Mechanotransduction at the Alveolar-Capillary Interface: How Mechanical Strain Modulates Innate Immune Memory and Type 2 Inflammatory Cascades in Chronic Airway Diseases

Original Research | 2026 | Volume 1 | Issue 1 | Page 01-07

1. Dr. Manoj Kumar, Tutor, Department of Physiology, JHMC, WB

2. Dr. Shahan Layek, Independent Researcher, West Bengal, India

Mechanotransduction at the Alveolar-Capillary Interface: How Mechanical Strain Modulates I.

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Corresponding Author:-

Dr. Shahan Layek

Independent Researcher

West Bengal, India

Email: layekcallmeshahan@gmail.com 

ABSTRACT

BACKGROUND: The alveolar-capillary interface is a highly dynamic environment subjected to constant mechanical forces, including cyclic stretch and shear stress. In chronic airway diseases such as asthma and chronic obstructive pulmonary disease (COPD), altered mechanical strain serves as a potent biophysical cue that transcends mere structural deformation, actively reprogramming the local immune microenvironment. This study investigates the mechanisms by which mechanical strain at the alveolar-capillary interface modulates innate immune memory and triggers Type 2 inflammatory cascades.

METHODS: Utilizing a microfluidic lung-on-a-chip model to simulate physiological and pathological strain, human alveolar epithelial cells and co-cultured immune cells were analyzed. Mechanotransduction pathways, specifically the roles of YAP/TAZ signaling and integrin-mediated adhesion, were evaluated for their impact on epigenetic remodeling in alveolar macrophages. The expression of Type 2 cytokines (IL-4, IL-5, IL-13) and markers of trained immunity were measured following exposure to chronic mechanical stress.

RESULTS: Findings demonstrate that pathological mechanical strain induces a "pro-inflammatory memory" in alveolar macrophages via YAP/TAZ-dependent epigenetic reprogramming. This strain-induced activation significantly upregulates the secretion of alarmins (IL-33, TSLP), which promote the maturation of Type 2-biased dendritic cells. Furthermore, mechanical loading was shown to directly enhance the sensitivity of alveolar epithelial cells to allergens, thereby lowering the threshold for initiating Type 2 inflammatory cascades.

CONCLUSION: Mechanical strain at the alveolar-capillary interface acts as a fundamental regulator of innate immune memory. By driving epigenetic shifts in resident immune cells and amplifying alarm-mediated signaling, pathological strain perpetuates chronic inflammation. Understanding these mechanotransduction pathways offers a novel therapeutic frontier for dampening Type 2 responses in chronic airway diseases.

KEYWORDS: Mechanotransduction, Alveolar-Capillary Interface, Innate Immune Memory, Type 2 Inflammation, Chronic Airway Disease, YAP/TAZ Signaling.