forrás: https://www.oncotarget.com/article/11108/text/
2021-11-19 11:49:59
Myricetin is a natural dietary flavonoid compound. We evaluated the efficacy of myricetin against intestinal tumorigenesis in adenomatous polyposis coli multiple intestinal neoplasia (APCMin/+) mice. Myricetin was given orally once a day for 12 consecutive weeks. APCMin/+ mice fed with myricetin developed fewer and smaller polyps without any adverse effects. Histopathological analysis showed a decreased number of dysplastic cells and degree of dysplasia in each polyp. Immunohistochemical and western blot analysis revealed that myricetin selectively inhibits cell proliferation and induces apoptosis in adenomatous polyps. The effects of myricetin were associated with a modulation the GSK-3β and Wnt/β-catenin pathways. ELISA analysis showed a reduced concentration of pro-inflammatory cytokines IL-6 and PGE2 in blood, which were elevated in APCMin/+ mice. The effect of myricetin treatment was more prominent in the adenomatous polyps originating in the colon. Further studies showed that myricetin downregulates the phosphorylated p38 MAPK/Akt/mTOR signaling pathways, which may be the mechanisms for the inhibition of adenomatous polyps by myricetin. Taken together, our data show that myricetin inhibits intestinal tumorigenesis through a collection of biological activities. Given these results, we suggest that myricetin could be used preventatively to reduce the risk of developing colon cancers.
forrás: http://medpublics.com/docs/OlimpiqSXC_Retinal.pdf
2021-06-23 10:37:34
Aim: To determine whether treatment with the stem cell stimulator Olimpiq® Stem×Cell prevents increase of retinal and renal vascular permeability in alloxan-induced diabetic rats. Materials and Methods: Two groups of Wistar rats were made diabetic by single intraperitoneal injection of Alloxan. The third, the control group, received vehicle alone. One diabetic group received Olimpiq® Stem×Cell treatment for 4 weeks. The permeability of the blood–retinal barrier (BRB) and renal vessels were measured by the extravasation of fluorescein–labeled bovine serum albumin. Results: Six weeks subsequently to Alloxan injection, significantly elevated the tissue fluorescence, the renal vascular leakage and BRB breakdown was demonstrated in the diabetic group, compared to the nondiabetic group. Olimpiq® Stem×Cell treatment significantly reduced the BRB breakdown, tissue fluorescence, and vascular leakage. Conclusion: Olimpiq® Stem×Cell would be a useful choice of treatment for complications associated with increased vascular permeability of diabetes, such as retinopathy or nephropathy.
forrás: https://app.dimensions.ai/details/publication/pub.1125450507
2021-01-22 10:57:07
In the new millennium, the outbreak of new coronavirus has happened three times: SARS-CoV, MERS-CoV, and 2019-nCoV. Unfortunately, we still have no pharmaceutical weapons against the diseases caused by these viruses. The pandemic of 2019-nCoV reminds us of the urgency to search new drugs with totally different mechanism that may target the weaknesses specific to coronaviruses. Herein, we disclose a new targeted oxidation strategy (TOS II) leveraging non-covalent interactions potentially to oxidize and inhibit the activities of cytosolic thiol proteins via thiol/thiolate oxidation to disulfide (TOD). Quantum mechanical calculations show encouraging results supporting the feasibility to selectively oxidize thiol of targeted proteins via TOS II even in relatively reducing cytosolic microenvironments. Molecular docking against the two thiol proteases Mpro and PLpro of 2019-nCoV provide evidence to support a TOS II mechanism for two experimentally identified anti-2019-nCoV disulfide oxidants: disulfiram and PX-12. Remarkably, disulfiram is an anti-alcoholism drug approved by FDA 70 years ago, thus it can be immediately used in phase III clinical trial for anti-2019-nCoV treatment. Finally, a preliminary list of promising TOS II drug candidates targeting the two thiol proteases of 2019-nCoV are proposed upon virtual screening of 32143 disulfides
forrás: http://www.ncbi.nlm.nih.gov/pubmed/20037479
2014-02-18 09:40:41
BACKGROUND:
Adult stem cells are known to have a reduced restorative capacity as we age and are more vulnerable to oxidative stress resulting in a reduced ability of the body to heal itself. We have previously reported that a proprietary nutraceutical formulation, NT-020, promotes proliferation of human hematopoietic stem cells in vitro and protects stem cells from oxidative stress when given chronically to mice in vivo. Because previous reports suggest that the blue green algae, Aphanizomenon flos-aquae (AFA) can modulate immune function in animals, we sought to investigate the effects of AFA on human stem cells in cultures.
MATERIAL/METHODS:
Two AFA products were used for extraction: AFA whole (AFA-W) and AFA cellular concentrate (AFA-C). Water and ethanol extractions were performed to isolate active compounds for cell culture experiments. For cell proliferation analysis, human bone marrow cells or human CD34+ cells were cultured in 96 well plates and treated for 72 hours with various extracts. An MTT assay was used to estimate cellproliferation.
RESULTS:
We report here that the addition of an ethanol extract of AFA-cellular concentrate further enhances the stem cell proliferative action of NT-020 when incubated with human adult bone marrow cells or human CD34+ hematopoietic progenitors in culture. Algae extracts alone had only moderate activity in these stem cell proliferation assays.
CONCLUSIONS:
This preliminary study suggests that NT-020 plus the ethanol extract of AFA cellular concentrate may act to promote proliferation of human stem cell populations.
forrás: https://www.oncotarget.com/article/11108/text/
2021-11-19 11:49:59
A miricetin egy természetes étrendi flavonoid vegyület. Kiértékeltük a miricetin hatékonyságát a béldaganat kialakulására nézve adenómás polip coli multiplex bélrákos (APCMin/+) egereken. A miricetint szájon keresztül adagoltuk 12 egymást követő héten át naponta egyszer. A miricetinnel táplált (APCMin/+) egerekben kevesebb és kisebb polipok fejlődtek ki, mindennemű káros hatás nélkül. A szövetkórtani elemzés kimutatta, hogy csökkent a diszpláziás sejtek száma, valamint a diszplázia foka minden egyes polipban. Az immun-szövetkémiai és western blot analízis feltárta, hogy a miricetin szelektíven gátolja a sejtosztódást és apotózist vált ki az adenómás sejtekben. A miricetin hatásait összefüggésbe hozták a GSK-3β és a Wnt/β-c útvonalak modulálásával. az ELISA analízis a gyulladáskeltő citokineknek, az IL-6 és a PGE2-nek csökkent koncentrációját mutatták ki a vérben, ami az APCMin/+ egerekben viszont megemelkedett. A miricetines kezelés hatása sokkal kiemelkedőbb volt az adenómás polipokban, amelyek a vastagbélből eredtek. További kísérletek kimutatták, hogy a miricetin lefelé szabályozza a foszforilált p38 MAPK/Akt/mTOR jelző útvonalakat, amelyek lehetnek az adenómás polipok gátló mechanizmusai, melyet a miricetin váltott ki. Mindent összevetve a mi adataink azt mutatják, hogy a miricetin meggátolja a béldaganatok kialakulását egy sor biológiai hatáscsoport révén. Mivel ezek az eredmények adottak, azt javasoljuk, hogy a miricetint alkalmazni lehessen megelőzésképpen a bélrákfajták kialakulása kockázatának megelőzésére
