Cell-in-cell-mediated intercellular communication exacerbates the pro-inflammatory progression in asthma

Area of Science:

• Immunology
• Cell Biology
• Pulmonology

Background:

• Cell-in-cell (CIC) structures are observed in asthma, potentially mediating intercellular substance transport.
• Understanding CIC structures' role in asthma pathogenesis is crucial for developing new therapies.

Purpose of the Study:

• To investigate the significance of CIC structures in the inflammatory progression of asthma.
• To elucidate the mechanisms of CIC-mediated intercellular communication in asthma.

Main Methods:

• Analysis of CIC structures and inflammatory pathways in asthmatic and normal mouse lung tissue.
• In vitro studies using RNA-Seq, Western blotting, and immunofluorescence to analyze inflammatory pathway activation.
• Investigating intercellular substance transfer, including mitochondria, mediated by CIC structures.

Main Results:

• CIC structures involving lymphocytes and alveolar epithelial cells were identified in asthmatic lung tissue.
• Intercellular substance transfer, such as mitochondria, was mediated by CIC structures, promoting inflammation in two phases.
• Early phase: inflammasome-dependent inflammation and lymphocyte death. Later phase: released lymphocyte contents activated pattern-recognition receptors and NF-kappa B signaling in alveolar epithelial cells, amplifying inflammation.

Conclusions:

• CIC structures play a significant role in asthma pro-inflammation by mediating intercellular substance transfer and activating inflammatory signaling pathways.
• The findings provide a novel mechanistic insight into asthma progression.
• This research suggests CIC structures as a potential target for anti-inflammatory therapies in asthma.