Analysis of information sources in references of the Wikipedia article "Anabolic steroid" in English language version.
[...] in a recent animal study, Hsiao et al. (10) found two different kinds of androgen response elements that could respond differentially to T and DHT. Therefore, it is possible that a selective androgen response element sequence may play a role in differential T vs. DHT AR trans-activation.
Although both testosterone and dihydrotestosterone activate the same androgen receptor, differences in the sequence of androgen response elements are responsible for differential regulation of these hormones (21).
In recent years several laboratories (Kochakian, Albright, Wilkins) have entertained the hope of finding a protein anabolic steroid without any, or with only minor, sexual effects. These studies have received special impetus and encouragement from the observation of Kochakian that certain steroids have greater renotrophic (anabolic?) than androgenic effects.
However, a third major quest, for the development of a nonvirilizing androgen ("anabolic steroid") suitable for use in women and children, based on dissociating the virilizing from the anabolic effects of androgens failed comprehensively (36). This failure is now understood as being due to the discovery of a singular androgen receptor (AR) together with the misinterpretation of nonspecific whole animal androgen bioassays employed to distinguish between anabolic and virilizing effects (37). The term "androgen" is used herein for both endogenous and synthetic androgens including references to chemicals named elsewhere as "anabolic steroids," "anabolic-androgenic steroids," or "specific AR modulators" (SARM), which continue to make an obsolete and oxymoronic distinction between virilizing and anabolic effects of androgens where there is no difference (36).
These findings also highlight how obsolete is the term "anabolic steroid," when falsely distinguishing from "androgen," a dichotomy devoid of physiological meaning and lingering mainly as a media piñata.10
By definition, all androgens combine intrinsic anabolic and androgenic properties, which have never been meaningfully separated [67], manifest via the androgen receptor, a protein encoded by a single copy gene. Hence the singularity of androgen action means that the terms "anabolic steroid" or "androgenic-anabolic steroids" remain an obsolete terminology making a distinction between androgenic and anabolic effects where there is no real difference [67]. This obsolete yet widely used terminology represent a vestige of the unsuccessful quest by the pharmaceutical industry to dissociate the virilizing from anabolic properties and remains in the public mind mainly as a media piñata. Androgen abuse, a more appropriate term which encompasses illicit use of all available androgens, will be used in this chapter.
Following the hiatus of World War II, the pharmaceutical industry development of synthetic steroids included pursuing the goal of a nonvirilizing androgen ('anabolic steroid') potentially suitable for use to obtain pharmacological androgen effects in women and children. [...] the industrial quest for an 'anabolic steroid' based on dissociating the virilizing from the anabolic effects of androgens failed. This is now understood in the light of the later discovery of the singular AR together with the flawed interpretations of relatively nonspecific whole animal bioassays then used to screen synthetic steroids for supposedly distinct anabolic and virilizing effects. Yet, despite the industry's abandonment of this fruitless endeavor by 1980, and its recent reincarnation under the guise of developing a 'selective AR modulator' (SARM) [6], the empty concept of an 'anabolic steroid' persists as an ill-defined and misleading scientific terminology [7, 8] . In this paper, the more accurate and clearer term 'androgen' is used exclusively for both endogenous and synthetic androgens, but includes references to chemicals loosely defined elsewhere as 'anabolic steroids' or 'anabolicandrogenic steroids', which confuse by making an obsolete distinction where there is no difference.
The development of nonsteroidal androgens, marketed as "selective androgen receptor modulators" (SARMs), offers new possibilities for adjuvant pharmacological androgen therapy. In contrast to the full spectrum of androgen effects of testosterone, such SARMs would be pure androgens not subject to tissue-specific activation by aromatization to a corresponding estrogen or to amplification of androgenic potency by 5a-reduction. In this context the endogenous pure androgens nandrolone and DHT can be considered prototype SARMs. SARMs are not the modern embodiment of so-called "anabolic steroids," an outdated term referring to hypothetical but nonexistent non-virilizing androgens targeted exclusively to muscle, a failed concept lacking biological proof of principle (Handelsman 2011).
Anabolic–androgenic steroids (AAS) are a class of natural and synthetic hormones that owe their name to their chemical structure (the steroid nucleus, see Figure 1) and the biological effects (anabolic and androgenic) they induce. Anabolic refers to the skeletal muscle-building properties of AAS, whereas androgenic refers to the induction and maintenance of male secondary sexual characteristics (which in principle includes the anabolic action, thereby rendering the term an oxymoron (1)).
Androgens, estrogens and progestins exert a negative feedback effect on the secretion of GnRH and LH by their actions on the pituitary and the hypothalamus. Most of the negative feedback effect of androgens is caused by their estrogenic metabolites produced by aromatization. 5α-Reduction does not seem to be necessary for the negative feedback effect of testosterone. (Rittmaster et al, 1992; Kumar et al, 1995a; Hayes et al, 2000).
Endogenous anabolic steroids such as testosterone and dihydrotestosterone and synthetic anabolic steroids mediate their effects by binding to and activating androgen receptors.
[...] in a recent animal study, Hsiao et al. (10) found two different kinds of androgen response elements that could respond differentially to T and DHT. Therefore, it is possible that a selective androgen response element sequence may play a role in differential T vs. DHT AR trans-activation.
Although both testosterone and dihydrotestosterone activate the same androgen receptor, differences in the sequence of androgen response elements are responsible for differential regulation of these hormones (21).
However, a third major quest, for the development of a nonvirilizing androgen ("anabolic steroid") suitable for use in women and children, based on dissociating the virilizing from the anabolic effects of androgens failed comprehensively (36). This failure is now understood as being due to the discovery of a singular androgen receptor (AR) together with the misinterpretation of nonspecific whole animal androgen bioassays employed to distinguish between anabolic and virilizing effects (37). The term "androgen" is used herein for both endogenous and synthetic androgens including references to chemicals named elsewhere as "anabolic steroids," "anabolic-androgenic steroids," or "specific AR modulators" (SARM), which continue to make an obsolete and oxymoronic distinction between virilizing and anabolic effects of androgens where there is no difference (36).
These findings also highlight how obsolete is the term "anabolic steroid," when falsely distinguishing from "androgen," a dichotomy devoid of physiological meaning and lingering mainly as a media piñata.10
Following the hiatus of World War II, the pharmaceutical industry development of synthetic steroids included pursuing the goal of a nonvirilizing androgen ('anabolic steroid') potentially suitable for use to obtain pharmacological androgen effects in women and children. [...] the industrial quest for an 'anabolic steroid' based on dissociating the virilizing from the anabolic effects of androgens failed. This is now understood in the light of the later discovery of the singular AR together with the flawed interpretations of relatively nonspecific whole animal bioassays then used to screen synthetic steroids for supposedly distinct anabolic and virilizing effects. Yet, despite the industry's abandonment of this fruitless endeavor by 1980, and its recent reincarnation under the guise of developing a 'selective AR modulator' (SARM) [6], the empty concept of an 'anabolic steroid' persists as an ill-defined and misleading scientific terminology [7, 8] . In this paper, the more accurate and clearer term 'androgen' is used exclusively for both endogenous and synthetic androgens, but includes references to chemicals loosely defined elsewhere as 'anabolic steroids' or 'anabolicandrogenic steroids', which confuse by making an obsolete distinction where there is no difference.
The identification of a single gene and protein for the androgen receptor in 1988 (584-586) explains the physiologic observation that, at equivalent doses, all androgens have essentially similar effects (587). The term "anabolic steroid" was invented during the post-WWII golden age of steroid pharmacology to define an idealized androgen lacking virilizing features but maintaining myotrophic properties so that it could be used safely in children and women. Although this quest proved illusory and was abandoned after all industry efforts failed to identify such a hypothetical synthetic androgen, the obsolete term "anabolic steroid" persists mainly as a lurid descriptor in popular media despite continuing to make a false distinction where there is no difference. Better understanding of the metabolic activation of androgens via 5α-reduction and aromatization in target tissues and the tissue-specific partial agonist/antagonist properties of some synthetic androgens may lead to more physiological concepts of tissue-specific androgen action ("specific androgen receptor modulator") governed by the physiological processes of pre-receptor androgen activation as well as post-receptor interaction with co-regulator proteins analogous to the development of synthetic estrogen partial agonists with tissue specificity ("specific estrogen receptor modulator") (588). The potential for new clinical therapeutic indications of novel tissue-selective androgens in clinical development remain to be fully evaluated (589).
Anabolic–androgenic steroids (AAS) are a class of natural and synthetic hormones that owe their name to their chemical structure (the steroid nucleus, see Figure 1) and the biological effects (anabolic and androgenic) they induce. Anabolic refers to the skeletal muscle-building properties of AAS, whereas androgenic refers to the induction and maintenance of male secondary sexual characteristics (which in principle includes the anabolic action, thereby rendering the term an oxymoron (1)).
Endogenous anabolic steroids such as testosterone and dihydrotestosterone and synthetic anabolic steroids mediate their effects by binding to and activating androgen receptors.
The identification of a single gene and protein for the androgen receptor in 1988 (584-586) explains the physiologic observation that, at equivalent doses, all androgens have essentially similar effects (587). The term "anabolic steroid" was invented during the post-WWII golden age of steroid pharmacology to define an idealized androgen lacking virilizing features but maintaining myotrophic properties so that it could be used safely in children and women. Although this quest proved illusory and was abandoned after all industry efforts failed to identify such a hypothetical synthetic androgen, the obsolete term "anabolic steroid" persists mainly as a lurid descriptor in popular media despite continuing to make a false distinction where there is no difference. Better understanding of the metabolic activation of androgens via 5α-reduction and aromatization in target tissues and the tissue-specific partial agonist/antagonist properties of some synthetic androgens may lead to more physiological concepts of tissue-specific androgen action ("specific androgen receptor modulator") governed by the physiological processes of pre-receptor androgen activation as well as post-receptor interaction with co-regulator proteins analogous to the development of synthetic estrogen partial agonists with tissue specificity ("specific estrogen receptor modulator") (588). The potential for new clinical therapeutic indications of novel tissue-selective androgens in clinical development remain to be fully evaluated (589).
Anabolic–androgenic steroids (AAS) are a class of natural and synthetic hormones that owe their name to their chemical structure (the steroid nucleus, see Figure 1) and the biological effects (anabolic and androgenic) they induce. Anabolic refers to the skeletal muscle-building properties of AAS, whereas androgenic refers to the induction and maintenance of male secondary sexual characteristics (which in principle includes the anabolic action, thereby rendering the term an oxymoron (1)).
These findings also highlight how obsolete is the term "anabolic steroid," when falsely distinguishing from "androgen," a dichotomy devoid of physiological meaning and lingering mainly as a media piñata.10
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: CS1 maint: bot: original URL status unknown (link)Androgens, estrogens and progestins exert a negative feedback effect on the secretion of GnRH and LH by their actions on the pituitary and the hypothalamus. Most of the negative feedback effect of androgens is caused by their estrogenic metabolites produced by aromatization. 5α-Reduction does not seem to be necessary for the negative feedback effect of testosterone. (Rittmaster et al, 1992; Kumar et al, 1995a; Hayes et al, 2000).
In recent years several laboratories (Kochakian, Albright, Wilkins) have entertained the hope of finding a protein anabolic steroid without any, or with only minor, sexual effects. These studies have received special impetus and encouragement from the observation of Kochakian that certain steroids have greater renotrophic (anabolic?) than androgenic effects.