Chlorodehydromethyltestosterone
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Chlorodehydromethyltestosterone (CDMT), marketed as Oral Turinabol, is a synthetic anabolic-androgenic steroid (AAS) characterized by its oral bioavailability and chemical formula C20H27ClO2.
It consists of a 4-chloro substitution on the metandienone (Dianabol) structure, specifically 4-chloro-17α-methylandrosta-1,4-dien-17β-ol-3-one, which confers resistance to hepatic metabolism and enhances anabolic potency relative to androgenic effects.
Developed by the East German firm Jenapharm in the early 1960s and approved for clinical use by 1965, CDMT was primarily employed for performance enhancement rather than therapeutic applications.
Pharmacokinetic studies indicate rapid absorption, high binding to sex hormone-binding globulin (SHBG), and urinary excretion of about 60% of the dose as metabolites, facilitating its detection in doping controls.
CDMT achieved infamy through its instrumental role in the German Democratic Republic’s (GDR) state-orchestrated doping initiative from the late 1960s onward, where it was systematically dosed to approximately 9,000 athletes under programs like State Plan 14.25 to secure competitive edges in Olympic and world championships.
This regimen propelled GDR athletes to over 100 Olympic gold medals but precipitated widespread adverse effects, including hepatotoxicity, endocrine disruptions, infertility, myocardial hypertrophy, and irreversible virilization in women, as documented in post-reunification medical evaluations and athlete accounts.
Prohibited by the International Olympic Committee since the mid-1970s and classified under anabolic agents in the World Anti-Doping Agency’s Prohibited List, CDMT remains a Schedule III controlled substance in the United States, with ongoing detections linked to its long-term metabolites enabling retrospective sanctions.
Mechanism of Action
Chlorodehydromethyltestosterone (CDMT) acts primarily as an agonist of the androgen receptor (AR), a nuclear transcription factor that mediates the effects of androgens in target tissues such as skeletal muscle.
Binding of CDMT to the AR, located in the cytoplasm, triggers dissociation from inhibitory heat shock proteins like Hsp90, enabling receptor dimerization, phosphorylation, and translocation to the nucleus.
There, the ligand-receptor complex binds to specific DNA sequences known as androgen response elements (AREs), modulating the transcription of genes that enhance anabolic processes.
This genomic mechanism promotes muscle hypertrophy by upregulating genes involved in protein synthesis, including insulin-like growth factor 1 (IGF-1) and myogenic regulatory factors, while simultaneously suppressing catabolic pathways such as those activated by glucocorticoids.
In skeletal muscle, where 5α-reductase activity is low, CDMT’s direct AR binding favors myotrophic effects over androgenic ones in accessory tissues, contributing to its reported anabolic selectivity.
Empirical studies on anabolic-androgenic steroids (AAS) demonstrate increased muscle protein synthesis rates following AR activation, with resistance training amplifying these outcomes through synergistic signaling.
CDMT may also elicit non-genomic effects via membrane-bound AR or associated pathways, rapidly activating kinases like Akt/mTOR and ERK1/2 to further boost protein synthesis and inhibit proteolysis independently of transcriptional changes.
Structural modifications, including 17α-methylation for oral bioavailability and 4-chloro substitution, enhance AR affinity while preventing aromatization to estrogens, ensuring effects remain predominantly androgenic without indirect estrogen-mediated actions.
Relative binding affinity data for similar AAS indicate high potency at muscle AR compared to prostate receptors, supporting tissue-specific efficacy.
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