Acute Toxicity of the Recombinant and Native Phα1β Toxin: New Analgesic from Spider Venom.

Phα1β, a purified peptide from the venom of the spider , and its recombinant form CTK 01512-2 are voltage-dependent calcium channel (Ca) blockers of types N, R, /Q, and L with a preference for type N. These peptides show analgesic action in different pain models in rats. The aim of this study was to evaluate the acute intrathecal toxicity of the native and recombinant Phα1β toxin in Wistar rats.