CCL3 as Possible Negative Prognostic Factor in Chronic Lymphocytic Leukemia

Area of Science:

• Hematology
• Cancer Biology
• Immunology

Background:

• Chronic lymphocytic leukemia (CLL) development involves both genetic changes and microenvironmental signals.
• Nurse-like cells (NLCs) are key components of the CLL microenvironment, interacting with leukemic cells via chemokines.
• These interactions can affect leukemic cell survival by interfering with programmed cell death.

Purpose of the Study:

• To analyze microenvironmental factors impacting leukemic cell survival in CLL.
• To investigate the association of selected molecules (IL-8, CCL3, JAG1, CD163, BIRC5) with clinical, cytogenetic, and molecular parameters of CLL.
• To assess the expression of these molecules in CLL patient serum and NLC culture medium.

Main Methods:

• Long-term NLC cultures were established from 34 CLL patients' mononuclear cells.
• NLC counts were determined using light microscopy.
• Enzyme-linked immunosorbent assays (ELISAs) quantified IL-8, CCL3, sBIRC5, sCD163, and sJAG1 in serum and culture medium.

Main Results:

• Significant differences in IL-8, sBIRC5, CCL3, sCD163, and sJAG1 concentrations were observed between patient serum and NLC culture medium.
• Higher concentrations of IL-8, CCL3, and JAG1 in the culture medium confirmed the NLC microenvironment's role in their production.
• CCL3 concentration in both serum and medium correlated with NLC count and prognostic factors (Rai stage, WBC, ZAP-70, CD38, CD5/19 expression).

Conclusions:

• The NLC-containing microenvironment is crucial in CLL pathogenesis.
• The chemokine CCL3 serves as a valuable indicator of the CLL microenvironment.
• CLL progression necessitates considering both genetic factors and microenvironmental cell interactions.