Muscle fiber-type changes induced by botulinum toxin injection in the rat larynx.
This study examined muscle fiber-type alterations after single or multiple botulinum toxin (BT) injections to better understand possible morphologic changes induced by therapeutic BT injections in patients with spasmodic dysphonia. Muscle fiber staining was accomplished in rat intrinsic laryngeal muscles with antibodies to specific myosin heavy chains. Results indicated that the typical baseline distributions of type II muscle fibers (ie, types IIa, IIb, IIx, and IIL) were altered by BT injection, while no change was observed in type I fibers. Embryonic fibers were observed only along the needle insertion site at 7 days post BT injection. Although inferences from these animal data to human neuromuscular function must be made with caution, our findings provide insight into the possible cellular and molecular changes characterizing BT-injected muscles.
Inagi
K
K
Division of Otolaryngology-Head and Neck Surgery, Department of Surgery, University of Wisconsin Medical School, Madison, WI, USA.
Connor
N P
NP
Schultz
E
E
Ford
C N
CN
Cook
C H
CH
Heisey
D M
DM
D000818:Animals; D001905:Botulinum Toxins / Q000008:administration & dosage / Q000494:pharmacology*; D007150:Immunohistochemistry; D007267:Injections; D007821:Laryngeal Muscles / Q000033:anatomy & histology / Q000187:drug effects*; D008297:Male; D018485:Muscle Fibers, Skeletal / Q000187:drug effects*; D051381:Rats; D017207:Rats, Sprague-Dawley
D001905:Botulinum Toxins