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Brain-derived neurotrophic factor promotes axonal regeneration and long-term survival of adult rat spinal motoneurons in vivo.

Abstract：

:This study shows that in adult rat spinal motoneurons brain-derived neurotrophic factor exerts a neuroprotective effect which extends several weeks beyond the duration of treatment. In addition, brain-derived neurotrophic factor strongly enhances regeneration of avulsed motor axons across the border between the central and peripheral nervous systems. Treatment with brain-derived neurotrophic factor is known to rescue adult rat spinal motoneurons from retrograde cell death induced by ventral root avulsion. The present experiments were designed to test whether this survival effect remains over an extended period of time following cessation of treatment and, also, whether brain-derived neurotrophic factor promotes regeneration of avulsed motor axons. After avulsion of a spinal ventral root, four weeks of treatment with brain-derived neurotrophic factor (10 microg/day) or vehicle was initiated. By using different retrograde tracers to obtain pre- and postoperative labelling of avulsed and regenerating motoneurons, respectively, the number of surviving motoneurons as well as the extent of motor axonal regeneration could be analysed. The expression of nitric oxide synthase in the lesioned motoneurons was also studied. In the vehicle-treated rats, only 10% of the avulsed motoneurons remained at 12 weeks postoperatively, 20-40% of which displayed nitric oxide synthase activity. Treatment with brain-derived neurotrophic factor during the initial four postoperative weeks resulted in 45% motoneuron survival and a complete blockage of nitric oxide synthase expression at 12 weeks postoperatively. Brain-derived neurotrophic factor also induced abundant regeneration of the avulsed motor axons, which formed extensive fibre bundles along the surface of the spinal cord and adjacent ventral roots. The long-term effect by brain-derived neurotrophic factor seemed to be even stronger on motor axonal regeneration than on motoneuron survival. The present results indicate a therapeutic potential for brain-derived neurotrophic factor in the early treatment of traumatic injuries to spinal nerves and roots.

journal_name

Neuroscience

journal_title

Neuroscience

authors

Novikov L,Novikova L,Kellerth JO

doi

10.1016/s0306-4522(96)00665-3

subject

Has Abstract

pub_date

1997-08-01 00:00:00

pages

765-74

issue

3

eissn

0306-4522

issn

1873-7544

pii

S0306-4522(96)00665-3

journal_volume

79

pub_type

杂志文章

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