Universität zu Köln

Barham, Mohammed, Streppel, Michael, Guntinas-Lichius, Orlando, Fulgham-Scott, Nicole, Vogt, Johannes and Neiss, Wolfram F. (2022). Treatment With Nimodipine or FK506 After Facial Nerve Repair Neither Improves Accuracy of Reinnervation Nor Recovery of Mimetic Function in Rats. Front. Neurosci., 16. LAUSANNE: FRONTIERS MEDIA SA. ISSN 1662-453X

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Abstract

PurposeNimodipine and FK506 (Tacrolimus) are drugs that have been reported to accelerate peripheral nerve regeneration. We therefore tested these substances aiming to improve the final functional outcome of motoric reinnervation after facial nerve injury. MethodsIn 18 female rats, the transected facial nerve was repaired by an artificial nerve conduit. The rats were then treated with either placebo, nimodipine, or FK506, for 56 days. Facial motoneurons were pre-operatively double-labeled by Fluoro-Gold and again 56 days post-operation by Fast-Blue to measure the cytological accuracy of reinnervation. The whisking motion of the vibrissae was analyzed to assess the quality of functional recovery. ResultsOn the non-operated side, 93-97% of those facial nerve motoneurons innervating the vibrissae were double-labeled. On the operated side, double-labeling only amounted to 38% (placebo), 40% (nimodipine), and 39% (FK506), indicating severe misdirection of reinnervation. Regardless of post-operative drug or placebo therapy, the whisking frequency reached 83-100% of the normal value (6.0 Hz), but whisking amplitude was reduced to 33-48% while whisking velocity reached 39-66% of the normal values. Compared to placebo, statistically neither nimodipine nor FK506 improved accuracy of reinnervation and function recovery. ConclusionDespite previous, positive data on the speed and quantity of axonal regeneration, nimodipine and FK506 do not improve the final functional outcome of motoric reinnervation in rats.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Barham, Mohammed UNSPECIFIED UNSPECIFIED UNSPECIFIED Streppel, Michael UNSPECIFIED UNSPECIFIED UNSPECIFIED Guntinas-Lichius, Orlando UNSPECIFIED UNSPECIFIED UNSPECIFIED Fulgham-Scott, Nicole UNSPECIFIED UNSPECIFIED UNSPECIFIED Vogt, Johannes UNSPECIFIED UNSPECIFIED UNSPECIFIED Neiss, Wolfram F. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-668845
DOI:	10.3389/fnins.2022.895076
Journal or Publication Title:	Front. Neurosci.
Volume:	16
Date:	2022
Publisher:	FRONTIERS MEDIA SA
Place of Publication:	LAUSANNE
ISSN:	1662-453X
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language RECURRENT LARYNGEAL NERVE; PERIPHERAL-NERVE; AXONAL REGENERATION; MANUAL STIMULATION; WHISKER-PAD; MOTOR; MUSCLE; INJURY; ANASTOMOSIS; PROMOTES Multiple languages Neurosciences Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/66884