What is the primary fuel for colonocytes?

What is the primary fuel for colonocytes?

• A. Medium chain fatty acids
• B. Glucose
• C. Glutamine
• D. Short chain fatty acids

Answer: (D)

Colonocytes rely predominantly on butyrate, a short-chain fatty acid produced by microbiota fermenting dietary fiber in the colon, as their main energy source. Butyrate is taken up by the colonocytes and oxidized in mitochondria to acetyl-CoA, fueling the TCA cycle and producing the ATP needed to maintain barrier function and mucosal health. While glucose can be used, and glutamine supports mucosal integrity, neither provides energy for colonocytes as efficiently as butyrate in this environment. Medium-chain fatty acids are absorbed and utilized differently, typically elsewhere in the body, not as the primary fuel for colonocytes. So the best choice is short chain fatty acids.

Colonocytes rely predominantly on butyrate, a short-chain fatty acid produced by microbiota fermenting dietary fiber in the colon, as their main energy source. Butyrate is taken up by the colonocytes and oxidized in mitochondria to acetyl-CoA, fueling the TCA cycle and producing the ATP needed to maintain barrier function and mucosal health. While glucose can be used, and glutamine supports mucosal integrity, neither provides energy for colonocytes as efficiently as butyrate in this environment. Medium-chain fatty acids are absorbed and utilized differently, typically elsewhere in the body, not as the primary fuel for colonocytes. So the best choice is short chain fatty acids.