title: Marine two-headed sphingolipid-like compound rhizochalin inhibits EGF-induced transformation of JB6 P+ Cl41 cells.
abstract: Rhizochalin [(2R,3R,26R,27R)-2,27-diamino-3-hydroxy-26-[(2R,3R,4S,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)tetrahydro-2H-pyran-2-yloxy]octacosan-11-one], an antimicrobial and cytotoxic marine two-headed sphingolipid-like natural product, isolated from the sponge Rhizochalina incrustata, and some related compounds were studied as anticarcinogenic and proapoptotic agents. The corresponding effects were tested on the mouse skin epidermal JB6 P(+) Cl 41 cell line, its stable transfectants, THP-1, HeLa, and SNU-C4 human tumor cells using a variety of assessments, including cell viability (MTS), flow cytometry, anchorage-independent soft agar, and luciferase assays. At 5-10 muM concentrations, rhizochalin was effective as an inhibitor of the malignant transformation of JB6 P(+) Cl 41 cells or colony formation of human tumor cells, which exerted its action, at least in part, through the induction of p53-dependent apoptosis. Structure-activity relationship study showed aglycon of rhizochalin to be the most active while peracetylated aglycon was the least active among the compounds studied.
authors: Pacific Institute of Bioorganic Chemistry, Vladivostok, 690022, Russian Federation. fedorov@piboc.dvo.ru
authors: Sergey N
authors: SN
authors: Fedorov
authors: Tatyana N
authors: TN
authors: Makarieva
authors: Alla G
authors: AG
authors: Guzii
authors: Larisa K
authors: LK
authors: Shubina
authors: Jong Y
authors: JY
authors: Kwak
authors: Valentin A
authors: VA
authors: Stonik
mesh_terms: D000818:Animals; D016588:Anticarcinogenic Agents / Q000302:isolation & purification / Q000494:pharmacology*; D017209:Apoptosis / Q000187:drug effects*; D045744:Cell Line, Tumor; D002471:Cell Transformation, Neoplastic / Q000187:drug effects*; D005233:Fatty Alcohols / Q000302:isolation & purification / Q000494:pharmacology*; D006027:Glycosides / Q000302:isolation & purification / Q000494:pharmacology*; D006801:Humans; D007938:Leukemia / Q000188:drug therapy; D051379:Mice; D011161:Porifera / Q000737:chemistry*; D016159:Tumor Suppressor Protein p53 / Q000378:metabolism
chemical_list: D016588:Anticarcinogenic Agents; D005233:Fatty Alcohols; D006027:Glycosides; D016159:Tumor Suppressor Protein p53; C068290:rhizochaline