alexa An ethanol extract of Piper betle Linn. mediates its anti-inflammatory activity via down-regulation of nitric oxide.
Nutrition

Nutrition

Journal of Nutrition & Food Sciences

Author(s): Ganguly S, Mula S, Chattopadhyay S, Chatterjee M

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Abstract The leaves of Piper betle (locally known as Paan) have long been in use in the Indian indigenous system of medicine for the relief of pain; however, the underlying molecular mechanisms of this effect have not been elucidated. The anti-inflammatory and immunomodulatory effects of an ethanolic extract of the leaves of P. betle (100 mg kg(-1); PB) were demonstrated in a complete Freund's adjuvant-induced model of arthritis in rats with dexamethasone (0.1 mg kg(-1)) as the positive control. At non-toxic concentrations of PB (5-25 microg mL(-1)), a dose-dependent decrease in extracellular production of nitric oxide in murine peritoneal macrophages was measured by the Griess assay and corroborated by flow cytometry using the nitric oxide specific probe, 4,5-diaminofluorescein-2 diacetate. This decreased generation of reactive nitrogen species was mediated by PB progressively down-regulating transcription of inducible nitric oxide synthase in macrophages, and concomitantly causing a dose-dependent decrease in the expression of interleukin-12 p40, indicating the ability of PB to down-regulate T-helper 1 pro-inflammatory responses. Taken together, the anti-inflammatory and anti-arthrotic activity of PB is attributable to its ability to down-regulate the generation of reactive nitrogen species, thus meriting further pharmacological investigation. This article was published in J Pharm Pharmacol and referenced in Journal of Nutrition & Food Sciences

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