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Differential proteome analysis along jejunal crypt-villus axis in piglets
Xia Xiong, Huansheng Yang, Xihai Hu1
1Chinese Academy of Science, Institute of Subtropical Agriculture, Research Center of Healthy Breeding Livestock and Poultry, Human Engineering and Research Center of Animal and Poultry Science, Key Lab Agroecology Processing Subtropical Region, Scientific.
Researchers identified brush-border membrane (BBM) proteins in piglet jejunum, revealing changes during enterocyte maturation. Nutrient digestion proteins decreased, while structural proteins increased along the crypt-villus axis.
Area of Science:
- Gastroenterology
- Proteomics
- Cell Biology
Background:
- The brush-border membrane (BBM) of enterocytes is crucial for nutrient and ion digestion and absorption in the small intestine.
- Understanding protein dynamics during enterocyte maturation is key to comprehending intestinal function.
Purpose of the Study:
- To identify brush-border membrane (BBM) proteins associated with enterocyte maturation along the crypt-villus axis in piglets.
- To investigate differential protein expression during epithelial cell differentiation.
Main Methods:
- Enterocytes were isolated sequentially from the jejunal villus tip to crypt in 21-day-old suckling piglets.
- Brush-border membrane (BBM) vesicles were prepared and analyzed using isobaric tags for relative and absolute quantification (iTRAQ) proteomics.
- Differential protein expression was verified using Western blot and immunochemical analysis.
Main Results:
- A total of 194 BBM proteins were identified, with 56 showing differential expression along the crypt-villus axis.
- Proteins involved in nutrient digestion and absorption were predominantly downregulated in the upper villus, middle villus, and crypt regions compared to the villus tip.
- Proteins related to structural functions and enzyme regulation were largely upregulated during differentiation.
Conclusions:
- The study identified key BBM proteins that change during enterocyte differentiation in the piglet jejunum.
- These findings enhance the understanding of nutrient digestion and absorption processes in piglets and other mammals, including humans.
- Differential expression patterns highlight the specialized roles of enterocytes along the crypt-villus axis.
