NAD(P)H oxidase activity of Nox4 in chondrocytes is both inducible and involved in collagenase expression.
Antioxid Redox Signal
; 8(9-10): 1485-96, 2006.
Article
en En
| MEDLINE
| ID: mdl-16987005
ABSTRACT
Reactive oxygen species (ROS) are regulators of redox-sensitive cell signaling pathways. In osteoarthritis, human interleukin-1beta is implicated in cartilage destruction through an ROS-dependent matrix metalloproteinase production. To determine the molecular source of ROS production in the human IL-1beta (hIL-1beta)-sensitive chondrocyte immortalized cell line C-20/A4, transfected cells were constructed that overexpress NAD(P)H oxidases. First, RT-PCR analysis showed that the C-20/A4 cell line expressed Nox2, Nox4, p22( phox ), and p67( phox ), but not p47( phox ). It was found that ROS production by C-20/A4 chondrocytes does not depend on PMA and ionomycin activation. This indicates that Nox2 was not involved in the production of ROS. In C- 20/A4 cells that overexpress Nox4, hIL-1beta stimulated ROS production three times more than the normal production of C-20/A4 cells. Moreover, there was a fourfold increase in the production of collagenase (MMP-1) by chondrocytes that overexpress Nox4. Interestingly, MMP-1 production in cells that overexpress Nox2 was not sensitive to hIL-1beta. These data suggest that under hIL-1beta stimulation, C-20/A4 chondrocytes produce MMP-1 through a Nox4-mediated, ROS-dependent pathway.
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Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Colagenasas
/
NADPH Oxidasas
/
Condrocitos
Límite:
Humans
Idioma:
En
Revista:
Antioxid Redox Signal
Asunto de la revista:
METABOLISMO
Año:
2006
Tipo del documento:
Article