Abstract
Tetrodotoxin-resistant (TTX-R) sodium channels NaV1.8 and NaV1.9 in dorsal root ganglion (DRG) neurons play important roles in pathological pain. We recently reported that melittin, the major toxin of whole bee venom, induced action potential firings in DRG neurons even in the presence of a high concentration (500 nM) of TTX, indicating the contribution of TTX-R sodium channels. This hypothesis is fully investigated in the present study. After subcutaneous injection of melittin, NaV1.8 and NaV1.9 significantly upregulate mRNA and protein expressions, and related sodium currents also increase. Double immunohistochemical results show that NaV1.8-positive neurons are mainly medium- and small-sized, whereas NaV1.9-positive ones are only small-sized. Antisense oligodeoxynucleotides (AS ODNs) targeting NaV1.8 and NaV1.9 are used to evaluate functional significance of the increased expressions of TTX-R sodium channels. Behavioral tests demonstrate that AS ODN targeting NaV1.9, but not NaV1.8, reverses melittin-induced heat hypersensitivity. Neither NaV1.8 AS ODN nor NaV1.9 AS ODN affects melittin-induced mechanical hypersensitivity. These results provide previously unknown evidence that upregulation of NaV1.9, but not NaV1.8, in small-sized DRG neurons contributes to melittin-induced heat hypersensitivity. Furthermore, melittin-induced biological effect indicates a potential strategy to study properties of TTX-R sodium channels.
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This study was partially supported by the National Natural Science Foundation of China (81070899, 81171049 and 31100803) and 973 program (2011CB504100).
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Yao-Qing Yu and Zhen-Yu Zhao equally contributed to the work.
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12017_2012_8211_MOESM1_ESM.tif
Supplementary Figure 1 Action potential firings induced by melittin and electrical stimuli maintained in the presence of high concentration of TTX. (A) Application of melittin (1 μM, 50 s) to a DRG neuron produced slow membrane depolarization and tonic action potential firing lasting for about 500 s. Although administration of 500 nM TTX could suppress the response of action potentials, the tonic firings maintained in one DRG neuron. (B) Different current injections (intensity, 200, 400 and 500 pA; duration, 3 ms and 500 ms with a 200 ms interpulse at the holding potential) produced increased firings of action potential in one DRG neuron and the electrical-evoked responses remained in the presence of 500 nM TTX. Dotted line indicated the resting membrane potential of the DRG neuron (TIFF 1603 kb)
12017_2012_8211_MOESM2_ESM.tif
Supplementary Figure 2 Melittin treatment increased action potential firings and the inhibitory effects of specific antisense oligodeoxynucleotides (AS ODNs). (A) After melittin treatment, action potential firings induced by current injection (intensity, 500 pA; duration, 500 ms) were significantly increased (n=13-15). (B) Compared with MM ODN, the melittin-enhanced neuronal firings were inhibited by NaV1.8 or NaV1.9 AS ODN (n=7-9). AS, antisense. MM, mismatch. ODN, oligodeoxynucleotide. *p<0.05; **p<0.01 vs. control (TIFF 765 kb)
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Yu, YQ., Zhao, ZY., Chen, XF. et al. Activation of Tetrodotoxin-Resistant Sodium Channel NaV1.9 in Rat Primary Sensory Neurons Contributes to Melittin-Induced Pain Behavior. Neuromol Med 15, 209–217 (2013). https://doi.org/10.1007/s12017-012-8211-0
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DOI: https://doi.org/10.1007/s12017-012-8211-0