AAS ›› 2014, Vol. 45 ›› Issue (4): 540-544.doi: 10.3969/j.issn.0529-1356.2014.04.018

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Spatio-temporal expression of P2X3 receptor in rats with diabetic mechanical allodynia

CUI Yuan-yuan 1,2 WU Huang-hui3 WANG Lan2 SHI Juan1 LI Yun-qing 1*   

  1. 1. Department of Anatomy, Histology and Embryology, K.K. Leung Brain Research Centre, Fourth Military Medical University, Xi’an 710032, China;2. Department of Histology and Embryology, Xi’an Medical University, Xi’an 710021, China; 3. Department of Anesthesiology, Fuzhou General Hospital of Nanjing Military Command, Fuzhou 350025, China
  • Received:2014-02-10 Revised:2014-03-25 Online:2014-08-06 Published:2014-08-06
  • Contact: LI Yun-qing E-mail:deptanat@fmmu.edu.cn

Abstract:

Objectiv To investigate the spatio-temporal expression of P2X3 receptor (P2X3R) in rats with diabetic mechanical allodynia (DMA).Methods DMA model in rats was induced by intraperitoneal injection of streptozocin (STZ). The von Frey filaments were applied to identify the changes of the paw withdrawal threshold (PWT) in DMA rats. Immunofluorescence was employed to detect the spatiotemporal expression of P2X3R in the spinal dorsal horn (SDH), dorsal root ganglion (DRG) and hind paw skin on different time points after intraperitoneal injection of STZ, respectively. The protein expression of P2X3R in SDH and DRG was further semi-quantitatively analyzed by Western blotting. Results Compared with control group, intraperitoneal injection STZ induced significant mechanical allodynia indicated by the reduced PWT from 7 days, and which reached the peak on 14d and maintained to 28days (P<0.05). The expression of P2X3R in DRG neurons was significantly increased on 14 days and 21 days (P<0.05), while that in SDH and skin was markedly increased on 21 days and 28 days, compared with control group (P<0.05). Conclusion With the progress of DMA, the expression of P2X3R was significantly increased in the SDH, DRG and skin, which was almost parallel with the mechanical allodynia, but the changes in SDH and skin were 1 week later than that in DRG. These results suggest that P2X3R may play a key role in the maintenance of the DMA.

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