Publication Date:
2014-11-27
Description:
Background: Surfactant proteins (SP) secreted by alveolar type 2 cells, play an essential role in maintaining the air-liquid barrier of the lung and are also involved in the opsonisation and clearance of bacteria by phagocytes. We have recently described a novel surfactant protein, SP-H (SFTA3). Expression of SP-H was earlier demonstrated to be upregulated by LPS and negatively regulated by IL-1beta and IL-23 in vitro. Methods: The influence of SP-H on phagocytosis was measured using a murine and a human phagocytic cell line and fluorescent latex beads. Results: SP-H markedly increases phagocytosis in vitro in the murine-derived alveolar macrophage cell lines MH-S and in human-derived differentiated U937 cells. Conclusion: It can be assumed that SP-H is involved in regulating phagocytic activity of macrophages. SP-H is a new player in pulmonary host defence.
Electronic ISSN:
1756-0500
Topics:
Biology
,
Medicine
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