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Xanthopterin, an unconjugated pteridine compound, is the main component of the yellow granule in the Oriental hornet bear wings, produces a characteristic excitation/emission maximum at 386/456 nm[2]. Xanthopterin (XPT) causes renal growth and hypertrophy in rat[1].Xanthopterin inhibits RNA synthesis[4].

Xanthopterin (7.8-250 mM; 24 hours) show a significant reduction in mitochondrial activity with respect to controls (IC50=109 mM)[2]. Cell Viability Assay[2] Cell Line: MCF-7 cells

[1]. Xanthopterin (XPT), an unconjugated pteridine compound, affects cell growth and differentiation. When injected into rats, XPT has caused changes that have been interpreted as renal growth and hypertrophy. [2]. Lord JL, et al. Cytotoxicity of xanthopterin and isoxanthopterin in MCF-7 cells. Cancer Lett. 2005 May 10;222(1):119-24. [3]. Plotkin M, et al. Xanthopterin in the Oriental hornet (Vespa orientalis): light absorbance is increased with maturation of yellow pigment granules. Photochem Photobiol. 2009 Jul-Aug;85(4):955-61. [4]. Ziegler I, et al. Pterins and the regulation of lymphocyte activation on the mode of xanthopterin action. Hoppe Seylers Z Physiol Chem. 1984 Jun;365(6):667-73.

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