title: Cytotoxic activity of four xanthones from Emericella variecolor, an endophytic fungus isolated from Croton oblongifolius.
abstract: Four xanthones were isolated from mycelia of Emericella variecolor, an endophytic fungus isolated from the leaves of Croton oblongifolius. Their structures were elucidated by spectroscopic analysis to be shamixanthone, 14-methoxytajixanthone-25-acetate, tajixanthone methanoate, and tajixanthone hydrate. All compounds were tested for cytotoxic activity against various human tumor cell lines including gastric carcinoma, colon carcinoma, breast carcinoma, human hepatocarcinoma, and lung carcinoma. The antitumor activities of these xanthones were compared with that of doxorubicin hydrochloride, a chemotherapeutic substance. All of them showed moderate activities and were selective against gastric carcinoma, colon carcinoma, and breast carcinoma. Only tajixanthone hydrate exhibited moderate activity against all cancer cell lines. Furthermore, under the test conditions it was found that 14-methoxytajixanthone-25-acetate and tajixanthone hydrate are almost as active as doxorubicin hydrochloride against gastric carcinoma (KATO3) and breast carcinoma (BT474).
authors.affiliation: Research Centre for Bioorganic Chemistry, Department of Chemistry, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand. psuracha@chula.ac.th
authors.forename: Surachai
authors.initials: S
authors.lastname: Pornpakakul
authors.forename: Jatupol
authors.initials: J
authors.lastname: Liangsakul
authors.forename: Nattaya
authors.initials: N
authors.lastname: Ngamrojanavanich
authors.forename: Sophon
authors.initials: S
authors.lastname: Roengsumran
authors.forename: Prakitsin
authors.initials: P
authors.lastname: Sihanonth
authors.forename: Jittra
authors.initials: J
authors.lastname: Piapukiew
authors.forename: Ek
authors.initials: E
authors.lastname: Sangvichien
authors.forename: Songchan
authors.initials: S
authors.lastname: Puthong
authors.forename: Amorn
authors.initials: A
authors.lastname: Petsom
mesh_terms: D000970:Antineoplastic Agents / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology*; D045744:Cell Line, Tumor; D029802:Croton / Q000382:microbiology*; D004305:Dose-Response Relationship, Drug; D032842:Emericella / Q000737:chemistry* / Q000302:isolation & purification; D006801:Humans; D020128:Inhibitory Concentration 50; D018515:Plant Leaves / Q000382:microbiology; D044004:Xanthones / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology*
chemical_list: D000970:Antineoplastic Agents; D044004:Xanthones