Store-operated calcium entry: unveiling the calcium handling signalplex

Area of Science:

• Cellular Biology
• Physiology
• Biochemistry

Background:

• Store-operated Ca(2+) entry (SOCE) is a critical calcium influx pathway in both excitable and non-excitable cells.
• The precise mechanisms regulating SOCE, including store sensing and channel function, have been extensively studied.
• Intracellular agonist-sensitive calcium compartments play a crucial role in SOCE regulation.

Purpose of the Study:

• To review the current understanding of store-operated calcium entry (SOCE) mechanisms.
• To elucidate the roles of STIM1, Orai1, and TRPC proteins in SOCE.
• To summarize advances in the field of SOCE activation.

Main Methods:

• Literature review of studies on store-operated calcium entry.
• Analysis of research identifying key proteins involved in SOCE.
• Synthesis of current hypotheses and experimental findings.

Main Results:

• STIM1 identified as the endoplasmic reticulum calcium sensor.
• Orai1 identified as the pore-forming subunit for calcium-selective SOCE.
• TRPC proteins implicated as channels mediating cation-permeable SOCE.

Conclusions:

• The identification of STIM1 and Orai1 has significantly advanced the understanding of SOCE.
• SOCE activation is tightly linked to the filling state of intracellular calcium stores.
• Ongoing research continues to refine our knowledge of SOCE pathways and their functional implications.