1
|
Jiang L, Tolani B, Yeh CC, Fan Y, Reza JA, Horvai AE, Xia E, Kratz JR, Jablons DM, Mann MJ. Differential gene expression identifies KRT7 and MUC1 as potential metastasis-specific targets in sarcoma. Cancer Manag Res 2019; 11:8209-8218. [PMID: 31686913 PMCID: PMC6751227 DOI: 10.2147/cmar.s218676] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2019] [Accepted: 08/07/2019] [Indexed: 12/23/2022] Open
Abstract
BACKGROUND Despite numerous discoveries regarding the molecular genesis and progression of primary cancers, the biology of metastasis remains poorly understood. Compared to very large numbers of circulating tumor cells that are now known to accompany nearly all cancers, a relatively limited number of lesions actually develop in most patients with metastases. We hypothesized that phenotypic changes driven by differential gene expression in a finite subpopulation of tumor cells render those cells capable of metastasis and sought to identify key pathways through analysis of gene expression in primary and metastatic lesions from the same patients. METHODS We compared whole-genome expression in 4 matched samples of primary and metastatic sarcoma, then evaluated candidate genes with differential expression via quantitative PCR in 30 additional matched sets, tumor tissue immunostaining, siRNA loss-of-function in a sarcoma cell migration assay, and clinical correlation with overall and disease-free survival after metastasectomy. RESULTS Comparison of microarray signals identified differential expression of cell adhesion genes, including upregulation of KRT7 and MUC1 in metastases; KRT7 and MUC1 upregulation was confirmed in 22 (73%) and 20 (67%) matched sets of metastatic/primary tumors, respectively. Silencing of KRT7 and MUC1 via targeted siRNAs suppressed sarcoma cell migration in vitro, and a significant correlation (two-sided) was observed between both KRT7 and MUC1 expression in metastases and overall patient survival. CONCLUSION KRT7 and MUC1 may play a significant role in enabling sarcoma metastasis, and they may therefore be important prognostic biomarkers as well as potential targets for therapeutic prevention of metastasis.
Collapse
Affiliation(s)
- Long Jiang
- Thoracic Oncology Program, Helen Diller Family Comprehensive Cancer Center, University of California, San Francisco, San Francisco, CA 94115, USA
| | - Bhairavi Tolani
- Thoracic Oncology Program, Helen Diller Family Comprehensive Cancer Center, University of California, San Francisco, San Francisco, CA 94115, USA
| | - Che-Chung Yeh
- Thoracic Oncology Program, Helen Diller Family Comprehensive Cancer Center, University of California, San Francisco, San Francisco, CA 94115, USA
| | - Yanying Fan
- Thoracic Oncology Program, Helen Diller Family Comprehensive Cancer Center, University of California, San Francisco, San Francisco, CA 94115, USA
| | - Joseph A Reza
- Thoracic Oncology Program, Helen Diller Family Comprehensive Cancer Center, University of California, San Francisco, San Francisco, CA 94115, USA
| | - Andrew E Horvai
- Department of Pathology, University of California, San Francisco, San Francisco, CA, USA
| | - Endi Xia
- Thoracic Oncology Program, Helen Diller Family Comprehensive Cancer Center, University of California, San Francisco, San Francisco, CA 94115, USA
| | - Johannes R Kratz
- Thoracic Oncology Program, Helen Diller Family Comprehensive Cancer Center, University of California, San Francisco, San Francisco, CA 94115, USA
| | - David M Jablons
- Thoracic Oncology Program, Helen Diller Family Comprehensive Cancer Center, University of California, San Francisco, San Francisco, CA 94115, USA
| | - Michael J Mann
- Thoracic Oncology Program, Helen Diller Family Comprehensive Cancer Center, University of California, San Francisco, San Francisco, CA 94115, USA
| |
Collapse
|