期刊
CLINICAL IMMUNOLOGY
卷 132, 期 1, 页码 32-42出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.clim.2009.02.011
关键词
Autoimmunity; Systemic lupus erythematosus; Lupus nephritis; TNF related apoptosis inducing ligand; Apoptosis
类别
资金
- NIH [RO3 AR053704-02]
- Maryland Chapter of the Arthritis
We have previously reported that TRAIL is upregulated on T cells from patients with lupus and that T cell associated TRAIL enhances autoimmune parameters in a murine model of lupus. Whether TRAIL/TRAIL-R interaction plays a role in organ involvement such as lupus nephritis has not yet been asssessed. We demonstrate here that TRAIL, DR4 and DR5 are upregulated in proximal and distal tubules of patients with proliferative lupus nephritis. In vitro, expression of TRAIL, DR4 and DR5 on primary proximal tubular epithelial cells (PTEC) was induced by TNF alpha and IFN gamma. Functionally, TRAIL did not induce apoptosis but rather enhanced the proliferation of PTEC through activation of PI3 kinase/AKT and ERK1/2, increased IL-8 production and upregulated ICAM-1 expression. These data demonstrate that cytokine induced upregulation of TRAIL, DR4 and DR5 in tubules from patients with proliferative lupus nephritis may play a protective role by enhancing PTEC survival white also exerting a proinflammatory effect that may contribute to local inflammation and injury. (C) 2009 Elsevier Inc. All rights reserved.
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