In Situ synNotch-Programmed Astrocytes Sense and Attenuate Neuronal Apoptosis

Area of Science:

• Neuroscience
• Biotechnology
• Molecular Biology

Background:

• Neuronal apoptosis is an early, silent indicator of chronic neurodegenerative diseases, preceding clinical symptoms.
• Current diagnostic methods often fail to detect these subtle, early pathological changes.

Purpose of the Study:

• To engineer a novel biosensor system for the early detection of neuronal apoptosis.
• To develop a method for converting imperceptible apoptotic signals into detectable outputs for improved diagnostics.

Main Methods:

• Engineered astrocytes using a dual-biomarker recognition synNotch system (dual-synNotch).
• The system employs an 'AND Gate' mechanism, detecting both phosphatidylserine (PS) and ganglioside Gt1b.
• Activated synNotch receptors induce expression of Gaussia luciferase (GLuc) and brain-derived neurotrophic factor (BDNF).

Main Results:

• The dual-synNotch system successfully identified neuronal apoptosis by simultaneously sensing PS and Gt1b.
• Activated system expressed GLuc, a blood-brain barrier-permeable reporter, and BDNF, a neuroprotective factor.
• The system effectively amplified early apoptotic signals into detectable outputs.

Conclusions:

• The engineered dual-synNotch system offers a promising strategy for early detection of neurodegenerative diseases.
• This approach enables in vitro monitoring and diagnosis by converting silent neuronal apoptosis into measurable signals.
• The system holds potential for early intervention, improving patient outcomes in neurodegenerative conditions.