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Physiological and Biochemical Analysis to Reveal the Molecular Basis for Black Widow Spiderling Toxicity.

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Physiological and Biochemical Analysis to Reveal the Molecular Basis for Black Widow Spiderling Toxicity.

J Biochem Mol Toxicol. 2014 Mar 10;

Authors: Peng X, Zhang Y, Liu J, Yu H, Chen J, Lei Q, Wang X, Liang S

The early research found that the spiderlings of black widow spider (Latrodectus tredecimguttatus) exhibited obvious toxicity to animals. The present work performed a systematical analysis of the aqueous extract of newborn black widow spiderlings. The extract was shown to contain 69.42% of proteins varying in molecular weights and isoelectric points. Abdominal injection of the extract into mice and cockroaches caused obvious poisoning symptoms as well as death, with LD50 being 5.30 mg/kg in mice and 16.74 µg/g in Periplaneta americana. Electrophysiological experiments indicated that the extract at a concentration of 10 µg/mL could completely block the neuromuscular transmission in isolated mouse nerve-hemidiaphragm preparations within 21 ± 1.5 min, and 100 µg/mL extract could inhibit a certain percentage of voltage-activated Na(+) , K(+) , and Ca(2+) channel currents in rat dorsal root ganglion neurons. These results demonstrate that the spiderlings are rich in neurotoxic components, which play important roles in the spiderling toxicity.

PMID: 24616210 [PubMed – as supplied by publisher]

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