Zhu 2025 — Calcium-barrier-inflammation vicious cycle in asthma (H5b mechanism anchor)

One-paragraph summary

Mechanistic review consolidating the calcium-barrier-inflammation vicious cycle in asthma pathogenesis. Mechanical stress (airway stretch, shear) → TRPV1/TRPA1/Piezo1 mechanosensitive channel activation + STIM1-Orai1 SOCE + L-type calcium channels → calcium-protease activation → degradation of E-cadherin and occludin (tight-junction proteins) → barrier failure → Th2 cytokine release (IL-4, IL-13) → mucosal proliferation via TMEM16A → smooth muscle hypercontractility via MLCK/RhoA-ROCK + SOCE hyperactivation → Piezo1-mediated ECM remodeling. The bidirectional cycle proposes mechanical stress AND cytokines synergize to sustain pathology. Targets: STIM1-Orai1 and Piezo1. This is the single best mechanism anchor for H5b's three-domain framing (calcium × barrier × immune) operative in any condition — it instantiates the H5b architecture in asthma exactly as the H5b framework predicts for FM. Cross-condition mechanism-loading anchor for B-Gen-3 (H5b ↔ CA-I1 mast-cell intersection).

Claims as triples

• mechanical_stress — activates → store_operated_calcium_entry [evidence: review consolidation; confidence: established]
• store_operated_calcium_entry — activates → calcium_protease [evidence: review; confidence: established]
• calcium_protease — degrades → OCLN [evidence: asthma pathophysiology; confidence: emerging]
• calcium_protease — degrades → e_cadherin [evidence: asthma pathophysiology; confidence: emerging]
• store_operated_calcium_entry — drives → Th2_cytokine_release [evidence: asthma model; confidence: emerging]
• piezo1 — activates → store_operated_calcium_entry [evidence: mechanotransduction review; confidence: emerging]
• piezo1 — drives → ECM_remodeling [evidence: asthma pathophysiology; confidence: emerging]
• calcium_barrier_inflammation_cycle — operates_in → asthma [evidence: review framework; confidence: emerging]

Methods note

Narrative review synthesizing recent mechanistic literature. Asthma-specific but the mechanism is structurally generic — SOCE-driven calcium-protease-driven tight-junction degradation is the same machinery operating in any tissue with epithelial barrier + immune-cell SOCE. FM-direct extension is project-internal extrapolation, not paper-driven.

Limitations

• Review, not primary data
• Asthma-specific; FM-direct evidence absent
• Piezo1 mechanism layer is rapidly evolving; specific claims may need replication
• Calcium-protease specificity for OCLN (vs CLDN family) is not fully characterized — possibly a category claim about tight-junction component degradation rather than OCLN specifically

Open questions raised

• Q-IBC-10 (new): Does the calcium-barrier-inflammation cycle operate in FM gut barrier? Patient-derived intestinal biopsy + calcium imaging + tight-junction protein localization in FM-IgG-positive vs FM-IgG-negative patients.
• Q-IBC-11 (new): Is Piezo1 in the FM mechanism? FM has well-documented mechanosensitivity (pressure pain threshold reduction in QST); Piezo1 is the canonical mechanosensitive channel. Piezo1 expression in FM patient-derived MC, T cells, or sensory neurons would extend H5b to mechanotransduction.
• Q-IBC-12 (new): Does CRAC channel blockade (CM4620/Auxora) in H5b-stratified asthma patients reduce barrier markers + cytokine markers? Asthma is the natural first cross-condition test for the H5b cure-path arm, with shorter regulatory path than FM.

Triangulation notes

• Establishes B-Gen-3 (H5b ↔ CA-I1) in a non-FM condition. The mechanism Sanchez 2025 implies in FM mast cells (MRGPRX2 → SOCE → degranulation) is the same calcium-handling machinery operating in asthma airway tissue (mechanical → SOCE → calcium-protease → barrier failure + Th2). Cross-condition mechanism transfer is now anchored.
• Adds Piezo1 to the H5b candidate genetic-substrate map. The original 6-gene module (ORAI1+STIM1+MYO9B+OCLN+TJP1+CTLA4) did not include Piezo1; this review suggests Piezo1 polymorphisms could be an H5b extension candidate for the mechanotransduction arm. Worth considering for an H5b v0.2 expansion if Piezo1-mechanotransduction signal lands in FM literature.
• Compatible with the existing CA-I3 intersection (skeletal muscle calcium overload, Wirth-Scheibenbogen 2026, ME/CFS E/I imbalance 2026): SOCE-driven calcium homeostasis disruption operates in skeletal muscle too. Cross-intersection synthesis: CA-I1 (MC) and CA-I3 (skeletal muscle) may share Piezo1/SOCE upstream substrates.
• Compatible with calcium-protease degrading OCLN: explains why OCLN polymorphisms (H5b candidate gene) would be functionally important — variants that affect calcium-protease cleavage sensitivity would modulate barrier failure rate per unit calcium-cycle activation.

Bridges

• B-Gen-3 partial closure: H5b ↔ CA-I1 bridge now has cross-condition mechanism anchor in asthma. Bridge advances bridging → bridging-with-cross-condition-mechanism.
• New candidate bridge B-IBC-Piezo (NEW): Piezo1 mechanotransduction ↔ FM via calcium-barrier-inflammation cycle. Bridging tier; would require Piezo1 expression measurement in FM patient cells to close.

Ontology additions needed

• Consider adding piezo1 as new mechanosensitive channel entity
• Consider adding calcium_protease as new mechanism entity
• Consider adding e_cadherin as new adhesion-protein entity (related to OCLN/TJP1 barrier complex)
• Consider adding TMEM16A as new channel entity (asthma-specific but may extend)
• Consider adding calcium_barrier_inflammation_cycle as composite process entity

Chain-map update

• H5b mechanism layer gains cross-condition validation: the calcium-barrier-inflammation cycle is now an established mechanism in asthma. The FM-direct extension is bridging (project-internal extrapolation) but no longer purely speculative.
• Cross-intersection synthesis (CA-I1 + CA-I3): Piezo1/SOCE may be a shared upstream of the MC intersection (CA-I1) and the skeletal-muscle calcium-overload intersection (CA-I3). Worth investigating in the next calcium-hypothesis revision.

Confidence-tier framing

• SOCE-driven calcium-protease cleaves tight-junction proteins: emerging (asthma evidence)
• Calcium-barrier-inflammation vicious cycle in asthma: emerging (review consolidation)
• Same cycle in FM gut barrier: bridging (project-internal extrapolation, no FM-direct evidence)
• Piezo1 mechanotransduction in FM: inferred (predicted by framework + FM mechanosensitivity phenotype)
• B-Gen-3 closure: partial (cross-condition mechanism; FM-direct gate Q-IBC-1 / Q-IBC-2 still open)