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J Dent Res 36(2): 223-229, 1957
© 1957 International and American Associations for Dental Research
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A COMPARISON OF SALIVARY PROTEASE ACTIVITY IN THE HUNT-HOPPERT CARIES-RESISTANT AND CARIES-SUSCEPTIBLE RATS

N. P. WILLETT 1, S. ROSEN 1, H. J. STAFSETH 1, H. R. HUNT 1, and C. A. HOPPERT 1

1 Departments of Microbiology and Public Health, Zoology, and Chemistry, Michigan State University, East Lansing, Mich.

A study was made to compare the protease activities of the saliva of the Hunt-Hoppert caries-resistant and caries-susceptible rats.

In mature animals, the saliva of susceptible males displayed from 2.6 to 3.2 times as much protease activity as that of resistant males. Mature susceptible females showed 2.1 to 2.6 times the activity of resistant females.

Susceptible males exhibited slightly greater activity than susceptible females in rats 88 to 125 days old. However, these differences were not observed in rats prior to puberty or in rats older than 125 days.

Activity increased sharply with age in the case of susceptible animals, whereas much smaller changes were found in resistants of comparable ages. The possible relationship of protease activity to caries was discussed.

Submitted on October 20, 1955






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