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The inositol trisphosphate receptor gene family: implications for normal and abnormal brain function
1Department of Psychiatry, Johns Hopkins University School of Medicine, Baltimore, Maryland.
Progress in Neuro-Psychopharmacology & Biological Psychiatry
|January 1, 1994
Summary
This review focuses on inositol 1,4,5-trisphosphate (IP3) receptors, key regulators of intracellular calcium release. Research links the IP3 system to bipolar disorder and lithium treatment, highlighting its therapeutic potential.
Area of Science:
- Biochemistry
- Cell Biology
- Neuroscience
Background:
- The phosphatidyl inositol (PI) system is crucial for cellular signaling.
- Inositol 1,4,5-trisphosphate (IP3) is a key second messenger in this pathway.
- The IP3 receptor (IP3R) controls calcium release from intracellular stores.
Purpose of the Study:
- To review the characterization and function of the IP3 receptor.
- To explore the molecular structure and regulation of IP3R.
- To discuss the potential link between the PI system, IP3R, and bipolar disorder.
Main Methods:
- Purification and reconstitution of IP3R.
- Localization and functional studies of IP3R.
- cDNA cloning and molecular structure analysis of IP3R.
Main Results:
- IP3 binding to IP3R triggers calcium release.
- IP3R activity is modulated by pH, calcium, adenine nucleotides, and phosphorylation.
- Multiple IP3R subtypes and alternative splicing variants exist.
- Evidence suggests a role for the PI system and IP3R in bipolar disorder.
Conclusions:
- The IP3 receptor is a complex, multi-subunit protein with diverse regulatory mechanisms.
- Understanding IP3R function is vital for unraveling cellular signaling pathways.
- The IP3 system represents a potential target for treating bipolar disorder.