inhibits / inhibitedBy

Properties expressing biological suppression relationships where one entity blocks, downregulates, or reduces activity in another. inhibitedBy is the inverse property.

Canonical URLs: https://healthschema.org/inhibits, https://healthschema.org/inhibitedBy

Namespace: hs:

Category: Biological Relationship Property

Inverse: inhibits ↔ inhibitedBy

Why These Properties Exist

Understanding what suppresses or blocks biological processes is fundamental to medicine. Drugs work by inhibiting enzymes, hormones downregulate metabolic pathways, and anti-inflammatory agents block inflammatory cascades. Yet schema.org provides no way to express these relationships.

When marking up health content, we frequently need to state things like:

"Botulinum toxin inhibits acetylcholine release"
"Cortisol inhibits collagen synthesis"
"COX-2 inhibitors block prostaglandin production"

The inhibits and inhibitedBy properties enable:

Drug mechanism documentation: Explain how medications work by linking them to what they block
Side effect understanding: Show why treatments have certain adverse effects
Contraindication modelling: Connect why certain combinations are problematic
Regulatory network mapping: Build complete pictures of biological control systems

Alignment with Established Ontologies

This property aligns with the Gene Ontology's negatively_regulates relationship. The terminology "inhibits" was chosen for accessibility whilst maintaining the semantic precision needed for medical content.

Domain and Range

inhibits — Used On (Domain)

Type	Context
schema:Drug	Medications that block enzymes, receptors, or biological processes
schema:ChemicalSubstance	Hormones, toxins, or other substances that suppress activity
schema:Protein	Regulatory proteins, antibodies, or enzymes that block targets
hs:BiologicalProcess	Processes that suppress other processes (e.g., apoptosis inhibiting proliferation)
schema:AnatomicalStructure	Structures that suppress others (e.g., inhibitory neurons)

inhibits — Expected Values (Range)

Type	Context
hs:BiologicalProcess	Cellular activities, metabolic processes, or physiological responses being suppressed
schema:ChemicalSubstance	Substances whose production or activity is reduced
schema:Protein	Proteins whose expression or activity is downregulated
schema:AnatomicalStructure	Cells or tissues being suppressed (e.g., immune cells, glands)

inhibitedBy — Domain and Range

The inverse property inhibitedBy has the domain and range reversed—it's used on the entity being suppressed, pointing to what suppresses it.

Relationship Semantics

Inverse Relationship

inhibits and inhibitedBy are formal inverses. If A inhibits B, then B is inhibitedBy A:

Statement	Equivalent Inverse
Botulinum toxin inhibits muscle contraction	Muscle contraction inhibitedBy botulinum toxin
Cortisol inhibits collagen synthesis	Collagen synthesis inhibitedBy cortisol

Relationship to stimulates

inhibits is semantically opposite to stimulates. Use inhibits for negative regulatory relationships (suppression) and stimulates for positive regulatory relationships (activation).

Types of Inhibition

This property covers various forms of suppression:

Competitive inhibition: Blocking a receptor or binding site
Non-competitive inhibition: Reducing enzyme activity without blocking the active site
Downregulation: Reducing expression or production
Antagonism: Opposing the effect of another substance

The property doesn't distinguish between these mechanisms—use description or mechanism to specify when important.

Not Transitive

If A inhibits B, and B inhibits C, it does NOT follow that A inhibits C. In fact, this often means A indirectly activates C (disinhibition). Each relationship must be explicitly stated.

Usage Guidance

Do

Use for regulatory relationships—where one entity decreases the activity or expression of another
Document drug mechanisms—link medications to what they block
Explain side effects—show why treatments cause certain adverse outcomes
Reference defined entities—use @id to link to entities defined elsewhere
Combine with evidenceSource—link inhibition claims to supporting research

Don't

Confuse with contraindications—inhibits describes mechanism, not clinical guidance
Use for absence—"lacks" or "doesn't produce" is not inhibition
Assume transitivity—inhibiting an inhibitor creates disinhibition, not continued inhibition
Overstate certainty—if the relationship is dose-dependent or conditional, note this

Examples

Example 1: Drug Inhibiting a Process

Documenting how botulinum toxin works:

{
  "@type": "Drug",
  "@id": "#Drug/BotulinumToxin",
  "name": "Botulinum toxin",
  "alternateName": ["Botox", "BTX-A"],
  "inhibits": {
    "@type": "BiologicalProcess",
    "@id": "#BiologicalProcess/AcetylcholineRelease",
    "name": "Acetylcholine release",
    "description": "Release of acetylcholine at neuromuscular junctions"
  },
  "description": "Neurotoxin that blocks neuromuscular transmission by preventing acetylcholine release"
}

Why this works: Clearly links the drug to its mechanism of action—essential for understanding both therapeutic effects and risks.

Example 2: Hormone Inhibiting Protein Production

Explaining how stress affects skin:

{
  "@type": "ChemicalSubstance",
  "@id": "#ChemicalSubstance/Cortisol",
  "name": "Cortisol",
  "sameAs": "https://www.wikidata.org/wiki/Q190875",
  "inhibits": [
    {"@id": "#BiologicalProcess/CollagenSynthesis"},
    {"@id": "#BiologicalProcess/ElastinSynthesis"},
    {"@id": "#BiologicalProcess/HyaluronicAcidProduction"}
  ],
  "description": "Glucocorticoid stress hormone that suppresses extracellular matrix production"
}

Why this works: Shows the multiple suppressive effects of cortisol—useful for explaining why chronic stress accelerates skin ageing.

Example 3: Process Listing Its Inhibitors

From the perspective of the process being suppressed:

{
  "@type": "BiologicalProcess",
  "@id": "#BiologicalProcess/CollagenSynthesis",
  "name": "Collagen synthesis",
  "inhibitedBy": [
    {"@id": "#ChemicalSubstance/Cortisol"},
    {"@id": "#BiologicalProcess/UVExposure"},
    {"@id": "#BiologicalProcess/ChronicInflammation"}
  ],
  "stimulatedBy": [
    {"@id": "#Protein/TGF-beta"},
    {"@id": "#Protein/VitaminC"}
  ]
}

Why this works: Shows both positive and negative regulators of a process, creating a complete regulatory picture.

Example 4: Enzyme Inhibitor Drug

COX inhibitor mechanism:

{
  "@type": "Drug",
  "@id": "#Drug/Aspirin",
  "name": "Aspirin",
  "alternateName": "Acetylsalicylic acid",
  "inhibits": {
    "@type": "Protein",
    "@id": "#Protein/COX1",
    "name": "Cyclooxygenase-1",
    "alternateName": "COX-1"
  },
  "description": "Irreversible COX inhibitor that blocks prostaglandin synthesis"
}

Example 5: Bidirectional Declaration

Complete graph with both directions specified:

{
  "@graph": [
    {
      "@type": "Drug",
      "@id": "#Drug/Finasteride",
      "name": "Finasteride",
      "inhibits": {"@id": "#Protein/5AlphaReductase"}
    },
    {
      "@type": "Protein",
      "@id": "#Protein/5AlphaReductase",
      "name": "5-alpha reductase",
      "description": "Enzyme converting testosterone to dihydrotestosterone",
      "inhibitedBy": {"@id": "#Drug/Finasteride"}
    }
  ]
}

Example 6: With Evidence Source

Combining inhibition relationship with supporting evidence:

{
  "@type": "ChemicalSubstance",
  "@id": "#ChemicalSubstance/Menthol",
  "name": "Menthol",
  "inhibits": {
    "@type": "BiologicalProcess",
    "@id": "#BiologicalProcess/SkinBarrierFunction",
    "name": "Skin barrier function"
  },
  "description": "Irritant that damages lip tissue when used repeatedly in plumping products",
  "evidenceSource": {
    "@type": "WebPage",
    "@id": "https://www.aad.org/public/everyday-care/lip-care",
    "name": "Lip care recommendations",
    "publisher": {
      "@type": "Organization",
      "name": "American Academy of Dermatology"
    }
  }
}

Implementation Notes

Graph Queries

Example SPARQL queries enabled by this property:

Find all inhibitors of a process:

SELECT ?inhibitor ?name WHERE {
  ?inhibitor hs:inhibits <#BiologicalProcess/CollagenSynthesis> .
  ?inhibitor schema:name ?name .
}

Find what a drug inhibits:

SELECT ?target ?name WHERE {
  <#Drug/Finasteride> hs:inhibits ?target .
  ?target schema:name ?name .
}

Build a suppression network:

SELECT ?source ?target WHERE {
  ?source hs:inhibits ?target .
  ?source a schema:Drug .
}

Validation

Standard schema.org validators will not recognise these properties. This is expected for Health Schema extensions. The properties are defined in the Health Schema context.