MADEL , Maria-Bernadette

Osteoclasts (OCLs) are multinucleated cells responsible for physiological bone resorption and pathological bone destruction in osteoporosis and chronic inflammation. Recently, our team demonstrated that besides bone resorption, OCLs are immunocompetent cells that, depending on their origin and inflammatory status, induce different immune...

International audience

International audience

Bone destruction relies on interactions between bone and immune cells. Boneresorbing osteoclasts (OCLs) were recently identified as innate immune cells activating T cells toward tolerance or inflammation. Thus, pathological bone destruction not only relies on increased osteoclast differentiation, but also on the presence of inflammatory OCLs...

Increased myelopoiesis is a hallmark of many chronic inflammatory diseases. However, the mechanisms involved in the myeloid skewing of hematopoiesis upon inflammation are still incompletely understood. Here, we identify an unexpected role of bone-resorbing osteoclasts in promoting hematopoietic stem cell (HSC) proliferation and differentiation...

International audience

Long bones from mammals host blood cell formation and contain multiple cell types, including adipocytes. Overabundance of adipocytes in bone marrow is associated with pathological conditions such as age-related osteoporosis or marrow aplasia induced by irradiation or chemotherapy. However, physiological functions of bone marrow adipocytes are...

Long bones from mammals host blood cell formation and contain multiple cell types, including adipocytes. Physiological functions of bone marrow adipocytes are poorly documented. Herein, we used adipocyte-deficient PPARγ-whole body null mice to investigate the consequence of total adipocyte deficiency on bone homeostasis in mice. We first...