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Mapping O2 concentration in ex-vivo tissue samples on a fast PLIM macro-imager

Journal Article · · Scientific Reports
 [1];  [2];  [3];  [4];  [5];  [6];  [3];  [7];  [8];  [2]
  1. Univ. College Cork (Ireland). School of Bichemistry and Cell Biology; OSTI
  2. Univ. College Cork (Ireland). School of Bichemistry and Cell Biology
  3. Univ. College Cork (Ireland). APC Microbiome Ireland; Univ. College Cork (Ireland). Dept. of Anatomy and Neuroscience
  4. The Univ. of Western Australia, Crawley, WA (Australia). Centre for Microscopy, Characterisation and Analysis (CMCA)
  5. Czech Technical Univ., Prague (Czech Republic). Faculty of Nuclear Sciences and Physical Engineering. Dept. of Physics; Univ. of Manchester (United Kingdom). School of Natural Sciences. Dept. of Physics and Astronomy
  6. Univ. College Cork (Ireland). APC Microbiome Ireland
  7. Tyndall National Inst., Cork (Ireland). Irish Photonics Integration Centre
  8. Brookhaven National Lab. (BNL), Upton, NY (United States). Physics Dept.
O2 PLIM microscopy was employed in various studies, however current platforms have limitations in sensitivity, image acquisition speed, accuracy and general usability. We describe a new PLIM imager based on the Timepix3 camera (Tpx3cam) and its application for imaging of O2 concentration in various tissue samples stained with a nanoparticle based probe, NanO2-IR. Upon passive staining of mouse brain, lung or intestinal tissue surface with minute quantities of NanO2-IR or by microinjecting the probe into the lumen of small or large intestine fragments, robust phosphorescence intensity and lifetime signals were produced, which allow mapping of O2 in the tissue within 20 s. Inhibition of tissue respiration or limitation of O2 diffusion to tissue produced the anticipated increases or decreases in O2 levels, respectively. The difference in O2 concentration between the colonic lumen and air-exposed serosal surface was around 140 µM. Furthermore, subcutaneous injection of 5 µg of the probe in intact organs (a paw or tail of sacrificed mice) enabled efficient O2 imaging at tissue depths of up to 0.5 mm. Overall, the PLIM imager holds promise for metabolic imaging studies with various ex vivo models of animal tissue, and also for use in live animals.
Research Organization:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
SC0012704
OSTI ID:
1815680
Journal Information:
Scientific Reports, Journal Name: Scientific Reports Journal Issue: 1 Vol. 10; ISSN 2045-2322
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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