Objective: To study the expression of Akt and MAPK in the stomach and colon of slow transit constipation (STC) in rats, as well as the effect of exogenous glial cell line-derived neurotrophic factor (GDNF) on it.
Methods: Forty-four SD rats were divided into control group and model group randomly. The STC model group was established by gastric irrigation of rhubarb for 3.5 months. The control group was received normal saline. After model building, each group was equally divided into 2 subgroup randomly, administrated with exogenous GDNF and normal saline by vein injection for one week respectively. The expression of Akt and MAPK in stomach and colon was detected by immunohistochemistry.
Results: (1) The expression of Akt in the stomach tended to weaker in STC rats comparing with the normal rats (P > 0.05), but it was stronger in STC plus GDNF group than in STC group (P < 0.05). (2) The expression of Akt and MAPK in the colon was weaker in STC group than in the normal group (all P < 0.05), and was stronger in STC plus GDNF group than in STC group (all P < 0.05). (3) The expression of MAPK in the stomach in STC group was weaker than in normal group (P < 0.05), and was stronger in STC plus GDNF group than in STC group (P < 0.01). There was no significant difference among STC plus GDNF group, normal group and GDNF group (P > 0.05).
Conclusions: Long term consumption of rhubarb could induce STC by down-regulating the expression of Akt and MAPK in digestive tract. Exogenous GDNF may have a potential role on the etiology of STC.
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