Visualizing Lysosomal Positioning with a Fluorescent Probe Reveals a New Synergistic Anticancer Effect

Area of Science:

• Cell Biology
• Cancer Therapeutics
• Fluorescent Probes

Background:

• Lysosome dynamics are crucial for cellular functions and cancer development.
• Understanding lysosome behavior can lead to novel cancer treatment strategies.

Purpose of the Study:

• To develop a fluorescent probe for visualizing lysosome dynamics.
• To investigate lysosome behavior in response to stimuli.
• To identify new anticancer therapeutic approaches targeting lysosomes.

Main Methods:

• Development of NIM-3, a lysosome-targetable fluorescent probe with high selectivity, photostability, and low cytotoxicity.
• Utilizing NIM-3 for spatial and temporal imaging of lysosomal dynamics.
• Analyzing lysosomal positioning and behavior in various cell types.

Main Results:

• NIM-3 enabled the definition of three distinct types of lysosome motion.
• Observed perinuclear accumulation of lysosomes upon stimulation with pro-inflammatory cytokines.
• Disclosed a potential anticancer therapy combining chloroquine (CQ) and tumor necrosis factor alpha (TNFα).
• Verified the efficacy of the "CQ + TNFα" treatment across diverse human cancer cells.
• Anticancer mechanism potentially linked to lysosomal dilation.

Conclusions:

• The developed fluorescent probe NIM-3 is effective for studying lysosome dynamics.
• Lysosome behavior, including perinuclear accumulation, can be modulated by external stimuli.
• The combination of CQ and TNFα represents a promising new strategy for cancer therapy, potentially through lysosomal dilation.