Dedicated to advancing applied science, Dr. Dirk Schaudien is a Veterinary Pathologist with a specialization in toxicopathology. He leads an experienced team offering comprehensive pathology services to industry clients, research institutions, and universities. The team brings deep expertise in toxicological pathology, tumor histopathology, and immunohistochemical characterization. Their work also includes conducting toxicity and carcinogenicity studies, as well as cell proliferation investigations, all in accordance with Good Laboratory Practice (GLP) standards.
Since 2018, their state-of-the-art facilities include digital pathology scanners from Hamamatsu Photonics, expanding their research capabilities. Dr. Dirk Schaudien explains that the department invested in glass slide scanners to facilitate image analysis and documentation of special cases. Unlike standard clinical pathology departments, their lab does not have a continuous daily flow of samples.
“We experience peaks in slide production associated with specific projects. Suddenly, we might have thousands of samples that need to be scanned,” he says. “In addition to handling brightfield (BF) samples, we also use fluorescent multiplexing for example to characterize different types of lymphocytes. That’s why we decided on two Hamamatsu scanners, the NanoZoomer S210 for its high capacity and throughput and the NanoZoomer S60 with its fluorescent unit. The S60 not only gives us additional capacity to scan BF samples during peak times but also allows us to scan fluorescent multiplex samples.”
Dr. Dirk Schaudien with a NanoZoomer® S60.
The Pathology team maximized the capabilities of their NanoZoomer S60, pushing it beyond standard usage. Collaborating with Hamamatsu’s application engineers, they developed a customized setup that allows the scanning of seven fluorescent channels on a single sample—surpassing the typical five or six channels. This was achieved thanks to the NanoZoomer S60’s flexible design, which accommodates multiple excitation and emission filter sets and beam splitters, allowing the team to expand the scanning capabilities beyond typical standards (see Fig. 1).
Fig. 1. Schematic representation of fluorescent scanning in the NanoZoomer® S60. The white light passes through an excitation filter, is reflected by a beam splitter, and is directed toward the sample. The fluorescent light emitted by the sample goes through the beam splitter and is filtered through the emission filter. It is then detected by a very sensitive CMOS camera. The NanoZoomer® S60 has two wheels, allowing the installation of six excitation and emission filters. The seventh hole in the emission wheel can be used when a single-band emission filter is installed on a cube. The NanoZoomer® S60 allows you to install three filter cubes.
Using the advanced capabilities of the NanoZoomer® S60, Dr. Schaudien's team explored the effects of low-frequency magnetic fields (ELF-MF) on the immune system in young mice, as part of research into childhood leukemia. The study focused on a mouse model mimicking a common genetic mutation associated with B-cell acute lymphoblastic leukemia (B-ALL), the most common form of childhood leukemia.
The seven-channel setup provided by the NanoZoomer S60 allowed the team to analyze how ELF-MF exposure, both before and after birth, impacted immune cells in tissues such as blood, spleen, bone marrow, and thymus. One example of their findings is a fluorescent image of the spleen captured using the S60 scanner, where six different immune system markers are stained in six distinct colors, with the seventh color representing the nuclear marker DAPI.
Mouse spleen with multiplex staining
Blue – Nuclei, cyan – CD4 positive cells, green – CD3 positive cells, yellow – immunoglobuline M (IgM), orange – CD19, red – CD45R positive cells, dark red – CD8 positive cells.
Merge 40x magnification
Blue – Nuclei, cyan – CD4 positive cells, green – CD3 positive cells, yellow – immunoglobuline M (IgM), orange – CD19, red – CD45R positive cells, dark red – CD8 positive cells.
Fluorophore | Central Wavelength | Ex Filter | Em Filter | Beam splitter | Antigen |
---|---|---|---|---|---|
DAPI | Ex 359 Em 457 |
360/23 |
440/40 | Cube 1 | Nuclei |
Discovery DCC kit (Roche) | Ex 436 Em 480 |
436/22 (Cube 3) | 480/20 | Cube 3 | CD4 |
Discovery FAM kit (Roche) | Ex 490 Em 520 |
485/20 | 525/30 | Cube 1 | CD3 |
Discovery Rhodamine 6G kit (Roche) | Ex 546 Em 572 |
535/26 (Cube 3) |
572/15 | Cube 3 | IgM |
Discovery Red 610 kit (Roche) | Ex 580 Em 625 |
592/8 (Cube 2) |
628/32 (Cube 2) | Cube 2 | CD19 |
Discovery Cy5 kit (Roche) | Ex 650 Em 670 |
650/13 | 684/24 | Cube 1 | CD45R |
Opal Polaris 780 | Ex 768 Em 680 |
740/13 | 809/81 | Cube 1 | CD8 |
Table 1. List of fluorophores used in the study, including the specific excitation and emission filter sets that have been installed in the NanoZoomer® S60. Cube 1: pentaband beam splitter, Cube 2: a single band beam splitter mounted together with an optimal excitation and an emission filter to detect “Red 610”, Cube 3: a dual beamsplitter mounted together with a dual excitation filter.
The collaboration with Hamamatsu Photonics demonstrates the impact of partnerships in digital pathology. This team effort has not only expanded the technological limits of fluorescent imaging but also opened new possibilities for scientific exploration, demonstrating the power of innovation through partnership.
Dr. Dirk Schaudien is a Veterinary Pathologist with a specialization in toxicopathology. He is highly interested in image acquisition and analysis and likes to go beyond existing limitations to achieve better results.
Marta Böhle, PhD, is an Application Engineer at Hamamatsu, specializing in both research and clinical whole slide imaging using NanoZoomer® scanners. With a PhD in Neuroscience and extensive experience in diverse imaging techniques, Marta is passionate about imaging and dedicated to supporting customers in their projects.
Important notice: The NanoZoomer® S60 series includes IVD medical devices and research use only devices. Fluorescence option is available for research use only devices.
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