What question did this study set out to answer?

To determine whether tumor necrosis factor-alpha signaling is essential for acute cigarette smoke-induced lung inflammation and connective tissue breakdown.

September 1, 2002American Journal of Respiratory and Critical Care Medicine

Tumor Necrosis Factor-α Is Central to Acute Cigarette Smoke–induced Inflammation and Connective Tissue Breakdown

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Authors

ACAndrew ChurgSouth Australia Pathology JDJin DaiCentral South University HTHsin TaiUniversity of British Columbia

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Implication

Experimental mouse study demonstrates that knocking out tumor necrosis factor-alpha receptors prevents smoke-induced lung damage, indicating its central role in emphysema pathogenesis.

Key Points

To determine whether tumor necrosis factor-alpha signaling is essential for acute cigarette smoke-induced lung inflammation and connective tissue breakdown.
Exposed double knockout mice lacking p55 and p75 tumor necrosis factor-alpha receptors (TNF-alpha-RKO) and wild-type control mice to acute cigarette smoke.
Measured lung gene expression of inflammatory chemoattractants (MIP-2, MCP-1, TNF-alpha) at 2, 6, and 24 hours, along with lavage cells and markers of elastin (desmosine) and collagen (hydroxyproline) breakdown at 24 hours.
Assessed pulmonary inflammatory responses to cigarette smoke at 24 hours and 7 days in strain 129 mice exhibiting naturally low TNF-alpha production.
Control mice showed significant gene expression increases in TNF-alpha, MIP-2, and MCP-1 at 2 hours post-smoke exposure that resolved by 6 hours, whereas TNF-alpha-RKO mice showed no induction at any time point.
At 24 hours post-exposure, control mice exhibited increased bronchoalveolar lavage neutrophils, macrophages, desmosine, and hydroxyproline, whereas TNF-alpha-RKO mice showed no increases in these inflammatory cells or tissue breakdown markers.
Strain 129 mice with low TNF-alpha production mounted no inflammatory response to smoke exposure at either 24 hours or 7 days.

Cite This Study

Churg et al. (2002) studied this question.

synapsesocial.com/papers/69d97fb4c7f0c3ae80a3dbf2 https://doi.org/10.1164/rccm.200202-097oc

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Implication

Experimental mouse study demonstrates that knocking out tumor necrosis factor-alpha receptors prevents smoke-induced lung damage, indicating its central role in emphysema pathogenesis.

Tumor Necrosis Factor-α Is Central to Acute Cigarette Smoke–induced Inflammation and Connective Tissue Breakdown

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Implication

Key Points

Cite This Study

Tumor Necrosis Factor-α Is Central to Acute Cigarette Smoke–induced Inflammation and Connective Tissue Breakdown

Discussion

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Implication

Key Points

Cite This Study

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