JOURNAL ARTICLE

The pattern of expression of the voltage-gated sodium channels Na(v)1.8 and Na(v)1.9 does not change in uninjured primary sensory neurons in experimental neuropathic pain models

Isabelle Decosterd, Ru-Rong Ji, Salahadin Abdi, Simon Tate, Clifford J Woolf
Pain 2002, 96 (3): 269-77
11972999
A spared nerve injury of the sciatic nerve (SNI) or a segmental lesion of the L5 and L6 spinal nerves (SNL) lead to behavioral signs of neuropathic pain in the territory innervated by adjacent uninjured nerve fibers, while a chronic constriction injury (CCI) results in pain sensitivity in the affected area. While alterations in voltage-gated sodium channels (VGSCs) have been shown to contribute to the generation of ectopic activity in the injured neurons, little is known about changes in VGSCs in the neighboring intact dorsal root ganglion (DRG) neurons, even though these cells begin to fire spontaneously. We have now investigated changes in the expression of the TTX-resistant VGSCs, Nav1.8 (SNS/PN3) and Nav1.9 (SNS2/NaN) by immunohistochemistry in rat models of neuropathic pain both with an intermingling of intact and degenerated axons in the nerve stump (SNL and CCI) and with a co-mingling in the same DRG of neurons with injured and uninjured axons (sciatic axotomy and SNI). The expression of Nav1.8 and Nav1.9 protein was abolished in all injured DRG neurons, in all models. In intact DRGs and in neighboring non-injured neurons, the expression and the distribution among the A- and C-fiber neuronal populations of Nav1.8 and Nav1.9 was, however, unchanged. While it is unlikely, therefore, that a change in the expression of TTX-resistant VGSCs in non-injured neurons contributes to neuropathic pain, it is essential that molecular alterations in both injured and non-injured neurons in neuropathic pain models are investigated.

Full Text Links

Find Full Text Links for this Article

Discussion

You are not logged in. Sign Up or Log In to join the discussion.

Trending Papers

Remove bar
Read by QxMD icon Read
11972999
×

Save your favorite articles in one place with a free QxMD account.

×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"