Search results for "C50"
showing 10 items of 182 documents
Modeling multiple taxis: Tumor invasion with phenotypic heterogeneity, haptotaxis, and unilateral interspecies repellence
2021
We provide a short review of existing models with multiple taxis performed by (at least) one species and consider a new mathematical model for tumor invasion featuring two mutually exclusive cell phenotypes (migrating and proliferating). The migrating cells perform nonlinear diffusion and two types of taxis in response to non-diffusing cues: away from proliferating cells and up the gradient of surrounding tissue. Transitions between the two cell subpopulations are influenced by subcellular (receptor binding) dynamics, thus conferring the setting a multiscale character. We prove global existence of weak solutions to a simplified model version and perform numerical simulations for the full se…
Exploring the anticancer potential of pyrazolo[1,2-a]benzo[1,2,3,4] tetrazin-3-one derivatives: The effect on apoptosis induction, cell cycle and pro…
2013
In order to investigate their anticancer potential, four new pyrazolo[1,2-a]benzo[1,2,3,4]-tetrazinone derivatives, designed through the chemometric protocol VLAK, and three of the most active compounds of the previous series have been evaluated on some cellular events including proliferation, apoptosis induction, and cell cycle. The NCI one dose (10 mu M) screening revealed that the 8,9-di-methyl derivative showed activity against Leukemia (CCRF-CEM) and Colon cancer cell line (COLO 205), reaching 81% and 45% of growth inhibition (GI), respectively. Replacement of the two methyl groups with two chlorine atoms maintained the activity toward Leukemia cell (CCRF-CEM, GI 77%) and selectively e…
Vaccinum ģints ogu spiedpalieku ekstraktu efekti uz alfa glikozidāzes aktivitāti
2018
Alfa-glikozidāzes inhibitori ir orāli pretdiabēta līdzekļi, ko lieto 2. tipa cukura diabēta ārstēšanai, lai novērstu vai palēninātu ogļhidrātu (piemēram, cietes un cukura) gremošanu. Arī starp dabas vielām tiek meklēti alfa-glikozidāzes inhibitori. Darba mērķis: pētīt melleņu, krūmmelleņu, lielogu dzērveņu, dzērveņu un brūkleņu ogu spiedatlieku ekstraktu ietekmi uz alfa glikozidāzes aktivitāti in vitro. Pētījumā ogu sauso ekstraktu aktivitāte ir pētīta ūdens un metanola ekstraktu šķīdumiem. Rezultāti liecina, ka visiem šo ogu ekstraktiem ir alfa glikozidāzes inhibēšanas spēja, bet ekstraktu šķīdumiem ūdenī tā ir gandrīz 10 reizes vājāka kā metanola. No ekstraktu šķīdumiem metanolā vislielāk…
Zileņu izspiedu ekstrakta pretiekaisuma efekti in vitro
2020
Savvaļas ogu bioaktīvi fitoķīmiski savienojumi kopā spēj uzrādīt virkni bioloģisko aktivitāšu, ietekmējot cilvēku veselību. Veselību ietekmējošās bioloģiskās aktivitātes galvenokārt attiecināmas uz sastāvā esošajiem polifenoliem, kuriem piemīt antioksidantu, pretiekaisuma un pretmikrobu īpašības. Darba mērķis ir pētīt zileņu izspiedu ekstrakta pretiekaisuma efektus in vitro. Pētījumā tika pētīta zileņu izspiedu ekstrakta ietekme uz iekaisuma procesos iesaistīto enzīmu - ksantīnoksidāzes, lipoksigenāžu 5 un 15 (LOX-5 un LOX-15) un ciklooksigenāzes 1 (COX-1) aktivitāti, izmantojot fluorimetriskās un kolorimetriskās metodes. Rezultāti liecina, ka zileņu izspiedu ekstrakts inhibē COX-1, LOX-5 u…
Preparation of ferulic acid derivatives and evaluation of their xanthine oxidase inhibition activity.
2007
Several ferulic acid ethyl esters (3a-h) were synthesized under the Knoevengel reaction condition and they were further reduced to afford the respective allylic alcohol derivatives (4a-g). Some of them were evaluated for the xanthine oxidase (XO) inhibitory activity. Among them, 3h exhibited a significant inhibitory activity with an IC50 value of 1.35 x 10(-5) M, while the IC50 value of allopurinol used as the positive control was 1.49 x 10(-5) M. The study suggested that the higher acidity of the phenolic OH group in the ferulic acid derivatives might result in improved XO inhibitory activity.
Darboux curves on surfaces I
2017
International audience; In 1872, G. Darboux defined a family of curves on surfaces of $\mathbb{R}^3$ which are preserved by the action of the Mobius group and share many properties with geodesics. Here, we characterize these curves under the view point of Lorentz geometry and prove that they are geodesics in a 3-dimensional sub-variety of a quadric $\Lambda^4$ contained in the 5-dimensional Lorentz space $\mathbb{R}^5_1$ naturally associated to the surface. We construct a new conformal object: the Darboux plane-field $\mathcal{D}$ and give a condition depending on the conformal principal curvatures of the surface which guarantees its integrability. We show that $\mathcal{D}$ is integrable w…
Stilbenes and resveratrol metabolites improve mitochondrial fatty acid oxidation defects in human fibroblasts
2014
International audience; Background: Inborn enzyme defects of mitochondrial fatty acid beta-oxidation (FAO) form a large group of genetic disorders associated to variable clinical presentations ranging from life-threatening pediatric manifestations up to milder late onset phenotypes, including myopathy. Very few candidate drugs have been identified in this group of disorders. Resveratrol (RSV) is a natural polyphenol with anti-oxidant and anti-inflammatory effects, recently shown to have beneficial metabolic properties in mice models. Our study explores its possible effects on FAO and mitochondrial energy metabolism in human cells, which are still very little documented.Methods: Using cells …
Matrices de pondérations et contexte spatio-temporel en économétrie spatiale
2013
International audience
Investigating the Antiproliferative and Antioxidant Properties of Pancratium maritimum L. (Amaryllidaceae) Stems, Flowers, Bulbs, and Fruits Extracts
2018
Pancratium maritimumstems, flowers, bulbs, and fruits extracts were investigated for their antiproliferative and antioxidant properties. Total phenols and total flavonoids were also determined. Thein vitroantiproliferative activity was tested against seven cancer cell lines such as C32, HeLa, MDA-MB-231, PC3, A549, MCF-7, and LNCaP by using SRB assay. Interesting results were obtained with stems ethanol extract (ET1) against C32 cells (IC50of 27.1μg/mL) and fruits aqueous extract (AQ) against MCF-7 cell line (IC50of 36.5μg/mL). To define the antioxidant activity, four tests such as DPPH, ABTS FRAP, andβ-carotene bleaching tests were used.The most promising ABTS scavenging capacity was obser…
3-(6-Phenylimidazo [2,1-b][1,3,4]thiadiazol-2-yl)-1H-Indole Derivatives as New Anticancer Agents in the Treatment of Pancreatic Ductal Adenocarcinoma
2020
A new series of imidazo[2,1-b][1,3,4]thiadiazole derivatives was efficiently synthesized and screened for their in vitro antiproliferative activity on a panel of pancreatic ductal adenocarcinoma (PDAC) cells, including SUIT-2, Capan-1 and Panc-1. Compounds 9c and 9l, showed relevant in vitro antiproliferative activity on all three pre-clinical models with half maximal inhibitory concentration (IC50) ranging from 5.11 to 10.8 µ