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5-ALA kinetics in meningiomas: analysis of tumor fluorescence and PpIX metabolism in vitro and comparative analyses with high-grade gliomas

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Abstract

Introduction

Although the utility 5-aminolevulinic acid (5-ALA)-mediated fluorescence-guided surgery (FGS) in meningiomas is increasingly discussed, data about the kinetics of protoporphyrin IX (PpIX) and tumor fluorescence are sparse.

Methods

PpIX kinetics after exposition to varying 5-ALA doses (12.5–150 µg/ml) was analyzed in two immortalized as well as primary WHO grade I and II meningioma and U87 high-grade glioma cell lines. Expression of FECH, ABCB6 and ABCG2 was investigated by quantitative real-time PCR.

Results

Fluorescence in Ben-Men 1 and primary WHO grade I/II meningioma increased with rising 5-ALA doses up to 100 µg/ml but then showed a saturation effect. However, decrease of fluorescence was slower after 150 than after 100 µg/ml 5-ALA. Fluorescence in U87 cells marginally increased with rising 5-ALA doses. Kinetics of the fluorescence in Ben-Men 1 cells did not differ from primary meningioma cells after 25–150 µg/ml 5-ALA (p > .05, each). No difference was found when comparing the fluorescence between primary grade I and II meningiomas after any 5-ALA dosage (p > .05, each). No relevant fluorescence was found in IOMM-Lee cells. Expression of FECH, ABCB6 and ABCG2 as well as PpIX export differed between all analyzed cell lines but were not connected to fluorescence.

Conclusions

Eligibility of established meningioma cell lines for in-vitro analyzes of tumor fluorescence significantly differs. Fluorescence in Ben-Men 1 and primary meningioma cell lines but less in IOMM Lee cells is 5-ALA dose-dependent, encouraging in-situ trials to encounter currently discussed shortcomings of FGS in meningiomas. Fluorescence is not related to expression of FECH, ABCB6 and ABCG2.

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Data availability

The datasets generated during and/or analysed during the current study are available from the corresponding author on reasonable request.

Code availability

No custom software code was written for data analysis in this study.

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Acknowledgements

We cordially thank Hans-Joachim Schnittler, Institute of Anatomy and Vascular Biology, University Hospital Muenster, Muenster, Germany, for kindly providing the necessary access to the microplate reader. We further thank Christian Mawrin, Institute of Neuropathology, Magdeburg, Germany, for kindly providing IOMM-Lee Meningioma cell lines.

Funding

Partial financial support was received from the Walter Schulz Stiftung, Germany.

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Authors and Affiliations

Authors

Contributions

All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by ECB, BB and VS. The first draft of the manuscript was written by BB and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

Corresponding author

Correspondence to Benjamin Brokinkel.

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Conflict of interest

The authors have no financial or non-financial interests to disclose.

Ethical approval

All procedures performed in this study involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards. The study was approved by the local ethics committee and permitted by the patients in each single case (2019-296-f-S).

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Informed consent was obtained from all individual participants included in the study.

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Supplementary Information

Below is the link to the electronic supplementary material.

Suppl. Figure 1: Phase contrast microscopy of primary meningioma cells.

Cells could adhere to different coatings including Matrigel (A), PLL plus mLaminin (B) and PLL plus hLaminin (C) as well as to culture plates without any coating and could be kept over several passages. Cells could also be kept in culture for several passages following kryoconservation (D) (div.=days in vitro, h = human, m = mouse, PLL = poly-L-Lysine) (A – C: WHO grade II, atypical meningioma, MIB1 Proliferation-index ND; D: WHO grade I, meningothelial meningioma, MIB1 Proliferation-index 5%). (TIF 17932 kb)

Suppl. Figure 2: Fluorescence intensity in negative controls

. As expected, no relevant fluorescence was detected in negative controls. (TIF 7922 kb)

Suppl. Figure 3: Fluorescence of primary and immortalized meningioma cell lines in comparative analyses.

Fluorescence intensity of Ben-Men 1 cells at 0, 2, 4 and 6 hours was similar as compared to primary meningioma cells after 25–150 µg/ml 5-ALA (p > .05, each). On the other hand, fluorescence intensity between primary WHO grade II meningioma cell lines and IOMM-Lee cells began to differ at 0 and 2 hours after incubation (p = .025 and 0.053) with 25 µg/ml 5-ALA. At 50 µg/ml 5-ALA, fluorescence intensity between both cell lines significantly differed at all time points (p = .036) with a similar trend at doses of 100 and 150 mg/ml 5-ALA (p = .083, each). For better overview exemplary data shown only for 50 µg/ml 5-ALA. (TIF 7523 kb)

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Bunk, E.C., Wagner, A., Stummer, W. et al. 5-ALA kinetics in meningiomas: analysis of tumor fluorescence and PpIX metabolism in vitro and comparative analyses with high-grade gliomas. J Neurooncol 152, 37–46 (2021). https://doi.org/10.1007/s11060-020-03680-9

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