Publikasi Scopus FKUI 2021 per tanggal 31 Oktober 2021 (739 artikel)

Objective: To investigate the auto-induction of transforming growth factor-b1 (TGF-?1) in breast cancer stem cells (BCSCs) and its effect on cell viability and stemness. Methods: Human BCSCs (aldehyde dehydrogenase positive; ALDH+) were grown in serum-free Dulbecco's Modified Eagle Medium/Nutrient Mixture F12 (DMEM/F12) and treated for periods of 1, 2 and 4 hours with 0.1 ng/ml recombinant human TGF-?1 protein (rhTGF-?1). The medium was then replaced with serum-free DMEM/F12 without rhTGF-?1 for 24 hours. Cell viability was determined using a trypan blue exclusion assay. Type 1 TGF-? receptor (T?R1), TGF-?1, octamer-binding transcription factor 4 (OCT4) and aldehyde dehydrogenase 1 family member A1 (ALDH1A1) messenger RNA (mRNA) expression levels were analysed using quantitative real-Time reverse-Transcriptase polymerase chain reaction (RT-qPCR). The TGF-? protein level in the culture medium was determined using an enzyme-linked immunosorbent assay (ELISA). Results: The expression levels of rhTGF-?1, TGF-?1 and T?R1 mRNA significantly increased in BCSCs compared to control after treatment for 1 and 2 hours but decreased after 4 hours. This is in line with alteration of stemness gene, OCT4 and ALDH1A1 mRNA expressions. However, the secretion of newly synthesised TGF-?1 significantly increased after 2 hours. In contrast, viable BCSCs decreased after 1 hour and then gradually increased 2.7 times compared to control after 4 hours. Conclusion: TGF-?1 treatment in low concentration and for short period of time triggers its auto-induction in BCSCs, leading to increased cell viability and stemness gene expression via autocrine signalling. ? 2021 Pakistan Medical Association. All rights reserved.