Human intestinal epithelial cell surface

The human intestinal epithelial cell surface is the primary interface between the body and the external environment of the gut lumen, consisting mainly of the apical membranes of enterocytes [1: Gupta et al., 2021, Frontiers in Physiology]. This surface is characterized by microvilli that form the brush border, which dramatically increases the surface area available for nutrient absorption and the activity of membrane-bound digestive enzymes [2: Crawley et al., 2014, Current Biology]. It functions as a selective semi-permeable barrier, regulated by tight junction proteins, which prevents the translocation of luminal pathogens and toxins while facilitating the uptake of essential nutrients and electrolytes [3: Turner, 2009, Nature Reviews Immunology]. In diseases such as inflammatory bowel disease (IBD) and celiac disease, the integrity of this surface is often compromised, leading to increased permeability and chronic inflammation [4: Soderholm & Perdue, 2001, Am J Physiol]. While not a single molecular target, the intestinal surface is a critical site for the action of locally acting drugs like mucosal protectants (e.g., sucralfate) and is the target for various oral drug delivery systems designed to enhance bioavailability [5: Date et al., 2016, Therapeutic Delivery].

Other names

Intestinal brush borderEnterocyte apical membraneIntestinal mucosal surfaceIntestinal epithelium

Drugs interacting with the intestinal epithelial surface typically act via local enzyme inhibition, physical mucosal protection, or by binding to specific receptors and transporters located on the apical membrane to modulate local physiological processes or systemic absorption.