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Inflammation induced by snake venoms optimizes envenomation.
Dirk F van Helden1,2, Neil Spratt1,2,3, Peter J Dosen1
1School of Biomedical Sciences and Pharmacy, College of Health, Medicine and Wellbeing, University of Newcastle, Newcastle, New South Wales, Australia.
The Journal of Physiology
|June 9, 2026
Summary
Snake venom triggers inflammation, opening large pores that absorb toxins into the bloodstream. This inflammation-facilitated macromolecular absorption (IFMA) enhances venom spread, making snakebites dangerous and informing first aid.
Area of Science:
- Vascular biology
- Immunology
- Toxicology
Background:
- Snake envenomation causes inflammation via factors that increase vascular permeability.
- This inflammation opens large pores (IAPs) in microvasculature, facilitating plasma exudation.
Purpose of the Study:
- To investigate the role of IAPs in macromolecular absorption during snake envenomation.
- To determine the size of IAPs and their capacity for absorbing venom toxins.
Main Methods:
- Experimental measurement of IAP radius using dextran studies.
- Analysis of factors influencing macromolecular absorption, including concentration gradients and pressure.
Main Results:
- IAPs, with a measured radius of 21 nm, facilitate absorption of macromolecules, including snake venom toxins (1-6 nm radius).
- Inflammation-facilitated macromolecular absorption (IFMA) operates alongside lymphatic absorption for interstitial molecule clearance.
- Circulating venom induces further inflammation, enhancing toxin movement into tissues.
Conclusions:
- IFMA is a significant pathway for venom toxin absorption and dissemination.
- Understanding IFMA provides mechanistic insight into snakebite dangers and potential first aid improvements.
- IFMA may also play a role in clearing cellular breakdown products during wound healing.
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