The intercellular adhesion molecule vascular cell adhesion molecule-1 (VCAM-1) has been implicated in a number of interactions between leukocytes and cells of lymphoid and connective tissue, including endothelial cells. Such interactions within synovial tissue may be important in the pathogenesis of rheumatoid arthritis.
The expression of VCAM-1 on specific cell populations in normal and inflamed synovium was investigated using a range of double-labeling techniques.
The strongest VCAM-1 staining was found to be confined to four nonmacrophage populations (as judged in terms of CD68 expression, nonspecific esterase activity, content of prolyl hydroxylase and activity of uridine diphosphoglucose dehydrogenase): (i) type B synoviocytes, (ii) vascular wall cells outside the endothelial layer, (iii) scattered stromal cells with cytoplasmic processes, and (iv) cells resembling follicular dendritic reticulum cells in lymphoid aggregates with germinal centers (in the three samples of rheumatoid arthritic tissue where these were present). Some macrophages of the synovial intima showed weak VCAM-1 staining. Endothelial cell staining was seen but it was consistently weaker than the staining of cells of group ii.
The four cell populations described as showing bright staining for VCAM-1 may all be involved in local interactions with leukocytes of the macrophage or lymphoid series subsequent to initial leukocyte entry into the tissue. Expression of VCAM-1 by these cells may play a role in such interactions.