Please use this identifier to cite or link to this item:
Title: Isolation and pharmacological characterization of a phospholipase A 2 myotoxin from the venom of the Irian Jayan death adder (Acanthophis rugosus)
Authors: Wickramaratna, J.C.
Fry, B.G. 
Aguilar, M.-I.
Kini, R.M. 
Hodgson, W.C.
Keywords: Acanmyotoxin-1
Death adder
Phospholipase A 2
Issue Date: Jan-2003
Citation: Wickramaratna, J.C., Fry, B.G., Aguilar, M.-I., Kini, R.M., Hodgson, W.C. (2003-01). Isolation and pharmacological characterization of a phospholipase A 2 myotoxin from the venom of the Irian Jayan death adder (Acanthophis rugosus). British Journal of Pharmacology 138 (2) : 333-342. ScholarBank@NUS Repository.
Abstract: 1 It has long been thought that death adder venoms are devoid of myotoxic activity based on studies done on Acanthophis antarcticus (Common death adder) venom. However, a recent clinical study reported rhabdomyolysis in patients following death adder envenomations, in Papua New Guinea, by a species thought to be different to A. antarcticus. Consequently, the present study examined A. rugosus (Irian Jayan death adder) venom for myotoxicity, and isolated the first myotoxin (acanmyotoxin-1) from a death adder venom. 2 A. rugosus (10-50 μg ml -1) and acanmyotoxin-1 (MW 13811; 0.1-1 μM) were screened for myotoxicity using the chick directly (0.1 Hz, 2 ms, supramaximal V) stimulated biventer cervicis nerve-muscle (CBCNM) preparation. A significant contracture of skeletal muscle and/or inhibition of direct twitches were considered signs of myotoxicity. This was confirmed by histological examination. 3 High phospholipase A 2 (PLA 2) activity was detected in both A. rugosus venom (140.2±10.4 μmol min -1 mg -1; n=6) and acanmyotoxin-1 (153.4±11 μmol min -1 mg -1; n=6). Both A. rugosus venom (10-50 μg ml -1) and acanmyotoxin-1 (0.1-1 μM) caused dose-dependent inhibition of direct twitches and increase in baseline tension (n=4-6). In addition, dose-dependent morphological changes in skeletal muscle were observed. 4 Prior incubation (10 min) of CSL death adder antivenom (5 units ml -1; n=4) or inactivation of PLA 2 activity with 4-bromophenacyl bromide (1.8 mM; n=4) prevented the myotoxicity caused by acanmyotoxin-1 (1 μM). 5 Acanmyotoxin-1 (0.1 μM; n=4) displayed no significant neurotoxicity when it was examined using the indirectly (0.1 Hz, 0.2 ms, supramaximal V) stimulated CBCNM preparation. 6 In conclusion, clinicians may need to be mindful of possible myotoxicity following death adder envenomation in Irian Jaya.
Source Title: British Journal of Pharmacology
ISSN: 00071188
DOI: 10.1038/sj.bjp.0705046
Appears in Collections:Staff Publications

Show full item record
Files in This Item:
There are no files associated with this item.


checked on Jul 18, 2019


checked on Jul 9, 2019

Page view(s)

checked on Jul 20, 2019

Google ScholarTM



Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.