How your body uses chemical signals to fight injury and infection
In short: When you are injured, your body initiates a complex, organized defense mechanism. This process, known as inflammation, relies on a sophisticated chain of cellular and vascular events to prevent further tissue damage and restore function. Understanding these hidden chemical messengers is key to understanding how we heal.
The term inflammation originates from the Latin word 'inflammare', meaning to burn. This biological response is a central defense mechanism used by animal cells to protect against microbial infections and physical injuries. The process is generally categorized into two distinct phases: acute and chronic. While acute inflammation is a rapid response to immediate threats, chronic inflammation is a more persistent state linked to serious conditions such as cancer, cardiovascular diseases, and neurodegenerative disorders.
The acute phase begins with vascular events that occur within minutes of an injury. This involves changes in the microvasculature, specifically vasodilation and increased vessel permeability. As vessels become more permeable, fluid and inflammatory mediators enter the area, often resulting in interstitial edema. Simultaneously, a process called leukocyte infiltration occurs, where white blood cells move from the circulatory system into the affected tissue. Neutrophils are typically the first inflammatory cells recruited to the site of acute inflammation.
This defense is orchestrated by various 'inflammatory cells,' including macrophages, lymphocytes, neutrophils, monocytes, basophils, and eosinophils. These cells release specialized mediators to drive the response. These substances include vasoactive amines, peptides, eicosanoids, and proinflammatory cytokines. Specific signaling molecules like histamine, prostaglandins, leukotrienes, and serotonin, along with nitrogen- and oxygen-derived free radicals, play crucial roles. Chemotactic agents, such as interleukins and the C5a complement fragment, further stimulate the intense infiltration of leukocytes to ensure the body can effectively combat the initial insult.
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Sources
- Summary by Intellect · source: Inflammatory mediators and the inflammatory response
- Also: The crucial roles of inflammatory mediators in inflammation: A review
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