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Original Article

Messages and handshakes: Cellular interactions in pulmonary fibrosis

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Pages 18-26 | Accepted 21 Jun 1994, Published online: 06 Jul 2009
 

Summary

A better understanding of early cellular events following pulmonary injury may permit the identification of those patterns of response which are destined to progress to fibrosis. Interactions between inflammatory, fibroblastic and epithelial cells appear to play crucial roles in fibrogenesis. Intercellular communication may be via “messages” delivered by soluble mediators or “handshakes” at sites of cell-to-cell contact. In this review, we question the validity of some prevailing concepts about the importance of growth factor secretion by alveolar macrophages; examine the possible role of activated T-lymphocytes in regulating macrophage production of mediators; and hypothesise that whereas fibroblast proliferation may primarily be stimulated by macrophage-derived cytokines, accumulation of collagen may be regulated by growth factors expressed by injured alveolar epithelial cells.

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