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Sichuan pickles (Paocai) are a traditional Chinese fermented vegetable food that is rich in beneficial microorganisms. In this study, the inhibition of constipation by Lactobacillus plantarum CQPC02 (LP-CQPC02) isolated from Sichuan Paocai was studied by establishing a constipation model of mice using activated carbon. The constipation inhibition effect of LP-CQPC02 was determined by observing the defecation of mice, rate of active carbon propulsion, pathological section observation, serum index, and small intestinal mRNA expression. The results showed that LP-CQPC02 inhibited the decrease in body weight caused by constipation in mice. At the same time, LP-CQPC02 also increased the propulsion rate of activated carbon in the small intestine and shortened the time of discharge for the first black stool. LP-CQPC02 increased gastrin (Gas), motilin (MTL), endothelin (ET), and acetylcholinesterase (AChE) in constipated mice, and it also decreased the level of somatostatin (SS). qPCR results showed that LP-CQPC02 upregulated the expression of c-Kit, stem cell factor (SCF), and glial cell-derived neurotrophic factor (GDNF) and downregulated the expression of transient receptor potential cation channel subfamily V member 1 (TRPV1) and inducible nitric oxide synthase (iNOS) in mice with constipation, and a stronger effect was observed with a high concentration of LP-CQPC02. The experimental results showed that LP-CQPC02 has a stronger constipation inhibitory effect than the commonly used commercial Lactobacillus delbrueckii subsp. bulgaricus (LB), and the inhibitory effect of LP-CQPC02 on constipation increases with increasing concentration of LP-CQPC02. Therefore, LP-CQPC02 is a high-quality microbial resource with a good constipation inhibition effect and probiotic potential.

Inhibitory Effect of Lactobacillus plantarum CQPC02 Isolated from Chinese Sichuan Pickles (Paocai) on Constipation in Mice