Toll-like receptor 4 – Filamin A complex (TLR4-FLNA complex)

The Toll-like receptor 4 – Filamin A (TLR4-FLNA) complex is a signaling assembly where the cytoskeletal protein Filamin A scaffolds the TLR4 receptor, facilitating its activation and downstream pro-inflammatory signaling (Wang et al., 2008, PLoS ONE). This complex is particularly relevant in the central nervous system, where its activation in glial cells contributes to neuroinflammation, neuropathic pain, and the development of opioid tolerance and hyperalgesia (Burns & Wang, 2017, Neurotherapeutics). Drugs like naloxone and naltrexone, including their non-opioid isomers like (+)-naloxone, have been shown to bind to Filamin A with high affinity, disrupting the TLR4-FLNA interaction (Wang et al., 2008, PLoS ONE). By preventing this association, these agents inhibit the TLR4-mediated release of inflammatory cytokines without interfering with classical opioid receptor signaling (Skolnick, 2018, Trends in Pharmacological Sciences). This makes the TLR4-FLNA complex a significant target for improving the therapeutic index of opioid analgesics and treating chronic pain conditions.

Other names

TLR4-Filamin A complexFilamin A-TLR4 complexFLNA-TLR4 complexToll-like receptor 4 – FLNA-mediated complex

Small molecule ligands bind to the Filamin A component of the complex to disrupt its physical interaction with Toll-like receptor 4, thereby inhibiting the recruitment of adapter proteins and preventing downstream pro-inflammatory cytokine production.