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Modulation of nitrogen dioxide toxicity by lithium.

F S Messiha, J McGrath

Pharmacology, Biochemistry, and Behavior

|January 1, 1984

Summary

Lithium chloride (LiCl) pretreatment reduced mortality in mice exposed to nitrogen dioxide (NO2) toxicity. LiCl may protect against NO2 injury by stabilizing cell membranes and modulating pulmonary responses.

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Area of Science:

Toxicology
Biochemistry
Pharmacology

Background:

Nitrogen dioxide (NO2) is a toxic environmental pollutant.
Understanding protective mechanisms against NO2 toxicity is crucial for public health.
Liver enzymes play a role in detoxification pathways.

Purpose of the Study:

To investigate the protective effects of short-term lithium chloride (LiCl) intake against NO2 toxicity in mice.
To examine the impact of LiCl and NO2 exposure on liver enzyme activities, specifically alcohol dehydrogenase (L-ADH) and aldehyde dehydrogenases (L-ALDH).

Main Methods:

Mice were pretreated with LiCl in drinking fluid for 10 days.
Mice were exposed to varying concentrations of NO2.
Mortality rates, liver weight, body weight gain, and specific activities of L-ADH and L-ALDH were measured.

Main Results:

LiCl pretreatment significantly decreased mortality in mice exposed to high concentrations of NO2.
LiCl treatment led to decreased liver weight and reduced body weight gain in mice exposed to NO2.
NO2 exposure inhibited cytoplasmic L-ALDH activity, while LiCl pretreatment induced mitochondrial L-ALDH activity.

Conclusions:

LiCl demonstrates a protective effect against NO2 toxicity in mice.
The mechanism may involve Li+ stabilizing cell membranes and modulating pulmonary responses to NO2 injury.
LiCl alters liver aldehyde dehydrogenase activity, suggesting a role in detoxification pathways.

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