Open AccessStromal immunoglobulin κC expression is associated with initiation of breast cancer in TA 2 mice and human breast cancer
Author(s) -
Zhang Shiwu,
Fei Fei,
Wang Hua,
Gu Yanjun,
Li Chunyuan,
Wang Xinlu,
Zhao Yongjie,
Li Yuwei
Publication year - 2018
Publication title -
cancer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.035
H-Index - 141
eISSN - 1349-7006
pISSN - 1347-9032
DOI - 10.1111/cas.13620
Subject(s) - breast cancer , stromal cell , pathology , lymph node , ductal carcinoma , in situ hybridization , cancer , breast carcinoma , cancer research , biology , medicine , gene expression , gene , biochemistry
The initiation of spontaneous breast cancer ( SBC ) in Tientsin Albino 2 ( TA 2) mice is related to mouse mammary tumor virus ( MMTV ) infection, and MMTV amplification is hormonally regulated. To explore the insertion site of MMTVLTR in TA 2 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 TA 2 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 Ig κ v2‐112 and Ig κ v14‐111 in chromosome 6 of TA 2 mouse. IG κ C was localized in the stromal cells of TA 2 mouse with SBC and in human breast cancer tissues. Tumor cells were negative for IG κ C in RNA in situ hybridization. The positive staining index of IG κ C 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 IG κ C was related to the expression of ER , PR , HER 2 and Ki‐67. Our findings showed that stromal IG κ C expression was associated with the initiation of SBC in TA 2 mice. IG κ C may be a high‐risk factor for the initiation and progression of human breast cancer.