Painful nerve injury increases plasma membrane Ca2+-ATPase activity in axotomized sensory neurons

Molecular Pain

Quinn H Hogan²  Qingbo Tang¹  Madhavi Latha Yadav Bangaru¹  Hsiang-En Wu¹  Bin Pan¹  Katherine D Oyster¹  Geza Gemes³ 

[1] Medical College of Wisconsin, Department of Anesthesiology, 8701 Watertown Plank Road, Milwaukee, WI 53226, USA;Zablocki VA Medical Center, 5000 W. National Avenue, Milwaukee, WI 53295, USA;Department of Anesthesiology and Intensive Care Medicine, Medical University of Graz, Auenbruggerplatz 29, 8036 Graz, Austria

关键词: Nerve injury;    Calcium;    Neuron;    Dorsal root ganglion;    PMCA;   

Others  :  863826
DOI  :  10.1186/1744-8069-8-46

 received in 2012-04-05, accepted in 2012-06-13,  发布年份 2012

【 摘 要 】

Background

The plasma membrane Ca²⁺-ATPase (PMCA) is the principal means by which sensory neurons expel Ca²⁺ and thereby regulate the concentration of cytoplasmic Ca²⁺ and the processes controlled by this critical second messenger. We have previously found that painful nerve injury decreases resting cytoplasmic Ca²⁺ levels and activity-induced cytoplasmic Ca²⁺ accumulation in axotomized sensory neurons. Here we examine the contribution of PMCA after nerve injury in a rat model of neuropathic pain.

Results

PMCA function was isolated in dissociated sensory neurons by blocking intracellular Ca²⁺ sequestration with thapsigargin, and cytoplasmic Ca²⁺ concentration was recorded with Fura-2 fluorometry. Compared to control neurons, the rate at which depolarization-induced Ca²⁺ transients resolved was increased in axotomized neurons after spinal nerve ligation, indicating accelerated PMCA function. Electrophysiological recordings showed that blockade of PMCA by vanadate prolonged the action potential afterhyperpolarization, and also decreased the rate at which neurons could fire repetitively.

Conclusion

We found that PMCA function is elevated in axotomized sensory neurons, which contributes to neuronal hyperexcitability. Accelerated PMCA function in the primary sensory neuron may contribute to the generation of neuropathic pain, and thus its modulation could provide a new pathway for peripheral treatment of post-traumatic neuropathic pain.

【 授权许可】

   
2012 Gemes et al.; licensee BioMed Central Ltd.

【 图 表 】

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