AI Article Synopsis
- The study focuses on the gene expression patterns of Peptide YY (PYY) and proglucagon, which are important for energy balance, in specific regions of the gut in response to nutrients.
- Gene expression was analyzed in rats using various methods, including a diet high in fermentation-resistant starch and incubation with butyrate.
- Results indicate that certain parts of the gut can detect nutrients like butyrate, leading to increased levels of PYY and proglucagon, particularly in the cecum and colon of rats on the resistant starch diet.
Article Abstract
Objective: Peptide YY (PYY) and glucagon-like peptide-1 are important in the control of energy homeostasis and are both secreted from the gut in response to ingested nutrients. However, more studies are needed on nutrient regulation of their gene expression patterns in specific areas of the gut. This study detailed PYY and proglucagon (the gene that encodes glucagon-like peptide-1) gene expression patterns and regulation in the gut. We further examined the regulation of PYY and proglucagon mRNA by a diet containing fermentation-resistant starch (in vivo) and butyrate (in vitro).
Research Methods And Procedures: Quantitative real time reverse transcriptase-polymerase chain reaction was used to measure PYY and proglucagon gene expression in epithelial cells collected from the duodenum, jejunum, cecum, and colon in normal Sprague-Dawley rats and in rats fed a resistant starch diet for 4 weeks. The same measurements were also performed in primary epithelial cells collected from the cecum and colon of normal rats after the cells were incubated with butyrate for 3 hours.
Results: The gene expression patterns for PYY and proglucagon are similar to their peptide distribution patterns in the gut. Also, PYY and proglucagon mRNA expression were up-regulated in the cecum and colon in resistant-starch-fed rats. Butyrate increased PYY and proglucagon gene expression in a dose-dependent manner in vitro.
Discussion: Our data provide evidence that the distal part of the gut has the ability to sense nutrients such as butyrate, resulting in the up-regulation of PYY and proglucagon gene expression.
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| http://dx.doi.org/10.1038/oby.2006.77 | DOI Listing |
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