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Published on: February 21, 2018
Expression of the IL2 receptor alpha, beta and gamma chains in hairy cell leukemia
D de Totero1, A Carbone, P L Tazzari
1Istituto Nazionale per la Ricerca sul Cancro, Genova, Italy.
Insights
Hairy cell leukemia (HCL) cells show distinct interleukin 2 (IL2) receptor chain expression. Variant HCL lacks the IL2 receptor alpha chain, impacting IL2-driven proliferation.
Area of Science:
- Immunology
- Hematology
- Molecular Biology
Background:
- Interleukin 2 (IL2) receptor is crucial for lymphocyte activation and proliferation.
- Hairy cell leukemia (HCL) is a rare B-cell malignancy with distinct subtypes.
- Understanding IL2 receptor expression in HCL subtypes can reveal therapeutic targets.
Purpose of the Study:
- To investigate the expression of IL2 receptor chains (alpha, beta, gamma) in typical and variant HCL.
- To compare IL2 receptor expression in HCL with B-cell chronic lymphocytic leukemia (B-CLL) and normal lymphocytes.
- To assess the role of IL2 receptor components in IL2-mediated proliferation in HCL.
Main Methods:
- Immunofluorescence and mRNA analysis were used to detect IL2 receptor chain expression.
- Cell proliferation assays were performed in the presence of exogenous IL2.
- Stimulation assays were conducted to evaluate the inducibility of the IL2 receptor alpha chain.
Main Results:
- Typical HCL expresses both IL2 receptor alpha and beta chains, while variant HCL expresses beta but not alpha.
- Both HCL types express the IL2 receptor gamma chain (p64).
- B-CLL and normal lymphocytes show weak or negative expression of IL2 receptor alpha and beta chains, and weaker gamma chain expression compared to HCL.
- Variant HCL exhibits a lower proliferative response to IL2 than typical HCL.
- The IL2 receptor alpha chain in variant HCL is not inducible, suggesting CD25 is not essential for IL2-promoted growth in this context.
Conclusions:
- IL2 receptor expression patterns differ significantly between typical and variant HCL.
- The IL2 receptor beta (p75) and gamma (p64) chains play a primary role in IL2 activation and proliferation in HCL.
- IL2 receptor expression is dynamically regulated during B-cell activation and differentiation, with potential implications for HCL pathogenesis.
Abstract:
The expression of the interleukin 2 (IL2) receptor chains was investigated by immunofluorescence and mRNA analysis in typical and variant hairy cell leukemia (HCL) cases. While typical hairy cells express both the alpha and the beta chains, variant HCL express the IL2 receptor beta chain on the surface membrane but not the alpha chain. Both typical and variant HCL have mRNA transcript of the p64 molecule (gamma chain). In B-cell chronic lymphocytic leukemia (B-CLL), EBV-transformed lymphoblastoid cell lines and normal B lymphocytes the expression of the IL2 receptor alpha and beta chains is very weak or negative. Furthermore, in B-CLL the IL2 receptor gamma chain shows a weaker expression compared to HCL. Both classic and variant HCL cases appear capable of proliferating in the presence of exogenous IL2, though the proliferative response of variant HCL appears lower than that of typical cases. Since in variant HCL the IL2 receptor alpha chain could not be induced by different stimuli, it appears that the CD25 antigen may not be essential in the process of IL2-promoted growth, while p75 and p64 play a primary role in IL2 activation. Taken together, it is suggested that the expression of IL2 receptors is up- or down-regulated during the process of B-cell lineage activation and differentiation.
