Recent progress in the imaging detection of enzyme activities .

Enzymatic activities are important for normal physiological processes and are also critical regulatory mechanisms for many pathologies. Identifying the enzyme activities has considerable importance in disease diagnoses and monitoring of the physiological metabolism. In the past few years, great strides have been made towards the imaging detection of enzyme activity based on optical modality, MRI modality, nuclear modality, photoacoustic modality and multifunctional modality. This review summarizes the latest advances in the imaging detection of enzyme activities reported within the past years, mainly concentrating on the probe design, imaging strategies and demonstration of enzyme activities . This review also highlights the potential challenges and the further directions of this field.