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Biophotonique
(8) Production(s) de l'année 2017
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Re: "An Overview of Protocols for the Neural Induction of Dental and Oral Stem Cells In Vitro" by Heng et al. (Tissue Eng Part B 2016;22:220-250)
Auteur(s): Pall Orsolya, Varga B., Collart Dutilleul Pierre-Yves, Gergely C., Cuisinier Frédéric
(Article) Publié:
Tissue Engineering: Parts A, B, And C, vol. 23 p.570-576 (2017)
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Detection and localization of luminescent nanodiamonds in cellular environment using Raman imaging
Auteur(s): Gulka Michal, Varga B., Salehi Hamideh, Middendorp Elodie, Cloitre T., Cuisinier Frédéric J. G., Cígler Petr, Nesladek Milos, Gergely C.
Conference: MRS 2017, Fall Meeting and exhibit (, Boston, US, 2017-11-26)
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Precise nanodiamonds localization in cellular environment
Auteur(s): Gulka Michal, Varga B., Salehi Hamideh, Middendorp Elodie, Cloitre T., Cuisinier Frédéric J. G., Cígler Petr, Nesladek Milos, Gergely C.
Conference: E-MRS 2017, Fall Meeting (Warsaw, PL, 2017-09-18)
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De-adhesion dynamics of melanoma cells from brain endothelial layer.
Auteur(s): Varga B., Domokos Réka A., Fazakas Csilla, Wilhelm I., Krizbai I. A., Szegletes Zsolt, Gergely C., Váró G., Végh A. G.
(Article) Publié:
Bba - General Subjects, vol. p.In Press (2017)
Texte intégral en Openaccess :
Ref HAL: hal-01628314_v1
DOI: 10.1016/j.bbagen.2017.10.013
WoS: 000425197300034
Exporter : BibTex | endNote
2 Citations
Résumé: Metastasis formation is a complex and not entirely understood process. The poorest prognosis and the most feared complications are associated to brain metastases. Melanoma derived brain metastases show the highest prevalence. Due to the lack of classical lymphatic drainage, in the process of brain metastases formation the haematogenous route is of primordial importance. The first and crucial step in this multistep process is the establishment of firm adhesion between the blood travelling melanoma cells and the tightly connected layer of the endothelium, which is the fundamental structure of the blood-brain barrier. This study compares the de-adhesion properties and dynamics of three melanoma cells types (WM35, A2058 and A375) to a confluent layer of brain micro-capillary endothelial cells. Cell type dependent adhesion characteristics are presented, pointing towards the existence of metastatic potential related nanomechanical aspects. Apparent mechanical properties such as elasticity, maximal adhesion force, number, size and distance of individual rupture events showed altered values pointing towards cell type dependent aspects. Our results underline the importance of mechanical details in case of intercellular interactions. Nevertheless, it suggests that in adequate circumstances elastic and adhesive characterizations might be used as biomarkers.
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Comments on: “An Overview of Protocols for the Neural Induction of Dental and Oral Stem Cells In Vitro” Article in Tissue Engineering Part B, Heng et al., February 2016
Auteur(s): Pall Orsolya, Varga B., Collant-Dutilleul Pierre-Yves, Gergely C., Cuisinier Frédéric J. G.
(Article) Publié:
Tissue Engineering: Part B Reviews, vol. p. (2017)
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Atomic Force Microscopy Study of the Topography and Nanomechanics of Casein Micelles Captured by an Antibody
Auteur(s): Bahri Asma, Martin Fernandez M., Gergely C., Pugniere Martine, Chevalier-Lucia Dominique, Marchesseau Sylvie
(Article) Publié:
Langmuir, vol. p. (2017)
Ref HAL: hal-01519914_v1
DOI: 10.1021/acs.langmuir.7b00311
WoS: 000401674900014
Exporter : BibTex | endNote
6 Citations
Résumé: Casein micelles (CMs) are colloidal phospho-protein-mineral complexes naturally present in milk. This study used atomic force microscopy (AFM) in a liquid environment to evaluate the topography and nanomechanics of single native CMs immobilized by a novel capture method. The proposed immobilization method involves weak interactions with theantiphospho-Ser/Thr/Tyr monoclonal antibody covalently bound to a carboxylic acid self-assembled monolayer (SAM)on a gold surface. This capture strategy was compared to the commonly used covalent immobilization method of CMs viacarbodiimide chemistry. With this conventional method, CMs remained mainly mobile during AFM measurements in liquid,disturbing the evaluation of their average size and elastic properties. Conversely, when captured by the specific antibody, they were successfully immobilized and their integrity was preserved during the AFM measurement. The characterization of both CM topography and elastic properties was carried out in a liquid ionic environment at native pH 6.6. The CMs’ capture efficiency via antibody was concurrently proved by surface plasmon resonance. The calculation of casein micelles’ width, height, and contact angle was carried out from the recorded 2D AFM images. CMs were characterized by a mean width of 148 ± 8 nm and a mean height of 42 ± 1 nm. Weak forces were applied to single captured CMs. The obtained force versus indentation curves were fitted using the Hertz model in order to evaluate their elastic properties. The elasticity distribution of native CMs exhibited a unimodal trend with a peak centered at 269 ± 14 kPa.
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Ellipsometric study of peptide layers – island-like character, depolarization and quasi-absorption
Auteur(s): Pápa Z., Ramakrishnan S., Martin Fernandez M., Cloitre T., Zimányi László, Tóth Z., Gergely C., Budai Judit
(Article) Publié:
Applied Surface Science, vol. p. (2017)
Ref HAL: hal-01488411_v1
DOI: 10.1016/j.apsusc.2017.02.263
WoS: 000408756700069
Exporter : BibTex | endNote
1 Citation
Résumé: In this work, the ellipsometric measurements of small molecular size polypeptides deposited onto silicon are analyzed. Results of ellipsometric evaluation procedures based on transparent layer, absorbing layer and discontinuous layer approaches are compared. Although these models result in similar fitting quality and can predict the amount of the deposited material, the gained optical properties can be rather differ- ent due to the different assumptions of the models. To choose the physically correct results, independent measurements as atomic force microscopy or transmission measurement of peptide solutions are nec- essary. It is shown that the measured ellipsometric depolarization can provide also useful information about the sample properties.
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