| Structural highlights
Disease
[FA11_HUMAN] Defects in F11 are the cause of factor XI deficiency (FA11D) [MIM:612416]; also known as plasma thromboplastin antecedent deficiency or Rosenthal syndrome. It is a hemorrhagic disease characterized by reduced levels and activity of factor XI resulting in moderate bleeding symptoms, usually occurring after trauma or surgery. Patients usually do not present spontaneous bleeding but women can present with menorrhagia. Hemorrhages are usually moderate.[1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16] [17] [18] [19] [20]
Function
[FA11_HUMAN] Factor XI triggers the middle phase of the intrinsic pathway of blood coagulation by activating factor IX.
Publication Abstract from PubMed
A large unmet medical need exists for safer antithrombotic drugs because all currently approved anticoagulant agents interfere with hemostasis, leading to an increased risk of bleeding. Genetic and pharmacologic evidence in humans and animals suggests that reducing factor XI (FXI) levels has the potential to effectively prevent and treat thrombosis with a minimal risk of bleeding. We generated a fully human antibody (MAA868) that binds the catalytic domain of both FXI (zymogen) and activated FXI. Our structural studies show that MAA868 traps FXI and activated FXI in an inactive, zymogen-like conformation, explaining its equally high binding affinity for both forms of the enzyme. This binding mode allows the enzyme to be neutralized before entering the coagulation process, revealing a particularly attractive anticoagulant profile of the antibody. MAA868 exhibited favorable anticoagulant activity in mice with a dose-dependent protection from carotid occlusion in a ferric chloride-induced thrombosis model. MAA868 also caused robust and sustained anticoagulant activity in cynomolgus monkeys as assessed by activated partial thromboplastin time without any evidence of bleeding. Based on these preclinical findings, we conducted a first-in-human study in healthy subjects and showed that single subcutaneous doses of MAA868 were safe and well tolerated. MAA868 resulted in dose- and time-dependent robust and sustained prolongation of activated partial thromboplastin time and FXI suppression for up to 4 weeks or longer, supporting further clinical investigation as a potential once-monthly subcutaneous anticoagulant therapy.
MAA868, a novel FXI antibody with a unique binding mode, shows durable effects on markers of anticoagulation in humans.,Koch AW, Schiering N, Melkko S, Ewert S, Salter J, Zhang Y, McCormack P, Yu J, Huang X, Chiu YH, Chen Z, Schleeger S, Horny G, DiPetrillo K, Muller L, Hein A, Villard F, Scharenberg M, Ramage P, Hassiepen U, Cote S, DeGagne J, Krantz C, Eder J, Stoll B, Kulmatycki K, Feldman DL, Hoffmann P, Basson CT, Frost RJA, Khder Y Blood. 2019 Mar 28;133(13):1507-1516. doi: 10.1182/blood-2018-10-880849. Epub, 2019 Jan 28. PMID:30692123[21]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
References
- ↑ Asakai R, Chung DW, Ratnoff OD, Davie EW. Factor XI (plasma thromboplastin antecedent) deficiency in Ashkenazi Jews is a bleeding disorder that can result from three types of point mutations. Proc Natl Acad Sci U S A. 1989 Oct;86(20):7667-71. PMID:2813350
- ↑ Meijers JC, Davie EW, Chung DW. Expression of human blood coagulation factor XI: characterization of the defect in factor XI type III deficiency. Blood. 1992 Mar 15;79(6):1435-40. PMID:1547342
- ↑ Pugh RE, McVey JH, Tuddenham EG, Hancock JF. Six point mutations that cause factor XI deficiency. Blood. 1995 Mar 15;85(6):1509-16. PMID:7888672
- ↑ Imanaka Y, Lal K, Nishimura T, Bolton-Maggs PH, Tuddenham EG, McVey JH. Identification of two novel mutations in non-Jewish factor XI deficiency. Br J Haematol. 1995 Aug;90(4):916-20. PMID:7669672
- ↑ Wistinghausen B, Reischer A, Oddoux C, Ostrer H, Nardi M, Karpatkin M. Severe factor XI deficiency in an Arab family associated with a novel mutation in exon 11. Br J Haematol. 1997 Dec;99(3):575-7. PMID:9401068
- ↑ Martincic D, Zimmerman SA, Ware RE, Sun MF, Whitlock JA, Gailani D. Identification of mutations and polymorphisms in the factor XI genes of an African American family by dideoxyfingerprinting. Blood. 1998 Nov 1;92(9):3309-17. PMID:9787168
- ↑ Alhaq A, Mitchell M, Sethi M, Rahman S, Flynn G, Boulton P, Caeno G, Smith M, Savidge G. Identification of a novel mutation in a non-Jewish factor XI deficient kindred. Br J Haematol. 1999 Jan;104(1):44-9. PMID:10027710
- ↑ Mitchell M, Cutler J, Thompson S, Moore G, Jenkins Ap Rees E, Smith M, Savidge G, Alhaq A. Heterozygous factor XI deficiency associated with three novel mutations. Br J Haematol. 1999 Dec;107(4):763-5. PMID:10606881
- ↑ Zivelin A, Bauduer F, Ducout L, Peretz H, Rosenberg N, Yatuv R, Seligsohn U. Factor XI deficiency in French Basques is caused predominantly by an ancestral Cys38Arg mutation in the factor XI gene. Blood. 2002 Apr 1;99(7):2448-54. PMID:11895778
- ↑ Kravtsov DV, Wu W, Meijers JC, Sun MF, Blinder MA, Dang TP, Wang H, Gailani D. Dominant factor XI deficiency caused by mutations in the factor XI catalytic domain. Blood. 2004 Jul 1;104(1):128-34. Epub 2004 Mar 16. PMID:15026311 doi:10.1182/blood-2003-10-3530
- ↑ Dai L, Mitchell M, Carson P, Creagh D, Cutler J, Savidge G, Alhaq A. Severe factor XI deficiency caused by compound heterozygosity. Br J Haematol. 2004 Jun;125(6):817-8. PMID:15180874 doi:10.1111/j.1365-2141.2004.04979.x
- ↑ Hill M, McLeod F, Franks H, Gordon B, Dolan G. Genetic analysis in FXI deficiency: six novel mutations and the use of a polymerase chain reaction-based test to define a whole gene deletion. Br J Haematol. 2005 Jun;129(6):825-9. PMID:15953011 doi:10.1111/j.1365-2141.2005.05536.x
- ↑ Quelin F, Mathonnet F, Potentini-Esnault C, Trigui N, Peynet J, Bastenaire B, Guillon L, Bigel ML, Sauger A, Mazurier C, de Mazancourt P. Identification of five novel mutations in the factor XI gene (F11) of patients with factor XI deficiency. Blood Coagul Fibrinolysis. 2006 Jan;17(1):69-73. PMID:16607084 doi:10.1097/01.mbc.0000198054.50257.96
- ↑ Fard-Esfahani P, Lari GR, Ravanbod S, Mirkhani F, Allahyari M, Rassoulzadegan M, Ala F. Seven novel point mutations in the F11 gene in Iranian FXI-deficient patients. Haemophilia. 2008 Jan;14(1):91-5. Epub 2007 Nov 13. PMID:18005151 doi:10.1111/j.1365-2516.2007.01593.x
- ↑ Kim J, Song J, Lyu CJ, Kim YR, Oh SH, Choi YC, Yoo JH, Choi JR, Kim H, Lee KA. Population-specific spectrum of the F11 mutations in Koreans: evidence for a founder effect. Clin Genet. 2012 Aug;82(2):180-6. doi: 10.1111/j.1399-0004.2011.01732.x. Epub, 2011 Jun 30. PMID:21668437 doi:10.1111/j.1399-0004.2011.01732.x
- ↑ Dai L, Rangarajan S, Mitchell M. Three dominant-negative mutations in factor XI-deficient patients. Haemophilia. 2011 Sep;17(5):e919-22. doi: 10.1111/j.1365-2516.2011.02519.x. Epub , 2011 Apr 3. PMID:21457405 doi:10.1111/j.1365-2516.2011.02519.x
- ↑ Lee JH, Cho HS, Hyun MS, Kim HY, Kim HJ. A novel missense mutation Asp506Gly in Exon 13 of the F11 gene in an asymptomatic Korean woman with mild factor XI deficiency. Korean J Lab Med. 2011 Oct;31(4):290-3. doi: 10.3343/kjlm.2011.31.4.290. Epub, 2011 Oct 3. PMID:22016685 doi:10.3343/kjlm.2011.31.4.290
- ↑ Tirefort Y, Uhr MR, Neerman-Arbez M, de Moerloose P. Identification of a novel F11 missense mutation (Ile463Ser) in a family with congenital factor XI deficiency. Blood Coagul Fibrinolysis. 2012 Apr;23(3):251-2. doi:, 10.1097/MBC.0b013e32834ea02a. PMID:22322133 doi:10.1097/MBC.0b013e32834ea02a
- ↑ Girolami A, Scarparo P, Bonamigo E, Santarossa L, Cristiani A, Moro S, Lombardi AM. A cluster of factor XI-deficient patients due to a new mutation (Ile 436 Lys) in northeastern Italy. Eur J Haematol. 2012 Mar;88(3):229-36. doi: 10.1111/j.1600-0609.2011.01723.x., Epub 2011 Nov 17. PMID:21999818 doi:10.1111/j.1600-0609.2011.01723.x
- ↑ Gueguen P, Chauvin A, Quemener-Redon S, Pan-Petesch B, Ferec C, Abgrall JF, Le Marechal C. Revisiting the molecular epidemiology of factor XI deficiency: nine new mutations and an original large 4qTer deletion in western Brittany (France). Thromb Haemost. 2012 Jan;107(1):44-50. doi: 10.1160/TH11-06-0415. Epub 2011 Dec, 8. PMID:22159456 doi:10.1160/TH11-06-0415
- ↑ Koch AW, Schiering N, Melkko S, Ewert S, Salter J, Zhang Y, McCormack P, Yu J, Huang X, Chiu YH, Chen Z, Schleeger S, Horny G, DiPetrillo K, Muller L, Hein A, Villard F, Scharenberg M, Ramage P, Hassiepen U, Cote S, DeGagne J, Krantz C, Eder J, Stoll B, Kulmatycki K, Feldman DL, Hoffmann P, Basson CT, Frost RJA, Khder Y. MAA868, a novel FXI antibody with a unique binding mode, shows durable effects on markers of anticoagulation in humans. Blood. 2019 Mar 28;133(13):1507-1516. doi: 10.1182/blood-2018-10-880849. Epub, 2019 Jan 28. PMID:30692123 doi:https://dx.doi.org/10.1182/blood-2018-10-880849
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