CD147 increases mucus secretion induced by cigarette smoke in COPD

Area of Science:

• Pulmonary Medicine
• Cell Biology
• Molecular Biology

Background:

• CD147 is implicated in inflammatory diseases.
• Mucus overproduction is a key factor in chronic obstructive pulmonary disease (COPD), leading to airway obstruction and infections.
• The role of CD147 in COPD-associated mucus production remains unclear.

Purpose of the Study:

• To investigate the expression of CD147 and MUC5AC in COPD.
• To elucidate the mechanism by which CD147 influences mucus secretion in response to cigarette smoke.

Main Methods:

• Immunohistochemistry was used to assess CD147 and MUC5AC levels in human lung tissues from non-smokers, smokers without COPD, and COPD patients.
• In vitro studies utilized human bronchial epithelial (HBE) cells treated with cigarette smoke (CS) extract to model mucus secretion.
• Gene silencing of CD147 and inhibition of MMP9 and p38 MAPK pathways were employed to explore the underlying molecular mechanisms.

Main Results:

• CD147 and MUC5AC expression were significantly higher in COPD patients compared to controls.
• CS extract exposure increased CD147 and MUC5AC levels in HBE cells.
• Silencing CD147 reduced CS extract-induced MUC5AC secretion and the activation of MMP9 and p38 MAPK.

Conclusions:

• CD147 and MUC5AC expression are upregulated in COPD.
• CD147 promotes MUC5AC secretion in HBE cells via the MMP9 and p38 MAPK signaling pathway.
• Targeting CD147 presents a potential therapeutic strategy for managing mucus hypersecretion in COPD.