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1.
Ann Surg Oncol ; 2024 Jul 05.
Artigo em Inglês | MEDLINE | ID: mdl-38969859

RESUMO

BACKGROUND: Analysis of temporal trends of urinary diversion (UD) and identification of predictive factors for continent urinary diversion (CUD) in patients with bladder cancer (BC) is scarce and data on large cohorts are missing. We aimed to describe longitudinal temporal trends and predictive factors for UD among patients with BC receiving radical cystectomy (RC). PATIENTS AND METHODS: We retrospectively analysed institutional data collected from patients undergoing RC from 1986 to 2022 to describe changes in patients' characteristics and UD. Primary end points were patients' characteristics associated with type of UD. Logistic regression analysis was used to determine predictive factors for CUD. RESULTS: In total, 2224 patients (77.16% male, 22.84% female) with a mean age of 66 years [standard deviation (SD), 10.64 years] were included. We observed an increase in mean age from 59.86 (10.8) years (1986-1990) to 69.85 (9.99) years (2016-2022) (p < 0.001). The proportion of CUD gradually declined from 43.72% (94/215; 1986-1990) to 18.38% (86/468; 2016-2022). Patients who were male [odds ratio (OR): 1.92, 95% confidence interval (CI): 1.43-2.57, p < 0.001), younger (OR: 0.88, 95% CI: 0.87-0.89, p < 0.001) and had no hydronephrosis prior to RC (OR: 2.2, 95% CI: 1.66-2.92, p < 0.001) were more likely to receive CUD. CONCLUSIONS: We report the largest European single-center cohort of UD after RC, demonstrating a significant shift from CUD to IUD, accompanied by an increasing age. Finally, our data mirrors the development and extensive experience with the Mainz Pouch-I in the 1980's and 1990's together with other colon pouches.

2.
BMC Endocr Disord ; 22(1): 166, 2022 Jun 27.
Artigo em Inglês | MEDLINE | ID: mdl-35761280

RESUMO

BACKGROUND: Differences in sexual development (DSD) are rare diseases, which affect the chromosomal, anatomical or gonadal sex differentiation. Although patient education is recommended as essential in a holistic care approach, standardised programmes are still lacking. The present protocol describes the aims, study design and methods of the Empower-DSD project, which developed an age-adapted multidisciplinary education programme to improve the diagnosis-specific knowledge, skills and empowerment of patients and their parents. METHODS: The new patient education programme was developed for children, adolescents and young adults with congenital adrenal hyperplasia, Turner syndrome, Klinefelter syndrome or XX-/or XY-DSD and their parents. The quantitative and qualitative evaluation methods include standardised questionnaires, semi-structured interviews, and participatory observation. The main outcomes (assessed three and six months after the end of the programme) are health-related quality of life, disease burden, coping, and diagnosis-specific knowledge. The qualitative evaluation examines individual expectations and perceptions of the programme. The results of the quantitative and qualitative evaluation will be triangulated. DISCUSSION: The study Empower-DSD was designed to reduce knowledge gaps regarding the feasibility, acceptance and effects of standardised patient education programmes for children and youth with DSD and their parents. A modular structured patient education programme with four generic and three diagnosis-specific modules based on the ModuS concept previously established for other chronic diseases was developed. The topics, learning objectives and recommended teaching methods are summarised in the structured curricula, one for each diagnosis and age group. At five study centres, 56 trainers were qualified for the implementation of the training programmes. A total of 336 subjects have been already enrolled in the study. The recruitment will go on until August 2022, the last follow-up survey is scheduled for February 2023. The results will help improve multidisciplinary and integrated care for children and youth with DSD and their families. TRIAL REGISTRATION: German Clinical Trials Register, DRKS00023096 . Registered 8 October 2020 - Retrospectively registered.


Assuntos
Educação de Pacientes como Assunto , Qualidade de Vida , Adolescente , Criança , Humanos , Pais , Desenvolvimento Sexual , Inquéritos e Questionários , Adulto Jovem
3.
Obes Facts ; 15(2): 281-291, 2022.
Artigo em Inglês | MEDLINE | ID: mdl-34983051

RESUMO

INTRODUCTION: Obesity in women is often associated with hyperandrogenism, but the role of adipose tissue (AT) in androgen synthesis remains unclear. Therefore, we studied whether AT could be a source of androgens promoting hyperandrogenism. METHODS: Subcutaneous and visceral (visc) AT was collected from lean and obese women. Androgen levels were evaluated in serum, AT, and cell-culture supernatant. Gene and protein expression of steroidogenic enzymes were determined. RESULTS: Obese subjects had elevated serum androgen levels, which reduced after weight loss. Androgens were measurable in AT and in cell-culture supernatants of adipocytes. Steroids were higher in AT from obese women, with the highest difference for testosterone in visc AT (+7.9-fold, p = 0.032). Steroidogenic enzymes were expressed in human AT with depot-specific differences. Obese women showed a significantly higher expression of genes of the backdoor pathway and of CYP19 in visc AT. CONCLUSION: The whole steroidogenic machinery of the classical and backdoor pathways of steroidogenesis, and the capacity for androgen biosynthesis, were found in both AT depots and cultured adipocytes. Therefore, we hypothesize that AT is a de novo site of androgen production and the backdoor pathway of steroidogenesis might be a new pathomechanism for hyperandrogenism in women with obesity.


Assuntos
Androgênios , Hiperandrogenismo , Adipócitos/metabolismo , Tecido Adiposo/metabolismo , Androgênios/metabolismo , Feminino , Humanos , Hiperandrogenismo/complicações , Hiperandrogenismo/metabolismo , Masculino , Obesidade/complicações , Obesidade/metabolismo
4.
Front Cell Dev Biol ; 9: 699554, 2021.
Artigo em Inglês | MEDLINE | ID: mdl-34381781

RESUMO

The sperm-specific Ca2+ channel CatSper registers chemical cues that assist human sperm to fertilize the egg. Prime examples are progesterone and prostaglandin E1 that activate CatSper without involving classical nuclear and G protein-coupled receptors, respectively. Here, we study the action of seminal and follicular fluid as well of the contained individual prostaglandins and steroids on the intracellular Ca2+ concentration of sperm from donors and CATSPER2-deficient patients that lack functional CatSper channels. We show that any of the reproductive steroids and prostaglandins evokes a rapid Ca2+ increase that invariably rests on Ca2+ influx via CatSper. The hormones compete for the same steroid- and prostaglandin-binding site to activate the channel, respectively. Analysis of the hormones' structure-activity relationship highlights their unique pharmacology in sperm and the chemical features determining their effective properties. Finally, we show that Zn2+ suppresses the action of steroids and prostaglandins on CatSper, which might prevent premature prostaglandin activation of CatSper in the ejaculate, aiding sperm to escape from the ejaculate into the female genital tract. Altogether, our findings reinforce that human CatSper serves as a promiscuous chemosensor that enables sperm to probe the varying hormonal microenvironment prevailing at different stages during their journey across the female genital tract.

5.
Endocrinology ; 162(4)2021 04 01.
Artigo em Inglês | MEDLINE | ID: mdl-33507237

RESUMO

Type 1 diabetes mellitus (T1DM) is associated with impaired spermatogenesis and lower testosterone levels and epididymal weight. However, the underlying processes in the testis are unknown and remain to be elucidated. Therefore, the present study focused on the effects of T1DM on testicular function in a spontaneously diabetic rat model. BB/OKL rats after diabetes manifestation were divided into 3 groups: those without insulin treatment and insulin treatment for a duration of 2 and of 6 weeks. Anthropometrical data, circulating levels of gonadotrophins, testosterone, and inhibin B were measured. Intratesticular testosterone, oxidative stress, inflammation, and apoptosis were analyzed. Key enzymes of steroidogenesis were evaluated in the testis. Untreated diabetic rats had significantly lower serum follicle-stimulating hormone and luteinizing hormone levels. Serum and intratesticular testosterone levels significantly decreased in untreated diabetic rats compared to healthy controls. Key markers of Leydig cell function were significantly downregulated at the RNA level: insulin-like factor 3 (Insl3) by 53% (P = .006), Star by 51% (P = .004), Cyp11A1 by 80% (P = .003), 3Beta-Hsd2 by 61% (P = .005), and Pbr by 52% (P = .002). In the insulin-treated group, only Cyp11A1 and 3Beta-Hsd2 transcripts were significantly lower. Interestingly, the long-term insulin-treated group showed significant upregulation of most steroidogenic enzymes without affecting testosterone levels. Tumor necrosis factor α and apoptosis were significantly increased in the long-term insulin-treated rats. In conclusion T1DM, with a severe lack of insulin, has an adverse action on Leydig cell function. This is partially reversible with well-compensated blood glucose control. Long-term T1DM adversely affects Leydig cell function because of the process of inflammation and apoptosis.


Assuntos
Diabetes Mellitus Tipo 1/tratamento farmacológico , Diabetes Mellitus Tipo 1/metabolismo , Insulina/administração & dosagem , Células Intersticiais do Testículo/efeitos dos fármacos , Células Intersticiais do Testículo/metabolismo , Animais , Apoptose/efeitos dos fármacos , Enzima de Clivagem da Cadeia Lateral do Colesterol/genética , Enzima de Clivagem da Cadeia Lateral do Colesterol/metabolismo , Diabetes Mellitus Tipo 1/genética , Diabetes Mellitus Tipo 1/fisiopatologia , Hormônio Foliculoestimulante/metabolismo , Humanos , Insulina/genética , Insulina/metabolismo , Células Intersticiais do Testículo/citologia , Hormônio Luteinizante/metabolismo , Masculino , Proteínas/genética , Proteínas/metabolismo , Ratos , Espermatogênese/efeitos dos fármacos , Testículo/citologia , Testículo/efeitos dos fármacos , Testículo/metabolismo , Testosterona/metabolismo
6.
Dtsch Med Wochenschr ; 146(3): 206-208, 2021 Feb.
Artigo em Alemão | MEDLINE | ID: mdl-33440433

RESUMO

As the pandemic continues, there is increasing hope vaccinations are becoming available. As a solution for a nationwide immunization against the virus, a compulsory vaccination is repeatedly discussed. However, some opponents of vaccination are threatened by the idea of a possible mandatory vaccination. It is therefore necessary to discuss whether such a compulsory vaccination is theoretically legally enforceable. This article discusses the current legal situation in Germany. The introduction of a potential compulsory vaccination against the SARS-CoV-2 virus represents an encroachment on the fundamental right of physical integrity. According to §â€Š20 (6) IfSG, a protective vaccination for threatened parts of the population is permissible by statutory order, if a transmissible disease with clinically severe courses occurs and its epidemic spread can be expected.


Assuntos
Vacinas contra COVID-19/administração & dosagem , COVID-19/prevenção & controle , SARS-CoV-2/imunologia , Vacinação/legislação & jurisprudência , Alemanha , Humanos
7.
J Pediatr Endocrinol Metab ; 34(1): 13-23, 2021 Jan 27.
Artigo em Inglês | MEDLINE | ID: mdl-33185575

RESUMO

Over the last 50 years, there has been a steady decline in fertility rates in humans, which has occurred in parallel with an increasing incidence of obesity and metabolic disorders. The potential impact of these disorders and plausible mechanisms by which they negatively influence male reproduction are only partly understood and published data are often controversial. Obesity is one of the most important health challenges worldwide and is becoming more prevalent in children and adolescents. Obesity, the metabolic syndrome and related co-morbidities can lead to impaired male reproductive function, including adverse effects on spermatogenesis and steroidogenesis as illustrated by reduced sperm number and quality, decreased testosterone levels and elevated inflammatory markers. The incidence of diabetes mellitus type I is also dramatically increasing and may negatively impact spermatogenesis and testicular function, resulting in decreased serum testosterone and epididymal weight. In this review, we summarize and discuss the effects of metabolic diseases that typically develop during childhood and adolescence on later reproductive function and fertility. While impact on reproductive health is likely observed in both sexes, we have chosen to focus on the male in the current review. Specifically, we illustrate adverse effects of obesity, type 1 diabetes, the metabolic syndrome and insulin resistance on sperm function and testosterone metabolism. Identification of pathophysiological mechanisms during childhood may open up new avenues for early prevention and treatment resulting in better reproductive outcomes and improved fertility rates during adulthood.


Assuntos
Infertilidade Masculina/etiologia , Síndrome Metabólica/complicações , Reprodução , Adolescente , Criança , Humanos , Infertilidade Masculina/patologia , Masculino
8.
Emerg Infect Dis ; 26(9): 2180-2181, 2020 09.
Artigo em Inglês | MEDLINE | ID: mdl-32818407

RESUMO

In October 2016, an adolescent boy sought care for acute genital ulceration in Cologne, Germany. We presumed a sexually transmitted infection, but initial diagnostic procedures yielded negative results. He was hospitalized because swab samples from the lesion grew toxigenic Corynebacterium diphtheriae, leading to the diagnosis of possibly sexually transmitted cutaneous diphtheria.


Assuntos
Corynebacterium diphtheriae , Difteria , Infecções Sexualmente Transmissíveis , Adolescente , Corynebacterium diphtheriae/genética , Difteria/diagnóstico , Genitália , Alemanha , Humanos , Masculino
9.
J Neurooncol ; 147(3): 577-585, 2020 May.
Artigo em Inglês | MEDLINE | ID: mdl-32246395

RESUMO

PURPOSE: Disialoganglioside GD2 is expressed by glioblastoma multiforme (GBM) cells representing a promising target for anti-GD2 immunotherapeutic approaches. The aim of the present study was to investigate anti-tumor efficacy of the chimeric anti-GD2 antibody (Ab) dinutuximab beta against GBM. METHODS: Expression levels of GD2 and complement regulatory proteins (CRP; CD46, CD55 and CD59) on well-known and newly established primary tumor originated GBM cell lines were analyzed by flow cytometry. Ab-dependent cellular (ADCC) and complement-dependent cytotoxicity (CDC) mediated by dinutuximab beta against GBM cells were determined by a non-radioactive calcein-AM-based assay. RESULTS: Analysis of primary GBM cells revealed a heterogeneous GD2 expression that varied between the cell lines analyzed with higher expression levels in the tumor surface compared to the core originated cells. Both GD2-positive and -negative tumor cells were detected in every cell line analyzed. In contrast to CDC, ADCC mediated by dinutuximab beta was observed against the majority of GBM cells. Importantly, CDC-resistant cells showed high expression of the CRP CD46, CD55 and CD59. CONCLUSION: Our present data show anti-tumor effects mediated by dinutuximab beta against GBM cells providing a rationale for a GD2-directed immunotherapy against GBM. Due to high CRP expression, a combining of GD2-targeting with CRP blockade might be a further treatment option for GBM.


Assuntos
Anticorpos Monoclonais/administração & dosagem , Antineoplásicos/administração & dosagem , Neoplasias Encefálicas/metabolismo , Neoplasias Encefálicas/terapia , Gangliosídeos/metabolismo , Glioma/metabolismo , Glioma/terapia , Imunoterapia/métodos , Neoplasias Encefálicas/imunologia , Linhagem Celular Tumoral , Regulação Neoplásica da Expressão Gênica , Glioma/imunologia , Humanos
10.
Sci Rep ; 9(1): 10319, 2019 07 16.
Artigo em Inglês | MEDLINE | ID: mdl-31311965

RESUMO

Low-dose CT has shown promise in detecting early stage lung cancer. However, concerns about the adverse health effects of radiation and high cost prevent its use as a population-wide screening tool. Effective and feasible screening methods to triage suspicious patients to CT are needed. We investigated human lung cancer metabolomics from 93 paired tissue-serum samples with magnetic resonance spectroscopy and identified tissue and serum metabolomic markers that can differentiate cancer types and stages. Most interestingly, we identified serum metabolomic profiles that can predict patient overall survival for all cases (p = 0.0076), and more importantly for Stage I cases alone (n = 58, p = 0.0100), a prediction which is significant for treatment strategies but currently cannot be achieved by any clinical method. Prolonged survival is associated with relative overexpression of glutamine, valine, and glycine, and relative suppression of glutamate and lipids in serum.


Assuntos
Biomarcadores/sangue , Neoplasias Pulmonares/mortalidade , Neoplasias Pulmonares/patologia , Metabolômica/métodos , Idoso , Feminino , Glutamina/sangue , Glicina/sangue , Humanos , Neoplasias Pulmonares/metabolismo , Espectroscopia de Ressonância Magnética/métodos , Masculino , Pessoa de Meia-Idade , Estadiamento de Neoplasias , Análise de Sobrevida , Valina/sangue
11.
Biochim Biophys Acta Mol Basis Dis ; 1864(10): 3292-3297, 2018 10.
Artigo em Inglês | MEDLINE | ID: mdl-30021121

RESUMO

OBJECTIVES: Female reproductive dysfunction occurs in patients with pathological loss of adipose tissue, i.e. lipodystrophy (LD). However, mechanisms remain largely unclear and treatment effects of adipocyte-derived leptin have not been assessed in LD animals. METHODS: In the current study, C57Bl/6 LD mice on a low-density lipoprotein receptor knockout background were treated with leptin or saline for 8 weeks and compared to non-LD controls. RESULTS: The number of pups born was 37% lower in breeding pairs consisting of LD female mice x non-LD male mice (n = 3.3) compared to LD male mice x non-LD female mice (n = 5.2) (p < 0.05). Mean uterus weight was significantly lower in the saline-treated LD group (18.8 mg) compared to non-LD controls (52.9 mg; p < 0.0001) and increased significantly upon leptin treatment (46.5 mg; p < 0.001). The mean number of corpora lutea per ovary was significantly lower in saline-treated LD animals compared to non-LD controls (p < 0.01) and was restored to non-LD control levels by leptin (p < 0.05). Mechanistically, mRNA expression of ovarian follicle-stimulating hormone receptor (p < 0.01) and estrogen receptor ß (p < 0.05), as well as of pituitary luteinizing hormone ß subunit (p < 0.001) and follicle-stimulating hormone ß subunit (p < 0.05), was significantly upregulated in LD mice compared to non-LD controls. In addition, mean time to vaginal opening as a marker of puberty onset was delayed by 12.5 days in LD mice (50.9 days) compared to non-LD controls (38.4 days; p < 0.001). CONCLUSIONS: Female LD animals show impaired fertility which is restored by leptin. Future studies should assess leptin as a subfertility treatment in human leptin-deficiency disorders.


Assuntos
Infertilidade Feminina/tratamento farmacológico , Leptina/administração & dosagem , Lipodistrofia/complicações , Receptores de LDL/genética , Animais , Cruzamento , Receptor beta de Estrogênio/genética , Feminino , Técnicas de Inativação de Genes , Humanos , Infertilidade Feminina/etiologia , Infertilidade Feminina/genética , Lipodistrofia/genética , Masculino , Camundongos , Camundongos Endogâmicos C57BL , Tamanho do Órgão , Receptores do FSH/genética , Receptores do LH/genética
12.
Obesity (Silver Spring) ; 26(7): 1161-1167, 2018 07.
Artigo em Inglês | MEDLINE | ID: mdl-29901265

RESUMO

OBJECTIVE: Obesity in females is often associated with metabolic complications and hyperandrogenism, but the sources of androgens are not completely understood. Therefore, this study investigated whether adipose tissue could be a source of androgens promoting hyperandrogenism development in obese female rats. METHODS: Gene expression of steroidogenic enzymes and testosterone levels were determined in periovarian and inguinal adipose tissue and in the supernatant of cultured preadipocytes and adipocytes. The conversion of pregnenolone to androgens was analyzed by thin-layer chromatography. RESULTS: Substantial amounts of testosterone in adipose tissue (25-153 ng/g tissue) and in the supernatant of adipocytes (0.33-0.69 ng/ten thousand cells]) were found. StAR and steroidogenic enzymes encoded by genes including Cyp11A1, Cyp17A1, Cyp19, Hsd3b2, Hsd17b3, and Srd5a2 were expressed in adipose tissue and cultured cells. Thin layer chromatography data revealed that preadipocytes and adipocytes were able to convert pregnenolone to testosterone. Higher levels for all steroidogenic enzymes were found in both depots of obese animals compared with lean animals, with significantly higher levels in inguinal tissue. CONCLUSIONS: The whole steroidogenic machinery and capacity for testosterone biosynthesis were found in fat depots of female rats. These findings support the hypothesis that adipose tissue may contribute substantially to the hyperandrogenism in female obesity.


Assuntos
Tecido Adiposo/fisiologia , Hiperandrogenismo/etiologia , Obesidade/complicações , Adipócitos/metabolismo , Tecido Adiposo/metabolismo , Androgênios/metabolismo , Animais , Células Cultivadas , Feminino , Expressão Gênica , Hiperandrogenismo/metabolismo , Lipogênese/fisiologia , Obesidade/metabolismo , Obesidade/patologia , Ratos , Ratos Endogâmicos Lew , Ratos Sprague-Dawley , Testosterona/metabolismo
14.
PLoS One ; 12(8): e0183027, 2017.
Artigo em Inglês | MEDLINE | ID: mdl-28837586

RESUMO

Nicotinamide phosphoribosyl transferase (NAMPT) is an inflammatory adipocytokine shown to interact in immune modulation in chronic inflammatory diseases, acute respiratory distress syndrome, sepsis, cancer and obesity in adulthood. It is, however, not clear whether this association reflects a chronic elevation or acute inflammatory response. We analyzed NAMPT concentrations in distinct states of inflammation in 102 children and found consistently significantly increased NAMPT levels in subjects with acute infections. NAMPT concentrations in children with stable chronic inflammatory diseases were not significantly different, whereas in patients with acute relapse of chronic disease NAMPT was significantly higher than in children in remission or healthy controls. In states of low-grade inflammation (children with atopic disease or obesity) we did not detect alterations in NAMPT serum levels. NAMPT correlated positively with inflammatory markers such as CRP. The most predictive factor for NAMPT serum concentrations was leucocyte count and therein the neutrophil count. Furthermore, systemic circulating NAMPT levels were closely associated with NAMPT release from corresponding cultured PBMCs. In conclusion, NAMPT is selectively increased in states of acute but not chronic inflammation in children. The close relationship between systemic circulating NAMPT with leucocyte counts and release indicate that leucocytes most probably are the source of inflammation related NAMPT levels.


Assuntos
Doenças Transmissíveis/enzimologia , Citocinas/sangue , Inflamação/enzimologia , Nicotinamida Fosforribosiltransferase/sangue , Adolescente , Criança , Doença Crônica , Estudos de Coortes , Doenças Transmissíveis/sangue , Feminino , Humanos , Inflamação/sangue , Masculino , Recidiva
15.
Endocrinology ; 157(6): 2461-8, 2016 06.
Artigo em Inglês | MEDLINE | ID: mdl-27105383

RESUMO

Obesity has recently been linked with reduced fertility, and the mechanisms underpinning this effect are currently unknown. The adipokine leptin is dysregulated in obesity and affects reproductive tracts; therefore, we investigated the dose-dependent effects of leptin on Leydig cell function and spermatogenesis. Eight-week-old leptin-deficient obese (ob/ob) male mice were treated with subphysiological (0.1- or 0.5-mg/kg body weight [BW]/d) or physiological (3.0-mg/kg BW/d) doses of leptin or saline for 12 weeks (chronic treatment) or 72 hours (acute treatment). We then evaluated male reproductive function markers. Mean testis weight increased significantly in the 0.1- and 3.0-mg/kg BW/d groups compared with saline controls (both P < .05). Intratesticular testosterone levels relative to testis weight significantly increased in the 0.5-mg/kg BW/d group compared with saline controls (P < .05). FSH levels increased in a dose-dependent manner with leptin treatment, whereas LH levels did not change. Leptin treatment significantly up-regulated both mRNA and protein expression of the steroidogenic enzyme cytochrome P450 17A1. Spermatogenesis improved in leptin-treated animals. Significantly more seminiferous tubules were observed in stages I-VIII (P < .01), and there were fewer abnormal seminiferous tubule structures (P < .01). Acute treatment with physiological leptin doses partially improved male reproductive markers without changing BW. Administration of subphysiological to physiological doses of leptin improves Leydig cell function and spermatogenesis.


Assuntos
Leptina/farmacologia , Testículo/efeitos dos fármacos , Animais , Ensaio de Imunoadsorção Enzimática , Hormônio Foliculoestimulante/metabolismo , Células Intersticiais do Testículo/efeitos dos fármacos , Masculino , Camundongos , Camundongos Obesos , Tamanho do Órgão/efeitos dos fármacos , Reação em Cadeia da Polimerase em Tempo Real , Túbulos Seminíferos/efeitos dos fármacos , Espermatogênese/efeitos dos fármacos , Esteroide 17-alfa-Hidroxilase/genética , Esteroide 17-alfa-Hidroxilase/metabolismo , Testosterona/metabolismo
16.
Endocrinol Metab Clin North Am ; 44(4): 761-72, 2015 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-26568491

RESUMO

Many cross-sectional analyses and longitudinal studies have examined the association between adiposity and pubertal development. In addition, the impact of an increased fat mass on reproduction and fertility in human obese men and in male animal models of obesity has been studied. A trend toward earlier pubertal development and maturation in both sexes has been shown, and the notion that obese boys might progress to puberty at a slower pace than their nonobese peers can no longer be substantiated. Impaired fertility markers and reduced reproductive functions have been observed in obesity. Obesity affects both pubertal development and fertility in men.


Assuntos
Infertilidade Masculina/etiologia , Obesidade/complicações , Humanos , Masculino
17.
PLoS One ; 10(2): e0117841, 2015.
Artigo em Inglês | MEDLINE | ID: mdl-25706927

RESUMO

Recent studies suggested the persistence of brown adipocytes in adult humans, as opposed to being exclusively present in infancy. In this study, we investigated the presence of brown-like adipocytes in adipose tissue (AT) samples of children and adolescents aged 0 to 18 years and evaluated the association with age, location, and obesity. For this, we analysed AT samples from 131 children and 23 adults by histological, immunohistochemical and expression analyses. We detected brown-like and UCP1 positive adipocytes in 10.3% of 87 lean children (aged 0.3 to 10.7 years) and in one overweight infant, whereas we did not find brown adipocytes in obese children or adults. In our samples, the brown-like adipocytes were interspersed within white AT of perirenal, visceral and also subcutaneous depots. Samples with brown-like adipocytes showed an increased expression of UCP1 (>200fold), PRDM16 (2.8fold), PGC1α and CIDEA while other brown/beige selective markers, such as PAT2, P2RX5, ZIC1, LHX8, TMEM26, HOXC9 and TBX1 were not significantly different between UCP1 positive and negative samples. We identified a positive correlation between UCP1 and PRDM16 within UCP1 positive samples, but not with any other brown/beige marker. In addition, we observed significantly increased PRDM16 and PAT2 expression in subcutaneous and visceral AT samples with high UCP1 expression in adults. Our data indicate that brown-like adipocytes are present well beyond infancy in subcutaneous depots of non-obese children. The presence was not restricted to typical perirenal locations, but they were also interspersed within WAT of visceral and subcutaneous depots.


Assuntos
Adipócitos Marrons/citologia , Adipócitos/citologia , Tecido Adiposo Marrom/citologia , Tecido Adiposo Branco/citologia , Adipócitos/metabolismo , Adipócitos Marrons/metabolismo , Tecido Adiposo Marrom/metabolismo , Tecido Adiposo Branco/metabolismo , Adolescente , Adulto , Sistemas de Transporte de Aminoácidos Neutros/genética , Sistemas de Transporte de Aminoácidos Neutros/metabolismo , Índice de Massa Corporal , Criança , Pré-Escolar , Proteínas de Ligação a DNA/genética , Proteínas de Ligação a DNA/metabolismo , Feminino , Humanos , Imuno-Histoquímica , Lactente , Recém-Nascido , Gordura Intra-Abdominal/citologia , Gordura Intra-Abdominal/metabolismo , Canais Iônicos/genética , Canais Iônicos/metabolismo , Masculino , Proteínas Mitocondriais/genética , Proteínas Mitocondriais/metabolismo , Obesidade , Sobrepeso , Reação em Cadeia da Polimerase Via Transcriptase Reversa , Gordura Subcutânea/citologia , Gordura Subcutânea/metabolismo , Simportadores/genética , Simportadores/metabolismo , Fatores de Transcrição/genética , Fatores de Transcrição/metabolismo , Proteína Desacopladora 1
18.
J Clin Endocrinol Metab ; 100(4): 1289-99, 2015 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-25625801

RESUMO

RATIONALE: The newly discovered myokine irisin has been proposed to affect obesity and metabolism by promoting browning of white adipose tissue. However, clinical and functional studies on the association of irisin with obesity, muscle mass, and metabolic status remain controversial. Here we assessed the effect of 4 distinct exercise regimens on serum irisin levels in children and young adults and systematically evaluated the influence of diurnal rhythm, anthropometric and metabolic parameters, and exercise on irisin. RESULTS: Serum irisin levels did not show diurnal variations, nor were they affected by meal intake or defined glucose load during oral glucose tolerance testing. Irisin levels decreased with age. In adults, irisin levels were higher in men than in women, and obese subjects had significantly higher levels than lean control subjects. Irisin levels were closely correlated with muscle-associated bioimpedance parameters such as fat-free mass and body cell mass. Of the 4 exercise regimens that differed in duration and intensity, we identified a clear and immediate increase in serum irisin levels after acute strenuous exercise (cycling ergometry) and a 30-minute bout of intensive exercise in children and young adults, whereas longer (6 weeks) or chronic (1 year) increases in physical activity did not affect irisin levels. SUMMARY: We show that irisin levels are affected by age, sex, obesity, and particularly muscle mass, whereas diurnal rhythm and meals do not contribute to the variation in irisin levels. Short bouts of intensive exercise but not long-term elevations in physical activity, acutely and transiently increase serum irisin levels in children and adults.


Assuntos
Exercício Físico/fisiologia , Fibronectinas/sangue , Obesidade Infantil/sangue , Adolescente , Adulto , Fatores Etários , Criança , Ritmo Circadiano , Feminino , Glucose/farmacologia , Humanos , Hidrocortisona/sangue , Masculino , Refeições , Metaboloma/efeitos dos fármacos , Obesidade Infantil/terapia , Esforço Físico/fisiologia , Fatores Sexuais , Adulto Jovem
19.
Diabetes ; 64(4): 1249-61, 2015 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-25392242

RESUMO

Accumulation of fat mass in obesity may result from hypertrophy and/or hyperplasia and is frequently associated with adipose tissue (AT) dysfunction in adults. Here we assessed early alterations in AT biology and function by comprehensive experimental and clinical characterization of 171 AT samples from lean and obese children aged 0 to 18 years. We show an increase in adipocyte size and number in obese compared with lean children beginning in early childhood. These alterations in AT composition in obese children were accompanied by decreased basal lipolytic activity and significantly enhanced stromal vascular cell proliferation in vitro, potentially underlying the hypertrophy and hyperplasia seen in obese children, respectively. Furthermore, macrophage infiltration, including the formation of crown-like structures, was increased in AT of obese children from 6 years on and was associated with higher hs-CRP serum levels. Clinically, adipocyte hypertrophy was not only associated with leptin serum levels but was highly and independently correlated with HOMA-IR as a marker of insulin resistance in children. In summary, we show that adipocyte hypertrophy is linked to increased inflammation in AT in obese children, thereby providing evidence that obesity-associated AT dysfunction develops in early childhood and is related to insulin resistance.


Assuntos
Tecido Adiposo/fisiopatologia , Inflamação/fisiopatologia , Resistência à Insulina/fisiologia , Obesidade/fisiopatologia , Adipócitos/metabolismo , Tecido Adiposo/metabolismo , Adolescente , Glicemia , Diferenciação Celular , Proliferação de Células/fisiologia , Criança , Pré-Escolar , Feminino , Humanos , Lactente , Recém-Nascido , Inflamação/metabolismo , Insulina/sangue , Leptina/sangue , Macrófagos/metabolismo , Masculino , Obesidade/metabolismo
20.
J Pediatr Endocrinol Metab ; 27(11-12): 1043-7, 2014 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-25367688

RESUMO

BACKGROUND: Cushing's disease is very rare in children, and the diagnosis is frequently delayed by several years. OBJECTIVE: We report a case of prepubertal Cushing's disease with a medical history of only 9 months. This case illustrates the difficulties involved in diagnosing children at the early stage of the disease. CASE PRESENTATION: An 8-year-old prepubertal boy presented with rapid weight gain accompanied by a decreasing growth velocity and hirsutism. Thyroid function tests and growth factor levels were normal, thus excluding hypothyroidism and growth hormone deficiency. Cushing's syndrome was confirmed by elevated 24-h urinary free cortisol levels, increased diurnal cortisol levels, and a lack of cortisol suppression in the low-dose dexamethasone suppression test. Further tests to investigate the source of the hypercortisolism showed the following results: Basal morning adrenocorticotropic hormone (ACTH) was normal. The high-dose dexamethasone suppression test led to a 51% decrease in cortisol level. In the corticotropin-releasing hormone (CRH) test, ACTH and cortisol increased only by 28%. Repeated magnetic resonance imaging (MRI) finally revealed a microadenoma in the anterior pituitary, thus establishng the diagnosis of Cushing's disease. Upon diagnosis, the patient underwent transsphenoidal surgery. Histological analysis confirmed an ACTH-secreting pituitary adenoma. CONCLUSION: This case illustrates the difficulties associated with the clinical, biochemical, and radiological diagnoses of Cushing's disease in children. Early diagnosis remains a challenge because test results often do not match standard diagnostic criteria.


Assuntos
Adenoma Hipofisário Secretor de ACT/diagnóstico , Adenoma/diagnóstico , Síndrome de Cushing/diagnóstico , Adenoma Hipofisário Secretor de ACT/sangue , Adenoma Hipofisário Secretor de ACT/cirurgia , Adenoma/sangue , Adenoma/cirurgia , Hormônio Adrenocorticotrópico/sangue , Criança , Hormônio Liberador da Corticotropina/sangue , Síndrome de Cushing/sangue , Síndrome de Cushing/cirurgia , Diagnóstico Precoce , Humanos , Hidrocortisona/sangue , Imageamento por Ressonância Magnética , Masculino , Puberdade
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