Testosterone and DHT bind the androgen receptor, trigger dimerization and nuclear translocation, and drive transcription of muscle growth, bone density, and red blood cell genes.
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Androgen Receptor Binding
Testosterone (key)
AR receptor (lock)
LCLT molecule
Bound complex (active)
Androgens exert their anabolic effects primarily through the androgen receptor (AR), a member of the nuclear receptor superfamily encoded by the AR gene on the X chromosome. AR is expressed in skeletal muscle, bone, liver, brain, prostate, and skin, but the density and sensitivity of muscle AR is the primary determinant of the anabolic response to endogenous testosterone and exogenous androgen exposure.
Both testosterone and its more potent derivative dihydrotestosterone (DHT, formed by 5-alpha reductase in target tissues) are high-affinity AR ligands. DHT has approximately 3-5 times higher AR binding affinity than testosterone and dissociates more slowly, producing a stronger but more tissue-specific anabolic/androgenic signal. Testosterone is the primary circulating androgen; DHT is the primary intracrine androgen in tissues expressing 5-alpha reductase (prostate, skin, scalp). In skeletal muscle, 5-alpha reductase activity is relatively low, so testosterone itself is the dominant ligand for muscle AR.
Before ligand binding, AR is maintained in an inactive cytoplasmic complex with heat-shock proteins (HSP70, HSP90) and other chaperones. This complex keeps the receptor properly folded and the ligand-binding domain accessible. Testosterone binding induces a conformational change in the AR ligand-binding domain that triggers: HSP dissociation, exposure of the nuclear localization signal, receptor phosphorylation (by Src and MAPK), and dimerization with a second ligand-bound AR monomer.
The AR dimer translocates to the nucleus via importin-alpha/beta. In the nucleus, it recognizes palindromic androgen response elements (AREs, canonical sequence 5'-GGTACAnnnTGTTCT-3') in gene promoters and enhancers. With coactivators (SRC-1, p300, PGC-1alpha), it drives transcription of anabolic genes: myosin heavy chain isoforms (Type II fiber maintenance), IGF-1 (local muscle isoform), follistatin (myostatin antagonist), and GLUT4 (glucose uptake). Resistance training increases AR protein expression in muscle, which is one mechanism by which trained individuals are more responsive to endogenous testosterone fluctuations. This training-induced AR upregulation partially explains why resistance training before or during puberty sets a higher adult androgen sensitivity.
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Testosterone mechanism articles
Anabolic steroids mechanism content
Hormone and hypertrophy explainers
Source & accuracy
This androgen receptor binding is an editorial illustration built to represent the concept accurately. Where it shows figures, they are typical or representative values chosen to make the relationship clear, not a single underlying dataset. The diagram and its explainer are reviewed and maintained centrally, and updated over time as understanding improves.
From hormone binding to gene transcription
The androgen receptor is an intracellular protein that responds to androgens such as testosterone and its more potent derivative dihydrotestosterone (DHT). When an androgen binds, the receptor changes shape, releases the chaperone proteins holding it inactive, and pairs up in a process called dimerization. The hormone-bound receptor then moves into the cell nucleus, a step called nuclear translocation, where it binds specific DNA sequences and influences which genes are transcribed.
In this way a circulating hormone is translated into a change in the cell's protein-making program.
The downstream genes and a note on context
Genes regulated through androgen receptor activity include those associated with muscle protein expression, bone density, and stimulation of red blood cell production, which is part of why androgens influence tissues throughout the body. Sensitivity to androgens also depends on how much receptor a tissue expresses, not only on hormone levels.
This describes normal physiology and is general educational information, not medical advice. Anabolic steroids and other androgen-based interventions carry significant health risks and are matters for qualified medical supervision, not self-experimentation.
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