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Published on: July 21, 2016
In vitro effect of acetaldehyde on cell-mediated cytotoxicity by murine spleen cells
A S Walia1, K M Pruitt, D L Dillehay
1Alcoholism Research, VA Medical Center, Birmingham, AL 35233.
Insights
Acetaldehyde affects immune cell function, initially boosting antibody-dependent cell-mediated cytotoxicity (ADCC) at low doses but inhibiting it and other immune responses at higher concentrations. These effects occur at the effector cell level.
Area of Science:
- Immunology
- Toxicology
- Cellular Biology
Background:
- Acetaldehyde is a toxic metabolite found in various biological and environmental contexts.
- Understanding its impact on immune cell function is crucial for assessing health risks.
Purpose of the Study:
- To investigate the in vitro effects of acetaldehyde on the lytic functions of murine spleen cells.
- To evaluate the impact on antibody-dependent cell-mediated cytotoxicity (ADCC), natural killer (NK) activity, and alloimmune cytotoxic T lymphocyte (CTL) activity.
Main Methods:
- Murine spleen cells were exposed to varying concentrations of acetaldehyde.
- Lytic capacities were assessed using ADCC, NK activity, and CTL assays.
- Lymphocyte viability was determined by trypan blue exclusion.
- Acetaldehyde degradation kinetics were measured.
Main Results:
- Acetaldehyde exhibited a biphasic effect on ADCC: potentiation at <1 mM and inhibition at >1 mM.
- Inhibitory effects on ADCC were concentration- and time-dependent, acting at the effector cell level and partially irreversible.
- NK activity and alloimmune CTL-mediated lysis were also inhibited by acetaldehyde.
- Acetaldehyde concentrations up to 20 mM did not significantly reduce lymphocyte viability.
- Acetaldehyde was degraded in reaction mixtures with a rate constant of 0.5/hr.
Conclusions:
- Acetaldehyde modulates immune cell lytic functions in a dose-dependent manner.
- The compound can impair critical immune responses like ADCC, NK, and CTL activities.
- These findings highlight the immunotoxic potential of acetaldehyde.
Abstract:
The effects of acetaldehyde in vitro on the lytic capacity of murine spleen cells have been evaluated in three systems: antibody-dependent cell-mediated cytotoxicity (ADCC), natural killer (NK) activity, and alloimmune cytotoxic T lymphocyte (CTL) activity. Acetaldehyde had a biphasic effect on ADCC. Concentrations less than 1 mM acetaldehyde potentiated ADCC. Concentrations greater than 1 mM produced a progressive decrease in lysis. The inhibitory effects were at the effector cell level and were partially irreversible. Preincubation experiments showed that inhibition of ADCC was both concentration and time-dependent. Preincubation of the spleen cells for short periods of time produced potentiated lysis by concentrations of acetaldehyde up to 10 mM. However, potentiation of lysis in preincubation and short term (4h) lytic assay experiments was more variable than longer term (18h) experiments in which the acetaldehyde was not removed by washing. NK activity and alloimmune CTL-mediated lysis were also inhibited by acetaldehyde. Concentrations of acetaldehyde up to 20 mM did not significantly decrease lymphocyte viability as determined by trypan blue exclusion. Acetaldehyde was lost from the reaction mixtures by first order kinetics with a rate constant of 0.5/hr. Thus, the final concentrations were 64-99.99% lower than the starting amounts.
