Epithelial calcium-sensing receptor activation by eosinophil granule protein analog stimulates collagen matrix contraction.
Pediatr Res
; 73(4 Pt 1): 414-9, 2013 Apr.
Article
en En
| MEDLINE
| ID: mdl-23269116
ABSTRACT
BACKGROUND:
Eosinophils reside in normal gastrointestinal tracts and increase during disease states. Receptors for eosinophil-derived granule proteins (EDGPs) have not been identified, but highly cationic molecules, similar to eosinophil proteins, bind extracellular calcium-sensing receptors (CaSRs). We hypothesized that stimulation of CaSRs by eosinophil proteins activates epithelial cells.METHODS:
Caco2 intestinal epithelial cells, AML14.3D10 eosinophils, wild-type (WT) human embryonic kidney 293 (HEK293) cells not expressing CaSRs (HEK-WT), and CaSR-transfected HEK293 cells (HEK-CaSR) were stimulated with an eosinophil protein analog poly-L-arginine (PA) and phosphorylated extracellular signal-regulated kinase (pERK)1 and pERK2 were measured. Functional activation was measured with collagen lattice contraction assays.RESULTS:
Coculture of Caco2 cells with AML14.3D10 eosinophils augmented lattice contraction as compared with lattices containing Caco2 cells alone. PA stimulation of Caco2 lattices augmented contraction. HEK-CaSR stimulation with PA or Ca(2+) resulted in greater pERK activation than that of stimulated HEK-WT cells. PA stimulated greater HEK-CaSR lattice contraction than unstimulated lattices. Contraction of PA-stimulated and PA-unstimulated HEK-WT lattices did not differ.CONCLUSION:
Exposure of intestinal epithelia to the EDGP analog PA stimulates CaSR-dependent ERK phosphorylation and epithelial-mediated collagen lattice contraction. We speculate that EDGP release within the epithelial layers activates the CaSR receptor, leading to matrix contraction and tissue fibrosis.
Texto completo:
1
Banco de datos:
MEDLINE
Asunto principal:
Péptidos
/
Colágeno
/
Receptores Sensibles al Calcio
/
Proteínas en los Gránulos del Eosinófilo
/
Células Epiteliales
/
Mucosa Intestinal
Tipo de estudio:
Prognostic_studies
Límite:
Humans
Idioma:
En
Revista:
Pediatr Res
Año:
2013
Tipo del documento:
Article
País de afiliación:
Estados Unidos