Abstract:
:To assess whether TNF-alpha causes inflammatory demyelination or axonal degeneration, we injected into rat sciatic nerve saline, 100 U and 1000 U of rhTNF-alpha and studied the electrophysiological and pathological effects. At day 1 electrophysiology showed a slight reduction of proximal compound muscle action potential amplitude and pathology showed edema, inflammatory infiltration of vessel walls and endoneurium only in nerves injected with 1000 U of rhTNF-alpha. At day 5, there was no demyelination and a percentage of degenerated fibers similar in the three groups. To study the blood-nerve barrier, fluorescein isothiocyanate-labelled albumin was given intravenously after intraneural injection. The nerves injected with 1000 U rhTNF-alpha showed a leakage of the tracer in the endoneurium. TNF-alpha does not appear, at the doses used, to have myelinotoxic or axonopathic properties. The electrophysiological effect at day 1 may be due to mechanical compression of nerve fibers as a result of the blood-nerve barrier damage with consequent endoneurial edema.
journal_name
J Neuroimmunoljournal_title
Journal of neuroimmunologyauthors
Uncini A,Di Muzio A,Di Guglielmo G,De Angelis MV,De Luca G,Lugaresi A,Gambi Ddoi
10.1016/s0165-5728(98)00229-xsubject
Has Abstractpub_date
1999-02-01 00:00:00pages
88-94issue
1-2eissn
0165-5728issn
1872-8421pii
S0165-5728(98)00229-Xjournal_volume
94pub_type
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