A Coculture Based, 3D Bioprinted Ovarian Tumor Model Combining Cancer Cells and Cancer Associated Fibroblasts

Ovarian cancer remains a major public health issue due to its poor prognosis. To develop more effective therapies, it is crucial to set-up reliable models that closely mimic the complexity of the ovarian tumor's microenvironment. 3D bioprinting is currently a promising approach to build heterogenous and reproducible cancer models with controlled shape and architecture. However, this technology is still poorly investigated to model ovarian tumors. In this study, a 3D bioprinted ovarian tumor model combining cancer cells (SKOV-3) and cancer associated fibroblasts (CAFs) are described. The resulting tumor models show their ability to maintain cell viability and proliferation. Cells are observed to self-assemble in heterotypic aggregates. Moreover, CAFs are observed to be recruited and to circle cancer cells reproducing an in vivo process taking place in the tumor microenvironment. Interestingly, this approach also shows its ability to rapidly generate a high number of reproducible tumor models that can be subjected to usual characterizations (cell viability and metabolic activity; histology and immunological studies; and real-time imaging). Therefore, these ovarian tumor models can be an interesting tool for high throughput drug screening applications.

IN VITRO BIOSYNTHESIS AND ANTIMICROBIAL POTENTIAL OF BIOLOGICALLY REDUCED GRAPHENE OXIDE/AG NANOCOMPOSITE AT ROOM TEMPERATURE

Antimicrobial resistance is one of the most serious problems that continues to challenge the public health threats and agriculture sectors. The study highlighted one-step method for reduced graphene oxide/Ag nanocomposite (rGO/AgNC) biosynthesis using the supernatant of Escherichia coli D8 (MF062579) strain at room temperature and sunlight. The rGO/AgNC was characterized by UV-vis spectrophotometry, Fourier transform-infrared (FT-IR) spectroscopy and transmission electron microscopy (TEM). Results showed those the rGO-annealed AgNPs showed absorption peak at 430 nm and have been obtained with an average particle size of 8-17±9.1 nm. The MIC value of rGO/AgNC (6.25 μg/mL) showed in vitro antimicrobial inhibition against pathogenic bacterial strains such as Gram-negative bacteria (E. coli ATCC25922; 79%, Klebsiella pneumoniae ATCC33495; 87%) and Gram-positive bacteria (Staphylococcus aureus ATCC25923; 91% and Bacillus cereus ATCC6633; 53%) as well as Candida albicans ATCC10231; 60% as pathogenic yeast.