Within the cellular compartment, ASBT immunolabeling is located in which enterocyte portion?

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Study for the ACVIM Small Animal Internal Medicine Exam to enhance your veterinary knowledge. Prepare with flashcards and multiple-choice questions, featuring hints and explanations. Ensure success in your exam journey!

Multiple Choice

Within the cellular compartment, ASBT immunolabeling is located in which enterocyte portion?

Explanation:
ASBT is the apical sodium-dependent bile acid transporter localized on the brush-border membrane of ileal enterocytes. This placement faces the intestinal lumen and is exactly where bile acids are taken up from the gut, driven by the sodium gradient. Immunolabeling for ASBT, therefore, appears at the apical surface. The basolateral membrane would handle export into portal blood, while mitochondria or intracellular cytoplasm/nucleus are not where this membrane transporter operates. After uptake at the apical side, bile acids are handed off to basolateral transporters to enter circulation.

ASBT is the apical sodium-dependent bile acid transporter localized on the brush-border membrane of ileal enterocytes. This placement faces the intestinal lumen and is exactly where bile acids are taken up from the gut, driven by the sodium gradient. Immunolabeling for ASBT, therefore, appears at the apical surface. The basolateral membrane would handle export into portal blood, while mitochondria or intracellular cytoplasm/nucleus are not where this membrane transporter operates. After uptake at the apical side, bile acids are handed off to basolateral transporters to enter circulation.

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