Biological properties of Trimeresurus mucrosquamatus venom and its fractions

Area of Science:

• * Biochemistry and Toxicology
• * Snakebite Research
• * Venom Component Analysis

Background:

• * Understanding snake venom composition is crucial for developing effective antivenoms and treatments.
• * Trimeresurus mucrosquamatus (brown-speckled pit viper) venom contains complex protein mixtures with diverse biological activities.

Purpose of the Study:

• * To characterize the toxicological properties of Trimeresurus mucrosquamatus venom fractions.
• * To investigate the influence of administration route on venom lethality.
• * To determine the stability of venom components under various conditions.

Main Methods:

• * Sephadex G-100 gel filtration was employed to separate Trimeresurus mucrosquamatus venom into distinct fractions.
• * Lethal dose (LD50) was determined via intravenous (i.v.) and intraperitoneal (i.p.) injections.
• * Hemorrhagic and proteolytic activities were assessed, alongside venom susceptibility to heat, pH, and chemical agents.

Main Results:

• * Fraction I (FI) exhibited the primary lethal and hemorrhagic activities, with a lower LD50 via i.v. injection.
• * Fraction II (FII) showed reversed lethality patterns compared to FI, with lower toxicity via i.p. injection.
• * The venom demonstrated susceptibility to heat, pH variations, and cysteine-HCl, but not to albumin, sodium glutamate, sorbitol, or glycine.

Conclusions:

• * Trimeresurus mucrosquamatus venom fractionation yields components with differential toxicity and activity profiles.
• * The route of administration significantly impacts the lethal effects of venom fractions.
• * Venom stability is influenced by environmental factors, suggesting potential targets for neutralization strategies.