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The Effects of Various Secretagogues on the Mucin Content of Pure Submandibular Salivas
P.C. Denny
Department of Basic Sciences, School of Dentistry, University of Southern California, Los Angeles, California 90089-0641
P.A. Denny
Department of Basic Sciences, School of Dentistry, University of Southern California, Los Angeles, California 90089-0641
M.S. Yim
Department of Basic Sciences, School of Dentistry, University of Southern California, Los Angeles, California 90089-0641
The concentrations of a specific mucin and total protein were compared in pure submandibular saliva samples elicited by pilocarpine (PILO), epinephrine (EPI), and isoproterenol (IPR) in mice. At the dosages employed, IPR-stimulated samples contained, on the average, the highest concentrations of protein and mucin. EPI samples contained intermediate levels, and PILO the lowest concentrations. The average mucin-to-protein ratio in the PILO saliva samples was intermediate between the IPR and EPI samples. Non-stimulated saliva samples showed a broader range of mucin to total protein than did the stimulated saliva sets. Within the PILO saliva samples, there was a very strong positive correlation between the mucin content of saliva and the mucin content in the pre-secretory gland prior to stimulation. The mucin content of EPI and IPR samples also showed strong positive relationships with the content of mucin in the gland. The mucin and protein in EPI saliva samples were significantly correlated in at least one of the collections, whereas in the IPR samples, there was a much weaker relationship. With the exception of the third sequential collection of EPI saliva, all nine of the other EPI, IPR, and PILO collection sets showed only a weakly negative or no correlation between flow rate and saliva mucin or protein content. This is in sharp contrast with the strongly negative correlalion which was noted between saliva protein or mucin contents and flow rate when all of the data were combined. These observations suggest that the nature of the stimulant is a very important determinant of overall flow rates, saliva protein, and mucin concentrations. However, at the individual level, factors which control each are often not strongly coordinated.
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Journal of Dental Research, Vol. 66, No. 5,
1011-1015 (1987)
DOI: 10.1177/00220345870660050301
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