Une isoforme de Allograft Inflammatory Factor-1 (AIF1) impliquée dans le cancer du sein

Authors: Slim, Ferial Amira
Advisor: Durocher, FrancineDiorio, Caroline
Abstract: Breast cancer (BC) represents one of the most common and dangerous cancers in terms of mortality and incidence among women worldwide. It is even more recurrent in developed countries including Canada [2]. BC is a complex and multifactorial disorder, its severity and response to treatment differs from case to case and its diagnosis can be tricky due to the heterogeneity of the pathology. Thus, this project aims to study a potential BC risk factor that can be used for diagnosis and treatment of BC patients. Allograft Inflammatory Factor-1 (AIF1) is a protein involved in many inflammatory diseases that has also been associated with cancer, however, in most studies, only one isoform has been analyzed. Our analyses of the transcriptional profile of individuals from French Canadian families with high risk of BC (BRCA1/BRCA2 or not-BRCA1/2 (BRCAX)) identified significantly and differentially expressed transcripts between the different groups. Among them, two AIF1 splice variants were highly overexpressed in the BRCAX lymphoblastoid cell lines (LCLs) of the affected sister comparatively with her non-affected sister. Our gene expression analysis revealed that both isoforms were mostly expressed in the least aggressive BC and this expression resulted from the tumor microenvironment, AIF1v1 being mostly expressed by lymphocytes and AIF1v3 by activated macrophages. We also demonstrated the effect of docosahexaenoic omega-3 fatty acids (DHA) on the downregulation of AIF1 isoforms expression in BRCAX LCLs. Lastly, our data showed that AIF1 isoforms expression in breast tumors and breast adipose tissue correlated with metabolic and clinical parameters of BC patients. Ultimately, all data and information resulting from this study represent a major breakthrough for the scientific community and the cancer research field since it is the first study on AIF1v1 and its involvement in BC, breast tumor microenvironment and inflammatory reaction.
Document Type: Mémoire de maîtrise
Issue Date: 2018
Open Access Date: 18 April 2019
Permalink: http://hdl.handle.net/20.500.11794/34495
Grantor: Université Laval
Collection:Thèses et mémoires

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