In the cardiovascular system, T-type calcium channels play an important role for the intracellular calcium homeostasis and spontaneous pacemaker activity and are involved in the progression of structural heart diseases. Androgens influence the cardiovascular physiology and pathophysiology. However, their effect on native T-type calcium currents (I(Ca,T)) remains unclear. To test the chronic eff...

OBJECTIVE To test the hypothesis that oral desogestrel (DSG) plus testosterone would uniformly and rapidly suppress sperm concentrations in young men as effectively as levonorgestrel (LNG) plus testosterone and cause less high-density lipoprotein (HDL) suppression and weight gain. DESIGN Single-blind, randomized trial. SETTING VA Puget Sound and University of Washington, Seattle, Washington...

OBJECTIVE This study was to demonstrate that Sal-T is a reliable biomarker of androgen status in the diagnosis of male hypogonadism. DESIGN In order to validate the salivary testosterone assay (Sal-T), its reproducibility, the agreement with serum free testosterone levels (Free-T), the correlation with other circulating androgen markers (bioavailable testosterone, total testosterone) and cut-...

T cells are considered to be unresponsive to testosterone due to the absence of androgen receptors (AR). Here, we demonstrate the testosterone responsiveness of murine splenic T cells in vitro as well as the presence of unconventional cell surface receptors for testosterone and classical intracellular AR. Binding sites for testosterone on the surface of both CD4(+) and CD8(+) subsets of T cells...

Because diffusion of testosterone (T) into the salivary gland is thought to be largely limited to the free, biologically active fraction, salivary testosterone is expected to provide a better measure of testosterone bioavailability in the body than is plasma testosterone. Matched saliva and blood spot samples were collected from 218 Zimbabwean males (age 11-23) who were at different stages of p...

Metabolic clearance rates of testosterone (MCR(T)) and androstenedione (MCR(A)) were determined twice during the same cycle in six normal women, using a constant infusion of testosterone-(3)H and androstenedione-(14)C. Nonlabeled steroids served as internal standards. Plasma concentrations of testosterone (i(T)) and androstenedione (i(A)) were measured, and the blood production of testosterone ...

Testosterone enhances aggression and can facilitate dominance in mammals, but most studies have been conducted on laboratory strains of mice and in simple environments. Unlike previous studies, laboratory and field tests were conducted using wild house mice, Mus musculus, to determine whether males with high, but physiological, testosterone levels (High T) would achieve dominance compared with ...

The 2014 World Anti-Doping Agency (WADA) Prohibited List shows testosterone and epitestosterone listed as class S1.1a and S1.1b, with its use banned in and out of competition [1]. Doping with testosterone is suspected if the urinary ratio of testosterone over epitestosterone (T/E) exceeds 4 [2]. According to the 2012 (WADA) laboratory statistics, elevated testosterone based on the testosterone ...

This study was conducted to examine the association between testosterone therapy and new myocardial infarction (MI) and stroke events in a series of patients treated at Low T Centers across the United States, consisting of mainly young (mean age = 46), otherwise, healthy men. Electronic medical records were queried between the years 2009 and 2014 to identify patients diagnosed with hypogonadism...