The Experts below are selected from a list of 132 Experts worldwide ranked by ideXlab platform
Susan Nieschlag - One of the best experts on this subject based on the ideXlab platform.
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endocrine history the history of discovery synthesis and development of testosterone for clinical use
European Journal of Endocrinology, 2019Co-Authors: Eberhard Nieschlag, Susan NieschlagAbstract:As the most important male hormone, testosterone has an impact on almost all organs and body functions. The biological effects of testosterone and the testes have been known since antiquity, long before testosterone was identified as the active agent. Practical applications of this knowledge were castration of males to produce obedient servants, for punishment, for preservation of the prepubertal soprano voice and even for treatment of diseases. Testes were used in Organotherapy and transplanted as treatment for symptoms of hypogonadism on a large scale, although these practices had only placebo effects. In reaction to such malpractice in the first half of the 20th century science and the young pharmaceutical industry initiated the search for the male hormone. After several detours together with their teams in 1935, Ernst Laqueur (Amsterdam) isolated and Adolf Butenandt (Gdansk) as well as Leopold Ruzicka (Zurich) synthesized testosterone. Since then testosterone has been available for clinical use. However, when given orally, testosterone is inactivated in the liver, so that parenteral forms of administration or modifications of the molecule had to be found. Over 85 years the testosterone preparations have been slowly improved so that now physiological serum levels can be achieved.
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The History of Testosterone and The Testes: From Antiquity to Modern Times
Testosterone, 2017Co-Authors: Eberhard Nieschlag, Susan NieschlagAbstract:Extirpation and transplantation of endocrine glands are among the earliest tools in experimental endocrinology. The testes, with their exposed position, are vulnerable and easily accessible to external manipulation, including trauma and forceful removal. Thus, the effects of testosterone and its absence as a consequence of loss of the testes became known quite early in the history of mankind. Castration, leading to a loss of virility and fertility, has been used over centuries for punishment of criminal acts and high treason, for the creation of obedient slaves and servants and for preserving the prepubertal soprano voices for musical entertainment. Although the testes were correctly identified as the source of androgenicity, attempts to use them in Organotherapy can only have led to placebo effects. Testosterone itself was isolated only in 1935 and, since then, has been available as a powerful medication for the treatment of hypogonadism. Only recently has it become possible to produce injectable or transdermal testosterone preparations generating serum levels in the physiological range.
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Testosterone deficiency: a historical perspective.
Asian journal of andrology, 2014Co-Authors: Eberhard Nieschlag, Susan NieschlagAbstract:The biological effects of the testes and testosterone are known since antiquity. Aristotle knew the effects of castration and his hypothesis on fertilization is one of the first scientific encounters in reproductive biology. Over centuries, castration has been performed as punishment and to produce obedient slaves, but also to preserve the soprano voices of prepubertal boys. The Chinese imperial (and other oriental) courts employed castrates as overseers in harems who often obtained high-ranking political positions. The era of testis transplantation and Organotherapy was initiated by John Hunter in London who transplanted testes into capons in 1786. The intention of his experiments was to prove the 'vital principle' as the basis for modern transplantation medicine, but Hunter did not consider endocrine aspects. Arnold Adolph Berthold postulated internal secretion from his testicular transplantation experiments in 1849 in Gottingen and is thus considered the father of endocrinology. Following his observations, testicular preparations were used for therapy, popularized by self-experiments by Charles-Edouard Brown-Sequard in Paris (1889), which can at best have placebo effects. In the 1920s Sergio Voronoff transplanted testes from animals to men, but their effectiveness was disproved. Today testicular transplantation is being refined by stem cell research and germ cell transplantation. Modern androgen therapy started in 1935 when Enrest Lacquer isolated testosterone from bull testes in Amsterdam. In the same year testosterone was chemically synthesized independently by Adolf Butenandt in Gottingen and Leopold Ruzicka in Basel. Since testosterone was ineffective orally it was either compressed into subcutaneous pellets or was used orally as 17α-methyl testosterone, now obsolete because of liver toxicity. The early phases of testosterone treatment coincide with the first description of the most prominent syndromes of hypogonadism by Klinefelter, by Kallmann, DelCastillo and Pasqualini. In the 1950s longer-acting injectable testosterone enanthate became the preferred therapeutic modality. In the 1950s and 1960s, research concentrated on the chemical modification of androgens in order to emphasize their anabolic effects. Although anabolic steroids have largely disappeared from clinical medicine, they continue to live an illegal life for doping in athletics. In the 1970s the orally effective testosterone undecanoate was added to the spectrum of preparations. Recent transdermal gels and long-acting injectable preparations provide options for physiological testosterone substitution therapy.
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Testosterone deficiency: a historical perspective
Wolters Kluwer Medknow Publications, 2014Co-Authors: Eberhard Nieschlag, Susan NieschlagAbstract:The biological effects of the testes and testosterone are known since antiquity. Aristotle knew the effects of castration and his hypothesis on fertilization is one of the first scientific encounters in reproductive biology. Over centuries, castration has been performed as punishment and to produce obedient slaves, but also to preserve the soprano voices of prepubertal boys. The Chinese imperial (and other oriental) courts employed castrates as overseers in harems who often obtained high-ranking political positions. The era of testis transplantation and Organotherapy was initiated by John Hunter in London who transplanted testes into capons in 1786. The intention of his experiments was to prove the 'vital principle' as the basis for modern transplantation medicine, but Hunter did not consider endocrine aspects. Arnold Adolph Berthold postulated internal secretion from his testicular transplantation experiments in 1849 in Göttingen and is thus considered the father of endocrinology. Following his observations, testicular preparations were used for therapy, popularized by self-experiments by Charles-Edouard Brown-Séquard in Paris (1889), which can at best have placebo effects. In the 1920s Sergio Voronoff transplanted testes from animals to men, but their effectiveness was disproved. Today testicular transplantation is being refined by stem cell research and germ cell transplantation. Modern androgen therapy started in 1935 when Enrest Lacquer isolated testosterone from bull testes in Amsterdam. In the same year testosterone was chemically synthesized independently by Adolf Butenandt in Göttingen and Leopold Ruzicka in Basel. Since testosterone was ineffective orally it was either compressed into subcutaneous pellets or was used orally as 17α-methyl testosterone, now obsolete because of liver toxicity. The early phases of testosterone treatment coincide with the first description of the most prominent syndromes of hypogonadism by Klinefelter, by Kallmann, DelCastillo and Pasqualini. In the 1950s longer-acting injectable testosterone enanthate became the preferred therapeutic modality. In the 1950s and 1960s, research concentrated on the chemical modification of androgens in order to emphasize their anabolic effects. Although anabolic steroids have largely disappeared from clinical medicine, they continue to live an illegal life for doping in athletics. In the 1970s the orally effective testosterone undecanoate was added to the spectrum of preparations. Recent transdermal gels and long-acting injectable preparations provide options for physiological testosterone substitution therapy
Eberhard Nieschlag - One of the best experts on this subject based on the ideXlab platform.
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endocrine history the history of discovery synthesis and development of testosterone for clinical use
European Journal of Endocrinology, 2019Co-Authors: Eberhard Nieschlag, Susan NieschlagAbstract:As the most important male hormone, testosterone has an impact on almost all organs and body functions. The biological effects of testosterone and the testes have been known since antiquity, long before testosterone was identified as the active agent. Practical applications of this knowledge were castration of males to produce obedient servants, for punishment, for preservation of the prepubertal soprano voice and even for treatment of diseases. Testes were used in Organotherapy and transplanted as treatment for symptoms of hypogonadism on a large scale, although these practices had only placebo effects. In reaction to such malpractice in the first half of the 20th century science and the young pharmaceutical industry initiated the search for the male hormone. After several detours together with their teams in 1935, Ernst Laqueur (Amsterdam) isolated and Adolf Butenandt (Gdansk) as well as Leopold Ruzicka (Zurich) synthesized testosterone. Since then testosterone has been available for clinical use. However, when given orally, testosterone is inactivated in the liver, so that parenteral forms of administration or modifications of the molecule had to be found. Over 85 years the testosterone preparations have been slowly improved so that now physiological serum levels can be achieved.
-
The History of Testosterone and The Testes: From Antiquity to Modern Times
Testosterone, 2017Co-Authors: Eberhard Nieschlag, Susan NieschlagAbstract:Extirpation and transplantation of endocrine glands are among the earliest tools in experimental endocrinology. The testes, with their exposed position, are vulnerable and easily accessible to external manipulation, including trauma and forceful removal. Thus, the effects of testosterone and its absence as a consequence of loss of the testes became known quite early in the history of mankind. Castration, leading to a loss of virility and fertility, has been used over centuries for punishment of criminal acts and high treason, for the creation of obedient slaves and servants and for preserving the prepubertal soprano voices for musical entertainment. Although the testes were correctly identified as the source of androgenicity, attempts to use them in Organotherapy can only have led to placebo effects. Testosterone itself was isolated only in 1935 and, since then, has been available as a powerful medication for the treatment of hypogonadism. Only recently has it become possible to produce injectable or transdermal testosterone preparations generating serum levels in the physiological range.
-
Testosterone deficiency: a historical perspective.
Asian journal of andrology, 2014Co-Authors: Eberhard Nieschlag, Susan NieschlagAbstract:The biological effects of the testes and testosterone are known since antiquity. Aristotle knew the effects of castration and his hypothesis on fertilization is one of the first scientific encounters in reproductive biology. Over centuries, castration has been performed as punishment and to produce obedient slaves, but also to preserve the soprano voices of prepubertal boys. The Chinese imperial (and other oriental) courts employed castrates as overseers in harems who often obtained high-ranking political positions. The era of testis transplantation and Organotherapy was initiated by John Hunter in London who transplanted testes into capons in 1786. The intention of his experiments was to prove the 'vital principle' as the basis for modern transplantation medicine, but Hunter did not consider endocrine aspects. Arnold Adolph Berthold postulated internal secretion from his testicular transplantation experiments in 1849 in Gottingen and is thus considered the father of endocrinology. Following his observations, testicular preparations were used for therapy, popularized by self-experiments by Charles-Edouard Brown-Sequard in Paris (1889), which can at best have placebo effects. In the 1920s Sergio Voronoff transplanted testes from animals to men, but their effectiveness was disproved. Today testicular transplantation is being refined by stem cell research and germ cell transplantation. Modern androgen therapy started in 1935 when Enrest Lacquer isolated testosterone from bull testes in Amsterdam. In the same year testosterone was chemically synthesized independently by Adolf Butenandt in Gottingen and Leopold Ruzicka in Basel. Since testosterone was ineffective orally it was either compressed into subcutaneous pellets or was used orally as 17α-methyl testosterone, now obsolete because of liver toxicity. The early phases of testosterone treatment coincide with the first description of the most prominent syndromes of hypogonadism by Klinefelter, by Kallmann, DelCastillo and Pasqualini. In the 1950s longer-acting injectable testosterone enanthate became the preferred therapeutic modality. In the 1950s and 1960s, research concentrated on the chemical modification of androgens in order to emphasize their anabolic effects. Although anabolic steroids have largely disappeared from clinical medicine, they continue to live an illegal life for doping in athletics. In the 1970s the orally effective testosterone undecanoate was added to the spectrum of preparations. Recent transdermal gels and long-acting injectable preparations provide options for physiological testosterone substitution therapy.
-
Testosterone deficiency: a historical perspective
Wolters Kluwer Medknow Publications, 2014Co-Authors: Eberhard Nieschlag, Susan NieschlagAbstract:The biological effects of the testes and testosterone are known since antiquity. Aristotle knew the effects of castration and his hypothesis on fertilization is one of the first scientific encounters in reproductive biology. Over centuries, castration has been performed as punishment and to produce obedient slaves, but also to preserve the soprano voices of prepubertal boys. The Chinese imperial (and other oriental) courts employed castrates as overseers in harems who often obtained high-ranking political positions. The era of testis transplantation and Organotherapy was initiated by John Hunter in London who transplanted testes into capons in 1786. The intention of his experiments was to prove the 'vital principle' as the basis for modern transplantation medicine, but Hunter did not consider endocrine aspects. Arnold Adolph Berthold postulated internal secretion from his testicular transplantation experiments in 1849 in Göttingen and is thus considered the father of endocrinology. Following his observations, testicular preparations were used for therapy, popularized by self-experiments by Charles-Edouard Brown-Séquard in Paris (1889), which can at best have placebo effects. In the 1920s Sergio Voronoff transplanted testes from animals to men, but their effectiveness was disproved. Today testicular transplantation is being refined by stem cell research and germ cell transplantation. Modern androgen therapy started in 1935 when Enrest Lacquer isolated testosterone from bull testes in Amsterdam. In the same year testosterone was chemically synthesized independently by Adolf Butenandt in Göttingen and Leopold Ruzicka in Basel. Since testosterone was ineffective orally it was either compressed into subcutaneous pellets or was used orally as 17α-methyl testosterone, now obsolete because of liver toxicity. The early phases of testosterone treatment coincide with the first description of the most prominent syndromes of hypogonadism by Klinefelter, by Kallmann, DelCastillo and Pasqualini. In the 1950s longer-acting injectable testosterone enanthate became the preferred therapeutic modality. In the 1950s and 1960s, research concentrated on the chemical modification of androgens in order to emphasize their anabolic effects. Although anabolic steroids have largely disappeared from clinical medicine, they continue to live an illegal life for doping in athletics. In the 1970s the orally effective testosterone undecanoate was added to the spectrum of preparations. Recent transdermal gels and long-acting injectable preparations provide options for physiological testosterone substitution therapy
Nikolai Krementsov - One of the best experts on this subject based on the ideXlab platform.
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Hormones and the Bolsheviks: from Organotherapy to experimental endocrinology, 1918-1929.
Isis; an international review devoted to the history of science and its cultural influences, 2008Co-Authors: Nikolai KrementsovAbstract:ABSTRACT The discipline of endocrinology emerged over roughly the same period in Britain, France, Germany, Russia, the United States, and elsewhere, and its practitioners across the world shared research practices and agendas to a considerable degree. Yet the discipline's institutions, networks, and social practices were firmly embedded in the particular social fabric of concrete locales, and they were built on specific local traditions, resources, and patronage. Through analysis of the origins and early progress of Soviet endocrinology, this essay uncovers numerous factors and multiple actors involved with the institutional development of the discipline in the first decade of Bolshevik rule. As elsewhere in the world, the medicinal use of animal tissue extracts—Organotherapy—paved the way for wide acceptance of the ideas of the nascent science of endocrinology by both the Soviet medical community and the general public. Organotherapy also supplied the new discipline with “seed” institutions, technologies...
Richard Noll - One of the best experts on this subject based on the ideXlab platform.
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kraepelin s lost biological psychiatry autointoxication Organotherapy and surgery for dementia praecox
History of Psychiatry, 2007Co-Authors: Richard NollAbstract:Kraepelin believed that a chronic metabolic autointoxication, perhaps arising from the sex glands, eventually caused chemical damage to the brain and led to the symptoms of dementia praecox. The evolution of Kraepelin's autointoxication theory of dementia praecox is traced through the 5th to 8th (1895 to 1913) editions of his textbook, Psychiatrie. The historical context of autointoxication theory in medicine is explored in depth to enable the understanding of Kraepelin's aetiological assumption and his application of a rational treatment based on it — Organotherapy. A brief account of the North American reception of Kraepelin's concept of dementia praecox, its autotoxic basis, and the preferred American style of rational treatment — surgery — concludes the discussion.
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Kraepelin's 'lost biological psychiatry'? Autointoxication, Organotherapy and surgery for dementia praecox.
History of Psychiatry, 2007Co-Authors: Richard NollAbstract:Kraepelin believed that a chronic metabolic autointoxication, perhaps arising from the sex glands, eventually caused chemical damage to the brain and led to the symptoms of dementia praecox. The evolution of Kraepelin's autointoxication theory of dementia praecox is traced through the 5th to 8th (1895 to 1913) editions of his textbook, Psychiatrie. The historical context of autointoxication theory in medicine is explored in depth to enable the understanding of Kraepelin's aetiological assumption and his application of a rational treatment based on it — Organotherapy. A brief account of the North American reception of Kraepelin's concept of dementia praecox, its autotoxic basis, and the preferred American style of rational treatment — surgery — concludes the discussion.
Edward J. Mcguire - One of the best experts on this subject based on the ideXlab platform.
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A brief history of testosterone.
The Journal of urology, 2001Co-Authors: Erica R. Freeman, David A. Bloom, Edward J. McguireAbstract:Purpose: We explore the history of testosterone in the context of medical and scientific developments.Materials and Methods: A review of the scientific and historical literature was conducted.Results: The origins and effects of testosterone have been recognized throughout the history of humankind. Hunter performed testicular transplantation experiments in 1767 while studying tissue transplantation techniques, and almost a century later Berthold linked the physiological and behavioral changes of castration to a substance secreted by the testes. Brown-Sequard gave birth to the field of Organotherapy in 1889 when he announced that his auto-injection of testicular extracts resulted in rejuvenated physical and mental abilities. Steinach and Niehans expanded upon Brown-Sequard's work with rejuvenation treatments involving vasoligation, tissue grafts and cellular injections. In 1935 David et al isolated the critical ingredient in organotherapeutic treatments, testosterone.Conclusions: The effects of the powerful...