Insect voltage-gated sodium channel (Nav) (Nav)

The insect voltage-gated sodium channel (VGSC) is a fundamental transmembrane protein essential for the generation and propagation of electrical signals in the nervous system of insects and other arthropods (Zlotkin, 1999). While mammals possess nine distinct sodium channel isoforms, most insects rely on a single gene, often termed "para," which achieves functional diversity through complex alternative splicing and RNA editing (Dong et al., 2014). The channel consists of a large alpha subunit with four homologous domains that form a central pore selective for sodium ions, opening in response to membrane depolarization (Silver et al., 2014). This channel is the primary molecular target for several of the most widely used insecticide classes, including pyrethroids and DDT, which stabilize the open state of the channel, leading to hyperexcitability and paralysis (Davies et al., 2007). Other agents, such as indoxacarb and metaflumizone, act as voltage-dependent blockers that inhibit sodium flow, resulting in flaccid paralysis and death (Silver et al., 2014). Understanding the structural differences between insect and mammalian sodium channels is crucial for developing selective pesticides that minimize risks to human health and the environment.

Other names

Para sodium channelArthropod voltage-gated sodium channelNav1 channelSodium channel protein para

Modulation of channel gating to delay inactivation or voltage-dependent blockade of the channel pore.