IngentaConnect Myeloma cell expression of 10 candidate genes for osteolytic bone...

Authors: Haaber, Jacob; Abildgaard, Niels¹; Knudsen, Lene Meldgaard¹; Dahl, Inger Marie²; Lodahl, Marianne³; Thomassen, Mads⁴; Kerndrup, Gitte Birk⁵; Rasmussen, Thomas³

Source: British Journal of Haematology, Volume 140, Number 1, January 2008 , pp. 25-35(11)

Publisher: Blackwell Publishing

Abstract:

Summary

Osteolytic bone disease (OBD) in multiple myeloma (MM) is caused by interactions between MM cells and the bone marrow microenvironment and is characterized by increased osteoclastic bone resorption and decreased osteoblastic bone formation. Recently, the role of osteoblast inhibition has come into focus, especially the possible role of overexpression of DKK1, an inhibitor of the Wnt signalling pathway. Further, CKS2, PSME2 and DHFR have also been reported as candidate genes for OBD. We studied the gene expression by quantitative reverse transcription polymerase chain reaction of TNFSF11 (RANKL), TNFSF11A (RANK), TNFRSF11B (OPG), CCL3 (MIP1A), CCL4 (MIP1B), PTHR1 (PTHrp), DKK1, CKS2, PSME2 and DHFR in purified, immunophenotypic FACS-sorted plasma cells from 171 newly diagnosed MM patients, 20 patients with monoclonal gammopathy of undetermined significance and 12 controls. The gene expressions of the analysed genes were correlated with radiographically assessed OBD. Only overexpression of DKK1 was correlated to the degree of OBD. Myeloma cells did not express TNFSF11A, TNFSF11, or TNFRSF11B, and very rarely expressed CCL3 and PTHR11. CCL4, CKS2, PSME2 and DHFR were variably expressed, but the expression of these genes showed no correlation with OBD. In contrast, loss of PSME2 expression in MM plasma cells was significantly correlated with OBD.

Keywords: multiple myeloma; bone disease; Dickkopf 1; quantitative reverse transcription polymerase chai; fluorescence-activated cell sorting

Document Type: Research article

DOI: 10.1111/j.1365-2141.2007.06871.x

Affiliations: 1: Department of Haematology, Odense University Hospital, Odense, Denmark 2: Section of Haematology, Institute of Clinical Medicine, University of Tromsø, Norway 3: Department of Haematology, Herlev Hospital, Copenhagen, Denmark, 4: Human Microarray Centre, University of Southern Denmark, Odense, Denmark 5: Department of Pathology

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Myeloma cell expression of 10 candidate genes for osteolytic bone disease. Only overexpression of DKK1 correlates with clinical bone involvement at diagnosis