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Flosulide is a potent and selective COX-2 inhibitor, used for the treatment for inflammatory diseases.

Flosulide (1 nM-100 μM) causes a concentration-dependent and finally complete inhibition of PGE2 production in the OSC-2 cell line, but with no effect on PG formation in the OSC-1 cells. Flosulide completely suppresses mitotic activity of OSC-2 cells, whereas mitotic activity of OSC-1 cells remain unchanged[2].

In normovolemic rats, flosulide increases renal plasma flow (RPF) and and glomerular filtration rate (GFR). In hypovolemic rats, flosulide (5-25 mg/kg) reduces RPF and GFR. Flosulide at 5 mg/kg reduces 6-keto-PGF1alpha whereas at 25 mg/kg and after indomethacin at 10 mg/kg a fall in 6-keto-PGF1alpha and TXB2 appeares[1]. Flosulide (0.75 mg/day) significantly reduces proteinuria as compared to aspirin treatment. Plasma protein and albumin levels are significantly lower in the aspirin-treated group than in flosulide-treated rats[3].

[1]. Turull A, et al. Acute effects of the anti-inflammatory cyclooxygenase-2 selective inhibitor, flosulide, on renal plasma flow and glomerular filtration rate in rats. Inflammation. 2001 Apr;25(2):119-28. [2]. Zimmermann KC, et al. Cyclooxygenase-2 expression in human esophageal carcinoma. Cancer Res. 1999 Jan 1;59(1):198-204. [3]. Heise G, et al. Different actions of the cyclooxygenase 2 selective inhibitor flosulide in rats with passive Heymann nephritis. Nephron. 1998 Oct;80(2):220-6.

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