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Intravital Imaging of Intraepithelial Lymphocytes in Murine Small Intestine
Published on: June 24, 2019
Quantification of Lacteal Contractility by Live Intravital Imaging
1Toronto General Hospital Research Institute, University Health Network, Toronto, Ontario, Canada.
Microcirculation (New York, N.Y. : 1994)
|July 29, 2026
Summary
This study introduces a new intravital imaging workflow to quantify lacteal contractility in rats. The method improves analysis by using signal normalization and longer recording windows for clearer results.
Area of Science:
- Physiology
- Intravital Microscopy
- Lymphatic System Research
Background:
- Lacteal motion visualization is possible in vivo, but quantitative analysis is challenging.
- Intravital intestinal imaging is hampered by motion, focal instability, and baseline fluorescence variability.
Purpose of the Study:
- To develop and validate an intravital imaging workflow for quantitative analysis of lacteal contractility.
- To address challenges in live intestinal imaging for lymphatic research.
Main Methods:
- Developed an intravital imaging workflow for Prox1-EGFP rats.
- Segmented lacteals and extracted/normalized fluorescence signals.
- Assessed contractility using normalized traces and compared 30s vs. 10s analysis windows.
Main Results:
- Mean-normalized signals offered a more comparable readout than raw intensity.
- The workflow successfully detected acetylcholine-induced increases in lacteal contractility.
- 30s analysis windows provided a more coherent and interpretable readout than 10s windows.
Conclusions:
- Established a practical intravital workflow for quantifying lacteal contractility in vivo.
- Defined key analytical considerations for live intestinal imaging, including normalization and window selection.
