Evaluation of sensory evoked potentials in Long Evans rats gestationally exposed to mercury (Hg0) vapor
| Autor: | Sushmita M. Chanda, Daniel L. Morgan, Jaimie E. Graff, Stanley Barone, Robert P. Beliles, David W. Herr |
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| Rok vydání: | 2004 |
| Předmět: |
Male
Cerebellum medicine.medical_specialty Organogenesis Sensory system Stimulus (physiology) Toxicology Somatosensory system Nerve conduction velocity Pregnancy Internal medicine Evoked Potentials Somatosensory Administration Inhalation Peripheral Nervous System medicine Animals Birth Weight Rats Long-Evans Evoked potential Chemistry Body Weight Mercury Rats Electrophysiology medicine.anatomical_structure Endocrinology Animals Newborn Anesthesia Peripheral nervous system Prenatal Exposure Delayed Effects Mercury Poisoning Evoked Potentials Visual Female Volatilization |
| Zdroj: | Toxicological sciences : an official journal of the Society of Toxicology. 82(1) |
| ISSN: | 1096-6080 |
| Popis: | Mercury is known to alter neuronal function and has been shown to cross the placental barrier. These experiments were undertaken to examine if gestational exposure to mercury vapor (Hg(0)) would result in alterations in sensory neuronal function in adult offspring. Dams were exposed to 0 or 4 mg/m(3) Hg(0) for 2 h/day from gestational days 6-15. This exposure paradigm has been shown to approximate a maximal tolerated dose of Hg(0) for the dams. Between postnatal days 140-168, male and female offspring (one of each gender/dam) were examined using a battery of sensory evoked potentials. Peripheral nerve action potentials, nerve conduction velocity, somatosensory evoked responses (cortical and cerebellar), brainstem auditory evoked responses, pattern evoked potentials, and flash evoked potentials were quantified. Gestational exposure to 4 mg/m(3) Hg(0) did not significantly alter any of the evoked responses, although there was a suggestion of a decrease in compound nerve action potential (CNAP) amplitudes in male animals for the 3 mA stimulus condition. However, this possible change in CNAP amplitudes was not replicated in a second experiment. All evoked potentials exhibited predictable changes as the stimulus was modified. This shows conclusively that the evoked responses were under stimulus control, and that the study had sufficient statistical power to detect changes of these magnitudes. These results indicate that gestational exposure to 4 mg/m(3) Hg(0) did not result in changes in responses evoked from peripheral nerves, or the somatosensory, auditory, or visual modalities. |
| Databáze: | OpenAIRE |
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