Atranorin

Atranorin is a depside lichen metabolite that has been found in S. alpinum and has diverse biological activities.^1,2,3,4 It is active against the bacteria B. cereus, B. subtilis, S. aureus, S. faecalis, P. vulgaris, L. monocytogenes, and A. hydrophila (MICs = 1.67, 0.38, 26.7, 13.4, 3.34, 9.83, and 1.67 mM, respectively), the fungi C. albicans and C. glabrata (MIC = 26.7 mM for both), as well as the mycobacterium M. aurum (MIC = 250 µg/ml).^1,2 Atranorin is cytotoxic to A270, HL-60, and Jurkat cancer cells (IC₅₀s = 197.9, 93.5, and 181.6 µM, respectively) but not HeLa, MCF-7, SK-BR-3, or HT-29 cancer cells (IC₅₀s = >200 µM).³ It inhibits acetic acid-induced writhing in mice when administered orally at doses of 200 and 400 mg/kg.⁴ Atranorin (200 and 400 mg/kg, p.o.) also reduces paw licking and biting in the second, but not first, phase of the formalin test when administered 30 minutes prior to formalin in mice.

WARNING This product is not for human or veterinary use.

1. Ingólfsdóttir, K., Chung, G.A., Skúlason, V.G., et al. Antimycobacterial activity of lichen metabolites in vitro. Eur. J. Pharm. Sci. 6(2), 141-144 (1998).

2. Yilmaz, M., Türk, A.O., Tay, T., et al. The antimicrobial activity of extracts of the lichen Cladonia foliacea and its (–)-usnic acid, atranorin, and fumarprotocetraric acid constituents. Z. Naturforsch. C. J. Biosci. 59(3-4), 249-254 (2004).

3. Bačkorová, M., Bačkor, M., Mikeš, J., et al. Variable responses of different human cancer cells to the lichen compounds parietin, atranorin, usnic acid and gyrophoric acid. Toxicol. In Vitro 25(1), 37-44 (2011).

4. Melo, M.G.D., Araújo, A.A.S., Rocha, C.P.L., et al. Purification, physicochemical properties, thermal analysis and antinociceptive effect of atranorin extracted from Cladina kalbii. Biol. Pharm. Bull. 31(10), 1977-1980 (2008).