Yucca schidigera extract finds wide commercial application in foods, cosmetics and pharmaceuticals. In a previous paper we have found as the main constituents of yucca bark, yuccaol A, B and C, new and very unusual spiro-derivatives made up of a C-15 unit and a stilbenic portion closely related to resveratrol. This study was performed to examine whether yuccaol A, B or C (0.01 - 100 muM) could affect cytosolic inducible nitric oxide synthase (iNOS) protein expression and nitric oxide (NO) generation in vitro in Escherichia coli lipopolysaccharide (LPS)-activated J774.A1 macrophage cell line. NO production, detected as NO2-, increased significantly in LPS treated J774.A1 cells from 0.05 +/- 0.03 muM to 16.64 +/- 0.58 muM (P < 0.001). Yuccaol C (0.01-100 muM), added to the culture medium 1 h before LPS-stimulation, significantly (P < 0.001) and in a concentration related manner reduced NO release (P < 0.001) and iNOS protein expression (P < 0.05). In contrast, no inhibitory effect either on iNOS protein expression or on NO release was observed when yuccaol C was added after LPS stimulation. In contrast yuccaol A inhibited significantly (P < 0.001) only NO release at the highest concentration tested (100 muM) while yuccaol B did not reduce either NO release or iNOS expression. Yuccaol C was demonstrated to reduce iNOS protein expression via the transcription factor NF-kappaB. These results indicated that the empirical use of Y schidigera as anti-inflammatory remedy could be addressed not only to the resveratrol content but also to the presence of yuccaol C. (C) 2004 Elsevier Inc. All rights reserved.

Inhibition of inducible nitric oxide synthase expression by yuccaol C from Yucca schidigera roezl.

MARZOCCO, STEFANIA;PIACENTE, Sonia;PIZZA, Cosimo;PINTO, Aldo;AUTORE, Giuseppina
2004

Abstract

Yucca schidigera extract finds wide commercial application in foods, cosmetics and pharmaceuticals. In a previous paper we have found as the main constituents of yucca bark, yuccaol A, B and C, new and very unusual spiro-derivatives made up of a C-15 unit and a stilbenic portion closely related to resveratrol. This study was performed to examine whether yuccaol A, B or C (0.01 - 100 muM) could affect cytosolic inducible nitric oxide synthase (iNOS) protein expression and nitric oxide (NO) generation in vitro in Escherichia coli lipopolysaccharide (LPS)-activated J774.A1 macrophage cell line. NO production, detected as NO2-, increased significantly in LPS treated J774.A1 cells from 0.05 +/- 0.03 muM to 16.64 +/- 0.58 muM (P < 0.001). Yuccaol C (0.01-100 muM), added to the culture medium 1 h before LPS-stimulation, significantly (P < 0.001) and in a concentration related manner reduced NO release (P < 0.001) and iNOS protein expression (P < 0.05). In contrast, no inhibitory effect either on iNOS protein expression or on NO release was observed when yuccaol C was added after LPS stimulation. In contrast yuccaol A inhibited significantly (P < 0.001) only NO release at the highest concentration tested (100 muM) while yuccaol B did not reduce either NO release or iNOS expression. Yuccaol C was demonstrated to reduce iNOS protein expression via the transcription factor NF-kappaB. These results indicated that the empirical use of Y schidigera as anti-inflammatory remedy could be addressed not only to the resveratrol content but also to the presence of yuccaol C. (C) 2004 Elsevier Inc. All rights reserved.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11386/1065064
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