Abstract：
AIMS/HYPOTHESIS:Neuronal dorsal root ganglion (DRG) cells seem to be vulnerable in diabetes. The aim of this study was to determine whether the p75 neurotrophin receptor stimulates perikaryal shrinkage and neuronal death, and further accelerates neuronal DRG cell loss after axotomy in a mouse model of diabetes. METHODS:Nine non-diabetic BALB/c p75(+/+) mice, seven diabetic BALB/c p75(+/+) mice, nine non-diabetic p75(-/-) mice and nine diabetic p75(-/-) mice received a unilateral sciatic nerve crush 1 to 2 days after streptozotocin treatment. Tissues were fixed 28 days later by vascular perfusion, and the volume and number of the fifth lumbar DRG neurons were obtained using assumption-free stereological techniques. RESULTS:In diabetic p75(+/+) mice there was a 9% reduction in the perikaryal volume of the DRG A cells ( p<0.05) and a 10% reduction in the perikaryal volume of the DRG B cells ( p<0.05) on the non-crushed side compared with in non-diabetic p75(+/+) mice. However, neuronal cell number was not reduced. Conversely, no perikaryal shrinkage of A cells or B cells occurred on the non-crushed side in diabetic p75(-/-) mice, and no neuronal cell loss was observed. Following nerve crush, there was a loss of B cells in non-diabetic p75(+/+) mice (37+/-6%) and in diabetic p75(+/+) mice (36+/-4%). In non-diabetic p75(-/-) mice, no neuronal cell loss occurred after crush, whereas in diabetic p75(-/-) mice the loss of B cells (14+/-4%) was small but significant ( p<0.02). CONCLUSIONS/INTERPRETATION:In experimental diabetes the p75 neurotrophin receptor is involved in neuronal DRG cell body shrinkage without loss of neuronal DRG cells. Following sciatic nerve crush, DRG cell loss is not accelerated in diabetic p75(+/+) mice.
journal_name
Diabetologiajournal_title
Diabetologiaauthors
Jiang Y,Jakobsen Jdoi
10.1007/s00125-004-1504-6subject
Has Abstractpub_date
2004-09-01 00:00:00pages
1502-10issue
9eissn
0012-186Xissn
1432-0428journal_volume
47pub_type
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