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2018 ; 19
(1
): 102
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Sequential broncho-alveolar lavages reflect distinct pulmonary compartments:
clinical and research implications in lung transplantation
#MMPMID29801490
Levy L
; Juvet SC
; Boonstra K
; Singer LG
; Azad S
; Joe B
; Cypel M
; Keshavjee S
; Martinu T
Respir Res
2018[May]; 19
(1
): 102
PMID29801490
show ga
BACKGROUND: Bronchoalveolar lavage (BAL) has proven to be very useful to monitor
the lung allograft after transplantation. In addition to allowing detection of
infections, multiple BAL analytes have been proposed as potential biomarkers of
lung allograft rejection or dysfunction. However, BAL collection is not well
standardized and differences in BAL collection represent an important source of
variation. We hypothesized that there are systematic differences between
sequential BALs that are relevant to BAL analysis. METHODS: As part of 126
consecutive bronchoscopies in lung transplant recipients, two sequential BALs
(BAL1 and BAL2) were performed in one location during each bronchoscopy by
instilling and suctioning 50 ml of normal saline twice into separate containers.
Cell concentration, viability and differentials, Surfactant Protein-D (SP-D),
Club Cell Secretory Protein (CCSP), and levels of CXCL10, IL-10, CCL2, CCL5,
VEGF-C, RAGE, CXCL9, CXCL1, IL-17A, IL-21, PDGF, and GCSF were compared between
BAL1 and BAL2. RESULTS: Total cell concentration did not differ between BAL1 and
BAL2; however, compared to BAL2, BAL1 had more dead cells, epithelial cells,
neutrophils, and higher concentrations of airway epithelium-derived CCSP and
inflammatory markers. BAL2 had a higher concentration of SP-D compared to BAL1.
CONCLUSION: In this study performed in lung transplant recipients, we show that
sequential BALs represent different lung compartments and have distinct
compositions. BAL1 represents the airway compartment with more epithelial cells,
neutrophils, and epithelium-derived CCSP. Conversely, BAL2 samples preferentially
the distal bronchoalveolar space with greater cell viability and higher SP-D. Our
findings illustrate how the method of BAL collection can influence analyte
concentrations and further emphasize the need for a standardized approach in
translational research involving BAL samples.