Novel toxins produced by the dinoflagellate Karenia brevisulcata

被引：29

作者：

Holland, Patrick T. ^{[1
]}

Shi, Feng ^{[2
]}

Satake, Masayuki ^{[3
]}

Hamamoto, Yuka ^{[3
]}

Ito, Emiko ^{[4
]}

Beuzenberg, Veronica ^{[1
]}

McNabb, Paul ^{[1
]}

Munday, Rex ^{[5
]}

Briggs, Lyn ^{[5
]}

Truman, Penelope ^{[6
]}

Gooneratne, Ravi ^{[2
]}

Edwards, Patrick ^{[7
]}

Pascal, Steven M. ^{[7
]}

机构：

[1] Cawthron Inst, Nelson 7010, New Zealand

[2] Lincoln Univ, Canterbury 7647, New Zealand

[3] Univ Tokyo, Dept Chem, Tokyo 1130033, Japan

[4] Chiba Univ, Med Mycol Res Ctr, Chuo Ku, Chiba 2608673, Japan

[5] AgResearch, Ruakura Res Ctr, Hamilton 3240, New Zealand

[6] Environm Sci & Res, Porirua 5240, New Zealand

[7] Massey Univ, Inst Fundamental Sci, Palmerston North, New Zealand

来源：

HARMFUL ALGAE | 2012年 / 13卷

关键词：

Brevetoxins; Brevisulcatic acids; BSX; Karenia brevisulcata; KBT; Toxic dinoflagellate; SP-NOV GYMNODINIALES; NEW-ZEALAND SHELLFISH; MARINE DINOFLAGELLATE; WELLINGTON HARBOR; BREVETOXIN ANALOG; ALGAL BLOOM; AUSTROVENUS-STUTCHBURYI; NEUROBLASTOMA ASSAY; GREENSHELL MUSSELS; PERNA-CANALICULUS;

D O I：

10.1016/j.hal.2011.10.002

中图分类号：

Q17 [水生生物学];

学科分类号：

071004 ;

摘要：

Karenia brevisulcata (Chang), a new toxic dinoflagellate of the genus Karenia was isolated from a harmful algal bloom that occurred in Wellington Harbour, New Zealand in 1998. The bloom severely affected most marine biota resulting in long-term ecological damage and causing respiratory distress in harbour bystanders. Cultures of K. brevisulcata produced a range of novel toxins including ten lipid-soluble K. brevisulcata toxins (KBTs) and six water-soluble brevisulcatic acids (BSXs). Brevetoxins were not detected. KBT-F, KBT-G, BSX-1 and BSX-2 were isolated from 1450 L of bulk cultures and purified in mg quantities. Preliminary chemical and toxicological investigations show that KBT-F (M 2054 C107H160O38) and KBT-G (M 2084 C108H162O39) are complex polycyclic ethers with UVmax at 227 nm. NMR data gave characteristics of ladder frame polyether structures and a 2-methylbut-2-enal side chain, similar to gymnocins. The mouse i.p. LD(50)s for KBT-F and -G were 0.032 and 0.040 mg kg(-1), respectively. These KBTs were also highly cytotoxic and haemolytic. BSX-1 (M 916 C49H72O16) and BSX-2 (M 872 C47H68O15) are polycyclic ether dicarboxylates with UVmax 196 nm. BSX-4 and BSX-5, the lactone ring-closed analogues and the presumed primary toxins in the algal cells, were isolated in smaller quantities. Preliminary structural information from NMR and MS showed a carboxylated side chain and some similarities to brevetoxin-A. However, the structures have not yet been fully elucidated due to conformers confounding the NMR. The mouse i.p. LD50 for BSX-1 was 3.9 mg kg(-1) while no deaths were seen in mice injected with BSX-2 at 6.6 mg kg(-1). The LD(50)s for the lactones BSX-4 and -5 were 1.4 and 1.6 mg kg(-1) respectively. BSX-4 and -5 were agonists of voltage-gated sodium channels but only weakly haemolytic. Activities in the Neuro-2a cytotoxicity assay were ca 10% of dihydrobrevetoxin-2 and were fully antagonised by saxitoxin. (C) 2011 Elsevier B.V. All rights reserved.

引用

页码：47 / 57

页数：11

共 60 条

[1] Characterization of polar brevetoxin derivatives isolated from Karenia brevis cultures and natural blooms [J].