of Endocrinology and Reproductive Medicine, AP-HPIE3M, Hôpital Pitié-Salpêtrière, ICAN, Paris, France

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Philippe Touraine Center for Rare Gynecological Disorders, Centre des Pathologies Gynécologiques Rares, Paris, France
Department of Endocrinology and Reproductive Medicine, AP-HPIE3M, Hôpital Pitié-Salpêtrière, ICAN, Paris, France

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Philippe Labrune Department of Pediatrics, APHP, Centre de Référence des Maladies héréditaires du Métabolisme Hépatique, Hopital Antoine Béclère and Paris Sud University, Clamart, France

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Pascale de Lonlay Reference Center of Inherited Metabolic Diseases, Université de Paris, Necker Enfants Malades, University Hospital, Paris, France
Centre for Rare Gynecological Disorders, Hospital Universitaire Necker-Enfants Malades, Paediatric Endocrinology, Gynaecology and Diabetology, AP-HP, Université de Paris, Paris, France

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Michel Polak Center for Rare Gynecological Disorders, Centre des Pathologies Gynécologiques Rares, Paris, France
Department of Paediatric Endocrinology, Gynaecology, and Diabetology, AP-HP, Necker-Enfants Malades University Hospital, IMAGINE Institute affiliate, Paris, France
Centre for Rare Gynecological Disorders, Hospital Universitaire Necker-Enfants Malades, Paediatric Endocrinology, Gynaecology and Diabetology, AP-HP, Université de Paris, Paris, France

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Classic galactosemia is a rare inborn error of galactose metabolism with a birth prevalence of about 1/30,000–60,000. Long-term complications occurring despite dietary treatment consist of premature ovarian insufficiency (POI) and neurodevelopmental impairments. We performed with the French Reference Centers for Rare Diseases a multisite collaborative questionnaire survey for classic galactosemic patients. Its primary objective was to assess their puberty, pregnancy, gonadotropic axis, and pelvic morphology by ultrasound. The secondary objective was to determine predictive factors for pregnancy without oocyte donation. Completed questionnaires from 103 patients, 56 females (median age, 19 years (3–52 years)) and 47 males (median age, 19 years (3–45 years)), were analyzed. Among the 43 females older than 13 years old, mean age for breast development first stage was 13.8 years; spontaneous menarche occurred in 21/31 females at a mean age of 14.6 years. In these 21 women, 62% had spaniomenorrhea and 7/17 older than 30 years had amenorrhea. All age-groups confounded, FSH was above reference range for 65.7% of the patients, anti-Müllerian hormone and inhibin B were undetectable, and the ovaries were small with few or no follicles detected. Among the 5 females who sought to conceive, 4 had pregnancies. Among the 47 males, 1 had cryptorchidism, all have normal testicular function and none had a desire to conceive children. Thus, spontaneous puberty and POI are both common in this population. Spontaneous menarche seems to be the best predictive factor for successful spontaneous pregnancy.

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Masatada Watanabe Laboratory of Tissue Regeneration, Hoshi University School of Pharmacy and Pharmaceutical Sciences, Shinagawa, Tokyo, Japan

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Shuji Ohno Division of Research for Pharmacy Students Education, Hoshi University, Shinagawa, Tokyo, Japan

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Hiroshi Wachi Laboratory of Tissue Regeneration, Hoshi University School of Pharmacy and Pharmaceutical Sciences, Shinagawa, Tokyo, Japan

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Emerging evidence suggests that sex steroids are important for human skin health. In particular, estrogen improves skin thickness, elasticity and moisture of older women. The major source of circulating estrogen is the ovary; however, local estrogen synthesis and secretion have important roles in, for example, bone metabolism and breast cancer development. We hypothesized that infiltrated peripheral monocytes are one of the sources of estrogen in skin tissues. We also hypothesized that, during atopic dermatitis under stress, a decline in the hypothalamus–pituitary–adrenal axis (HPA) and facilitation of the (hypothalamus)–sympathetic–adrenomedullary system (SAM) attenuates estrogen secretion from monocytes. Based on this hypothesis, we tested aromatase expression in the human peripheral monocyte-derived cell line THP-1 in response to the synthetic glucocorticoid dexamethasone (Dex), the synthetic β-agonist isoproterenol (Iso) and the β-antagonist propranolol (Pro). Dex mimics glucocorticoid secreted during excitation of the HPA, and Iso mimics catecholamine secreted during excitation of the SAM. We found that aromatase activity and the CYP19A1 gene transcript were both upregulated in THP-1 cells in the presence of Dex. Addition of Iso induced their downregulation and further addition of Pro rescued aromatase expression. These results may suggest that attenuation of estrogen secretion from peripheral monocytes could be a part of the pathology of stress-caused deterioration of atopic dermatitis. Further examination using an in vitro human skin model including THP-1 cells might be a valuable tool for investigating the therapeutic efficacy and mechanism of estrogen treatment for skin health.

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Luigi Laino Department of Molecular Medicine, Department of Pediatrics and Hematology, Psychology Department, Department of Pediatric Surgery, Medical Genetics, San Camillo-Forlanini Hospital, Sapienza University, A.O. San Camillo-Forlanini, Padiglione Morgagni, I piano, UOC Laboratorio di Genetica Medica, Circonvallazione Gianicolense 87, Rome 00152, Italy

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Silvia Majore Department of Molecular Medicine, Department of Pediatrics and Hematology, Psychology Department, Department of Pediatric Surgery, Medical Genetics, San Camillo-Forlanini Hospital, Sapienza University, A.O. San Camillo-Forlanini, Padiglione Morgagni, I piano, UOC Laboratorio di Genetica Medica, Circonvallazione Gianicolense 87, Rome 00152, Italy

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Nicoletta Preziosi Department of Molecular Medicine, Department of Pediatrics and Hematology, Psychology Department, Department of Pediatric Surgery, Medical Genetics, San Camillo-Forlanini Hospital, Sapienza University, A.O. San Camillo-Forlanini, Padiglione Morgagni, I piano, UOC Laboratorio di Genetica Medica, Circonvallazione Gianicolense 87, Rome 00152, Italy

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Barbara Grammatico Department of Molecular Medicine, Department of Pediatrics and Hematology, Psychology Department, Department of Pediatric Surgery, Medical Genetics, San Camillo-Forlanini Hospital, Sapienza University, A.O. San Camillo-Forlanini, Padiglione Morgagni, I piano, UOC Laboratorio di Genetica Medica, Circonvallazione Gianicolense 87, Rome 00152, Italy

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Carmelilia De Bernardo Department of Molecular Medicine, Department of Pediatrics and Hematology, Psychology Department, Department of Pediatric Surgery, Medical Genetics, San Camillo-Forlanini Hospital, Sapienza University, A.O. San Camillo-Forlanini, Padiglione Morgagni, I piano, UOC Laboratorio di Genetica Medica, Circonvallazione Gianicolense 87, Rome 00152, Italy

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Salvatore Scommegna Department of Molecular Medicine, Department of Pediatrics and Hematology, Psychology Department, Department of Pediatric Surgery, Medical Genetics, San Camillo-Forlanini Hospital, Sapienza University, A.O. San Camillo-Forlanini, Padiglione Morgagni, I piano, UOC Laboratorio di Genetica Medica, Circonvallazione Gianicolense 87, Rome 00152, Italy

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Anna Maria Rapone Department of Molecular Medicine, Department of Pediatrics and Hematology, Psychology Department, Department of Pediatric Surgery, Medical Genetics, San Camillo-Forlanini Hospital, Sapienza University, A.O. San Camillo-Forlanini, Padiglione Morgagni, I piano, UOC Laboratorio di Genetica Medica, Circonvallazione Gianicolense 87, Rome 00152, Italy

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Giacinto Marrocco Department of Molecular Medicine, Department of Pediatrics and Hematology, Psychology Department, Department of Pediatric Surgery, Medical Genetics, San Camillo-Forlanini Hospital, Sapienza University, A.O. San Camillo-Forlanini, Padiglione Morgagni, I piano, UOC Laboratorio di Genetica Medica, Circonvallazione Gianicolense 87, Rome 00152, Italy

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Irene Bottillo Department of Molecular Medicine, Department of Pediatrics and Hematology, Psychology Department, Department of Pediatric Surgery, Medical Genetics, San Camillo-Forlanini Hospital, Sapienza University, A.O. San Camillo-Forlanini, Padiglione Morgagni, I piano, UOC Laboratorio di Genetica Medica, Circonvallazione Gianicolense 87, Rome 00152, Italy

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Paola Grammatico
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Sex development is a process under genetic control directing both the bi-potential gonads to become either a testis or an ovary, and the consequent differentiation of internal ducts and external genitalia. This complex series of events can be altered by a large number of genetic and non-genetic factors. Disorders of sex development (DSD) are all the medical conditions characterized by an atypical chromosomal, gonadal, or phenotypical sex. Incomplete knowledge of the genetic mechanisms involved in sex development results in a low probability of determining the molecular definition of the genetic defect in many of the patients. In this study, we describe the clinical, cytogenetic, and molecular study of 88 cases with DSD, including 29 patients with 46,XY and disorders in androgen synthesis or action, 18 with 46,XX and disorders in androgen excess, 17 with 46,XY and disorders of gonadal (testicular) development, 11 classified as 46,XX other, eight with 46,XX and disorders of gonadal (ovarian) development, and five with sex chromosome anomalies. In total, we found a genetic variant in 56 out of 88 of them, leading to the clinical classification of every patient, and we outline the different steps required for a coherent genetic testing approach. In conclusion, our results highlight the fact that each category of DSD is related to a large number of different DNA alterations, thus requiring multiple genetic studies to achieve a precise etiological diagnosis for each patient.

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