| 12553890 |
Lee HS: Inhibitory activity of Cinnamomum cassia bark-derived component against rat lens aldose reductase. J Pharm Pharm Sci. 2002 Sep-Dec;5(3):226-30.
PURPOSE: To evaluate the inhibitory activity of active compounds isolated from Cinnamomum cassia bark against lens aldose reductase and compare to that of three commercially available compounds (cinnamyl alcohol, trans -cinnamic acid, and eugenol) and quercitrin as aldose reductase inhibitors. The IC (50) value of cinnamaldehyde was determined. METHODS: Active compound was purified on repeated silica gel column and HPLC (Waters Delta Prep 4000). Aldose reductase was prepared from lenses of Sprague-Dawley male rat eyes. The incubation mixture contained 135 mM Na, K-phosphate buffer (pH 7.0), 100 mM lithium sulfate, 0.03 mM NADPH, 0.04 mM DL-glyceraldehyde and 50 micro L of an enzyme preparation, with or without a plant extract. The reaction was initiated by adding NADPH at 37 degrees C and stopped by adding 0.5 N hydrochloric acid. Subsequently, 6 N NaOH containing 10 mM imidazole was added, and the mixture was incubated at 60 degrees C for 10 min to convert NADP into a fluorescent product. The fluorescence was measured with a spectrofluorophotometer. RESULTS: The biologically active constituents of C. cassia extract against lens aldose reductase were characterized as trans -cinnamaldehyde by spectral analysis. The IC (50) value of cinnamaldehyde is 0.003 mg/mL. However, cinnamyl alcohol, trans -cinnamic acid and eugenol exhibited only weak inhibition against aldose reductase. In comparison, quercitrin was 6 times more potent than cinnamaldehyde. CONCLUSIONS: These results suggest that cinnamaldehyde isolated from C. cassia barks may be useful as a lead compound and a medicinal foodstuff for aldose reductase inhibition. |
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