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FLIM Imaging of NAD(P)H to track metabolic changes of non-adherent leukemia cells using micro cell trapping arrays
Author(s): Ruofan Cao; Horst Wallrabe; Chunbo Huang; Su-Fern Tan; David Feith; Yuan Xing; Yong Wang; Jose Oberholzer; Mark Kester; Thomas P. Loughran; Ammasi Periasamy
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Paper Abstract

Fluorescence lifetime imaging microscopy (FLIM) techniques are widely used in auto-fluorescence imaging to investigate dynamic metabolic states of the cells. Traditional FLIM imaging requires the cells to adhere to the coverslip to collect enough photons for FLIM data processing. Such conditions pose challenges to non-adherent cells, such as acute myeloid leukemia (AML) cells, because of cell motility. We developed a proto-type micro cell trapping array (MCTA) to immobilize cells in picoliter-size wells with location references. The array keeps non-adherent cells in referenced well locations, allows treatment on stage and re-imaging after time for ultimate cell segmentation analysis. Individual wells are analyzed by a pixel-based region-of-interest (ROI) to analyze cellular redox states. This single well trapping and analysis method allows to isolate treatment responses of a small number of cells, compare their range and predict early effect, which may have clinical applications in the context of cancer aggressiveness and treatment outcomes. We expanded the common intensity-based assay for cellular redox state by a Fluorescence Lifetime measurement, NAD(P)H-a2%, serving as an alternative metric. The new assay is flexible and can be applied to other non-adherent cell lines, expanding FLIM applications in both research and the clinic.

Paper Details

Date Published: 29 March 2019
PDF: 13 pages
Proc. SPIE 10873, Optical Biopsy XVII: Toward Real-Time Spectroscopic Imaging and Diagnosis, 108730P (29 March 2019); doi: 10.1117/12.2508759
Show Author Affiliations
Ruofan Cao, Univ. of Virginia (United States)
Horst Wallrabe, Univ. of Virginia (United States)
Chunbo Huang, Univ. of Virginia (United States)
Su-Fern Tan, Univ. of Virginia (United States)
David Feith, Univ. of Virginia (United States)
Yuan Xing, Univ. of Virginia (United States)
Yong Wang, Univ. of Virginia (United States)
Jose Oberholzer, Univ. of Virginia (United States)
Mark Kester, Univ. of Virginia (United States)
Thomas P. Loughran, Univ. of Virginia (United States)
Ammasi Periasamy, Univ. of Virginia (United States)


Published in SPIE Proceedings Vol. 10873:
Optical Biopsy XVII: Toward Real-Time Spectroscopic Imaging and Diagnosis
Robert R. Alfano; Stavros G. Demos; Angela B. Seddon, Editor(s)

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