androgen
Enable an agent to recognise an androgen, distinguish its chemical identity from its biological activity, and assess what evidence is needed to interpret or act on it.
Research draft, second pass
A second pass drafted this model: the structure a model of this thing needs, and what is known about it in the world. The line under this one says how the second half was obtained - researched against sources, or recalled without web access, in which case nothing here was read anywhere and every claim is a lead to verify. Unreviewed either way.
recalled by Codex without web access - no source was read
Researched by: Codex
Purpose and description
Enable an agent to recognise an androgen, distinguish its chemical identity from its biological activity, and assess what evidence is needed to interpret or act on it.
An androgen is a natural or synthetic substance that activates the androgen receptor, supporting androgen-dependent sexual development and reproductive function and influencing tissues including muscle, bone, skin and hair follicles.
It can be Resolve a substance name to a chemical identity and document the basis for calling it an androgen.; Trace whether an observed effect follows direct receptor activation or metabolic conversion.; Compare androgen activity only after aligning assay conditions, endpoints and reference substances.; Interpret a reported concentration against its specimen, method, timing and applicable reference context.; Flag missing evidence before drawing conclusions about physiological effects or proposed interventions..
Distinguishing features
Test whether classification rests on androgenic biological activity or conversion to an active androgen; steroid structure alone does not establish membership.
Distinguish an androgen receptor agonist from an antagonist: receptor binding without the direction of its effect is insufficient.
Distinguish testosterone as a particular androgen from androgen as the wider class; the terms are not interchangeable.
Distinguish direct receptor activity from precursor status, since metabolic conversion can account for an observed androgenic effect.
Distinguish the active substance from a medicine containing it, and from the concentration measured in a specimen.
Scope
+ Membership in the androgen class and the evidence supporting that classification
+ Individual androgen identities, endogenous origins and exogenous forms
+ Androgen receptor activity and distinctions between direct action and activity following metabolic conversion
+ Production, transport, tissue conversion and clearance relevant to androgen availability
+ Measurement and interpretation of androgen exposure in a specified biological context
- Whole-organism taxonomy, anatomy or identity
- Complete models of endocrine diseases or reproductive conditions
- Individual diagnosis, prescribing and treatment selection
- Full drug-product formulation, manufacturing and supply-chain records
- Comprehensive models of other hormone classes or the androgen receptor itself
Characteristics
- Referent level
- androgen class | specified molecule | specified derivative | measured analyte Prevents class-level statements from being treated as properties of every member or every specimen.
- Chemical identity
- Resolved chemical entity, including stereochemistry and derivative or ester status where applicable Similar names can denote substances with different activation, transport or analytical behaviour.
- Origin
- endogenous | exogenous | mixed | unknown, with organism and source context A molecule's identity alone does not establish how it entered a biological system.
- Androgen receptor activity
- Assay-specific potency and efficacy, such as EC50 in mol/L and response relative to a named reference Activity comparisons require the assay, receptor system and reference substance.
- Metabolic activation and conversion
- Precursor-to-product links with enzyme, tissue, organism and supporting evidence Observed effects may depend on conversion rather than direct activity of the starting substance.
- Measured concentration
- Analyte-specific molar or mass concentration, with specimen, collection time, method and total or free fraction A concentration is interpretable only when the measured entity and sampling conditions are known.
- Transport and binding
- Free and protein-bound fractions, binding partners and method of determination where established Total circulating concentration and the free fraction describe different aspects of availability.
- Biological response context
- Organism, tissue, developmental stage, receptor competence, exposure duration and measured endpoint The same exposure need not produce the same response across biological settings.
Also called
Where this came from
wikidata · CC0 1.0
Drafted structure
Bundle to layer to finding to question, as the second pass will find it: 5 bundles · 9 layers · 15 findings · 23 questions.
Androgen identity and boundaries Establish what the androgen label denotes and why it applies.
Androgen is a functional class whose members, precursors and pharmaceutical forms must not be conflated.
Class membership
Record the operational definition and evidence used to include a substance.
Basis of androgen classification
Separate demonstrated androgenic activity from classification based on naming, structure or precursor relationships.
- What definition of androgen is being used, and does it include weak precursors or nonsteroidal receptor agonists? definition
- What evidence supports including this substance under that definition? provenance
Molecular and product boundaries
Separate the class, a chemical member and a preparation containing that member.
Resolved androgen entity
Identify the precise molecule or derivative to which an assertion applies.
- Which chemical identity, stereochemistry and derivative status does the name resolve to? definition
- Does the assertion concern the active androgen, an ester or other precursor, a formulated product, or a measured analyte? boundary
Receptor action and response Connect androgen exposure to receptor activity and observed biological endpoints.
Binding, activation and physiological response are distinct evidence steps.
Androgen receptor pharmacology
Describe activity in a defined receptor and assay system.
Binding versus activation
Keep receptor affinity separate from agonist efficacy and functional potency.
- Does the evidence demonstrate binding, receptor activation, antagonism or a mixture dependent on assay conditions? boundary
- Which assay, receptor system, reference agonist and units support the reported potency or efficacy? measurement
Context-dependent effects
Locate androgen-associated responses in tissues, organisms and exposure conditions.
Attribution of biological response
Assess whether a response is attributable to the parent androgen, its metabolites or another mechanism.
- In which organism, tissue, developmental stage and exposure interval was the response observed? measurement
- What evidence separates androgen receptor-mediated effects from metabolite-mediated effects or other pathways? provenance
Production, transport and metabolism Trace how an androgen becomes available and changes within a biological system.
Circulating abundance alone cannot represent local production, activation or removal.
Origin and availability
Record endogenous production, external exposure and transport.
Sources and circulating fractions
Distinguish the origin of the substance from its distribution between free and bound forms.
- What evidence identifies endogenous production sites or exogenous exposure for this androgen in the system under study? provenance
- Which free and protein-bound fractions were measured or estimated, and by what method? measurement
Tissue conversion and clearance
Represent activation, interconversion, inactivation and elimination as substance-specific pathways.
Metabolic fate
Track transformations without assuming that all androgens share the same pathways.
- Which conversions are established for this molecule, including any 5α-reduction or aromatisation, and in which tissues and organisms? provenance
- Which products retain androgenic activity, acquire another hormonal activity, or represent inactivation and clearance? boundary
Measurement, interpretation and action Determine what an androgen measurement supports and what further evidence an action requires.
Analytical limitations and biological context can change the meaning of a reported androgen value.
Analytical evidence
Specify the analyte, specimen and method behind a measurement.
Interpretable androgen result
Preserve enough analytical context to evaluate specificity and comparability.
- Which androgen, specimen matrix, collection time, units and total or free fraction does the result describe? measurement
- What method, quantification limits, cross-reactivity or other interference evidence governs confidence in this result? measurement
Decision boundaries
Connect available evidence to bounded interpretation and appropriate next steps.
Evidence before intervention
Distinguish a laboratory observation from a conclusion about tissue effects or a justified intervention.
- Which method- and population-appropriate reference context supports interpreting this result, and what remains uncertain about tissue response? boundary
- What additional verification or qualified review is needed before this evidence informs supplementation, suppression or another intervention? action
Evidence and external alignment What the world already says about this thing, gathered so the model can be checked against it.
A model that cannot be lined up against existing standards, identifiers and practice cannot be adopted by anyone who already uses them.
Reported evidence
Findings from the breadth pass, kept separate from the structural claims.
Check these first
Recalled without web access and unsourced; every item is a lead to verify.
- This is recalled knowledge, not source-verified research.
- DHEA and androstenedione are commonly grouped with androgens, but much of their physiological androgenic effect depends on conversion to more potent molecules.
- Androgens occur in all sexes; neither the class nor its physiological functions should be restricted to males.
- Which of these check these first hold for the sense of androgen this model covers, and on what evidence? provenance
Kinds and varieties
Recalled without web access and unsourced; every item is a lead to verify.
- Testosterone
- Dihydrotestosterone (DHT)
- Androstenedione, a weak androgen and precursor
- Dehydroepiandrosterone (DHEA), principally an androgen precursor
- 11-oxygenated androgens
- Synthetic anabolic-androgenic steroids
- Which of these kinds and varieties hold for the sense of androgen this model covers, and on what evidence? provenance
Identifiers and schemes
Recalled without web access and unsourced; every item is a lead to verify.
- CAS Registry Number - 58-22-0 - Identifies testosterone specifically; androgen is a functional class with no single CAS number.
- CAS Registry Number - 521-18-6 - Identifies dihydrotestosterone specifically.
- Which of these identifiers and schemes hold for the sense of androgen this model covers, and on what evidence? provenance
Real-world use
Recalled without web access and unsourced; every item is a lead to verify.
- Endogenous regulation of sexual differentiation, puberty and reproductive function.
- Maintenance of muscle, bone and other androgen-responsive tissues.
- Prescribed androgen replacement for established hormone deficiency.
- Masculinizing hormone therapy.
- Measurement in investigations of androgen excess, deficiency and steroid synthesis disorders.
- Which of these real-world use hold for the sense of androgen this model covers, and on what evidence? provenance
Typical measurements
Recalled without web access and unsourced; every item is a lead to verify.
- Serum total testosterone concentration - Reference intervals depend on age, sex, pubertal stage, sampling time and assay. - nmol/L or ng/dL
- Serum free testosterone concentration - Reference intervals depend on population and whether the value is measured or calculated. - pmol/L or pg/mL
- Which of these typical measurements hold for the sense of androgen this model covers, and on what evidence? provenance
Failure modes and hazards
Recalled without web access and unsourced; every item is a lead to verify.
- Androgen excess can cause acne, hirsutism or virilization, depending on the individual and exposure.
- Exogenous androgens can suppress gonadotropin secretion and sperm production.
- Androgen treatment can cause erythrocytosis.
- Some orally active, 17α-alkylated anabolic-androgenic steroids can cause liver injury.
- Androgen exposure during pregnancy can disrupt fetal sexual development.
- Which of these failure modes and hazards hold for the sense of androgen this model covers, and on what evidence? provenance
Neighbouring kinds and how to tell them apart
Recalled without web access and unsourced; every item is a lead to verify.
- Testosterone - A particular androgen molecule; androgen denotes the broader functional class.
- Anabolic-androgenic steroid - A steroid with anabolic and androgenic activity; the term androgen emphasizes androgen-receptor-mediated activity.
- Androgen precursor - Supplies substrate for production of active androgens; precursor status alone does not establish substantial direct receptor activity.
- Antiandrogen - Reduces androgen production or action rather than activating androgen signaling.
- Estrogen - Acts principally through estrogen receptors; some androgens can be converted into estrogens by aromatase.
- Androgen receptor - The receptor protein that mediates androgen signaling, rather than a substance that activates it.
- Which of these neighbouring kinds and how to tell them apart hold for the sense of androgen this model covers, and on what evidence? provenance
What the second pass must settle
- Which authoritative definition should govern inclusion of weak androgen precursors and nonsteroidal androgen receptor agonists in this registry entry?
- Does an existing Vercy world model already cover androgen, requiring this entry to link to it rather than own a duplicate model?
- Should the initial publication cover human physiology only, or include other organisms with explicitly separated evidence?
- Which primary sources and reference assays can substantiate member-specific activity, conversion pathways and measurement limitations?
- How should the model represent disputed or context-dependent claims about tissue selectivity and relative anabolic versus androgenic effects?