IGE in human urine and milk

Area of Science:

• Immunology
• Clinical Chemistry

Background:

• Immunoglobulin E (IgE) is primarily known for its role in allergic reactions.
• The presence and potential synthesis of IgE in non-traditional biological fluids like urine and milk are not well-established.

Purpose of the Study:

• To investigate the presence and levels of IgE in human urine from healthy adults.
• To examine IgE concentrations in human milk and colostrum, particularly in the postpartum period and in mothers with allergies.

Main Methods:

• Urine samples from healthy adult volunteers were collected and analyzed for IgE levels.
• Milk and colostrum samples from postpartum women, including those with allergies, were tested for IgE presence.

Main Results:

• Low levels of IgE (0.003-0.010 IU/ml) were detected in healthy adult urine, with a 24-h excretion rate of 3-16 IU.
• IgE was largely absent in milk and colostrum, with trace amounts found only in early postpartum samples (1-2 days).
• Low IgE concentrations were observed in mammary secretions from two severely allergic donors.

Conclusions:

• The low levels of IgE in urine and milk suggest that significant IgE synthesis does not occur in the urinary tract or mammary tissue.
• These findings may indicate passive transfer or filtration of IgE into these bodily fluids rather than local production.