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To investigate the anti-diabetogenic mechanism of Nardostachys jatamansi extract (NJE).
Mice were injected with streptozotocin via a tail vein to induce diabetes. Rat insulinoma RINm5F cells and isolated rat islets were treated with interleukin-1beta and interferon-gamma to induce cytotoxicity.
Treatment of mice with streptozotocin resulted in hyperglycemia and hypoinsulinemia, which was confirmed by immunohistochemical staining of the islets. The diabetogenic effects of streptozotocin were completely abolished when mice were pretreated with NJE. Inhibition of streptozotocin-induced hyperglycemia by NJE was mediated by suppression of nuclear factor (NF)-kappaB activation. In addition, NJE protected against cytokine-mediated cytotoxicity. Incubation of RINm5F cells and islets with NJE resulted in a significant reduction in cytokine-induced NF-kappaB activation and downstream events, inducible nitric oxide synthase expression and nitric oxide production. The protective effect of NJE was further demonstrated by the normal insulin secretion of cytokine-treated islets in response to glucose.
NJE provided resistance to pancreatic beta-cell damage from cytokine or streptozotocin treatment. The beta-cell protective effect of NJE is mediated by suppressing NF-kappaB activation.
Department of Biochemistry, Medical School and Diabetes Research Center, Chonbuk National University, Jeonju, Jeonbuk 561-756, South Korea.
This article was published in the following journal.
Name: World journal of gastroenterology : WJG
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A plant genus of the family VALERIANACEAE. Nardostachysin, nardostachin, nardosinone, valeranone, and patchoulene have been found in this genus. Nardostachys jatamansi is classified by some as Valeriana jatamansi.
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