First-pass extracted concept

tryptophan-kynurenine pathway

Candidate: concept label1 source documents4 linked claims

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Aliases

Trp-Kyn pathway

Evidence Snippets

A prominent example is the tryptophan-kynurenine (Trp-Kyn) pathway, initiated by indoleamine 2,3-dioxygenase 1/2 (IDO1/IDO2) and tryptophan 2,3-dioxygenase (TDO2), which converts tryptophan into kynurenine and downstream metabolites that engage stress-response programs and aryl hydrocarbon receptor (AhR) signaling.

Evidence 1Source 1DOI PubMedprovenance

Supporting Sources

Source 1primary paper2026MEDDOI PubMed

1 evidence snippet 4 linked claims Claim 1 Claim 2 Claim 3

Linked Claims

Claim 1evidence synthesissupports2026Source 1DOI PubMed

Bulk, single-cell, and spatial multi-omics studies support that Trp-Kyn pathway activity in HNSCC is compartmentalized rather than uniform.

Claim 2mechanismsupports2026Source 1DOI PubMed

In HNSCC, the tryptophan-kynurenine pathway converts tryptophan into kynurenine and downstream metabolites that engage stress-response programs and AhR signaling.

Claim 3spatial localizationsupports2026Source 1DOI PubMed

In HNSCC, Trp-Kyn enzymes are distributed across malignant cells, cancer-associated fibroblasts, endothelial cells, and tumor-associated myeloid populations, generating spatially restricted Trp-low/Kyn-high immunometabolic niches.

Claim 4therapeutic rationalesupports2026Source 1DOI PubMed

Compartmentalized Trp-Kyn pathway activity provides a mechanistic rationale for the limited performance of first-generation IDO1 inhibitor strategies in unselected clinical settings.