Abstract：
:Exposing rats to the anticholinesterase (anti-ChE) diisopropyl fluorophosphate (DFP) causes a transient period of hypothermia followed by a period of hyperthermia lasting approximately 48 h. Because a fever is a predominant thermoregulatory response in humans exposed to anti-ChE pesticides, the hyperthermic response in the rat may be important to understanding the central neural mechanisms of anti-ChEs. The purpose of the present study was to assess the dependence of DFP-induced thermoregulatory changes on basal behavioral and autonomic activity in the rat. Core temperature (Tc), heart rate (HR), and motor activity (MA) were monitored via radiotelemetry in unrestrained rats 24 h prior to and 72 h after administration of the peanut oil vehicle or 1.5 mg/kg DFP. Mean Tc decreased by approximately 4 degrees C by 4 h after DFP, returned to baseline by 27 h, and then remained approximately 0.8 degrees C above control daytime levels during the second day after DFP injection. Correlations of DFP-induced hypothermia and hyperthermia with baseline Tc, HR, and MA were performed. The baseline Tc was inversely correlated with the magnitude of DFP-induced hyperthermia (r2 = 0.6). DFP-induced hyperthermia was also inversely correlated with baseline HR and MA. The minimum core temperature during DFP-induced hypothermia was directly correlated with the baseline Tc. The inverse pattern between baseline Tc and DFP-induced hyperthermia is similar to that of rats administered endotoxin and other pyrogenic agents. Sixty percent of the variation in DFP-induced hyperthermia, a toxic response seen > 48 h after exposure, can be explained by individual differences in baseline Tc. This relationship may be important in understanding the thermoregulatory and metabolic effects of anti-ChE agents.
journal_name
Neurotoxicol Teratoljournal_title
Neurotoxicology and teratologyauthors
Gordon CJdoi
10.1016/0892-0362(95)02001-2subject
Has Abstractpub_date
1995-11-01 00:00:00pages
679-83issue
6eissn
0892-0362issn
1872-9738pii
0892036295020012journal_volume
17pub_type
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journal_title：Neurotoxicology and teratology
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journal_title：Neurotoxicology and teratology
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journal_title：Neurotoxicology and teratology
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