Journal
INTERNATIONAL JOURNAL OF FOOD SCIENCES AND NUTRITION
Volume 67, Issue 8, Pages 995-1004Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/09637486.2016.1210574
Keywords
Meat proteins; oligopeptide transporter PEPT1; small intestine; intestinal villus
Categories
Funding
- NSFC (National Natural Science Foundation of China) [31530054, 31471600]
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The peptide transporter 1 (PEPT1) in the apical membrane of enterocytes is the central mechanism for regulating the absorption of di- and tripeptides. Dietary proteins may affect PEPT1 abundance and peptide absorption. The present study aimed to characterize changes in PEPT1 mRNA and PEPT1 protein levels in the duodenum and jejunum of young rats after 7-day diet intervention with casein (reference), soy, beef, pork, chicken and fish proteins and further evaluate the impact on the epithelial absorption capacity. RT-PCR and western blot analyses showed that: (1) PEPT1 protein level in duodenum was higher (p<0.05) for soy protein group than that for casein group. However, no difference was observed in jejunal PEPT1 protein level between any two diet groups (p>0.05). The soy protein group had lower crypt depth and higher V/C ratio in the jejunum (p<0.05). (2) PEPT1 mRNA levels were lower (p<0.05) in rat duodenum and jejunum in pork, chicken and fish protein groups, whose trend was contrary to the results of jejunual histological observation with lower crypt depth, greater villus height and higher V/C ratio. In conclusion, different meat proteins alter distinct PEPT1 expression level and absorption capacity as reflected by gut morphology in small intestine.
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