Chronic Obstructive Pulmonary Disease (COPD) is characterized by irreversible airflow limitation, progressive lung tissue remodeling, and persistent inflammation. Recent studies have deepened our understanding of how innate immune mediators sustain and exacerbate the inflammatory cascade.
High Mobility Group Box 1 (HMGB1) has emerged as a critical endogenous danger signal (DAMP), increasingly recognized for its role in orchestrating the inflammatory microenvironment in chronic respiratory diseases.
HMGB1 expression is markedly elevated in lung tissues and immune cells of COPD patients, especially in response to cigarette smoke extract. Importantly, HMGB1 actively promotes M1-type macrophage polarization, shifting the macrophage phenotype toward a pro-inflammatory profile. This polarization is not a passive consequence but a functionally significant event, as M1 macrophages secrete high levels of TNF-α, IL-6, IL-1β, and other mediators that amplify lung tissue damage and perpetuate immune cell recruitment.
Macrophage polarization in COPD and HMGB1 protein
The study highlights the activation of the NF-κB signaling pathway, a key transcriptional hub for inflammatory genes, as a downstream effect of HMGB1 signaling. The result is a self-reinforcing loop of chronic inflammation, apoptosis of epithelial cells, and impaired tissue regeneration, hallmark features of COPD pathology.
Moreover, HMGB1 appears to influence cellular proliferation and survival, with increased M1 polarization correlating with reduced macrophage proliferation and increased apoptosis. These findings support the dual role of HMGB1 as both a pro-inflammatory cytokine and a regulator of macrophage dynamics, positioning it at the crossroads of immune dysregulation and tissue remodeling in COPD.
By modulating HMGB1 expression or blocking its interaction with pattern recognition receptors (such as TLR4 and RAGE), it may be possible to shift macrophage polarization toward a more regulatory M2 phenotype, potentially alleviating the chronic inflammation and tissue destruction associated with COPD.
At HMGBiotech Srl, we provide comprehensive information to facilitate informed decision-making for researches with HMGB1.
Discover more about our HMGB1 protein
Read the full article about the study
