Iodide Release
Iodide Release - Related Videos
09:09
Annexin V and Propidium Iodide Labeling
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2023
Staining with annexin V and propidium iodide (PI) provides researchers with a way to identify different types of cell death—either necrosis or apoptosis. This technique relies on two components. The first, annexin V, is a protein that binds certain phospholipids called phosphatidylserines, which normally occur only in the inner, cytoplasm-facing leaflet of a cell’s membrane, but become “flipped” to the outer leaflet during the early stages of apoptosis. The second component is the DNA-binding...
07:34
Modified Annexin V/Propidium Iodide Apoptosis Assay For Accurate Assessment of Cell Death
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Cited by 543 •
2011
An accurate method for the assessment of cell death is described. The protocol improves upon conventional Annexin V/ propidium iodide (PI) protocols, which display up to 40% false- positive events in cell lines and primary cells from a broad range of animal models.
04:31
Differential Nuclear Staining Assay: An Assay to Determine Mitocan Cytotoxicity by Propidium Iodide and Hoechst Double Staining
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2025
This video demonstrates a nuclear staining method to detect the cytotoxic effect of mitocan on drug-sensitive cancer cells and healthy variants. The double staining with DNA-binding dyes such as propidium iodide and Hoechst dye provides a clear distinction between the dead and live cells, thus helping to assess the cytotoxicity of the drug.
08:53
Assessment of Neuronal Viability Using Fluorescein Diacetate-Propidium Iodide Double Staining in Cerebellar Granule Neuron Culture
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Cited by 29 •
2017
This protocol describes how to accurately measure neuronal viability using Fluorescein diacetate (FDA) and Propidium Iodide (PI) double staining in cultured cerebellar granule neurons, a primary neuronal culture used as an in vitro model in neuroscience and neuropharmacology research.
01:28
Energy-releasing Steps of Glycolysis
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2019
Glycolysis is divided into two phases based on whether energy is utilized or released. While the first phase consumes ATP, the second phase produces energy in the form of ATP and NADH. The energy is released over a sequence of reactions that turns G3P into pyruvate. The energy-releasing phase—steps 6-10 of glycolysis—occurs twice, once for each of the two 3-carbon sugars produced during steps 1-5 of the first phase. The first energy-releasing step—the 6th step of glycolysis —consists of two...
FAQs
Deiodinases alter thyroid hormone molecules by breaking a carbon-iodine bond in thyroxine or triiodothyronine. This reaction does more than remove iodide: it produces metabolites with distinct biological effects. Consequently, the position and substrate involved in the reaction help determine whether thyroid hormone signaling is supported or reduced in a tissue.
The catalytic selenocysteine residue is the essential functional feature of iodothyronine deiodinases highlighted in this reaction. It enables the enzyme to act on the carbon-iodine bond of thyroid hormone substrates. Because this residue directly supports the bond-breaking step, changes in deiodinase function can influence hormone activation, inactivation, and iodine recycling.
T4 and T3 are distinct thyroid hormone substrates, so iodide release from either molecule can generate metabolites with different biological effects. The resulting products therefore matter for more than iodine recovery. Their formation helps explain how biochemical processing can shift the balance between thyroid hormone activity and reduced signaling within tissues.
Liberating iodide from iodine-containing thyroid hormone molecules creates a route for iodine recycling. This process links hormone metabolism with the availability and conservation of iodine, rather than treating hormone breakdown as an isolated event. Studying that connection is relevant when examining nutritional iodine status and biochemical responses associated with endocrine changes.
Research on iodide release helps clarify how tissues regulate thyroid hormone activation and inactivation through deiodinase-mediated metabolism. Comparing these biochemical outcomes can show how the same general hormone system produces different local effects. This perspective is useful for interpreting tissue responses when endocrine function changes or deiodinase activity becomes dysfunctional.
Investigations of iodide release can connect molecular reactions with broader questions about thyroid disorders, hormone signaling, nutritional iodine status, and deiodinase dysfunction. The biochemical outcome provides a way to examine how carbon-iodine bond cleavage affects hormone metabolites, iodine recycling, and the regulation of endocrine activity across relevant research settings.