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Overexpression of KIT in chromophobe renal cell carcinoma
Ken Yamazaki1, Michiie Sakamoto, Tsutomu Ohta
1Cancer Genomics Division, National Cancer Center Research Institute, Tokyo, Japan.
Abstract:
We analysed gene-expression profiles in 15 surgical specimens of conventional, papillary, and chromophobe renal cell carcinomas (RCCs) using high-density oligonucleotide arrays. From about 12,000 genes targeted by the array, 67 were upregulated specifically in each histological type of RCC. The oncogene KIT was one of the genes whose expression was upregulated specifically in chromophobe RCCs. Immunohistochemical analysis demonstrated the KIT gene product on the cell membrane of chromophobe RCC in all cases, although it was not detected in conventional RCCs or non-neoplastic kidneys except for weak staining in the cytoplasm of renal tubules. These results suggest that each histological subtype of RCC has a unique gene-expression profile, and in particular indicates for the first time that KIT could be a useful marker for chromophobe RCC. As overexpression of KIT might be involved in tumor growth, KIT could be a new therapeutic target in this special type of RCC.
Insights
This study identified unique gene expression profiles for different renal cell carcinoma (RCC) subtypes. The KIT oncogene was specifically upregulated in chromophobe RCC, suggesting it as a potential diagnostic marker and therapeutic target.
Area of Science:
- Oncology
- Molecular Biology
- Genetics
Background:
- Renal cell carcinoma (RCC) is a heterogeneous disease with distinct histological subtypes.
- Understanding subtype-specific molecular alterations is crucial for diagnosis and treatment.
- Gene expression profiling offers a comprehensive approach to identify such alterations.
Purpose of the Study:
- To identify unique gene-expression profiles for conventional, papillary, and chromophobe subtypes of renal cell carcinoma (RCC).
- To investigate the potential of specific genes as diagnostic markers for RCC subtypes.
- To explore novel therapeutic targets for specific RCC types.
Main Methods:
- Analysis of gene-expression profiles from 15 surgical specimens of RCC using high-density oligonucleotide arrays.
- Identification of genes specifically upregulated in each RCC histological subtype.
- Immunohistochemical validation of KIT gene product expression in RCC tissues.
Main Results:
- Out of approximately 12,000 genes analyzed, 67 were specifically upregulated in each RCC histological type.
- The oncogene KIT was found to be specifically upregulated in chromophobe RCC.
- KIT gene product was detected on the cell membrane of chromophobe RCC in all cases, with minimal expression in other RCC types and normal kidney tissue.
Conclusions:
- Each histological subtype of RCC exhibits a unique gene-expression profile.
- KIT represents a potential diagnostic marker for chromophobe RCC.
- KIT overexpression may contribute to tumor growth, positioning KIT as a potential therapeutic target for chromophobe RCC.