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The autocrine motility factor receptor is overexpressed on the surface of B cells in Binet C chronic lymphocytic leukemia.

Journal article
Authors Sofia Grund
Bob Olsson
Margareta Jernås
Stefan Jacobsson
Birgitta Swolin
Ivan R Nabi
Lena M S Carlsson
Hans Wadenvik
Published in Medical Oncology
Volume 28
Issue 4
Pages 1542-8
ISSN 1559-131X
Publication year 2011
Published at Institute of Biomedicine, Department of Clinical Chemistry and Transfusion Medicine
Institute of Neuroscience and Physiology, Department of Psychiatry and Neurochemistry
Institute of Medicine
Institute of Medicine, Department of Internal Medicine
Institute of Medicine, Department of Molecular and Clinical Medicine
Pages 1542-8
Language en
Links dx.doi.org/10.1007/s12032-010-9555-...
Subject categories Dermatology and Venereal Diseases

Abstract

Chronic lymphocytic leukemia (CLL) is a heterogeneous disease with a clinical spectrum reaching from discrete lymphocytosis to extensive enlargement of lymph nodes, spleen and liver, and bone marrow failure. The aim of this study was to identify genes that differentiate between patients with disease stage A vs. C according to Binet in order to better understand the disease. To achieve this, we performed DNA microarray analysis on B cells from CLL patients with stage A and C according to Binet and matched controls. Between CLL patients and controls, there were 1,528 differentially expressed genes and 360 genes were differentially expressed between Binet A and C patients. Due to the sheer number of regulated genes, we focused on the autocrine motility factor receptor (AMFR). AMFR has not previously been investigated in hematological disorders, but high expression of AMFR correlates with a more advanced stage and invasive potential in several human tumors. AMFR mRNA expression was higher in Binet A compared with Binet C patients (P=0.0053) and healthy controls (P=0.0051). Total AMFR protein was higher in Binet A patients compared to Binet C as analyzed by intracellular flow cytometry. However, AMFR exist both in the ER involved in protein degradation and on the cell surface involved in metastasis and cell motility. Cell surface AMFR was increased in Binet C compared with Binet A+B (P=0.016). In conclusion, the mRNA levels reflect the total amount of AMFR, whereas cell surface expression is associated with progression in CLL.

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