Rational design of genetically encoded reporter genes for optical imaging of apoptosis
Zhijing Xu1, Yingzhuang Song1, Fu Wang2,3
1Institute of Medical Research, Northwestern Polytechnical University, Xi'an, 710072, China.
Abstract:
Apoptosis is a process in which cells are genetically regulated to cause a series of changes in morphology and metabolic activity, which ultimately lead to cell death. Apoptosis plays a vital role in the entire life cycle of an organism. Too much or too little apoptosis can cause a variety of diseases. Therefore, efficient and convenient methods for detecting apoptosis are necessary for clinical treatment and drug development. Traditional methods for detecting apoptosis may cause damage to the body during sample collection, such as for flow cytometry analysis. So it is necessary to monitor apoptosis without invasion in vivo. Optical imaging technique provides a more sensitive and economical way for apoptosis visualization. A subset of engineered reporter genes based on fluorescent proteins or luciferases are currently developed to monitor the dynamic changes in apoptotic markers, such as activation of caspases and exposure of phosphatidylserine on the surface of dying cells. These reporters detect apoptosis when cells have not undergone significant morphological changes, providing conditions for early diagnosis of tumors. In addition, these reporters show considerable value in high-throughput screening of apoptosis-related drugs and evaluation of their efficacy in treating tumors. In this review, we will discuss the recent research progress in the optical imaging of apoptosis based on the genetically encoded reporter genes.
Insights
Optical imaging with genetically encoded reporters offers a non-invasive method to detect apoptosis (programmed cell death) early. This technique aids in diagnosing diseases like cancer and screening drugs for tumor treatment.
Area of Science:
- Biomedical imaging
- Molecular biology
- Cellular processes
Background:
- Apoptosis, or programmed cell death, is crucial for organism development and health.
- Dysregulation of apoptosis contributes to various diseases, necessitating accurate detection methods.
- Current apoptosis detection methods can be invasive, limiting in vivo monitoring.
Purpose of the Study:
- To review advancements in optical imaging for apoptosis detection using genetically encoded reporters.
- To highlight the potential of these reporters for early disease diagnosis and drug development.
Main Methods:
- Development of engineered reporter genes encoding fluorescent proteins or luciferases.
- Monitoring dynamic changes in apoptotic markers like caspase activation and phosphatidylserine exposure.
- Utilizing optical imaging techniques for sensitive and economical visualization of apoptosis in vivo.
Main Results:
- Genetically encoded reporters enable early detection of apoptosis before significant morphological changes occur.
- Optical imaging facilitates non-invasive monitoring of apoptosis, crucial for in vivo studies.
- Reporter systems demonstrate value in high-throughput drug screening and efficacy evaluation for cancer treatment.
Conclusions:
- Optical imaging with genetically encoded reporters provides a powerful, non-invasive tool for studying apoptosis.
- This approach supports early tumor diagnosis and accelerates the development and assessment of novel therapeutics.
