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TWIK-Related Spinal Cord K⁺ Channel Expression Is Increased in the Spinal Dorsal Horn after Spinal Nerve Ligation.

Hwang HY, Zhang E, Park S, Chung W, Lee S, Kim DW, Ko Y, Lee W - Yonsei Med. J. (2015)

Bottom Line: The SNL group showed significantly higher expression of TRESK in the ipsilateral dorsal horn under pain, but low expression in L5 DRG.Double immunofluorescence staining revealed that immunoreactivity of TRESK was mostly restricted in neuronal cells, and that synapse markers GAD67 and VGlut2 appeared to be associated with TRESK expression.We were unable to find a significant association between TRESK and calcineurin by double immunofluorescence.

View Article: PubMed Central - PubMed

Affiliation: Department of Anesthesia and Pain Medicine, Chungnam National University Medical School, Daejeon, Korea.

ABSTRACT

Purpose: The TWIK-related spinal cord K⁺ channel (TRESK) has recently been discovered and plays an important role in nociceptor excitability in the pain pathway. Because there have been no reports on the TRESK expression or its function in the dorsal horn of the spinal cord in neuropathic pain, we analyzed TRESK expression in the spinal dorsal horn in a spinal nerve ligation (SNL) model.

Materials and methods: We established a SNL mouse model by using the L5-6 spinal nerves ligation. We used real-time polymerase chain reaction and immunohistochemistry to investigate TRESK expression in the dorsal horn and L5 dorsal rot ganglion (DRG).

Results: The SNL group showed significantly higher expression of TRESK in the ipsilateral dorsal horn under pain, but low expression in L5 DRG. Double immunofluorescence staining revealed that immunoreactivity of TRESK was mostly restricted in neuronal cells, and that synapse markers GAD67 and VGlut2 appeared to be associated with TRESK expression. We were unable to find a significant association between TRESK and calcineurin by double immunofluorescence.

Conclusion: TRESK in spinal cord neurons may contribute to the development of neuropathic pain following injury.

No MeSH data available.


Related in: MedlinePlus

Mechanical allodynia after spinal nerve ligation (SNL). Paw withdrawal threshold in response to von Frey filament stimulation decreased from 6.67±0.94 g before surgery to 0.57±0.07 g 10 days after surgery. This mechanical allodynia persisted at least for 14 days (0.65±0.13 g). Sham-operated rats showed no signs of hypersensitivity. *p<0.001 vs. the corresponding contralateral side. co, contralateral to the injured hind paw; ips, ipsilateral to the injured hind paw.
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Figure 1: Mechanical allodynia after spinal nerve ligation (SNL). Paw withdrawal threshold in response to von Frey filament stimulation decreased from 6.67±0.94 g before surgery to 0.57±0.07 g 10 days after surgery. This mechanical allodynia persisted at least for 14 days (0.65±0.13 g). Sham-operated rats showed no signs of hypersensitivity. *p<0.001 vs. the corresponding contralateral side. co, contralateral to the injured hind paw; ips, ipsilateral to the injured hind paw.

Mentions: Neuropathic pain in the form of allodynia developed in the SNL group, while there was no such pain in the sham group (Fig. 1). Mechanical allodynia occurred after SNL. PWTs in response to von Frey filament stimulation decreased from 6.67±0.94 g before surgery to 0.57±0.07 g 10 days after surgery. This mechanical allodynia persisted for at least 14 days (0.65±0.13 g). Sham-operated rats showed no signs of hypersensitivity.


TWIK-Related Spinal Cord K⁺ Channel Expression Is Increased in the Spinal Dorsal Horn after Spinal Nerve Ligation.

Hwang HY, Zhang E, Park S, Chung W, Lee S, Kim DW, Ko Y, Lee W - Yonsei Med. J. (2015)

Mechanical allodynia after spinal nerve ligation (SNL). Paw withdrawal threshold in response to von Frey filament stimulation decreased from 6.67±0.94 g before surgery to 0.57±0.07 g 10 days after surgery. This mechanical allodynia persisted at least for 14 days (0.65±0.13 g). Sham-operated rats showed no signs of hypersensitivity. *p<0.001 vs. the corresponding contralateral side. co, contralateral to the injured hind paw; ips, ipsilateral to the injured hind paw.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4541660&req=5

Figure 1: Mechanical allodynia after spinal nerve ligation (SNL). Paw withdrawal threshold in response to von Frey filament stimulation decreased from 6.67±0.94 g before surgery to 0.57±0.07 g 10 days after surgery. This mechanical allodynia persisted at least for 14 days (0.65±0.13 g). Sham-operated rats showed no signs of hypersensitivity. *p<0.001 vs. the corresponding contralateral side. co, contralateral to the injured hind paw; ips, ipsilateral to the injured hind paw.
Mentions: Neuropathic pain in the form of allodynia developed in the SNL group, while there was no such pain in the sham group (Fig. 1). Mechanical allodynia occurred after SNL. PWTs in response to von Frey filament stimulation decreased from 6.67±0.94 g before surgery to 0.57±0.07 g 10 days after surgery. This mechanical allodynia persisted for at least 14 days (0.65±0.13 g). Sham-operated rats showed no signs of hypersensitivity.

Bottom Line: The SNL group showed significantly higher expression of TRESK in the ipsilateral dorsal horn under pain, but low expression in L5 DRG.Double immunofluorescence staining revealed that immunoreactivity of TRESK was mostly restricted in neuronal cells, and that synapse markers GAD67 and VGlut2 appeared to be associated with TRESK expression.We were unable to find a significant association between TRESK and calcineurin by double immunofluorescence.

View Article: PubMed Central - PubMed

Affiliation: Department of Anesthesia and Pain Medicine, Chungnam National University Medical School, Daejeon, Korea.

ABSTRACT

Purpose: The TWIK-related spinal cord K⁺ channel (TRESK) has recently been discovered and plays an important role in nociceptor excitability in the pain pathway. Because there have been no reports on the TRESK expression or its function in the dorsal horn of the spinal cord in neuropathic pain, we analyzed TRESK expression in the spinal dorsal horn in a spinal nerve ligation (SNL) model.

Materials and methods: We established a SNL mouse model by using the L5-6 spinal nerves ligation. We used real-time polymerase chain reaction and immunohistochemistry to investigate TRESK expression in the dorsal horn and L5 dorsal rot ganglion (DRG).

Results: The SNL group showed significantly higher expression of TRESK in the ipsilateral dorsal horn under pain, but low expression in L5 DRG. Double immunofluorescence staining revealed that immunoreactivity of TRESK was mostly restricted in neuronal cells, and that synapse markers GAD67 and VGlut2 appeared to be associated with TRESK expression. We were unable to find a significant association between TRESK and calcineurin by double immunofluorescence.

Conclusion: TRESK in spinal cord neurons may contribute to the development of neuropathic pain following injury.

No MeSH data available.


Related in: MedlinePlus