Abstract
The brain is an important site of hematogenous metastases from malignanttumors in other organs. The effects on the brain is a combination of tissuedestruction induced by invading tumor cells and reactive alterationsoccurring around the metastases. This review focuses on neuropathologicalchanges around hematogenous metastases of the human brain. The peritumoralbrain parenchyma shows structural and functional changes of theintracerebral microvessels and edema. The endothelial cells of peritumoralmicrovessels express glucose transporter protein (GLUT 1) in the same way asthe normal brain. Reduction in immunostaining to GLUT 1 may occur in themicrovessels located within the metastases. This would indicateabnormalities of the blood-brain barrier in tumor vessels but normal barrierfunction in the peritumoral region. Reactive astrocytes and activatedmicroglial cells are both involved in the process of peritumoral gliosis.Activated glial cells produce numerous biological active compounds includingendothelin-1 which after release from such cells can influence the structureand function of the peritumoral brain tissue. Lesions of oligodendrocytesand edema may be implicated in myelin degeneration. Finally, metastases willinduce axonal and neuronal injuries as indicated by a recent study onexpression of β-amyloid precursor protein (βAPP) in reactive axonalswellings.
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Zhang, M., Olsson, Y. Hematogenous metastases of the human brain – Characteristics of peritumoral brain changes: A review. J Neurooncol 35, 81–89 (1997). https://doi.org/10.1023/A:1005799805335
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DOI: https://doi.org/10.1023/A:1005799805335