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Imaging of whole tumor cut sections using a novel scanning beam confocal fluorescence MACROscope
P Constantinou1, V Vukovic, H K Haugland
1Ontario Cancer Institute/University of Toronto, Department of Medical Biophysics, Division of Biophysics, Toronto, Ontario M5G 2M9, Canada.
Abstract:
Hypoxia caused by inadequate structure and function of the tumor vasculature has been found to negatively determine the prognosis of cancer patients. Hence, understanding the biological basis of tumor hypoxia is of significant clinical interest. To study solid tumor microenvironments in sufficient detail, large areas (several mm in diameter) need to be imaged at microm resolutions. We have used a novel confocal scanning laser MACROscope (CSLM) capable of acquiring images over fields of view up to 2cm x 2cm. To demonstrate its performance, frozen sections from a cervical carcinoma xenograft were triple labeled for tissue hypoxia, blood vessels and hypoxia-inducible transcription factor 1 alpha (HIF-1alpha), imaged using the CSLM and compared to images obtained using a standard epifluorescence microscope imaging system. The results indicate that the CSLM is a useful instrument for imaging tissue-based fluorescence at resolutions comparable to standard low-power microscope objectives.
Insights
Tumor hypoxia negatively impacts cancer patient prognosis. A novel confocal scanning laser macroscope (CSLM) enables detailed imaging of large tumor areas at high resolution, aiding in understanding tumor microenvironments.
Area of Science:
- Oncology
- Biomedical Imaging
- Cancer Biology
Background:
- Tumor hypoxia, arising from poor tumor vasculature, is a critical factor negatively affecting cancer patient prognosis.
- Understanding the biological underpinnings of tumor hypoxia is crucial for clinical advancement.
- Studying solid tumor microenvironments necessitates high-resolution imaging over large tissue areas.
Purpose of the Study:
- To introduce and evaluate a novel confocal scanning laser macroscope (CSLM) for imaging large tissue sections.
- To assess the CSLM's capability in resolving micro-scale details within tumor microenvironments.
- To compare CSLM performance against standard epifluorescence microscopy for tissue imaging.
Main Methods:
- Utilized a novel confocal scanning laser macroscope (CSLM) with a field of view up to 2cm x 2cm.
- Imaged triple-labeled frozen sections of cervical carcinoma xenografts.
- Labeled tissues for: tissue hypoxia, blood vessels, and hypoxia-inducible transcription factor 1 alpha (HIF-1alpha).
- Compared CSLM images with those from a standard epifluorescence microscope.
Main Results:
- The CSLM successfully acquired images over large fields of view (up to 2cm x 2cm).
- CSLM imaging provided high-resolution data comparable to standard low-power microscope objectives.
- Demonstrated the CSLM's utility in visualizing complex tissue structures and molecular markers within tumor sections.
Conclusions:
- The confocal scanning laser macroscope (CSLM) is a valuable tool for high-resolution imaging of large tissue areas.
- CSLM facilitates detailed analysis of tumor microenvironments, including hypoxia and associated molecular factors.
- This technology aids in advancing the understanding of tumor biology and its clinical implications.