Abstract
Background The impact of infiltrating macrophages on tumor progression in malignant gliomas has been studied extensively. However, there is a lack of animal models for studying the role of infiltrating macrophages in malignant gliomas. Material and methods: The BT4C rat malignant glioma model was characterized by immunohistochemical analysis of inflammatory cell types associated with the tumors. Results BT4C malignant gliomas are highly vascularized tumors with an infiltrative behavior. BT4C gliomas demonstrated a high infiltration rate of macrophages. Particularly, a CD68/VEGFR-1 positive subtype of macrophages was detected at the edges of malignant gliomas. Also, CD133 positive cells were located mainly at the infiltrative edges of gliomas, whereas VEGFR-2 was highly expressed throughout the malignant glioma. Conclusion The immunocompetent BT4C rat malignant glioma model shows features similar to its human counterpart, which makes it a valuable model to study the impact of tumor associated macrophages in the pathology of malignant gliomas.
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