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Thermococcus kodakarensis-derived L-asparaginase: a candidate for the treatment of glioblastoma

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Abstract

L-Asparaginase is a chemotherapeutic agent against various types of cancer due to its asparagine depleting ability. Previously, we have characterized a highly active and thermostable L-Asparaginase (TK1656) from Thermococcus kodakarensis and reported its anti-cancerous effects against acute lymphoblastic leukemia. In the current study, we report anti-proliferative and cytotoxic effects of TK1656 on glioblastoma cell line SF767. Our results showed that TK1656 reduced the proliferation of glioblastoma cells after 72 h in a dose-dependent manner while leaving Vero cells unaffected. The IC50 of TK1656 against SF767 cells was calculated as 18 µg/mL by neutral red uptake assay. Phase-contrast microscopy showed pronounced morphological changes in TK1656 treated SF767 cells. Likewise, DAPI staining and DNA laddering showed that TK1656 has strong genotoxic effects on glioblastoma cells. The AO/EB dual staining pointed out the induction of apoptosis in TK1656 treated cells. Activation of Caspases 3, 6, and 8, after TK1656 treatment, further substantiated the notion of apoptosis mediated death in these cells. Furthermore, flow cytometry data showed that TK1656 treatment induced cell cycle arrest with an increased sub-G1 cell population and downregulation of CDK2 and CDK4. Altogether, our data revealed that TK1656 induces apoptosis and cell cycle arrest in glioblastoma cells. Our findings prompt further investigations to approve the use of TK1656 for the effective treatment of glioblastoma.

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Abbreviations

GBM:

Glioblastoma multiforme

TK1656:

Thermococcus kodakarensis derived 1656

IC50 :

half maximal inhibitory concentration

ASN:

Asparagine synthetase

FBS:

Fetal bovine serum

AO:

Acridine orange

EB:

Ethidium bromide

CDK2:

Cyclin dependent kinases 2

CDK4:

Cyclin dependent kinases 4

qRTPCR:

Quantitative real-time polymerase chain reaction

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Acknowledgements

We are highly thankful to School of the Biological Sciences, University of the Punjab, Lahore, Pakistan to provide funding and research facilities to conduct this study.

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Contributions

H.N and S.G contributed the experimental work. Q.B. helped in the study design and data analysis. N.S. wrote the manuscript and analyzed the data. N.R. purified the L-asparaginase TK1656 and proofread the manuscript.

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Correspondence to Naveed Shahzad.

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There is no conflict of interest among all the contributing authors.

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Naz, H., Gull, S., Bashir, Q. et al. Thermococcus kodakarensis-derived L-asparaginase: a candidate for the treatment of glioblastoma. Biologia 76, 1305–1314 (2021). https://doi.org/10.2478/s11756-021-00678-0

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  • DOI: https://doi.org/10.2478/s11756-021-00678-0

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