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The role of LncRNA-MANCR induced by HIF-1α drive the malignant progression of pancreatic cancer by targeting miRNA-494/SIRT1 signaling axis under hypoxic conditions

Abstract

This study revealed the prospective biological role and fundamental mechanisms of hypoxia-induced lncRNA-MANCR (MANCR), which is notably upregulated in pancreatic cancer (PC). This work uncovered the potential biological function and underlying mechanisms of hypoxia-induced MANCR, which is significantly elevated in PC. Microarray assays confirmed MANCR expression in the tissues of patients with PC and patients with chronic pancreatitis (CP), which positively correlated with sirtuin-1 (SIRT1) mRNA levels. Chromatin immunoprecipitation and luciferase assays were employed to gauge binding within the hypoxia-inducible factor-1α (HIF-1α)/MANCR/miRNA-494/SIRT1 pathway. Additionally, the association between MANCR expression and the clinical outcomes of patients with PC was confirmed. MANCR is significantly upregulated in PC cells under hypoxic conditions, which is closely linked to poor prognosis in patients with PC. Depletion of MANCR repressed in vitro proliferation, migration, and invasion of PC cells and in vivo growth of PC xenograft tumours. We further demonstrated that MANCR is localised in the cytoplasm and competitively binds miR-494, which directly targets SIRT1. Mechanically, the overexpression of SIRT1 improved the stability of the HIF-1α protein through deacetylation, leading to enhanced HIF-1α assembly. Moreover, MANCR underwent transcriptional regulation by HIF-1α in a hypoxic setting. This modulation was ascribed to HIF-1α binding to hypoxia response elements present in the MANCR promoter sequence. Data revealed the potential possibility of feedback between MANCR and HIF-1α, which may be conducive to hypoxia-induced oncogenicity and PC tumorigenesis, thereby providing a suitable therapeutic target.

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Fig. 1: The lncRNA-MANCR is overexpressed in pancreatic cancer and chronic pancreatitis tissues, which correlates with poor clinical results.
Fig. 2: The lncRNA-MANCR facilitates the invasion and proliferation of pancreatic cancer cells, and is accompanied by increased SIRT1 expression.
Fig. 3: The lncRNA-MANCR regulates SIRT1 expression via competitive binding with miR-494.
Fig. 4: Inhibition of miR-494 reverses the suppressing effect of LV-MANCR-siRNA in PC cells.
Fig. 5: Both downregulated LV-MANCR and overexpressed miR-494 suppress tumour growth and metastasis in vivo.
Fig. 6: Hypoxia induces overexpression of lncRNA-MANCR expression in a HIF-1α-mediated manner.
Fig. 7: The lncRNA-MANCR enhances HIF-1α expression by SIRT1-dependent deacetylation.
Fig. 8: Correlation between MANCR, SIRT1, and HIF-1α expression in PC samples.

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Data availability

Upon reasonable request, the corresponding authors will provide all data that supports the findings of this study.

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Acknowledgements

Not applicable.

Funding

This study was funded by National Natural Science Foundation of China (NO. 82370651, NO. 82070657, NO. 81902515), University Natural Science Research Project of Anhui Province (NO. 2024AH051959 and NO. KJ2019A0412), AnHui Province Educational Natural Science Project (2023AH040254) and Key Science Foundation of Wannan medical college (WK2023ZZD26 and WK2023ZZD25).

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Yan Jin, Hao Hu, and Yitong Tian conceived and coordinated the study, drafted and revised the manuscript. Long Cheng and Xiaoyu Guo performed the cell culture and some cellular experiments. Xiaoxu Huang, Han Xu, and Qiao Yu performed the molecular experiments. Zongwei Wang, Xiaoming Wang and Gang Wang analyzed the data. All authors read and approved the final manuscript.

Corresponding author

Correspondence to Gang Wang.

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The authors declare that they have no competing financial interests or personal relationships that may have influenced the work reported in this study.

Ethics approval and consent to participate

The present study was conducted in accordance with the relevant guidelines and regulations that govern the ethical conduct of research in this field. The human patient consent forms and protocols for this study were approved by the Wannan Medical College Ethics Committee (No: Wannan Medical College IRB2020011), and written informed consent was obtained from all participants prior to their inclusion in the study. The ethical policies and procedures for animal experiments were approved by the Animal Ethics Committee of the Academic Medical Centre at Wannan Medical College (Wuhu, China) (No: LLSC-2020-081). All animal care and experimental procedures adhered to the guidelines outlined in the Guide for the Care and Use of Laboratory Animals (2011). It is also noteworthy that no identifiable images or other personal data of participants were used in this study.

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Jin, Y., Hu, H., Tian, Y. et al. The role of LncRNA-MANCR induced by HIF-1α drive the malignant progression of pancreatic cancer by targeting miRNA-494/SIRT1 signaling axis under hypoxic conditions. Cancer Gene Ther 32, 633–648 (2025). https://doi.org/10.1038/s41417-025-00900-0

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