Biosynthesis of human ficolin, an Escherichia coli-binding protein, by monocytes: comparison with the synthesis of two macrophage-specific proteins, C1q and the mannose receptor

Immunology
J LuS H Lee

Abstract

Ficolin is characterized by the presence of both collagen-like and fibrinogen-like sequences, and potentially has a similar overall structure as the complement protein C1q and the collectins. Previous studies have reported the presence of human ficolin mRNA predominantly in peripheral blood leucocytes. In the present study, the cellular origin of human ficolin was investigated in further detail. Preliminary studies using reverse transcriptase-polymerase chain reaction (RT-PCR) showed that ficolin mRNA was synthesized by U937 cells, a human monocyte cell line. This finding suggested that blood monocytes also normally synthesize human ficolin. Peripheral blood monocytes from adult human donors were harvested at serial time-points (0-20 hr) after adhesion to tissue culture plates, and total RNA was isolated and assayed for ficolin mRNA by RT-PCR. Ficolin mRNA was highly expressed in monocytes throughout the first 20 hr of adhesion. In contrast, C1q and mannose receptor mRNA were not detectable during the first 8 hr of adhesion, but were highly expressed by 20 hr. Cells were harvested at longer time intervals (1, 2, 4, 6 and 8 days) to determine whether ficolin expression was temporally regulated at later stages of monocyte differe...Continue Reading

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