Subtopic Deep Dive
Store-Operated Calcium Entry
Research Guide
What is Store-Operated Calcium Entry?
Store-Operated Calcium Entry (SOCE) is a calcium influx mechanism in non-excitable cells triggered by depletion of endoplasmic reticulum calcium stores via Orai1-STIM1 coupling in CRAC channels.
SOCE sustains calcium signaling for processes including gene expression, cell proliferation, and immune activation. Key components include STIM1 as ER Ca2+ sensor and Orai1 as plasma membrane channel (Zhang et al., 2005, 1362 citations). Over 10 major papers since 1995 define its molecular basis, with foundational work exceeding 1000 citations each.
Why It Matters
SOCE dysregulation causes severe combined immunodeficiency (SCID) due to CRAC channel defects (Feske, 2007). Therapeutic inhibitors target SOCE in immune disorders and epithelial cell pathologies (Prakriya and Lewis, 2015). Parekh and Putney (2005) highlight SOCE's role in exocytosis, enzyme control, and apoptosis across metazoan cells.
Key Research Challenges
STIM1-Orai1 Coupling Regulation
Precise mechanisms of STIM1 translocation and Orai1 gating remain unclear despite structural insights. Zhang et al. (2005) showed STIM1 migration to plasma membrane activates CRAC. Prakriya and Lewis (2015) note unresolved conformational changes.
SOCE Inhibitors Development
Specific CRAC inhibitors lack clinical translation due to off-target effects. Parekh and Putney (2005) review pathways but highlight inhibitor selectivity issues. Feske (2007) links SOCE to lymphocyte diseases needing targeted therapies.
Trafficking in Disease Contexts
SOCE trafficking defects underlie SCID and epithelial disorders. Zhang et al. (2006) RNAi screen identifies regulators of CRAC activity. Berridge (1995) foundational capacitative entry model requires disease-specific validation.
Essential Papers
Store-Operated Calcium Channels
Anant B. Parekh, James W. Putney · 2005 · Physiological Reviews · 2.1K citations
In electrically nonexcitable cells, Ca 2+ influx is essential for regulating a host of kinetically distinct processes involving exocytosis, enzyme control, gene regulation, cell growth and prolifer...
Direct activation of human TRPC6 and TRPC3 channels by diacylglycerol
Thomas Hofmann, Alexander G. Obukhov, Michael Schaefer et al. · 1999 · Nature · 1.5K citations
STIM1 is a Ca2+ sensor that activates CRAC channels and migrates from the Ca2+ store to the plasma membrane
Shenyuan L. Zhang, Ying Yu, Jack Roos et al. · 2005 · Nature · 1.4K citations
Capacitative calcium entry
Michael J. Berridge · 1995 · Biochemical Journal · 1.1K citations
Research Article| November 15 1995 Capacitative calcium entry M J Berridge M J Berridge 1The Babraham Institute Laboratory of Molecular Signalling, Department of Zoology, University of Cambridge, D...
Calcium signalling in lymphocyte activation and disease
Stefan Feske · 2007 · Nature reviews. Immunology · 1.0K citations
Heat-Evoked Activation of the Ion Channel, TRPV4
Ali D. Güler, Hyosang Lee, Tohko Iida et al. · 2002 · Journal of Neuroscience · 997 citations
The mammalian nervous system constantly evaluates internal and environmental temperatures to maintain homeostasis and to avoid thermal extremes. Several members of the transient receptor potential ...
TRP channel activation by reversible covalent modification
A. Scott Hinman, Huai-hu Chuang, Diana M. Bautista et al. · 2006 · Proceedings of the National Academy of Sciences · 875 citations
Allyl isothiocyanate, the pungent principle of wasabi and other mustard oils, produces pain by activating TRPA1, an excitatory ion channel on sensory nerve endings. Isothiocyanates are membrane-per...
Reading Guide
Foundational Papers
Start with Parekh and Putney (2005, 2072 citations) for SOCE overview in non-excitable cells; Berridge (1995, 1105 citations) for capacitative entry concept; Zhang et al. (2005, 1362 citations) for STIM1 discovery.
Recent Advances
Prakriya and Lewis (2015, 1170 citations) updates SOC mechanisms; Feske (2007, 1003 citations) covers lymphocyte diseases.
Core Methods
Core techniques: genome-wide RNAi (Zhang et al., 2006), ER Ca2+ imaging, whole-cell patch-clamp for I_CRAC currents, diacylglycerol activation assays (Hofmann et al., 1999).
How PapersFlow Helps You Research Store-Operated Calcium Entry
Discover & Search
Research Agent uses searchPapers('Store-Operated Calcium Entry Orai1 STIM1') to retrieve 250M+ OpenAlex papers, then citationGraph on Parekh and Putney (2005, 2072 citations) maps influential SOCE reviews. findSimilarPapers expands to related CRAC mechanisms; exaSearch queries 'STIM1 trafficking immune cells' for niche results.
Analyze & Verify
Analysis Agent applies readPaperContent on Zhang et al. (2005) to extract STIM1 migration details, then verifyResponse with CoVe chain-of-verification cross-checks claims against Feske (2007). runPythonAnalysis processes calcium flux data with NumPy/pandas for statistical verification; GRADE grading scores evidence strength for SCID links.
Synthesize & Write
Synthesis Agent detects gaps in SOCE inhibitor selectivity from Prakriya and Lewis (2015), flags contradictions in TRPC vs CRAC roles. Writing Agent uses latexEditText for manuscript drafting, latexSyncCitations integrates BibTeX from 10+ papers, latexCompile previews; exportMermaid diagrams STIM1-Orai1 pathways.
Use Cases
"Analyze calcium influx kinetics from Zhang et al. 2005 with custom plots"
Research Agent → searchPapers → readPaperContent (extracts flux data) → Analysis Agent → runPythonAnalysis (NumPy/matplotlib plots I-V curves, stats tests) → researcher gets publication-ready figures and p-values.
"Draft review section on SOCE in lymphocytes with citations"
Synthesis Agent → gap detection (Feske 2007 + Prakriya 2015) → Writing Agent → latexEditText (writes para) → latexSyncCitations (10 papers) → latexCompile → researcher gets compiled LaTeX PDF section.
"Find code for STIM1-Orai1 simulations from recent papers"
Research Agent → paperExtractUrls (from Zhang 2006 RNAi screen) → paperFindGithubRepo → githubRepoInspect → researcher gets runnable Python sims for CRAC models with README.
Automated Workflows
Deep Research workflow scans 50+ SOCE papers via searchPapers → citationGraph → structured report with GRADE scores on STIM1 mechanisms. DeepScan 7-step analyzes Prakriya (2015) with CoVe checkpoints, runPythonAnalysis on flux data. Theorizer generates hypotheses on Orai1 inhibitors from Feske (2007) + recent gaps.
Frequently Asked Questions
What defines Store-Operated Calcium Entry?
SOCE is Ca2+ influx activated by ER store depletion through Orai-STIM coupling in CRAC channels (Parekh and Putney, 2005).
What are key methods in SOCE research?
Methods include RNAi screens for regulators (Zhang et al., 2006), patch-clamp for CRAC currents, and live-cell imaging of STIM1 puncta (Zhang et al., 2005).
What are seminal papers on SOCE?
Parekh and Putney (2005, 2072 citations) reviews channels; Zhang et al. (2005, 1362 citations) identifies STIM1; Berridge (1995, 1105 citations) defines capacitative entry.
What open problems exist in SOCE?
Challenges include selective CRAC inhibitors, precise STIM1-Orai1 gating, and trafficking in immune diseases like SCID (Feske, 2007; Prakriya and Lewis, 2015).
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Part of the Ion Channels and Receptors Research Guide