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Papers of the Week

Papers: 27 Jul 2019 - 2 Aug 2019

Animal Studies

2019 Dec




A potential role for T-type calcium channels in homocysteinemia-induced peripheral neuropathy.


Gaifullina AS, Lazniewska J, Gerasimova EV, Burkhanova GF, Rzhepetskyy Y, Tomin A, Rivas-Ramirez P, Huang J, Cmarko L, Zamponi GW, Sitdikova GF, Weiss N
Pain. 2019 Dec; 160(12):2798-2810.
PMID: 31365467.


Homocysteinemia is a metabolic condition characterized by abnormally high level of homocysteine in the blood and is considered to be a risk factor for peripheral neuropathy. However, the cellular mechanisms underlying toxic effects of homocysteine on the processing of peripheral nociception have not yet been investigated comprehensively. Here, using a rodent model of experimental homocysteinemia, we report the causal association between homocysteine and the development of mechanical allodynia. Homocysteinemia-induced mechanical allodynia was reversed upon pharmacological inhibition of T-type calcium channels. In addition, our in vitro studies indicate that homocysteine enhances recombinant T-type calcium currents by promoting the recycling of Cav3.2 channels back to the plasma membrane via a PKC-dependent signaling pathway that requires the direct phosphorylation of Cav3.2 at specific loci. Altogether, these results reveal an unrecognized signaling pathway that modulates the expression of T-type calcium channels, and may potentially contribute to the development of peripheral neuropathy associated with homocysteinemia.