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Ch. 21 The Immune System: Innate and Adaptive Body Defenses
Marieb - Human Anatomy & Physiology 7th Edition
Marieb, Hoehn7th EditionHuman Anatomy & PhysiologyISBN: 9780805359091Not the one you use?Change textbook
All textbooksMarieb, Hoehn 7th EditionCh. 21 The Immune System: Innate and Adaptive Body DefensesProblem 15
Chapter 20, Problem 15

Interferons are referred to as antiviral proteins. What stimulates their production, and how do they protect uninfected cells? Which cells of the body secrete interferons?

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Understand that interferons are proteins produced by cells in response to viral infections; their production is stimulated when a cell detects the presence of viral components, such as viral RNA or DNA, inside it.
Recognize that once produced, interferons are secreted and bind to receptors on neighboring uninfected cells, triggering these cells to produce antiviral proteins that inhibit viral replication, thereby protecting them from infection.
Identify that interferons do not directly kill viruses but instead activate cellular mechanisms that interfere with viral replication and enhance the immune response.
Know that various cells can secrete interferons, including virus-infected cells themselves, as well as immune cells such as macrophages, dendritic cells, and lymphocytes.
Summarize that interferons act as signaling molecules alerting nearby cells to the viral threat, enabling a rapid and coordinated antiviral defense across tissues.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Stimuli for Interferon Production

Interferons are produced in response to viral infections. When a cell detects viral components like double-stranded RNA, it triggers the synthesis and release of interferons to alert neighboring cells and initiate an antiviral state.
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Interferons

Mechanism of Interferon Protection

Interferons protect uninfected cells by binding to their surface receptors, activating signaling pathways that induce the expression of antiviral proteins. These proteins inhibit viral replication and enhance immune responses, preventing the spread of infection.
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Cells that Secrete Interferons

Various cells secrete interferons, primarily virus-infected cells, as well as immune cells like macrophages, dendritic cells, and lymphocytes. These cells produce different types of interferons (Type I, II, III) to coordinate the antiviral defense.
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