Marosi, Endre Levente and Arszovszki, Antónia and Brunner, János and Szabadics, János (2023) Similar Presynaptic Action Potential-Calcium Influx Coupling in Two Types of Large Mossy Fiber Terminals Innervating CA3 Pyramidal Cells and Hilar Mossy Cells. ENEURO, 10 (2). ISSN 2373-2822
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Abstract
Morphologically similar axon boutons form synaptic contacts with diverse types of postsynaptic cells. However, it is less known to what extent the local axonal excitability, presynaptic action potentials (APs), and AP-evoked calcium influx contribute to the functional diversity of synapses and neuronal activity. This is particularly interesting in synapses that contact cell types that show only subtle cellular differences but fulfill completely different physiological functions. Here, we tested these questions in two synapses that are formed by rat hippocampal granule cells (GCs) onto hilar mossy cells (MCs) and CA3 pyramidal cells, which albeit share several morphologic and synaptic properties but contribute to distinct physiological functions. We were interested in the deterministic steps of the action potential-calcium ion influx coupling as these complex modules may underlie the functional segregation between and within the two cell types. Our systematic comparison using direct axonal recordings showed that AP shapes, Ca 2+ currents and their plasticity are indistinguishable in synapses onto these two cell types. These suggest that the complete module that couples granule cell activity to synaptic release is shared by hilar mossy cells and CA3 pyramidal cells. Thus, our findings present an outstanding example for the modular composition of distinct cell types, by which cells employ different components only for those functions that are deterministic for their specialized functions, while many of their main properties are shared.
| Item Type: | Article |
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| Additional Information: | Export Date: 18 February 2023 Correspondence Address: Szabadics, J.; Institute of Experimental MedicineHungary; email: szabadics.janos@koki.hu Chemicals/CAS: calcium, 7440-70-2, 14092-94-5; Calcium Funding details: European Research Council, ERC, ERC-CoG 772452 Funding details: Magyar Tudományos Akadémia, MTA, ÚNKP-19-2-I-ELTE-203 Funding text 1: This work was supported by the European Research Council Grant ERC-CoG 772452, the János Bolyai Research Scholarship of the Hungarian Academy of Sciences (J.B. and J.S.), Stephen W. Kuffler Research Scholarship and the New National Excellence Programme Scholarship Grant ÚNKP-19-2-I-ELTE-203 (to E.L.M.). |
| Uncontrolled Keywords: | dentate gyrus; Hilus; CALCIUM CURRENTS; CA3; CA2; axonal physiology; |
| Subjects: | R Medicine / orvostudomány > R1 Medicine (General) / orvostudomány általában > R850-854 Experimental medicine / kisérleti orvostudomány R Medicine / orvostudomány > RC Internal medicine / belgyógyászat > RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry / idegkórtan, neurológia, pszichiátria |
| SWORD Depositor: | MTMT SWORD |
| Depositing User: | MTMT SWORD |
| Date Deposited: | 01 Mar 2023 14:00 |
| Last Modified: | 01 Mar 2023 14:00 |
| URI: | http://real.mtak.hu/id/eprint/160989 |
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