Abstract
Bone metastases are a dismal consequence of cancer, causing severe morbidity and reducing the quality of life of patients. Solid tumours such as breast, prostate, lung and kidney cancer showed a marked osteotropism dependent on the special microenvironment provided by bone. Different cellular types are involved in the formation of bone metastases, indeed bone, immune system and tumour cells interact leading to bone lesions. During the bone resorption process, there is an intense cross-talk between immune system cells and osteoclasts (OCs). In particular, T cells release factors and cytokines, which rule osteoclastogenesis, and on the other hand, OCs produce factors that act on T cells, which are mediators of the tumour growth in bone. This review will summarize the main mechanisms of action in cancer-induced bone disease with particular regard to the cross-talk among cells of bone, tumour and immune system, focusing on factors and cytokines released by osteoclast, osteoblast, tumour cells and T cells.
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