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자료유형
학술저널
저자정보
저널정보
대한재활의학회 Annals of Rehabilitation Medicine Annals of Rehabilitation Medicine 제35권 제5호
발행연도
2011.1
수록면
589 - 598 (10page)

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Objective To investigate changes in (1) the colonic response to acetylcholine (Ach), (2) the muscarinic (M)receptors in the colon, and (3) the levels of colonic contraction-related proteins after a spinal cord injury (SCI). Method We divided 16 Sprague-Dawley rats into 2 groups: the control group and the SCI group. A spinal cord transection was performed surgically at the T10 vertebral level. After 1 week, the entire colon was divided into 2segments, the proximal and distal colon. Each segment was mounted in a longitudinal or circular muscle direction in a 10-ml organ bath. We determined the intergroup differences as percentage changes in contractility after Ach treatment alone, Ach treatment with M2 receptor antagonist (AQ-RA741) pretreatment, and Ach treatment with M3 receptor antagonist (4-DAMP) pretreatment. Western blot analyses were performed to determine the expression level of RhoA, and heat shock protein 27 (HSP27). Results Compared to the control rats, the SCI rats showed an increased response to Ach along both the directions in the proximal colon (p<0.05). Compared to the control group, in the SCI group, the Ach response was signifi cantly diff erent in the proximal segment under AQ-RA741 pretreatment (p<0.05) and in the distal segment under 4-DAMP pretreatment (p<0.05). Findings of the western blot analyses showed a signifi cant decrease in the level of protein gene product 9.5 in the proximal and distal colon and a signifi cant increase in the level of RhoA and HSP27 in the proximal colon of the SCI rats. Conclusion Our results suggest that changes in colonic contractility after SCI are partly attributable to changes in the M receptor subtypes.

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