Gingipains disrupt F-actin and cause osteoblast apoptosis via integrin ß1.
J Periodontal Res
; 53(5): 762-776, 2018 Oct.
Article
em En
| MEDLINE
| ID: mdl-29777544
ABSTRACT
BACKGROUND AND OBJECTIVE:
The aim of this study was to explore the cellular mechanisms underlying gingipain-caused changes in cell morphology and apoptosis of osteoblasts. MATERIAL ANDMETHODS:
Human calvarial osteoblasts and mouse osteoblasts MC3T3-E1 were treated with gingipain extracts from Porphyromonas gingivalis stain W83. Apoptosis was detected with annexin V and propidium iodide flow cytometry analysis or terminal deoxynucleotidyl transferase mediated dUTP nick-end labeling staining. F-actin was determined by immunostaining. Western blotting was used to detect protein expression. Knocking down and overexpressing approaches were used to determine the role of integrin ß1.RESULTS:
Osteoblasts exposed to gingipain extracts displayed increased apoptosis, accompanied by loss of F-actin integrity and cell shrinkage. The effects of gingipain extracts were abolished by the cysteine protease inhibitor N-tosyl-l-lysyl chloromethyl-ketone. Notably, gingipain extracts resulted in reduction of integrin ß1, accompanied by diminished active RhoA whereas without effect on the total RhoA. Knockdown of integrin ß1 resembled those seen in gingipain-treated osteoblasts. By contrast, the effects of gingipain extracts were abrogated by either overexpression of integrin ß1 or presence of RhoA agonist CN03.CONCLUSION:
Gingipain-induced F-actin disruption and apoptosis are mediated by the degradation of integrin ß1 and inhibition of RhoA activity, which account for osteoblast apoptosis.Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Osteoblastos
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Cisteína Endopeptidases
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Actinas
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Apoptose
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Adesinas Bacterianas
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Integrina beta1
Limite:
Animals
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Humans
Idioma:
En
Revista:
J Periodontal Res
Ano de publicação:
2018
Tipo de documento:
Article
País de afiliação:
China