MAP7 Promotes Breast Cancer Cell Migration and Invasion by Regulating the NF-?B Pathway

Objective. To investigate and explore the molecular mechanisms of MAP7 on breast cancer cell migration and invasion. Methods. The MAP7 transcript data in TCGA database was firstly statistically analyzed. Then, immunohistochemistry and western blot assays were applied to check MAP7 expression levels in breast cancer tissues or cell lines. EdU immunofluorescent staining assay was applied to reveal the cell proliferation of breast cancer cells after knockdown or overexpression of MAP7. Scratch and Transwell assays were applied to observe cell invasion and migration after knockdown or overexpression of MAP7. The western blot assays were employed to prove the expression levels of NF-kappa B p65 and IKB alpha after knockdown or overexpression of MAP7. Finally, breast xenograft model was established to verify the tumor volume and weight in mice. Results. The results indicated the mRNA and protein expression of MAP7 was higher in breast cancer tissues or cell lines than that in normal tissue or normal breast epithelial cells, respectively. MAP7 promoted proliferation, migration, and invasion of breast cancer cells. Knockdown or overexpression of MAP7 in breast cancer cells would inhibit or promote phosphorylation of NF-kappa B p65 and IKB alpha protein. Finally, MAP7 can also promote tumor growth in mice. Conclusion. MAP7 facilitated breast cancer cell migration and invasion by regulating the NF-kappa B pathway.