ArticleProceedings of the National Academy of Sciences of the United States of America2008
Synaptotagmin-1 and -7 are functionally overlapping Ca2+ sensors for exocytosis in adrenal chromaffin cells.
Article in Proceedings of the National Academy of Sciences of the United States of America, 2008. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 105 papers.
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105 citing papers in PubMed, 186 citations in OpenAlex.
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- Context-tuned strategies for marker selection precision in neuronal studies.Frontiers in neuroscience · 2026Review
- Cellular mechanisms of hormone secretion in neuroendocrine tumors: what goes wrong?Frontiers in cell and developmental biology · 2025Review
- Article
- Synaptotagmin-7 outperforms synaptotagmin-1 to promote the formation of large, stable fusion pores via robust membrane penetration.Nature communications · 2023Article
- Maximal Fusion Capacity and Efficient Replenishment of the Dense Core Vesicle Pool in Hippocampal Neurons.The Journal of neuroscience : the official journal of the Society for Neuroscience · 2023Article
- High-speed imaging reveals the bimodal nature of dense core vesicle exocytosis.Proceedings of the National Academy of Sciences of the United States of America · 2023Article
- Phorbolester-activated Munc13-1 and ubMunc13-2 exert opposing effects on dense-core vesicle secretion.eLife · 2022Article
- Vesicle trafficking and vesicle fusion: mechanisms, biological functions, and their implications for potential disease therapy.Molecular biomedicine · 2022Review
- Synaptotagmins 1 and 7 Play Complementary Roles in Somatodendritic Dopamine Release.The Journal of neuroscience : the official journal of the Society for Neuroscience · 2022Article
- Deconstructing Synaptotagmin-1's Distinct Roles in Synaptic Vesicle Priming and Neurotransmitter Release.The Journal of neuroscience : the official journal of the Society for Neuroscience · 2022Article
- 16pdel lipid changes in iPSC-derived neurons and function of FAM57B in lipid metabolism and synaptogenesis.iScience · 2022Article
- Article
- Exocytosis in Astrocytes.Biomolecules · 2021Review
- Neuromodulator release in neurons requires two functionally redundant calcium sensors.Proceedings of the National Academy of Sciences of the United States of America · 2021Article
- Function of Drosophila Synaptotagmins in membrane trafficking at synapses.Cellular and molecular life sciences : CMLS · 2021Review
- A novel dual Ca2+ sensor system regulates Ca2+-dependent neurotransmitter release.The Journal of cell biology · 2021Article
- Synaptotagmin-7 places dense-core vesicles at the cell membrane to promote Munc13-2- and CaeLife · 2021Article
- The Role of Calmodulin vs. Synaptotagmin in Exocytosis.Frontiers in molecular neuroscience · 2021Review
45 more citing papers are in PubMed but not listed here.
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5 authors at 3 institutions in 2 countries.
Funding
No grant is acknowledged in the PubMed record.
Abstract
Synaptotagmin-1, the canonical isoform of the synaptotagmin family, is a Ca(2+) sensor for fast synchronous neurotransmitter release in forebrain neurons and chromaffin cells. Even though deletion of synaptotagmin-1 abolishes fast exocytosis in chromaffin cells, it reduces overall secretion by only 20% because of the persistence of slow exocytosis. Therefore, another Ca(2+) sensor dominates release in these cells. Synaptotagmin-7 has a higher Ca(2+) affinity and slower binding kinetics than synaptotagmin-1, matching the proposed properties for the second, slower Ca(2+) sensor. Here, we examined Ca(2+)-triggered exocytosis in chromaffin cells from KO mice lacking synaptotagmin-7, and from knockin mice containing normal levels of a mutant synaptotagmin-7 whose C(2)B domain does not bind Ca(2+). In both types of mutant chromaffin cells, Ca(2+)-triggered exocytosis was decreased dramatically. Moreover, in chromaffin cells lacking both synaptotagmin-1 and -7, only a very slow release component, accounting for approximately 30% of WT exocytosis, persisted. These data establish synaptotagmin-7 as a major Ca(2+) sensor for exocytosis in chromaffin cells, which, together with synaptotagmin-1, mediates almost all of the Ca(2+) triggering of exocytosis in these cells, a surprising result, considering the lack of a role of synaptotagmin-7 in synaptic vesicle exocytosis.
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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.