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- W1993863025 abstract "Fluorometric calcium measurements have revealed presynaptic residual calcium (Ca(res)) to be an important regulator of synaptic strength. However, in the mammalian brain, it has not been possible to monitor Ca(res) in fibers that project from one brain region to another. Here, we label neuronal projections by injecting dextran-conjugated calcium indicators into brain nuclei in vivo. Currently available dextran conjugates distort Ca(res) due to their high affinity for calcium. Therefore, we synthesized a low-affinity indicator, fluo-4 dextran, that can more accurately measure the amplitude and time course of Ca(res). We then demonstrate the utility of fluo-4 dextran by measuring Ca(res) at climbing fiber presynaptic terminals. This method promises to facilitate the study of many synapses in the mammalian CNS, both in brain slices and in vivo." @default.
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- W1993863025 date "2000-07-01" @default.
- W1993863025 modified "2023-10-11" @default.
- W1993863025 title "Monitoring Presynaptic Calcium Dynamics in Projection Fibers by In Vivo Loading of a Novel Calcium Indicator" @default.
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- W1993863025 doi "https://doi.org/10.1016/s0896-6273(00)00006-4" @default.
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