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1.
Front Immunol ; 13: 834878, 2022.
Artículo en Inglés | MEDLINE | ID: mdl-35392077

RESUMEN

Introduction: The "Renal Risk Score" (RRS) and the histopathological classification have been proposed to predict the risk of end-stage kidney disease (ESKD) in ANCA-associated glomerulonephritis (ANCA-GN). Besides, factors associated with kidney function recovery after ANCA-GN onset remain to be more extensively studied. In the present study, we analyzed the value of the RRS and of the histopathological classification for ESKD prediction. Next, we analyzed factors associated with eGFR change within the first 2 years following ANCA-GN diagnosis. Materials and Methods: We included patients from the Maine-Anjou ANCA-associated vasculitis registry with at least 6 months of follow-up. The values of ANCA-GN, histopathological classification, and RRS, and the factors associated with eGFR variations between ANCA-GN diagnosis and 2 years of follow-up were assessed. Results: The predictive values of the histopathological classification and RRS were analyzed in 123 patients. After a median follow-up of 42 months, 33.3% patients developed ESKD. The predictive value of RRS for ESKD was greater than that of the histopathological classification. Determinants of eGFR variation were assessed in 80/123 patients with complete eGFR measurement. The median eGFR increased from ANCA-GN diagnosis to month 6 and stabilized thereafter. The only factor associated with eGFR variation in our study was eGFR at ANCA-GN diagnosis, with higher eGFR at diagnosis being associated with eGFR loss (p<0.001). Conclusion: The RRS has a better predictive value for ESKD than the histopathological classification. The main determinant of eGFR variation at 2 years was eGFR at ANCA-GN diagnosis. Thus, this study suggests that eGFR recovery is poorly predicted by histological damage at ANCA-GN diagnosis.


Asunto(s)
Glomerulonefritis , Fallo Renal Crónico , Anticuerpos Anticitoplasma de Neutrófilos/análisis , Biopsia , Glomerulonefritis/patología , Humanos , Riñón/patología , Fallo Renal Crónico/diagnóstico , Fallo Renal Crónico/etiología , Fallo Renal Crónico/patología , Estudios Retrospectivos , Factores de Riesgo
2.
J Infect Dis ; 224(11): 1973-1983, 2021 12 01.
Artículo en Inglés | MEDLINE | ID: mdl-33944942

RESUMEN

Ketogenic diets have been used to treat diverse conditions, and there is growing evidence of their benefits for tissue repair and in inflammatory disease treatment. However, their role in infectious diseases has been little studied. Buruli ulcer (Mycobacterium ulcerans infection) is a chronic infectious disease characterized by large skin ulcerations caused by mycolactone, the major virulence factor of the bacillus. In the current study, we investigated the impact of ketogenic diet on this cutaneous disease in an experimental mouse model. This diet prevented ulceration, by modulating bacterial growth and host inflammatory response. ß-hydroxybutyrate, the major ketone body produced during ketogenic diet and diffusing in tissues, impeded M. ulcerans growth and mycolactone production in vitro underlying its potential key role in infection. These results pave the way for the development of new patient management strategies involving shorter courses of treatment and improving wound healing, in line with the major objectives of the World Health Organization.


Asunto(s)
Ácido 3-Hidroxibutírico , Úlcera de Buruli/prevención & control , Dieta Cetogénica , Macrólidos , Mycobacterium ulcerans , Animales , Modelos Animales de Enfermedad , Ratones , Cicatrización de Heridas
3.
Sci Adv ; 6(9): eaax7781, 2020 02.
Artículo en Inglés | MEDLINE | ID: mdl-32133396

RESUMEN

Buruli ulcer, a neglected tropical infectious disease, is caused by Mycobacterium ulcerans. Without treatment, its lesions can progress to chronic skin ulcers, but spontaneous healing is observed in 5% of cases, suggesting the possible establishment of a host strategy counteracting the effects of M. ulcerans. We reveal here a skin-specific local humoral signature of the spontaneous healing process, associated with a rise in antibody-producing cells and specific recognition of mycolactone by the mouse IgG2a immunoglobulin subclass. We demonstrate the production of skin-specific antibodies neutralizing the immunomodulatory activity of the mycolactone toxin, and confirm the role of human host machinery in triggering effective local immune responses by the detection of anti-mycolactone antibodies in patients with Buruli ulcer. Our findings pave the way for substantial advances in both the diagnosis and treatment of Buruli ulcer in accordance with the most recent challenges issued by the World Health Organization.


Asunto(s)
Anticuerpos Neutralizantes/inmunología , Toxinas Bacterianas/inmunología , Úlcera de Buruli/inmunología , Inmunoglobulina G/inmunología , Macrólidos/inmunología , Mycobacterium ulcerans/inmunología , Piel/inmunología , Animales , Úlcera de Buruli/microbiología , Ratones , Mycobacterium ulcerans/patogenicidad , Piel/microbiología
4.
J Clin Med ; 8(8)2019 Aug 14.
Artículo en Inglés | MEDLINE | ID: mdl-31416296

RESUMEN

BACKGROUND AND OBJECTIVES: The overlap between antineutrophil cytoplasmic antibody (ANCA) associated glomerulonephritis (ANCA-GN) and connective tissue diseases (CTD) has been reported mainly as case series in the literature. Frequency of this association, as well as presentation and outcomes are unknown. MATERIALS AND METHODS: Patients from the Maine-Anjou ANCA-associated vasculitides (AAV) registry with ANCA-GN diagnosed between 01/01/2000 and 01/01/2018, ANCA positivity, and at least six months of follow-up, were included. RESULTS: 106 out of 142 patients fulfilled the inclusion criteria and were analyzed. CTD was present at ANCA-GN diagnosis in 16 (15.1%) patients. The most common CTD were rheumatoid arthritis, Sjogren syndrome and systemic sclerosis. Compared to the control group, females were more represented in the CTD group (75%, p = 0.001). Renal presentation was comparable between groups, including the pathological analysis of renal biopsies. Patients of CTD group presented a higher rate of non-renal relapse (25% versus 7.7%, p = 0.037), and experienced more frequently a venous thrombotic event (31.2% versus 10%, p = 0.021). No difference between groups was observed according to major outcomes. CONCLUSION: Association between CTD and ANCA-GN is not a rare condition and predominantly affects females. While AAV presentation is not significantly different, CTD patients experience more frequently non-renal relapse and venous thrombotic events.

5.
BMC Nephrol ; 20(1): 334, 2019 08 27.
Artículo en Inglés | MEDLINE | ID: mdl-31455233

RESUMEN

BACKGROUND: The value of ANCA positivity in the setting of systemic lupus erythematous and their pathogenicity remains uncertain. CASE PRESENTATION: We report the case of a 48-year-old female with rapidly progressive kidney failure, arthro-myalgia and weight loss. Auto-immune screening showed anti-dsDNA antibodies, complement consumption and triple ANCA positivity. A first kidney biopsy done at presentation highlighted class IV-G glomerulonephritis with elective extra-capillary involvement and mainly C1q glomerular deposition at immunofluorescence study. After three months of a regimen combining steroids and cyclophosphamide, a second biopsy was performed and showed class IV-G glomerulonephritis with mainly endocapillary proliferation. CONCLUSION: This case is atypical in view of immunological profile and kidney histopathological presentation and evolution and gives rise to discussion in view of recent data on ANCA value in lupus nephritis, and suggests that different auto-immune pathways may be involved in lupus nephritis.


Asunto(s)
Lesión Renal Aguda/diagnóstico , Lesión Renal Aguda/inmunología , Vasculitis Asociada a Anticuerpos Citoplasmáticos Antineutrófilos/diagnóstico , Vasculitis Asociada a Anticuerpos Citoplasmáticos Antineutrófilos/inmunología , Nefritis Lúpica/diagnóstico , Nefritis Lúpica/inmunología , Lesión Renal Aguda/patología , Vasculitis Asociada a Anticuerpos Citoplasmáticos Antineutrófilos/patología , Diagnóstico Diferencial , Femenino , Humanos , Nefritis Lúpica/patología , Persona de Mediana Edad
6.
Front Pharmacol ; 10: 378, 2019.
Artículo en Inglés | MEDLINE | ID: mdl-31031626

RESUMEN

Mycobacterium ulcerans is the bacillus responsible for Buruli ulcer, an infectious disease and the third most important mycobacterial disease worldwide, after tuberculosis and leprosy. M. ulcerans infection is a type of panniculitis beginning mostly with a nodule or an oedema, which can progress to large ulcerative lesions. The lesions are caused by mycolactone, the polyketide toxin of M. ulcerans. Mycolactone plays a central role for host colonization as it has immunomodulatory and analgesic effects. On one hand, mycolactone induces analgesia by targeting type-2 angiotensin II receptors (AT2R), causing cellular hyperpolarization and neuron desensitization. Indeed, a single subcutaneous injection of mycolactone into the mouse footpad induces a long-lasting hypoesthesia up to 48 h. It was suggested that the long-lasting hypoesthesia may result from the persistence of a significant amount of mycolactone locally following its injection, which could be probably due to its slow elimination from tissues. To verify this hypothesis, we investigated the correlation between hypoesthesia and mycolactone bioavailability directly at the tissue level. Various quantities of mycolactone were then injected in mouse tissue and hypoesthesia was recorded with nociception assays over a period of 48 h. The hypoesthesia was maximal 6 h after the injection of 4 µg mycolactone. The basal state was reached 48 h after injection, which demonstrated the absence of nerve damage. Surprisingly, mycolactone levels decreased strongly during the first hours with a reduction of 70 and 90% after 4 and 10 h, respectively. Also, mycolactone did not diffuse in neighboring skin tissue and only poorly into the bloodstream upon direct injection. Nevertheless, the remaining amount was sufficient to induce hypoesthesia during 24 h. Our results thus demonstrate that intact mycolactone is rapidly eliminated and that very small amounts of mycolactone are sufficient to induce hypoesthesia. Taken together, our study points out that mycolactone ought to be considered as a promising analgesic.

7.
PLoS One ; 14(3): e0214321, 2019.
Artículo en Inglés | MEDLINE | ID: mdl-30925186

RESUMEN

BACKGROUND: Biological biomarkers to stratify cancer risk before kidney transplantation are lacking. Several data support that tumor development and growth is associated with a tolerant immune profile. T cells expressing low levels of CD45RC preferentially secrete regulatory cytokines and contain regulatory T cell subset. In contrast, T cells expressing high levels of CD45RC have been shown to secrete proinflammatory cytokines, to drive alloreactivity and to predict acute rejection (AR) in kidney transplant patients. In the present work, we evaluated whether pre-transplant CD45RClow T cell subset was predictive of post-transplant cancer occurrence. METHODS: We performed an observational cohort study of 89 consecutive first time kidney transplant patients whose CD45RC T cell expression was determined by flow cytometry before transplantation. Post-transplant events including cancer, AR, and death were assessed retrospectively. RESULTS: After a mean follow-up of 11.1±4.1 years, cancer occurred in 25 patients (28.1%) and was associated with a decreased pre-transplant proportion of CD4+CD45RChigh T cells, with a frequency below 51.9% conferring a 3.7-fold increased risk of post-transplant malignancy (HR 3.71 [1.24-11.1], p = 0.019). The sensibility, specificity, negative predictive and positive predictive values of CD4+CD45RChigh<51.9% were 84.0, 54.7, 89.8 and 42.0% respectively. Confirming our previous results, frequency of CD8+CD45RChigh T cells above 52.1% was associated with AR, conferring a 20-fold increased risk (HR 21.7 [2.67-176.2], p = 0.0004). The sensibility, specificity, negative predictive and positive predictive values of CD8+CD45RChigh>52.1% were 94.5, 68.0, 34.7 and 98.6% respectively. Frequency of CD4+CD45RChigh T cells was positively correlated with those of CD8+CD45RChigh (p<0.0001), suggesting that recipients with high AR risk display a low cancer risk. CONCLUSION: High frequency of CD45RChigh T cells was associated with AR, while low frequency was associated with cancer. Thus, CD45RC expression on T cells appears as a double-edged sword biomarker of promising interest to assess both cancer and AR risk before kidney transplantation.


Asunto(s)
Rechazo de Injerto/inmunología , Antígenos Comunes de Leucocito/metabolismo , Neoplasias/complicaciones , Linfocitos T/citología , Adulto , Diferenciación Celular , Estudios de Cohortes , Citocinas/metabolismo , Femenino , Humanos , Trasplante de Riñón , Masculino , Persona de Mediana Edad , Neoplasias/inmunología , Estudios Retrospectivos , Linfocitos T/inmunología
9.
Sci Rep ; 7(1): 5390, 2017 07 14.
Artículo en Inglés | MEDLINE | ID: mdl-28710351

RESUMEN

Tuberculosis (TB) is a leading infectious cause of death worldwide. The use of ethionamide (ETH), a main second line anti-TB drug, is hampered by its severe side effects. Recently discovered "booster" molecules strongly increase the ETH efficacy, opening new perspectives to improve the current clinical outcome of drug-resistant TB. To investigate the simultaneous delivery of ETH and its booster BDM41906 in the lungs, we co-encapsulated these compounds in biodegradable polymeric nanoparticles (NPs), overcoming the bottlenecks inherent to the strong tendency of ETH to crystallize and the limited water solubility of this Booster. The efficacy of the designed formulations was evaluated in TB infected macrophages using an automated confocal high-content screening platform, showing that the drugs maintained their activity after incorporation in NPs. Among tested formulations, "green" ß-cyclodextrin (pCD) based NPs displayed the best physico-chemical characteristics and were selected for in vivo studies. The NPs suspension, administered directly into mouse lungs using a Microsprayer®, was proved to be well-tolerated and led to a 3-log decrease of the pulmonary mycobacterial load after 6 administrations as compared to untreated mice. This study paves the way for a future use of pCD NPs for the pulmonary delivery of the [ETH:Booster] pair in TB chemotherapy.


Asunto(s)
Antituberculosos/farmacología , Quimioterapia Combinada/métodos , Etionamida/farmacología , Mycobacterium tuberculosis/efectos de los fármacos , Oxadiazoles/farmacología , Piperidinas/farmacología , Tuberculosis Resistente a Múltiples Medicamentos/tratamiento farmacológico , Tuberculosis Pulmonar/tratamiento farmacológico , Administración por Inhalación , Animales , Modelos Animales de Enfermedad , Portadores de Fármacos , Composición de Medicamentos/métodos , Sinergismo Farmacológico , Femenino , Humanos , Ratones , Ratones Endogámicos BALB C , Mycobacterium tuberculosis/crecimiento & desarrollo , Mycobacterium tuberculosis/patogenicidad , Nanopartículas/administración & dosificación , Nanopartículas/química , Copolímero de Ácido Poliláctico-Ácido Poliglicólico/química , Células RAW 264.7 , Solubilidad , Resultado del Tratamiento , Tuberculosis Resistente a Múltiples Medicamentos/microbiología , Tuberculosis Resistente a Múltiples Medicamentos/patología , Tuberculosis Pulmonar/microbiología , Tuberculosis Pulmonar/patología , beta-Ciclodextrinas/química
10.
Presse Med ; 45(5): 483-94, 2016 May.
Artículo en Francés | MEDLINE | ID: mdl-27156971

RESUMEN

CONTEXT: The number of applicants to medical school exceeds the number of places available, a situation that questions the effectiveness and relevance of medical student assessment and selection. OBJECTIVES: The objective of this review of the literature was to analyze in a systematic way the studies looking for an association between results of an admission procedure and a later evaluation of the characteristics of the students or the doctors that they became. DOCUMENTARY SOURCES (KEY WORDS AND LANGUAGE): MedLine, Web of Science and Cochrane Library. The articles written in English were selected. The keywords were: "medical school"; "student admissions"; "student selection"; "predictive validity"; "student performance"; "interview"; "MCAT" (Medical College Admission Test); "MMI" (Mini Mental Interview). RESULTS: Of the 1116 listed publications, 22 were analyzed. Criteria assessed at the admission (standardized written tests, evaluation of personality and social skills, academic evaluation, demographic characteristics) were confronted with the criteria measured during the follow-up (academic or clinical evaluations). The previous academic results and the standardized written tests seem associated to academic success in medical school. CONCLUSION: The actual selection methods used in our French medical universities are very different from those described in international literature. It is difficult to clearly define factors associated with success during student selection as there is a great diversity of cultures and methods involved.


Asunto(s)
Criterios de Admisión Escolar , Facultades de Medicina , Predicción , Francia
11.
Lancet Glob Health ; 2(7): e422-30, 2014 Jul.
Artículo en Inglés | MEDLINE | ID: mdl-25103396

RESUMEN

BACKGROUND: Buruli ulcer, caused by Mycobacterium ulcerans, was identified as a neglected emerging infectious disease by WHO in 1998. Although Buruli ulcer is the third most common mycobacterial disease worldwide, understanding of the disease is incomplete. We analysed a large cohort of laboratory-confirmed cases of Buruli ulcer from Pobè, Benin, to provide a comprehensive description of the clinical presentation of the disease, its variation with age and sex, and its effect on the occurrence of permanent functional sequelae. METHODS: Between Jan 1, 2005, and Dec 31, 2011, we prospectively collected clinical and laboratory data from all patients with Buruli ulcer diagnosed at the Centre de Dépistage et de Traitement de l'Ulcère de Buruli in Pobè, Benin. We followed up patients to assess the frequency of permanent functional sequelae. All analyses were done on cases that were laboratory confirmed. FINDINGS: 1227 cases of laboratory-confirmed Buruli ulcer were included in the analysis. Typically, patients with Buruli ulcer were children (median age at diagnosis 12 years) presenting with a unique (1172 [96%]) large (≥15 cm, 444 [36%]) ulcerative (805 [66%]) lesion of the lower limb (733 [60%]). Atypical clinical presentation of Buruli ulcer included Buruli ulcer osteomyelitis with no identifiable present or past Buruli ulcer skin lesions, which was recorded in at least 14 patients. The sex ratio of Buruli ulcer widely varied with age, with male patients accounting for 57% (n=427) of patients aged 15 years and younger, but only 33% (n=158) of those older than 15 years (odds ratio [OR] 2·59, 95% CI 2·04-3·30). Clinical presentation of Buruli ulcer was significantly dependent on age and sex. 54 (9%) male patients had Buruli ulcer osteomyelitis, whereas only 28 (4%) of female patients did (OR 2·21, 95% CI 1·39-3·59). 1 year after treatment, 229 (22% of 1043 with follow-up information) patients presented with permanent functional sequelae. Presentation with oedema, osteomyelitis, or large (≥15 cm in diameter), or multifocal lesions was significantly associated with occurrence of permanent functional sequelae (OR 7·64, 95% CI 5·29-11·31) and operationally defines severe Buruli ulcer. INTERPRETATION: Our findings have important clinical implications for daily practice, including enhanced surveillance for early detection of osteomyelitis in boys; systematic search for M ulcerans in osteomyelitis cases of non-specific aspect in areas endemic for Buruli ulcer; and specific disability prevention for patients presenting with osteomyelitis, oedema, or multifocal or large lesions. Our findings also suggest a crucial underestimation of the burden of Buruli ulcer in Africa and raise key questions about the contribution of environmental and physiopathological factors to the recorded heterogeneity of the clinical presentation of Buruli ulcer. FUNDING: Agence Nationale de la Recherche (ANR), Fondation Raoul Follereau, Fondation pour la Recherche Médicale (FRM), and Institut des Maladies Génétiques (IMAGINE).


Asunto(s)
Úlcera de Buruli/epidemiología , Adolescente , Adulto , Distribución por Edad , Benin/epidemiología , Úlcera de Buruli/sangre , Úlcera de Buruli/diagnóstico , Causalidad , Niño , Estudios de Cohortes , Comorbilidad , Edema/sangre , Edema/diagnóstico , Edema/epidemiología , Femenino , Estudios de Seguimiento , Humanos , Masculino , Osteomielitis/sangre , Osteomielitis/diagnóstico , Osteomielitis/epidemiología , Estudios Prospectivos , Distribución por Sexo , Adulto Joven
12.
Cell ; 157(7): 1565-76, 2014 Jun 19.
Artículo en Inglés | MEDLINE | ID: mdl-24949969

RESUMEN

Mycobacterium ulcerans, the etiological agent of Buruli ulcer, causes extensive skin lesions, which despite their severity are not accompanied by pain. It was previously thought that this remarkable analgesia is ensured by direct nerve cell destruction. We demonstrate here that M. ulcerans-induced hypoesthesia is instead achieved through a specific neurological pathway triggered by the secreted mycobacterial polyketide mycolactone. We decipher this pathway at the molecular level, showing that mycolactone elicits signaling through type 2 angiotensin II receptors (AT2Rs), leading to potassium-dependent hyperpolarization of neurons. We further validate the physiological relevance of this mechanism with in vivo studies of pain sensitivity in mice infected with M. ulcerans, following the disruption of the identified pathway. Our findings shed new light on molecular mechanisms evolved by natural systems for the induction of very effective analgesia, opening up the prospect of new families of analgesics derived from such systems.


Asunto(s)
Angiotensinas/metabolismo , Úlcera de Buruli/patología , Macrólidos/aislamiento & purificación , Mycobacterium ulcerans , Analgésicos/aislamiento & purificación , Animales , Úlcera de Buruli/metabolismo , Úlcera de Buruli/microbiología , Modelos Animales de Enfermedad , Edema/microbiología , Humanos , Hipoestesia/inducido químicamente , Macrólidos/química , Macrólidos/metabolismo , Ratones , Neuronas/metabolismo , Canales de Potasio/metabolismo , Prostaglandina-Endoperóxido Sintasas/metabolismo , Receptor de Angiotensina Tipo 2/metabolismo , Transducción de Señal/efectos de los fármacos
13.
J Pharmacol Exp Ther ; 345(2): 198-205, 2013 May.
Artículo en Inglés | MEDLINE | ID: mdl-23426955

RESUMEN

Scedosporium apiospermum is a soil fungus which can cause severe and often fatal cerebral infections in both immunocompetent patients in the event of near drowning and immunosuppressed patients such as lung transplant recipients. Because of the low susceptibility of this fungus to antifungal drugs, and the low permeability of the blood-brain barrier (BBB), therapeutic drug monitoring is necessary to reach an effective tissue concentration with limited side effects. Indeed, diffusion of the drug in the brain is dependent on several parameters, such as the integrity of the BBB and the activity of efflux pumps. To evaluate drug diffusion, two experimental models were developed in immunocompetent and immunosuppressed rats. Inocula were administered via the penile vein and a clinical scale (0-9) was established, based on weight and clinical and neurologic signs evaluated by the tail suspension test. Cerebral involvement was confirmed by magnetic resonance imaging and histologic examination of brain sections after hematoxylin-eosin-safran or silver staining. Voriconazole or posaconazole was given to the rats at doses ranging from 10 to 75 mg/kg/day via i.v. or oral routes, respectively. Whatever the immune status, the effective doses (defined by a doubling of the survival time and the absence of neurologic sequelae) were 30 mg/kg/day for voriconazole and 50 mg/kg/day for posaconazole. Overall, the results demonstrated that these models may constitute valuable tools for the performance of pharmacokinetic and pharmacodynamic studies for pharmacokinetic-pharmacodynamic modeling.


Asunto(s)
Antifúngicos/uso terapéutico , Infecciones Fúngicas del Sistema Nervioso Central/patología , Scedosporium , Animales , Antifúngicos/administración & dosificación , Antifúngicos/farmacocinética , Barrera Hematoencefálica/patología , Encéfalo/microbiología , Encéfalo/patología , Infecciones Fúngicas del Sistema Nervioso Central/tratamiento farmacológico , Infecciones Fúngicas del Sistema Nervioso Central/microbiología , Modelos Animales de Enfermedad , Relación Dosis-Respuesta a Droga , Huésped Inmunocomprometido , Imagen por Resonancia Magnética , Masculino , Pirimidinas/administración & dosificación , Pirimidinas/farmacocinética , Pirimidinas/uso terapéutico , Ratas , Ratas Sprague-Dawley , Análisis de Supervivencia , Triazoles/administración & dosificación , Triazoles/farmacocinética , Triazoles/uso terapéutico , Voriconazol
14.
Eur J Gastroenterol Hepatol ; 24(12): 1430-7, 2012 Dec.
Artículo en Inglés | MEDLINE | ID: mdl-23114745

RESUMEN

OBJECTIVE: Neuroendocrine carcinomas (NECs) are rare neoplasms with an increasing incidence. Oncogenetic pathways of colorectal NEC are still poorly understood, and no treatment standards are available for these rare tumors. METHODS: We analyzed retrospectively the clinical records and histology of 12 patients with colorectal NEC. KRAS and BRAF mutations were investigated after the dissection of exoendocrine and neuroendocrine components. ALK alterations and EML4-ALK transcripts were detected by in-situ hybridization and determination of fusion transcripts, respectively. RESULTS: At the time of diagnosis, the mean age of the patients was 60 years (40-79) and 10 patients had synchronous metastases. A transient response occurred in two patients and one patient treated with cisplatin-etoposide or fluoropyrimidine-oxaliplatin, respectively. Tumor progression-related death occurred in 11 of 12 patients. Ten tumors contained an exocrine component, accounting for 5-70% of the tumor, and the other two contained an amphicrine component. BRAF/KRAS mutations were found in six of 10 tumors, corresponding to BRAF(V600E) (n=2) or KRAS(G12D) (n=2), KRAS(G12V) or KRAS(G13D). DNA was obtained from both exocrine and endocrine components in seven cases, and the BRAF/KRAS status was identical in all cases. Split of the ALK locus was detected in a minority of tumor cells in two of eight cases, but EML4-ALK transcripts were absent. CONCLUSION: The association of an exocrine component in all cases and the similar profile of BRAF/KRAS mutations indicate that colorectal NEC may correspond to a high-grade transformation of colorectal carcinoma. New chemotherapy regimens using targeted therapies should be assessed in these tumors.


Asunto(s)
Adenocarcinoma/genética , Adenoma/genética , Carcinoma Neuroendocrino/genética , Neoplasias Colorrectales/genética , Mutación , Proteínas de Fusión Oncogénica/genética , Proteínas Proto-Oncogénicas B-raf/genética , Proteínas Proto-Oncogénicas/genética , Proteínas ras/genética , Adenocarcinoma/tratamiento farmacológico , Adenocarcinoma/mortalidad , Adenocarcinoma/secundario , Adenoma/tratamiento farmacológico , Adenoma/mortalidad , Adenoma/patología , Adulto , Anciano , Protocolos de Quimioterapia Combinada Antineoplásica/uso terapéutico , Carcinoma Neuroendocrino/tratamiento farmacológico , Carcinoma Neuroendocrino/mortalidad , Carcinoma Neuroendocrino/secundario , Neoplasias Colorrectales/tratamiento farmacológico , Neoplasias Colorrectales/mortalidad , Neoplasias Colorrectales/patología , Análisis Mutacional de ADN , Progresión de la Enfermedad , Femenino , Predisposición Genética a la Enfermedad , Humanos , Hibridación in Situ , Masculino , Persona de Mediana Edad , Fenotipo , Proteínas Proto-Oncogénicas p21(ras) , ARN Mensajero/análisis , Estudios Retrospectivos , Factores de Tiempo , Resultado del Tratamiento
15.
PLoS Biol ; 10(9): e1001395, 2012.
Artículo en Inglés | MEDLINE | ID: mdl-23055831

RESUMEN

Interleukin-26 (IL-26), a member of the IL-10 cytokine family, induces the production of proinflammatory cytokines by epithelial cells. IL-26 has been also reported overexpressed in Crohn's disease, suggesting that it may be involved in the physiopathology of chronic inflammatory disorders. Here, we have analyzed the expression and role of IL-26 in rheumatoid arthritis (RA), a chronic inflammatory disorder characterized by joint synovial inflammation. We report that the concentrations of IL-26 are higher in the serums of RA patients than of healthy subjects and dramatically elevated in RA synovial fluids compared to RA serums. Immunohistochemistry reveals that synoviolin(+) fibroblast-like synoviocytes and CD68(+) macrophage-like synoviocytes are the main IL-26-producing cells in RA joints. Fibroblast-like synoviocytes from RA patients constitutively produce IL-26 and this production is upregulated by IL-1-beta and IL-17A. We have therefore investigated the role of IL-26 in the inflammatory process. Results show that IL-26 induces the production of the proinflammatory cytokines IL-1-beta, IL-6, and tumor necrosis factor (TNF)-alpha by human monocytes and also upregulates the expression of numerous chemokines (mainly CCL20). Interestingly, IL-26-stimulated monocytes selectively promote the generation of RORgamma t(+) Th17 cells, through IL-1-beta secretion by monocytes. More precisely, IL-26-stimulated monocytes switch non-Th17 committed (IL-23R(-) or CCR6(-) CD161(-)) CD4(+) memory T cells into Th17 cells. Finally, synovial fluids from RA patients also induce Th17 cell generation and this effect is reduced after IL-26 depletion. These findings show that IL-26 is constitutively produced by RA synoviocytes, induces proinflammatory cytokine secretion by myeloid cells, and favors Th17 cell generation. IL-26 thereby appears as a novel proinflammatory cytokine, located upstream of the proinflammatory cascade, that may constitute a promising target to treat RA and chronic inflammatory disorders.


Asunto(s)
Artritis Reumatoide/inmunología , Artritis Reumatoide/patología , Citocinas/biosíntesis , Mediadores de Inflamación/metabolismo , Interleucinas/metabolismo , Células Th17/inmunología , Artritis Reumatoide/sangre , Citocinas/metabolismo , Demografía , Femenino , Fibroblastos/inmunología , Fibroblastos/patología , Humanos , Inmunohistoquímica , Memoria Inmunológica , Interleucina-17/metabolismo , Interleucina-1beta/metabolismo , Interleucinas/sangre , Articulaciones/inmunología , Articulaciones/patología , Masculino , Persona de Mediana Edad , Modelos Inmunológicos , Monocitos/metabolismo , Células Mieloides/metabolismo , Líquido Sinovial/metabolismo , Membrana Sinovial/metabolismo , Membrana Sinovial/patología
17.
Presse Med ; 41(5): e213-9, 2012 May.
Artículo en Francés | MEDLINE | ID: mdl-22336485

RESUMEN

INTRODUCTION: The activity of scientific publication after initial medical education is unclear. The purpose of this study was to evaluate the proportion of MD theses and Board certification manuscripts resulting in a publication, their impact in terms of SIGAPS points and the main difficulties in the publication of this work. METHODS: MD theses sustained from 2002 to 2008 at the Faculty of Medicine of Angers have been identified from the "Système universitaire de documentation" (SUDOC), catalog, and specialty certification manuscripts (Board and Complementary Board) directly to diplomates. Publications were searched in Medline via Pubmed, ISI Web of Knowledge and in the three SIGAPS reports from 2002 to 2008. A survey aimed at determining the barriers to publication and the way to suppress them was launched to all MD directors and specialty mentors. RESULTS: Five hundred and ninety-eight theses were sustained, 311 (52%) in general medicine and 287 (48%) in specialties. One hundred and sixty-five theses have resulted in publication (28%) of which 97 (16%) indexed in Medline via Pubmed (11% in general medicine and 22% in specialty). Thirty-three of these 97 articles (35%) were published in journals of high quality classes A, B or C of SIGAPS classification. These articles from theses represented 4.17% of the SIGAPS scoring of the hospital calculated on a total of 2088 articles over this period. Two hundred and four specialty certification manuscripts resulted in 69 articles (33.8%), 50 (24.5%) indexed in Medline. The rate of publication of these specialty manuscripts, Board and Complementary Board, were respectively 31% (45/145) and 40.7% (24/59). They represented 1.9% (432 points) total SIGAPS score. The main barriers to publication were lack of time of directors, remote students after the promotion and the lack of logistic resources. CONCLUSION: Scientific publications issued from initial medical education at the Faculty of Medicine of Angers was of good quality but quantitatively insufficient, and contributed poorly to the University Hospital funding despite a significant number of diplomates. Logistical support should be considered in order to promote scientific production after initial medical education.


Asunto(s)
Bibliometría , Educación Médica/estadística & datos numéricos , Docentes Médicos/estadística & datos numéricos , Ciencia del Laboratorio Clínico , Edición/estadística & datos numéricos , Certificación , Educación Médica/normas , Evaluación Educacional/normas , Evaluación Educacional/estadística & datos numéricos , Docentes Médicos/normas , Francia , Humanos , Ciencia del Laboratorio Clínico/normas , Ciencia del Laboratorio Clínico/estadística & datos numéricos , Medicina/organización & administración , Medicina/estadística & datos numéricos , Publicaciones/estadística & datos numéricos , Edición/normas , Mejoramiento de la Calidad , Informe de Investigación/normas , Factores de Tiempo
19.
Presse Med ; 40(10): e471-6, 2011 Oct.
Artículo en Francés | MEDLINE | ID: mdl-21676576

RESUMEN

OBJECTIVES: To describe the level of English of a population of medical students and the improvement after the implementation of systematic assessment that all students achieve a minimal level. POPULATION AND METHODS: For the past 5 years, all medical students in our medical school have been taking the Test of English for International Communication (TOEIC). The baseline population (students entering second year in 2004) had no specific obligation. After 2004, a score above 600 was mandatory for graduation. Teaching was oriented towards training for the TOEIC and the number of hours was more important for low-level students. RESULTS: The mean score has increased from 618 ± 146 in 2004, to 687 ± 94, 717 ± 97, 733 ± 96 and 731 ± 104 for the next four years. The proportion of students who do not achieve a score of 550 (B1 level of the European framework) has decreased from 30 to 0%. DISCUSSION: Improving the level of English of French medical students is possible, if this is made a priority. The objective, as set in engineering studies, that all medical students reach a B2 level would require national guidelines.


Asunto(s)
Comunicación , Lenguaje , Estudiantes de Medicina , Francia
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