Distinct expression profiles and functions of Kindlins in breast cancer

Journal of Experimental & Clinical Cancer Research

Laetitia Fuhrmann¹  Anne Vincent-Salomon¹  Aurélie Ponceau²  Florian Bonin²  Sophie Vacher²  Rosette Lidereau²  Paula Azorin²  Ahmad Moukachar²  Ivan Bièche²  Keltouma Driouch²  Elisabetta Marangoni³ 

[1] Pathology Department, Institut Curie;Pharmacogenomics Unit, Genetics Department, Institut Curie;Translational Research Department, Institut Curie, PSL Research University;

关键词: Kindlins;    Redundant functions;    Invasion;    Breast cancer;    Prognosis;   

DOI  :  10.1186/s13046-018-0955-4

来源: DOAJ

【 摘 要 】

Abstract Background Kindlin-1, − 2, and − 3 are the three members of the Kindlin family. They are best known as regulators of integrin functions, contributing to fundamental biological processes such as cell survival, adhesion and migration. Their deregulation leads to diverse pathologies including a broad range of cancers in which both, tumor-promoting and tumor-inhibiting functions have been described. Methods To better characterize Kindlins implication in breast cancer, in vitro experiments were performed in a series of cancer cell lines. We first assessed their expression profiles and subcellular distributions. Then, their involvement in breast cancer cell morphology, migration and invasion was verified by examining phenotypic changes induced by the depletion of either isoforms using RNA interference. An expression study was performed in a series of breast cancer patient derived xenografts (n = 58) to define the epithelial and stromal contribution of each Kindlin. Finally, we analyzed the expression levels of the three Kindlins in a large series of human breast tumors, at the RNA (n = 438) and protein (n = 129) levels and we evaluated their correlation with the clinical outcome. Results We determined that Kindlin-1 and Kindlin-2, but not Kindlin-3, were expressed in breast tumor cells. We uncovered the compensatory roles of Kindlin-1 and -2 in focal adhesion dynamics and cell motility. Remarkably, Kindlin-2 had a predominant effect on cell spreading and Kindlin-1 on cell invasion. In line with these experimental observations, Kindlin-1 overexpression was associated with a worse patients’ outcome. Notably, Kindlin-3, expressed by tumor infiltrating leukocytes, also correlated with a poor prognosis of breast cancer patients. Conclusion This study demonstrates that each one of the Kindlin family members has a different expression profile emphasizing their redundant and complementary roles in breast tumor cells. We highlight the specific link between Kindlin-1 and breast cancer progression. In addition, Kindlin-3 overexpression in the tumor microenvironment is associated with more aggressive breast tumors. These results suggest that Kindlins play distinctive roles in breast cancer. Kindlins may be useful in identifying breast cancer patients with a worst prognosis and may offer new avenues for therapeutic intervention against cancer progression.

【 授权许可】

Unknown