Prospect of using ethnobotanicals to manage snakebites in a cost-effective manner: validating Senegalia mellifera extract's inhibitory potential on Naja nigricincta nigricincta (zebra cobra) venom

Abstract

Background: Despite Naja nigricincta nigricincta being responsible for most snake envenomation in remote Namibian regions, an effective intervention against its venom remains undiscovered. This study aimed to scientifically validate Namibian folklore claims about Senegalia mellifera extract's efficacy against snake envenomation.

Methods: In vitro assays were conducted to assess the inhibitory potential of S. mellifera stem bark extract on snake venom phospholipase A2 (svPLA2) activity from N. n. nigricincta venom. Gas chromatography-mass spectrometry (GC-MS) and molecular docking predicted phytochemicals responsible for inhibitory effects on venom proteins.

Results: The svPLA2 activity assay demonstrated significant inhibitory potential of the extract, reducing enzyme activity from 100% to as low as 66.99%. GC-MS analysis indicated an abundant presence of terpenes having antisnake venom activity. Molecular docking identified phytochemicals of S. mellifera capable of neutralizing prevalent cobra toxins, that is, stigmasterol acetate, beta-Sitosterol acetate, vitamin E, kaur-15-ene, squalene and 4,6-Cholestadien-3beta-ol.

Conclusions: This plant extract cannot be considered as a discrete treatment against venom. It may serve as a transient remedy to impede the toxic effects or supplement the action of antivenoms. Future research should be aimed at finding other plants with greater antivenom potential to increase the prospect of using ethnobotanicals to manage snakebites in a cost-effective manner.

Keywords: Senegalia mellifera; antivenoms; molecular docking; phytochemical; snakebites; zebra snake.