Lactoferrin induces concentration-dependent functional modulation of intestinal proliferation and differentiation

Area of Science:

• Human milk composition and infant nutrition
• Gastroenterology and developmental biology
• Molecular and cellular biology

Background:

• Human milk contains various bioactive components that promote infant intestinal development.
• Lactoferrin (LF), a key human milk glycoprotein, is known to support enterocyte growth.
• The specific effects of LF concentration on intestinal cell proliferation and differentiation require further elucidation.

Purpose of the Study:

• To investigate the dose-dependent effects of human-native LF (N-LF) on Caco-2 cell proliferation and differentiation.
• To compare the potency of N-LF with iron-saturated LF (I-LF) and bovine LF (bLF).

Main Methods:

• Utilized Caco-2 cells, a human colon adenocarcinoma cell line.
• Assessed cell proliferation via 3H-thymidine incorporation.
• Measured sucrase and lactase activities and their mRNA levels to evaluate differentiation.
• Compared the effects of N-LF, I-LF, and bLF at varying concentrations.

Main Results:

• High concentrations of N-LF stimulated Caco-2 cell proliferation.
• Low concentrations of N-LF increased sucrase and lactase activity and mRNA expression, indicating a transcriptional effect.
• Native LF was more potent than I-LF, suggesting iron binding is not the sole mechanism.
• Bovine LF demonstrated greater potency than human LF in promoting cell growth and lactase expression.

Conclusions:

• Human milk lactoferrin directly influences enterocyte growth and proliferation in a concentration-dependent manner.
• LF plays a significant role in regulating early postnatal intestinal development.
• Bovine LF holds potential as a growth factor in infant formula for specific intestinal conditions.