In vitro cell-mediated immunologic assay for cow's milk allergy

Area of Science:

• Immunology
• Pediatric Allergy
• Cell-Mediated Immunity

Background:

• Cow's milk protein allergy is a common concern in infants and children.
• Accurate diagnosis is crucial for effective management and preventing complications.
• Existing diagnostic methods like provocation tests carry risks and ethical concerns.

Purpose of the Study:

• To evaluate the diagnostic utility of leukocyte-migration-inhibition factor (LIF) production for cow's milk protein allergy.
• To assess LIF as a reliable indicator of cell-mediated immune response to bovine beta-lactoglobulin.
• To determine if LIF assay can guide dietary management and its safe cessation.

Main Methods:

• Assay of LIF production by peripheral blood lymphocytes in response to in vitro challenge with bovine beta-lactoglobulin.
• Study groups included infants and children with confirmed milk allergy, normal controls, recovered milk allergy patients, newborns, and those with acute gastroenteritis.
• Comparison of LIF production percentages between study groups and control subjects.

Main Results:

• Patients with cow's milk allergy showed significantly higher LIF production (23.5% +/- 6.4%) compared to normal controls (3.1% +/- 4.3%, P < .0005).
• False positive results were minimal in control subjects and newborns.
• Most children who recovered from milk allergy and were consuming milk had negative LIF assays.

Conclusions:

• The leukocyte-migration-inhibition factor (LIF) assay is a reliable cell-mediated immune test for diagnosing milk protein sensitivity in pediatric populations.
• This assay can aid in determining appropriate dietary interventions and the safe discontinuation of elimination diets.
• The LIF test offers a safer alternative to provocation tests and repeated intestinal biopsies for diagnosing milk allergy.