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Noninvasive in situ assessment of structural alteration of human dermis caused by photoaging using a novel collagen-specific imaging technique / Toyonobu Yamashita in IFSCC MAGAZINE, Vol. 16, N° 1 (01-02-03/2013)
[article]
Titre : Noninvasive in situ assessment of structural alteration of human dermis caused by photoaging using a novel collagen-specific imaging technique Type de document : document électronique Auteurs : Toyonobu Yamashita, Auteur ; Yuki Ogura, Auteur ; Yuji Tanaka, Auteur ; Ryosuke Tanaka, Auteur ; Takeshi Yasui, Auteur ; Tsutomu Araki, Auteur ; Tetsuji Hirao, Auteur Année de publication : 2013 Article en page(s) : p. 3-7 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Collagène
Génération de seconde harmoniqueLa génération de seconde harmonique (GSH) également appelé doublage de fréquence) est un processus d'optique non-linéaire dans lequel des photons interagissant avec un matériau non-linéaire sont combinés pour former de nouveaux photons avec le double de l'énergie, donc avec le double de la fréquence ou la moitié de la longueur d'onde des photons initiaux.
Imagerie médicale
Microscopie
Photovieillissement (dermatologie)Index. décimale : 668.5 Parfums et cosmétiques Résumé : Specific visualization and assessment of human collagen fibers were demonstrated using a developed second-harmonic-generation (SHG) microscope equipped with a Cr:forsterite laser (1250 nm). Initially, we examined the specific sensitivity of SHG imaging for collagen fibers using excised human skin specimens. Age-related dermal alterations in female subjects were then evaluated by means of SHG microscopy. The developed SHG microscope enabled us to observe the collagen fibers in the skin sections ; their SHG images correlated well with the Elastica-van-Gieson-stained sections of dermal fibers. In vivo imaging of human skin with a wide field of view as also achieved. En face SHG images of facial skin of female subjects of different ages showed the structural alterations in the collagen fiber network. Additional image analysis of SHG images based on two-dimensional Fourier transformation also reflected age-related alterations. In conclusion, this proposed methodology can be a powerful tool in fields such as anti-aging dermatology and validation of the efficacy of cosmetic products. Note de contenu : - MATERIALS AND METHODS : Optical imaging systems - Specific sensitivity to collagen fibers - Evaluation of human skin
- RESULTS AND DISCUSSION : Comparison of SHG images and elastica-van-Gieson stained section images - In vivo visualization of human cheek skin - Age-related alteration of collagen fibersPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=17826
in IFSCC MAGAZINE > Vol. 16, N° 1 (01-02-03/2013) . - p. 3-7[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 14814 - Périodique Bibliothèque principale Documentaires Disponible Nouvelles du collagène / Günter Reich in INDUSTRIE DU CUIR (IDC), N° 2013/04 (07-08-09/2013)
[article]
Titre : Nouvelles du collagène : Rapport sur les 5e symposium sur le collagène célébré au FILK Type de document : texte imprimé Auteurs : Günter Reich, Auteur Année de publication : 2013 Article en page(s) : p. 22-29 Langues : Français (fre) Catégories : Collagène
Congrès et conférencesIndex. décimale : 675 Technologie du cuir et de la fourrure Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19194
in INDUSTRIE DU CUIR (IDC) > N° 2013/04 (07-08-09/2013) . - p. 22-29[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 15489 - Périodique Bibliothèque principale Documentaires Disponible Novel procedure for large-scale purification of atelocollagen by selective precipitation / S. S. Maier in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CV, N° 1 (01/2010)
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Titre : Novel procedure for large-scale purification of atelocollagen by selective precipitation Type de document : texte imprimé Auteurs : S. S. Maier, Auteur ; I. Buciscanu, Auteur ; V. Maier, Auteur Année de publication : 2010 Article en page(s) : p. 1-8 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Collagène
Précipitation (chimie)
Produits chimiques -- PurificationIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : This paper describes a novel procedure for the purification of raw atelocollagen solutions, based on a multi-stage selective precipitation of the protein fractions, using polyethylene glyclos (PEGs) as crowding agents. The precipitation selectivity was provided by the simultaneous effect of pH and crowding agents. Two adjuvants were added to improve the precipitation selectivity : ethanol and trimethylamine-N-oxide (TMAO). An optimal composition of the crowding mixture, consisting of 23 % PEG 400, 61 % PEG 6000 and 16 % PEG 20000, induced a "screening" effect within the isoelectric range of atelocollagen. The optimal recipe for the screening of an atelocollagen sol obtained at plant scale was : 80g/L crowding mixture, 0.2 molar TMAO, 0.3 molar ethanol, pH = 3.8, processing time : 4-6 hr at 5 / 10°C. The proposed procedure is useful in the manufacture of colloidal collagen solutions, in order to replace or to facilitata expensive and denaturing operations, like ultrafiltration. Note de contenu : - Materials and reagents
- Methods
- The primary atelocollagen solution
- The enzyme refining
- The ultrapurification procedure
- The colloidal system turbidity
- Total protein nitrogen content
- Undesirable protein fractions and debris, pp
- Table 1 : The restricted mixture design matrix and the measured responses values
- Table 2 : Coefficients of the mathematical models fitted to mixture formulation experimental dataEn ligne : https://drive.google.com/file/d/1k0xMjjuCPWzGJFU8lgIJ0GGViIub8c_x/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8083
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Code-barres Cote Support Localisation Section Disponibilité 011907 - Périodique Bibliothèque principale Documentaires Disponible Olive leaf-derived PPAR agonist complex induces collagen IV synthesis in human skin models / George P. Majewski in INTERNATIONAL JOURNAL OF COSMETIC SCIENCE, Vol. 43, N° 6 (12/2021)
[article]
Titre : Olive leaf-derived PPAR agonist complex induces collagen IV synthesis in human skin models Type de document : document électronique Auteurs : George P. Majewski, Auteur ; Smrita Singh, Auteur ; Krzysztof Bojanowski, Auteur Année de publication : 2021 Article en page(s) : p. 662-676 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Antiâge
Barrière cutanée
Cellules -- Cultures et milieux de culture
Collagène
Collagène -- Synthèse
Dermo-cosmétologie
Extraits de plantes:Extraits (pharmacie)
Modèles numériques
Olivier et constituants
Peau -- Soins et hygiène
Peau humaineIndex. décimale : 668.5 Parfums et cosmétiques Résumé : - Introduction : Peroxisome proliferator-activated receptor (PPAR) agonists are known to modulate the synthesis of dermal lipids and proteins including collagens. Olive (Olea europaea) leaves have been reported to contain PPAR-binding ligands. Collagen IV, a major dermal-epidermal junction (DEJ) protein, degrades with both age and disease. Here, we report the formulation of a novel multi-ligand complex, Linefade, and its effects on collagen IV synthesis.
- Methods : Linefade prepared from the leaves of Olea europaea contains 2% w/w plant extract solids dissolved in a mixture of glyceryl monoricinoleate and dimethyl isosorbide. In silico docking was performed with PPAR-α (PDB ID: 2P54). Linefade was evaluated for PPAR-α-dependent transcription in a luciferase reporter assay system. Cell viability and collagen IV levels in human dermal fibroblast cultures were measured using the MTT method and ELISA assay, respectively. Transcriptome analysis was conducted on a full-thickness reconstituted human skin (EpiDermFT) model. Ex vivo cell viability and collagen IV immunostaining were performed on human skin explants.
- Results : In silico docking model of the major constituents (oleanolic acid and glyceryl monoricinoleate) produced a co-binding affinity of −6.7 Kcal/mole. Linefade significantly increased PPAR-α transcriptional activity in CHO cells and collagen IV synthesis in adult human dermal fibroblasts. Transcriptome analysis revealed that 1% Linefade modulated the expression of 280 genes with some related to epidermal differentiation, DEJ, PPAR, Nrf2 and retinoid pathways. An ex vivo human explant study showed that 1% Linefade, delivered via a triglycerides excipient, increased collagen IV levels along the dermal–epidermal junction by 52%.
- Conclusion : In silico modelling and in vitro and ex vivo analyses confirmed Linefade-mediated activation of PPAR-α and stimulation of collagen IV synthesis.Note de contenu : MATERIALS AND METHODS : Materials - Preparation of linefade - In silico modelling technique and validation - In vitro cell studies - Assay on reconstituted skin substitutes - Ex vivo study - Statistical analysis
- RESULTS : In silico modelling - In vitro cell studies - Transcriptome analysis - Human explants (Collagen IV)DOI : https://doi.org/10.1111/ics.12742 En ligne : https://drive.google.com/file/d/1BeDt-gYbDKZbvjDvfvDYue6axRMi-oNy/view?usp=shari [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37048
in INTERNATIONAL JOURNAL OF COSMETIC SCIENCE > Vol. 43, N° 6 (12/2021) . - p. 662-676[article]On the shrinkage kinetic of collagen / Guillermo O. Sarli in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 60 (Année 1976)
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Titre : On the shrinkage kinetic of collagen Type de document : texte imprimé Auteurs : Guillermo O. Sarli, Auteur ; J. Raùl Grigera, Auteur Année de publication : 1976 Article en page(s) : p. 113-114 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Collagène
Cuirs et peaux
Température de retrait
ThermocinétiqueIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : The shrinkage kinetic of collagen was first used by Weirl to measure the activation enthalpy and entropy of the fibre-random coil transition of collagen.
The early results shown a relative simple kinetic, characterised by a single parameter, namely the half time of the process. Later on, a more sophisticated intepretation of the kinetic was suggested. The curves shown in these works are very simple.
The stability of collagen fibres is widely measured by means of the shrinkage temperature. This parameter is very easy to measure and, if the process is as simple as was described, it may well characterise the transition with enough accuracy. It is probable that on this account there have not been many new works published on shrinkage kinetic.Note de contenu : - Fig. 1 : Diagram of the apparatus
- Fig. 2a : Shrinkage kinetic of rat tail tendon hydrated 24 h in distilled water, a) Shrunk inwater
- Fig. 2b : Shrunk in aqueous solution of dioxane 4:11 molal.En ligne : https://drive.google.com/file/d/1NBQSXEFcgv_cWRfShkCnoB3elCrpObb0/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35261
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 60 (Année 1976) . - p. 113-114[article]Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 008596 - Périodique Archives Documentaires Exclu du prêt Optimising conditions for preparing collagen-type hydrolysates / Pavel Mokrejs in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 100, N° 3 (05-06/2016)
PermalinkOptimization of enzyme-assisted phenolic reactions applied to thermal stabilization of collagen using response surface methodology / Leticia Melo Dos Santos in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXI, N° 2 (02/2016)
PermalinkPermalinkPhysicochemical properties of collagen, gelatin and collagen hydrolysate derived from bovine limed split waste / Zhongkai Zhang in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 90, N° 1 (01-02/2006)
PermalinkPolyethylene glycol as a preservative for pigskin and its interaction with collagen / Chunhua Wang in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIII, N° 10 (10/2018)
PermalinkPolymer bio-composites based on collagen / Ján Matyasovsky in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVII, N° 10 (10/2012)
PermalinkPotential uses of tanned collagen / Robert M. Lollar in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XXVII (Année 1982)
PermalinkPowdered hide model for vegetable tanning / Eleanor M. Brown in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIX, N° 1 (01/2014)
PermalinkPreliminary experiments in the development of a test for heat damage / Susan Wolter in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXII (Année 1977)
PermalinkPreparation and analysis of collagen polypeptide from hides by enzymes / Li Yanchun in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 89, N° 3 (05-06/2005)
PermalinkPreparation and application of collagen-based waterborne polyurethane retanning agent / Li Chengtao in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 101, N° 3 (05-06/2017)
PermalinkPreparation and application of a high exhaustion chrome tanning auxiliary from limed fleshings / Hongjiao Liang in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 107, N° 3 (05-06/2023)
PermalinkPreparation and characterization of collagen grafted by styrene-butyl acrylate and its application for paper sizing / Sufeng Zhang in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIX, N° 12 (12/2014)
PermalinkPreparation and characterization of collagen-tio2 nanocomposite improved by glutaraldehyde / Zhou Nan in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 90, N° 5 (09-10/2006)
PermalinkPreparation and characterization of modified protein retanning agent based on leather waste / Wang Xuechuan in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 100, N° 3 (05-06/2016)
PermalinkPreparation and drug-released properties of electrospun core-shell nanofibers / Guo Huiwen in CHEMICAL FIBERS INTERNATIONAL, Vol. 66, N° 4 (12/2016)
PermalinkPreparation and drug-released properties of electrospun core-shell nanofibers / Guo Huiwen in CHEMICAL FIBERS INTERNATIONAL, (10/2017)
PermalinkPreparation of oxidised polyvinyl alcohol using hydrogen peroxide and its application for collagen modification / Baohua Liu in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 103, N° 1 (01-02/2019)
PermalinkPrévention des vergetures par application topique. Un essai pratique à l'insu de patient et du médecin / J. Mallol in INTERNATIONAL JOURNAL OF COSMETIC SCIENCE, Vol. 13, N° 1 (02/1991)
PermalinkProcter memorial lecture collagen, 1891-1977 : retrospect and prospect / Alan Gordon Ward in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 62, N° 1 (01-02/1978)
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