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Transfer of cow's milk beta-lactoglobulin to human serum after a milk load: a pilot study
J A Lovegrove1, D L Osman, J B Morgan
1Division of Biomedical Research, School of Biological Sciences, University of Surrey, Guildford.
Insights
A new assay quantifies cow's milk beta-lactoglobulin in human serum. This study found that cow's milk protein antigen transfers into the bloodstream in most healthy adults, showing a biphasic absorption pattern.
Area of Science:
- Immunology
- Food Science
- Biochemistry
Background:
- Cow's milk allergy is a common concern.
- Understanding milk protein transfer in non-allergic individuals is crucial.
- Previous methods lacked sensitivity for detecting low antigen levels.
Purpose of the Study:
- To develop a sensitive and specific assay for quantifying cow's milk beta-lactoglobulin (BGL) in human serum.
- To investigate the absorption kinetics of BGL and BGL IgG antibody levels after a milk load in healthy adults.
- To determine if food antigen transfer occurs in healthy non-allergic individuals.
Main Methods:
- Development of a highly sensitive and specific enzyme-linked immunosorbent assay (ELISA) for BGL quantification.
- Measurement of BGL antigen and BGL IgG antibody levels in serum samples from eight healthy non-allergic adults over a six-hour period post-milk consumption.
- Statistical analysis to assess variations in antigen and antibody levels over time and their correlation.
Main Results:
- The developed ELISA demonstrated high sensitivity (80 pg/ml) and specificity, with no significant cross-reactivity with other milk proteins.
- Significant variation in circulating BGL antigen levels was observed over the six hours, with a biphasic absorption pattern in most subjects.
- No significant changes in BGL IgG antibody levels were detected, and no correlation was found between BGL antigen and antibody levels.
Conclusions:
- The sensitive ELISA allows for the quantification of cow's milk BGL in human serum.
- Food antigen transfer, specifically cow's milk BGL, occurs in the majority of healthy non-allergic adults.
- A biphasic absorption profile of cow's milk antigen into the bloodstream was confirmed in healthy adults.
Abstract:
A sensitive and specific enzyme linked immunosorbent assay (ELISA) was developed for the quantification of cow's milk beta-lactoglobulin in human serum. The assay had a sensitivity of 80 pg/ml (2 standard deviations from zero) and did not cross react significantly with any other tested milk proteins. The absorption of cow's milk beta-lactoglobulin and beta-lactoglobulin immunoglobulin G antibody levels after a milk load was investigated in eight healthy non-allergic individuals. There was a significant variation in the circulating beta-lactoglobulin antigen levels during the six hour period after feeding (p < 0.01) for the combined data. A biphasic absorption pattern was seen in all subjects except one subject who had undetectable levels. No significant variation with time was observed for the beta-lactoglobulin IgG antibody levels and no correlation was found between the beta-lactoglobulin antigen levels and the beta-lactoglobulin IgG antibody levels. This pilot study offered information on the quantity of immunogenic cows' milk protein transferred to the blood after a milk load in non-allergic healthy adults and confirmed a biphasic profile of antigen transfer. The sensitivity of the assay used has shown that transfer of food antigen does occur in the majority of healthy nonallergic subjects.
