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Smad AND Quercetin

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https://www.readbyqxmd.com/read/27151496/isorhamnetin-attenuates-liver-fibrosis-by-inhibiting-tgf-%C3%AE-smad-signaling-and-relieving-oxidative-stress
#1
Ji Hye Yang, Sang Chan Kim, Kyu Min Kim, Chang Ho Jang, Sam Seok Cho, Seung Jung Kim, Sae Kwang Ku, Il Je Cho, Sung Hwan Ki
Hepatic fibrosis is considered integral to the progression of chronic liver diseases, leading to the development of cirrhosis and hepatocellular carcinoma. Activation of hepatic stellate cells (HSCs) is the dominant event in hepatic fibrogenesis. We investigated the ability of isorhamnetin, the 3'-O-methylated metabolite of quercetin, to protect against hepatic fibrosis in vitro and in vivo. Isorhamnetin inhibited transforming growth factor (TGF)-β1-induced expression of α-smooth muscle actin (α-SMA), plasminogen activator inhibitor-1 (PAI-1), and collagen in primary murine HSCs and LX-2 cells...
July 15, 2016: European Journal of Pharmacology
https://www.readbyqxmd.com/read/27052477/quercetin-inhibits-fibroblast-activation-and-kidney-fibrosis-involving-the-suppression-of-mammalian-target-of-rapamycin-and-%C3%AE-catenin-signaling
#2
Jiafa Ren, Jianzhong Li, Xin Liu, Ye Feng, Yuan Gui, Junwei Yang, Weichun He, Chunsun Dai
Quercetin, a flavonoid found in a wide variety of plants and presented in human diet, displays promising potential in preventing kidney fibroblast activation. However, whether quercetin can ameliorate kidney fibrosis in mice with obstructive nephropathy and the underlying mechanisms remain to be further elucidated. In this study, we found that administration of quercetin could largely ameliorate kidney interstitial fibrosis and macrophage accumulation in the kidneys with obstructive nephropathy. MTORC1, mTORC2, β-catenin as well as Smad signaling were activated in the obstructive kidneys, whereas quercetin could markedly reduce their abundance except Smad3 phosphorylation...
2016: Scientific Reports
https://www.readbyqxmd.com/read/26051872/taxifolin-protects-against-cardiac-hypertrophy-and-fibrosis-during-biomechanical-stress-of-pressure-overload
#3
Haipeng Guo, Xin Zhang, Yuqian Cui, Heng Zhou, Dachun Xu, Tichao Shan, Fan Zhang, Yuan Guo, Yuguo Chen, Dawei Wu
Cardiac hypertrophy is a key pathophysiological component to biomechanical stress, which has been considered to be an independent and predictive risk factor for adverse cardiovascular events. Taxifolin (TAX) is a typical plant flavonoid, which has long been used clinically for treatment of cardiovascular and cerebrovascular diseases. However, very little is known about whether TAX can influence the development of cardiac hypertrophy. In vitro studies, we found that TAX concentration-dependently inhibited angiotensin II (Ang II) induced hypertrophy and protein synthesis in cardiac myocytes...
September 1, 2015: Toxicology and Applied Pharmacology
https://www.readbyqxmd.com/read/25108658/beneficial-effect-of-quercetin-on-cholestatic-liver-injury
#4
Shih-Yi Lin, Ya-Yu Wang, Wen-Ying Chen, Yu-Han Chuang, Pin-Ho Pan, Chun-Jung Chen
Bile duct obstruction and subsequent cholestasis are associated with hepatocellular injury, cholangiocyte proliferation, stellate cell activation, Kupffer cell activation, oxidative stress, inflammation and fibrosis. Flavonoids have been shown to confer beneficial health effects, including hepatoprotection. However, the molecular mechanism of flavonoid-mediated hepatoprotection is incompletely understood. In this study, we report the protective effect of quercetin on cholestatic liver injury. Cholestasis was produced by bile duct ligation (BDL) in male Sprague-Dawley rats for 3 weeks...
November 2014: Journal of Nutritional Biochemistry
https://www.readbyqxmd.com/read/24680176/tumor-suppression-effects-of-bilberry-extracts-and-enzymatically-modified-isoquercitrin-in-early-preneoplastic-liver-cell-lesions-induced-by-piperonyl-butoxide-promotion-in-a-two-stage-rat-hepatocarcinogenesis-model
#5
Shintaro Hara, Reiko Morita, Takashi Ogawa, Risa Segawa, Norifumi Takimoto, Kazuhiko Suzuki, Naobumi Hamadate, Shim-Mo Hayashi, Ayano Odachi, Isao Ogiwara, Sakae Shibusawa, Toshinori Yoshida, Makoto Shibutani
To investigate the protective effect of bilberry extracts (BBE) and enzymatically modified isoquercitrin (EMIQ) on the hepatocarcinogenic process involving oxidative stress responses, we used a two-stage hepatocarcinogenesis model in N-diethylnitrosamine-initiated and piperonyl butoxide (PBO)-promoted rats. We examined the modifying effect of co-administration with BBE or EMIQ on the liver tissue environment including oxidative stress responses, cell proliferation and apoptosis, and phosphatase and tensin homolog (PTEN)/Akt and transforming growth factor (TGF)-β/Smad signalings on the induction mechanism of preneoplastic lesions during early stages of hepatocellular tumor promotion...
August 2014: Experimental and Toxicologic Pathology: Official Journal of the Gesellschaft Für Toxikologische Pathologie
https://www.readbyqxmd.com/read/22915297/quercetin-treatment-ameliorates-inflammation-and-fibrosis-in-mice-with-nonalcoholic-steatohepatitis
#6
Eder Marcolin, Beatriz San-Miguel, Daniela Vallejo, Juliana Tieppo, Norma Marroni, Javier González-Gallego, María J Tuñón
We investigated whether quercetin protects from steatosis and limits the expression of proinflammatory and fibrogenic genes in C57BL/6J mice with nonalcoholic steatohepatitis (NASH) induced by feeding a methionine-choline-deficient (MCD) diet. Quercetin (50 mg/kg) was given by oral route daily. Mice were randomly divided into 4 groups that received for 2 or 4 wk: the control diet plus vehicle, control diet plus quercetin, MCD diet plus vehicle, and MCD diet plus quercetin. At both 2 and 4 wk, feeding the MCD diet resulted in liver steatosis, inflammatory cell accumulation, oxidative stress evaluated by the concentration of TBARS, and fibrosis evidenced by the staining of α-smooth muscle actin-positive cells in the liver...
October 2012: Journal of Nutrition
https://www.readbyqxmd.com/read/21769418/quercetin-a-potent-suppressor-of-nf-%C3%AE%C2%BAb-and-smad-activation-in-osteoblasts
#7
Masayoshi Yamaguchi, M Neale Weitzmann
Osteoclasts, the bone resorbing cells of the body, form when osteoclast precursors are exposed to the key osteoclastogenic cytokine receptor activator of NF-κB ligand (RANKL), a process requiring induction of NF-κB signaling. Quercetin is a ubiquitous plant-derived flavonoid with well documented anti-inflammatory properties, in part, a consequence of its capacity to downmodulate the NF-κB signal transduction pathway. Consistent with this mechanism of action quercetin is reported to suppress osteoclastogenesis in vitro and prevent bone loss in ovariectomized mice in vivo...
October 2011: International Journal of Molecular Medicine
https://www.readbyqxmd.com/read/21605637/in-vitro-suppression-of-quercetin-on-hypertrophy-and-extracellular-matrix-accumulation-in-rat-glomerular-mesangial-cells-cultured-by-high-glucose
#8
Dao-quan Tang, Ya-qin Wei, Xiao-xing Yin, Qian Lu, Hui-hui Hao, Yun-peng Zhai, Jian-yun Wang, Jin Ren
Quercetin's protective effects on the glomerulosclerosis of diabetic nephropathy (DN) in rat mesangial cells were investigated. The cell cycles, type IV collagen and laminin, TGF-β(1) mRNA, Smad 2/3 and Smad 7, and activities of cell antioxidases were measured. Compared with the high glucose group, quercetin may decrease the cell percentages of G(0)/G(1) phase, Smad 2/3 expression, laminin and type IV collagen, and TGF-β(1) mRNA level significantly. The antioxidant capacity, the cell percentages of S phase and Smad 7 expression was significantly increased by quercetin...
September 2011: Fitoterapia
https://www.readbyqxmd.com/read/21216973/attenuation-of-transforming-growth-factor-%C3%AE-stimulated-collagen-production-in-fibroblasts-by-quercetin-induced-heme-oxygenase-1
#9
Toshinobu Nakamura, Miyoko Matsushima, Yuta Hayashi, Masataka Shibasaki, Kazuyoshi Imaizumi, Naozumi Hashimoto, Kaoru Shimokata, Yoshinori Hasegawa, Tsutomu Kawabe
Quercetin is a flavonoid with a wide variety of cytoprotective and modulatory functions. Heme oxygenase-1 (HO-1) is an inducible enzyme. Its reaction product, carbon monoxide (CO), confers cellular protection in a number of conditions and diseases associated with oxidative or inflammatory lung injury. Furthermore, quercetin was reported to be a potent inducer of HO-1 in several cell types. We hypothesized that quercetin suppresses the production of collagen in fibroblasts via the induction of HO-1. Here, we showed that quercetin suppresses transforming growth factor-β (TGF-β)-induced collagen production in NIH3T3 cells and in normal human lung fibroblasts...
May 2011: American Journal of Respiratory Cell and Molecular Biology
https://www.readbyqxmd.com/read/15580028/suppression-of-transforming-growth-factor-beta-smad-signaling-in-keloid-derived-fibroblasts-by-quercetin-implications-for-the-treatment-of-excessive-scars
#10
Toan-Thang Phan, Ivor Jiun Lim, Sui-Yung Chan, Ee-Kim Tan, Seng-Teik Lee, Michael T Longaker
BACKGROUND: Keloids are characterized by abnormal proliferation and overproduction of extracellular matrix. Quercetin, a dietary compound, has strong antioxidant and anticancer properties. Previous studies by the authors have shown that quercetin inhibits fibroblast proliferation, collagen production, and contraction of keloid and hypertrophic scar-derived fibroblasts. Quercetin also blocks the signal transduction of insulin-like growth factor-1 in keloid fibroblasts. This study assessed the effects of quercetin on the transforming growth factor (TGF)-beta/Smad-signaling pathway in keloid-derived fibroblasts, which may be an important biologic mechanism of this proliferative scarring...
November 2004: Journal of Trauma
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