Human Milk Metabolic Hormones: Analytical Methods and Current Understanding

Area of Science:

• Human milk composition
• Endocrinology
• Infant nutrition

Background:

• Human milk (HM) contains peptide hormones like leptin and adiponectin crucial for infant growth and metabolic reprogramming.
• Existing studies on HM hormones are limited by heterogeneous designs and analytical methods.
• The complexity of the HM matrix necessitates specialized analytical approaches compared to plasma or urine.

Purpose of the Study:

• To review the limitations in analyzing peptide hormones in human milk.
• To highlight gaps in pre-analytical and analytical stages of HM hormone quantification.
• To emphasize the need for robust validation of methods for accurate HM hormone measurement.

Main Methods:

• Overview of quantification methods for HM metabolic hormones: immunoassay (ELISA, RIA), immunosensor, and chromatography.
• Discussion of pre-analytical (sample collection, preparation) and analytical challenges.
• Examination of relative validity parameters in HM hormone analysis.

Main Results:

• Immunoassay techniques, particularly ELISA and RIA, are predominantly used for HM hormone measurement.
• Significant heterogeneity exists in study designs, sample handling, and analytical techniques across HM hormone studies.
• Validation parameters for HM hormone analysis are frequently underreported, compromising data accuracy.

Conclusions:

• Accurate measurement of HM hormones requires addressing pre-analytical and analytical limitations.
• Standardized and validated methodologies are essential for a better understanding of HM hormones' role in infant outcomes.
• Improved analytical rigor will enhance knowledge of metabolic reprogramming in newborns fed human milk.