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Cucurbitacin IIb Extracted from Hemsleya penxianensis Induces Cell Cycle Arrest and Apoptosis in Bladder Cancer Cells by Regulating Cell Cycle Checkpoints and Mitochondrial Apoptotic Pathway

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Abstract

Cucurbitacin IIb (CuIIb) extracted from Hemsleya penxianensis has been demonstrated anticancer activity in many malignancies, however, its effect against bladder cancer cells and the molecular mechanism remains unclear. Accordingly, in the present study, we evaluated the effect and further the underlying mechanism of CuIIb on bladder cancer cells. Cell viability and clonogenicity were examined to evaluate growth suppressive effect of CuIIb, alongside mechanism exploration was conducted based on RNA sequencing (RNA-seq). The results showed that CuIIb exposure inhibited the growth of T24 and UM-UC-3 bladder cancer cells as indicated by its obvious suppression on cell viability and clonogenicity. Mechanistic studies by RNA-seq and quantifying analysis of RNA-seq data by TMNP indicated cell cycle modulated by cell cycle checkpoints and apoptosis mediated by PI3K/Akt pathway might account for the anticancer activity of CuIIb. Consistently, results of flow cytometry and AO/EB staining demonstrated that the growth-suppressive effect of CuIIb was mediated by cell cycle arrest in G2/M phase and robust induction of cell apoptosis, which was further confirmed by immunoblotting and mitochondrial membrane potential (ΔΨm) analysis. Collectively, the results presented herein indicated that CuIIb exhibited anticancer activity on bladder cancer which may be a potential candidate for improving bladder cancer outcomes.

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Data Availability

Data will be made available on request.

Abbreviations

CuIIb:

Cucurbitacin IIb

ATM:

Ataxia telangiectasia mutated kinase

NMIBC:

Non-muscle-invasive bladder cancer

NCSs:

Normalized correlation scores

TURBT:

Transurethral resection of the bladder tumor

DEGs:

Differentially Expressed Genes

MIBC:

Muscle-invasive bladder cancer

GO:

Gene Ontology

RNA-Seq:

RNA-sequencing

KEGG:

KEGG Ortholog database

ATR:

Ataxia telangiectasia and Rad3-related kinase

TMNP:

Target prediction module of transcriptome-based multi-scale network pharmacological platform

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Funding

This research was supported by the National Natural Science Foundation of Hebei province (H2022201051), the National Natural Science Foundation of China (No. 82274363), and the CAMS Innovation Fund for Medical Sciences (CIFMS) (No. 2021-I2M-1-071).

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Conceptualization was performed by Xiaowei Huo and Guoxu Ma. Investigation and administration were performed by Nan Chen, Peng Li, Jun Zhang, Zepeng Cao, Ziwen Chen. Data analysis was performed by Nan Chen, Peng Li, Litao Liu and Xudong Xu. Xiaowei Huo and Litao Liu wrote the original draft. Litao Liu and Guoxu Ma reviewed and edited the draft. All authors have read and agreed to the published version of the manuscript.

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Correspondence to Guoxu Ma or Xiaowei Huo.

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Chen, N., Li, P., Liu, L. et al. Cucurbitacin IIb Extracted from Hemsleya penxianensis Induces Cell Cycle Arrest and Apoptosis in Bladder Cancer Cells by Regulating Cell Cycle Checkpoints and Mitochondrial Apoptotic Pathway. Plant Foods Hum Nutr 78, 483–492 (2023). https://doi.org/10.1007/s11130-023-01058-6

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