Digestive enzyme activity in small intestine

“Digestive enzyme activity in the small intestine” refers to the collective action of multiple **digestive enzymes** that break down food macromolecules into absorbable units within the lumen and at the brush border membrane of enterocytes. This is not a single molecular target but rather a physiological process involving several classes of hydrolases produced by both the pancreas and cells lining the small intestine[2][4][5][6]. Key digestive enzymes active in this region include: **From pancreatic secretions** (delivered into duodenum): - Amylase: breaks down starches into maltose and other disaccharides. - Lipase: digests triglycerides into fatty acids and monoglycerides. - Proteases (trypsin, chymotrypsin): further digest proteins into peptides. **From intestinal mucosa/brush border**: - Disaccharidases such as maltase, sucrase, lactase: convert disaccharides to monosaccharides like glucose. - Peptidases: break peptides down to amino acids. - Enterokinase/enteropeptidase activates trypsinogen from pancreas. These enzymatic activities are essential for nutrient absorption; deficiencies lead to maldigestion/malabsorption syndromes such as lactose intolerance or general malnutrition[3][4][5][7]. Because “digestive enzyme activity in small intestine” is not a discrete molecule but an aggregate function/process involving many different molecules with distinct genes/proteins/functions—and because it does not correspond directly to any canonical drug target—the entry is considered **incorrect as a therapeutic target name**, though individual constituent enzymes are valid targets themselves.

Other names

Small intestinal digestive enzymesIntestinal brush border enzymesEnzyme activity in small intestine