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Different BALF protein composition in normal children and adults
Insights
Protein levels in bronchoalveolar lavage fluid (BALF) differ between healthy children and adults. This study highlights the need for distinct reference values for pediatric BALF protein quantification to ensure accurate clinical interpretation.
Area of Science:
- Pulmonary Medicine
- Clinical Chemistry
- Pediatric Research
Background:
- Quantification of proteins in bronchoalveolar lavage fluid (BALF) is increasingly utilized for understanding disease.
- BALF protein analysis offers insights into pathophysiological processes and potential clinical relevance.
Purpose of the Study:
- To compare BALF protein concentrations between healthy children and adults.
- To investigate differences in plasma-derived and locally produced proteins in BALF.
- To assess the impact of smoking on BALF protein levels in adults.
Main Methods:
- Studied 37 healthy children and 16 healthy adults.
- Bronchoalveolar lavage (BAL) performed using normal saline.
- Chemiluminescence immunoassays used to quantify specific proteins including alpha 1-proteinase inhibitor, alpha 2-macroglobulin, albumin, myeloperoxidase, lactoferrin, elastase, and fibronectin.
Main Results:
- Plasma protein concentrations (alpha-1PI, alpha 2PI, Alb) were higher in children than adults.
- Locally released proteins (MPO, Lf, Ela, Fib) showed similar concentrations in both groups.
- In adults, the first BAL aliquot revealed distinct protein concentrations compared to subsequent aliquots, with higher MPO, Lf, and Ela, and lower alpha 1PI, alpha 2PI, and Alb. Smokers exhibited higher BALF albumin, alpha 1PI, and MPO levels than nonsmokers.
Conclusions:
- Significant differences exist in BALF protein concentrations between normal children and adults.
- The findings necessitate the establishment of independent reference values for pediatric BALF protein analysis.
- This is crucial for accurate interpretation of BALF protein quantification in children.
Unlabelled:
Quantification of proteins in bronchoalveolar lavage fluid (BALF) is being performed increasingly, because of their potency in elucidating pathophysiological processes and their possible clinical relevance.
Study Population:
37 normal children (12 female, 25 male, mean age +/- SD 7.9 +/- 3.5 years, range 3-16 years) undergoing elective surgery for nonpulmonary illnesses and 16 healthy adults (all male, mean age +/- SD 24.7 +/- 2.6 years, range 20-28 years, 8 smokers, 8 nonsmokers) have been studied after approval by the ethics committees of both institutions.
Methods:
BAL was performed with normal saline in the right middle lobe or one of its segments. Lavage volume was 15 x 20 ml in adults and 3 x 1 ml/kg in children. In adults the first aliquot was processed separately, 2 aliquots of the following were pooled (resulting in 8 different fractions) so that different lavage protocols could be calculated. The concentrations of the plasma-proteins alpha 1-proteinase inhibitor (alpha-1PI), alpha 2-macroglobulin (alpha 2PI), albumin (Alb) and of the locally released proteins myeloperoxidase (MPO), lactoferrin (Lf), elastase (Ela) and fibronectin (Fib) were determined in BALF using chemiluminescence immunoassays.
Results:
The BALF concentrations of the plasma proteins were higher in children compared to adults. In contrast, concentrations of the locally released proteins were similar in both groups. Protein concentrations in the first recovered aliquot were different from the following in healthy adults with higher values of MPO, Lf and Ela and lower concentrations of alpha 1PI, alpha 2PI and Alb. Subsequent aliquots did not show a progressive dilution of these proteins with increasing lavage volumes. In smokers, BALF concentrations of albumin, alpha 1PI and MPO were higher compared to nonsmokers.
Conclusion:
BALF protein concentrations are different in normal children and adults. These results underscore the necessity to establish independent reference values for children, as could be demonstrated earlier with regard to BAL cell composition.