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A Dual-Modal NIR-FLIM Probe for Hypothalamic Norepinephrine Imaging in Neurogenic Hypertension
Shixia Tang1, Le Cheng1, Qidi Ling1
1Institute of Optical Materials and Chemical Biology, School of Chemistry and Chemical Engineering, Guangxi Key Laboratory of Electrochemical Energy Materials, Guangxi University, Nanning, Guangxi 530004, P. R. China.
Researchers developed novel probes for real-time monitoring of norepinephrine (NE) in the brain. This technology revealed NE
Area of Science:
- Neuroscience
- Biochemistry
- Medical Imaging
Background:
- Hypothalamic norepinephrine (NE) dysregulation is a key factor in hypertension.
- Current methods lack precise in vivo quantitative monitoring tools for NE.
Purpose of the Study:
- To engineer novel probes for spatiotemporal NE tracking in vivo.
- To establish a molecular platform linking NE dynamics to vascular pathology.
Main Methods:
- Development of CyQs probes integrating near-infrared (NIR) intensity and fluorescence lifetime imaging (FLIM).
- Utilizing CyQ-2 for NE-specific activation via nucleophilic cyclization.
- Mapping NE dynamics in PC12 cells and a hypertensive mouse model.
Main Results:
- CyQ-2 demonstrated a 16-fold fluorescence turn-on and a low detection limit (0.21 μM).
- FLIM quantified elevated hypothalamic NE in hypertensive mice, correlating with aortic wall thickening.
- Angiotensin II type 1 receptor blockade normalized NE levels and reversed vasculopathy.
Conclusions:
- Established a molecular platform for linking hypothalamic NE dynamics to vascular pathology.
- Enabled mechanistic dissection of neurogenic hypertension.
- Provided a tool for quantitative evaluation of neuromodulation therapies.
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