Immunotoxicity of ionic liquid [C₁₄mim]BF₄ in rats

Area of Science:

• Environmental toxicology
• Immunology
• Materials science

Background:

• Ionic liquids (ILs) are salts with low melting points, finding applications in various industries.
• The environmental and health impacts of ILs, particularly their immunotoxicity, require thorough investigation.
• Tetradecyl-methylimidazolium tetrafluoroborate ([C14mim]BF4) is an IL with potential toxicological effects on immune systems.

Purpose of the Study:

• To investigate the immunotoxicity of [C14mim]BF4 in a rat model.
• To evaluate the dose-dependent effects of [C14mim]BF4 on specific and non-specific immunity.
• To assess the recovery of immune function after cessation of exposure.

Main Methods:

• Rats were exposed to three doses of [C14mim]BF4 (12.5, 25, 50 mg/kg) with a recovery group and a control group.
• Blood parameters (WBC, NEU, MID, RBC, PLT), serum immunoglobulins (IgG, IgA, IgM), and spleen immune cell populations (T-lymphocytes, CD4+, CD8+, NK cells) were analyzed.
• Lysozyme levels and T-lymphocyte stimulation index were measured to assess immune function.

Main Results:

• Low doses of [C14mim]BF4 increased WBC, NEU, MID, lysozyme, and T-lymphocyte stimulation index.
• High doses significantly decreased these parameters, alongside RBC, PLT, IgG, IgA, IgM, and NK cells.
• While some recovery was observed after 30 days, immune parameters did not return to normal, with NK cells further declining.

Conclusions:

• [C14mim]BF4 exhibits dose-dependent immunotoxicity in rats.
• Exposure to [C14mim]BF4 damages both specific and non-specific immunity, leading to immune dysfunction.
• Long-term immune system damage, particularly to NK cells, occurs even after exposure cessation.