... fromleukocytes can play a role in inflammatory arthritis by inducing the synthesis of MMPs, chemokines and cytokines in SF[11,12]. It could also be shown that, in particular, the synthesis of MMP-1, ... [40].OsteoclastogenesisMacrophages/monocytes are not only involved in inflam-matory reactions, but also in the remodeling processes of the bone. Two studies published in the past year provided newinsights in the role of monocytes ... due to the proliferation of genuine synovial cells such as SF [2] and a massiveinfiltration of inflammatory cells [3]. As a consequence, the inner layer of the synovium, the lining layer, increases...