Gas vesicle expression in stem cells and the potential as a biomarker application

Gas vesicles (GVs) are highly promising contrast agents that have been actively investigated throughout the development of contrast agents. Unlike chemically synthesized materials, GVs offer distinct advantages in bio-related studies due to their biocompatibility, making them a safer alternative to existing agents. GVs are gas-filled structures found in microorganisms, enabling their host to remain buoyant in aqueous environments. Since GVs are composed of gas vesicle proteins, it is possible to genetically encode specific cell lines to express gas vesicles at will. However, whether these cells can be utilized in clinical trials to self-contain contrast agents has not been fully explored. In recent years, we have been investigating efficient methods to express GVs in stem cells, which could function as a repeatable contrast agent. To achieve this, we employed a drug selection technique to isolate stem cells that contain gas vesicle genes. Traditional isolation methods required fluorescence-activated cell sorting (FACS) followed by single-cell cloning, which was time-consuming and costly. These findings may guide researchers in cultivating GV-containing stem cells, potentially differentiating them into desired cell types for implantation into organs that require biomarkers.