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Female rats are less susceptible during puberty to the lethal effects of percutaneous exposure to VX
Linnzi K M Wright1,2, Robyn B Lee1, Edward D Clarkson1
1US Army Medical Research Institute of Chemical Defense, 2900 Ricketts Point Rd, Aberdeen Proving Ground, MD 21010, USA.
Abstract:
Nerve agents with low volatility such as VX are primarily absorbed through the skin when released during combat or a terrorist attack. The barrier function of the stratum corneum may be compromised during certain stages of development, allowing VX to more easily penetrate through the skin. However, age-related differences in the lethal potency of VX have yet to be evaluated using the percutaneous (pc) route of exposure. Thus, we estimated the 24 and 48 h median lethal dose for pc exposure to VX in male and female rats during puberty and early adulthood. Pubescent, female rats were less susceptible than both their male and adult counterparts to the lethal effects associated with pc exposure to VX possibly because of hormonal changes during that stage of development. This study emphasizes the need to control for both age and sex when evaluating the toxicological effects associated with nerve agent exposure in the rat model.
Insights
This study found that young female rats are less susceptible to the lethal effects of VX nerve agent exposure through the skin. Age and sex are critical factors in nerve agent toxicity assessments.
Area of Science:
- Toxicology
- Dermal Absorption
- Nerve Agent Research
Background:
- Nerve agents like VX pose significant risks via skin absorption, especially if the skin barrier is compromised.
- The stratum corneum's barrier function can vary with developmental stage, influencing VX penetration.
- Limited data exists on age-related differences in VX lethality via the percutaneous route.
Purpose of the Study:
- To evaluate age- and sex-dependent lethal potency of VX via percutaneous exposure.
- To investigate VX median lethal dose (LD50) in rats during puberty and early adulthood.
- To understand how developmental stages impact VX toxicity through skin.
Main Methods:
- Median lethal dose (LD50) estimation for percutaneous VX exposure.
- Testing in male and female rats at pubescent and early adult stages.
- Assessment of VX lethality at 24 and 48-hour intervals post-exposure.
Main Results:
- Pubescent female rats exhibited lower susceptibility to VX's lethal effects compared to males and adults.
- VX median lethal dose varied significantly based on both age and sex of the rats.
- Hormonal fluctuations during puberty may contribute to observed sex differences in susceptibility.
Conclusions:
- Age and sex are crucial variables that must be controlled in toxicological studies of nerve agents.
- Percutaneous VX exposure demonstrates significant age- and sex-specific lethal potency.
- Findings highlight the need for tailored risk assessments considering demographic factors in nerve agent exposure scenarios.
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