The discovery and derivation of testosterone: from physiological observations to breakthroughs in chemical synthesis

The discovery and derivation of testosterone marked an important milestone in human physiology, particularly in the regulation of male characteristics and reproductive health. The following is an overview of the key historical and scientific aspects of testosterone discovery and derivation.

Early Observations (19th century)

Testicular function and androgens: The idea that testicles produce the substances responsible for male characteristics dates back to ancient times. In 1849, German physiologist Arnold Adolph Berthold conducted an experiment on roosters, removing their testicles and observing changes in their behavior and physical characteristics. This was one of the first experiments to show that the testicles secrete a substance (later identified as androgens) that affects male characteristics.

It wasn't until the late 19th century, however, that scientists began to look more closely at the chemistry of these substances.

Discovery of Testosterone (1935)

Adolf Buternant and Leopold Ruzka: The breakthrough in the identification and isolation of testosterone came in 1935. Two independent research teams, led by Adolf Buternant in Germany and Leopold Ruzka in Switzerland, successfully synthesized testosterone from cholesterol. But in his work, he isolated 15 milligrams of testosterone from 10,000 liters of urine, showing that testosterone is the main sex hormone in men.

From Cholesterol synthesis: The chemical structure of testosterone was determined, and it was shown to be derived from cholesterol, a steroid molecule. This finding highlights that cholesterol is a precursor to steroid hormones such as testosterone, cortisol and estrogen.

Nobel Prize: For their work on the synthesis of testosterone and related hormones, Ruzicka and Butenandt were awarded the Nobel Prize in Chemistry in 1939.
The biological role of testosterone

Testosterone is a steroid hormone that belongs to the androgen group and is essential for male development and reproductive function. It plays a key role in:

Development of masculine characteristics: It promotes the development of secondary sexual characteristics such as a deeper voice, increased muscle mass, and facial/body hair growth during puberty.

Spermatogenesis: Testosterone is essential for sperm production in men.

Sex drive and mood: Testosterone also affects sex drive, mood regulation, and energy levels.

Anabolic action: It has an anabolic effect that stimulates protein synthesis and promotes muscle and bone growth.

Testosterone Derivation and production

Biosynthesis: In the human body, testosterone is mainly in the testicles of men, and to a lesser extent in the ovaries and adrenal glands of women. Biosynthesis begins with cholesterol, which convert into pregnenolone by a series of enzymatic reactions and then into testosterone via intermediates such as androstenedione.

Commercial synthesis: Testosterone is also available through chemical synthesis in the laboratory, which led to the development of testosterone replacement therapy (TRT) and anabolic steroids for medical use. Originally, testosterone was derived from animal or plant sterols, such as diosgenin in yam.

For medical and therapeutic purposes

After its discovery, they quickly use testosterone for a variety of therapeutic purposes, such as treating hypogonadism (testosterone deficiency), promoting muscle growth, and improving bone density in older men.

They also develop Synthetic derivatives of testosterone, known as anabolic steroids, and use them to enhance athletic performance.

Testosterone analogues and their research

Continued research into testosterone has led to the development of analogues with slightly altered structures to improve efficacy, reduce side effects, and target specific tissues. This work provides insights into the broad biological role of androgens.
The discovery of testosterone paved the way for endocrinology, hormone replacement therapy, and the understanding of sex differences and gender health.