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Published on: July 10, 2018
STIM Protein-NMDA2 Receptor Interaction Decreases NMDA-Dependent Calcium Levels in Cortical Neurons
Joanna Gruszczynska-Biegala1,2, Klaudia Strucinska1, Filip Maciag1
1Laboratory of Neurodegeneration, International Institute of Molecular and Cell Biology in Warsaw, 02-109 Warsaw, Poland.
Neuronal Store-Operated Calcium Entry (nSOCE) is modulated by NMDA receptors. STIM proteins interact with NMDA receptor subunits, influencing calcium levels and offering therapeutic targets for neurological disorders.
Area of Science:
- Neuroscience
- Cell Biology
- Calcium Signaling
Background:
- Neuronal Store-Operated Calcium Entry (nSOCE) is vital for neuronal calcium homeostasis and function.
- STIM proteins (STIM1, STIM2) are key regulators of nSOCE, influencing various ion channels and receptors.
- The precise relationship between STIM proteins, nSOCE, and NMDA receptors (NMDARs) in neurons is not fully understood.
Purpose of the Study:
- To investigate the functional link between STIM proteins, nSOCE, and NMDAR-mediated calcium influx in rat cortical neurons.
- To elucidate the molecular mechanisms underlying the interaction between STIM proteins and NMDARs.
- To explore the therapeutic potential of modulating this interaction for neuropathological conditions.
Main Methods:
- Calcium imaging to measure intracellular calcium ([Ca2+]i) changes.
- Pharmacological inhibition of nSOCE and NMDARs.
- Genetic manipulation of STIM protein levels (overexpression and shRNA).
- Biochemical and imaging techniques including proximity ligation assays, immunofluorescence, and co-immunoprecipitation.
Main Results:
- Thapsigargin-induced nSOCE was inhibited by NMDAR inhibitors.
- Pharmacological blockade of nSOCE potentiated NMDA receptor-driven calcium influx.
- Modulation of STIM protein levels directly affected NMDA-evoked calcium influx.
- STIM proteins were found to interact with NMDAR2 subunits in a manner dependent on thapsigargin stimulation.
Conclusions:
- STIM proteins directly interact with NMDAR2 subunits, influencing NMDAR-mediated calcium entry.
- This interaction suggests a novel regulatory mechanism for neuronal calcium signaling.
- Targeting the STIM-NMDAR interaction presents a potential therapeutic strategy for conditions involving NMDA-induced calcium overload.
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