Abstract
The purpose of this study was to describe cytokine profiles of human neonatal pulmonary cells isolated by tracheal aspiration (TA) and by deep pulmonary lavage (DPL). We hypothesized that mRNA phenotyping, using the technique of reverse transcriptase polymerase chain reaction (RT-PCR), would reveal differences in cytokine expression patterns between cells from proximal and distal airway compartments. We reasoned that cells derived by DPL may reflect pathogenic pathways indicative for the development of bronchopulmonary dysplasia in the premature infant. Here we have described the detection of mRNA for IL-1α, IL-1β, IL-6, IL-8, and tumor necrosis factor-α. Fourteen paired TA and DPL samples from six premature infants were collected at 1, 7, or 28 d of age. Two of 14 samples were negative forβ-actin (a ubiquitous mRNA) by RT-PCR and were excluded from further analysis. Each of the remaining 12 samples expressed IL-8. Furthermore, each cytokine could be expressed by TA or DPL cells. Cytokine mRNA phenotype profiles were found to differ between TA and DPL cells in four of five paired samples. Our results show that cells retrieved from these two pulmonary compartments are sources for these cytokines and suggest that RT-PCR of TA/DPL cells can be used to test hypothetical predictive markers for the development of bronchopulmonary dysplasia.
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Abbreviations
- BAL:
-
bronchoalveolar lavage
- BPD:
-
bronchopulmonary dysplasia
- DPL:
-
deep pulmonary lavage
- RT:
-
reverse transcriptase
- PCR:
-
polymerase chain reaction
- TA:
-
tracheal aspirate
- TNF-α,:
-
tumor necrosis factor-α
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Acknowledgements
The authors thank Drs. Jack Finkelstein and Carl D'Angio for their suggestions and comments, and Jon Carlson, Linda Reubens, and Kathy Brown for their help.
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Supported by grants from the National Institutes of Health (SCOR HL-36543), March of Dimes (R.A.S.), and Strong Children's Research Center Student Summer Fellowship (C.M.B.).
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LoMonaco, M., Barber, C. & Sinkin, R. Differential Cytokine mRNA Expression by Neonatal Pulmonary Cells. Pediatr Res 39, 248–252 (1996). https://doi.org/10.1203/00006450-199602000-00010
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DOI: https://doi.org/10.1203/00006450-199602000-00010
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