Gene Expression Profiling of Bone Marrow Endothelial Cells in Patients with Multiple Myeloma

• Published in: Clinical cancer research 2009-09, Vol.15 (17), p.5369-5378
• Main Authors: RIA, Roberto, TODOERTI, Katia, DAMMACCO, Franco, RIBATTI, Domenico, NERI, Antonino, VACCA, Angelo, BERARDI, Simona, LUCE COLUCCIA, Addolorata Maria, DE LUISI, Annunziata, MATTIOLI, Michela, RONCHETTI, Domenica, MORABITO, Fortunato, GUARINI, Attilio, PETRUCCI, Maria Teresa
• Format: Article
• Language: English
• Subjects: Aged; Aged, 80 and over; Antineoplastic agents; Apoptosis - genetics; Apoptosis - physiology; Apoptosis Regulatory Proteins - genetics; Apoptosis Regulatory Proteins - metabolism; Biological and medical sciences; Bone Marrow Cells - metabolism; Cell Proliferation; Down-Regulation - genetics; Down-Regulation - physiology; endothelial cells; Endothelial Cells - metabolism; Gene Expression Profiling; Gene Silencing - physiology; Hematologic and hematopoietic diseases; human umbilical vascular endothelial cells; Humans; Immunodeficiencies. Immunoglobulinopathies; Immunoglobulinopathies; Immunopathology; Leukemias. Malignant lymphomas. Malignant reticulosis. Myelofibrosis; Medical sciences; Membrane Proteins - genetics; Membrane Proteins - metabolism; Middle Aged; monoclonal gammopathy of undetermined significance; multiple myeloma; Multiple Myeloma - genetics; Multiple Myeloma - metabolism; Pharmacology. Drug treatments; Proto-Oncogene Proteins - genetics; Proto-Oncogene Proteins - metabolism; RNA, Small Interfering - metabolism; Selenoprotein W - genetics; Selenoprotein W - metabolism; Up-Regulation - genetics; Up-Regulation - physiology
• ISSN: 1078-0432; 1557-3265
• DOI: 10.1158/1078-0432.CCR-09-0040

Purpose: To determine a “gene/molecular fingerprint” of multiple myeloma endothelial cells and identify vascular mechanisms governing the malignant progression from quiescent monoclonal gammopathy of undetermined significance. Experimental Design: Comparative gene expression profiling of multiple myeloma endothelial cells and monoclonal gammopathy of undetermined significance endothelial cells with the Affymetrix U133A Arrays was carried out in patients at diagnosis; expression and function of selective vascular markers was validated by real-time reverse transcriptase-PCR, Western blot, and small interfering RNA analyses. Results: Twenty-two genes were found differentially expressed (14 down-regulated and eight up-regulated) at relatively high stringency in multiple myeloma endothelial cells compared with monoclonal gammopathy of undetermined significance endothelial cells. Functional annotation revealed a role of these genes in the regulation of extracellular matrix formation and bone remodeling, cell adhesion, chemotaxis, angiogenesis, resistance to apoptosis, and cell-cycle regulation. Validation was focused on six genes ( DIRAS3, SERPINF1, SRPX, BNIP3, IER3 , and SEPW1 ) not previously found to be functionally correlated to the overangiogenic phenotype of multiple myeloma endothelial cells in active disease. The small interfering RNA knockdown of BNIP3, IER3 , and SEPW1 genes affected critical multiple myeloma endothelial cell functions correlated with the overangiogenic phenotype. Conclusions: The distinct endothelial cell gene expression profiles and vascular phenotypes detected in this study may influence remodeling of the bone marrow microenvironment in patients with active multiple myeloma. A better understanding of the linkage between plasma cells and endothelial cells in multiple myeloma could contribute to the molecular classification of the disease and thus pinpoint selective gene targets for more effective antiangiogenic treatments. (Clin Cancer Res 2009;15(17):5369–78)