Maximus Gage
Osmium tetroxide is a dye and fixative that is commonly used in histology laboratories. It is used to stain myelin sheaths black and is particularly effective at revealing the details of myelin in nerves. Osmium tetroxide is also used to visualize and quantify bone marrow adipose tissue in vivo. It is important to note that osmium tetroxide is an unpleasant and toxic chemical that can cause severe burns to the eyes and skin, as well as irritation to the respiratory and gastrointestinal tract. When working with osmium tetroxide, it is crucial to follow safety protocols, such as using a fume hood to prevent inhalation of toxic fumes. While osmium tetroxide is known to stain myelin sheaths and bone marrow adipose tissue, its effectiveness in staining muscle fibers specifically is not explicitly mentioned in the sources provided. However, there is a reference to its affinity for sensory endings of snake muscle spindles when combined with zinc iodide.
| Characteristics | Values |
|---|---|
| Type of Stain | Osmium Tetroxide |
| Other Names | OsO4, Osmic Acid, Osmium Tetraoxide |
| Uses | Used as a dye and a fixative, especially in electron microscopy |
| Effect on Muscle Fibers | Used to stain myelin sheaths black, does not stain non-myelinated fibers |
| Other Uses | Used to visualize bone marrow adipose tissue, to stain peripheral nerves, and to study sensory endings of snake muscle spindles |
| Safety | Toxic and unpleasant, can cause headaches, eye and skin burns, and irritation of respiratory and gastrointestinal tract |
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What You'll Learn
Osmium tetroxide stains myelin sheaths black
Osmium tetroxide (OsO4) is a dye and a fixative. It is used as a fixative agent in electron microscopy, which has a high electron scattering rate without the need for coating the membrane with a layer of metal, which can obscure details of the cell membrane. It is well-suited to reveal the details of myelin in nerves because it binds to lipids strongly.
Osmium tetroxide is used to stain myelin sheaths black. It was first introduced by Palade in 1952 for his classic work identifying the structure and function of cell organelles using the electron microscope. Osmium tetroxide is one of the oldest fat stains and is soluble in fats. It forms a black reduction compound with them by the addition to the double carbon-to-carbon bonds.
In peripheral nerves' anatomical studies, the visualization of the myelin sheaths is the primary goal and a gold standard in this area of research. Osmium tetroxide staining enables the observation of these structures. This particular stain was uncovered during the primary nerve study method. Resin-embedded samples were treated with toluidine blue, revealing most of the fibers coated in myelin.
Osmium tetroxide staining has been used in studies involving photo-biomodulation therapy (PBMT), which is a physiotherapy technique that uses low-intensity light to promote healing in damaged tissues, such as nerves. In one study, PBMT was administered to the injured median nerve of Wistar rats. Following the procedure, nerve and muscle samples were collected and analyzed through histological examination. It was found that PBMT-treated samples exhibited a higher number and diameter of fibers and thicker myelin sheaths than the injured group.
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Osmium staining provides a high-resolution map of bone marrow adipose tissue
Osmium tetroxide (OsO4) is both a dye and a fixative. It is a well-suited dye to reveal the details of myelin in nerves because it binds to lipids strongly. It has been used for this purpose for a long time, with the first publication reporting the use of OsO4 dating back to 1865. When it reacts with the double bonds of lipids, metallic osmium is deposited in the tissue, giving it a black colour.
Osmium staining is used to visualise and quantify bone marrow adipose tissue (MAT) or marrow fat. MAT has long been known to be present in bone marrow, but its origin, development, and function remain largely unknown. Clinically, increased MAT is associated with age, metabolic diseases, drug treatment, and marrow recovery in children receiving radiation and chemotherapy.
Conventional quantitation of MAT relies on sectioning of the bone to overcome issues with distribution but is time-consuming, resource-intensive, inconsistent between laboratories, and may be unreliable as it may miss changes in MAT volume. This has hampered a full understanding of MAT's development and function.
A new technique that couples histochemical staining of lipid using osmium tetroxide with microcomputerized tomography has been developed to visualise and quantitate MAT within the medullary canal in three dimensions. Imaging of osmium staining provides a high-resolution map of existing and developing MAT in the bone marrow. This method is simple, reproducible, and quantitative, and is expected to become a useful tool for the precise characterisation of MAT.
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Osmium tetroxide is a dye and a fixative
Osmium tetroxide (OsO4) is both a dye and a fixative. It is primarily used as a fixative agent in electron microscopy, as it has a high electron scattering rate without the need for coating the membrane with a layer of metal, which can obscure details of the cell membrane. It is well-suited for revealing the details of myelin in nerves because it binds to lipids strongly.
Osmium tetroxide is used to stain myelin sheaths black. The myelinated fibers appear as circular profiles (or bubbles) with the central non-staining area occupied by the axon. Non-myelinated fibers are not visible. Osmium tetroxide is one of the oldest fat stains, and it is soluble in fats, forming a black reduction compound with them by adding to the double carbon-to-carbon bonds.
Osmium tetroxide is also used to stain lipids in frozen sections. It is the only fixing agent that can completely and easily fix fats, although it is also valuable for fixing lipid membranes and structures such as mitochondria. It is commonly used in peripheral nerves' anatomical studies, where visualization of the myelin sheaths is the primary goal and a gold standard in this area of research.
Osmium tetroxide is toxic and expensive, so it is usually only used when other fixing agents are not suitable. It is important to note that osmium tetroxide must be used in a fume hood, as it emits toxic fumes, and care must be taken to ensure that the fumes are not inhaled.
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Osmium tetroxide stains peripheral nerves
Osmium tetroxide (OsO4) is both a dye and a fixative. It is a highly oxidative compound that interacts with the double bonds of lipids, resulting in a reduction that produces osmium black. This compound is then deposited in lipid-rich structures, including the myelin coatings of nerves, causing them to be stained black.
Osmium tetroxide is well-suited for revealing the details of myelin in nerves because it binds to lipids strongly. In the staining of the plasma membrane, osmium tetroxide binds to phospholipid head regions, creating contrast with the neighbouring cytoplasm. Myelinated nerve fibres, in particular, react strongly to osmium tetroxide and appear as circular profiles with the central non-staining area occupied by the axon.
In peripheral nerve anatomical studies, the visualisation of myelin sheaths is a primary goal and gold standard. Osmium tetroxide staining enables the observation of these structures, providing high-quality results. However, it has some disadvantages, including higher costs, lower time efficiency, and limitations in immunohistochemical staining due to the complexity of the antigen retrieval method.
Osmium tetroxide staining has been used in various studies, including those examining peripheral nerve regeneration and the therapeutic impact on peripheral nerves. For example, in one study, photo-biomodulation therapy (PBMT) was administered to the injured median nerve of Wistar rats. Following the procedure, nerve and muscle samples were collected and analysed through histological examination. It was found that the PBMT-treated samples exhibited a higher number and diameter of fibres and thicker myelin sheaths than the injured group.
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Zinc iodide-osmium stain has an affinity for sensory endings of snake muscle spindles
Osmium tetroxide (OsO4) is a dye and fixative that is used in electron microscopy to reveal the details of myelin in nerves. It binds to lipids, creating a contrast with the neighbouring cytoplasm. It is particularly effective at staining myelinated nerve fibres, which react strongly to osmium tetroxide, turning black.
The zinc iodide-osmium tetroxide (ZIO) method is a technique that combines osmium tetroxide with zinc iodide and glutaraldehyde perfusion and fixation. This method has been used to study the synaptic vesicles in cephalopod nerves, specifically in the giant fibre system of *Loligo vulgaris* and the optic lobe of *Octopus vulgaris*.
The ZIO method has been modified to include glutaraldehyde perfusion and fixation prior to the reaction, which has resulted in better preservation of the structure in the aforementioned cephalopod nerves. The ZIO method can discriminate between vesicles that are clear and of the same shape and size in normal electron microscopy.
In smooth muscle preparations, the ZIO method has been used to detect Ca2+-affinity subcellular sites. The zinc osmate formed during the ZIO reaction has a high affinity for Ca2+ binding sites, and can therefore be useful in revealing some Ca2+ storage sites in cells.
Therefore, the zinc iodide-osmium stain has an affinity for sensory endings of snake muscle spindles, and can be used to detect Ca2+-affinity subcellular sites in tonic smooth muscle.
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Frequently asked questions
Osmium tetroxide (OsO4) is both a dye and a fixative. It is used to reveal the details of myelin in nerves because it binds to lipids strongly.
Osmium tetroxide binds phospholipid head regions, thus creating contrast with the neighbouring cytoplasm. It is reduced and metallic osmium is deposited in the tissue when it reacts with the double bonds of lipids. This gives the tissue a black colour.
Osmium tetroxide stains myelin sheaths black. It is also used to stain bone marrow adipose tissue and heart muscle tissue.
Osmium tetroxide is purchased sealed into glass vials containing one gram. The vial is scored and broken open, and the osmium tetroxide is dissolved in water to make the desired concentration. It is important to note that osmium tetroxide produces toxic fumes and should be handled with care.
Yes, osmium tetroxide has been used to stain heart muscle tissue and the sensory endings of snake muscle spindles.
