Transient desialylation in combination with a novel antithrombin deficiency causing a severe and recurrent thrombosis despite anticoagulation therapy.

Abstract

An in-depth focused study of specific cases of patients with recurrent thrombosis may help to identify novel circumstances, genetic and acquired factors contributing to the development of this disorder. The aim of this study was to carry out a detailed and sequential analysis of samples from a patient suffering from early and recurrent venous and arterial thrombosis. We performed thrombophilic tests, biochemical, functional, genetic and glycomic analysis of antithrombin and other plasma proteins. The patient carried a new type I antithrombin mutation (p.Ile218del), whose structural relevance was verified in a recombinant model. Experiments with N-glycosidase F and neuraminidase suggested a nearly full desialylation of plasma proteins, which was confirmed by mass spectrometry analysis of transferrin glycoforms. However, partial desialylation and normal patterns were detected in samples collected at other time-points. Desialylation was noticeable after arterial events and was associated with low antithrombin activity, reduced platelet count and glomerular filtration rate. This is the first description of a global and transient desialylation of plasma proteins associated with thrombosis. The decrease in the strong electronegative charge of terminal glycans may modulate hemostatic protein-protein interactions, which in combination with a strong prothrombotic situation, such as antithrombin deficiency, could increase the risk of thrombosis.

• Authors: Nuria Revilla, María Eugenia de la Morena-Barrio, Antonia Miñano, Raquel López-Gálvez, Mara Toderici, José Padilla, Ángel García-Avello, María Luisa Lozano, Dirk J Lefeber, Javier Corral, Vicente Vicente
• Journal: Scientific reports (Sci Rep) Vol. 7 Pg. 44556 (03 17 2017) ISSN: 2045-2322 [Electronic] England
• PMID: 28303970 (Publication Type: Case Reports, Journal Article, Research Support, Non-U.S. Gov't)

Chemical References

• Anticoagulants
• Fibrin
• Peptide-N4-(N-acetyl-beta-glucosaminyl) Asparagine Amidase

Topics

• Adult
• Anticoagulants (adverse effects, therapeutic use)
• Blood Coagulation Tests
• Female
• Fibrin (deficiency, genetics)
• Humans
• Mutation
• Pedigree
• Peptide-N4-(N-acetyl-beta-glucosaminyl) Asparagine Amidase (metabolism)
• Thrombolytic Therapy (adverse effects)
• Thrombophilia (blood, genetics, pathology)
• Thrombosis (blood, drug therapy, genetics)