Background: Congenital afibrinogenemia is characterized by the absence of fibrinogen, a hexamer composed of two copies of three polypeptides, Aalpha. Bbeta and gamma. The disease is caused by mutations in one of the three fibrinogen-encoding genes, FGA, FGB and FGG. Among these, several mutations have been reported to specifically impair fibrinogen secretion. We previously showed that secretion-defective fibrinogen mutants are retained in a pre-Golgi compartment and demonstrated the importance of the homologous betaC and gammaC domains in secretion. Here our aim was to restore the secretion of these mutants and study the properties of the rescued mutant molecules.
Design and methods: COS-7 cells were transfected and incubated with chemical chaperones or at low temperature. Clotting assays and plasmin digestion studies were performed to characterize secreted fibrinogen molecules.
Results: The secretion defect of two missense mutants but not that of late-truncating mutants could be partially corrected by incubating cells at 27 degrees C. By contrast, exposure of cells to chemical chaperones i.e. 4-phenylbutyrate, dimethyl sulfoxide or trimethylamine N-oxide had no effect. The mutants rescued at 27 degrees C were incorporated into fibrin clots and formed factor XIII-mediated gamma-gamma dimers in contrast to the dysfibrinogenemia Vlissingen/Frankfurt IV mutant, a negative control for these assays. However, plasmin digestion analyses revealed aberrant patterns for the mutants compared to normal fibrinogen.
Conclusions: Low temperature can restore the secretion of a subset of mutant fibrinogen molecules demonstrating that therapeutic manipulation of the quality control pathway is feasible for afibrinogenemia even though functional assays suggested a non-native conformation for the mutant molecules analyzed.