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G-protein-mediated signaling and its control in macrophages and mammalian cells
1Biomembrane Division, Indian Institute of Chemical Biology, Calcutta. iichbio@giasclo1.vsnl.net
Abstract:
G-protein coupled receptor (GPCR) in various cell types exert its effects through heterotrimetic GTP-binding proteins (G-proteins). The interaction of specific ligand or agonists with CPCR transuces signal and enhances gene expression, mitogen activated protein kinase (MAP kinase) activation, and thus regulates cell proliferation, differentation, and motility. Abnormal signaling or prolonged activation of G-protein signaling pathways blocks normal functioning of various cells and tissues of our body. New insights into the mechanisms governing the specificity and temporal regulation of G-protein signaling pathways have been provided by the recent discovery of GTPase-activating proteins (GAPs) and RGS proteins (regulators of G-protein signaling). Different molecular biological approaches are now being employed to study the G-protein-mediated signaling and its control in various mammalian cells. Recent developments on the activation of phagocytic cells, especially macrophages, via ligation or cross-linking of GPCR and their postreceptor ligation effect against several intramacrophage pathogens are also discussed.
Insights
G-protein coupled receptors (GPCRs) signal through G-proteins, regulating cell functions. New regulators like GTPase-activating proteins (GAPs) and RGS proteins offer insights into controlling these vital pathways.
Area of Science:
- Cellular Biology
- Molecular Biology
- Immunology
Background:
- G-protein coupled receptors (GPCRs) mediate cellular responses via heterotrimeric G-proteins.
- GPCR signaling regulates critical cell functions including proliferation, differentiation, and motility.
- Dysregulated G-protein signaling disrupts normal cellular and tissue function.
Purpose of the Study:
- To explore the mechanisms governing G-protein signaling specificity and regulation.
- To discuss the role of novel regulators like GTPase-activating proteins (GAPs) and Regulators of G-protein Signaling (RGS) proteins.
- To review recent advancements in understanding GPCR activation in phagocytic cells, particularly macrophages, and their impact on intracellular pathogens.
Main Methods:
- Utilizing various molecular biological approaches to study G-protein-mediated signaling.
- Investigating GPCR activation through ligand binding and cross-linking.
- Analyzing post-receptor signaling events in macrophages.
Main Results:
- Discovery of GAPs and RGS proteins provides new understanding of G-protein signaling control.
- GPCR activation in macrophages influences responses to intracellular pathogens.
- G-protein signaling pathways are crucial for regulating cell proliferation, differentiation, and motility.
Conclusions:
- G-protein signaling is fundamental to cell function and tightly regulated by specific proteins.
- Understanding GPCRs and their regulators is key to deciphering cellular processes and disease mechanisms.
- Targeting G-protein pathways, especially in immune cells like macrophages, holds potential for therapeutic interventions against pathogens.