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Phosphorylation of Bok at Ser-8 blocks its ability to suppress IPR-mediated calcium mobilization.
Cell Commun Signal
January 2025
Department of Pharmacology, SUNY Upstate Medical University, Syracuse, NY, 13210, USA.
Background: Bok is a poorly characterized Bcl-2 protein family member with roles yet to be clearly defined. It is clear, however, that Bok binds strongly to inositol 1,4,5-trisphosphate (IP) receptors (IPRs), which govern the mobilization of Ca from the endoplasmic reticulum, a signaling pathway required for many cellular processes. Also known is that Bok has a highly conserved phosphorylation site for cAMP-dependent protein kinase at serine-8 (Ser-8).
View Article and Find Full Text PDFIP3 receptor depletion in a spontaneous canine model of Charcot-Marie-Tooth disease 1J with amelogenesis imperfecta.
PLoS Genet
January 2025
Department of Veterinary Biosciences, Faculty of Veterinary Medicine, University of Helsinki, Helsinki, Finland.
Inositol 1,4,5-trisphosphate receptors (IP3R) mediate Ca2+ release from intracellular stores, contributing to complex regulation of numerous physiological responses. The involvement of the three IP3R genes (ITPR1, ITPR2 and ITPR3) in inherited human diseases has started to shed light on the essential roles of each receptor in different human tissues and cell types. Variants in the ITPR3 gene, which encodes IP3R3, have recently been found to cause demyelinating sensorimotor Charcot-Marie-Tooth neuropathy type 1J (CMT1J).
View Article and Find Full Text PDFRole of PI3 Kinases in Cell Signaling and Soleus Muscle Atrophy During Three Days of Unloading.
Int J Mol Sci
January 2025
Myology Laboratory, Institute of Biomedical Problems (IBP), RAS, 123007 Moscow, Russia.
During skeletal muscle unloading, phosphoinositide 3-kinase (PI3K), and especially PI3K gamma (PI3Kγ), can be activated by changes in membrane potential. Activated IP3 can increase the ability of Ca to enter the nucleus through IP3 receptors. This may contribute to the activation of transcription factors that initiate muscle atrophy processes.
View Article and Find Full Text PDFCharacterization of the Astrocyte Calcium Response to Norepinephrine in the Ventral Tegmental Area.
Cells
December 2024
Neuroscience Institute, Section of Padova, National Research Council (CNR), 35131 Padova, Italy.
Astrocytes from different brain regions respond with Ca elevations to the catecholamine norepinephrine (NE). However, whether this noradrenergic-mediated signaling is present in astrocytes from the ventral tegmental area (VTA), a dopaminergic circuit receiving noradrenergic inputs, has not yet been investigated. To fill in this gap, we applied a pharmacological approach along with two-photon microscopy and an AAV strategy to express a genetically encoded calcium indicator in VTA astrocytes.
View Article and Find Full Text PDFChannels, Transporters, and Receptors at Membrane Contact Sites.
Contact (Thousand Oaks)
December 2024
Department of Physiology and Membrane Biology, University of California, Davis, CA, USA.
Membrane contact sites (MCSs) are specialized regions where two or more organelle membranes come into close apposition, typically separated by only 10-30 nm, while remaining distinct and unfused. These sites play crucial roles in cellular homeostasis, signaling, and metabolism. This review focuses on ion channels, transporters, and receptors localized to MCSs, with particular emphasis on those associated with the plasma membrane and endoplasmic reticulum (ER).
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