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Updated: Jul 28, 2026
Experimental Metastasis Assay
Published on: August 24, 2010
VPS35/Retromer-dependent MT1-MMP regulation confers melanoma metastasis
Qinggang Hao1,2, Yan Bai1, Ruiqi Guan1
1Yunnan Key Laboratory of Cell Metabolism and Diseases, State Key Laboratory for Conservation and Utilization of Bio-Resources in Yunnan, Center for Life Sciences, School of Life Sciences, Yunnan University, Kunming, 650504, China.
Abstract:
Retromer is a conserved endosomal trafficking complex responsible for recycling transmembrane protein cargoes. Membrane-type I matrix metalloproteinase (MT1-MMP), a well-studied membrane-type metalloprotease, is highly expressed in metastatic melanomas. Previously, we reported that inducing MT1-MMP perinuclear localization and inhibiting MT1-MMP membrane localization significantly reduce melanoma metastasis. However, the regulation of MT1-MMP subcellular localization and recycling is still largely unknown. Here, we performed target gene shRNA screening and found that shRNA targeting the Retromer complex subunit vacuolar protein sorting 35 (VPS35) inhibited MT1-MMP membrane localization and induced its perinuclear localization. We found that inhibiting VPS35/Retromer decreased MT1-MMP recycling and increased MT1-MMP-lysosome localization, which significantly affected the stability of MT1-MMP. Furthermore, our results indicated that VPS35/Retromer regulates the transcription of MT1-MMP by activating interleukin-6 (IL-6)/signal transducer and activator of transcription 3 (STAT3) inflammatory signaling pathway. Tissue microarray analysis indicated that VPS35/Retromer positively correlated with MT1-MMP levels and distant metastasis. Xenograft experiments showed that targeting VPS35/Retromer significantly inhibited melanoma lung metastasis, which is dependent on MT1-MMP. Our results implicate the importance of VPS35/Retromer in metastatic dissemination. Our study suggests that targeting the VPS35/Retromer-MT1-MMP axis will contribute to inhibiting the metastasis of melanoma.
Insights
The Retromer complex, specifically vacuolar protein sorting 35 (VPS35), controls the recycling of membrane-type I matrix metalloproteinase (MT1-MMP) in melanoma. Targeting VPS35/Retromer inhibits melanoma metastasis by affecting MT1-MMP localization and stability.
Area of Science:
- Cell Biology
- Cancer Research
- Molecular Biology
Background:
- Retromer is crucial for endosomal trafficking and recycling of transmembrane proteins.
- Membrane-type I matrix metalloproteinase (MT1-MMP) is implicated in melanoma metastasis.
- Regulation of MT1-MMP localization and recycling in melanoma is not well understood.
Purpose of the Study:
- To investigate the role of the Retromer complex in regulating MT1-MMP subcellular localization and melanoma metastasis.
- To identify the molecular mechanisms by which Retromer influences MT1-MMP trafficking and stability.
- To evaluate the therapeutic potential of targeting the VPS35/Retromer-MT1-MMP axis in melanoma.
Main Methods:
- Target gene shRNA screening to identify Retromer complex involvement.
- Analysis of MT1-MMP localization, recycling, and lysosomal degradation.
- Investigation of the interleukin-6 (IL-6)/signal transducer and activator of transcription 3 (STAT3) signaling pathway.
- Tissue microarray analysis and xenograft experiments in mice.
Main Results:
- shRNA targeting vacuolar protein sorting 35 (VPS35), a Retromer subunit, inhibited MT1-MMP membrane localization and promoted perinuclear localization.
- VPS35/Retromer inhibition decreased MT1-MMP recycling, increased lysosomal localization, and affected MT1-MMP stability.
- VPS35/Retromer was found to regulate MT1-MMP transcription via the IL-6/STAT3 pathway.
- VPS35/Retromer levels positively correlated with MT1-MMP expression and distant metastasis in patient tissues.
- Targeting VPS35/Retromer significantly inhibited MT1-MMP-dependent melanoma lung metastasis in xenograft models.
Conclusions:
- VPS35/Retromer plays a critical role in regulating MT1-MMP trafficking, stability, and transcriptional regulation in melanoma.
- The VPS35/Retromer-MT1-MMP axis is a key driver of melanoma metastatic dissemination.
- Targeting the VPS35/Retromer-MT1-MMP pathway represents a promising therapeutic strategy for inhibiting melanoma metastasis.
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