Abstract
The air pouch has been shown to provide a convenient model for studying the behaviour of synovial lining tissue. Air pouches of different ages were used to study the reactivity of newly developing lining tissue towards irritants known to cause inflammation. Pouches of 1 day in age were relatively inert in their reactivity as judged by the number of cells and volume of the exudate accumulating in the pouch. In contrast, 3-day-old pouches responded to a much greater extent, and 6-day-old pouches were highly responsive with a further increase in cell numbers and fluid volume. The different responses of 1-, 3- and 6-day-old pouches could be explained by (a) developing vascularity of the pouch, (b) formation of an organised lining of phagocytic cells, or (c) an increasingly organised mechanical barrier that retains the irritant and products of the inflammatory response. These studies of air pouch lining development permit a dissection of those components necessary for inflammatory reactivity of a lining tissue and may help explain the sensitivity of synovium to chronic inflammation.
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