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- W2024228411 abstract "Recombinant human nerve growth factor (rhNGF) was delivered for up to 6 months by continuous intracerebroventricular (i.c.v.) infusion to CD (Sprague-Dawley derived) rats and cynomolgus monkeys. Rats (n = 15/sex/group) received doses of 0 (vehicle), 6, 60, or 300 ng/day; monkeys (n = 5/sex/group) received 0, 0.6, 6, or 60 microg/day of rhNGF. Animals tolerated i.c.v. infusion with no behavioral signs attributable to rhNGF. Body weight was transiently decreased in female rats at the highest dose. At the completion of dosing, histological examination in both species revealed an increase in the thickness of the leptomeninges along the ventral and lateral surfaces of the hindbrain and extending over the dorsal aspect of the spinal cord. The change was present to varying degrees at all doses of rhNGF and tended to be more severe at higher doses. At the light microscopic level, the leptomeninges contained layers of well-differentiated, spindle-shaped cells and a plexus of axonal fibers. Cells were immunoreactive for S-100 protein and were associated with an accumulation of Type IV collagen, suggesting Schwann cell origin. Electron microscopy revealed numerous fine caliber axons ensheathed by the presumptive Schwann cells, with myelination of individual axonal segments. These findings suggest that chronic i.c.v. delivery of rhNGF has stimulated axonal sprouting and secondary hyperplasia of Schwann or Schwann-like support cells within the pia-arachnoid." @default.
- W2024228411 created "2016-06-24" @default.
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- W2024228411 date "1997-05-01" @default.
- W2024228411 modified "2023-09-27" @default.
- W2024228411 title "Hyperplastic Changes within the Leptomeninges of the Rat and Monkey in Response to Chronic Intracerebroventricular Infusion of Nerve Growth Factor" @default.
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- W2024228411 doi "https://doi.org/10.1006/exnr.1997.6448" @default.
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