A Histopathologic Correlation Study Evaluating Glymphatic Function in Brain Tumors by Multiparametric MRI

Min Gao ¹, Zhengliang Liu ², Hongjing Zang ³

⁰Department of Radiology, The Second Xiangya Hospital of Central South University, Changsha, China.

Clinical Cancer Research : an Official Journal of the American Association for Cancer Research +

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June 7, 2024

View abstract on PubMed

Summary

Brain tumors impair glymphatic function and increase fluid buildup, as shown by reduced DTI-ALPS index in patients. Aquaporin-4 (AQP4) levels correlate with edema, impacting brain fluid dynamics.

Area Of Science

Neuroimaging
Neurosurgery
Oncology

Background

Brain tumors significantly affect brain function and physiology.
Cerebral edema and impaired glymphatic drainage are common complications.
Understanding the relationship between tumor characteristics, glymphatic function, and edema is crucial.

Purpose Of The Study

To investigate the impact of brain tumors on cerebral edema and glymphatic drainage.
To explore correlations between tumor characteristics, glymphatic function (assessed by DTI-ALPS), and aquaporin-4 (AQP4) expression.
To leverage advanced MRI techniques for quantitative brain mapping.

Main Methods

Prospective cohort study including patients with glioblastoma, brain metastases, aggressive meningiomas, and healthy controls.
Utilized 3.0T MRI, including diffusion tensor imaging analysis along the perivascular space (DTI-ALPS) and multiparametric MRI.
Analyzed tumor and peritumor tissues for AQP4 expression via immunofluorescence.

Main Results

Patients with brain tumors showed significantly reduced glymphatic function (lower DTI-ALPS index) and increased cerebrospinal fluid volume compared to controls.
A negative correlation was found between tumor volume and the DTI-ALPS index.
AQP4 expression levels positively correlated with peritumoral brain edema volume.

Conclusions

Brain tumors disrupt glymphatic function and alter fluid dynamics, contributing to cerebral edema.
DTI-ALPS and multiparametric MRI are valuable tools for assessing tumor-related pathophysiology.
Findings provide a radiological basis for further neuro-oncological research on the glymphatic system.