The Roles of Androgens in Humans: Biology, Metabolic Regulation and Health

Androgens are steroid hormones with diverse roles in human biology. Prior research has shown they influence metabolism, skeletal health, and brain function. However, the exact mechanisms of androgen signaling remain unclear in some contexts. No prior work had resolved how androgens interact with estrogens to regulate reproductive and metabolic systems. This gap motivated a review of androgen types, functions, and signaling pathways. The interplay between androgens and corticosteroids is also poorly understood. That uncertainty drove an analysis of feedback systems within the hypothalamic-pituitary-gonadal axis. Understanding these relationships could clarify age-related hormonal changes and metabolic decline.

This review aims to compile current knowledge on androgen types, functions, and signaling mechanisms. It focuses on less-known roles of androgens in metabolic regulation and brain development. The study addresses how androgens interact with estrogens in reproductive and metabolic systems. It also explores the relationship between androgens and corticosteroids in the adrenal cortex. The purpose includes examining feedback systems of the hypothalamic-pituitary-gonadal axis. Age-related hypogonadism is a central concern, particularly in men and postmenopausal women. The review also considers how androgens collaborate with estradiol to maintain metabolic function. Clinical applications of testosterone replacement therapy are evaluated for their effectiveness and limitations.

The review approach involves synthesizing existing literature on androgen biology and signaling. It includes tabulating and describing types of androgens and their functions. The study analyzes the interrelationship between corticosteroids and androgens, focusing on the adrenal cortex. It examines feedback mechanisms of the hypothalamic-pituitary-gonadal axis and its modulation by metabolic and environmental factors. The review highlights testosterone's role in metabolic regulation and age-related decline. It also investigates how testosterone interacts with estradiol to maintain body function. The clinical use of testosterone esters is analyzed in detail. The main problems associated with testosterone replacement therapy are discussed.

Androgens regulate metabolic energy fate, skeletal integrity, and brain development. They serve as precursors to estrogens, influencing reproductive mechanisms in both sexes. The review identifies close interrelationships between corticosteroids and androgens in the adrenal cortex. Feedback systems of the hypothalamic-pituitary-gonadal axis are modulated by sex, age, and metabolic state. Testosterone is highlighted for its high synthesis rate and turnover. Age-related hypogonadism is linked to functional decline in men and postmenopausal women. Testosterone and estradiol work together to maintain metabolic systems. Clinical use of testosterone esters shows effectiveness but also reveals challenges in application.

The review synthesizes evidence on androgen roles in metabolism, reproduction, and aging. It emphasizes the importance of testosterone in maintaining metabolic and cognitive function. The collaboration between testosterone and estradiol is critical for metabolic health. Age-related hypogonadism is a key factor in functional decline. The interplay between androgens and corticosteroids remains an area requiring further study. Clinical applications of testosterone replacement therapy have shown benefits but also limitations. The review suggests that androgen signaling is modulated by metabolic and hormonal environments. These findings support the need for continued research into androgen regulation and its clinical implications.