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相关概念视频

Allergic Reactions02:06

Allergic Reactions

Overview
Allergic Drug Reactions01:27

Allergic Drug Reactions

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...
Allergic Reactions: Anaphylaxis01:30

Allergic Reactions: Anaphylaxis

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),...
Hypersensitivities01:30

Hypersensitivities

Hypersensitivity, also known as a hypersensitivity reaction or allergic reaction, is a condition where the body's immune system reacts abnormally to a foreign substance. Such substances, that cause hypersensitivity are referred to as an allergen, could be something typically harmless to most people, like pollen or certain foods.
Types of Hypersensitivities
Hypersensitivity reactions are categorized into four types: Type 1, Type 2, Type 3, and Type 4. Each type has a distinct mechanism...
Antigens Involved in Adaptive Immunity01:26

Antigens Involved in Adaptive Immunity

An antigen is any substance the immune system identifies as foreign and potentially harmful to the body, prompting an immune response. Antigens have two functional properties: immunogenicity and reactivity. Immunogenicity is the ability of an antigen to stimulate a specific immune response. At the same time, reactivity describes the antigen's ability to react with the cells and antibodies produced in response to it.
Complete Antigens
Complete antigens possess both immunogenicity and reactivity.
Cell-mediated Immune Responses01:40

Cell-mediated Immune Responses

Overview

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相关实验视频

Updated: May 22, 2026

Absorption of Nasal and Bronchial Fluids: Precision Sampling of the Human Respiratory Mucosa and Laboratory Processing of Samples
11:54

Absorption of Nasal and Bronchial Fluids: Precision Sampling of the Human Respiratory Mucosa and Laboratory Processing of Samples

Published on: January 21, 2018

过敏宿主防御系统的过敏性

Noah W Palm1, Rachel K Rosenstein, Ruslan Medzhitov

  • 1Howard Hughes Medical Institute, Department of Immunobiology, Yale University School of Medicine, New Haven, Connecticut 06510, USA.

Nature
|April 28, 2012
PubMed
概括
此摘要是机器生成的。

通常被认为有害的过敏反应实际上可能是对环境毒素和刺激物有益的免疫防御. 这种免疫过敏可能会演变为促进避免有害物质和环境.

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科学领域:

  • 免疫学 免疫学 免疫学
  • 环境健康 环境健康

背景情况:

  • 过敏通常被视为对寄生虫的有害免疫反应.
  • 过敏反应的进化目的仍然不完全理解.

研究的目的:

  • 提出一种关于过敏免疫的进化作用的新视角.
  • 探索过敏反应在宿主防御中的潜在益处.

主要方法:

  • 审查和综合现有的免疫学和进化数据.
  • 对过敏反应的功能进行论证分析.

主要成果:

  • 过敏免疫可以作为对有害环境物质 (如毒素和刺激物质) 的防御机制.
  • 适当向的过敏反应可能是有益的,而过度反应是有害的.

结论:

  • 过敏过敏症可能已经演变为促进预期反应和避免次优环境.
  • 这种观点将过敏重新定义为不仅是一种疾病,而且是一种潜在的适应性免疫功能.