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Tourbin M, Brouillet F, Galey B, Rouquet N, Gras P, Abi Chebel N, Grossin D, Frances C. Agglomeration of stoichiometric hydroxyapatite: Impact on particle size distribution and purity in the precipitation and maturation steps. POWDER TECHNOL 2020. [DOI: 10.1016/j.powtec.2019.10.050] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Grossin D, Broner J, Arnaud E, Goulabchand R, Gris JC. [Acquired autoimmune haemophilia: Where is the place of rituximab in the treatment strategy? Reflection from a monocentric series of 8 patients and literature review]. Rev Med Interne 2019; 40:574-580. [PMID: 30904179 DOI: 10.1016/j.revmed.2019.02.008] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2018] [Revised: 02/14/2019] [Accepted: 02/24/2019] [Indexed: 10/27/2022]
Abstract
INTRODUCTION Autoimmune acquired haemophilia is a rare autoimmune disease. The purpose of immunosuppressive therapy is to stop the production of autoantibodies that inhibit clotting factors VIII or IX. A corticosteroids-cyclophosphamide combination is recommanded as first-line therapy. From our experience at the University Hospital of Nîmes, we discuss the place of rituximab in the therapeutic arsenal. METHODS We report a monocentric observational retrospective study. Our data are discussed in light of literature data, in particular cohorts EACH2 and SACHA. RESULTS Eight patients (7 with FVIII anibodies) were consecutively included from 2005. The average age was 68.5 years with a male predominance (62.5%). Bleeding manifestations were usually spontaneous and superficial. A pathology, mostly autoimmune or neoplastic, was associated in 5/8 patients. A "by-pass" haemostatic treatment was prescribed for 3/8 patients. Rituximab was prescribed for 5/8 patients, three times as first-line therapy, and always associated with corticosteroids. Three patients received a cyclophosphamid/cortisone combination, two were treated exclusively with oral corticosteroids. Remission was obtained in all patients, without subsequent relapse. The average time to obtain remission under rituximab (after the first injection) was 32.5 days (10-143). The results observed in our series of patients are consistent with the data from the literature. CONCLUSIONS Rituximab appears to be an effective and well-tolerated treatment for autoimmune acquired haemophilia. However, its place remains to be specified.
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Affiliation(s)
- D Grossin
- Service de médecine interne, CHU Nîmes, 30029 Nîmes, France.
| | - J Broner
- Service de médecine interne, CHU Nîmes, 30029 Nîmes, France
| | - E Arnaud
- Service de médecine interne, CHU Nîmes, 30029 Nîmes, France
| | - R Goulabchand
- Département de médecine interne maladies multi-organiques, CHU Saint-Éloi, Montpellier, France
| | - J C Gris
- Service d'hématologie, CHU Nîmes, 30029 Nîmes, France
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Dumain C, Grossin D, Viala M, Broner J. Lénalidomide : Une nouvelle alternative thérapeutique dans la prise en charge des angiodysplasies digestives. Rev Med Interne 2018. [DOI: 10.1016/j.revmed.2018.10.170] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Visan A, Stan GE, Ristoscu C, Popescu-Pelin G, Sopronyi M, Besleaga C, Luculescu C, Chifiriuc MC, Hussien MD, Marsan O, Kergourlay E, Grossin D, Brouillet F, Mihailescu IN. Combinatorial MAPLE deposition of antimicrobial orthopedic maps fabricated from chitosan and biomimetic apatite powders. Int J Pharm 2016; 511:505-515. [PMID: 27418570 DOI: 10.1016/j.ijpharm.2016.07.015] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2016] [Revised: 07/08/2016] [Accepted: 07/09/2016] [Indexed: 11/30/2022]
Abstract
Chitosan/biomimetic apatite thin films were grown in mild conditions of temperature and pressure by Combinatorial Matrix-Assisted Pulsed Laser Evaporation on Ti, Si or glass substrates. Compositional gradients were obtained by simultaneous laser vaporization of the two distinct material targets. A KrF* excimer (λ=248nm, τFWHM=25ns) laser source was used in all experiments. The nature and surface composition of deposited materials and the spatial distribution of constituents were studied by SEM, EDS, AFM, GIXRD, FTIR, micro-Raman, and XPS. The antimicrobial efficiency of the chitosan/biomimetic apatite layers against Staphylococcus aureus and Escherichia coli strains was interrogated by viable cell count assay. The obtained thin films were XRD amorphous and exhibited a morphology characteristic to the laser deposited structures composed of nanometric round shaped grains. The surface roughness has progressively increased with chitosan concentration. FTIR, EDS and XPS analyses indicated that the composition of the BmAp-CHT C-MAPLE composite films gradually modified from pure apatite to chitosan. The bioevaluation tests indicated that S. aureus biofilm is more susceptible to the action of chitosan-rich areas of the films, whilst the E. coli biofilm proved more sensible to areas containing less chitosan. The best compromise should therefore go, in our opinion, to zones with intermediate-to-high chitosan concentration which can assure a large spectrum of antimicrobial protection concomitantly with a significant enhancement of osseointegration, favored by the presence of biomimetic hydroxyapatite.
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Affiliation(s)
- A Visan
- National Institute for Laser, Plasma and Radiation Physics, 077125 Magurele-Ilfov, Romania
| | - G E Stan
- National Institute of Materials Physics, 077125 Magurele-Ilfov, Romania
| | - C Ristoscu
- National Institute for Laser, Plasma and Radiation Physics, 077125 Magurele-Ilfov, Romania
| | - G Popescu-Pelin
- National Institute for Laser, Plasma and Radiation Physics, 077125 Magurele-Ilfov, Romania
| | - M Sopronyi
- National Institute for Laser, Plasma and Radiation Physics, 077125 Magurele-Ilfov, Romania
| | - C Besleaga
- National Institute of Materials Physics, 077125 Magurele-Ilfov, Romania
| | - C Luculescu
- National Institute for Laser, Plasma and Radiation Physics, 077125 Magurele-Ilfov, Romania
| | - M C Chifiriuc
- Department of Microbiology, Faculty of Biology, University of Bucharest, 060101 Bucharest, Romania; Earth, Environmental and Life Sciences Division, Research Institute of the University of Bucharest, 77206 Bucharest, Romania
| | - M D Hussien
- Department of Microbiology, Faculty of Biology, University of Bucharest, 060101 Bucharest, Romania; Earth, Environmental and Life Sciences Division, Research Institute of the University of Bucharest, 77206 Bucharest, Romania
| | - O Marsan
- University of Toulouse, CIRIMAT, UPS INPT CNRS, ENSIACET, 4 Allée Emile Monso, 31030 Toulouse Cedex 4, France
| | - E Kergourlay
- University of Toulouse, CIRIMAT, UPS INPT CNRS, ENSIACET, 4 Allée Emile Monso, 31030 Toulouse Cedex 4, France
| | - D Grossin
- University of Toulouse, CIRIMAT, UPS INPT CNRS, ENSIACET, 4 Allée Emile Monso, 31030 Toulouse Cedex 4, France
| | - F Brouillet
- University of Toulouse, CIRIMAT, UPS INPT CNRS, ENSIACET, 4 Allée Emile Monso, 31030 Toulouse Cedex 4, France
| | - I N Mihailescu
- National Institute for Laser, Plasma and Radiation Physics, 077125 Magurele-Ilfov, Romania.
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Grossin D, Guilhem A, Cerruti D, Guilpain P, Le Quellec A, Rivière S. Neuropathie optique ischémique antérieure : intérêt d’une biopsie d’artère temporale systématique ? Discussion à propos de 2 cas. Rev Med Interne 2015. [DOI: 10.1016/j.revmed.2015.03.136] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Demnati I, Grossin D, Errassifi F, Combes C, Rey C, Le Bolay N. Synthesis of fluor-hydroxyapatite powder for plasma sprayed biomedical coatings: Characterization and improvement of the powder properties. POWDER TECHNOL 2014. [DOI: 10.1016/j.powtec.2013.10.022] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Demnati I, Grossin D, Combes C, Parco M, Braceras I, Rey C. A comparative physico-chemical study of chlorapatite and hydroxyapatite: from powders to plasma sprayed thin coatings. Biomed Mater 2012; 7:054101. [PMID: 22971953 DOI: 10.1088/1748-6041/7/5/054101] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Due to their bioactivity and osteoconductivity, hydroxyapatite (HA) plasma sprayed coatings have been widely developed for orthopedic uses. However, the thermodynamic instability of HA leads frequently to a mixture of phases which limit the functional durability of the coating. This study investigates the plasma spraying of chlorapatite (ClA) powder, known to melt without decomposition, onto pure titanium substrates using a low energy plasma spray system (LEPS). Pure ClA powder was prepared by a solid gas reaction at 950 °C and thermogravimetric analysis showed the good thermal stability of ClA powder in the range 30-1400 °C compared to that of the HA powder. Characterization of ClA coating showed that ClA had a very high crystalline ratio and no other crystalline phase was detected in the coating. HA and ClA coatings composition, microstructure and in vitro bioactivity potential were studied, compared and discussed. In vitro SBF test on HA and ClA coatings revealed the formation of a poorly crystalline apatite on the coating surface suggesting that we could expect a good osteoconductivity especially for the ClA coating prepared by the LEPS system.
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Affiliation(s)
- I Demnati
- Université de Toulouse, CIRIMAT CNRS-INPT-UPS, ENSIACET, Toulouse, France.
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