Human leukocyte antigen-G molecules are constitutively expressed by synovial fibroblasts and upmodulated in osteoarthritis.
Hum Immunol 2010;
71:342-50. [PMID:
20097242 DOI:
10.1016/j.humimm.2010.01.015]
[Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2009] [Revised: 12/15/2009] [Accepted: 01/15/2010] [Indexed: 11/22/2022]
Abstract
Human leukocyte antigen (HLA)-G molecules are nonclassical HLA class I antigens expressed as membrane bound and soluble isoforms (sHLA-G) with a restricted tissue distribution and anti-inflammatory functions. Because inflammation is involved in the pathogenesis of osteoarthritis (OA), we have analyzed the expression and production of HLA-G molecules in in vitro cultured synovial fibroblasts (SFs) from OA patients and control subjects. We have analyzed the levels of sHLA-G1 and HLA-G5 isoforms by immunoenzymatic assay (enzyme-linked immunosorbent assay) in the SF culture supernatants from six OA patients and six control subjects in 70-day in vitro cultures and after the addition of lipopolysaccharide or recombinant interleukin (IL)-10 (rIL-10). We have confirmed HLA-G modulation by cytofluorimetry and immunofluorescence. The results have demonstrated the spontaneous production of sHLA-G1 molecules by both OA and control SFs. The expression was confirmed by cytofluorimetry and immunofluorescence. OA SFs produce both sHLA-G1 and HLA-G5 molecules during the first 23 days of culture and higher levels of sHLA-G1 during the first 40 days of in vitro culture and after lipopolysaccharide or rIL-10 activation compared with control SFs. The production of HLA-G1 molecules, constitutively expressed by control and OA SFs, is significantly increased in OA, suggesting a possible mechanism to counteract the inflammation of the synovial joints.
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