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Alpha-1 antichymotrypsin levels are actively increased in normal colostrum
C Urueña1, J J Tellería, A Blanco-Quirós
1Department of Pediatrics, University of Valladolid, Spain.
Journal of Pediatric Gastroenterology and Nutrition
|May 15, 1998
Summary
Human colostrum contains higher levels of alpha-1 antichymotrypsin, suggesting local production and a specific role in infant nutrition. Other antiproteases were undetectable or significantly lower than in serum.
Area of Science:
- Human lactation immunology
- Neonatal nutrition
- Protease inhibitor biochemistry
Background:
- Human colostrum possesses known anti-inflammatory properties.
- Protease inhibitors play a role in regulating inflammation and tissue breakdown.
Purpose of the Study:
- To quantify antiprotease levels in human colostrum and serum.
- To investigate the origin and characteristics of colostral protease inhibitors.
- To assess the significance of local synthesis versus passive transfer.
Main Methods:
- Quantification of five protease inhibitors using radial immunodiffusion.
- Analysis of simultaneous colostrum and serum samples from 50 postpartum women.
- Electrophoretic and Western blot analysis of alpha-1 antichymotrypsin.
Main Results:
- Antithrombin II, inter-alpha trypsin inhibitor, and alpha-2 macroglobulin were undetectable in colostrum.
- Colostrum antitrypsin levels were 6% of serum levels.
- Colostrum alpha-1 antichymotrypsin levels were elevated (41% of serum) and showed distinct electrophoretic mobility and Western blot patterns compared to serum.
Conclusions:
- Local production of alpha-1 antichymotrypsin in breast epithelial cells is likely.
- Elevated and distinct alpha-1 antichymotrypsin in colostrum suggests a specific role in infant nutrition.
- The findings highlight unique immunological components in colostrum beyond passive transfer.