FURTHER OBSERVATIONS ON THE PATHOLOGICAL RESPONSES OF RAT SKELETAL MUSCLE TO TOXINS ISOLATED FROM THE VENOM OF THE AUSTRALIAN TIGER SNAKE, NOTECHIS SCUTATUS SCUTATUS
Article first published online: 28 JUN 2007
Clinical and Experimental Pharmacology and Physiology
Volume 5, Issue 6, pages 587–600, November 1978
How to Cite
Harris, J. B. and Johnson, M. A. (1978), FURTHER OBSERVATIONS ON THE PATHOLOGICAL RESPONSES OF RAT SKELETAL MUSCLE TO TOXINS ISOLATED FROM THE VENOM OF THE AUSTRALIAN TIGER SNAKE, NOTECHIS SCUTATUS SCUTATUS. Clinical and Experimental Pharmacology and Physiology, 5: 587–600. doi: 10.1111/j.1440-1681.1978.tb00714.x
- Issue published online: 28 JUN 2007
- Article first published online: 28 JUN 2007
- Received 12 July 1977; revision received 6 October 1977
- muscle pathology;
- notechis II-5;
- notechis II-l;
- snake toxin;
- tiger snake
1. Some aspects of the response of mammalian skeletal muscle following the injection of purified toxins from the venom of the Australian tiger snake, Notechis scutatus scutatus, are described.
2. The toxins used were notexin, notechis II-5, notechis II-1 and a modified form of notexin (PBP-notexin). They were injected into the dorso-lateral aspect of one hind limb so that the soleus muscle would be exposed to the toxins.
3. Within 1 h after the injection of notexin, the soleus muscles were oedematous and by 3–6 h, polymorphonuclear leucocytes had entered the interstitial spaces. The invasion of necrotic muscle fibres was extensive by this time. Muscle spindles appeared relatively unaffected by the toxin.
4. The muscle regenerated via myoblasts at 2–3 days to myotubes at 3–5 days, immature muscle fibres at 7–14 days and fully differentiated muscle fibres by 21–28 days. Even after 6 months, however, the nuclei of many muscle fibres remained in a central position.
5. A second component of Australian tiger snake venom was also found to be myotoxic. It was slightly less potent than notexin, but caused qualitatively similar damage to that caused by notexin. It was identified as notechis II-5. A third fraction, notechis II-l, was found to be inactive.
6. Notexin could be neutralized by incubation with tiger snake antivenene; the simultaneous injection of antivenene with notexin did not afford complete protection against muscle damage.