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A 3D Human Lung Tissue Model for Functional Studies on Mycobacterium tuberculosis Infection
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A 3D Human Lung Tissue Model for Functional Studies on Mycobacterium tuberculosis Infection

Published on: October 5, 2015

[Heterogeneity of pulmonary fibroblasts in tuberculosis]

E A Kogan, S M Sekamova, I V Bogadel'nikova

    Arkhiv Patologii
    |May 1, 1997
    PubMed

    Insights

    Two fibroblast types influence tuberculosis progression. Lipid-free (THY 1-) fibroblasts drive inflammation and epithelial changes, while lipid-rich (THY 1+) fibroblasts contribute to scarring and prolonged tissue remodeling in tuberculosis.

    Area of Science:

    • Pathology
    • Cell Biology
    • Immunology

    Background:

    • Chronic inflammation and pneumofibrosis are hallmarks of tuberculosis (TB) pathogenesis.
    • Specific fibroblast subtypes are hypothesized to mediate TB chronicity and sclerosis.
    • Understanding fibroblast roles is crucial for TB treatment strategies.

    Purpose of the Study:

    • To investigate the characteristics and roles of different fibroblast populations in secondary tuberculosis lesions.
    • To elucidate the mechanisms by which fibroblasts contribute to inflammation chronicity and tissue remodeling in TB.

    Main Methods:

    • Analysis of fibrous tissue from secondary TB foci (tuberculomas, fibrous-cavernous TB) in 35 patients.
    • Utilized light microscopy, electron microscopy, and immunohistochemistry.
    • Characterized fibroblasts based on lipid content and expression of specific markers (THY 1) and growth factors (IGF-2, EGF receptors).

    Main Results:

    • Lipid-free (THY 1-) fibroblasts, expressing insulin-like growth factor 2 (IGF-2), binding proteins, and epidermal growth factor receptors, were found near granulomas and in active lesion areas.
    • These (THY 1-) fibroblasts demonstrated auto- and paracrine regulatory functions on cell proliferation within inflammatory foci.
    • Lipid-containing (THY 1+) fibroblasts were identified in older sclerotic areas amidst collagen fibers.

    Conclusions:

    • Lipid-free (THY 1-) fibroblasts are likely key drivers of inflammation chronicity, epithelial proliferation, and potential pre-tumorous changes in secondary TB.
    • (THY 1+) fibroblasts, rich in lipids, may promote collagenesis and survive long-term in hypoxic scar tissue, contributing to persistent fibrosis.

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