Publications by authors named "Micheline Berruyer"

4 Publications

  • Page 1 of 1

Chilblain lupus erythematosus treated successfully with mycophenolate mofetil.

Int J Dermatol 2017 08 27;56(8):e158-e159. Epub 2017 Mar 27.

Dermatology Department, Centre Hospitalier Lyon Sud, Pierre-Bénite, Lyon 1 University, France.

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August 2017

Age dependency for coagulation parameters in paediatric populations. Results of a multicentre study aimed at defining the age-specific reference ranges.

Thromb Haemost 2016 07 17;116(1):9-16. Epub 2016 Mar 17.

Dr. Pierre Toulon, CHU Nice, Hôpital Pasteur, Service d'Hématologie Biologique, 30, avenue de la Voie Romaine, CS 51069, F-06001 Nice Cedex 1, France, Tel.: + 33 4 92 03 87 09, Fax: + 33 4 92 03 85 95, E-mail:

Understanding of developmental haemostasis is critical to ensure optimal prevention, diagnosis, and treatment of haemorrhagic and thrombotic diseases in children. As coagulation test results are known to be dependent on the reagents/analysers used, it is recommended for each laboratory to define the age-dependent reference ranges by using its own technical condition. That study was carried out in seven centers to establish age-specific reference ranges using the same reagents and analyser. Plasma samples were obtained from 1437 paediatric patients from the following age groups: 15 days-4 weeks (n=36), 1-5 months (n=320), 6-12 months (n=176), 1-5 years (n=507), 6-10 years (n=132) and 11-17 years (n=262). Indication of coagulation testing was pre-operative screening for non-acute diseases in most cases. PT values were similar in the different age groups to those in adults, whereas longer aPTTs were demonstrated in the younger children. Plasma levels of all clotting factors, except for FV, were significantly decreased (p<0.0001) in the youngest children, adult values being usually reached before the end of the first year. The same applied to antithrombin, protein C/S, and plasminogen. In contrast, FVIII and VWF levels were elevated in the youngest children and returned to adult values within six months. The same applied to D-dimer levels, which were found elevated, particularly until six months of life, until puberty. These data suggest that most coagulation test results are highly dependent on age, mainly during the first year of life, and that age-specific reference ranges must be used to ensure proper evaluation of coagulation in children.
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July 2016

Characterization of seven novel mutations causing factor XI deficiency.

Haematologica 2007 Oct;92(10):1375-80

The Amalia Biron Research Institute of Thrombosis and Hemostasis, Chaim Sheba Medical Center, Tel-Hashomer and Sackler Faculty of Medicine, Tel Aviv University, Israel.

Background And Objectives: Factor XI (FXI) deficiency is a rare autosomal recessive disorder, the main manifestation of which is injury-related bleeding. The disorder is rare in most populations, but common among Jews in whom two mutations, E117X and F283L, account for 98% of cases. Other mutations, C38R and C128X, are prevalent in French Basques and Britons, respectively. Additional sporadic mutations have been described in most parts of the world. The objective of this study was to identify the mutations in 15 unrelated FXI-deficient patients and characterize missense mutations by expression in baby hamster kidney (BHK) cells.

Design And Methods: Clinical and laboratory information and DNA samples were obtained from the patients and mutations were identified by sequencing. Missense mutations were expressed in BHK cells and their effect on FXI secretion and dimerization was assessed using enzyme-linked immunosorbent assay and immunoblotting.

Results: Of 16 mutations detected, seven are novel including two deletions, one splice site and four missense mutations. Expression of the four novel missense mutations (C58Y, Y427C, C527Y and V20A) in cells revealed no secretion of FXI-C58Y, Y427C and C527Y and secretion of only 22% of normal in the medium for FXI-V20A. Secretion of FXI from BHK cells harboring a previously reported E297K substitution cells was also impaired (4.5% of wild-type). Homodimerization was normal for all five mutants.

Interpretation And Conclusions: Defective homodimerization of FXI was previously recognized as a major mechanism for defective secretion of FXI from producing cells. In this study, five FXI missense mutations (four novel) were associated with impaired secretion albeit normal dimerization, underscoring the existence of other mechanisms for defective secretion.
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October 2007

Cutaneous necrosis revealing the coexistence of an antiphospholipid syndrome with acquired protein S deficiency, factor V Leiden and hyperhomocysteinemia.

Eur J Dermatol 2002 May-Jun;12(3):278-82

Department of Dermatology, Instruction Military Hospital Desgenettes, 108, boulevard Pinel, 69003 Lyon, France.

Unlabelled: We report an exceptional case of cutaneous necrosis due to the coexistence of 4 thrombophilic factors, inherited and acquired. We would like to draw attention to these unrecognized associations.

Case Report: A 72-year-old woman was admitted with a 5 month history of necrotic nonhealing, painful ulcer of both legs and recently a purple toe. She had a history of 3 deep venous thromboses of the leg complicated by pulmonary embolism. A skin biopsy of the ulcer and purple toe showed only thrombosis in the dermal vessel. Laboratory findings showed a circulating lupus anticoagulant, positive anticardiolipin antibodies, antinuclear antibodies (1/320 dilution) and an anti Sm. Moreover, activated protein C resistance associated with factor V Leiden mutation and hyperhomocysteinemia was found; protein S was transiently low. With iloprost, oral anticoagulant, vitamin B12 and folic acid, the evolution was good, with healing of ulcer.

Comments: cutaneous necrosis can reveal hypercoagulable states, sometimes complex. We find 4 thrombophilic factors in our case, i.e. antiphospholipid antibodies, factor V Leiden, protein S deficiency and hyperhomocysteinemia. This is exceptional but highlights the role of several constitutional and acquired thrombophilic factors in the genesis of thrombosis. Extended protein C pathway disturbances could explain the mechanism that leads to cutaneous necrosis, in this patient, with an antiphospholipid syndrome. This case shows that it is necessary in some circumstances to make a complete hemostatic laboratory search to detect several thrombophilic factors. If they are present they can justify an oral anticoagulant treatment and a familial screening.
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May 2002