Purpose: Galectin-3 is a Mr 31,000 protein that belongs to a family of carbohydrate-binding proteins. Galectin-3 has already been associated with protection against apoptosis through cell to cell or cell to matrix adhesion processes. It seems that galectin-3 plays an important role in tumor progression, cell growth, invasion and metastasis. Galectin-3 is the only member of the chimeric galectins that has an N-terminal glycine and proline domain and a C-terminal carbohydrate recognition domain that allows galectin-3 to accommodate larger structures such us polylactosaminoglycans and intervene to DNA damage repair process. In this systematic review, our primary goal is to identify the effect of galectin-3 expression in association with drug resistance and apoptosis inhibition in breast cancer.
Materials and methods: Scopus and PubMed databases were searched on 26 November 2018 using the following combination of keywords: (galectin-3 OR gal-3 OR LGALS3) AND (breast cancer) AND (chemoresistance OR (drug resistance) OR chemosensitivity). All the articles in English, regardless the time of publication, text availability and species included were initially accepted.
Results: In the majority of the included studies, the expression of galectin-3 had a protective role in cell survival via different pathways such as the response to DNA damage and repair or the inhibition of apoptosis after treatment with a chemotherapeutic agent.
Conclusion: Galectin-3 expression in breast tumors might be an important factor in the selection of the most suitable treatment.
Keywords: Breast cancer; Chemoresistance; Chemosensitivity; Drug-induced apoptosis; Galectin-3.