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Identification of B and T cells in human spleen sections by infrared microspectroscopic imaging
Christoph Krafft1, Reiner Salzer, Gerhard Soff
1Institute for Analytical Chemistry, Dresden University of Technology, Dresden, Germany. christoph.krafft@chemie.tu-dresden.de
Insights
Infrared spectroscopic imaging offers a fast and standardized alternative to traditional methods for identifying immune cells in tissues. This technique shows comparable sensitivity and specificity to immunohistochemistry for distinguishing T and B cells.
Area of Science:
- Biomedical Optics
- Spectroscopy
- Immunohistochemistry
Background:
- Infrared spectroscopy analyzes chemical composition and molecular structure in biological systems.
- Infrared spectroscopic imaging provides spectral data with single-cell resolution.
- This study evaluates its competitiveness against immunohistochemical methods for immunologic tissues.
Purpose of the Study:
- To assess the efficacy of infrared spectroscopic imaging for analyzing immunologic tissue.
- To compare its performance with established immunohistochemical techniques.
- To explore its potential as an innovative tool for cell type distinction.
Main Methods:
- Infrared microspectroscopic mapping datasets were acquired from human spleen tissue.
- High-resolution imaging focused on specific anatomical regions like germinal centers and T zones.
- Results were cross-validated with immunohistochemical staining and isolated lymphocytes.
Main Results:
- Cluster analysis of infrared data successfully identified anatomical features, including follicles and T zones.
- Spectral differences between T and B lymphocytes were linked to DNA and cytosol contributions.
- Assignments were confirmed by comparing with immunohistochemically stained sections.
Conclusions:
- Infrared spectroscopic imaging demonstrates sensitivity and specificity comparable to standard staining for B and T cell identification.
- Advantages include speed, data throughput, and standardization due to minimal sample preparation.
- Highlights the potential of infrared spectroscopy for distinguishing cell types, especially in immunologic contexts.
Background:
Infrared spectroscopy probes the chemical composition and molecular structure of complex systems such as tissue and cells. Infrared spectroscopic imaging combines this spectral information with lateral resolution near the single-cell level. We analyzed whether this method is competitive with classic immunohistochemical methods for immunologic tissue and cells.
Methods:
We recorded infrared microspectroscopic mapping datasets with a 90- x 90-microm2 aperture from a 3- x 3-mm2 unstained tissue area of human spleen. A secondary follicle containing a germinal center and a T zone were studied in more detail by infrared microspectroscopic imaging with lateral resolution near 5 mum. The results were compared with consecutive sections stained by immunoglobulin D antibodies. T and B lymphocytes were extracted from human blood and served as independent test samples.
Results:
Cluster analysis of infrared datasets produced images that distinguished anatomical features such as primary and secondary follicles, T zones, arteries, and spleen red pulp. The assignments could be confirmed in consecutive sections by immunohistochemical staining. Main spectral variances between T and B lymphocytes in high-resolution measurements were attributed to specific spectral contributions of DNA and cytosol.
Conclusions:
Sensitivity and specificity of the infrared based methods are comparable to those of standard staining procedures for identification of B and T cells. However, infrared spectroscopic imaging can offer advantages in velocity, data throughput, and standardization because of minimal sample preparation. The results emphasize the potential of infrared spectroscopy as an innovative tool for the distinction of cell types, in particular in immunologic tissue.
