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Investigating the functionalization of liposomes with NFL-TBS. 40-63 peptide as a promising drug delivery system. Int J Pharm 2024; 652:123805. [PMID: 38237710 DOI: 10.1016/j.ijpharm.2024.123805] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2023] [Revised: 12/23/2023] [Accepted: 01/11/2024] [Indexed: 02/02/2024]
Abstract
The NFL-peptide was discovered almost 20 years ago, and its targeting properties were assessed alone or in combination with lipid nanocapsules (LNC), magnetic porous silicon nanorods, or gold nanoparticles. Results highlighted a better targeting of cancer cells, in particular glioblastoma and pancreas cancer. Considering the large use of liposomes (LPs) as an hydrophilic drug delivery system, this study explored the possibility to functionalize liposomes with three different sequences of NFL-peptides: native (NFL-peptide), biotinylated (BIOT-NFL) and coupled to fluorescein (FAM-NFL). Dynamic Light Scattering (DLS) complemented by cryo-electron microscopy (CEM) showed a peculiar ultrastructural arrangement between NFL-peptides and liposomes. Based on this architectural interaction, we investigated the biological contribution of these peptides in LPs-DiD glioblastoma cellular uptake. Flow cytometry complemented by confocal microscopy experiments demonstrated a consequent and systematic increased uptake of LPs-DiD into F98 cells when their surface was decorated with NFL-peptides. The intra-cellular distribution of these liposomes via an organelle tracker indicated the presence of LPs-DiD in lysosomes after 4 h. Based on the properties of this NFL-peptide, we showed in this work the crucial role of NFL peptide as an effective and promising actor to potentiate nanoparticles entry in glioblastoma cell lines.
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A Nano-Based Approach to Deliver Satureja thymbra Essential Oil to the Skin: Formulation and Characterization. Molecules 2024; 29:1041. [PMID: 38474551 DOI: 10.3390/molecules29051041] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2024] [Revised: 02/23/2024] [Accepted: 02/26/2024] [Indexed: 03/14/2024] Open
Abstract
Essential oils are well known for their biological properties, making them useful for the treatment of various diseases. However, because of their poor stability and high volatility, their potential cannot be fully exploited. The use of nanoformulations to deliver essential oils can solve these critical issues and amplify their biological activities. We characterized an essential oil from Satureja thymbra via GC-MS and HPLC-DAD to provide qualitative and quantitative data. The essential oil was formulated in phospholipid vesicles which were characterized for size, surface charge, and storage stability. The entrapment efficiency was evaluated as the quantification of the major monoterpenoid phenols via HPLC-DAD. The morphological characterization of the vesicles was carried out via cryo-TEM and SAXS analyses. The essential oil's antioxidant potential was assayed via two colorimetric tests (DPPH• and FRAP) and its cytocompatibility was evaluated in HaCaT skin cell cultures. The results showed that the nanoformulations developed for the loading of S. thymbra essential oil were below 100 nm in size, predominantly unilamellar, stable in storage, and had high entrapment efficiencies. The vesicles also displayed antioxidant properties and high cytocompatibility. These promising findings pave the way for further investigation of the therapeutic potential of S. thymbra nanoformulations upon skin application.
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Cardiac features of MIS-C: MRI and Speckle-tracking data. ARCHIVES OF CARDIOVASCULAR DISEASES SUPPLEMENTS 2023. [PMCID: PMC9800770 DOI: 10.1016/j.acvdsp.2022.10.278] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Introduction In November 2019, the first case of SARS-CoV-2 infection was reported in China, the first European case was declared 2 months later in January 2020. While the pediatric population seemed to be less affected by SARS-CoV-2, an alert was launched in April 2020 following multiple cases of multisystem inflammatory syndrome in children (MIS-C), secondary to SARS-CoV-2 infection. The presentation shares clinical features with Kawasaki disease but involves almost systematically cardiac dysfunction. Cardiac involvement is central in MIS-C and represents the main cause of morbidity. Objective In this study, we therefore aimed to assess the myocardial damage in patients with MIS-C using MRI during the acute phase as well as left ventricular and atrial longitudinal strain during the acute phase and after recovery. Method We performed a single-center prospective cohort and case-control study. Between September 2020 and January 2022, we included 39 patients hospitalized for MIS-C in our center. We performed left ventricular and atrial longitudinal 2D strain analysis on admission and during follow-up; the analysis was compared to a matched control population. Patients above 4 years old with increased troponin underwent cardiac MRI. Results Of 22 patients who underwent cardiac MRI, 14 (64%) presented myocardial edema and 6 (27%) late gadolinium enhancement, the latter being associated with myopericarditis and impaired LVEF (P < 0.001), older patients (P = 0.027) and elevated ferritin (P = 0.03). We found a decrease in left ventricular and atrial longitudinal strain on admission as compared to controls with a significant improvement at 1 month post-discharge (P < 0.0001). The alteration in LV strain persisted beyond one month according the comparison with the control population (P = 0.01). Conclusion Only little is known about the long-term follow-up and prognosis in MIS-C patients. Our study demonstrated the myocardial inflammation during the acute phase of MIS-C as well as the impaired LA and LV myocardial deformation that persists for at least several weeks after the acute phase. Thus, we believe MRI and LV/LA strain could help us individualize our MIS-C patients follow-up.
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Investigation on the self-assembly of the NFL-TBS.40-63 peptide and its interaction with gold nanoparticles as a delivery agent for glioblastoma. Int J Pharm X 2022; 4:100128. [PMID: 36204592 PMCID: PMC9529584 DOI: 10.1016/j.ijpx.2022.100128] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2022] [Accepted: 08/30/2022] [Indexed: 11/19/2022] Open
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Encapsulation of Luminescent Gold Nanoclusters into Synthetic Vesicles. NANOMATERIALS (BASEL, SWITZERLAND) 2022; 12:nano12213875. [PMID: 36364651 PMCID: PMC9655092 DOI: 10.3390/nano12213875] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/06/2022] [Revised: 10/24/2022] [Accepted: 10/26/2022] [Indexed: 06/02/2023]
Abstract
Gold nanoclusters (Au NCs) are attractive luminescent nanoprobes for biomedical applications. In vivo biosensing and bioimaging requires the delivery of the Au NCs into subcellular compartments. In this view, we explore here the possible encapsulation of ultra-small-sized red and blue emitting Au NCs into liposomes of various sizes and chemical compositions. Different methods were investigated to prepare vesicles containing Au NCs in their lumen. The efficiency of the process was correlated to the structural and morphological aspect of the Au NCs' encapsulating vesicles thanks to complementary analyses by SAXS, cryo-TEM, and confocal microscopy techniques. Cell-like-sized vesicles (GUVs) encapsulating red or blue Au NCs were successfully obtained by an innovative method using emulsion phase transfer. Furthermore, exosome-like-sized vesicles (LUVs) containing Au NCs were obtained with an encapsulation yield of 40%, as estimated from ICP-MS.
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Inhibition of the pseudokinase MLKL alters extracellular vesicle release and reduces tumor growth in glioblastoma. iScience 2022; 25:105118. [PMID: 36185361 PMCID: PMC9519628 DOI: 10.1016/j.isci.2022.105118] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2022] [Revised: 08/04/2022] [Accepted: 09/08/2022] [Indexed: 11/25/2022] Open
Abstract
Extracellular vesicles (EVs) are lipid-based nanosized particles that convey biological material from donor to recipient cells. EVs play key roles in glioblastoma progression because glioblastoma stem-like cells (GSCs) release pro-oncogenic, pro-angiogenic, and pro-inflammatory EVs. However, the molecular basis of EV release remains poorly understood. Here, we report the identification of the pseudokinase MLKL, a crucial effector of cell death by necroptosis, as a regulator of the constitutive secretion of EVs in GSCs. We find that genetic, protein, and pharmacological targeting of MLKL alters intracellular trafficking and EV release, and reduces GSC expansion. Nevertheless, this function ascribed to MLKL appears independent of its role during necroptosis. In vivo, pharmacological inhibition of MLKL reduces the tumor burden and the level of plasmatic EVs. This work highlights the necroptosis-independent role of MLKL in vesicle release and suggests that interfering with EVs is a promising therapeutic option to sensitize glioblastoma cells. The pseudokinase MLKL governs extracellular vesicle release in glioblastoma cells Blocking MLKL is deleterious to glioblastoma cell expansion in vitro and in vivo MLKL action in glioblastoma patient cells does not involve necroptosis death MLKL inhibition potentiates TMZ-induced cell death in glioblastoma patient cells
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Abstract
According to their high electron density and ultrasmall size, gold nanoclusters (AuNCs) have unique luminescence and photoelectrochemical properties that make them very attractive for various biomedical fields. These applications require a clear understanding of their interaction with biological membranes. Here we demonstrate the ability of the AuNCs as markers for lipidic bilayer structures such as synthetic liposomes and biological extracellular vesicles (EVs). The AuNCs can selectively interact with liposomes or EVs through an attractive electrostatic interaction as demonstrated by zetametry and fluorescence microscopy. According to the ratio of nanoclusters to vesicles, the lipidic membranes can be fluorescently labeled without altering their thickness until charge reversion, the AuNCs being located at the level of the phosphate headgroups. In presence of an excess of AuNCs, the vesicles tend to adhere and aggregate. The strong adsorption of AuNCs results in the formation of a lamellar phase as demonstrated by cryo-transmission electron microscopy and small-angle X-ray scattering techniques.
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Patients asthmatiques hospitalisés pour infection à SARS-CoV-2 ou pour grippe : facteurs de risques de mauvais pronostic. Rev Epidemiol Sante Publique 2022. [PMCID: PMC9059286 DOI: 10.1016/j.respe.2022.03.038] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
Introduction Lors de l’émergence du coronavirus SARS-CoV-2, les patients asthmatiques ont été initialement considérés comme des patients à risque, comme pour les virus respiratoires et notamment celui de la grippe. Par la suite, ce surisque n'a pas été retrouvé, avec des prévalences d'asthmatiques parmi les patients hospitalisés pour Covid-19 inférieures à la prévalence de l'asthme en population générale. L'objectif de ce travail a été de comparer la prévalence de l'asthme et les facteurs de risque associés à un mauvais pronostic chez des patients asthmatiques hospitalisés pour Covid-19 ou grippe. Methodes Cette étude rétrospective a été conduite à partir des données de l'Entrepôt de Données de Santé (EDS) de l'AP-HP, regroupant les données médico-administratives des séjours hospitaliers. Les patients adultes hospitalisés entre le 01/01/2020 et le 30/06/2020 avec une PCR SARS-CoV2 positive dans les 15 jours précédents le séjour ou au cours de leur séjour ont constitué la cohorte patients Covid-19. A partir des séjours hospitaliers ayant un code CIM-10 J09, J10 ou J11, deux cohortes de patients grippe ont été construites : cohorte grippe saison 2018-2019 (séjours ente le 01/11/2018 et le 31/03/2019) et cohorte grippe saison 2017-2018 (séjours ente le 1/11/2017 et le 31/03/2018). Les antécédents d'asthme et les autres comorbidités ont été recherchés dans les codages des séjours hospitaliers grippe ou Covid-19 et antérieurs. L'obésité et tabagisme ont été également recherchés spécifiquement par REGEX dans les compte-rendu. Les facteurs associés à un passage en réanimation ou à un décès hospitalier ont été recherchés par des régression logistiques multivariées, avec une sélection pas à pas descendante sur le critère AIC. Resultats 9009 patients ont été hospitalisés à l'AP-HP pour Covid-19 entre 01/2020 et 06/2020, 3119 pour grippe pendant la saison 2017-2018, 3266 pendant le saison 2018-2019. La prévalence de l'asthme était significativement plus élevée parmi les patients hospitalisés pour grippe (n=283, 9.1%, IC95% [8.1 -10.1] en 2017-2018 et n=309, 9.5%, IC95% [8.5 - 10.5] en 2018-2019) contre 4.5% pour les patients Covid-19 (n=402, IC95% [4-4.9], p<0.001 pour les deux comparaisons). L'obésité a été retrouvée comme facteur de risque de mauvais pronostic chez les patients asthmatiques lors de la saison 2017-2018 de grippe (ORa=2.22, IC95%[1.25-3.96]), le tabagisme (ORa=2.95, IC95% [1.67- 5.39]) et l'insuffisance cardiaque pour la saison 2018-2019 (ORa= 2.05, IC95%[1.03-4.15]). Chez les asthmatiques Covid-19, le tabac et l'obésité étaient des facteurs de risque de forme grave (ORa=1.57, IC95% [1.03-2.40]) et ORa=1.55, IC95%[1.00-2.41] respectivement). Avoir plus de 70 ans (ORa=0.64 IC95%[0.42-0.97]) et le sexe féminin (ORa=0.38, IC95%[0.25-0.58]) étaient associés à un moindre risque de forme grave. Conclusion Nos résultats montrent une prévalence plus faible de l'asthme parmi les patients hospitalisés pour Covid-19 que parmi ceux hospitalisés pour grippe. Les facteurs de risque de forme grave, sauf l'obésité, diffèrent pour les 2 virus, et selon la saison grippale.Ceci pourrait être lié entre autres à une forte adhérence des patients asthmatiques aux mesures de confinement et des gestes barrières, mais également à une différence de susceptibilité aux virus respiratoires. Mots clés Covid 19 ; Asthme ; Grippe ; Mortalité ; Réanimation Déclaration de liens d'intérêts Camille Taillé déclare des rémunérations de la part de Novartis, GSK, sanofi, Astrazeneca, Chiesi, sans lien avec le travail présenté
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Transcriptomic analysis in zebrafish larvae identifies iron-dependent mitochondrial dysfunction as a possible key event of NAFLD progression induced by benzo[a]pyrene/ethanol co-exposure. Cell Biol Toxicol 2022:10.1007/s10565-022-09706-4. [PMID: 35412187 DOI: 10.1007/s10565-022-09706-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2021] [Accepted: 02/28/2022] [Indexed: 11/02/2022]
Abstract
Non-alcoholic fatty liver disease (NAFLD) is a worldwide epidemic for which environmental contaminants are increasingly recognized as important etiological factors. Among them, the combination of benzo[a]pyrene (B[a]P), a potent environmental carcinogen, with ethanol, was shown to induce the transition of steatosis toward steatohepatitis. However, the underlying mechanisms involved remain to be deciphered. In this context, we used high-fat diet fed zebrafish model, in which we previously observed progression of steatosis to a steatohepatitis-like state following a 7-day-co-exposure to 43 mM ethanol and 25 nM B[a]P. Transcriptomic analysis highlighted the potent role of mitochondrial dysfunction, alterations in heme and iron homeostasis, involvement of aryl hydrocarbon receptor (AhR) signaling, and oxidative stress. Most of these mRNA dysregulations were validated by RT-qPCR. Moreover, similar changes were observed using a human in vitro hepatocyte model, HepaRG cells. The mitochondria structural and functional alterations were confirmed by transmission electronic microscopy and Seahorse technology, respectively. Involvement of AhR signaling was evidenced by using in vivo an AhR antagonist, CH223191, and in vitro in AhR-knock-out HepaRG cells. Furthermore, as co-exposure was found to increase the levels of both heme and hemin, we investigated if mitochondrial iron could induce oxidative stress. We found that mitochondrial labile iron content was raised in toxicant-exposed larvae. This increase was prevented by the iron chelator, deferoxamine, which also inhibited liver co-exposure toxicity. Overall, these results suggest that the increase in mitochondrial iron content induced by B[a]P/ethanol co-exposure causes mitochondrial dysfunction that contributes to the pathological progression of NAFLD.
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Development and validation of a Patient-Reported Outcome in systemic sclerosis: the Hand scleroDerma lived Experience Scale (HAnDE Scale). Br J Dermatol 2021; 186:96-105. [PMID: 34355380 DOI: 10.1111/bjd.20688] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/05/2021] [Indexed: 10/20/2022]
Abstract
OBJECTIVES to develop and validate a Patient Reported Outcome (PRO) scale-the HAnDE (Hand-ScleroDerma Disease lived Experience) scale-assessing the lived experience of hand involvement in patients with systemic sclerosis (SSc). METHODS explanatory sequential mixed-method study with two phases: 1) PRO development through an Inductive Process to analyze the Structure of lived Experience approach, involving 21 SSc patients, 2) PRO validation by assessing the psychometric properties of the scale among 105 SSc patients. RESULTS 1) Phase-1 enabled to generate the 18-item provisional scale. 2) The mean total score of the scale was 29,16 (SD 16,15). The item reduction process retained 16 items with 5 levels of answers (range 0-64). Internal consistency of the 16-item version was excellent (Cronbach-alpha coefficient=0,946). Construct validity was very good, the Principal Component Analysis being in favour of a unidimensional instrument, with one factor explaining 56% of the variance, and concurrent validity being confirmed: Cochin Hand Function Scale r=0,66; Health Assessment Questionnaire-Disability index r=0.58; Hospital Anxiety Depression, anxiety r=0,51, depression r=0,4; Mouth Handicap in Systemic Sclerosis r=0,61; SF-36, physical component r=-0,48, mental component r=-0,46; and Kapandji score r=-0,46. The correlations were statistically significant (p<0,05). CONCLUSION We propose, for future trials and clinical practice in SSc, a new PRO the HAnDE scale, that assesses all the dimensions -functional, aesthetic, relational, existential, and emotional- of the lived experience of hand involvement.
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AB0401 CAN DUAL-ENERGY CT LUNG PERFUSION DETECT ABNORMALITIES AT THE LEVEL OF LUNG CIRCULATION IN SYSTEMIC SCLEROSIS (SSC)? PRELIMINARY EXPERIENCE IN 101 PATIENTS. Ann Rheum Dis 2021. [DOI: 10.1136/annrheumdis-2021-eular.69] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
Background:Systemic sclerosis (SSc) is an autoimmune disorder that is characterized by a interplay of vascular abnormalities, immune system activation and an uncontrolled fibrotic response associated with interstitial lung disease affecting about 40% of patients. Identification of ILD relies on high-resolution CT that identify features suggestive of the histologic patterns of SSc(1). CT is used to determine pattern and extent of ILD and participates in the prediction of ILD progression(2).All group of pulmonary hypertension (PH) may occur with an overall prevalence reported in up to one fifth of patient. Whereas extensive SSc-ILD can be responsible for PH, PH can also be seen as a consequence of myocardial abnormalities or as primarily affecting small pulmonary arteries and classified as pulmonary arterial hypertension.Dual-energy CT introduction offers perspectives in the evaluation of SSc-related pulmonary manifestations. While these are not strictly perfusion images, they have been reported as adequate surrogate markers of lung perfusion (3). In the field of PH, detection of perfusion defects highly concordant with V/Q scintigraphic findings has been reported in the diagnostic approach of CTEPH but also in the differential diagnosis between PAH and peripheral forms of CTEPH (4).Objectives:To investigate lung perfusion abnormalities in patients with SSc.Methods:The study population included 101 patients who underwent dual-energy CT (DECT) angiography in the follow-up of SSc. CT examinations were obtained on a 3rd-generation dual-source CT system with reconstruction of morphologic and perfusion images. All patients underwent pulmonary function tests within two months of the follow-up CT scan. Fifteen patients had right heart catheterization-proven PH.Results:Our population included patients without SSc lung involvement (Group 1; n=37), patients with SSc-related ILD (Group 2; n=56) of variable extent (Group 2a: ≤10%: n=17; Group 2b: between 11-50%: n=31; Group 2c: >50%: n=8) and patients with PVOD/PCH (Group 3; n=8). Lung perfusion was abnormal in 8 patients in G 1 (21.6%), 14 patients in G 2 (25%) and 7 patients in G 3 (87.5%). Perfusion changes were mainly composed of bilateral perfusion defects, including patchy, PE-type perfusion defects and areas of hypoperfusion of variable size. In G 1 and G 2a (n=54): (a) patients with abnormal lung perfusion (n=14) had a significantly higher proportion of NYHA III/IV scores of dyspnea (p=0.031), a shorter mean walking distance at the 6MWT (p=0.042) and a trend towards lower mean DLCO% (p=0.055) when compared to patients with normal lung perfusion (n=40); (b) a negative albeit weak correlation was found between the iodine concentration in both lungs and the DLCO% (r=-0.27; p=0.059) whereas no correlation was found with PAPs (r=0.16; p=0.29) and walking distance during the 6MWT (r=-0.029; p=0.84).Conclusion:DECT lung perfusion provides complementary information to HRCT scans, depicting perfusion changes in SSc patients with normal or minimally infiltrated lung parenchyma.References:[1]Kim EA, Lee KS, Johkoh T, Kim TS, Suh GY, Kwon OJ, et al. Interstitial lung diseases associated with collagen vascular diseases: radiologic and histopathologic findings. Radiogr Rev Publ Radiol Soc N Am Inc. 2002 Oct;22 Spec No:S151-165.[2]Goh NSL, Desai SR, Veeraraghavan S, Hansell DM, Copley SJ, Maher TM, et al. Interstitial lung disease in systemic sclerosis: a simple staging system. Am J Respir Crit Care Med. 2008 Jun 1;177(11):1248–54.[3]Fuld MK, Halaweish AF, Haynes SE, Divekar AA, Guo J, Hoffman EA. Pulmonary perfused blood volume with dual-energy CT as surrogate for pulmonary perfusion assessed with dynamic multidetector CT. Radiology. 2013 Jun;267(3):747–56.[4]Giordano J, Khung S, Duhamel A, Hossein-Foucher C, Bellèvre D, Lamblin N, et al. Lung perfusion characteristics in pulmonary arterial hypertension and peripheral forms of chronic thromboembolic pulmonary hypertension: Dual-energy CT experience in 31 patients. Eur Radiol. 2017 Apr;27(4):1631–9.Disclosure of Interests:None declared
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Phosphonodithioester-amine coupling in water: a fast reaction to modify the surface of liposomes. Org Biomol Chem 2021; 19:6392-6396. [PMID: 34223590 DOI: 10.1039/d1ob01078f] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
The incorporation of lipophilic phosphonodithioesters in phospholipid formulations generates clickable liposomes that react with amines. The kinetics of this metal free phosphonodithioester-amine coupling (PAC) on liposomes in water is reported and can be classified as a fast reaction with a second order rate constant of k ≈ 8 × 102 M-1 s-1. The PAC reaction represents a versatile strategy to functionalize liposomes.
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Loading of lutein in egg-sphingomyelin vesicles as lipid carriers: Thermotropic phase behaviour, structure of sphingosome membranes and lutein crystals. Food Res Int 2020; 138:109770. [PMID: 33292950 DOI: 10.1016/j.foodres.2020.109770] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2020] [Revised: 07/30/2020] [Accepted: 09/30/2020] [Indexed: 10/23/2022]
Abstract
Lutein is a xanthophyll carotenoid provided exclusively by the diet, that has protective functions and beneficial effects on human health. Supplementation in lutein is necessary to reach the recommended daily dietary intake. However, the introduction of lutein into foods and beverages is a real challenge since this lipophilic nutrient has a poor aqueous solubility and a low bioavailability. In this study, we investigated the capacity of egg-sphingomyelin (ESM) vesicles called sphingosomes to solubilise lutein into the bilayers. The thermal and structural properties of ESM bilayers were examined in presence of various amounts of lutein by differential scanning calorimetry (DSC) and temperature-controlled X-ray diffraction (XRD), the structures of sphingosomes and lutein crystals were observed by microscopic techniques. ESM bilayers were in the fluid Lα phase above the phase transition temperature Tm = 39.6 °C and in the lamellar ripple Pβ' phase below Tm where ESM sphingosomes exhibited ondulations and were facetted. Lutein molecules were successfully incorporated into the ESM bilayers where they induced a structural disorganisation. For ESM/lutein 90/10 %mol (91.8/8.2 %wt; 89 mg lutein / g ESM), lutein partitioning occured with the formation of lutein crystals in the aqueous phase together with lutein-loaded ESM vesicles. This study highlighted the capacity of new lipid carriers such as egg-sphingosomes to solubilise lutein and opens perspectives for the formulation of effective lutein-fortified functionnal foods and beverages providing health benefits.
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Récidive conjonctivale d’un syringocystadénocarcinome papillifère sur syndrome de Schimmelpenning associé aux mutations post-zygotiques HRAS et BRAF. Ann Dermatol Venereol 2020. [DOI: 10.1016/j.annder.2020.09.384] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Inhibiteurs acquis en facteur V : une étude multicentrique nationale de 40 cas. Rev Med Interne 2020. [DOI: 10.1016/j.revmed.2020.10.113] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Conversion d’un service de médecine interne en unité mutualisée dédiée à la gestion de cas non réanimatoires de SARS-CoV-2 au sein d’un GHU: expérience et résultats. Rev Med Interne 2020. [DOI: 10.1016/j.revmed.2020.10.366] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Extracellular vesicles released by polycyclic aromatic hydrocarbons-treated hepatocytes trigger oxidative stress in recipient hepatocytes by delivering iron. Free Radic Biol Med 2020; 160:246-262. [PMID: 32791186 DOI: 10.1016/j.freeradbiomed.2020.08.001] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/03/2020] [Revised: 07/14/2020] [Accepted: 08/01/2020] [Indexed: 12/11/2022]
Abstract
A growing body of evidences indicate the major role of extracellular vesicles (EVs) as players of cell communication in the pathogenesis of liver diseases. EVs are membrane-enclosed vesicles released by cells into the extracellular environment. Oxidative stress is also a key component of liver disease pathogenesis, but no role for hepatocyte-derived EVs has yet been described in the development of this process. Recently, some polycyclic aromatic hydrocarbons (PAHs), widespread environmental contaminants, were demonstrated to induce EV release from hepatocytes. They are also well-known to trigger oxidative stress leading to cell death. Therefore, the aim of this work was to investigate the involvement of EVs derived from PAHs-treated hepatocytes (PAH-EVs) in possible oxidative damages of healthy recipient hepatocytes, using both WIF-B9 and primary rat hepatocytes. We first showed that the release of EVs from PAHs -treated hepatocytes depended on oxidative stress. PAH-EVs were enriched in proteins related to oxidative stress such as NADPH oxidase and ferritin. They were also demonstrated to contain more iron. PAH-EVs could then induce oxidative stress in recipient hepatocytes, thereby leading to apoptosis. Mitochondria and lysosomes of recipient hepatocytes exhibited significant structural alterations. All those damages were dependent on internalization of EVs that reached lysosomes with their cargoes. Lysosomes thus appeared as critical organelles for EVs to induce apoptosis. In addition, pro-oxidant components of PAH-EVs, e.g. NADPH oxidase and iron, were revealed to be necessary for this cell death.
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Faire face au COVID-19, mise en place de novo d’une unité mutualisée « COVID-19 non réanimatoire » : organisation et résultats. Med Mal Infect 2020. [PMCID: PMC7442206 DOI: 10.1016/j.medmal.2020.06.202] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/03/2022]
Abstract
Introduction La pandémie à COVID-19 a touché presque tous les pays du monde, dont la France. Tous les départements français ont ouvert des unités dédiées pour la gestion de la phase aiguë de l’épidémie. Au sein de notre site, notre structure a été la seule à accueillir une unité pour gérer des patients confirmés COVID-19 positifs. En l’absence de soins intensifs sur place, ces patients étaient triés au SAU et ne venaient que les patients sans indication de soins intensifs en raison du bénéfice/risque attendu (âge, comorbidités). Pour activer cette unité, une équipe mutualisée a été mise en place que ce soit au niveau du personnel médical PM (seniors, internes, externes) que personnel non médical (PNM) détachés des services de médecine interne, pédiatrie, médecine du sport, consultation, endocrinologie, hépatologie de notre CHU. Un support psychologique a été proposé aux soignants et aux familles par une équipe mobile de psychiatrie. L’activité quotidienne a été réorganisée après la création de plusieurs binômes junior-senior, en service de 8 h à 19 h, 7 j/7. La continuité des soins a été assurée chaque jour par 3 staffs pour permettre respectivement les transmissions de la nuit entre PM et PNM ; l’état des lieux après la visite du matin ; les projets pour le lendemain. Tous les patients ont été réévalués chaque jour et réorientés selon une échelle de gravité structurée par 5 codes-couleurs. Les externes ont eu pour mission de contacter les familles du fait de la limitation des visites, ainsi que les médecins traitants afin d’améliorer la gestion après le RAD. Les patients ont été traités par oxygénothérapie et protocoles d’antibiothérapie et morphine. Matériels et méthodes Analyse descriptive des données personnelles, de la mortalité brute et des issues de l’hospitalisation. Résultats Entre le 13 mars et le 19 mai, 147 patients, 56 % d’eux de sexe féminin, ont été hospitalisés dans cette unité d’une capacité maximale de 25 lits. L’âge moyen était de 69 ans [18 ; 97]. La durée moyenne du séjour a été de 5 jours [0 : 29]. La mortalité totale était du 20,4 %, dont 51 % des patients sont rentrés vers leur domicile ou vers des EHPAD. Ensuite, 14,3 % des patients ont été transférés vers un autre service de médecine aiguë, et 12,2 % des patients a poursuit les soins dans un SSR. Conclusion L’organisation de ce service montre comme une équipe de PM et PNM avec fonds de travail différentes peut être rapidement mise en place pendant une période de crise. La présence d’un service dédié à la gestion des cas de COVID-19 sans indication à soins intensifs peut soulager des autres services au sein d‘un groupe hospitalier qui travaille en coordination. La mortalité des patients hospitalisés dans ce service reste baisse considérant les comorbidités et l’âge des patients. La durée courte du séjour a permis d’accueillir un grand nombre de patients et de garantir de places en médecine aiguë standard au sein du GH.
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SAT0244 PROGNOSIS OF LARGE VESSEL INVOLVEMENT IN LARGE VESSEL VASCULITIS. Ann Rheum Dis 2020. [DOI: 10.1136/annrheumdis-2020-eular.5252] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Background:Giant cell arteritis (GCA) and Takayasu arteritis (TAK) are the two main forms of large vessels vasculitis (LVV). Vessel inflammation leads to aneurysms, wall thickening, stenosis, and, in some cases, complete occlusion of the artery. Due to the wide variation in the course of LVV, predicting outcome is challenging. To our knowledge, data regarding prognosis factors of LVI in LVV patients and comparison of outcome of LVI in GCA and TAK are lacking. An early identification of patients with higher mortality could help to prevent deaths and vascular complications.Objectives:To assess prognosis factors and outcome of large vessel involvement (LVI) in large vessels vasculitis (LVV) patients.Methods:Retrospective multicenter study of characteristics and outcomes of 417 patients with LVI including 299 Takayasu arteritis (TAK) and 118 Giant cell arteritis (GCA-LVI) were analyzed. Logistic regression analysis assessed prognosis factors in LVV patients. Outcome of LVI among TAK and GCA-LVI patients (ischemic complications, aneurysms complications, relapses and revascularization) were assessed.Results:In multivariable analysis, stroke/transient ischemic attack [HR: 3.63 (1.46 - 9.04), p=0.006] was independently associated with vascular complications in LVV. The 10-years aneurysm free survival was significantly lower [67% (48 – 93) vs 89% (84 – 95), p=0.02] in GCA-LVI compare to TAK patients. The 5-years relapse free survival was significantly lower [47% (37 – 60) vs 69% (63 – 75), p<0.001,] in GCA-LVI compare to TAK patients. The 10-years revascularization free survival was significantly lower [55% (48 – 64) vs 76% (59 – 99), p<0.001] in TAK compare to GCA-LVI patients. After a median follow-up of 5 years, 16 (5.4%) TAK and 7 (5.9%) GCA-LVI patients died, mainly of aneurysm (26%) and ischemic complications (26%).Conclusion:This large nationwide cohort of LVI provided prognosis factors of vascular complications in LVV patients. TAK and GCA-LVI have different long-term outcome in term of aneurysm development, relapse and revascularization.Disclosure of Interests:None declared
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[Tick-borne relapsing fever : An unrecognized cause of fever in travellers]. Rev Med Interne 2020; 41:418-420. [PMID: 32014353 DOI: 10.1016/j.revmed.2019.12.022] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2019] [Revised: 12/01/2019] [Accepted: 12/23/2019] [Indexed: 10/25/2022]
Abstract
INTRODUCTION Tick-borne relapsing fever is a usual cause of fever in West Africa. Except relapsing febrile episodes, there are no pathognomonic signs and diagnosis is difficult because Borrelia density in patient's blood is low. CASE REPORTS Tick-borne relapsing fever was revealed by the presence of spirochetes in a blood sample to search malaria in two men, 24 and 31 year-old, returned from Mali. CONCLUSION This diagnosis should be evocated in patients having fever after a trip in infested area, as malaria, both infections can be associated.
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Control of anterior GRadient 2 (AGR2) dimerization links endoplasmic reticulum proteostasis to inflammation. EMBO Mol Med 2020; 11:emmm.201810120. [PMID: 31040128 PMCID: PMC6554669 DOI: 10.15252/emmm.201810120] [Citation(s) in RCA: 46] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
Anterior gradient 2 (AGR2) is a dimeric protein disulfide isomerase family member involved in the regulation of protein quality control in the endoplasmic reticulum (ER). Mouse AGR2 deletion increases intestinal inflammation and promotes the development of inflammatory bowel disease (IBD). Although these biological effects are well established, the underlying molecular mechanisms of AGR2 function toward inflammation remain poorly defined. Here, using a protein-protein interaction screen to identify cellular regulators of AGR2 dimerization, we unveiled specific enhancers, including TMED2, and inhibitors of AGR2 dimerization, that control AGR2 functions. We demonstrate that modulation of AGR2 dimer formation, whether enhancing or inhibiting the process, yields pro-inflammatory phenotypes, through either autophagy-dependent processes or secretion of AGR2, respectively. We also demonstrate that in IBD and specifically in Crohn's disease, the levels of AGR2 dimerization modulators are selectively deregulated, and this correlates with severity of disease. Our study demonstrates that AGR2 dimers act as sensors of ER homeostasis which are disrupted upon ER stress and promote the secretion of AGR2 monomers. The latter might represent systemic alarm signals for pro-inflammatory responses.
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Vascularite des gros vaisseaux : facteurs pronostics et comparaison de l’évolution à long terme de l’artérite gigantocellulaire et de la maladie de Takayasu. Rev Med Interne 2019. [DOI: 10.1016/j.revmed.2019.10.110] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Importance of Combining Advanced Particle Size Analysis Techniques To Characterize Cell-Penetrating Peptide-Ferrocifen Self-Assemblies. J Phys Chem Lett 2019; 10:6613-6620. [PMID: 31609118 DOI: 10.1021/acs.jpclett.9b01493] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
The design of a simple platform to target the delivery of notably hydrophobic drugs into cancer cells is an ultimate goal. Here, three strategies were combined in the same nanovector, in limiting the use of excipients: cell-penetrating peptides, an amphiphilic prodrug, and self-assembly. Light scattering and cryogenic transmission electron microscopy revealed one size population of objects around 100 nm with a narrow size distribution. However, in-depth analysis of the suspension by nanoparticle tracking analysis, small-angle X-ray scattering, and nuclear magnetic resonance (NMR) diffusometry demonstrated the presence of another population of small objects (<2 nm). It has been shown that these small self-assemblies represented >99% of the matter! This presence was clearly and unambiguously demonstrated by NMR diffusometry experiments. The study highlights the importance and the complementary contribution of each characterization method to reflect the reality of the studied nanoassembly.
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Stage IV cutaneous squamous cell carcinoma: treatment outcomes in a series of 42 patients. J Eur Acad Dermatol Venereol 2019; 34:1202-1209. [PMID: 31587382 DOI: 10.1111/jdv.16007] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2019] [Accepted: 08/28/2019] [Indexed: 12/30/2022]
Abstract
BACKGROUND The prevalence and incidence of cutaneous squamous cell carcinoma (cSCC) are increasing due to the ageing of the population and sun exposure. Advanced cSCC forms (locally advanced and/or locoregional metastatic and/or distant metastatic) account for approximately 3% of cSCC and can result in death. OBJECTIVE Analysis of the clinical characteristics and treatment outcomes in stage IV cSCC with unresectable locoregional extension and/or the presence of metastases. METHODS A retrospective study was conducted at a single-centre university hospital for stage IV cSCC patients followed between 1 January 2008 and 31 December 2015. Descriptive analyses (demographic, anatomo-clinical characteristics, treatment sequences, response to treatment and survival analysis) were performed. RESULTS The study included 42 patients (median age = 75.5 years) with a diagnosis of stage IV cSCC who were treated with at least one line of chemotherapy and/or cetuximab. At the time of diagnosis, 85.7% of the patients had locoregional extension (19% of locally advanced and 67% of locoregional metastatic) and 14.3% had distant metastatic disease. Regarding treatment, 40% and 36% of patients received no more than 1 and 2 systemic treatment lines, respectively. The 4-year overall survival was 6%, and the median follow-up was 18.6 months. The objective response rate was 55% after the first line of treatment with a median progression-free survival (PFS) of 6.18 months and 12% after the second line with a median PFS of 6.51 months. Grade 3 and 4 adverse events were observed for 33% of patients. CONCLUSION Our study confirms a very poor prognosis of stage IV cSCC and a poor response to conventional therapies, indicating that the stage IV cSCC patient population remains with unmet medical needs.
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P1838Thrombocytopenia under ECMO and Shear-induced shedding of platelet receptor Glycoprotein-(GP)Ialpha. Eur Heart J 2019. [DOI: 10.1093/eurheartj/ehz748.0590] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Abstract
Background
Several mechanisms are suspected to thrombocytopenia under Extracorporeal Membrane Oxygenation (ECMO) such as platelet-consumption or sepsis. Shedding of glycoprotein-(GP)Ibα is a recently identified mechanism of platelet clearance. ECMO generates high shear stress forces that could impact GPIbα-shedding. We hypothesized that ECMO continuous-flow devices could directly induce thrombocytopenia through shear-induced GPIbα-shedding.
Aims
Determine if ECMO induce GpIb-shedding in vitro and in vivo and determinates the kinetic evolution of platelet-count and GpIb-shedding after patient's implantation.
Methods
Platelet GPIbα-shedding was first investigated in vitro using a high-shear pump loop model. Plasma with normal platelet count (plasma-NPC) was obtained by dilution of platelet-rich plasma obtained from healthy donors in fresh-frozen-plasma. Samples were collected before and after (5, 30, 60 and 180 min) perfusion at 37°C of plasma-NPC at intermediate and high speed (2.6 and 3.6 L min–1 respectively, n=4 each). Platelet count and GPIbα-shedding were next investigated in 20 ECMO patients before/after implantation (WITECMO trial) and in 20 healthy volunteers. The geometric mean-fluorescence-intensity (gMFI) of platelet GPIbα (PE-staining) and GPIX (FITC-staining) was measured with a Navios flow cytometer (Beckman Coulter, Miami, FL). Results are expressed as GPIbα/GPIX gMFI-ratio.
Results
A significant time-dependent loss of GPIbα/GPIX gMFI-ratio was already apparent after 30 min in vitro and was significantly more pronounced at high-speed compared to intermediate-speed (pANOVA<0.001 and p<0.01 at 180 min respectively). GPIbα/GPIX gMFI-ratio was significantly increased in ECMO patients compared to healthy subjects 1- and 24-hour after implantation (p<0.001). A significantly lower platelet count was observed 1 hour after ECMO implantation (−23% vs baseline, p<0.01) with a further significant decrease at 24-hours (−53% vs baseline, p<0.0001).
Figure 1. A. Significant time-dependent loss of platelet GPIbα/GPIX gMFI-ratio (pANOVA <0.001) assessed by flow-cytometry after 30 min of perfusion at 3.6 L/min with a high-shear continuous-flow device in vitro. B. Representative experiment showing the apparition of a platelet sub-population with loss of GPIbα expression after 30 min of perfusion at 3.6 L/minwith a high-shear continuous-flow device in vitro.
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Survival trends in critically ill oncology patients: Impact of patient’s eligibility to post-ICU chemotherapy. Ann Oncol 2019. [DOI: 10.1093/annonc/mdz265.045] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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Modulation of a new pathway prevent valvular interstitial cells calcification, a potential innovative therapeutic target in aortic valve stenosis. ARCHIVES OF CARDIOVASCULAR DISEASES SUPPLEMENTS 2019. [DOI: 10.1016/j.acvdsp.2019.02.160] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Valvular interstitial cells down regulate matrix metalloproteinase 9 activity and expression in human monocyte-derived macrophages: Potential impact on aortic valve stenosis pathophysiology. ARCHIVES OF CARDIOVASCULAR DISEASES SUPPLEMENTS 2019. [DOI: 10.1016/j.acvdsp.2019.02.143] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Continuous-flow mechanical circulatory support induces shedding of platelet adhesion receptors GpIb and GpVI. ARCHIVES OF CARDIOVASCULAR DISEASES SUPPLEMENTS 2019. [DOI: 10.1016/j.acvdsp.2019.02.029] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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[Staphylococcal toxic shock syndrome should be considered in the event of diffuse erythema with fever and shock]. Ann Dermatol Venereol 2019; 146:287-291. [PMID: 30691878 DOI: 10.1016/j.annder.2018.12.002] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2018] [Revised: 08/24/2018] [Accepted: 12/03/2018] [Indexed: 11/25/2022]
Abstract
BACKGROUND Toxic shock syndrome (TSS) was first described by Todd in 1978. The relevant Lancet publication reported 7 cases of children with fever, exanthema, hypotension and diarrhoea associated with multiple organ failure. An association between TSS and use of hyper-absorbent tampons in menstruating women was discovered in the 1980s. Following the market withdrawal of such tampons, TSS virtually disappeared. Herein we report a new case of TSS in a 15-year-old girl. PATIENTS AND METHODS A 15-year-old patient was admitted to intensive care for severe sepsis and impaired consciousness associated with diffuse abdominal pain. Dermatological examination revealed diffuse macular exanthema. Laboratory tests showed hepatic cytolysis (ASAT 101 U/L, ALAT 167 U/L, total bilirubin 68μmol/L) and an inflammatory syndrome. Lumbar puncture and blood cultures were sterile while thoraco-abdomino-pelvic and brain scans were normal. The patient was menstruating and had been using a tampon over the previous 24hours. Vaginal sampling and tampon culture revealed TSST-1 toxin-producing S. aureus. Management consisted of intensive care measures and treatment with amoxicillin-clavulanic acid and clindamycin for 10 days. CONCLUSION In case of septic shock associated with diffuse macular exanthema a diagnosis of TSS must be envisaged, particularly in menstruating women.
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Carcinomes épidermoïdes cutanés stade IV : expérience rétrospective d’un centre expert français. Ann Dermatol Venereol 2018. [DOI: 10.1016/j.annder.2018.09.255] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Hépatites aiguës induites par les immunothérapies anti-tumorales (HAII) : aspects cliniques et prise en charge. Ann Dermatol Venereol 2018. [DOI: 10.1016/j.annder.2018.09.101] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Staphylococcus aureus Extracellular Vesicles Elicit an Immunostimulatory Response in vivo on the Murine Mammary Gland. Front Cell Infect Microbiol 2018; 8:277. [PMID: 30186772 PMCID: PMC6113362 DOI: 10.3389/fcimb.2018.00277] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2018] [Accepted: 07/25/2018] [Indexed: 12/20/2022] Open
Abstract
Staphylococcus aureus is a major pathogen responsible for bovine mastitis, the most common and costly disease affecting dairy cattle. S. aureus naturally releases extracellular vesicles (EVs) during its growth. EVs play an important role in the bacteria-bacteria and bacteria-host interactions and are notably considered as nanocarriers that deliver virulence factors to the host tissues. Whether EVs play a role in a mastitis context is still unknown. In this work, we showed that S. aureus Newbould 305 (N305), a bovine mastitis isolate, has the ability to generate EVs in vitro with a designated protein content. Purified S. aureus N305-secreted EVs were not cytotoxic when tested in vitro on MAC-T and PS, two bovine mammary epithelial cell lines. However, they induced the gene expression of inflammatory cytokines at levels similar to those induced by live S. aureus N305. The in vivo immune response to purified S. aureus N305-secreted EVs was tested in a mouse model for bovine mastitis and their immunogenic effect was compared to that of live S. aureus N305, heat-killed S. aureus N305 and to S. aureus lipoteichoic acid (LTA). Clinical and histopathological signs were evaluated and pro-inflammatory and chemotactic cytokine levels were measured in the mammary gland 24 h post-inoculation. Live S. aureus induced a significantly stronger inflammatory response than that of any other condition tested. Nevertheless, S. aureus N305-secreted EVs induced a dose-dependent neutrophil recruitment and the production of a selected set of pro-inflammatory mediators as well as chemokines. This immune response elicited by intramammary S. aureus N305-secreted EVs was comparable to that of heat-killed S. aureus N305 and, partly, by LTA. These results demonstrated that S. aureus N305-secreted EVs induce a mild inflammatory response distinct from the live pathogen after intramammary injection. Overall, our combined in vitro and in vivo data suggest that EVs are worth to be investigated to better understand the S. aureus pathogenesis and are relevant tools to develop strategies against bovine S. aureus mastitis.
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Live-cell imaging of new polyene sterols for improved analysis of intracellular cholesterol transport. J Microsc 2018. [PMID: 29516493 DOI: 10.1111/jmi.12691] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
Analysis of intracellular cholesterol transport by fluorescence microscopy requires suitable fluorescent analogues of cholesterol. Most existing cholesterol analogues contain lipophilic dyes which can compromise the sterol properties in membranes. An alternative strategy is to introduce additional double bonds into the sterol ring system resulting in intrinsic fluorescence, while at the same time keeping the cholesterol-like properties of the analogues. Existing polyene sterols, such as dehydroergosterol (DHE) or cholestatrienol (CTL), however, contain only three double bonds and suffer from low brightness, significant photobleaching and excitation/emission in the ultraviolet region. Thus, special equipment is required to image such sterols. Here, we describe synthesis, characterization and intracellular imaging of new polyene sterols containing four conjugated double bonds in the sterol ring system. We show that such analogues have red-shifted excitation and emission by ∼20 nm compared to DHE or CTL. The red shift was even more pronounced when preventing keto-enol tautomer equilibration by protecting the 3'-hydroxy group with acetate. We show that the latter analogue can be imaged on a conventional wide field microscope with a DAPI/filipin filter cube. The new polyene sterols show reduced photobleaching compared to DHE or CTL allowing for improved deconvolution microscopy of sterol containing cellular membranes.
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Risque de syndrome de Guillain-Barré après une chirurgie : une étude de type « case-crossover » à partir des données du Sniiram (2009–2014). Rev Epidemiol Sante Publique 2018. [DOI: 10.1016/j.respe.2018.01.035] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
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P5812Acquired von willebrand factor defect under continuous-flow ventricular assist devices: modulation by dynamic changes of pulsatility. Eur Heart J 2017. [DOI: 10.1093/eurheartj/ehx493.p5812] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Mimicking The Physiopathology Of Aortic Valve Stenosis In Vitro: Which Osteogenic Media On Human Valvular Interstitial Cells ? ARCHIVES OF CARDIOVASCULAR DISEASES SUPPLEMENTS 2017. [DOI: 10.1016/s1878-6480(17)30542-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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[Methods of data selection from the French medical information system program for trauma patient's analysis: Burns and traumatic brain injuries]. Rev Epidemiol Sante Publique 2017; 65 Suppl 4:S220-S225. [PMID: 28372834 DOI: 10.1016/j.respe.2017.01.116] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2016] [Revised: 01/03/2017] [Accepted: 01/11/2017] [Indexed: 10/19/2022] Open
Abstract
BACKGROUND Data from the French medical information system program in medicine, surgery, obstetrics and dentistry can be adapted in some cases and under certain conditions, to account for hospitalizations for injuries. Two areas have been explored: burn and traumatic brain injury victims. METHODS An algorithm selecting data from the Medical information system program was established and implemented for several years for the study of burn victims. The methods of selection of stays for traumatic brain injuries, which are the subject of a more recent exploration, are described. RESULTS Production of results in routine on the hospitalization for burns. Expected production of results on the hospitalization for traumatic brain injuries. CONCLUSION In both cases, the knowledge obtained from these utilizations of the Medical information system program contributes to epidemiological surveillance and prevention and are useful for health care organization.
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Qualité du codage des causes de brûlures dans le PMSI en 2014 et évolution depuis 2008, France métropolitaine. Rev Epidemiol Sante Publique 2017. [DOI: 10.1016/j.respe.2017.01.091] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022] Open
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Les victimes de brûlures : hospitalisations selon le PMSI. France métropolitaine. Rev Epidemiol Sante Publique 2016. [DOI: 10.1016/j.respe.2016.06.188] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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Surveillance épidémiologique des traumatismes crâniens à partir des données d’hospitalisation. Rev Epidemiol Sante Publique 2016. [DOI: 10.1016/j.respe.2016.06.024] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022] Open
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[French residents' training in instrumental deliveries: A national survey]. ACTA ACUST UNITED AC 2016; 45:1186-1193. [PMID: 27312098 DOI: 10.1016/j.jgyn.2016.05.003] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2016] [Revised: 04/17/2016] [Accepted: 05/06/2016] [Indexed: 10/21/2022]
Abstract
OBJECTIVES To evaluate French residents in Obstetrics and Gynaecology's training in instrumental deliveries in 2015. PATIENTS AND METHODS We conducted a national descriptive survey among 758 residents between December 2014 and January 2015. Respondents were invited by email to specify their University Hospital, their current university term, the number of instrumental deliveries performed by vacuum extractor, forceps or spatulas, and whether they made systematic ultrasound exams before performing the extraction. RESULTS Response rate was 34.7 % (n=263). There were important differences between regions in terms of type of instruments used. Vacuum extractor was the most commonly used instrument for instrumental deliveries by French residents (56.9 %), more than forceps (25.2 %) and spatulas (17.9 %). At the end of the residency, all the residents had been trained in instrumental deliveries with at least two instruments. CONCLUSION The training of difficult techniques as well as their perfect control is required for instrumental deliveries. Yet, we are forced to note that there are substantial differences in the French residents' training in instrumental deliveries depending on their region. So, teaching at least two techniques seems essential as well as improving the training capacities and standardizing practices. A greater systematization of the teaching of the mechanics and obstetric techniques might be a solution to be considered too.
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[Life-threatening Panton-Valentine leukocidin-associated staphylococcal infections in children. A broad spectrum of clinical presentations]. Arch Pediatr 2014; 21:1220-5. [PMID: 25284731 DOI: 10.1016/j.arcped.2014.08.016] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2013] [Revised: 05/08/2014] [Accepted: 08/01/2014] [Indexed: 11/26/2022]
Abstract
Panton-Valentine leukocidin (PVL) is a major toxic virulence factor secreted by community-acquired methicillin-sensitive or methicillin-resistant Staphylococcus aureus (SA). SA-PVL can be responsible for life-threatening infections in healthy children with a wide spectrum of clinical presentations involving lung, skin, and soft tissues or bones and joints. PVL production should always be considered in severe SA infections. The pediatric medicine community remains poorly informed regarding the therapeutic management of this infection, which should be early and aggressive. Intravenous empiric antibiotics against SA and its toxins must be given with early and sometimes iterative surgical procedures to drain abscesses and to stop bacterial proliferation and necrosis in the tissues. Here, we report the cases of three patients admitted for SA-PVL infections to the pediatric intensive care unit. Initial clinical presentation in the three patients was multifocal osteomyelitis associated with necrotizing pneumonia; severe skin infection with septic shock; and non-necrotic pneumonia with pleural and pericardial effusion. Appropriate treatments resulted in a good outcome in all cases. Following these illustrations, we describe a number of practical key points in the optimal medical and surgical management of severe SA-PVL infections, with a review of the literature.
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Ductal Carcinoma in Situ (Dcis) Treated By Mastectomy, or Local Excision with or Without Radiotherapy: a Retrospective Study About 608 Women. Ann Oncol 2014. [DOI: 10.1093/annonc/mdu327.58] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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SFP CO-57 - Formation aux gestes d’urgence par simulation: validation de grilles d’évaluation. Arch Pediatr 2014. [DOI: 10.1016/s0929-693x(14)71968-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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SFP CO-58 - Programme d’enseignement par simulation des gestes technique d’urgence: expérience Nancy-Nice. Arch Pediatr 2014. [DOI: 10.1016/s0929-693x(14)71969-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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SFP P-102 - Une coqueluche maligne d’évolution favorable sous ECMO. Arch Pediatr 2014. [DOI: 10.1016/s0929-693x(14)72072-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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SFP PC-41 - Encéphalite à anticorps anti-récepteurs NMDA : À propos d’un cas. Arch Pediatr 2014. [DOI: 10.1016/s0929-693x(14)72191-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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