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Osteoclasts are bone-resorbing cells that play an essential role in homeostatic bone remodeling and pathological bone erosion. Macrophage colony stimulating factor (M-CSF) is abundant in rheumatoid arthritis (RA). However, the role of M-CSF in arthritic bone erosion is not completely understood. Here, we show that M-CSF can promote osteoclastogenesis by triggering the proteolysis of c-FMS, a receptor for M-CSF, leading to the generation of FMS intracellular domain (FICD) fragments. Increased levels of FICD fragments positively regulated osteoclastogenesis but had no effect on inflammatory responses. Moreover, myeloid cell-specific FICD expression in mice resulted in significantly increased osteoclast-mediated bone resorption in an inflammatory arthritis model. The FICD formed a complex with DAP5, and the FICD/DAP5 axis promoted osteoclast differentiation by activating the MNK1/2/EIF4E pathway and enhancing NFATc1 protein expression. Moreover, targeting the MNK1/2 pathway diminished arthritic bone erosion. These results identified a novel role of c-FMS proteolysis in osteoclastogenesis and the pathogenesis of arthritic bone erosion., (© 2021. The Author(s).)

Cholangiocarcinoma is one of the most aggressive malignancies. Patients with advanced or metastatic disease have a particularly dismal prognosis. The role of chemotherapy remains a matter of debate. A number of recent trials have shown that capecitabine in combination with other agents seems to be active as first-line treatment in advanced biliary cancer. Clinical data regarding the activity of capecitabine in pretreated patients are limited. In this report we describe a patient with previously treated, metastatic cholangiocarcinoma who developed stabilization of the disease for 7 months following chemotherapy with capecitabine. The patient had previously received 2 lines of chemotherapy. Capecitabine was tolerated fairly well without serious adverse events. We consider this observation to be important given the absence of active, non-surgical treatments in unresectable tumors.

The purpose of the study was to examine prospectively the efficacy and safety of the combination of intravenous pulses of cyclophosphamide and methylprednizolone, in the treatment of scleroderma lung disease. Thirteen patients were treated with the above combination for up to 24 months. Prior to this treatment, they underwent a pulmonary function evaluation and high resolution computed tomography (HRCT). Carbon monoxide diffusion lung capacity and forced vital capacity were repeated at 6, 12, 24 and 48 months. HRCT was repeated at the end of the treatment period, but in between and afterwards in some patients, as well. A significant percentage of patients (66.6%) showed stabilization or improvement of their pulmonary function. Patients with already seriously compromised function, before treatment, were the least likely to exhibit this evolution pattern. There was a tendency in some individuals to deteriorate on later evaluations, off treatment, although they had stabilized at the end of the treatment. There was rather a poor correlation between functional evolution and HRCT appearance. Finally, the regimen was well tolerated. Our results suggest that the employed combination is safe and effective, mainly in stabilizing the respiratory function of the patients. This goal is more realistic when treatment is given before significant functional compromise has ensued. The need for long-term immunosuppression to maintain the initial favorable response is suggested.