hormone
the secretion of an endocrine gland that is transmitted by the blood to the tissue on which it has a specific effect
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 a hormone, record its endocrine signalling context, interpret observations and identify what evidence is needed before acting on them.
A hormone, in the classical endocrine sense, is a chemical messenger secreted by an endocrine gland into the blood that alters the activity of distant target cells possessing the appropriate receptors.
It can be Match a named substance or measured analyte to a specified hormone form.; Trace evidence from endocrine source through blood transport to responsive tissue.; Compare measurements after checking units, assays, fractions and sampling context.; Identify competing explanations involving secretion, transport, clearance or responsiveness.; Flag missing evidence and route diagnostic or treatment decisions to the relevant clinical model..
Distinguishing features
Establish an endocrine secretory source and a blood-borne route to responsive tissue; presence in blood alone does not establish hormone status.
Identify receptor-mediated signalling evidence rather than classifying a substance as a hormone solely because it changes tissue function.
Distinguish the secreted hormone from its precursor, inactive metabolite and laboratory measurement surrogate.
Separate a molecule's endocrine role from local signalling roles it may also perform.
Distinguish endogenous secretion from administered material even when their molecular identities match.
Scope
+ Hormone identity, molecular form and distinctions between precursors, active forms and metabolites
+ Endocrine source, secretion conditions and regulation
+ Blood transport, availability and clearance
+ Target receptors, tissue responsiveness and physiological effects
+ Contextual measurement and evidence supporting interpretation
- Endocrine glands and target organs as complete anatomical entities
- Whole organisms, species taxonomy and population conservation
- Local paracrine or autocrine signalling considered independently of blood-borne endocrine action
- Endocrine diseases as diagnostic and treatment models
- Hormone medicines as manufactured products with prescribing and administration requirements
Characteristics
- Molecular identity and form
- Established name, molecular identifier, chemical class and specified molecular form Prevents precursors, metabolites and related molecules from being treated as interchangeable.
- Endocrine source
- Secreting cell type, tissue or gland, with organism and life-stage context Connects hormone identity to its biological source without assuming a single source in every context.
- Secretion pattern
- Observed basal, pulsatile, rhythmic or stimulus-linked secretion, with timing and evidence A sampled concentration may not represent secretion across time.
- Circulating concentration
- Assay-reported amount or mass per volume, such as pmol/L or ng/mL, with specimen and sampling time Supports comparison only when analyte, units, method and sampling context are compatible.
- Transport and binding
- Carrier identity where applicable; free, bound or total fraction measured Changes in binding can change the relationship between measured concentration and tissue exposure.
- Target receptor and tissue
- Receptor identity, responding cell or tissue and supporting evidence Makes the claimed specificity of action explicit.
- Biological response
- Specified endpoint, response direction, magnitude where measured and observation interval Separates hormone detection from demonstrated biological effect.
- Clearance or circulating half-life
- Clearance in volume/time or half-life in time units, with organism and experimental conditions Helps distinguish altered removal from altered secretion.
- Feedback participation
- Regulated variable, upstream signal, feedback direction and physiological context Supports interpretation of linked signals rather than an isolated hormone value.
Analytical facets
- substance
- living
- origin
- natural
- agency
- inert
- mobility
- not-applicable
- scale
- not-applicable
- affordances
- observable
Also called
+121
Where this came from
oewn:2024 · CC BY 4.0
Drafted structure
Bundle to layer to finding to question, as the second pass will find it: 6 bundles · 11 layers · 19 findings · 29 questions.
Hormone identity and boundary Establish which molecular entity and endocrine role the record describes.
Hormone names can conceal differences between molecular forms, biological roles and measured analytes.
Molecular form
Resolve names to the specific substance under consideration.
Active form and related molecules
Record the identified form and its relationship to precursors, processed products and metabolites.
- Which molecular form does this hormone name designate in this record? definition
- Which precursors, metabolites or related forms must be distinguished from it? boundary
Endocrine role
Test inclusion against the registry's blood-borne endocrine definition.
Source, route and target evidence
Capture evidence for endocrine secretion, blood transport and a specific effect in responsive tissue.
- What evidence establishes an endocrine source, circulation through blood and a responsive target? provenance
- Does this observation concern endocrine action, local signalling or administered material? boundary
Production and secretion Describe where the hormone is produced and how release changes with physiological context.
Source and release dynamics are necessary to interpret circulating hormone observations.
Secretory source
Connect hormone production and release to identified endocrine cells.
Production, processing and release
Distinguish synthesis, any required processing and secretion for the specified hormone.
- Which cells or tissues synthesise and secrete this form in the organism under study? provenance
- What processing, if any, separates the synthesised precursor from the released or active form? definition
Release dynamics
Record secretion timing and the conditions that modify it.
Stimuli and temporal pattern
Characterise supported release patterns without assigning a universal baseline.
- Which stimuli or upstream signals alter secretion, and in what direction? provenance
- What sampling interval and physiological context are needed to detect the relevant secretion pattern? measurement
Circulation and clearance Describe transport through blood and processes that determine persistence and availability.
Circulating concentration reflects transport and removal as well as secretion.
Blood transport
Identify circulating forms and carrier interactions where applicable.
Free, bound and total hormone
Specify which circulating fraction is observed and how binding affects its interpretation.
- Does the observation represent free, bound or total hormone, and how was that fraction determined? measurement
- Which carrier interactions, if any, must be considered when relating this result to tissue exposure? provenance
Conversion and removal
Track activation, inactivation and elimination relevant to hormone persistence.
Metabolic fate
Separate removal of the measured form from conversion into another biologically relevant form.
- Which tissues and processes convert, inactivate or eliminate this hormone form? provenance
- Under what conditions were any reported half-life or clearance values measured? measurement
Target response and feedback Connect receptor engagement to tissue effects and endocrine regulation.
Hormone availability, tissue responsiveness and feedback must be distinguished to explain an observed effect.
Receptor-dependent response
Describe the receptors and tissue conditions supporting a specific response.
Receptor and effect link
Record evidence linking hormone exposure to receptor activity and a defined biological endpoint.
- Which receptor and responding cell type support the claimed effect? provenance
- What endpoint, exposure level and observation interval demonstrate the response? measurement
Feedback regulation
Place the hormone within supported regulatory relationships.
Regulated variable and loop
Identify what is regulated and how downstream conditions influence upstream secretion.
- Which regulated variable or downstream signal feeds back on this hormone's release? definition
- Which linked observations would help distinguish changed secretion from changed target responsiveness? measurement
Measurement and interpretation Make hormone observations comparable and state the limits of conclusions drawn from them.
An assay result cannot be interpreted reliably without knowing what was measured and under which conditions.
Analytical observation
Capture specimen, assay and collection details that affect the reported value.
Assay-specific result
Bind each value to its analyte, method, units and sampling conditions.
- What specimen, assay, hormone form, units and collection time produced this result? measurement
- What evidence addresses cross-reactivity, interference and specimen handling for this assay? provenance
Contextual interpretation
Constrain comparison and subsequent action to the available physiological and analytical evidence.
Comparison and action limits
Record applicable comparison conditions, unresolved explanations and boundaries on agent action.
- Which reference interval or comparison series applies to this assay, organism and physiological state? measurement
- What missing context must be resolved before comparison, and which proposed decisions require a clinical or experimental protocol? 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 description covers the supplied classical endocrine sense; broader usage also includes hormones produced by dispersed endocrine cells and plant hormones.
- Glycoprotein hormones are a subgroup of protein hormones, so the listed kinds are not mutually exclusive.
- Specific identifiers, reference preparations, assay intervals, and therapeutic rules require substance-level verification; none were researched for this response.
- Which of these check these first hold for the sense of hormone this model covers, and on what evidence? provenance
Kinds and varieties
Recalled without web access and unsourced; every item is a lead to verify.
- Peptide and protein hormones, including insulin and growth hormone
- Glycoprotein hormones, including thyroid-stimulating hormone and follicle-stimulating hormone
- Steroid hormones, including cortisol and aldosterone
- Thyroid hormones, including thyroxine and triiodothyronine
- Catecholamine hormones, including adrenaline and noradrenaline
- Which of these kinds and varieties hold for the sense of hormone 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 - Digits in three hyphen-separated groups, with a final check digit - Identifies particular hormone substances or preparations; hormone as a functional class has no single CAS number.
- ChEBI - CHEBI: followed by digits - Provides identifiers for chemical entities and biological roles relevant to hormones.
- UniProtKB - UniProtKB accession - Relevant to peptide and protein hormone precursors; the accession may describe a precursor containing several processed products rather than only the mature hormone.
- Which of these identifiers and schemes hold for the sense of hormone this model covers, and on what evidence? provenance
Standards and regulation
Recalled without web access and unsourced; every item is a lead to verify.
- WHO International Standards provide reference preparations for selected hormones to support assay calibration and, where applicable, assignment of biological activity in international units.
- Which of these standards and regulation hold for the sense of hormone 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 metabolism, growth, reproduction, stress responses, and fluid and electrolyte balance
- Measurement in blood to investigate endocrine gland function and feedback relationships
- Hormone replacement when endogenous production is deficient
- Pharmacological stimulation or suppression of hormone-dependent processes
- Monitoring physiological changes and responses to treatment
- Which of these real-world use hold for the sense of hormone this model covers, and on what evidence? provenance
Typical measurements
Recalled without web access and unsourced; every item is a lead to verify.
- Circulating molar concentration - Hormone-specific; interpretation depends on sampling time, physiological state, and assay. - pmol/L or nmol/L
- Circulating mass concentration - Hormone-specific; total and unbound concentrations can differ substantially. - pg/mL or ng/mL
- Concentration expressed against a biological reference standard - Analyte- and reference-standard-specific; no class-wide interval. - IU/L or mIU/L
- Which of these typical measurements hold for the sense of hormone 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.
- Insufficient secretion can impair the functions normally supported by the hormone.
- Excess secretion can overstimulate target tissues and disrupt physiological feedback.
- Receptor defects or downstream signalling defects can cause hormone resistance despite adequate or elevated circulating concentrations.
- Inappropriate exogenous hormone exposure can cause adverse effects and suppress endogenous production through feedback.
- Assay interference, binding-protein changes, and poorly timed sampling can produce misleading laboratory interpretations.
- Which of these failure modes and hazards hold for the sense of hormone this model covers, and on what evidence? provenance
Regional variation
Recalled without web access and unsourced; every item is a lead to verify.
- Laboratories and jurisdictions differ in reporting units, assay methods, and reference intervals.
- Adrenaline and epinephrine are alternative names for the same hormone; noradrenaline and norepinephrine likewise name the same substance.
- Which of these regional variation hold for the sense of hormone 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.
- Neurotransmitter - A neurotransmitter is released by a neuron to signal across a synaptic junction; a circulating endocrine messenger acts through blood transport. The same molecule can serve both roles.
- Paracrine mediator - A paracrine mediator acts locally on neighbouring cells rather than reaching distant targets through systemic circulation.
- Autocrine signal - An autocrine signal acts on the cell that secreted it; classical endocrine signalling acts on distant target cells.
- Exocrine secretion - An exocrine secretion is delivered through a duct onto an epithelial surface or into a lumen rather than secreted into the blood.
- Neurohormone - A neurohormone is released into circulation by a neurosecretory neuron; it is a hormone distinguished by its cellular source.
- Hormone receptor - The receptor is the molecular component that recognizes the hormone and initiates or modifies signalling, rather than the circulating messenger itself.
- Which of these neighbouring kinds and how to tell them apart hold for the sense of hormone this model covers, and on what evidence? provenance
What the second pass must settle
- Should this entry's endocrine-gland definition include hormones released by dispersed endocrine cells, or should those cases remain explicit boundary questions?
- How should hormones outside blood-circulating animal systems be related to this narrowly defined registry entry?
- Which authoritative nomenclature and identifier sources should govern hormone forms, precursors and metabolites?
- What evidence threshold should establish endocrine action when the same molecule also has local signalling roles?
- Which hormone-specific assay and physiological-context requirements need specialised extensions rather than inclusion in this general model?