{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,7]],"date-time":"2026-10-07T06:15:10Z","timestamp":1791353710991,"version":"4.3.1"},"reference-count":27,"publisher":"Wiley","issue":"1","license":[{"start":{"date-parts":[[2002,3,25]],"date-time":"2002-03-25T00:00:00Z","timestamp":1017014400000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Br J Haematol"],"published-print":{"date-parts":[[2002,4]]},"abstract":"<jats:p><jats:bold>Summary.\u2002<\/jats:bold> The new members of the tumour necrosis factor (TNF) receptor\u2010ligand family, receptor activator of nuclear factor\u2010\u03baB ligand (RANKL) and its receptor RANK, play a crucial role in osteoclast differentiation and activation. An increased expression of RANKL and\/or RANK may be involved in the excessive bone resorption observed in multiple myeloma (MM). We used immunohistochemistry to study RANK and RANKL expression in bone marrow (BM) biopsies obtained at diagnosis in 15 MM patients, six patients with monoclonal gammopathy of undetermined significance (MGUS) and 10 normal BM biopsies. Plasma cells were not labelled with anti\u2010RANKL or anti\u2010RANK antibodies. In all biopsies, RANKL was expressed in endosteal bone surface, around vessels and in cells characterized by cytoplasmic expansions. These last cells did not express CD45 and were vimentin positive, corresponding to bone marrow stromal cells. Numerous stromal cells expressed RANKL in MM and MGUS specimens, with a greater expression in MM than in MGUS. Very few cells were stained with anti\u2010RANKL in normal BM specimens. With the anti\u2010RANK antibody, small mononuclear cells in the bone microenvironment were positive and were identified as erythroblast cells. In conclusion, we showed that RANKL was expressed in reticular stromal cells, with a greater intensity in myeloma specimens. These results suggest that RANKL overexpressed by bone marrow stromal cells may contribute to the high rate of bone resorption observed in MM.<\/jats:p>","DOI":"10.1046\/j.1365-2141.2002.03417.x","type":"journal-article","created":{"date-parts":[[2003,3,11]],"date-time":"2003-03-11T06:44:05Z","timestamp":1047365045000},"page":"86-92","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":95,"title":["RANK (receptor activator of nuclear factor\u2010\u03baB) and RANKL expression in multiple 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