Hypogonadism and Testosterone Replacement Therapy

2005 ◽  
Vol 00 (01) ◽  
pp. 75
Author(s):  
Adrian S Dobs
Keyword(s):  
Bone Mass ◽  
Sexual Function ◽  
Replacement Therapy ◽  
External Genitalia ◽  
Testosterone Replacement Therapy ◽  
Male Hypogonadism ◽  
Secondary Sexual Characteristics ◽  
The Us ◽  
Sexual Characteristics ◽  
Normal Spermatogenesis

Male hypogonadism affects an estimated four to five million men in the US. It is defined as failure of the testes to produce an adequate amount of testosterone and/or conduct normal spermatogenesis. The production of adequate amounts of testosterone is necessary for development of external genitalia and development of secondary sexual characteristics in children and adolescents. In adults, androgen production is necessary for maintenance of lean body mass (LBM), bone mass, libido, sexual function, and spermatogenesis.

scholarly journals A Case of Male Osteoporosis: A 37-Year-Old Man with Multiple Vertebral Compression Fractures

2017 ◽  
Vol 2017 ◽  
pp. 1-7
Author(s):  
Suhaib Radi ◽  
Andrew C. Karaplis
Keyword(s):  
Bone Mass ◽  
Replacement Therapy ◽  
Fragility Fractures ◽  
Testosterone Replacement ◽  
Vertebral Compression Fractures ◽  
Testosterone Replacement Therapy ◽  
Male Hypogonadism ◽  
Mineral Density ◽  
Compression Fractures

While the contributing role of testosterone to bone health is rather modest compared to other factors such as estradiol levels, male hypogonadism is associated with low bone mass and fragility fractures. Along with stimulating physical puberty by achieving virilization and a normal muscle mass and improving psychosocial wellbeing, the goals of testosterone replacement therapy in male hypogonadism also include attainment of age-specific bone mineral density. We report on a 37-year-old man who presented with multiple vertebral compression fractures several years following termination of testosterone replacement therapy for presumed constitutional delay in growth and puberty. Here, we discuss the management of congenital hypogonadotropic hypogonadism with hyposmia (Kallmann syndrome), with which the patient was ultimately diagnosed, the role of androgens in the acquisition of bone mass during puberty and its maintenance thereafter, and outline specific management strategies for patients with hypogonadism and high risk for fragility fractures.

Reproductive failure of the red shiner (Cyprinella lutrensis) after exposure to an exogenous estrogen

2010 ◽  
Vol 67 (11) ◽  
pp. 1730-1743 ◽  
Author(s):  
Michelle M. McGree ◽  
Dana L. Winkelman ◽  
Nicole  K.M.  Vieira ◽  
Alan  M.  Vajda
Keyword(s):  
Reproductive Success ◽  
Great Plains ◽  
Endocrine Disrupting Chemicals ◽  
Water Control ◽  
Secondary Sexual Characteristics ◽  
Cyprinella Lutrensis ◽  
The Us ◽  
Sexual Characteristics ◽  
Solvent Control ◽  
17Β Estradiol

Endocrine disrupting chemicals (EDCs) have been detected in surface waters worldwide and can lead to developmental and reproductive disruption in exposed fishes. In the US Great Plains, EDCs are impacting streams and rivers and may be causing adverse reproductive effects. To examine how estrogenic EDCs might affect reproductive success of plains fishes, we experimentally exposed male red shiners ( Cyprinella lutrensis ) to exogenous 17β-estradiol. We characterized the effects of estradiol on male gonadal histology and secondary sexual characteristics, determined whether exposure reduced reproductive success, and examined the effects of depuration. Adults were exposed to a mean concentration of 70 ng·L−1 estradiol, a solvent control, or a water control for at least 83 days. Male exposure to estradiol resulted in elevated plasma vitellogenin concentrations, changes in spermatogenesis, reduced mating coloration and tubercles, altered mating behaviors, and reduced reproductive success with no viable progeny produced. Reproductive endpoints improved upon depuration (28 days). Exposure to estradiol had significant adverse effects on red shiners, indicating that wild populations may face developmental and reproductive difficulties if they are chronically exposed to estradiol.

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