In ileum ISH ASBT expression in CIE dogs vs controls?

• A. Significantly higher
• B. Not detected
• C. Significantly lower
• D. Numerically lower but not significantly different

Answer: (D)

The main point here is how inflammation in the ileum can affect a specific transporter’s gene expression and how that is interpreted when measured by in situ hybridization. ASBT (the apical sodium–bile acid transporter) is normally expressed in ileal enterocytes, and ISH detects its mRNA within tissue sections, giving a picture of how much transcript is present in the mucosa.

In dogs with chronic inflammatory enteropathy, inflammation can influence gene expression, sometimes lowering transporters like ASBT. The finding described indicates a numerical decrease in ileal ASBT mRNA signal in CIE dogs compared with controls, but the difference did not reach statistical significance. That means there is a trend toward lower expression, yet the data aren’t strong enough to rule out that the observed difference could be due to random variation. Factors such as sample size, variability between dogs, disease severity, and technical sensitivity of the ISH assay can all affect significance.

It’s also important to remember that ISH measures mRNA, not protein or transporter function. Even if transcript levels aren’t significantly different, post-transcriptional regulation or protein activity could vary. So the takeaway is a trend toward lower ASBT expression in the disease group, but not a statistically solid difference.