Dataset Information

Proteomics of tumor associated microglia, tumor tissue from SB28 glioblastoma mice, and control microglia

ABSTRACT: The 18 kDa translocator protein (TSPO) emerges as an important PET biomarker to assess the tumor microenvironment (TME) in glioblastoma. However, various cellular sources hamper interpretation and biological understanding of TSPO and other immune biomarkers in the TME. Thus, we established a novel method, combining immunomagnetic cell sorting after radiotracer injection (scRadiotracing) with 3D histology via light sheet microscopy and proteomics to dissect cellular allocation of TSPO enrichment in glioblastoma. Single tumor cells of implanted SB28 glioblastoma mice indicated 1.37-fold higher TSPO tracer uptake and 1.46-fold higher TSPO protein expression levels when compared to tumor associated microglia/macrophages (TAMs). Using proteomics, we compared the proteome of tumor associated microglia/macrophages (TAMs), Tumor tissue (TT) and control microglia from WT mice without glioblastoma. This analysis identified TAM specific targets for PET radioligand development with additional potential to monitor diverse TAM subpopulations in vivo. In summary, our data indicate that tumor cells need to be acknowledged as the main contributor to TSPO as a biomarker in glioblastoma. Combining cellular tracer uptake measures with 3D histology facilitates precise allocation of complex PET signal sources and will serve to validate novel TAM specific radioligands.

INSTRUMENT(S): timsTOF Pro

ORGANISM(S): Mus Musculus (mouse)

TISSUE(S): Brain, Microglial Cell

DISEASE(S): Glioblastoma

SUBMITTER: Stephan Mueller

LAB HEAD: Stefan F. Lichtenthaler

PROVIDER: PXD044033 | Pride | 2023-10-30

REPOSITORIES: Pride

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Publications

Deciphering sources of PET signals in the tumor microenvironment of glioblastoma at cellular resolution.

Bartos Laura M LM Kirchleitner Sabrina V SV Kolabas Zeynep Ilgin ZI Quach Stefanie S Beck Alexander A Lorenz Julia J Blobner Jens J Mueller Stephan A SA Ulukaya Selin S Hoeher Luciano L Horvath Izabela I Wind-Mark Karin K Holzgreve Adrien A Ruf Viktoria C VC Gold Lukas L Kunze Lea H LH Kunte Sebastian T ST Beumers Philipp P Park Ha Eun HE Antons Melissa M Zatcepin Artem A Briel Nils N Hoermann Leonie L Schaefer Rebecca R Messerer Denise D Bartenstein Peter P Riemenschneider Markus J MJ Lindner Simon S Ziegler Sibylle S Herms Jochen J Lichtenthaler Stefan F SF Ertürk Ali A Tonn Joerg C JC von Baumgarten Louisa L Albert Nathalie L NL Brendel Matthias M

Science advances 20231027 43

Various cellular sources hamper interpretation of positron emission tomography (PET) biomarkers in the tumor microenvironment (TME). We developed an approach of immunomagnetic cell sorting after in vivo radiotracer injection (scRadiotracing) with three-dimensional (3D) histology to dissect the cellular allocation of PET signals in the TME. In mice with implanted glioblastoma, translocator protein (TSPO) radiotracer uptake per tumor cell was higher compared to tumor-associated microglia/macrophag ...[more]

PMID: 37889970

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Project description:High-grade gliomas, the most common and aggressive primary brain tumors, are characterized by a complex and multifaceted tumor microenvironment (TME). Among the non-malignant cells of the glioma TME, tumor-associated microglia and macrophages (TAMs) constitute the major compartment. In patients, a greater abundance of TAMs is associated with high-grade and more aggressive disease. In a range of glioma mouse models, we have observed specific alterations in TAM dynamics and functions during tumor development and following different therapeutic interventions, including irradiation. The underlying TAM abundance may also modulate the subsequent response to TAM-targeted therapy, including the anti-CSF1R inhibitor BLZ945, which results in a pronounced tumor regression in different preclinical models of brain cancers, as our lab has recently shown. These observations indicate that it is crucial to evaluate TAM abundance and dynamics in gliomas. Current techniques to quantify TAMs in patients rely mainly on histological staining of tumor biopsies. While informative, these techniques require an invasive procedure to harvest the tissue sample and typically only result in a snapshot of a small region at a single point in time. Fluorine isotope 19 MRI (19F MRI) has been shown to be a powerful tool to non-invasively and longitudinally monitor myeloid cells in other pathological conditions by injecting perfluorocarbon-containing nanoparticles (PFC-NP). In this study, we demonstrated the feasibility and power of 19F MRI in preclinical glioma models and brain metastasis models and showed that the major cellular source of 19F signal consists of TAMs. Moreover, PFC-NP accumulation occurred predominantly in proximity to dysmorphic vessels, thereby enabling the identification of a TAM subpopulation with a specific oxidative metabolism. We also evaluated this imaging modality in the context of irradiation (IR) treatment and found that the 19F signal enables the tracking of TAM dynamics over time following IR. Moreover, multispectral 19F MRI with two different PFC-NP allowed us to identify spatially- and temporally-distinct TAM niches in IR-recurrent tumors. Together, we have been able to image TAMs non-invasively and longitudinally with a powerful integrated cellular, spatial and temporal resolution, while revealing new biological insights into the many functions of TAMs, including in disease recurrence.

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