Citrate shows specific, dose-dependent lympholytic activity in neoplastic cell lines

Area of Science:

• Biochemistry
• Cell Biology
• Oncology

Background:

• Carboxylic acid derivatives (CADs) are being investigated for their biological activities.
• Understanding the effects of CADs on cell death pathways is crucial for therapeutic development.

Purpose of the Study:

• To evaluate the cell membrane destruction activity of tri-sodium citrate and other CADs.
• To assess the potential of tri-sodium citrate in inducing apoptosis in various cancer cell lines and normal human peripheral blood mononuclear cells (hPBMC).
• To investigate the synergistic effects of tri-sodium citrate with antineoplastic drugs on cancer cells.

Main Methods:

• Flow cytometric analysis using Annexin-V and Propidium Iodide (PI) staining.
• Manual cell counts and lactate dehydrogenase (LDH) assays.
• Testing of tri-sodium citrate, ascorbate, acetate, and lactate on multiple cancer cell lines and hPBMC.
• Combination studies of tri-sodium citrate with various antineoplastic drugs on Jurkat cells.

Main Results:

• Tri-sodium citrate demonstrated significant apoptosis-inducing activity in neoplastic cell lines, with lesser effects on normal hPBMC.
• LDH values correlated with enhanced apoptosis observed via FACS analysis.
• Citrate induced a greater degree of apoptosis than acetate and lactate in most tested cell lines.
• Ascorbate induced cell death primarily through necrosis, not apoptosis.
• Citrate showed minimal cell death in hPBMC, even in combination with antineoplastic drugs.

Conclusions:

• Tri-sodium citrate effectively induces apoptosis in cancer cells, offering a potential therapeutic agent.
• The differential effect on cancer versus normal cells suggests a favorable safety profile.
• Citrate may enhance the efficacy or reduce the toxicity of certain chemotherapy regimens.