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Related Concept Videos

Chronic Obstructive Pulmonary Disease-II: Pathophysiology01:20

Chronic Obstructive Pulmonary Disease-II: Pathophysiology

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Chronic Obstructive Pulmonary Disease (COPD) pathophysiology is intricate and multifaceted, involving a complex interplay of physiological processes. Understanding these mechanisms is crucial for effectively managing and treating COPD. Here is an in-depth look at the critical elements in the pathophysiology of COPD:
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T Cell Types and Functions01:24

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When T cells with CD4 markers are activated, they give rise to two types of effector cells: helper T cells and regulatory T cells. Meanwhile, T cells with CD8 markers differentiate into effector cytotoxic T cells. The differentiation of CD4 T cells into helper T cell subsets, such as Th1, Th2, and Th17 cells, is dependent on the antigen type, antigen-presenting cell, and regulatory cytokines.
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Common myeloid progenitors (CMPs) are oligopotent cells that can differentiate into granulocytes and macrophages. Granulocytes and macrophages are essential for protecting the body against bacterial, viral, or fungal infections. They migrate from the bone marrow into the circulating blood to reach specific tissue sites where they differentiate and help in immune surveillance. However, they survive only for a few days and must be continuously made available to the organism to maintain a robust...
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Tuberculosis, or TB, is a bacterial infectious disease caused by Mycobacterium tuberculosis. While its primary impact is on the lungs, leading to pulmonary tuberculosis, it can also affect various other organs, a condition referred to as extrapulmonary tuberculosis.
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Cells of the Adaptive Immune Response01:23

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The T and B lymphocytes of the adaptive immune system develop from common lymphoid progenitor cells in the bone marrow. These progenitors give rise to precursors that eventually develop into both T and B lymphocytes. As these precursors mature, they gain the ability to detect and respond to foreign antigens in the body, a process known as immunocompetence. Additionally, these precursors acquire self-tolerance, a process that ensures they do not react to self-antigens. This intricate system...
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Related Experiment Video

Updated: Jan 11, 2026

Advanced Imaging of Lung Homing Human Lymphocytes in an Experimental In Vivo Model of Allergic Inflammation Based on Light-sheet Microscopy
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Progenitor T cells drive chronic pulmonary type 2 inflammation.

Radomir Kratchmarov, Xiaojiong Jia, Jun Nagai

    Biorxiv : the Preprint Server for Biology
    |November 19, 2025
    PubMed
    Summary

    Chronic type 2 inflammation is sustained by unique lung Th2 progenitors, distinct from acute responses. These progenitors self-renew and drive inflammation independently of antigen, highlighting a new cellular mechanism in allergic disease.

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    Area of Science:

    • Immunology
    • Cell Biology
    • Respiratory Medicine

    Background:

    • Type 2 inflammation is characterized by persistent CD4+ Th2 cell responses, unlike adaptive immunity collapse in chronic infections.
    • The cellular mechanisms sustaining chronic type 2 inflammation and preventing T cell exhaustion are not well understood.
    • Acute type 2 inflammation involves short-lived Th2 effector cells and type 2 innate lymphocytes (ILC2s).

    Purpose of the Study:

    • To define the cellular landscape of Th2 cells in chronic type 2 inflammation.
    • To investigate the mechanisms maintaining sustained Th2 responses in the lung.
    • To identify novel cell populations involved in chronic allergic inflammation.

    Main Methods:

    • Established a mouse model of long-term pulmonary allergen exposure.
    • Analyzed Th2 cell populations in lung parenchyma during chronic inflammation using transcriptomics.
    • Compared type 2 inflammation transcriptomes with chronic viral infection data.

    Main Results:

    • Chronic type 2 inflammation was sustained for at least 4 months in mice.
    • Identified an expanded T cell factor-1 (TCF1)-expressing progenitor-like Th2 population in the lung.
    • These lung Th2 progenitors exhibited self-renewal and effector differentiation, sustaining inflammation without persistent antigen.

    Conclusions:

    • Tissue Th2 progenitors are a distinct cellular state crucial for maintaining chronic type 2 inflammation.
    • These progenitors are sufficient to initiate and sustain type 2 inflammation, independent of lymph node support.
    • Lung Th2 progenitor maintenance involves B cells and is associated with lymphoid tissue formation.