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. 1989 Nov;86(22):8788–8792. doi: 10.1073/pnas.86.22.8788

Stimulation of fibrinogen synthesis in cultured rat hepatocytes by fibrinogen degradation product fragment D.

F M LaDuca 1, L A Tinsley 1, C V Dang 1, W R Bell 1
PMCID: PMC298375  PMID: 2813424

Abstract

The direct stimulation of fibrinogen biosynthesis by fibrinogen degradation produces (FDPs) was studied in rat hepatocyte cultures. Pure rat FDP fragment D (FDP-D) (Mr 90,000) and FDP fragment E (FDP-E) (Mr 40,000) and mixtures of the two (FDP-DE) were added to rat hepatocytes cultured in serum-free hormonally defined medium. Hydrocortisone (20 microM) significantly increased synthesis of fibrinogen, as determined by incorporation of [35S]methionine. FDP-D and FDP-E did not increase fibrinogen synthesis in the presence of hydrocortisone. However, hepatocytes cultured without hydrocortisone displayed increased fibrinogen synthesis (2.0- to 2.8-fold) with FDP-D (2.6-6.7 microM) but not with FDP-E (5.7 microM). At these FDP concentrations the synthesis of albumin, haptoglobin, and transferrin was not increased. FDP-D-induced fibrinogen synthesis was inhibited (greater than 90%) by actinomycin D and cycloheximide, indicating that the increase in [35S]methionine incorporation was from de novo protein synthesis. The role of FDP-D was further substantiated by showing that FDP-D, but not FDP-E, bound to the hepatocytes. These data indicate that FDP-D, but not FDP-E, directly and specifically stimulates fibrinogen synthesis in rat hepatocytes; this stimulation does not require any additional serum or protein cofactors.

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Selected References

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