Expression of receptor activator of NF-?B ligand (RANKL) mRNA in human multiple myeloma cells

Abstract
Increased bone resorption is a hallmark of multiple myeloma and a result of excessive osteoclast activation. Recently, the receptor activator of NF-κB ligand (RANKL) was found to be the critical factor for osteoclastogenesis. Studies showed that myeloma cells induce RANKL expression in bone marrow stromal cells, but it remained a controversy whether myeloma cells directly express RANKL.