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Zhang S, Fei F, Wang H, Gu Y, Li C, Wang X, Zhao Y, Li Y. Stromal immunoglobulin κC expression is associated with initiation of breast cancer in TA2 mice and human breast cancer. Cancer Sci 2018; 109:1825-1833. [PMID: 29683229 PMCID: PMC5989835 DOI: 10.1111/cas.13620] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2018] [Revised: 04/07/2018] [Accepted: 04/12/2018] [Indexed: 12/11/2022] Open
Abstract
The initiation of spontaneous breast cancer (SBC) in Tientsin Albino 2 (TA2) mice is related to mouse mammary tumor virus (MMTV) infection, and MMTV amplification is hormonally regulated. To explore the insertion site of MMTVLTR in TA2 mouse genome, reverse PCR and nested PCR were used to amplify the unknown sequence on both sides of the MMTV‐LTRSAG gene in SBC and normal breast tissue of TA2 mice. Furthermore, the clinicopathological significance of the insertion site was evaluated in 43 samples of normal breast tissue, 46 samples of breast cystic hyperplasia, 54 samples of ductal carcinoma in situ, 142 samples of primary breast cancer and 47 samples of lymph node metastatic breast cancer by RNA in situ hybridization. We confirmed that the insertion site of the MMTV‐LTRSAG gene was located between Igκv2‐112 and Igκv14‐111 in chromosome 6 of TA2 mouse. IGκC was localized in the stromal cells of TA2 mouse with SBC and in human breast cancer tissues. Tumor cells were negative for IGκC in RNA in situ hybridization. The positive staining index of IGκC in stromal cells was the highest in lymph node metastatic breast cancer, followed by primary breast cancer, ductal carcinoma in situ, and breast cystic hyperplasia. Furthermore, the positive staining index of IGκC was related to the expression of ER, PR, HER2 and Ki‐67. Our findings showed that stromal IGκC expression was associated with the initiation of SBC in TA2 mice. IGκC may be a high‐risk factor for the initiation and progression of human breast cancer.
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Affiliation(s)
- Shiwu Zhang
- Department of Pathology, Tianjin Union Medical Center, Tianjin, China
| | - Fei Fei
- Department of Pathology, Tianjin Union Medical Center, Tianjin, China.,Nankai University School of Medicine, Nankai University, Tianjin, China
| | - Hua Wang
- Department of Pathology, Tianjin Union Medical Center, Tianjin, China
| | - Yanjun Gu
- Department of Pathology, Affiliated Hospital of Logistic University of People's Armed Police Force, Tianjin, China
| | - Chunyuan Li
- Department of Pathology, Tianjin Union Medical Center, Tianjin, China.,Nankai University School of Medicine, Nankai University, Tianjin, China
| | - Xinlu Wang
- Department of Pathology, Tianjin Union Medical Center, Tianjin, China.,Graduate School, Tianjin University of Traditional Chinese Medicine, Tianjin, China
| | - Yongjie Zhao
- Department of General Surgery, Tianjin Union Medical Center, Tianjin, China
| | - Yuwei Li
- Departments of Colorectal Surgery, Tianjin Union Medical Center, Tianjin, China
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