Abstract | BACKGROUND: RESULTS: Diabetes was induced by an intraperitoneal injection of streptozotocin (STZ). We showed that mechanical allodynia was induced two weeks after a STZ injection and lasted for at least another seven weeks. The mechanical allodynia was significantly attenuated by peripheral administration of the P2X receptor antagonists, PPADS or TNP-ATP. DiI was subcutaneously injected into the rat hindpaw to label hindpaw-innervated dorsal root ganglion (DRG) neurons. ATP activated fast-inactivating P2X3 receptor-mediated currents in the labeled DRG neurons were studied. ATP responses in STZ-treated rats were ~2-fold larger than those in control rats. Furthermore, the expression of P2X3 receptor proteins in the plasma membrane of L4-6 DRGs of STZ rats was significantly enhanced while the total expression of P2X3 receptors remained unaltered. CONCLUSIONS: These results indicate that a large enhancement of P2X3 receptor activity and an increase in the membrane expression of P2X3 receptors contribute to the development of chronic pain in STZ-induced diabetic rats and suggest a possible target for the treatment of diabetic neuropathic pain.
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Authors | Guang-Yin Xu, Guangwen Li, Ningang Liu, Li-Yen Mae Huang |
Journal | Molecular pain
(Mol Pain)
Vol. 7
Pg. 60
(Aug 18 2011)
ISSN: 1744-8069 [Electronic] United States |
PMID | 21851615
(Publication Type: Journal Article, Research Support, N.I.H., Extramural, Research Support, Non-U.S. Gov't)
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Chemical References |
- Purinergic P2X Receptor Antagonists
- Receptors, Purinergic P2X3
- Streptozocin
- Adenosine Triphosphate
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Topics |
- Adenosine Triphosphate
(metabolism)
- Animals
- Cell Membrane
(drug effects, metabolism)
- Diabetes Mellitus, Experimental
(complications, metabolism, pathology)
- Extremities
(innervation, pathology)
- Ganglia, Spinal
(drug effects, pathology, physiopathology)
- Hyperalgesia
(complications, metabolism, pathology)
- Hyperglycemia
(complications, metabolism, pathology)
- Ion Channel Gating
(drug effects)
- Male
- Purinergic P2X Receptor Antagonists
(pharmacology)
- Rats
- Rats, Sprague-Dawley
- Receptors, Purinergic P2X3
(metabolism)
- Streptozocin
- Time Factors
- Up-Regulation
(drug effects)
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