Logan Steele
Muscle tissue is eosinophilic. Eosinophilic structures are those that absorb the staining dye eosin, which is used to stain cell cytoplasm, collagen, and muscle fibres. Eosin is usually combined with a stain called hematoxylin to produce a hematoxylin- and eosin-stained section (H&E stain), which is the most widely used histological stain for a medical diagnosis. Basophils and eosinophils are both types of white blood cells, with basophils being the largest and least common type. They play a crucial role in protecting the body from infections and allergens.
| Characteristics | Values |
|---|---|
| Muscle tissue | Eosinophilic |
| Eosinophilic structures | Composed of protein |
| Eosin | An acidic dye for staining cell cytoplasm, collagen, and muscle fibers |
| Basophilic cells | Contain a lot of acids |
| Eosinophilic cells | Absorb more eosin dye than haematoxylin |
| Eosinophilic cells | Observed in histological sections in light pink colour |
| Basophils | White blood cells that help your body fend off allergens |
| Basophils | Largest white blood cell compared to neutrophils and eosinophils |
| Basophils | Make up less than 1% of all white blood cells |
| Eosinophils | Promote Trichinella spiralis (Ts) infection |
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What You'll Learn
Muscle tissue is eosinophilic
Eosin is an acidic dye used for staining cell cytoplasm, collagen, and muscle fibres. Structures that absorb the dye eosin are called eosinophilic structures, and they are generally composed of protein. Muscle tissue is eosinophilic, and this can be seen in muscle biopsies.
Eosinophilic myositis is a condition characterised by the infiltration of skeletal muscle tissue by eosinophils, which are a type of white blood cell. This condition can be attributed to specific causes, such as parasitic infections, connective tissue disorders, hematologic and non-hematologic malignancies, drugs, and toxic substances. However, in some cases, it may be diagnosed as idiopathic eosinophilic myositis, indicating that the exact cause is unknown.
The diagnosis of eosinophilic myositis is made through muscle biopsy, where the presence of eosinophils in the skeletal muscle tissue is identified. This is a crucial step in distinguishing eosinophilic myositis from other similar conditions, such as polymyositis or dermatomyositis. The number and location of eosinophils in the muscle tissue can vary, and they may be found endomysially, intra-vascularly, or perivascularly.
There are several subtypes of eosinophilic myositis, including focal eosinophilic myositis, eosinophilic polymyositis, and eosinophilic perimyositis. Focal eosinophilic myositis is considered a benign and isolated condition, typically affecting the lower legs and causing proximal weakness. On the other hand, eosinophilic polymyositis can be associated with muscular dystrophy or be a feature of multiorgan hypereosinophilic syndrome.
The treatment of eosinophilic myositis aims to prevent scarring, tissue loss, and contractures. Early intervention is crucial for optimal outcomes. Immunosuppressants and corticosteroids are commonly used in combination to manage the condition and prevent infections. Physical therapy may also be beneficial in reducing and preventing contractures.
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Eosinophilic structures are composed of protein
Eosin is an acidic dye used for staining cell cytoplasm, collagen, and muscle fibres. Eosinophilic structures are those that absorb this dye, and they are, in general, composed of protein.
Eosinophils contain a large amount of eosinophil cationic protein (ECP), which is a marker for eosinophilic disease and can be quantified in biological fluids. ECP has the ability to degrade RNA and plays a role in fighting viral infections. Eosinophils also contain cationic granule proteins, which are released by degranulation. These include reactive oxygen species such as hypobromite, superoxide, and peroxide, and lipid mediators like eicosanoids from the leukotriene family.
Eosinophils are activated by an immune stimulus, after which they release an array of cytotoxic granule cationic proteins that can induce tissue damage and dysfunction. These include major basic protein, eosinophil peroxidase, and eosinophil cationic protein, which are toxic to many tissues. Eosinophil cationic protein creates toxic pores in the membranes of target cells, allowing potential entry for other cytotoxic molecules. It can also inhibit the proliferation of T cells, suppress antibody production by B cells, induce degranulation by mast cells, and stimulate fibroblast cells to secrete mucus and glycosaminoglycans.
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Eosin is an acidic dye
Eosin is a fluorescent, xanthene dye with a reddish hue formed by the action of bromine and fluorescein. It is used to stain salts with eosinophilic compounds containing positive charges. Eosin is an artificial product of fluorescein and a class of fluorescent red dye. It is also used as a red dye in inks, although the molecules tend to degrade over time, leaving behind their bromine atoms and causing the colour to darken.
Eosin is named after the nickname (Eos) of its inventor Heinrich Caro's childhood friend, Anna Peters. It was commercialized in 1874, mainly for the textile industry. Eosin is an acidic dye used for staining cell cytoplasm, collagen, and muscle fibres. It is the most widely used histological stain for medical diagnosis. When examining a suspected cancer biopsy, pathologists stain it with eosin and hematoxylin, a basic dye that stains structures that are acidic in nature.
Eosinophilic structures, such as collagen, are generally composed of protein and absorb more eosin than hematoxylin, resulting in a light pink colour. Eosin is used in combination with other dyes such as haematoxylin and methylene blue for different histological purposes. The choice between Eosin B and Eosin Y is driven by preference and tradition, as each dye can be used interchangeably.
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Basophilic cells contain a lot of acid
The terms "basophilic" and "eosinophilic" are used to describe the appearance of cells and structures observed in histological sections. These terms relate to the staining of cells, which is a common practice in histology to aid in the identification and analysis of specific cell types and structures.
Basophilic cells are those that exhibit an affinity for basic dyes, such as haematoxylin. These cells are often referred to as "base-loving" cells. When stained with haematoxylin, basophilic cells will appear purple to black, with their granules appearing as tiny purple dots. This staining technique is commonly used to visualize and identify specific cell types, such as basophils, which are a type of white blood cell. Basophils play a crucial role in the immune system, protecting the body from infections, allergens, and parasites.
On the other hand, eosinophilic cells, also known as acidophilic cells, preferentially absorb acidic dyes like eosin. Eosin is a commonly used stain for cell cytoplasm, collagen, and muscle fibers. When stained with eosin, these structures exhibit a light pink colour. Eosinophilic structures are generally composed of protein and are often observed in medical diagnoses, particularly in the examination of suspected cancer biopsies.
The staining behaviour of cells is due to the chemical nature of the dyes and the cellular components. Basophilic cells are rich in acidic components, such as DNA and RNA, which are weakly acidic due to the presence of negatively charged nucleic acids. These acidic components attract basic dyes like haematoxylin, which has a positive charge. Conversely, eosinophilic cells contain basic components that attract acidic dyes like eosin.
It is important to note that while the staining behaviour provides valuable information for cell identification and analysis, the exact mechanisms behind the staining affinity of certain cells are not yet fully understood. Further research in histology is ongoing to enhance our understanding of these processes.
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Eosinophils promote skin tissue repair
Eosin is an acidic dye used for staining cell cytoplasm, collagen, and muscle fibres. Eosinophilic structures are those that absorb the eosin stain and are, in general, composed of protein. Eosin is often combined with a stain called hematoxylin to produce a hematoxylin- and eosin-stained section (H&E stain), which is the most widely used histological stain for medical diagnosis.
Eosinophilic skin diseases, commonly termed eosinophilic dermatoses, refer to a broad spectrum of skin diseases characterised by eosinophil infiltration and/or degranulation in skin lesions, with or without blood eosinophilia. Eosinophil infiltration of the skin is a frequent finding in a wide range of dermatological disorders, despite the skin not typically harbouring eosinophils under normal physiological conditions.
Eosinophils are typically associated with unique inflammatory settings, including allergic inflammation and helminth infections. However, new information suggests that eosinophils contribute more broadly to inflammatory responses and participate in local immune regulation and tissue remodelling/repair events linked with a variety of diseases. For example, eosinophils are necessary for IgE autoantibody-mediated blister formation in bullous pemphigoid (BP), a subepidermal autoimmune blistering disease. The disease severity is IgE dose-dependent and correlates with the degree of eosinophil infiltration in the skin.
Eosinophilic dermatoses can affect specific tissue layers or adnexal structures of the skin, such as the dermis, subcutaneous fat, fascia, follicles, and cutaneous vessels. Some examples of eosinophilic dermatoses include eosinophilic cellulitis, granuloma faciale, eosinophilic pustular folliculitis, recurrent cutaneous eosinophilic vasculitis, and eosinophilic fasciitis.
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Frequently asked questions
Basophils are white blood cells that help your body fight off infections and allergens. They are the largest type of white blood cell and make up less than 1% of all white blood cells.
Eosinophils are white blood cells that help protect the body from parasites and promote tissue repair. They are typically found in peripheral blood and are larger in number compared to basophils.
Muscle tissue is eosinophilic. Eosinophilic structures are composed of protein, such as collagen and muscle fibres.
