Abstract
Background
Angiogenesis is a critical biological process essential for solid cancer growth and metastasis. It has been shown that microRNAs (miRNAs) play a vital role in a variety of biological processes in cancers. However, whether miR-130b is involved in prostate cancer angiogenesis remains ill-defined.
Methods
We performed the miRNA microarray to analyze miRNA expression in human prostate cancer specimens. In vitro gain-of-function assays and loss-of-function assays were conducted to explore the potential functions of miR-130b in human prostate cancer cells. Correlation analysis and dual-luciferase reporter assay were performed to validate whether tumor necrosis factor-α (TNF-α) was a direct target of miR-130b. The Matrigel plug and tumor vascular imaging assays were performed to confirm the anti-angiogenic activity of miR-130b in nude mice.
Results
We found that miR-130b was one of the miRNAs being most significantly downregulated. Subsequently, we found that miR-130b expression was markedly downregulated in human prostate cancer cell lines. Down-regulation of miR-130b in prostate cancer cells significantly promoted the proliferation, invasion and tubule formation of human umbilical vein endothelial cells (HUVECs), while ectopic expression of miR-130b blocked prostate cancer angiogenesis in vitro and in vivo. Mechanistic analyses indicated that tumor necrosis factor-α (TNF-α) was regulated by miR-130b directly. MiR-130b attenuated nuclear factor-κB (NF-κB) signaling and its downstream gene vascular endothelial growth factor-A (VEGFA) by directly inhibiting TNF-α expression. Additionally, subsequent investigations identified that the ectopic level of VEGFA markedly abrogated the anti-angiogenic effect induced by miR-130b. Interestingly, VEGFA could in turn decrease the expression of miR-130b, thus forming a negative feedback loop that drives the angiogenesis of prostate cancer.
Conclusion
These findings show that miR-130b/TNF-α/NF-κB/VEGFA feedback loop is significantly correlated with angiogenesis in prostate cancer and miR-130b could be regarded as potential therapeutic target for prostate cancer anti-angiogenesis treatment.
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Abbreviations
- miRNAs:
-
MicroRNAs
- TNF-α:
-
Tumor necrosis factor-α
- NF-κB:
-
Nuclear factor-κB
- HUVECs:
-
Human umbilical vein endothelial cells
- UTRs:
-
Untranslated regions
- CM:
-
Conditioned medium
- CCK-8:
-
Cell counting kit-8
- RT-PCR:
-
Reverse transcription polymerase chain reaction
- wt:
-
Wild type
- mut:
-
Mutant
- EMSA:
-
Electrophoretic mobility shift assay
- VCAM-1:
-
Vascular cell adhesion molecule-1
- ICAM-1:
-
Intracellular adhesion molecule-1
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Acknowledgements
We are grateful to Dr An Liu (Yueyang, China) for his generous support.
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This study was approved by the medical ethics committee of The Second Affiliated Hospital & Yuying Children’s Hospital of Wenzhou Medical University, and all the participants signed written informed consent forms.
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Mu, H.Q., He, Y.H., Wang, S.B. et al. MiR-130b/TNF-α/NF-κB/VEGFA loop inhibits prostate cancer angiogenesis. Clin Transl Oncol 22, 111–121 (2020). https://doi.org/10.1007/s12094-019-02217-5
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DOI: https://doi.org/10.1007/s12094-019-02217-5