Abstract
The presence of nerve growth factor (NGF) in the serum of adult male mice was assayed using the chick embryo dorsal root ganglion (DRG) bioassay technique in a serum free N1 supplemented medium. Wide variations in the serum-induced nerve fiber outgrowth response were observed when serum was obtained from animals maintained four per cage. Of 64 mice tested, sera of 7 animals induced a profound nerve fiber outgrowth response while the sera of 57 mice failed to show a similar response. In animals kept in isolation for 7 days prior to the start of the experiment, aggression provoked a marked increase in serum NGF levels. In contrast to the sera of aggression-unprovoked mice, the sera of all aggression-provoked mice stimulated a dense nerve fiber outgrowth. The sera of both groups of mice stimulated an intense proliferation and migration of nonneuronal cells. The neurite outgrowth responses elicited by sera from aggression-provoked and unprovoked mice were completely inhibited by the rabbit anti-NGF antiserum. In conclusion, both crowded housing and aggression in mice may provoke an elevation in the serum NGF levels that can be confirmed by the ganglion bioassay technique.
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Lakshmanan, J. Nerve growth factor levels in mouse serum: Variations due to stress. Neurochem Res 12, 393–397 (1987). https://doi.org/10.1007/BF00993250
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DOI: https://doi.org/10.1007/BF00993250