• Department of Pathology, Danzhou People’s Hospital, Danzhou, Hainan 571700, P. R. China;
FENG Hailing, Email: fengyanz18@163.com
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Objective To investigate the regulatory mechanism of thioredoxin binding protein (TXNIP)/nucleotide-binding oligomerization domain-like receptor protein 3 (NLRP3) pathway in the occurrence and development of breast cancer.Methods The resected 15 cases of breast cancer tissues and their adjacent tissues in our hospital from September 2019 to June 2020 were selected, and the immunohistochemistry was used to detect the expression levels of TXNIP and NLRP3 in breast cancer and its adjacent tissues. Three breast cancer cell lines (MDA-MB231, MCF-7 and SKBR3) and normal breast epithelial cell line (HMEC) were collected. Western blot was used to detect the relative expression levels of TXNIP and NLRP3 in three breast cancer cell lines and HMEC cell line. MDA-MB231 cancer cells were divided into blank control group (normal culture without any treatment), TXNIP overexpression group (Ad-TXNIP group, transfected with adenovirus vector carrying TXNIP overexpression sequence), Ad-TXNIP negative control group (Ad-eGFP1 group, transfected of empty adenovirus vector without TXNIP overexpression sequence), NLRP3 overexpression group (Ad-NLRP3 group, transfected with adenovirus vector containing NLRP3 overexpression sequence), TXNIP and NLRP3 overexpression co-transfection group (Ad-TXNIP+Ad-NLRP3 group, co-transfection of adenovirus vector carrying TXNIP and NLRP3 overexpression sequence), TXNIP overexpression and Ad-NLRP3 negative control (Ad-eGFP2) co-transfection group (Ad-TXNIP+ Ad-eGFP2 group, co-transfection of empty adenovirus vector carrying TXNIP overexpression sequence and NLRP3 overexpression sequence). After 24 hours of transfection and culture, CCK-8 method was used to detect the MDA-MB231 cells proliferation. Transwell chamber method was used to detect MDA-MB231 cells migration and invasion. Nude mice tumorigenicity test was used to detect the tumorigenicity of the MDA-MB231 cells in vivo. Western blot was used to detect the expressions of TXNIP, NLRP3, proliferation marker protein (Ki-67), caspase-1, vascular endothelial growth factor (VEGF), interleukin (IL)-1β, IL-18 and caspase-1 precursor protein (pro-caspase-1) in the MDA-MB231 cells.Results Compared with the adjacent tissues, the relative expression level of TXNIP protein decreased (P<0.05) and the relative expression level of NLRP3 protein increased (P<0.05) in breast cancer tissues. Compared with normal breast epithelial cell line (HMEC cell line), the relative expression levels of TXNIP protein in MDA-MB231, MCF-7 and SKBR3 breast cancer cell lines were decreased (P<0.05), and the relative expression levels of NLRP3 protein were increased (P<0.05). Compared with the blank control group, the relative expression levels of TXNIP, NLRP3, IL-1β, IL-18, pro-caspase-1 and caspase-1 protein were increased (P<0.05), the relative expression levels of Ki-67 and VEGF protein, the proliferation activity, invasion and migration ability and tumor weight of MDA-MB231 cells were decreased (P<0.05) in the Ad-TXNIP group and the Ad-NLRP3 group. Compared with the Ad-TXNIP group and the Ad-NLRP3 group, the relative expression levels of TXNIP, NLRP3, IL-1β, IL-18, pro-caspase-1 and caspase-1 protein were further increased (P<0.05), the relative expression levels of Ki-67 and VEGF protein, the proliferation activity, invasion and migration ability of MDA-MB231 cells and tumor weight were further decreased (P<0.05) in the Ad-TXNIP+Ad-NLRP3 group.Conclusions In breast cancer tissues and breast cancer cell lines, TXNIP is low expression and NLRP3 is high expression. They can interact with each other to promote pyroptosis and inhibit the proliferation, invasion and migration of breast cancer cells.