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Filename: controllers/Detail.php
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Polymeric black tea polyphenols (PBPs) have been shown to possess anti-tumor-promoting effects in two-stage skin carcinogenesis. However, their mechanisms of action are not fully elucidated. In this study, mechanisms of PBP-mediated antipromoting effects were investigated in a mouse model employing the tumor promoter 12-O-tetradecanoylphorbol-13-acetate (TPA). Compared to controls, a single topical application of TPA to mouse skin increased the translocation of protein kinase C (PKC) from cytosol to membrane. Pretreatment with PBPs 1-3 decreased TPA-induced translocation of PKC isozymes (α, β, η, γ, ε) from cytosol to membrane, whereas PBPs 4 and 5 were less effective. The levels of PKCs δ and ζ in cytosol/membrane were similar in all the treatment groups. Complementary confocal microscopic evaluation showed a decrease in TPA-induced PKCα fluorescence in PBP-3-pretreated membranes, whereas pretreatment with PBP-5 did not show a similar decrease. Based on the experiments with specific enzyme inhibitors and phosphospecific antibodies, both PBP-3 and PBP-5 were observed to decrease TPA-induced level and/or activity of phosphatidylinositol 3-kinase (PI3K) and AKT1 (pS473). An additional ability of PBP-3 to inhibit site-specific phosphorylation of PKCα at all three positions responsible for its activation [PKCα (pT497), PKC PAN (βII pS660), PKCα/βII (pT638/641)] and AKT1 at the Thr308 position, along with a decrease in TPA-induced PDK1 protein level, correlated with the inhibition of translocation of PKC, which may impart relatively stronger chemoprotective activity to PBP-3 than to PBP-5. Altogether, PBP-mediated decrease in TPA-induced PKC phosphorylation correlated well with decreased TPA-induced NF-κB phosphorylation and downstream target proteins associated with proliferation, apoptosis, and inflammation in mouse skin. Results suggest that the antipromoting effects of PBPs are due to modulation of TPA-induced PI3K-mediated signal transduction.
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http://dx.doi.org/10.1016/j.freeradbiomed.2012.07.017 | DOI Listing |
Int J Mol Sci
November 2024
Functional Cellular Networks Laboratory, Lee Gil Ya Cancer and Diabetes Institute, Gachon University, Incheon 21999, Republic of Korea.
Steroids, which are often used to treat the inflammation associated with various skin diseases, have several negative side effects. As extract has anti-inflammatory effects in various diseases, we evaluated the efficacy of -derived extracellular vesicles (EVEs) in decreasing 12-O-tetradecanoylphorbol-13-acetate (TPA)-induced inflammation. We determined the effect of the EVEs on the TLR4/NF-κB/NLRP3 inflammasome in human keratinocytes and mouse ear skin.
View Article and Find Full Text PDFCurr Res Pharmacol Drug Discov
October 2024
School of Arts and Sciences, Department of Natural Sciences, Lebanese American University, Byblos, Mount Lebanon, Lebanon.
Sci Rep
November 2024
Instituto Agroforestal Mediterráneo, Universitat Politècnica de València, Valencia, Spain.
In citrus, the synthetic auxin 3,5,6-trichloro-2-pyridyloxyacetic acid (3,5,6-TPA), applied as a foliar spray at a concentration of 15 mg l during physiological fruitlet abscission, caused additional fruitlet drop and reduced the number of fruits reaching maturity. The effect was much more pronounced at full physiological abscission than after. In this study, this thinning effect was successfully exploited for the first time in sour orange trees grown in an urban environment, reducing harvesting costs by up to almost 40%.
View Article and Find Full Text PDFInflammopharmacology
October 2024
Laboratorio de Farmacología, Facultad de Química, Universidad Autónoma de Yucatán, Calle 43, No 613 x calle 90, Col. Inalámbrica, CP. 97069, Mérida, Yucatán, México.
Background: Montanoa grandiflora, a plant species native from Mexico to Central America, locally known as "Teresita" in Yucatán, México, is used to alleviate anxiety, rheumatism, and stomach issues. This study aims to investigate the anti-inflammatory properties of the methanol extract of Montanoa grandiflora leaves (MMG) in experimental models of inflammation.
Methods: Gas chromatography-mass spectroscopy was used to characterize the MMG; cytotoxicity was assessed by MTT assay on murine macrophages and hemolysis assay.
Int Immunopharmacol
December 2024
Department of Technology and Social Services,Dazhou Vocational College of Chinese Medicine, Dazhou, China; Dazhou Chinese Medicine Research and Development Center, Dazhou, China. Electronic address:
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