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Involvement of Extracellular Vesicle Long Noncoding RNA (linc-VLDLR) in Tumor Cell Responses to Chemotherapy
Abstract
Hepatocellular cancer (HCC) is a highly treatment-refractory cancer and is also highly resistant to adverse cellular stress. Although cell behavior can be modulated by noncoding RNAs (ncRNA) within extracellular vesicles (EV), the contributions of long noncoding RNAs (lncRNAs) are largely unknown. To this end, the involvement and functional roles of lncRNAs contained within EVs during chemotherapeutic stress in human HCC were determined. Expression profiling identified a subset of lncRNAs that were enriched in tumor cell–derived vesicles released from two different cell lines. Of these, lincRNA-VLDLR (linc-VLDLR) was significantly upregulated in malignant hepatocytes. Exposure of HCC cells to diverse anticancer agents such as sorafenib, camptothecin, and doxorubicin increased linc-VLDLR expression in cells as well as within EVs released from these cells. Incubation with EVs reduced chemotherapy-induced cell death and also increased linc-VLDLR expression in recipient cells. RNAi-mediated knockdown of linc-VLDLR decreased cell viability and abrogated cell-cycle progression. Moreover, knockdown of VLDLR reduced expression of ABCG2 (ATP-binding cassette, subfamily G member 2), whereas overexpression of this protein reduced the effects of VLDLR knockdown on sorafenib-induced cell death. Here, linc-VLDLR is identified as an EV-enriched lncRNA that contributes to cellular stress responses. Implications: These findings provide new insight into the role of EVs and demonstrate the capacity of lncRNAs to mediate chemotherapeutic stress response in HCC. Mol Cancer Res; 12(10); 1377–87. ©2014 AACR.
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“Upon sorafenib treatment, exosomal linc-VLDLR levels in HCC cells increase. This linc-VLDLR is subsequently transferred to neighboring cells through exosomes. After being absorbed by target cells, linc-VLDLR causes drug resistance by increasing ATP-binding cassette sub-family G member 2 (ABC-G2) [116].”
From Emerging role of exosomes in cancer therapy: progress and challenges (2025) · cites this paper as [116]
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Emerging role of exosomes in cancer therapy: progress and challenges
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Extracellular Vesicles in Liver Pathobiology: Small Particles With Big Impact
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Metadata
- Authors
- Takahashi, K., Yan, I. K., Wood, J., Haga, H., & Patel, T.
- Venue
- Molecular Cancer Research
- Published
- 2014-10-01
- Volume
- 12
- Issue
- 10
- Pages
- 1377-1387
- ISSN
- 1541-7786
- 1557-3125
- PMC
- PMC4201956
- Cited by
- 258
- References
- 6
- Language
- en
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