title: The effect of local injection of botulinum toxin A on the parotid gland of the rat: an immunohistochemical and morphometric study.
abstract: OBJECTIVE
  In this investigation, the effect of a local injection of botulinum toxin A on the concentration of acetylcholinesterase in the parotid gland of the rat was examined.
  
  
  METHODS
  After local injection into the parotid glands of female Wistar rats, the treated glands were excised, and immunohistochemical staining for acetylcholinesterase was performed. To discover possible changes in cell morphology after local application of botulinum toxin A, morphometric measurements also were performed on the excised parotid glands.
  
  
  RESULTS
  In contrast to the untreated, physiologic saline-injected, glands, there was a decrease in the concentration of acetylcholinesterase in the glands treated with botulinum toxin. No persistent changes in the number of acinar cells could be observed.
  
  
  CONCLUSIONS
  Because the cholinergic pathway of the autonomic nervous system has great importance in the secretion of fluid from the salivary glands, blocking this pathway and local application of botulinum toxin offers a possible therapeutic option for the treatment of hypersalivation in various otolaryngologic and neurologic diseases.
authors.affiliation: Department of Otorhinolaryngology, University of Göttingen, Germany. ellies@web.de
authors.forename: M
authors.initials: M
authors.lastname: Ellies
authors.forename: R
authors.initials: R
authors.lastname: Laskawi
authors.forename: G
authors.initials: G
authors.lastname: Tormählen
authors.forename: W
authors.initials: W
authors.lastname: Götz
mesh_terms: D000110:Acetylcholinesterase / Q000032:analysis; D000818:Animals; D001905:Botulinum Toxins / Q000494:pharmacology*; D002800:Cholinesterase Inhibitors / Q000494:pharmacology*; D005260:Female; D007124:Immunoenzyme Techniques; D010306:Parotid Gland / Q000187:drug effects* / Q000201:enzymology*; D051381:Rats; D017208:Rats, Wistar; D012472:Salivation / Q000187:drug effects*
chemical_list: D002800:Cholinesterase Inhibitors; D000110:Acetylcholinesterase; D001905:Botulinum Toxins