Abstract
Mental disorders are caused by chronic psychosocial stress, and can cause various symptoms related to the digestive system. We focused on the conjugation of intestinal absorptive and enzymatic mechanisms between chronic social defeat stress (CSDS) model rats and healthy controls to obtain general biochemical data about the intestine of the model in this study. The small intestine was divided into three regions: proximal (PI), middle (MI), and distal (DI); mRNA expression associated with a nutrient absorption, glucose absorption activity, and activities of the digestive enzymes such as maltase, sucrase and lactase was measured. Expression of both sodium-dependent glucose transporter 1 (Sglt1) and glucose transporter 2 gene tended to be higher in the stress group compared to the control group in PI. Glucose absorption was also higher in PI of the CSDS group. Sglt1 and peptide transporter 1 gene expressions in the CSDS group were significantly higher than those in the control group in DI. Furthermore, in PI, expression of the aquaporin 1 gene was significantly higher in the CSDS group compared to the control group. Thus, absorption of some nutrients might be higher in the small intestine of the CSDS rat.
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