Epidermal growth factor in cow's milk and milk formulas

Area of Science:

• Biochemistry
• Pediatrics
• Nutrition Science

Background:

• Epidermal Growth Factor (EGF) plays a crucial role in cellular growth and development.
• EGF is naturally present in human milk, contributing to infant health.
• The presence and levels of EGF in infant formulas are not well-established.

Purpose of the Study:

• To quantify Epidermal Growth Factor (EGF) levels in human milk, cow's milk, and various infant milk formulas.
• To compare the EGF content across different milk sources.
• To assess the potential nutritional implications of EGF absence in infant formulas.

Main Methods:

• Radioreceptor Assay (RRA) was employed to measure EGF.
• Human placental membrane was utilized as the EGF receptor for the assay.
• Samples analyzed included human milk, raw cow's milk, pasteurized cow's milk, and ten different commercial milk formulas.

Main Results:

• Raw and pasteurized cow's milk contained substantial RRA-EGF (324.2 ng/ml and 155.0 ng/ml, respectively).
• EGF levels in cow's milk, when normalized for protein content, were comparable to those in human milk.
• No detectable RRA-EGF was found in 9 out of 10 tested milk formulas; one formula contained a minimal amount.

Conclusions:

• Cow's milk possesses significant levels of EGF, similar to human milk on a protein-adjusted basis.
• Most commercial infant milk formulas lack detectable amounts of EGF.
• The absence of EGF in infant formulas may warrant further investigation regarding infant development and health.