Small molecule based fluorescent chemosensors for imaging the microenvironment within specific cellular regions

Understanding the cellular microenvironment is essential for deciphering the physiological and pathological roles of organelles. Factors such as pH, viscosity, and polarity influence organelle function, and disruptions can lead to disease. While fluorescent probes have been developed to monitor these factors, a recent comprehensive review has been lacking. Prior research has shown that fluorescent chemosensors can detect microenvironmental changes in specific cellular regions. However, no single source has systematically summarized recent advancements in small-molecule-based probes for this purpose. That uncertainty drove the need for a detailed review. This gap motivated researchers to compile and analyze recent progress in fluorescent probe design and application. The absence of a critical review on this topic since 2015 created a need for updated insights. The review addresses this by examining the latest developments in fluorescent chemosensors for organelle-specific imaging. This work aims to consolidate knowledge and guide further research in this area.

The purpose of this review is to compile recent advancements in fluorescent chemosensors for imaging the microenvironment in specific cellular regions. The study focuses on small-molecule-based probes developed since 2015. The motivation stems from the need to understand how microenvironmental factors affect organelle function. The review categorizes probes based on the organelles they target, such as mitochondria and lysosomes. It also classifies them by the microenvironmental factors they detect, like pH and hypoxia. The goal is to provide a structured overview of probe design and performance. This includes synthesis methods, recognition mechanisms, and bio-imaging applications. By analyzing current limitations and future directions, the review aims to guide further research and development in this field.

The authors conducted a systematic review of literature published since 2015. They focused on small-molecule fluorescent chemosensors for cellular microenvironment imaging. The review approach involved classifying probes by the organelles they target and the factors they detect. Suborganelle classifications were made based on polarity, viscosity, temperature, pH, and hypoxia. The synthesis, recognition mechanisms, and fluorescent signals of each probe were summarized. Bio-imaging applications were also analyzed for each category. Limitations of current probes were identified and discussed. The review structure allows for a comparative analysis of design principles and performance across different probe types.

The review highlights recent progress in fluorescent chemosensors for organelle-specific microenvironment imaging. Probes targeting mitochondria, lysosomes, and other organelles were categorized. Each probe’s design principles and synthesis methods were detailed. Recognition mechanisms and fluorescent signals were compared across categories. Applications in bio-imaging were summarized for each probe type. Limitations of current probes, such as selectivity and sensitivity, were identified. The review also outlines future directions for probe development. These findings provide a comprehensive overview of the current state of microenvironmental sensing in cellular regions.

The authors conclude that small-molecule fluorescent chemosensors have advanced significantly since 2015. These probes enable detailed imaging of the microenvironment in specific organelles. The review synthesizes findings on design principles, synthesis, and bio-imaging applications. Limitations, such as probe stability and selectivity, were identified. Future developments may focus on improving sensitivity and expanding target factors. The review proposes that further research should aim to enhance probe specificity and reduce interference. It suggests that addressing current limitations could lead to more accurate microenvironmental monitoring. The authors anticipate that this summary will guide future studies in this area.