title: Enhanced production of camptothecin and biological preparation of N1-acetylkynuramine in Camptotheca acuminata cell suspension cultures.
abstract: The Camptotheca acuminata cell suspension cultures were established to produce the well-known antitumor monoterpene indole alkaloid camptothecin (CAM). Most CAM was present in the broth of the C. acuminata cell suspension cultures. The CAM production was evidenced to be attenuated when the C. acuminata cell suspension cultures were continuously subcultured and grown under identical axenic conditions. A practical cryopreservation and recovery procedure was established to maintain the C. acuminata cell suspension cultures. Biotic and abiotic elicitors were administrated to the C. acuminata cell suspension cultures to restore and enhance CAM production. Of them, sorbitol, a well-known hyperosmotic stressor, was proven to be the most effective elicitor that stimulates a ∼500-fold increase of CAM production. The committed biosynthetic precursors of CAM, tryptamine and secologanin, were feed to the C. acuminata cell suspension cultures and the CAM production is not remarkably increased. However, N1-acetylkynuramine (NAK), an important metabolite of kynuramine pathway, was isolated and identified from the cell suspension cultures feeding with tryptamine. The present work provides an efficient method to produce CAM and NAK using the C. acuminata cell suspension cultures. The biotransformation of tryptamine to NAK sheds lights on the biosynthetic formation of the pyrroloquinoline moiety of CAM.
authors.affiliation: Center for Natural Products Research, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu, 610041, People's Republic of China.|University of Chinese Academy of Sciences, Beijing, 100049, People's Republic of China.
authors.forename: Yun
authors.initials: Y
authors.lastname: Yang
authors.affiliation: Center for Natural Products Research, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu, 610041, People's Republic of China.|University of Chinese Academy of Sciences, Beijing, 100049, People's Republic of China.|College of Science, Sichuan Agricultural University, Ya'an, 625014, People's Republic of China.
authors.forename: Xiang
authors.initials: X
authors.lastname: Pu
authors.affiliation: Center for Natural Products Research, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu, 610041, People's Republic of China.|University of Chinese Academy of Sciences, Beijing, 100049, People's Republic of China.
authors.forename: Xixing
authors.initials: X
authors.lastname: Qu
authors.affiliation: Center for Natural Products Research, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu, 610041, People's Republic of China.|University of Chinese Academy of Sciences, Beijing, 100049, People's Republic of China.
authors.forename: Fei
authors.initials: F
authors.lastname: Chen
authors.affiliation: Center for Natural Products Research, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu, 610041, People's Republic of China.
authors.forename: Guolin
authors.initials: G
authors.lastname: Zhang
authors.affiliation: Center for Natural Products Research, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu, 610041, People's Republic of China. yinggluo@cib.ac.cn.|State Key Laboratory of Bioorganic and Natural Products Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai, 200032, People's Republic of China. yinggluo@cib.ac.cn.
authors.forename: Yinggang
authors.initials: Y
authors.lastname: Luo
mesh_terms: D000972:Antineoplastic Agents, Phytogenic / Q000032:analysis / Q000096:biosynthesis* / Q000302:isolation & purification; D061245:Axenic Culture; D029769:Camptotheca / Q000187:drug effects / Q000378:metabolism*; D002166:Camptothecin / Q000032:analysis / Q000096:biosynthesis* / Q000302:isolation & purification; D018929:Cell Culture Techniques; D015925:Cryopreservation; D003470:Culture Media / Q000737:chemistry; D057888:Iridoid Glucosides / Q000494:pharmacology; D007735:Kynuramine / Q000031:analogs & derivatives* / Q000737:chemistry / Q000378:metabolism; D013012:Sorbitol / Q000494:pharmacology; D014363:Tryptamines / Q000494:pharmacology
chemical_list: D000972:Antineoplastic Agents, Phytogenic; D003470:Culture Media; D057888:Iridoid Glucosides; D014363:Tryptamines; C021086:secologanin; D007735:Kynuramine; C030820:tryptamine; D013012:Sorbitol; D002166:Camptothecin
keywords: Camptotheca acuminata; Camptothecin; Cell suspension cultures; N 1-Acetylkynuramine; Sorbitol