CD18-mediated adhesion is required for the induction of a proinflammatory phenotype in lung epithelial cells by mononuclear cell-derived extracellular vesicles.
Exp Cell Res
; 365(1): 78-84, 2018 04 01.
Article
en En
| MEDLINE
| ID: mdl-29476835
ABSTRACT
Extracellular vesicles are submicron vesicles that upregulate the synthesis of proinflammatory mediators by lung epithelial cells. We investigated whether these structures adhere to lung epithelial cells, and whether adhesion is a prerequisite for their proinflammatory activity. Extracellular vesicles were generated by stimulation of normal human mononuclear cells with the calcium ionophore A23187, and labelled with carboxyfluorescein diacetate succinimidyl ester. Adhesion of vesicles to monolayers of immortalized bronchial epithelial (16HBE) and alveolar (A549) cells was analyzed by fluorescence microscopy. The role of candidate adhesion receptors was evaluated with inhibitory monoclonal antibodies and soluble peptides. The synthesis of proinflammatory mediators was assessed by ELISA. Transmission electron microscopy confirmed the generation of closed vesicles with an approximate size range between 50 and 600â¯nm. Adhesion of extracellular vesicles to epithelial cells was upregulated upon stimulation of the latter with tumor necrosis factor-α. Adhesion was blocked by an anti-CD18 antibody, by peptides containing the sequence RGD and, to a lesser extent, by an antibody to ICAM-1. The same molecules also blocked the upregulation of the synthesis of interleukin-8 and monocyte chemotactic protein-1 induced by extracellular vesicles. CD18-mediated adhesion of extracellular vesicles is a prerequisite for their proinflammatory activity.
Palabras clave
Texto completo:
1
Colección:
01-internacional
Banco de datos:
MEDLINE
Asunto principal:
Adhesión Celular
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Interleucina-8
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Células Epiteliales
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Vesículas Extracelulares
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Inflamación
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Pulmón
Límite:
Humans
Idioma:
En
Revista:
Exp Cell Res
Año:
2018
Tipo del documento:
Article
País de afiliación:
Italia