Role of miR-466 in mesenchymal stromal cell derived extracellular vesicles treating inoculation pneumonia caused by multidrug-resistant Pseudomonas aeruginosa

Clin Transl Med. 2021 Jan;11(1):e287. doi: 10.1002/ctm2.287.


Rationale: The effects of mesenchymal stromal cells (MSCs) and MSC-derived extracellular vesicles (MSC EVs) on multidrug-resistant pseudomonas aeruginosa (MDR-PA)-induced pneumonia remain unclear.

Materials and methods: MicroRNA array and RT-PCR were used to select the major microRNA in MSC EVs. Human peripheral blood monocytes were obtained and isolated from qualified patients. The crosstalk between MSCs/MSC EVs and macrophages in vitro was studied. MDR-PA pneumonia models were further established in C57BL/6 mice and MSC EVs or miR-466 overexpressing MSC EVs were intratracheally instilled.

Results: MiR-466 was highly expressed in MSC EVs. MSCs and miR-466 promoted macrophage polarization toward Type 2 phenotype through TIRAP-MyD88-NFκB axis. Moreover, cocultured macrophages with miR-466 overexpressing MSCs significantly increased the phagocytosis of macrophages. MSC EVs significantly reduced mortality and decreased influx of BALF neutrophils, proinflammatory factor levels, protein, and bacterial load in murine MDR-PA pneumonia. Administration of miR-466 overexpressing MSC EVs further alleviated the inflammatory severity.

Conclusions: MSC-derived EVs containing high levels of miR-466 may partly participate in host immune responses to MDR-PA. Both MSCs and MSC EVs have therapeutic effects in treating MDR-PA-induced pneumonia.

Keywords: extracellular vesicles; mesenchymal stromal cell; micoRNA; multidrug-resistant pseudomonas aeruginosa; pneumonia.