Organometal-induced antinociception: a time- and dose-response comparison of triethyl and trimethyl lead and tin
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Abstract:
Recent reports have demonstrated that organolead and -tin compounds can alter behavioral reactivity to noxious stimuli. To further define the dose response and temporal characteristics of these neurobehavioral effects, male Fischer 344 rats were injected sc with either one-fourth, one-half, or three-fourths the acute LD50 of triethyl lead (TEL), triethyl tin (TET), trimethyl lead (TML), trimethyl tin (TMT), or distilled water and tested on a 57.5 degrees C hot plate 1, 7, 14, 21, and 28 days after dosing. All four organometals altered hot plate latencies, but the magnitude and time course of these effects differed among the compounds. TEL produced a dose-related increase in latencies which was maximal 1 and 7 days postdosing and had dissipated by 28 days. In contrast, the group administered TML (3/4 LD50) exhibited a late developing antinocioception which became evident 14 days after dosing and persisted throughout the period of testing. The intermediate dose of TMT (1/2 LD50) also produced a delayed increase in response times which was observed 21 and 28 days post-treatment. The 3/4 LD50 dose of TMT produced increased hot plate latencies on all post-treatment test days except Day 14. TET (1/2 LD50) produced increased hot plate latencies 1, 7, 14, and 21 days postdosing and also induced a reversible ataxia and akinesia. Higher doses of TET proved lethal to 80% of the animals and lower doses failed to alter response times in the hot plate. These data demonstrate that trialkyl lead and tin compounds can produce time- and dose-related increases in hot plate latencies.
Insights
Organolead and organotin compounds alter pain responses in rats. Different compounds show varied effects on hot plate latencies over time, with some causing delayed antinociception.
Area of Science:
- Neurotoxicology
- Behavioral Neuroscience
- Environmental Health
Background:
- Organolead and organotin compounds are known environmental contaminants.
- Previous studies suggest these compounds can affect behavioral responses to pain.
Purpose of the Study:
- To investigate the dose-response and temporal effects of various organolead and organotin compounds on pain reactivity.
- To compare the neurobehavioral effects of triethyl lead (TEL), triethyl tin (TET), trimethyl lead (TML), and trimethyl tin (TMT).
Main Methods:
- Male Fischer 344 rats were subcutaneously injected with varying doses (1/4, 1/2, 3/4 LD50) of TEL, TET, TML, TMT, or distilled water.
- Animals were tested on a 57.5°C hot plate at 1, 7, 14, 21, and 28 days post-dosing to measure antinociceptive effects.
- Behavioral observations for ataxia and akinesia were also recorded.
Main Results:
- All four organometallic compounds altered hot plate latencies, with distinct dose and time-course effects.
- Triethyl lead (TEL) showed a dose-related increase in latency, peaking at 1-7 days.
- Trimethyl lead (TML) induced a delayed antinociception evident from day 14 onwards.
- Trimethyl tin (TMT) and triethyl tin (TET) also demonstrated delayed effects on hot plate latencies, with TET also causing reversible ataxia and akinesia.
Conclusions:
- Trialkyl lead and tin compounds exhibit differential neurobehavioral effects on pain sensitivity.
- The observed effects are both time- and dose-dependent, highlighting the complexity of organometallic neurotoxicity.
- These findings contribute to understanding the specific neurotoxic profiles of different organometallic compounds.
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