Voltage sensitive dyes, the probes used to study the electrophysiology of
neurons, were genetically targeted to cells via the chemical modification
of their aliphatic tails to introduce an N-phosphonooxymethyl quaternary
amine salt. This yielded soluble, non-binding prodyes that were substrates
for membrane-anchored PLAP, to produce an amphiphilic dye that binds to
the cell membrane. The prodye di-1,8P6-ANEPPS showed excellent selective
staining, with the activated dye showing good voltage sensitivity. To use
the prodyes in neural networks, Cre recombinase was fused to Tetanus
neurotoxin, to undergo trans-synaptic retrograde transport and be
delivered into the cytosol. The system is designed to activate a ‘gene
switch’ to induce the expression of PLAP, and hence label functional
neural circuits with voltage sensitive dye. The fusion protein was tested
to for recombinase activity, and is now ready for testing in brain tissue.
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Voltage sensitive dyes, the probes used to study the electrophysiology of
neurons, were genetically targeted to cells via the chemical modification
of their aliphatic tails to introduce an N-phosphonooxymethyl quaternary
amine salt. This yielded soluble, non-binding prodyes that were substrates
for membrane-anchored PLAP, to produce an amphiphilic dye that binds to
the cell membrane. The prodye di-1,8P6-ANEPPS showed excellent selective
staining, with the activated dye showing good voltage...
»