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• W2163905903 endingPage "1078" @default.
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• W2163905903 abstract "Mesalamine (5-aminosalicylate acid, 5-ASA) is an effective treatment for ulcerative colitis (UC). The mechanisms of its actions are not fully understood. Because angiogenesis is critical for healing UC, we examined whether 5-ASA alters the angiogenic balance between angiogenic factors [e.g., vascular endothelial growth factor (VEGF)] and antiangiogenic factors (e.g., endostatin and angiostatin) in the colon in experimental UC. Rats were treated with saline or 5-ASA (100 mg/kg) twice daily and euthanized 3 or 7 days after iodoacetamide-induced UC. Clinical signs (e.g., lethargy, diarrhea) and UC lesions were measured. Expression of VEGF, endostatin, angiostatin, tissue necrosis factor alpha (TNF-alpha), and matrix metalloproteinases (MMPs) 2 and 9 was determined by Western blots, enzyme-linked immunosorbent assay, and zymography in the distal colon. 5-ASA treatment reduced lethargy and diarrhea and significantly decreased colonic lesions (by approximately 50%) compared with saline treatment in UC (both, P < 0.05). 5-ASA did not reverse the increased levels of VEGF, but it significantly reduced expression of endostatin and angiostatin in UC compared with vehicle treatment (both, P < 0.05). Furthermore, 5-ASA treatment significantly diminished increased activity of TNF-alpha and MMP9 in UC. This is the first demonstration that 5-ASA treatment reverses an imbalance between the angiogenic factor VEGF and antiangiogenic factors endostatin and angiostatin in experimental UC. The effect of 5-ASA in UC may be caused by the down-regulation of expression of endostatin and angiostatin by modulation of MMP2 and MMP9 via inhibition of TNFalpha. The inhibition of antiangiogenic factors may represent a novel molecular mechanism of the therapeutic action of 5-ASA." @default.
• W2163905903 created "2016-06-24" @default.
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• W2163905903 date "2009-09-17" @default.
• W2163905903 modified "2023-10-16" @default.
• W2163905903 title "Mesalamine Restores Angiogenic Balance in Experimental Ulcerative Colitis by Reducing Expression of Endostatin and Angiostatin: Novel Molecular Mechanism for Therapeutic Action of Mesalamine" @default.
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• W2163905903 doi "https://doi.org/10.1124/jpet.109.158022" @default.
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