Visualization of pulmonary clearance mechanisms via noninvasive optical imaging validated by near-infrared flow cytometry

Haiying Zhou, Sean P. Gunsten, Natalia G. Zhegalova, Sharon Bloch, Samuel Achilefu, J. Christopher Holley, Daniel Schweppe, Walter Akers, Steven L. Brody, William C. Eades, Mikhail Y. Berezin

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

In vivo optical imaging with near-infrared (NIR) probes is an established method of diagnostics in preclinical and clinical studies. However, the specificities of these probes are difficult to validate ex vivo due to the lack of NIR flow cytometry. To address this limitation, we modified a flow cytometer to include an additional NIR channel using a 752 nm laser line. The flow cytometry system was tested using NIR microspheres and cell lines labeled with a combination of visible range and NIR fluorescent dyes. The approach was verified in vivo in mice evaluated for immune response in lungs after intratracheal delivery of the NIR contrast agent. Flow cytometry of cells obtained from the lung bronchoalveolar lavage demonstrated that the NIR dye was taken up by pulmonary macrophages as early as 4-h post-injection. This combination of optical imaging with NIR flow cytometry extends the capability of imaging and enables complementation of in vivo imaging with cell-specific studies.

Original languageEnglish (US)
Pages (from-to)419-427
Number of pages9
JournalCytometry Part A
Volume87
Issue number5
DOIs
StatePublished - May 1 2015
Externally publishedYes

Keywords

  • Alveolar macrophage
  • Flow cytometry
  • In vivo imaging
  • Lung imaging
  • Near-infrared

ASJC Scopus subject areas

  • Pathology and Forensic Medicine
  • Histology
  • Cell Biology

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