bioRxiv Science⌕ Search

Biology subjects

Papanikolaou, S.

Publications and source records attributed to Papanikolaou, S..

2 recordsLinked to original sources

Poly-unsaturated Fatty Acids from Thamnidium elegans and Mortierella alpina Suppress Prostate Cancer Cells Proliferation and Migration

Thamnidium elegans and Mortierella alpina are two oleaginous fungi that belong to Mucoromycota that synthesize polyunsaturated fatty acids which are credited with multiple health benefits and possible anticancer properties. These fungi were cultivated on culture media with glucose or glycerol as a carbon source. After extracting the lipids, we transformed them into fatty acid lithium salts (FALS), which are water-soluble and absorbable mammalian cells, including DU-145 and PC-3 cancer cells. The two cell lines, both long-established prostate cancer models, were treated with FALS and indicated increased susceptibility to the lipid derivatives. The viability and proliferation rates were significantly reduced, as well as their migratory capabilities, which were significantly impaired compared to olive-oil-derived FALS, which were used as a control substance. We conclude that the FALS derivatives of microbial lipids from these organisms exhibit anticancer effects by suppressing the proliferation and migration of human prostate cancer cell lines.

cancer biology↗

The Wnt/TCF7L1 transcriptional repressor axis drives primitive endoderm formation by antagonizing naive and formative pluripotency

Early during preimplantation development and in heterogeneous mouse embryonic stem cells (mESC) culture, pluripotent cells are specified towards either the primed epiblast or the primitive endoderm (PE) lineage. Canonical Wnt signaling is crucial for safeguarding naive pluripotency and embryo implantation, yet the role and relevance of canonical Wnt inhibition during early mammalian development remains unknown. Here, we demonstrate that transcriptional repression exerted by Wnt/TCF7L1 promotes PE differentiation of mESCs and in preimplantation inner cell mass. Time-series RNA sequencing and promoter occupancy data reveal that TCF7L1 binds and represses genes encoding essential naive pluripotency factors and indispensable regulators of the formative pluripotency program, including Otx2 and Lef1. Consequently, TCF7L1 promotes pluripotency exit and suppresses epiblast lineage formation, thereby driving cells into PE specification. Conversely, deletion of Tcf7l1 abrogates PE differentiation without restraining epiblast priming. Taken together, our study underscores the importance of transcriptional Wnt inhibition in regulating lineage segregation in ESCs and preimplantation embryo development as well as identifies TCF7L1 as key regulator of this process.

developmental biology↗