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• W3152675979 abstract "Background and Purpose T-type voltage-gated calcium channels are an emerging therapeutic target for neurological disorders including epilepsy and pain. Inhibition of T-type channels reduces the excitability of peripheral nociceptive sensory neurons and reverses pain hypersensitivity in male rodent pain models. However, administration of peripherally restricted T-type antagonists failed to show efficacy in multiple clinical and preclinical pain trials, suggesting that inhibition of peripheral T-type channels alone may be insufficient for pain relief. Experimental Approach We utilized the selective and CNS-penetrant T-type channel antagonist, Z944, in electrophysiological, calcium imaging and behavioural paradigms to determine its effect on lamina I neuron excitability and inflammatory pain behaviours. Key Results Voltage-clamp recordings from lamina I spinal neurons of adult rats revealed that approximately 80% of neurons possess a low threshold T-type current, which was blocked by Z944. Due to this highly prevalent T-type current, Z944 potently blocked action-potential evoked somatic and dendritic calcium transients in lamina I neurons. Moreover, application of Z944 to spinal cord slices attenuated action potential firing rates in over half of laminae I/II neurons. Finally, we found that intraperitoneal injection of Z944 (1–10 mg·kg−1) dose-dependently reversed mechanical allodynia in the complete Freund's adjuvant model of persistent inflammatory pain, with a similar magnitude and time course of analgesic effects between male and female rats. Conclusion and Implications T-type calcium channels critically shape the excitability of lamina I pain processing neurons and inhibition of these channels by the clinical stage antagonist Z944 potently reverses pain hypersensitivity across sexes." @default.
• W3152675979 created "2021-04-26" @default.
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• W3152675979 date "2021-05-22" @default.
• W3152675979 modified "2023-10-17" @default.
• W3152675979 title "The T‐type calcium channel antagonist, Z944, reduces spinal excitability and pain hypersensitivity" @default.
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• W3152675979 doi "https://doi.org/10.1111/bph.15498" @default.
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