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Updated: Jul 3, 2026
A Protocol for Explant Cultures of IDH1-mutant Diffuse Low-grade Gliomas
Published on: May 9, 2025
Ischemia-induced changes of intracellular water diffusion in rat glioma cell cultures
Theodore P Trouard1, Kevin D Harkins, Joseph L Divijak
1Biomedical Engineering Program, University of Arizona, Tucson, Arizona 85721-0240, USA. trouard@email.arizona.edu
Abstract:
Diffusion-weighted MRI is commonly used in the diagnosis and evaluation of ischemic stroke because of the rapid decrease observed in the apparent diffusion coefficient (ADC) of tissue water following ischemia. Although this observation has been clinically useful for many years, the biophysical mechanisms underlying the reduction of tissue ADC are still unknown. To help elucidate these mechanisms, we have employed a novel three-dimensional (3D) hollow-fiber bioreactor (HFBR) perfused cell culture system that enables cells to be grown to high density and studied via MRI and MRS. By infusing contrast media into the HFBR, signals from intracellular water and extracellular water are spectroscopically resolved and can be investigated individually. Diffusion measurements carried out on C6 glioma HFBR cell cultures indicate that ischemia-induced cellular swelling results in an increase in the ADC of intracellular water from 0.35 microm(2)/ms to approximately 0.5 microm(2)/ms (diffusion time = 25 ms).
Insights
Ischemic stroke diagnosis using diffusion-weighted MRI relies on changes in apparent diffusion coefficient (ADC). This study used a novel bioreactor to show that cell swelling during ischemia increases intracellular water ADC, offering insights into stroke mechanisms.
Area of Science:
- Biophysics
- Neuroimaging
- Cell Biology
Background:
- Diffusion-weighted MRI is crucial for diagnosing ischemic stroke.
- The underlying biophysical mechanisms of reduced apparent diffusion coefficient (ADC) in stroke are not fully understood.
- Understanding these mechanisms can improve stroke diagnosis and treatment.
Purpose of the Study:
- To investigate the biophysical mechanisms of ADC changes in ischemic stroke.
- To utilize a novel 3D hollow-fiber bioreactor (HFBR) system for studying cell cultures under controlled conditions.
- To spectroscopically resolve and analyze intracellular and extracellular water diffusion.
Main Methods:
- Employed a 3D hollow-fiber bioreactor (HFBR) for high-density cell culture.
- Used MRI and MRS to study cell cultures within the HFBR.
- Infused contrast media to differentiate intracellular and extracellular water signals.
- Performed diffusion measurements on C6 glioma cells under simulated ischemic conditions.
Main Results:
- Demonstrated that ischemia-induced cellular swelling increases the ADC of intracellular water.
- Observed an increase in intracellular water ADC from 0.35 to approximately 0.5 microm(2)/ms (at 25 ms diffusion time).
- Successfully resolved and analyzed intracellular and extracellular water diffusion signals separately.
Conclusions:
- Cellular swelling is a key factor contributing to ADC changes observed in ischemic stroke.
- The HFBR system provides a valuable tool for studying the biophysics of diffusion in dense cell cultures.
- Further research can elucidate the precise mechanisms of ADC changes in stroke, aiding diagnostic accuracy.
