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. 1987 Dec;84(24):9304-8.
doi: 10.1073/pnas.84.24.9304.

Human neutrophil elastase releases cell surface mucins from primary cultures of hamster tracheal epithelial cells

K C Kim  1 , K Wasano, R M Niles, J E Schuster, P J Stone, J S Brody
Affiliations

Human neutrophil elastase releases cell surface mucins from primary cultures of hamster tracheal epithelial cells

K C Kim et al. Proc Natl Acad Sci U S A. 1987 Dec.

Abstract

Primary hamster tracheal epithelial cells growing on a collagen gel matrix produce high molecular weight mucins indistinguishable from mucins produced in vivo. Using a modified version of these confluent cultures, we have demonstrated here that (i) release of mucins can be stimulated by human neutrophil elastase (HNE; EC 3.4.21.37); (ii) HNE can degrade mucins, and both mucin release and degradation by HNE require an active catalytic site; and (iii) there are at least two pools of mucins in these cells: one is a rapidly turning-over spontaneously releasable constitutive pool, the other is a slowly turning-over HNE-releasable pool. We provide evidence that the HNE-releasable mucins are membrane bound and associated with the secretory cell apical surface.

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