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The Pattern of Elastic Fiber Breakdown in Bleomycin-Induced Pulmonary Fibrosis May Reflect Microarchitectural Changes

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Abstract

Introduction

Desmosine and isodesmosine (DID) are unique elastin crosslinks that may serve as biomarkers for elastic fiber degradation in chronic obstructive pulmonary disease. Previously, our laboratory found that the ratio of free to peptide-bound DID in bronchoalveolar lavage fluid (BALF) showed a significant positive correlation with the extent of airspace enlargement in an elastase model of pulmonary emphysema. To further evaluate this hypothesis, our laboratory measured this ratio in a bleomycin (BLM) model of pulmonary fibrosis, which involved different microarchitectural changes than those associated with pulmonary emphysema.

Methods

Syrian hamsters were instilled intratracheally with 1.0 unit BLM in 0.2 ml of normal saline (controls received the vehicle alone), and BALF was analyzed for both free and total DID, using a combination of liquid chromatography and tandem mass spectrometry.

Results

Total BALF DID was significantly increased in hamsters receiving BLM at 1 week post-treatment (92 vs 13 pg/ml; p < 0.001), consistent with elastic fiber degradation. However, in contrast to elastase-induced emphysema, free/bound DID was lower in BLM-treated animals compared to controls at both 1 week (0.76 vs 0.84) and 2 weeks post-treatment (0.69 vs 0.86), though the differences were not statistically significant.

Conclusions

These results indicate that it may be possible to identify specific pulmonary microarchitecture changes, based on the ratio of free to peptide-bound DID. It is speculated that the proportionate decrease in free DID in BLM-induced fibrosis may be due to preservation of intact elastic fibers as the lung injury progresses.

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Authors and Affiliations

  1. Department of Pharmaceutical Sciences, St John’s University, New York, 11439, NY, USA

    Xingjian Liu & Jerome Cantor

  2. Department of Medicine, Mount Sinai St Luke’s Hospital, Queens, 10025, NY, USA

    Shuren Ma, Gerard Turino & Jerome Cantor

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  1. Xingjian Liu
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  2. Shuren Ma
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  3. Gerard Turino
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  4. Jerome Cantor
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Correspondence to Jerome Cantor.

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Liu, X., Ma, S., Turino, G. et al. The Pattern of Elastic Fiber Breakdown in Bleomycin-Induced Pulmonary Fibrosis May Reflect Microarchitectural Changes. Lung 195, 93–99 (2017). https://doi.org/10.1007/s00408-016-9956-2

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  • DOI: https://doi.org/10.1007/s00408-016-9956-2

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