Differential Expression of miR-155 and miR-21 in Tumor and Stroma Cells in Diffuse Large B-Cell Lymphoma

TY - JOUR

T1 - Differential Expression of miR-155 and miR-21 in Tumor and Stroma Cells in Diffuse Large B-Cell Lymphoma

AU - Munch-Petersen, Helga D

AU - Ralfkiaer, Ulrik

AU - Sjö, Lene D

AU - Hother, Christoffer

AU - Asmar, Fazila

AU - Nielsen, Boye S

AU - Brown, Peter

AU - Ralfkiaer, Elisabeth

AU - Grønbæk, Kirsten

PY - 2015/3/27

Y1 - 2015/3/27

N2 - OncomiRs miR-21 and miR-155 have been linked to lymphomagenesis, but information on their implication in diffuse large B-cell lymphoma (DLBCL) is limited. Here, we used locked nucleic acid-based in situ hybridization (ISH) detection techniques on formalin-fixed paraffin-embedded DLBCL tissue samples to identify miR-155 and miR-21 at the cellular level in 56 patients diagnosed with DLBCL, and compared them to miR array data. miR-155 was observed in tumor cells in 19/56 (33.9%) of the samples evaluated by ISH. miR-21 was localized to the stromal compartment in 41/56 (73.2%). A subset of these, 16/56 (28.6%), also showed labeling in tumor cells. When comparing ISH-scores and miR array data, miR-155 in tumor cells, identified by ISH, was associated with miR-155 expression in miR array data (P=0.030). Equally, miR-21 expression by miR array data were highly associated with miR-21 ISH-scores in the stromal cells (P=0.002), whereas no association between miR array data and ISH of miR-21 in tumor cells was observed (P=0.673). We found no association of miR-155 and miR-21 with overall survival or germinal center B-cell-like (GCB) versus non-GCB-like subtypes of DLBCL. In conclusion, miR-ISH added to the biological interpretation of miR expression in DLBCL compared with miR array data, but miR-155 and miR-21 ISH did not add prognostic information in this series.

AB - OncomiRs miR-21 and miR-155 have been linked to lymphomagenesis, but information on their implication in diffuse large B-cell lymphoma (DLBCL) is limited. Here, we used locked nucleic acid-based in situ hybridization (ISH) detection techniques on formalin-fixed paraffin-embedded DLBCL tissue samples to identify miR-155 and miR-21 at the cellular level in 56 patients diagnosed with DLBCL, and compared them to miR array data. miR-155 was observed in tumor cells in 19/56 (33.9%) of the samples evaluated by ISH. miR-21 was localized to the stromal compartment in 41/56 (73.2%). A subset of these, 16/56 (28.6%), also showed labeling in tumor cells. When comparing ISH-scores and miR array data, miR-155 in tumor cells, identified by ISH, was associated with miR-155 expression in miR array data (P=0.030). Equally, miR-21 expression by miR array data were highly associated with miR-21 ISH-scores in the stromal cells (P=0.002), whereas no association between miR array data and ISH of miR-21 in tumor cells was observed (P=0.673). We found no association of miR-155 and miR-21 with overall survival or germinal center B-cell-like (GCB) versus non-GCB-like subtypes of DLBCL. In conclusion, miR-ISH added to the biological interpretation of miR expression in DLBCL compared with miR array data, but miR-155 and miR-21 ISH did not add prognostic information in this series.

KW - Adult

KW - Aged

KW - Aged, 80 and over

KW - Female

KW - Gene Expression Regulation, Neoplastic

KW - Humans

KW - Lymphoma, Large B-Cell, Diffuse

KW - Male

KW - MicroRNAs

KW - Middle Aged

KW - RNA, Neoplasm

KW - Stromal Cells

U2 - 10.1097/PAI.0000000000000073

DO - 10.1097/PAI.0000000000000073

M3 - Journal article

C2 - 25265435

SN - 1541-2016

VL - 23

SP - 188

EP - 195

JO - Applied Immunohistochemistry & Molecular Morphology

JF - Applied Immunohistochemistry & Molecular Morphology

IS - 3

ER -