24 research outputs found
Nichtlineare Dynamik. C: Modellgestuetzte Prozessfuehrung mit Verfahren der nichtlinearen Regelung und Steuerung. C3: Optimale Steuerung und Rueckkopplung chemischer Prozesse Schlussbericht
SIGLEAvailable from TIB Hannover: DtF QN1(63,29) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekBundesministerium fuer Bildung, Wissenschaft, Forschung und Technologie, Bonn (Germany)DEGerman
Investigations on the Effect of Fatty Acid Additives on Casein Micelles: Role of Ethylenic Unsaturation on the Interaction and Structural Diversity
Casein,
one of the major constituent of milk protein, is considered
to be a good candidate for oral drug delivery system. Also, milk transports
various essential fatty acid to blood through dietary supplements.
In this study, we have explored the alteration in the structural characteristic
in terms of the modulations in the microenvironment of the protein
in the presence of different types of fatty acids. Herein, we have
observed that the unsaturation of fatty acids mostly affects the structure
of casein micelles (CMs) by impinging upon the hydrophobic force of
interaction following a decrease in the electrostatic interaction
of various amino acid unit. Alteration of such forces is responsible
for the increase in the aggregate size, modification in the protein
secondary structure, and different morphology of CMs. Fluorescence
behavior of 4-(dicyanomethylene)-2-methyl-6-(4-dimethylaminostyryl)-4<i>H</i>-pyran indicates that the rigidity of the microenvironment
is the main characteristic of the fatty acid binding, and the binding
constant increases with the fatty acid chain length for saturated
fatty acid or with the introduction of unsaturation onto it. Fluorescence
lifetime imaging microscopy study indicates that the microstructure
of CMs becomes more compact in the presence of unsaturated fatty acids,
and this is also responsible for the increase in the diffusion time
of the probe. Moreover, decrease in the fluorescence of extrinsic
probe 8-anilinonaphthalene-1-sulfonate with the addition of unsaturated
fatty acid reveals that these fatty acids alter the electrostatic
interaction between casein units, more specifically in case of the
surface-bound κ-casein. Therefore, this study provides a very
useful information on the binding of fatty acids and helps to evaluate
other fatty acid, as well as different small molecules binding in
the applicative medicinal purpose
Medicinal properties of Angelica archangelica root extract: cytotoxicity in breast cancer cells and its protective effects against in vivo tumor development
Although Angelica archangelica is a medicinal and aromatic plant with a long history of use for both medicinal and food purposes, there are no studies regarding the antineoplastic activity of its root. This study aimed to evaluate the cytotoxicity and antitumor effects of the crude extract of A. archangelica root (CEAA) on breast cancer. The cytotoxicity of CEAA against breast adenocarcinoma cells (4T1 and MCF-7) was evaluated by a 3-(4,5-dimethyl-2-thiazolyl)-2,5-diphenyl-2-H-tetrazolium bromide (MTT) assay. Morphological and biochemical changes were detected by Hoechst 33342/propidium iodide (PI) and annexin V/PI staining. Cytosolic calcium mobilization was evaluated in cells staining with FURA-4NW. Immunoblotting was used to determine the effect of CEAA on anti- and pro-apoptotic proteins (Bcl-2 and Bax, respectively). The 4T1 cell-challenged mice were used for in vivo assay. Using ultra-high-performance liquid chromatography-mass spectrometry analysis, angelicin, a constituent of the roots and leaves of A. archangelica, was found to be the major constituent of the CEAA evaluated in this study (73 mg/mL). The CEAA was cytotoxic for both breast cancer cell lines studied but not for human fibroblasts. Treatment of 4T1 cells with the CEAA increased Bax protein levels accompanied by decreased Bcl-2 expression, in the presence of cleaved caspase-3 and cytosolic calcium mobilization, suggesting mitochondrial involvement in breast cancer cell death induced by the CEAA in this cell line. No changes on the Bcl-2/Bax ratio were observed in CEAA-treated MCF7 cells. Gavage administration of the CEAA (500 mg/kg) to 4T1 cell-challenged mice significantly decreased tumor growth when compared with untreated animals. Altogether, our data show the antitumor potential of the CEAA against breast cancer cells in vitro and in vivo. Further research is necessary to better elucidate the pharmacological application of the CEAA in breast cancer therapy172132140CAPES - Coordenação de Aperfeiçoamento de Pessoal e NÃvel SuperiorCNPQ - Conselho Nacional de Desenvolvimento CientÃfico e TecnológicoFAPESP – Fundação de Amparo à Pesquisa Do Estado De São PauloSem informaçãoSem informação2008/58035-