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Innervation density governs crosstalk of GPCR-based norepinephrine and dopamine sensors

Lopez, R. C.; Noble, N.; Ozcete, O. D.; Cai, X.; Handy, G. E.; Andersen, J. W.; Patriarchi, T.; Li, Y.; Kaeser, P. S.

2024-11-23 neuroscience
10.1101/2024.11.23.624963 bioRxiv
Show abstract

GPCR-based fluorescent sensors are widely used to correlate neuromodulatory signaling with brain function. While experiments in transfected cells often reveal selectivity for individual neurotransmitters, sensor specificity in the brain frequently remains uncertain. Pursuing experiments in brain slices and in vivo, we find that norepinephrine and dopamine cross-activate the respective sensors. Non-specific activation occurred when innervation of the cross-reacting transmitter was high, and silencing of specific innervation was indispensable for interpreting sensor fluorescence.

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