Stem cell factor is implicated in microenvironmental interactions and cellular dynamics of chronic lymphocytic...

Area of Science:

• Hematology
• Oncology
• Immunology

Background:

• Stem cell factor (SCF), the ligand for the c-kit receptor, is implicated in cancer progression.
• Elevated SCF levels have been observed in chronic lymphocytic leukemia (CLL), but its role is unclear.

Purpose of the Study:

• To investigate the role of SCF in CLL pathophysiology.
• To determine the correlation between SCF expression and prognostic markers in CLL.
• To explore SCF as a potential therapeutic target in CLL.

Main Methods:

• Quantification of SCF expression in CLL cells versus healthy B cells.
• Analysis of SCF correlation with prognostic biomarkers, treatment-free interval, and overall survival.
• Investigation of factors influencing SCF levels, including microenvironmental stimuli and therapeutic agents.
• Assessment of SCF's direct biological effects on CLL cells.

Main Results:

• CLL cells predominantly express the membrane isoform of SCF, leading to robust c-kit activation.
• SCF was significantly overexpressed in CLL cells and correlated with adverse prognostic biomarkers, shorter time-to-first treatment, and shorter overall survival.
• SCF levels increased with immune receptor activation and mesenchymal stroma interactions, particularly in high-risk CLL.
• Oxidative stress suppression and ibrutinib treatment reduced SCF levels.
• SCF correlated with mitochondrial dynamics and HIF-1a, factors linked to CLL aggressiveness.
• SCF directly impacted CLL cell redox homeostasis and proliferation.

Conclusions:

• Aberrantly expressed SCF in CLL cells acts as a key regulator in response to microenvironmental cues and is associated with poor prognosis.
• Targeting SCF presents a potential novel therapeutic strategy for managing CLL.