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A BW Reporter System for Studying Receptor-Ligand Interactions
Published on: January 7, 2019
CD84 is a survival receptor for CLL cells.
I Binsky-Ehrenreich1, A Marom1, M C Sobotta1
1Department of Immunology, Weizmann Institute of Science, Rehovot, Israel.
Oncogene
|February 26, 2013
Summary
Overexpression of CD84, a protein involved in cell survival, is an early event in chronic lymphocytic leukemia (CLL). Blocking CD84 triggers cancer cell death, suggesting new therapeutic strategies for CLL.
Area of Science:
- Immunology
- Oncology
- Molecular Biology
Background:
- Chronic lymphocytic leukemia (CLL) is marked by malignant CD5+ B lymphocyte accumulation, primarily due to reduced apoptosis.
- The role of CD84, a signaling lymphocyte activating molecule family member, in CLL pathogenesis was previously unknown.
Purpose of the Study:
- To investigate the function of CD84 in CLL cells.
- To determine the impact of CD84 expression on CLL cell survival and disease progression.
- To explore therapeutic strategies targeting the CD84 pathway.
Main Methods:
- Quantitative analysis of CD84 expression in CLL patients.
- Investigating the regulatory role of macrophage migration inhibitory factor (MIF) and CD74 on CD84.
- Assessing the effects of CD84 modulation (downregulation and blockade) on CLL cell viability in vitro and in vivo.
- Analyzing CD84 expression changes in patients treated with anti-CD74 (milatuzumab) in a clinical trial.
Main Results:
- CD84 expression is significantly elevated in early-stage CLL and regulated by MIF/CD74.
- CD84 activation enhances CLL cell survival through a signaling cascade.
- CD84 downregulation or blockade induces apoptosis in CLL cells, both in vitro and in vivo.
- Treatment with anti-CD74 (milatuzumab) reduced CD84 expression and correlated with decreased anti-apoptotic proteins (Bcl-2, Mcl-1).
Conclusions:
- Upregulated CD84 is a crucial early survival mechanism in CLL pathogenesis.
- Targeting the CD84-dependent survival pathway offers a promising therapeutic strategy for CLL.
- CD84 represents a potential novel therapeutic target for chronic lymphocytic leukemia.
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