Enterocyte

Overview

Diagram of an enterocyte

An enterocyte is a type of cell found in the small intestine and is primarily responsible for the absorption of nutrients. These cells line the inner surface of the intestine and play a crucial role in the digestive system. Enterocytes are a type of epithelial cell and are characterized by their brush border, which is composed of microvilli.

Structure

Enterocytes are tall, columnar cells that are specialized for absorption. The apical surface of an enterocyte is covered with microvilli, which increase the surface area for absorption. This brush border is rich in enzymes that aid in the digestion of nutrients. The lateral surfaces of enterocytes are connected by tight junctions, which help maintain the integrity of the intestinal barrier.

Function

The primary function of enterocytes is the absorption of nutrients from the intestinal lumen. They absorb amino acids, monosaccharides, fatty acids, and other nutrients, which are then transported into the bloodstream. Enterocytes also play a role in the secretion of digestive enzymes and in the immune response of the gut.

Life Cycle

Enterocytes have a rapid turnover rate, with a lifespan of only a few days. They are continuously renewed from stem cells located in the crypts of Lieberkühn at the base of the intestinal villi. As new enterocytes are produced, older cells are shed into the intestinal lumen.

Clinical Significance

Damage to enterocytes can lead to malabsorption syndromes, where the body is unable to absorb nutrients effectively. Conditions such as celiac disease, Crohn's disease, and intestinal infections can affect the function and integrity of enterocytes.

Related pages

• Small intestine
• Digestive system
• Microvilli
• Epithelial cell