Local Calcium Signals
Local Calcium Signals - Related Videos
03:39
In Vivo Calcium Imaging Using Synaptically Localized Calcium Sensors in Drosophila melanogaster
0 Views •
2025
This video demonstrates a method for in vivo calcium imaging using synaptically localized calcium sensors in flies. It outlines the steps for preparing the flies for microscopy, conducting olfactory conditioning, and visualizing odor-induced calcium influx.
09:30
Imaging Local Ca2+ Signals in Cultured Mammalian Cells
0 Views •
Cited by 17 •
2015
Here we present techniques for imaging local IP3-mediated Ca2+ events using fluorescence microscopy in intact mammalian cells loaded with Ca2+ indicators together with an algorithm that automates identification and analysis of these events.
01:46
Nuclear Localization Signals and Import
0 Views •
2023
Proteins targeted to the nucleus carry short stretches of amino acid sequences called the nuclear localization signal or NLS. Classical nuclear localization signals are of two types: monopartite and bipartite NLS. Monopartite classical NLS (cNLS) consists of a single cluster of 4-8 amino acids. Bipartite cNLS consists of two clusters of 2-3 amino acids and a 9-12 residue long proline-rich linker bridging the two clusters. Signal clusters are rich in positively charged amino acids such as...
10:33
Local Field Fluorescence Microscopy: Imaging Cellular Signals in Intact Hearts
0 Views •
Cited by 8 •
2017
In the heart, molecular events coordinate the electrical and contractile function of the organ. A set of local field fluorescence microscopy techniques presented here enables the recording of cellular variables in intact hearts. Identifying mechanisms defining the cardiac function is critical in understanding how the heart works under pathological situations.
08:21
Real-time In Vivo Recording of Arabidopsis Calcium Signals During Insect Feeding Using a Fluorescent Biosensor
0 Views •
Cited by 9 •
2017
This protocol outlines a simple method for analyzing calcium signals in plants generated by feeding hemipteran insects, such as aphids. Arabidopsis thaliana transformed with the GFP calcium biosensor GCaMP3 allow for the real-time in vivo imaging of calcium dynamics with a high temporal and spatial resolution.
FAQs
Spatial restriction keeps calcium concentrations high near selected molecular targets while limiting effects elsewhere in the cell. This arrangement allows a nearby calcium-sensitive protein to respond without activating unrelated processes throughout the cytosol. As a result, cells can link a particular electrical or chemical stimulus to a localized response, improving control over events such as secretion, contraction, trafficking, or movement.
Buffers, pumps, and exchangers determine how far calcium spreads and how long it remains available near its entry or release site. Their activity influences signal amplitude and duration, thereby controlling whether nearby calcium-sensitive proteins are activated. These components help prevent a local event from becoming a broader cytosolic calcium increase and contribute to the timing and precision of cellular responses.
Calcium may enter through channels in the plasma membrane or emerge from intracellular stores, giving cells more than one way to create a localized signal. The source places calcium near different cellular regions and molecular targets, while subsequent diffusion and calcium removal shape the resulting microdomain. This organization helps connect distinct stimuli with appropriate downstream processes.
Local calcium signals regulate several nearby processes, including neurotransmitter release, muscle contraction, membrane trafficking, and cell motility. In each case, calcium-sensitive proteins positioned near the signal can translate a short-lived calcium change into a specific action. This local control is especially important when a cell must coordinate activity at one site without disrupting calcium-dependent functions elsewhere.
Examining these signals helps explain how cells convert electrical or chemical stimuli into precisely located responses. It also reveals how the timing, amplitude, and spatial reach of calcium changes influence nearby molecular targets. This perspective connects calcium handling with the organization of cellular behavior, showing why the same messenger can support different outcomes in different regions of a cell.
When calcium entry, release, diffusion, buffering, or removal becomes improperly controlled, local signals may reach inappropriate targets or persist for the wrong duration. Such changes can interfere with processes that depend on precise calcium regulation, including secretion, contraction, trafficking, and motility. Studying these disruptions therefore helps clarify how altered calcium handling contributes to biological dysfunction.