Allergic Reactions
Allergic Reactions - Related Videos
02:06
Allergic Reactions
0 Views •
2019
Overview We speak of an allergy when the immune system triggers a response against a benign foreign structure, like food, pollen or pet dander. These elicitors are called allergens. If the immune system of a hypersensitive individual was primed against a specific allergen, it will trigger allergic symptoms during every subsequent encounter of the allergen. Symptoms can be mild, such as hay fever, to severe, such as potentially fatal anaphylactic shock. Sensitization Is the First Step of an...
01:27
Allergic Drug Reactions
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2023
Allergic reactions related to drugs are hypersensitivity responses driven by the immune system and bear no connection to the drug's therapeutic action. While drugs in isolation do not trigger an immune response, they can interact with endogenous proteins to form antigens. These antigens stimulate lymphocytes to produce antibodies. IgE-type antibodies attach themselves to mast cells. Upon subsequent exposure to the same stimulus, the antigen-antibody interaction is initiated, unleashing numerous...
01:30
Allergic Reactions: Anaphylaxis
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2026
Anaphylaxis is a severe, life-threatening hypersensitivity reaction mediated by Immunoglobulin E (IgE) antibodies. When IgE binds to allergens, it triggers the release of mediators– histamine, leukotrienes, and prostaglandins from mast cells and basophils. These mediators cause vasodilation, edema, and inflammation, leading to various symptoms.The primary allergens causing anaphylaxis include food items (e.g., peanuts, shellfish), drugs (e.g., penicillin, asparaginase, corticotropin, heparin),...
01:30
Drug Toxicity: Allergic Reactions
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2026
Drug-related allergies are immune-mediated responses triggered by the administration of pharmacological agents. These hypersensitivity reactions are classified based on the immune mechanisms involved. The four primary types—Type I, II, III, and IV—are mediated by different immunological pathways and exhibit distinct clinical manifestations.Type I Hypersensitivity/ IgE-Mediated Reactions: Immunoglobulin E (IgE) immediately mediates Type I hypersensitivity reactions. Upon initial exposure to a...
07:01
Zebrafish Animal Model for the Study of Allergic Reactions in Response to Tick Saliva Biomolecules
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Cited by 4 •
2022
Here, zebrafish (Danio rerio) is used as a model to study allergic reactions and immune responses related to alpha-Gal syndrome (AGS) by evaluating allergic reactions to tick saliva and mammalian meat consumption.
FAQs
The immediate pathway begins when allergen-specific immunoglobulin E, or IgE, binds to mast cells and basophils. Contact with the relevant allergen then triggers these cells to release histamine and other inflammatory mediators. Their activity produces effects such as itching, swelling, airway narrowing, and blood-pressure changes, giving pharmacologists specific mechanisms to target with treatment.
The severity depends on how inflammatory mediator release affects the body. Effects limited to irritation or itching are less dangerous than changes involving airway narrowing or blood pressure. This range matters in pharmacology because the same underlying immune process can produce outcomes requiring very different levels of therapeutic support, from reducing histamine effects to rapidly supporting breathing and circulation.
These agents address different pharmacological needs. Antihistamines reduce the effects of histamine, while corticosteroids limit inflammation more broadly. Epinephrine is used during anaphylaxis to rapidly support breathing and circulation. Their distinct actions reflect the fact that allergic reactions involve both mediator-driven symptoms and potentially dangerous changes in respiratory and cardiovascular function.
Management is linked to the seriousness of the observed effects. Antihistamines can target histamine-related manifestations, and corticosteroids can limit inflammation. When anaphylaxis threatens breathing or circulation, epinephrine provides rapid support for those functions. This severity-based perspective helps connect the clinical presentation with the pharmacological action most relevant to the immediate problem.
Medications can be among the substances that trigger an allergic response, so pharmacology must consider both therapeutic effects and unwanted immune reactions. Understanding IgE, mast cells, basophils, histamine, and inflammatory mediators helps explain how drug-related reactions arise. This knowledge supports safer drug use and informs the development of treatments intended to control allergic responses.
Itching and swelling indicate inflammatory effects, whereas airway narrowing and changes in blood pressure signal involvement of functions that can make the reaction far more severe. Considering these manifestations together helps relate observed outcomes to mediator activity and supports a pharmacological assessment of whether treatment should focus on reducing histamine effects, limiting inflammation, or rapidly supporting breathing and circulation.