《Chinese Journal of Rehabilitation Theory and Practice》 ›› 2020, Vol. 26 ›› Issue (2): 181-188.doi: 10.3969/j.issn.1006-9771.2020.02.008

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Aquaporin Over-expression for Constipation in Rats with Spinal Cord Injury

XU Pei-pei1,2,3,4,YANG Ming-liang1,2,3,4(),LIU Chang-bin5,LI Ya-jing1,2,3,4,LIU Zi-tong1,2,3,4,LI Jian-jun1,2,3,4   

  1. 1. Capital Medical University School of Rehabilitation Medicine, Beijing, 100068, China
    2. Department of Spinal and Neural Function Reconstruction, Beijing Bo'ai Hospital, China Rehabilitation Research Center, Beijing 100068, China
    3. Center of Neural Injury and Repair, Beijing Institute for Brain Disorders, Beijing, 100068, China
    4. Beijing Key Laboratory of Neural Injury and Rehabilitation, Beijing, 100068, China
    5. Department of Rehabilitation Medicine, Beijing Tiantan Hospital, Capital Medical University, Beijing 100070, China
  • Received:2019-12-02 Revised:2020-01-03 Published:2020-02-25 Online:2020-03-19
  • Contact: YANG Ming-liang E-mail:chinayml3@163.com
  • Supported by:
    Beijing Municipal Natural Science Foundation(7192238);China Rehabilitation Research Center Basic Scientific Research Foundation(2018ZX-9)

Abstract:

Objective To investigate the relation between aquaporins (AQPs) and fecal water content in rats with spinal cord injury.Methods A total of 48 female Sprague-Dawley rats were divided into control group (n= 24) and spinal cord injury group (SCI group, n = 24). SCI group underwent transection at T8, while the control group was only subjected to laminectomy. Posterior limb function was assessed by Basso-Beattie-Bresnahan (BBB) score before modeling and on the 1st, 3rd, 7th, 14th and 28th day after SCI. Fecal water content was measured before modeling and on the 3rd, 14th and 28th day after SCI. Colon specimens were collected to detect the expression of AQP1, AQP3 and AQP4 by immunohistochemistry on the 3rd, 14th and 28th day after SCI.Results The BBB score was significantly lower in SCI group than in the control group (t > 69.230, P< 0.001) after SCI, as well as the fecal water content (t > 5.814, P< 0.001). The expression of AQP1, AQP3, and AQP4 in the colon was higher in SCI group than in the control group (|t|> 5.165,P < 0.01) on the 3rd, 14th, and 28th day after SCI. The expression of AQPs negatively correlated with fecal water content ( r = -0791~-0.730, P< 0.001).Conclusion The expression of AQPs in the colon of rats after SCI was up-regulated, which was correlated with excessive water absorption after SCI.

Key words: spinal cord injury, bowel dysfunction, aquaporin, constipation, colon, fecal water content, rats

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