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Trigeminal neuropathic pain is alleviated by inhibition of Ca(v)3.3 T-type calcium channels in mice

Publication at First Faculty of Medicine |
2021

Abstract

In this brief report, we demonstrate that the Ca(v)3.3 T-type voltage-gated calcium channel subtype is involved in our FRICT-ION model of chronic trigeminal neuropathic pain. We first showed that the Cacna1i gene encoding Ca(v)3.3 is significantly upregulated in whole trigeminal ganglia of FRICT-ION mice compared to controls at week 10 post-injury.

We confirmed protein upregulation of Ca(v)3.3 compared to controls using Western blot analysis of whole trigeminal ganglia tissues. Finally, we demonstrated that intraperitoneal injection of a selective TAT-based Ca(v)3.3 blocking peptide in FRICT-ION mice significantly reduces Ca(v)3.3 protein expression at the peak anti-allodynic effect (4 hrs post-injection) of the attenuated neuropathic pain behavior.

We also suggest that blockade of Ca(v)3.3 may be more effective in attenuating trigeminal neuropathic pain in female than male FRICT-ION mice. Therefore, blocking or attenuating Ca(v)3.3 function may be an effective strategy for the treatment of trigeminal neuropathic pain.