Expression of vascular cell adhesion molecule-1 mRNA and protein in rheumatoid synovium demonstrated by in situ hybridization and immunohistochemistry - PubMed (original) (raw)
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- PMID: 7531793
Expression of vascular cell adhesion molecule-1 mRNA and protein in rheumatoid synovium demonstrated by in situ hybridization and immunohistochemistry
J Kriegsmann et al. Lab Invest. 1995 Feb.
Abstract
Background: Vascular cell adhesion molecule-1 (VCAM-1) is expressed in synovial tissue of patients with rheumatoid arthritis. VCAM-1-protein has been demonstrated in nonvascular cells beside a vascular expression of this molecule. There are conflicting results about the nonvascular cell types expressing VCAM-1.
Experimental design: For the evaluation of VCAM-1 expression in rheumatoid synovium, this molecule has been demonstrated by alkaline phosphatase anti-alkaline phosphatase (APAAP) technique. Furthermore, VCAM-1 mRNA has been demonstrated by in situ hybridization to evaluate de novo synthesis of this molecule in vivo. To elucidate the nature of the cell types expressing VCAM-1 mRNA, this molecule has been shown by combined in situ hybridization for VCAM-1 and immunohistochemistry in the same tissue section. Double labeling has been performed with anti-collagen type IV monoclonal antibodies to delineate endothelial cells and pericytes and with anti-CD68 antibodies to elucidate the expression of VCAM-1 mRNA in fibroblast-like (type B) or macrophage-like (type A) synoviocytes.
Results: Although it has been reported that VCAM-1 occurs on endothelial cells after cytokine stimulation, we show that vascular expression of VCAM-1 mRNA and protein was minimal and restricted to small vessels beneath the lining cell layer. Further expression of VCAM-1 mRNA could be demonstrated in pericytes outside the collagen type IV containing vascular basement membrane. With respect to the expression of VCAM-1 in the synovial lining layer, we could clearly demonstrate by combined in situ hybridization and immunohistochemistry that CD68 positive cells of the monocyte/macrophage lineage in the lining layer (type A cells) do not express VCAM-1 mRNA and that the expression of VCAM-1 mRNA in the lining layer was restricted to fibroblast-like synoviocytes (type B cells). Scattered stromal cells revealing VCAM-1 mRNA were also CD68 negative.
Conclusions: The strong expression of VCAM-1 in the fibroblast-like cells of RA synovium and the lack of expression in the vascular endothelium suggest that the major role of VCAM-1 appears to be associated with the proliferating synovial cells prone to attach and subsequently invade articular cartilage.
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