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Methyl methacrylate induced changes in CNS activity.
Department of Physiology and Biophysics, Temple University, Philadelphia, Pennsylvania, Terminal Progress Report 1980 Jan; :1-10
Experiments were performed to determine if methyl-methacrylate (80626) (MMA) monomer vapor in air caused central nervous system (CNS) changes in exposed rats. Rats were exposed to 400 parts per million (ppm) MMA vapor for 60 minutes. The only significant changes to develop occurred in the lateral hypothalamic and ventral hippocampal nuclei. Several substudies conducted to better understand these results suggested that the changes in the hippocampal neuronal firing rates were related to the perception of the MMA odor and dependent on the presence of an intact nervous connection to the receptors in the nose. In a subchronic study animals were exposed for 2 to 10 weeks to 400ppm MMA vapor. No consistent long term changes in neuronal activity were detected. However, a decrease in neuronal activity was detected during the first week of exposure. In another study the exposure levels of MMA ranged from 50 to 800ppm. The lateral hypothalamic and ventral hippocampal nuclei responded as before, but not at the 50ppm level. From this data the author concludes that the threshold exposure concentration for the observed effects are the same as or slightly less than the current threshold limit value for MMA vapor in the workplace.
NIOSH-Grant; Plastics-industry; Nervous-system-disorders; Inhalation-studies; Vapors; Laboratory-animals; Central-nervous-system; Toxic-effects
Physiology and Biophysics Temple University Physiology and Biophysics Dept Philadelphia, PA 19140
Final Grant Report
NTIS Accession No.
Department of Physiology and Biophysics, Temple University, Philadelphia, Pennsylvania, Terminal Progress Report
Temple University, Philadelphia, Pennsylvania
Page last reviewed: April 12, 2019
Content source: National Institute for Occupational Safety and Health Education and Information Division