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Crémet L, Joffraud L, Eschapasse E, Bihouée T, Tissot A, Gibaud S, Persyn E. In Vitro Comparison of Aztreonam/Amoxicillin-Clavulanate Versus Aztreonam/Ceftazidime-Avibactam on Ceftazidime-Avibactam Resistant Stenotrophomonas maltophilia. Microb Drug Resist 2022; 28:877-881. [PMID: 35763306 DOI: 10.1089/mdr.2021.0389] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
We investigated the in vitro susceptibility of ceftazidime-avibactam (CZA) resistant Stenotrophomonas maltophilia to the associations aztreonam/amoxicillin-clavulanate (ATM-AMC) and ATM-CZA. Forty clinical isolates of S. maltophilia recovered from sputum samples of 40 cystic fibrosis people were selected from the collection of the Nantes University Hospital, based on their resistance to CZA. Minimum inhibitory concentrations (MICs) of ATM-CZA and ATM-AMC were determined for each isolate by an Etest strip superposition method, and by Etest for each individual antibiotic. MICs of CZA, ATM, and AMC ranged from 12 to ≥256, ≥256, and 16 to ≥256 mg/L, respectively. Synergistic effects were observed with the ATM-CZA combination for all isolates (fractional inhibitory concentration index range of 0.01 to 0.27), with combination MICs ranging from 0.75 to 16 mg/L (MIC50/90 = 3/12 mg/L), corresponding to a decrease of at least 16-folds in the MIC of ATM. In 23 (57.5%) S. maltophilia isolates, the association of AMC to ATM was also synergistic and combination MICs were ≤16 mg/L (EUCAST breakpoint for ATM resistance in Pseudomonas aeruginosa). Our results show that ATM-CZA or ATM-AMC could be alternative therapeutic options against some highly resistant S. maltophilia. This encourages further experimental studies, in particular time-kill analyses, and clinical trials to delineate conditions required for use of these combinations in practice.
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Affiliation(s)
- Lise Crémet
- Service de Bactériologie-Hygiène, Pôle de Biologie, CHU Nantes, Nantes, France.,CHU Nantes, INSERM, Center for Research in Transplantation and Translational Immunology, UMR 1064, Nantes Université, Nantes, France
| | - Léo Joffraud
- Service de Bactériologie-Hygiène, Pôle de Biologie, CHU Nantes, Nantes, France
| | | | - Tiphaine Bihouée
- CRCM pédiatrique, Hôpital Mère-enfant, CHU Nantes, Nantes, France
| | - Adrien Tissot
- Service de Pneumologie, Hôpital Nord Laennec, CHU Nantes, Nantes, France
| | - Sophie Gibaud
- Service de Bactériologie-Hygiène, Pôle de Biologie, CHU Nantes, Nantes, France
| | - Elise Persyn
- Service de Bactériologie-Hygiène, Pôle de Biologie, CHU Nantes, Nantes, France
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2
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Crémet L, Gaborit B, Bouras M, Drumel T, Guillotin F, Poulain C, Persyn E, Lakhal K, Rozec B, Vibet MA, Roquilly A, Gibaud S. Evaluation of the FilmArray ® Pneumonia Plus Panel for Rapid Diagnosis of Hospital-Acquired Pneumonia in Intensive Care Unit Patients. Front Microbiol 2020; 11:2080. [PMID: 32983057 PMCID: PMC7477898 DOI: 10.3389/fmicb.2020.02080] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2020] [Accepted: 08/07/2020] [Indexed: 12/19/2022] Open
Abstract
The FilmArray® Pneumonia plus Panel (FAPP) is a new multiplex molecular test for hospital-acquired pneumonia (HAP), which can rapidly detect 18 bacteria, 9 viruses, and 7 resistance genes. We aimed to compare the diagnosis performance of FAPP with conventional testing in 100 intensive care unit (ICU) patients who required mechanical ventilation, with clinically suspected HAP. A total of 237 samples [76 bronchoalveolar lavages (BALDS) and 82 endotracheal aspirates (ETADS) obtained at HAP diagnosis, and 79 ETA obtained during follow-up (ETATT)], were analyzed independently by routine microbiology testing and FAPP. 58 patients had paired BALDS and ETADS. The positivity thresholds of semi-quantified bacteria were 103–104 CFUs/mL or 104 copies/mL for BAL, and 105 CFUs/mL or copies/mL for ETA. Respiratory commensals (H. influenzae, S. aureus, E. coli, S. pneumoniae) were the most common pathogens. Discordant results for bacterial identification were observed in 33/76 (43.4%) BALDS and 36/82 (43.9%) ETADS, and in most cases, FAPP identified one supplemental bacteria (23/33 BALDS and 21/36 ETADS). An absence of growth, or polybacterial cultures, explained almost equally the majority of the non-detections in culture. No linear relationship was observed between bin and CFUs/mL variables. Concordant results between paired BALDS and ETADS were obtained in 46/58 (79.3%) patients with FAPP. One of the 17 resistance genes detected with FAPP (mecA/C and MREJ) was not confirmed by conventional testing. Overall, FAPP enhanced the positivity rate of diagnostic testing, with increased recognition of coinfections. Implementing this strategy may allow clinicians to make more timely and informed decisions.
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Affiliation(s)
- Lise Crémet
- Service de Bactériologie-Hygiène, Pôle de Biologie, CHU Nantes, Nantes, France.,Laboratoire UPRES EA3826, IRS2 - Nantes Biotech, Université de Nantes, Nantes, France
| | - Benjamin Gaborit
- Laboratoire UPRES EA3826, IRS2 - Nantes Biotech, Université de Nantes, Nantes, France.,Service de Maladies Infectieuses et Tropicales et CIC 1413, CHU Nantes, Nantes, France
| | - Marwan Bouras
- Laboratoire UPRES EA3826, IRS2 - Nantes Biotech, Université de Nantes, Nantes, France.,Service d'Anesthésie Réanimation Chirurgicale, Pôle Anesthésie-Réanimation, CHU Nantes, Nantes, France
| | - Thomas Drumel
- Service de Bactériologie-Hygiène, Pôle de Biologie, CHU Nantes, Nantes, France
| | - Florian Guillotin
- Service d'Anesthésie Réanimation Chirurgicale, Pôle Anesthésie-Réanimation, CHU Nantes, Nantes, France
| | - Cécile Poulain
- Service d'Anesthésie Réanimation Chirurgicale, Pôle Anesthésie-Réanimation, CHU Nantes, Nantes, France
| | - Elise Persyn
- Service de Bactériologie-Hygiène, Pôle de Biologie, CHU Nantes, Nantes, France
| | - Karim Lakhal
- Service de Réanimation en Chirurgie Polyvalente, Pôle Anesthésie-Réanimation, Hôpital Nord Laennec, CHU Nantes, Nantes, France
| | - Bertrand Rozec
- Service de Réanimation en Chirurgie Cardio-Thoracique et Vasculaire, Pôle Anesthésie-Réanimation, Hôpital Nord Laennec, CHU Nantes, Nantes, France
| | - Marie-Anne Vibet
- Plateforme de Méthodologie et Biostatistique, CHU Nantes, Nantes, France
| | - Antoine Roquilly
- Laboratoire UPRES EA3826, IRS2 - Nantes Biotech, Université de Nantes, Nantes, France.,Service d'Anesthésie Réanimation Chirurgicale, Pôle Anesthésie-Réanimation, CHU Nantes, Nantes, France
| | - Sophie Gibaud
- Service de Bactériologie-Hygiène, Pôle de Biologie, CHU Nantes, Nantes, France
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Lécuyer R, Boutoille D, Khatchatourian L, Ducloyer JB, Gibaud S, Raffi F, Gaborit B. Listeria Endophthalmitis Cured With Linezolid in an Immunocompetent Farmer Woman: Hazard of a Sweep of a Cow's Tail. Open Forum Infect Dis 2020; 6:ofz459. [PMID: 32377543 PMCID: PMC7194287 DOI: 10.1093/ofid/ofz459] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2019] [Accepted: 10/22/2019] [Indexed: 11/16/2022] Open
Abstract
We report the first case of an unexpected exogenous Listeria monocytogenes endophthalmitis in a previously healthy woman after a cow’s tail’s sweep, successfully treated with surgery and linezolid. It is the first case carried out with linezolid to treat Listeria endophthalmitis. Therefore, it may challenge the requirement for intravenous antibiotics for long-term treatment.
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Affiliation(s)
- Romain Lécuyer
- Infectious Diseases Department, Hotel-Dieu Hospital and INSERM Clinical Investigation Center, Nantes University Hospital, Nantes, France.,Equipe d'Accueil 3826 Thérapeutiques Cliniques et Expérimentales des Infections, University of Nantes, Nantes, France
| | - David Boutoille
- Infectious Diseases Department, Hotel-Dieu Hospital and INSERM Clinical Investigation Center, Nantes University Hospital, Nantes, France.,Equipe d'Accueil 3826 Thérapeutiques Cliniques et Expérimentales des Infections, University of Nantes, Nantes, France
| | - Lydie Khatchatourian
- Infectious Diseases Department, Hotel-Dieu Hospital and INSERM Clinical Investigation Center, Nantes University Hospital, Nantes, France
| | - Jean-Baptiste Ducloyer
- Department of Ophthalmology, Hotel-Dieu Hospital, Nantes University Hospital, Nantes, France
| | - Sophie Gibaud
- Department of Bacteriology and Hygiene, Hotel-Dieu Hospital, Nantes University Hospital, Nantes, France
| | - François Raffi
- Infectious Diseases Department, Hotel-Dieu Hospital and INSERM Clinical Investigation Center, Nantes University Hospital, Nantes, France
| | - Benjamin Gaborit
- Infectious Diseases Department, Hotel-Dieu Hospital and INSERM Clinical Investigation Center, Nantes University Hospital, Nantes, France.,Equipe d'Accueil 3826 Thérapeutiques Cliniques et Expérimentales des Infections, University of Nantes, Nantes, France
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Lemarchand M, Lefebvre M, Kempf M, Gibaud S, Letourneau B, Coutherut J, Raffi F. Apport de la biologie moléculaire pour le diagnostic des infections invasives à méningocoques. Med Mal Infect 2018. [DOI: 10.1016/j.medmal.2018.04.304] [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: 11/29/2022]
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Gibaud S, Thomas E, Crémet L, Coutherut J, Bernier C, Lefebvre M, Pereyre S, Caillon J. Évaluation du kit ResistancePlus™ MG assay de SpeedDx pour la détection simultanée de Mycoplasma genitalium et de la résistance à l’azithromycine. Med Mal Infect 2018. [DOI: 10.1016/j.medmal.2018.04.248] [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: 10/14/2022]
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6
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Lefebvre M, Coutherut J, Gibaud S, Biron C, Chalopin M, Bernier C, Raffi F. Prevalence of Mycoplasma genitalium Infection and Relationship with Symptoms Among Adults Attending a Sexual Health Centre. Acta Derm Venereol 2017; 97:543-545. [PMID: 27882384 DOI: 10.2340/00015555-2585] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Affiliation(s)
- Maeva Lefebvre
- Centre for Prevention of Infectious and Transmissible Diseases, Nantes University Hospital, 44093 cedex1 Nantes, France.
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Bémer P, Plouzeau C, Tande D, Léger J, Giraudeau B, Valentin AS, Jolivet-Gougeon A, Vincent P, Corvec S, Gibaud S, Juvin ME, Héry-Arnaud G, Lemarié C, Kempf M, Bret L, Quentin R, Coffre C, de Pinieux G, Bernard L, Burucoa C. Evaluation of 16S rRNA gene PCR sensitivity and specificity for diagnosis of prosthetic joint infection: a prospective multicenter cross-sectional study. J Clin Microbiol 2014; 52:3583-9. [PMID: 25056331 PMCID: PMC4187742 DOI: 10.1128/jcm.01459-14] [Citation(s) in RCA: 129] [Impact Index Per Article: 12.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2014] [Accepted: 07/17/2014] [Indexed: 01/30/2023] Open
Abstract
There is no standard method for the diagnosis of prosthetic joint infection (PJI). The contribution of 16S rRNA gene PCR sequencing on a routine basis remains to be defined. We performed a prospective multicenter study to assess the contributions of 16S rRNA gene assays in PJI diagnosis. Over a 2-year period, all patients suspected to have PJIs and a few uninfected patients undergoing primary arthroplasty (control group) were included. Five perioperative samples per patient were collected for culture and 16S rRNA gene PCR sequencing and one for histological examination. Three multicenter quality control assays were performed with both DNA extracts and crushed samples. The diagnosis of PJI was based on clinical, bacteriological, and histological criteria, according to Infectious Diseases Society of America guidelines. A molecular diagnosis was modeled on the bacteriological criterion (≥ 1 positive sample for strict pathogens and ≥ 2 for commensal skin flora). Molecular data were analyzed according to the diagnosis of PJI. Between December 2010 and March 2012, 264 suspected cases of PJI and 35 control cases were included. PJI was confirmed in 215/264 suspected cases, 192 (89%) with a bacteriological criterion. The PJIs were monomicrobial (163 cases [85%]; staphylococci, n = 108; streptococci, n = 22; Gram-negative bacilli, n = 16; anaerobes, n = 13; others, n = 4) or polymicrobial (29 cases [15%]). The molecular diagnosis was positive in 151/215 confirmed cases of PJI (143 cases with bacteriological PJI documentation and 8 treated cases without bacteriological documentation) and in 2/49 cases without confirmed PJI (sensitivity, 73.3%; specificity, 95.5%). The 16S rRNA gene PCR assay showed a lack of sensitivity in the diagnosis of PJI on a multicenter routine basis.
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Affiliation(s)
- Pascale Bémer
- CHU Nantes, Laboratoire de Bactériologie, Nantes, France
| | - Chloé Plouzeau
- CHU Poitiers, Laboratoire de Bactériologie, Poitiers, France
| | - Didier Tande
- CHU Brest, Laboratoire de Bactériologie, Brest, France
| | | | | | | | | | - Pascal Vincent
- CHU Rennes, Laboratoire de Bactériologie, Rennes, France
| | | | - Sophie Gibaud
- CHU Nantes, Laboratoire de Bactériologie, Nantes, France
| | | | | | | | | | - Laurent Bret
- CHU Orléans, Laboratoire de Bactériologie, Orléans, France
| | | | | | | | - Louis Bernard
- CHU Tours, Service des Maladies Infectieuses, Tours, France
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Attivi D, Gibaud S. Continuous infusion of piperacillin/tazobactam in patients with severe infections: A possible pharmacokinetic optimisation? Annales Pharmaceutiques Françaises 2014; 72:146-51. [DOI: 10.1016/j.pharma.2013.12.006] [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] [Received: 09/27/2013] [Revised: 12/12/2013] [Accepted: 12/19/2013] [Indexed: 11/30/2022]
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Alfonsi R, Attivi D, Astier A, Socha M, Morice S, Gibaud S. Characterization of mitotane (o,p'-DDD)--cyclodextrin inclusion complexes: phase-solubility method and NMR. Ann Pharm Fr 2013; 71:186-92. [PMID: 23622697 DOI: 10.1016/j.pharma.2013.02.001] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2012] [Revised: 01/25/2013] [Accepted: 02/05/2013] [Indexed: 10/27/2022]
Abstract
Mitotane (o,p'-dichlorodimethyl dichloroethane [o,p'-DDD]) is used for the treatment of adrenocortical cancer and occasionally Cushing's syndrome. This drug is very poorly soluble in water, and following oral administration, approximately 60% of the dose is recovered in the feces unaltered. The preparation of a soluble formulation (i.e. by complexation with cyclodextrins) with improved bioavailability is the aim of this work. The inclusion of mitotane in methyl-ß-cyclodextrins was studied using both phase-solubility methods and NMR experiments. To elucidate the inclusion mechanism, o,p'-DDD was compared to its regioisomer (i.e. p,p'-DDD). It was demonstrated that two dimethyl-ß-cyclodextrins (DMßCD) can complex with the aromatic rings. From the phase-solubility diagrams, we observe that both cases are very different: K(1:1) is between 37 000 and 85 000 mol.l(-1), whereas K(1:2) is between 5.3 and 32 mol.l(-1). The NMR experiments confirmed the inclusion but it also gave an insight into the kinetics of the dissociation: the ortho-chloro moiety is in slow exchange on the NMR time scale, whereas the para-chloro moiety is in fast exchange rate.
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Affiliation(s)
- R Alfonsi
- Équipe CITHEFOR (EA3452), université de Lorraine, 5, rue Albert-Lebrun, 54000 Nancy, France
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Ajana I, Astier A, Lanhers M, Demoré B, Socha M, Gibaud S. 1217 Dithiarsolanes in the treatment of glioma: in vitro activity on U87 cell line and brain concentrations on a mouse model. EJC Suppl 2009. [DOI: 10.1016/s1359-6349(09)70429-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022] Open
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Attivi D, Janin V, Capitain A, Santangelo P, Lamaze R, Brizard P, Gibaud S. N-06 Impact des recommandations de bon usage sur l’efficacité et le coût de l’antibiothérapie en Médecine. Med Mal Infect 2009. [DOI: 10.1016/s0399-077x(09)74463-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Abstract
Inclusion complexes of nefopam base (NEF) with various beta-cyclodextrins (betaCDs) were investigated. All tested betaCDs increased the apparent solubility of NEF according to a Higuchi AL type plot (except betaCD: AN type plot), which indicates the formation of 1:1 stoichiometry inclusion complexes. 1H-NMR and 13C-NMR experiments showed that complexation by CDs allowed an easy separation of the R and S enantiomers. Based on spectral data obtained from the two-dimensional rotating frame nuclear Overhauser effect spectroscopy (2D-ROESY), a reasonable geometry for the complexes could be proposed implicating the insertion of the benzoxazocine ring into the wide end of the torus cavity.
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Affiliation(s)
- H Brun
- Laboratoire de Pharmacotechnie, Service de Pharmacie, Hôpital Henri Mondor, Créteil, France
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13
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Gibaud S, Astier A. Organoarséniés dérivés du 2-phényl- [1,3,2]dithiarsolane-4-yl)-méthanol (AsIII) à propriétés antileucémiques : des trypanosomicides aux anticancéreux. Annales Pharmaceutiques Françaises 2007; 65:162-8. [PMID: 17489071 DOI: 10.1016/s0003-4509(07)90031-0] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
For several decades, organometallic and organometalloid compounds have played an important part in anticancer chemotherapies, in particular those derived from platinum. Trivalent arsenic, in the form of arsenic trioxide (As2O3; Trisenox(R)) is currently used in the treatment of refractory leukemias, but at the cost of major adverse effects. Moreover, recent studies showed that the trypanocide melarsoprol, could be more effective than arsenic trioxide on myelogenous leukaemias. We have synthesized a series of derivatives from 2-phenyl-[1,3,2]dithiarsolan-4-yl)-methanol (AsIII). Our work shows that the substitution of the aromatic ring by an iodine atom in the ortho position or by an amino-dimethoxytriazin group in the para position increases very significantly the antileukemic activity and improves the therapeutic index (IT=LD50/IC50) of these melarsoprol-derivatives molecules, as compared to arsenic trioxide. However, one of the most promising compounds seems to be arsthinol, an old drug used in the past as an amebicide. Nanoparticle carriers of melarsoprol were also prepared for the purpose of modifying its tissue distribution reduce its brain toxicity.
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Affiliation(s)
- S Gibaud
- Laboratoire de Pharmacie Clinique, EA 3452, Faculté de Pharmacie, Université Henri Poincaré, 5 rue Albert Lebrun, F 54000 Nancy.
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Gibaud S, Weingarten C, Andreux JP, Couvreur P. [Targeting bone marrow with the help of polyalkylcyanoacrylate nanoparticles]. Ann Pharm Fr 1999; 57:324-31. [PMID: 10472705] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/13/2023]
Abstract
Using a mouse model, we examine drug targeting towards bone marrow. One cytotoxic (doxorubicin) and one stimulating (rhG-CSF), bound to polyalkylcyanoacrylate nanoparticles, were studied. Histological studies, using a fluorescence microscope, showed rapid capture of nanoparticles by bone marrow macrophages and granulocytes as soon as 15 minutes after injection into the blood stream. Doxorubicin nanoparticles, administered at a dose of 11 mg/kg were more toxic than free doxorubicin on all blood and marrow cell lines. Moreover, the choice of the nature of the polymer had an influence on toxicity: doxorubicin polyisohexylcyanoacrylate nanoparticles were more toxic than polyisobutylcyanoacrylate particles. Quantification of doxorubicin in bone marrow has confirmed these results. The bone marrow concentrations observed demonstrated that there was a high level of targeting towards the bone marrow that would be very interesting to use for a stimulating drug. Nevertheless, rhG-CSF nanoparticles did not show better efficacy than free rhG-CSF.
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Affiliation(s)
- S Gibaud
- Laboratoire de Physico-Chimie, Pharmacotechie et Biopharmacie, URA-CNRS 1218, Université Paris XI, Châtenay-Malabry
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15
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Gibaud S, Rousseau C, Weingarten C, Favier R, Douay L, Andreux JP, Couvreur P. Polyalkylcyanoacrylate nanoparticles as carriers for granulocyte-colony stimulating factor (G-CSF). J Control Release 1998; 52:131-9. [PMID: 9685943 DOI: 10.1016/s0168-3659(97)00194-6] [Citation(s) in RCA: 43] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The human recombinant granulocyte colony-stimulating factor (rhG-CSF) is largely used in the treatment of neutropenia occurring during chemotherapy. After injection, this glycoprotein distributes through the whole body. Thus, to obtain high and durable bone marrow concentrations, targeting with polyalkylcyanoacrylate nanoparticles was considered. Two methods of preparation were investigated: anionic polymerization and precipitation of the preformed polymer. By anionic polymerization, it was possible to associate more than 66% of rhG-CSF with nanoparticles (polyisobutyl- or polyisohexylcyanoacrylate nanoparticles) when the glycoprotein was added at the end of the polymerization process. It has been shown that the rhG-CSF was mainly adsorbed on the surface of the nanoparticles and most of the colony stimulating activity was conserved. Using precipitation of performed polyisohexylcyanoacrylate, 90% of rhG-CSF was associated with nanoparticles, the protein being mainly adsorbed onto the nanoparticle surface. In this case, a decrease of the colony stimulating activity was however observed. Whatever the method used, the in vitro release of rhG-CSF from the polyisohexylcyanoacrylate nanoparticles, was progressive during 8 h in seric conditions. Nevertheless, using mice as an animal model, it has been shown that the short-term effects of intravenously injected rhG-CSF were not increased by its association with polyisohexylcyanoacrylate nanoparticles.
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Affiliation(s)
- S Gibaud
- Laboratoire de Physico-Chimie, Pharmacotechnie et Biopharmacie, URA-CNRS 1218, Université Paris XI, Châtenay-Malabry, France
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Abstract
PURPOSE To identify more accurately in the spleen, the areas and the cells where nanoparticulate carriers were taken up from the blood flow, a series of complementary approaches were used. METHODS First, in and ex vivo examination of the whole spleen led to a global view of all the trapping areas. Then, histological studies on frozen sections of the same organ allowed for a more precise localization of these areas and image analysis gave an evaluation of tissue distribution of the nanoparticles. Finally, immunological and enzymological characteristics of the capturing cells were determined in situ, using monoclonal antibodies (F4/80 and anti-sialoadhesin) and cytochemical reactions (esterases and acid phosphatase). Furthermore incubation of spleen slices with different nanoparticles was used so as to know if the capture was due to a high capturing capacity of these cells or to a high blood flow in their vicinity. RESULTS It was shown that more than 90% of the splenic capture was localized in the marginal zone of the follicles. The capturing cells form a special population of macrophages inserted in a reticular meshwork, showing low esterase and acid phosphatase activities, giving faint or no reaction with F4/80 or anti-sialoadhesin antibodies. The circulating nanoparticles were quickly trapped with rather low specificity by these cells. CONCLUSIONS Combination of coherent approaches allowed for the tracking of capturing cells from in vivo observations to their in situ identification on immunological and enzymological criteria.
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Affiliation(s)
- M Demoy
- Laboratoire de Physico-Chimie, Pharmacotechnie et Biopharmacie, URA CNRS 1218, Faculté de Pharmacie, Université Paris XI, Châtenay-Malabry, France
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17
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Abstract
The affinity of nanoparticles for hematopoietic organs could be valuable for the targeting of certain stimulating factors to those tissues, but this affinity should also be taken into account in the toxicological evaluation of those carriers, especially when they are loaded with antimitotic compounds such as doxorubicin. However, the cells responsible for the capture of the nanoparticles and their localization in these organs is an important point to know before trying to modulate the nanoparticle's tissue distribution. Thus, we have studied, in this paper, the capture, the localization, and the retention in the bone marrow and in the spleen of biodegradable poly(isohexyl cyanoacrylate) nanoparticles as well as of nonbiodegradable polystyrene nanoparticles. The histological localization of these nanoparticles has been completed by cytological localization with a method used in cytochemistry for the evaluation of intracellular accumulation of various substances, such as iron deposits in bone marrow sideroblasts. These data indicate that, in the bone marrow, after a quick passage through the endothelium, nanoparticles were dispersed throughout in the tissue and captured by all types of phagocytizing cells. In the spleen, nanoparticles were mainly localized in large angular capturing cells in the marginal zone of the lymphoid follicles.
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Affiliation(s)
- S Gibaud
- Laboratoire de Physico-Chimie, Pharmacotechnie et Biopharmacie, URA-CNRS 1218, Faculté de Pharmacie, Université Paris XI, Châtenay-Malabry, France
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18
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Abstract
The in vivo myelosuppressive effects of free and polyalkylcyanoacrylate-bound doxorubicin were compared in a mouse model. After intravenous administration of 11 mg/kg body weight of doxorubicin either free or bound to polyisobutyl (doxo-PIBCA) or polyisohexylcyanoacrylate (doxo-PIHCA) nanoparticles, we studied the total and differential counts of blood, bone marrow and spleen cells; the number of granulocyte progenitors (CFU-GM) was determined by culture. Doxorubicin concentrations were measured with an HPLC method in the bone marrow and the spleen. Doxo-PIHCA nanoparticles showed the highest and longest myelosuppressive effects which correlated well with a high concentration of the drug in the bone marrow and the spleen. Moreover, it was found that PIHCA nanoparticles induced the release of colony stimulating factors, which might account for the observed increase of toxic effects of doxorubicin on bone marrow progenitors. These data also indicate that a more precise evaluation of the myelosuppressive effects of targeted formulations of anticancer drugs is needed, which may be attained by studies on bone marrow progenitors.
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Affiliation(s)
- S Gibaud
- Laboratoire de Pharmacie Galénique, U.R.A. CNRS 1218, France
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