{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,11]],"date-time":"2026-03-11T22:44:44Z","timestamp":1773269084194,"version":"3.50.1"},"reference-count":44,"publisher":"Wiley","issue":"4","license":[{"start":{"date-parts":[[2001,3,20]],"date-time":"2001-03-20T00:00:00Z","timestamp":985046400000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Muscle and Nerve"],"published-print":{"date-parts":[[2001,4]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>Brain\u2010derived neurotrophic factor (BDNF) is neuroprotective for motoneurons undergoing degeneration, including those in natural motor neuron disease (MND) in wobbler mice. To assess the role of BDNF in this model of MND, endogenous BDNF immunoreactivity was analyzed by semiquantitative video\u2010image analysis. Affected cervical spinal cord motoneurons had significantly greater BDNF immunoreactivity compared to motoneurons of healthy littermates (<jats:italic>P<\/jats:italic> = 0.01) and affected lumbar spinal cord motoneurons (<jats:italic>P<\/jats:italic> = 0.008 at age 4 weeks; <jats:italic>P<\/jats:italic> = 0.005 at age 8 weeks). Neuronal nitric oxide synthase (n\u2010NOS) immunocytochemistry revealed increased immunoreactivity in the affected cervical spinal cord motoneurons. Exogenous BDNF treatment partially inhibited the increased NOS activity, as quantitatively measured by nicotinamide adenine dinucleotide phosphate diaphorase (NADPH\u2010d) histochemistry. The mean number of NADPH\u2010d<jats:sup>+<\/jats:sup> motoneurons in the cervical anterior horn decreased from 3.5 \u00b1 1.2 to 1.5 \u00b1 1.2 (<jats:italic>P<\/jats:italic> = 0.002). The increase in endogenous BDNF immunoreactivity in the affected spinal cord may be compensatory in diseased motoneurons, yet it appears to still be inadequate because exogenous BDNF treatment is required to suppress increased NOS activity in degenerating motoneurons. Our study indicates that BDNF is important in halting nitric oxide (NO)\u2010mediated motor neuron degeneration, which has potential implications for the treatment of neurodegenerative disorders. \u00a9 2001 John Wiley &amp; Sons, Inc. 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