Which lipoprotein is produced in the intestinal mucosa?

Which lipoprotein is produced in the intestinal mucosa?

• A. HDL
• B. Chylomicrons
• C. VLDL
• D. LDL

Answer: (B)

The main concept here is how dietary lipids are packaged and transported after absorption. Chylomicrons are the lipoproteins assembled in the intestinal mucosa (enterocytes) from absorbed dietary fats. They incorporate triglycerides and cholesterol with apolipoprotein B-48, are released into the lymphatic system, and then enter the bloodstream. In the capillaries, lipoprotein lipase hydrolyzes their triglycerides to release fatty acids for tissues, leaving behind chylomicron remnants that return to the liver for clearance. This intestinal origin distinguishes them from other lipoproteins: VLDL and LDL are produced primarily by the liver (VLDL carries hepatic triglycerides and becomes LDL as triglycerides are removed), while HDL is mainly produced by the liver (and to some extent the intestine) and functions in reverse cholesterol transport. Thus, the lipoprotein produced in the intestinal mucosa is chylomicrons.

The main concept here is how dietary lipids are packaged and transported after absorption. Chylomicrons are the lipoproteins assembled in the intestinal mucosa (enterocytes) from absorbed dietary fats. They incorporate triglycerides and cholesterol with apolipoprotein B-48, are released into the lymphatic system, and then enter the bloodstream. In the capillaries, lipoprotein lipase hydrolyzes their triglycerides to release fatty acids for tissues, leaving behind chylomicron remnants that return to the liver for clearance. This intestinal origin distinguishes them from other lipoproteins: VLDL and LDL are produced primarily by the liver (VLDL carries hepatic triglycerides and becomes LDL as triglycerides are removed), while HDL is mainly produced by the liver (and to some extent the intestine) and functions in reverse cholesterol transport. Thus, the lipoprotein produced in the intestinal mucosa is chylomicrons.