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Respir Med. 2013 Apr;107(4):587-95. doi: 10.1016/j.rmed.2012.12.006. Epub 2013 Jan 10.

HOPE-preservation of paraffin-embedded sputum samples--a new way of bioprofiling in COPD.

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  • 1Pulmonary Research Institute at Hospital Grosshansdorf, Center for Pneumology and Thoracic Surgery, Grosshansdorf, Germany. f.pedersen@pulmoresearch.de


Induced sputum is a non-invasive sampling technique for the analysis of airway inflammation in various lung diseases and comprises valuable potential for the identification of biomarkers and therapeutic targets by molecular methods. In the context of biobanking with preservation of induced sputum samples for subsequent analyses we applied the HEPES-glutamic acid buffer-mediated organic solvent protection effect (HOPE)-technique for preparation of induced sputum samples. Induced sputum samples of 20 patients with moderate to severe chronic obstructive pulmonary disease (COPD) and 12 healthy controls were collected. Cell pellets of induced sputum samples were preserved with HOPE and subsequently embedded in paraffin. Immunostaining of paraffin-block sections for interleukin-8, interleukin-17, myeloperoxidase, matrixmetalloproteinase-9, CD68, and CD8 revealed distinct signals without antigen retrieval. Moreover, RNA was extracted and successfully used for transcription microarray analysis. Sputum samples preserved by the HOPE-technique display a tool to address scientific approaches in pulmonary research, which can enable the identification of new biomarkers and therapeutic targets in respiratory diseases.

Copyright © 2012 Elsevier Ltd. All rights reserved.

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