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Family Asteraceae
Apanang-gubat
Eupatorium japonicum Thunb.
JAPANESE THOROUGH-WORT

Chen gan cao

Scientific names Common names
Eupatorium japonicum Thunb. Apanang-gubat (Tag.)
  Japanese thorough-wort (Engl.)
  Chen gan cao (Chin.)

Botany
Apanang-gubat is an erect, leafy branched, smooth herb, 60 to 90 meters high. Leaves are fragrant, up to 19 cm long, divided quite to the base into three segments - the upper leaves subtending the branches of the inflorescence being deeply divided. Segments are elliptic-lanceolate or elliptic-ovate, up to 13 cm long, pointed at both ends, and toothed at the margins. Inflorescence is terminal, measuring up to 14 cm across. Flowering heads are fragrant, 3 to 4 mm across. Flowers are white and fragrant.

Distribution
- In thickets at low altitudes in the Batan Islands.
- Occurs in Japan to China and Taiwan.

Toxicity
Contains pyrrolizidine alkaloids. This class of hepatotoxic and tumorigenic compounds have been detected in herbal plants and dietary supplements.

Parts used
Leaves

Uses

Folkloric
Leaves used as diuretic and anthelmintic.
Also used as tea for indigestion.


Studies
Pyrrolizidine Alkaloids:
Study on the pyrrolizidine alkaloid composition of three Chinese herbs (E. cannabinum, E. japonicum and Crotolaria assamica) yielded viridiflorine, cynaustraline, amabiline, supinine, echinatine, rinderine and isomers of these alkaloids were found in the Eupatorium species.
Hepatotoxicity: Study concludes the alkaloid in Eupatorium species is metabolized to "pyrrole" and an N-oxide metabolite in the liver, but the hepatotoxicity is much lower when compared to that caused by Crotolaria.
Pyrrolizidine Alkaloids / Hepatotoxic ands Tumorigenic: Studies have indicated that pyrrolizidine alkaloids induce tumores via a genotoxic mechanism mediated by 6,7-dihydro-7-hydroxy-1-hydroxymethyl-5H-pyrrolizine(DHP)-derived DNA adduct formation.

Availability
Wild-crafted.
Extracts and supplements in the cybermarket.

March 2011

IMAGE SOURCE: File:Eupatorium japonicum3.jpg / KENPEI / 20 Oct 2007/ Wikimedia Commons

Additional Sources and Suggested Readings
(1)
Pyrrolizidine alkaloid composition of three Chinese medicinal herbs, Eupatorium cannabinum, E. japonicum and Crotalaria assamica / Edgar JA, Lin HJ et al /
Am J Chin Med. 1992;20(3-4):281-8.
(2)
A comparative study on the hepatic toxicity and metabolism of Crotalaria assamica and Eupatorium species / Chan MY, Zhao XL, Ogle CW /
Am J Chin Med. 1989;17(3-4):165-70.
(3)
Pyrrolizidine Alkaloids - Tumorigenic Components in Chinese Herbal Medicines and Dietary Supplements / Peter P Fu, Ya-Chen Yang et al / Journal of Food and Drug Analysis, Vol. 10, No. 4, 2002, Pages 198-211


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