Low expression of CRISP3 predicts a favorable prognosis in patients with mammary carcinoma

Abstract The discovery of cysteine‐rich secretory protein 3 (CRISP3) has been made in human neutrophils for the first time. Cloning of the complementary DNA (cDNA) for CRISP3 was performed from a cDNA library of human bone marrow. In patients with mammary carcinoma, we found that lower expression of CRISP3 was connected to a significantly improved DFS (disease‐free survival) and OS (overall survival). Furthermore, the CRISP3 protein level was significantly associated with negative ANXA1 protein level. In addition, the heterogeneous expression of CRISP3 had been exhibited in diverse mammary carcinoma cells. A significant higher mRNA and the protein level of CRISP3 were seen in T‐47D as well as SK‐BR‐3 cells compared with those in other types of mammary carcinoma cells. Knockdown of CRISP3 in T‐47D or SK‐BR‐3 cells resulted in the weakened migration or invasion abilities. Furthermore, CRISP3 knockdown significantly inhibited the ERK1/2 MAPK signaling pathway in T‐47D or SK‐BR‐3 cells. Research results indicated that the lowering in the expression of CRISP3 is likely to serve as an unprecedented approach for the treatment of mammary carcinoma.