Colon ASBT mRNA and protein in CIE vs controls?

• A. Higher
• B. Lower
• C. Not different
• D. Not different across groups (Correct)

Answer: (D)

The key idea here is that colonic ASBT expression does not change with chronic inflammatory enteropathy. The finding that both mRNA and protein levels of ASBT in the colon are not different from controls means there’s no transcriptional or translational upregulation or downregulation in this tissue due to CIE. In other words, bile acid reabsorption via the colonic ASBT transporter remains similar between diseased and healthy dogs, so alterations in colonic bile acid handling are unlikely to be driven by changes in ASBT. This supports the interpretation that, if bile acid homeostasis is affected in CIE, the mechanism is not due to colonic ASBT expression but may involve other sites or processes (such as ileal transport or microbial metabolism). Therefore the statement that there is no difference across groups best captures the data.