Levels of interleukin 1β in tissue from sites of active periodontal disease

Abstract

Interleukin 1 beta is a potent bone resorptive cytokine which also mediates soft tissue destruction through the stimulation of prostaglandin production, and the induction of collagenase and other proteases. This constellation of activities suggests a role for IL-1 beta in the pathogenesis of human periodontitis. Levels of IL-1 beta were therefore determined in tissue obtained from (1) diseased, active (2) diseased, inactive and (3) healthy sites from 12 patients with destructive adult periodontitis. Disease activity was defined as attachment loss of greater than or equal to 2.5 mm, as determined by sequential probing and the tolerance method. IL-1 beta was extracted from homogenates of tissue biopsies taken at surgery, and levels were quantified by ELISA. IL-1 beta was found to be present in most patient tissue samples, with levels ranging from 0-82 ng/ml. Disease active sites had higher IL-1 beta levels (p less than 0.05) than inactive and healthy sites. Diseased inactive sites were divided into 2 groups, those losing small amounts of attachment (0.5-2.0 mm, worsening sites) and those which showed no change or attachment gain (stable sites). Stable diseased sites had IL-1 beta levels which were comparable to those found in healthy sites, and which were significantly different from active sites (p less than 0.02). Worsening sites had IL-1 beta levels intermediate between the levels in stable and active sites. Detection of disease activity occurred more frequently at sites with IL-1 beta levels greater than 25 ng/ml (p less than 0.01).(ABSTRACT TRUNCATED AT 250 WORDS)