The effect of chronic propranolol treatment on salivary composition and caries in the rat.
Many drugs are known to affect salivary secretion. The purpose of this study was to explore the chronic effects of a commonly used beta-adrenergic blocker, propranolol. Adult rats were desalivated or treated for 28 days with propranolol HCl (10 or 20 mg/kg, daily) or sterile buffer (sham-operated control) using osmotic pumps for delivery. The parotid and submandibular glands of each rat were cannulated and secretion elicited by pilocarpine (10 mg/kg, intravenous). There were no statistical differences in salivary protein content (Lowry) or output among the groups (ANOVA, p greater than 0.05). Analysis of salivary proteins by SDS-PAGE revealed a constant profile for submandibular secretions, but peak A and SP-3 proline-rich proteins were not detectable in parotid saliva of animals treated with propranolol for the entire experiment. Significantly increased smooth-surface (p = 0.0003) and sulcal (p = 0.0011) caries scores were found within these propranolol groups (ANOVA). The findings provide further evidence that chronic administration of propranolol alters salivary composition by decreasing proline-rich proteins and concurrently enhances susceptibility to caries.
Watson
G E
GE
Department of Dental Research, University of Rochester, NY 14642.
Pearson
S K
SK
Falany
J L
JL
Tabak
L A
LA
Bowen
W H
WH
D000704:Analysis of Variance; D000818:Animals; D003731:Dental Caries / Q000209:etiology*; D003733:Dental Caries Susceptibility / Q000187:drug effects; D005260:Female; D007260:Infusion Pumps; D010862:Pilocarpine / Q000494:pharmacology; D011433:Propranolol / Q000008:administration & dosage / Q000097:blood / Q000494:pharmacology*; D051381:Rats; D011919:Rats, Inbred Strains; D012044:Regression Analysis; D012463:Saliva / Q000032:analysis / Q000187:drug effects* / Q000378:metabolism; D012471:Salivary Proteins and Peptides / Q000032:analysis
D012471:Salivary Proteins and Peptides; D010862:Pilocarpine; D011433:Propranolol