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- W2111181526 abstract "Diabetic polyneuropathy can lead to atrophy and weakness of distally located striated muscles due to denervation. Lack of neurotrophic support is believed to contribute to the development of diabetic neuropathy. In this study, we measured the expression of nerve growth factor (NGF), brain-derived neurotrophic factor (BDNF), neurotrophin 3 (NT-3), neurotrophin 4 (NT-4) and ciliary neurotrophic factor (CNTF) in muscle biopsies taken from the gastrocnemic and deltoid muscles in 42 diabetic patients and 20 healthy control subjects. To express the distal neuropathic gradient and to reduce interindividual variation, a distal/proximal ratio between expression levels in the gastrocnemic and deltoid muscles was calculated for all neurotrophic factors. Neuropathic status was determined by clinical examination, electrophysiological studies and quantitative sensory examination in diabetic patients, and muscle strength at both the shoulder and ankle was assessed by isokinetic dynamometry. Distal/proximal ratios for NT-3 were lower in diabetic patients [median (range) 110.7 (39.8–546.8)] than in controls [157.6 (63.3–385.4); (P < 0.05)], and in neuropathic diabetic patients [107.1 (39.8–326.0)] versus patients without neuropathy [134.5 (46.6–546.8); (P < 0.005)]. Further, ratios for NT-3 were related to muscle strength (rs = 0.41, P < 0.01) and showed a tendency towards a negative relationship to the combined score of all measures of neuropathy [Neuropathy rank-sum score (NRSS)] (rs = −0.27, P = 0.09). Similar trends were observed for ratios for NT-4. Ratios for NGF (rs = −0.32, P < 0.05) and BDNF (rs = −0.32, P < 0.05) were related to NRSS, but not to muscle strength. Ratios for CNTF were higher in diabetic patients [64.6 (23.7–258.7)] compared with controls [50.2 (27.2–186.4); (P < 0.05)], but showed no relationship to neither NRSS nor muscle strength. Our results show that the expression of NT-3 is reduced in striated muscles in diabetic patients and is related to muscle weakness and neuropathy. We suggest that lack of NT-3 contributes to insufficient re-innervation leading to the loss of muscle strength in diabetic neuropathy." @default.
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- W2111181526 date "2009-08-20" @default.
- W2111181526 modified "2023-10-18" @default.
- W2111181526 title "Expression of neurotrophic factors in diabetic muscle--relation to neuropathy and muscle strength" @default.
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- W2111181526 doi "https://doi.org/10.1093/brain/awp208" @default.
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