Calcium Dependency
Calcium Dependency - Related Videos
03:22
Calcium-Dependent Hydrophobic Interaction Chromatography: A Technique to Purify Calcium-Binding Proteins Based on Hydrophobic Interactions
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2025
In this video, we demonstrate the purification of calcium-binding protein from a dialyzed cell lysate through calcium-dependent hydrophobic interaction chromatography. The calcium-binding proteins expose a hydrophobic region upon binding with calcium, facilitating interaction with a hydrophobic group on resin. Later these proteins are eluted using calcium chelator EDTA that reverses the interaction.
08:43
Calcium Imaging in Neurons
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2023
Calcium ions play an integral role in neuron function: They act as intracellular signals that can elicit responses such as altered gene expression and neurotransmitter release from synaptic vesicles. Within the cell, calcium concentration is highly dynamic due to the presence of pumps that selectively transport these ions in response to a variety of signals. Calcium imaging takes advantage of intracellular calcium flux to directly visualize calcium signaling in living neurons.This video begins...
15:29
Whole-Cell Recording of Calcium Release-Activated Calcium (CRAC) Currents in Human T Lymphocytes
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Cited by 5 •
2010
We provide a step-by-step protocol for whole-cell patch clamp recording of Calcium Release-Activated Calcium (CRAC) currents in peripheral blood mononuclear cell-derived human T lymphocytes.
08:14
Assessing T-cell Receptor-Induced Calcium Influx Using a Calcium Indicator Dye
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2025
This video analyzes T-cell receptor-induced calcium influx in T-cells. Anti-CD3 antibodies activate the T-cell signaling pathways, leading to an increase in intracellular calcium ions that bind with Indo-1 dye. In flow cytometry, a spectrum shift from the calcium-free state to the calcium-bound state correlates with T-cell receptor-induced calcium influx.
03:39
In Vivo Calcium Imaging Using Synaptically Localized Calcium Sensors in Drosophila melanogaster
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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.
FAQs
The steep calcium gradient across a cell membrane creates a controlled difference between extracellular and intracellular ion concentrations. When stimulation changes calcium entry or release, intracellular calcium levels can shift rapidly. Those changes allow calcium to interact with regulatory proteins, connecting an outside signal to specific cellular responses rather than producing uncontrolled ion movement.
Calcium binding can alter a protein’s conformation, meaning its three-dimensional shape changes when calcium ions associate with it. This structural shift can modify the protein’s activity and allow it to regulate downstream processes. The mechanism explains how a transient change in calcium concentration can influence contraction, secretion, membrane excitability, or gene expression.
Internal stores provide a second source of calcium that can be mobilized without relying only on ion entry from outside the cell. Regulated release therefore expands the ways cells shape calcium signals in space and time. Its importance is especially clear when cells must coordinate rapid responses with precisely controlled intracellular ion levels.
A calcium signal can act quickly by changing protein activity involved in contraction, secretion, or membrane excitability. The same signaling principle can also influence gene expression, producing effects that extend beyond the initial stimulus. Calcium dependency therefore links immediate physiological actions with changes in cellular regulation that may persist after the original signal.
Calcium-dependent mechanisms are relevant to cell biology, neuroscience, physiology, development, and pharmacology. In cell biology, they clarify signaling and protein regulation; in neuroscience and physiology, they help explain excitability and contraction. Developmental and pharmacological research can likewise examine how calcium-regulated processes affect cell function and responses to intervention.
Abnormal calcium balance can interfere with the protein activities and physiological processes that depend on controlled ion levels. Because calcium signaling participates in contraction, secretion, excitability, and gene expression, disruption may affect several levels of cell function at once. Studying these disturbances helps connect altered calcium regulation with disease-related cellular outcomes.