Swyer syndrome presenting as dysgerminoma: A case report / Journal of the ASEAN Federation of Endocrine Societies

@#Complete gonadal dysgenesis with 46,XY karyotype is a clinical condition characterized by the absence of testicular tissue but typical Mullerian structures in a phenotypically female individual. The condition presents as primary amenorrhoea or delayed puberty. Eventually, malignant neoplasms may arise. We report a case of a 16-year-old patient with Swyer syndrome presenting with primary amenorrhoea and with previous diagnosis four years earlier of a malignant dysgerminoma in the right ovary.

Nueva variante del gen STAG3 causante de insuficiencia ovárica prematura / New STAG3 gene variant as a cause of premature ovarian insufficiency

RESUMEN Objetivos: describir un caso de falla ovárica secundaria a una variante patogénica homocigota en el gen STAG3 no reportada previamente. Materiales y métodos: paciente de 16 años con amenorrea primaria y ausencia de características sexuales secundarias, en quien se documentó hipotiroidismo autoinmune, pobre desarrollo genital y cintilla gonadal, por lo cual se realizó secuenciación de exorna clínico. Se identificó una variante homocigota patogénica previamente no reportada en el gen STAG3, el cual ha sido relacionado con insuficiencia ovárica prematura (IOP). Conclusiones: en este caso, la realización de exorna clínico fue determinante para identificar una alteración del gen STAG, probablemente asociada a la IOP y el pronóstico a largo plazo de la paciente. Se establece una nueva variante patogénica c.2773delT; p.Ser925Profs*6 del gen STAG3 asociada a la IOP.

ABSTRACT Objectives: To describe a case of ovarian failure secondary to a homozygous pathogenic variant in the STAG3 gene not previously reported. Material and methods: A 16-year-old patient with primary amenorrhea and absence of secondary sexual characteristics, with documented autoimmune hypothyroidism, poor genital and gonadal streak development which prompted the performance of clinical exorne sequencing. A homozygous pathogenic variant not previously reported in the STAG3 gene, which has been associated with premature ovarian insufficiency (POI), was identified. Conclusions: In this case, clinical exorne sequencing was key for identifying a STAG gene abnormality, probably associated with POI and long term prognosis for the patient. A new pathogenic variant c.2773delT; p.Ser925Profs*6 of the STAG3 gene associated with POI was established.

Gonadoblastoma bilateral em paciente com mosaicismo de síndrome de Turner: relato de caso e revisão de literatura / Bilateral gonadoblastoma in patient with Turner syndrome mosaicism: case report and literature review

A síndrome de Turner decorre de uma anomalia dos cromossomos sexuais, afetando cerca de 1:2.500 nascidos vivos. A síndrome caracteriza-se principalmente por atraso do e denvolvimento dos caracteres sexuais e/ou amenorreia e baixa estatura. Entretanto, uma diversidade de estigmas também pode estar presente. O diagnóstico pode ser realizado com base nos estigmas da síndrome associados a um quadro de hipogonadismo hipergonadotrófico e confirmado por meio do cariótipo ­ sendo esse classicamente 45,X (monossomia do cromossomo X). Entretanto, os mosaicos (45,X/46,XY ou 45,X/46,XX) podem representar 34% a 75% dos casos, dependendo do método de análise utilizado. Trata-se de uma condição rara correspondendo a 5% das disgenesia gonadais e apresenta um amplo espectro fenotípico. A importância da identificação de mosaicos, especialmente a presença do cromossomo Y, reside no manejo adequado da gônada disgenética para a prevenção da ocorrência de tumor gonadal, principalmente o gonadoblastoma, com considerável potencial maligno.(AU)

Turner's syndrome results from a sex chromosomes anomaly, affecting about 1:2,500 live births. The syndrome is characterized mainly by delayed development of sexual characteristics and/or amenorrhea and short stature. However, a variety of stigmas may also be presented. The diagnosis can be made based on the stigmas of the syndrome associated with a hypergonadotrophic hypogonadism and confirmed by the karyotype ­ this being classically 45, X (monosomy of the X chromosome). However, mosaics (45,X/46,XY or 45,X/46, XX) may represent 34% to 75% of cases depending on the method of analysis used. It is a rare condition, corresponding to 5% of gonadal dysgenesis and presents a broad phenotypic spectrum. The importance of mosaic identification, especially the presence of the Y chromosome, lies in the proper management of the dysgenetic gonad for the prevention of the occurrence of gonadal tumor, especially gonadoblastoma, with considerable malignant potential.(AU)

Abordaje del recién nacido con alteraciones del desarrollo sexual / Newborn approach with disorders of sexual development

Resumen Introducción: Las alteraciones del desarrollo sexual en el recién nacido no es una condición infrecuente durante la práctica médica pero sí resulta ser un reto tanto en el abordaje diagnostico como en el terapéutico. Se definen como el conjunto de condiciones en donde el desarrollo del sexo cromosómico, gonadal o anatómico es atípico. Objetivos: Realizar un abordaje integral de las alteraciones del desarrollo sexual y reconocer la importancia de los equipos transdisciplinarios para el manejo de esta patología. Metodología: Se realizó una búsqueda de la literatura con las palabras clave Disorders of sex development, Ovotesticular disorders of sex development, True Hermaphroditism, Gonadal dysgenesis, Adrenal hyperplasia, congenital en cinco bases de datos bibliográficas, se limitó la búsqueda para artículos en idioma español o inglés de los últimos 10 años. Resultados: Se obtuvieron110 artículos de los cuales 36 fueron incluidos en esta revisión, los artículos revisados eran artículos originales, presentación de casos, consensos y artículos de revisión. Conclusiones: La sensibilización al personal de salud sobre esta condición es fundamental para realizar un diagnóstico y tratamiento oportuno, con el objetivo de evitar complicaciones en la salud del recién nacido. La asignación del sexo es uno de los problemas más relevantes para el manejo de esta patología; esta decisión deberá ser tomada por el equipo transdisciplinario de especialistas con experiencia en el tema en donde se realice una evaluación detallada e individual de cada caso.

Abstract Introduction: Disorder of sexual development in newborn is not an infrequent condition during medical practice, but it does prove to be a challenge both in diagnostic and in therapeutic approaches. It is defined as the set of conditions in which the development of chromosomal, gonadal or anatomical sex is atypical. Objectives: To carry out a comprehensive approach to sexual development alterations and to recognize the importance of transdisciplinary teams for the management of this pathology. Methodology: A search of review literature was made with the key words Disorders of sex development, Ovotesticular disorders of sex development, true hermaphroditism, gonadal dysgenesis, and congenital adrenal hyperplasia in five biomedical databases. The search has been limited to Spanish or English language articles of the last 10 years. Results: 110 articles were reviewed, of which 36 were included, they were original articles, case presentations, consensus and review articles. Conclusions: In order to avoid complications in newborn, health personnel should be sensitized, regarding this condition is essential to timely diagnosis and treatment. Assignment of sex is one of the most relevant problems for the management of this condition; this decision must be made by a transdisciplinary team of specialists with experience in the subject where a detailed and individual evaluation of each case is carried out.

Síndrome de Frasier en una adolescente: asociación con disgenesia gonadal y enfermedad renal crónica / Frasier Syndrome in an adolescent: association to gonadal dysgenesis and renal chronic disease

Se describe el caso clínico de una adolescente de 16 años de edad, con aparente buen estado de salud, quien había sido atendida desde hacía 3 años aproximadamente en la consulta de Pediatría por presentar falta de desarrollo puberal, amenorrea primaria, así como aumento de volumen en miembros inferiores. Se le realizaron los exámenes complementarios pertinentes y dado el conjunto de elementos clínicos que presentaba, incluida una proteinuria significativa asociada a dismorfismos corporales e hipogenitalismo, se consultó el caso con un equipo multidisciplinario, integrado por nefrólogos, endocrinólogos, genetistas y psicólogos. Se le diagnosticó el síndrome de Frasier, como una asociación síndrome nefrótico-disgenesia gonadal.

The case report of a 16 years adolescent with apparent good health state who had been attended approximately for 3 years in the Pediatrics service to present lack of puberal changes, primary amenorrhoea, as well as increase of volume in lower members is described. The pertinent and complementary examinations were carried out and taking into account the group of clinical elements she presented, including a significant proteinuria associated with corporal dysmorfisms and hypogenitalism, the case was exposed to a multidisciplinary team, formed by nephrologists, Endocrinology specialists, geneticists and psychologists. Frasier syndrome was diagnosed, associated to nephrotic syndrome and gonadal dysgenesis.

Swyer syndrome: A case of primary amenorrhea in an 18-year-old with gonadal mixed germ cell tumor / Philippine Journal of Obstetrics and Gynecology

@#<p>An 18-year-old, G0, with primary amenorrhea consulting because of a rapidly enlarging abdominal mass was diagnosed with Swyer syndrome or 46 XY pure gonadal dysgenesis and subsequently underwent staging laparotomy for mixed germ cell tumor (dysgerminoma and yolk sac tumor) arising from her dysgenetic gonad. Bleomycin, etoposide, cisplatin regimen for three to four cycles was planned but the patient was lost to follow-up. A prompt evaluation of her amenorrhea and a timely gonadectomy could have averted the development of malignancy.</p>

Evaluation and management of amenorrhea related to congenital sex hormonal disorders

Primary amenorrhea is a symptom with a substantial list of underlying etiologies which presents in adolescence, although some conditions are diagnosed in childhood. Primary amenorrhea is defined as not having menarche until 15 years of age (or 13 years with secondary sex characteristics). Various etiologies of primary amenorrhea include outflow tract obstructions, gonadal dysgenesis, abnormalities of the central nervous system, various endocrine diseases, chronic illnesses, psychologic problems, and constitutional delay of puberty. The management of primary amenorrhea may vary considerably depending on the patient and the specific diagnosis. In this article, the various causes, evaluation, and management of primary amenorrhea are reviewed with special emphasis on congenital sex hormonal disorders.

Pubertal outcomes and sex of rearing of patients with ovotesticular disorder of sex development and mixed gonadal dysgenesis

PURPOSE: Patients with ovotesticular disorder of sex development (DSD) and mixed gonadal dysgenesis (MGD) usually present with asymmetric gonads and have wide phenotypic variations in internal and external genitalia. The differential diagnosis of these conditions is based on karyotype and pathological findings of the gonads. This study investigated the clinical features at presentation, karyotype, sex of rearing, and pubertal outcomes of patients with ovotesticular DSD and MGD.METHODS: The study comprised 23 patients with DSD who presented with asymmetric gonads. The presenting features, karyotype, sex of rearing, and pubertal outcomes were reviewed retrospectively.RESULTS: All 23 patients presented with ambiguous genitalia at a median age of 1 month (range, 1 day–1.6 years). Müllerian duct remnants were identified in 15 of 23 patients (65.2%). Fourteen patients were diagnosed with ovotesticular DSD, whereas the other 9 were diagnosed with MGD. Eight of 14 patients (57.1%) with ovotesticular DSD were raised as males, while 7 of 9 patients with MGD (77.8%) were assigned as males. One male-assigned patient with ovotesticular DSD changed to female sex at age 20 years.CONCLUSION: Patients with ovotesticular DSD and MGD manifest overlapping clinical presentations and hormonal profiles. It is difficult to determine the sex of rearing and predict long-term pubertal outcomes. Therefore, long-term follow-up is required to monitor spontaneous puberty, sex outcome, and urological and gynecological complications.

Germ cell tumors in dysgenetic gonads

This review describes the germ cell neoplasms that are malignant and most commonly associated with several types of gonadal dysgenesis. The most common neoplasm is gonadoblastoma, while others including dysgerminomas, yolk-sac tumors and teratomas are rare but can occur. The purpose of this review is to evaluate the incidences of these abnormalities and the circumstances surrounding these specific tumors. According to well-established methods, a PubMed systematic review was performed, to obtain relevant studies published in English and select those with the highest-quality data. Initially, the first search was performed using gonadal dysgenesis as the search term, resulting in 12,887 PubMed papers, published, from 1945 to 2017. A second search using ovarian germ cell tumors as the search term resulted in 10,473 papers, published from 1960 to 2017. Another search was performed in Medline, using germ cell neoplasia as the search term, and this search resulted in 7,560 papers that were published between 2003 to 2016, with 245 new papers assessing gonadoblastomas. The higher incidence of germ cell tumors in gonadal dysgenesis is associated with a chromosomal anomaly that leads to the absence of germ cells in these gonads and, consequently, a higher incidence of neoplasms when these tumors are located inside the abdomen. Several hypotheses suggest that increased incidence of germ cell tumors involves all or part of the Y chromosome or different genes.

Actualización en el manejo del síndrome de Turner en niñas y adolescentes: revisión de la literatura e Incorporación de recomendaciones de las nuevas guías clínicas / Update on the management of Turner syndrome in girls and adolescents: review of the literature and incorporation of recommendations of the new clinical guidelines

Turner syndrome (TS) is a common disorder (1/2.000 women) that affects multiple organs at different stages of life and needs a multidisciplinary approach. It can be present in women of all ethnicities and is caused by a monosomy of the X chromosome that causes a haploinsufficiency of certain genes. Its main features consist of specific but variables physical characteristics, congenital heart defects, renal anomalies, middle and inner ear diseases, skeletal alterations, and from the endocrinological point of view, short stature and ovarian insufficiency. Given the comorbidities associated with TS, it has been estimated that they have an increased risk of mortality (up to 3 times more) and a reduction in life expectancy of approximately 13 years. Depending on the genotype, the abnormalities can become very subtle, in these cases the diagnosis is late, when the adolescent consults, for example, for primary amenorrhea or an adult woman for infertility. Once the diagnosis is confirmed by a karyotype, these patients must remain in pediatric control in a continuous way to investigate associated pathologies in a timely manner, with periodic evaluations by specialists, such as otolaryngologists, cardiologists, neurologists and endocrinologists, among others. Numerous advances in the care of these patients gave rise to new guidelines published in 2017. In this article we will comment on the main conditions associated with TS and its specific etiology, we will mention what is relevant regarding the genotype-phenotype relationship in this syndrome and we will discuss the fundamental aspects of the control of the TS patient, with emphasis on the treatment of short stature and ovarian insufficiency, as well as the cardiovascular aspects and those related to fertility.

El Síndrome de Turner (ST) es una patología frecuente (1/2.000 mujeres) que afecta múltiples órganos en distintas etapas de la vida y necesita un enfoque multidisciplinario. Se produce por una monosomía del cromosoma X que provoca una haploinsuficiencia de determinados genes. Sus características principales consisten en un fenotipo característico pero variable, con presencia de cardiopatías congénitas, anomalías renales, enfermedades del oído medio e interno, alteraciones esqueléticas, y del punto de vista endocrinológico, talla baja e insuficiencia ovárica. Dadas las comorbilidades asociadas al ST, principalmente cardiovasculares (CV), presentan mayor mortalidad con respecto a la población general (hasta 3 veces más). Dependiendo del genotipo, las anomalías pueden llegar a ser muy sutiles, realizándose en estos casos el diagnóstico en forma tardía, cuando la adolescente consulte, por ejemplo, por amenorrea primaria o una mujer adulta por infertilidad. Una vez confirmado el diagnóstico mediante un cariotipo, estas pacientes deben permanecer en control endocrinológico pediátrico en forma continua hasta la transición hacia adultos, con el fin de pesquisar patologías asociadas en forma oportuna. Por ello requieren evaluaciones periódicas por especialistas, tales como otorrinolaringólogos, cardiólogos, neuropsiquiatras, entre otros. Numerosos avances en el cuidado de estas pacientes, dieron origen a nuevas guías publicadas el 2017. En este artículo comentaremos sobre las principales condiciones asociadas al ST y su etiología específica, mencionaremos lo relevante respecto a la relación genotipo-fenotipo en este síndrome y discutiremos los aspectos fundamentales del control de la paciente con ST, haciendo énfasis en el tratamiento de la talla baja y la insuficiencia ovárica, así como los aspectos CV y los relacionados a fertilidad.

Genes associated with testicular germ cell tumors and testicular dysgenesis in patients with testicular microlithiasis / 亚洲男科学杂志(英文版)

Testicular microlithiasis (TM) is one of the symptoms of testicular dysgenesis syndrome (TDS). TM is particularly interesting as an informative marker of testicular germ cell tumors (TGCTs). KIT ligand gene (KITLG), BCL2 antagonist/killer 1 (BAK1), and sprouty RTK signaling antagonist 4 (SPRY4) genes are associated with a high risk of TGCTs, whereas bone morphogenetic protein 7 gene (BMP7), transforming growth factor beta receptor 3 gene (TGFBR3), and homeobox D cluster genes (HOXD) are related to TDS. Using polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) analysis, we investigated allele and genotype frequencies for KITLG (rs995030, rs1508595), SPRY4 (rs4624820, rs6897876), BAK1 (rs210138), BMP7 (rs388286), TGFBR3 (rs12082710), and HOXD (rs17198432) in 142 TGCT patients, 137 TM patients, and 153 fertile men (control group). We found significant differences in the KITLG GG_rs995030 genotype in TM (P = 0.01) and TGCT patients (P = 0.0005) compared with the control. We also revealed strong associations between KITLG_rs1508595 and TM (G allele, P = 0.003; GG genotype, P = 0.01) and between KITLG_rs1508595 and TGCTs (G allele, P = 0.0001; GG genotype, P = 0.0007). Moreover, there was a significant difference in BMP7_rs388286 between the TGCT group and the control (T allele, P = 0.00004; TT genotype, P = 0.00006) and between the TM group and the control (T allele, P = 0.04). HOXD also demonstrated a strong association with TGCTs (rs17198432 A allele, P = 0.0001; AA genotype, P = 0.001). Furthermore, significant differences were found between the TGCT group and the control in the BAK1_rs210138 G allele (P = 0.03) and the GG genotype (P = 0.01). KITLG and BMP7 genes, associated with the development of TGCTs, may also be related to TM. In summary, the KITLG GG_rs995030, GG_rs1508595, BMP7 TT_rs388286, HOXD AA_rs17198432, and BAK1 GG_rs210138 genotypes were associated with a high risk of TGCT development.

Clinical and genetic features of 45,X maleness: A case report and review of the literature / 中华男科学杂志

Objective@#To explore the relationship between the clinical and genetic features of a short-statured azoospermia male with the karyotype of 45,X.@*METHODS@#Using GTG-banded chromosome analysis, we performed karyotyping for a 150 cm-high infertile male with azoospermia and investigated the presence and location of the genes on the Y chromosome by FISH and PCR.@*RESULTS@#GTG-banded chromosome analysis showed the karyotype of the patient to be 45,X,add(14)(p11). The results of PCR manifested the deletion of AZFa, AZFb, AZFc, and AZFd in the SRY gene. FISH revealed the translocation of the short arm of the Y chromosome to that of chromosome 14 and deletion of most proportions of its long arm, with the disruption site close to the centromere region. The karyotype of the patient was 45,X,der(Y)t(Y;14)(q11;q11.2), 14.ish (SRY+, CEP Y+ , DYZ1－).@*CONCLUSIONS@#The karyotype of the patient was unbalanced Y/14 translocation. The SRY gene is the key to maleness. The deletion of AZFa－ d induces spermatogenic disturbance, and the deletion of the q arm of the Y chromosome may be related with short stature.

46, XY Partial Gonadal Dysgenesis diagnosed in adulthood

@#Partial Gonadal Dysgenesis (PGD) is a rare disorder of sexual development defined by sexual ambiguity and the presence of mullerian structures due to variable degrees of testicular dysgenesis in individuals with a non-mosaic 46, XY karyotype. Due to incomplete gonadal development, the external phenotype would rely on the degree of testicular function. The dysgenetic gonads found in PGD have high risk for malignant transformation. Although ambiguous genitalia was noted upon birth, a case diagnosed in adulthood is presented. Discordance between sex of rearing and the psychosexuality of the patient prompted consult. On work up, 46, XY was noted on karyotyping but presence of a uterus was seen on ultrasound. Hormonal assay revealed elevated levels of FSH and LH, while testosterone levels were low and estradiol was high. Gonadoblastoma was noted on final histopathologic evaluation. This report shall tackle thorough preoperative evaluation, surgical and postoperative management of individuals with PGD.

Female with 46, XY karyotype

Disorders of sex development (DSD) are congenital conditions characterized by atypical development of chromosomal, gonadal, and phenotypic sex. 46, XY DSD can result from disorders of testicular development or disorders of androgen synthesis/action. Prophylactic gonadectomy should be considered in patients with 46, XY DSD because of the increased risk of gonadal malignancy. We report two rare cases of 46, XY DSD, including XY pure gonadal dysgenesis and complete androgen insensitivity syndrome, who underwent a prophylactic gonadectomy.

Anomalias do desenvolvimento sexual / Abnormalities of sexual development

As anormalidades da diferenciação sexual são infrequentes na prática clínica. A caracterização de uma ampla variedade de síndromes tem sido muitas vezes confusa, necessitando, com relativa frequência, a consulta de múltiplos livros e uso constante de referências para uma correta compreensão. O presente artigo tem a proposta de revisar as entidades mais frequentes, seus métodos diagnósticos e sua conveniente orientação.(AU)

Abnormal sexual differentiation is not frequently seen in an individual clinician's practice. The categories of many syndromes in this area require special and constant references to review many papers and books to understand these abnormalities. In this paper, the most frequent syndromes are described, and their diagnostic methods and proposals for correct orientation are provided.(AU)

The XY female: A rare case of Swyer syndrome with dysgerminoma

Swyer Syndrome is a pure form of gonadal dysgenesis that although rare, should not be disregarded in the differential diagnosis of patients who present with primary amenorrhea and abdominopelvic mass. The dysgenetic gonads fail to produce antimullerian hormone in an individual with Swyer Syndrome who is genetically male, resulting in feminization and absence of virilization. Phenotypically female, they usually seek consult at a later time during their teenage years due to primary amenorrhea. Our index patient consulted due to a large abdominopelvic mass and primary amenorrhea. Hormonal assay showed a hypergonadotropic hypogonadism endocrinologic milieu, and on karyotyping, showed a genetically male individual. This paper shall discuss an in-depth pre-operative, surgical and post-operative management of patients diagnosed with Swyer Syndrome.

Turner syndrome presented with tall stature due to overdosage of the SHOX gene

Turner syndrome is one of the most common chromosomal disorders. It is caused by numerical or structural abnormalities of the X chromosome and results in short stature and gonadal dysgenesis. The short stature arises from haploinsufficiency of the SHOX gene, whereas overdosage contributes to tall stature. This report describes the first Korean case of Turner syndrome with tall stature caused by SHOX overdosage. The patient presented with primary amenorrhea and hypergonadotropic hypogonadism at the age of 17 years. Estrogen replacement therapy was initiated at that time. She displayed tall stature from childhood, with normal growth velocity, and reached a final height of 190 cm (standard deviation score, 4.3) at the age of 30 years. Her karyotype was 46,X, psu idic(X)(q21.2), representing partial monosomy of Xq and partial trisomy of Xp. Analysis by multiplex ligation-dependent probe amplification detected a duplication at Xp22.3-Xp22.2, encompassing the PPP2R3 gene near the 5'-end of the SHOX gene through the FANCD gene at Xp22.2.

Complete duplication of the urinary bladder: an extremely rare congenital anomaly

A case of complete bladder duplication with urethra duplication, diphallus, anorectal malformation and rightsided renal agensis with ipsilateral gonadal agenesisis was reported because of its rarity. Possible deranged embryology resulting in these anomalies has been reviewed with relevant hypothesis. The patient underwent several investigations and undergoing multistage surgical intervention

Causes of amenorrhea in Korea: Experience of a single large center / 대한생식의학회지

OBJECTIVE: To investigate the causes of amenorrhea in Korean women. METHODS: Medical records from 1,212 women with amenorrhea who visited the Department of Obstetrics and Gynecology, Asan Medical Center, between January 1989 and December 2011 were retrospectively reviewed. Amenorrhea was categorized as either primary or secondary. RESULTS: Primary amenorrhea was identified in 132 of the patients (10.9%) and secondary amenorrhea in 1,080 (89.1%). The most frequent causes of primary amenorrhea were gonadal dysgenesis (28.0%, 37/132); Mayer-Rokitansky-Kuster-Hauser syndrome (20.0%, 27/132); and constitutional delay and androgen insensitivity syndrome (8.3%, 11/132; 8.3%, 11/132, respectively). Secondary amenorrhea was due to polycystic ovary syndrome (48.4%, 523/1,080); premature ovarian insufficiency (14.0%, 151/1,080); and nutrition-related hypogonadotropic hypogonadism (8.3%, 90/1,080). CONCLUSION: In this retrospective study, gonadal dysgenesis was the most common cause of primary amenorrhea and polycystic ovary syndrome was the most common cause of secondary amenorrhea in Korean women.

Study on the mechanism of di-2-ethylhexyl phthalate and cypermethrin inducing gonadal dysgenesis in the prepubertal male rats / 中华劳动卫生职业病杂志

<p><b>OBJECTIVE</b>To investigate the mechanism of di-2-ethylhexyl phthalate (DEHP) and cypermethrin (CYP) inducing gonadal dysgenesis in prepubertal male rats.</p><p><b>METHODS</b>A total of 40 healthy 3-week-old specific pathogen-free male Sprague-Dawley rats were randomly and equally divided into four groups: control group (corn oil), DEHP group (500 mg/kg, dissolved in corn oil), CYP group (80 mg/kg, dissolved in corn oil), and combined exposure group (exposed to 500 mg/kg DEHP and 80 mg/kg CYP, dissolved in corn oil). Rats were treated by gavage administration once a day for 30 days. Twenty-four hours after the last exposure, the animals were sacrificed. The body weight and the wet weight of testis were determined, and the weight coefficient of testis was calculated. Radioimmunoassay was used to determine serum testosterone level. Ultrastructural-level histopathological changes of the testis were examined by transmission electron microscopy. The mRNA and protein expression of follicle stimulating hormone receptor (FSHR), androgen binding protein (ABP), inhibin beta-B (INHBB) and vimentin (VIM) were analyzed by real-time PCR and Western blot, respectively. Factorial design analysis of variance was used to compare differences between groups; interaction diagrams were used to determine the interaction between DEHP and CYP.</p><p><b>RESULTS</b>Compared with those of the control group, the testis weights and testis coefficients of the DEHP, CYP, and combined exposure groups significantly decreased by 39.3-59.2%and 19.7-58.6%, respectively, and all exposure groups showed significant reductions in serum level of testosterone, ranging from 49.1% to 62.7% (P < 0.05 or P < 0.01). And all the exposure groups showed different levels of ultrastructural damages in the testes. Compared with that in the control group, the mRNA expression of FSHR, ABP, INHBB, and VIMin the DEHP group was down-regulated by 1.72, 2.64, 2.83 and 1.79 times, and their protein levels were significantly reduced by 65.2%, 53.7%, 70.1%, and 51.9% (P < 0.05 or P < 0.01). Significant decreases in mRNA expression of ABP (down 1.72 times) and INHBB (down 2.06 times) were observed in the CYP group, and their protein levels decreased by 38.3% and 49.7%, respectively (P < 0.05). The combined exposure to both DEHP and CYP resulted in big decreases in the mRNA levels of FSHR (down 1.62 times), ABP (down 2.00 times), INHBB (down 2.35 times), and VIM (down 1.54 times) and protein levels of FSHR (down 52.1%), INHBB (down 53.9%), and VIM (down 58.8%) (P < 0.05). Factorial design analysis of variance showed that the combination of two substances had an antagonistic effect on the expression of ABP and INHBB (P < 0.05).</p><p><b>CONCLUSION</b>DEHP and CYP, alone or combined, can lead to gonadal dysgenesis in prepubertal male rats. Both of them can disrupt functional mRNA and protein expression in Sertoli cells to certain levels. The combination of DEHP and CYP shows antagonistic effects, and DEHP has a stronger reproductive toxicity than CYP.</p>