Endocrine Abstracts

Background: Klinefelter syndrome (KS) is the most frequent genetic cause of male infertility. Individuals share the endocrine hallmark of hypergonadotropic hypogonadism, displaying high gonadotropin levels due to deficient testicular function. A single-nucleotide polymorphism (SNP) located within the FSHB promoter region (−211G>T, rs10835638) was recently shown to be associated with reduced serum FSH levels and other reproductive parameters in men. The objec...

Sertoli cell-only syndrome (SCOS) is characterized by a lack of germ cells and thickened seminiferous tubule walls and is a frequent finding among men with non-obstructive azoospermia. Spermatogenesis is dependent upon the function and number of Sertoli cells (SC) to support the developing germ cells. Klinefelter syndrome is the most frequent genetic cause of SCOS and presents histological features in common with idiopathic SCOS. Aim of this study was to analyze the relationsh...

Intratesticular testosterone levels in Klinefelter syndrome (KS) are comparable to controls and Leydig cell function was proven to be normal at least in vitro, testicular vascularization changes came into focus as a potential factor contributing to hypogonadism. We performed enhanced ultrasound based analysis of the testicular blood support in our 41,XXY* mice. Adult male 41,XXY* (n=5) and control mice (n=6) underwent ultrasound...