Cytokines are chemical messengers, which

JIPMER Nursing Officer-2017

Applied Physiology

Easy

Appeared in: JIPMER Nursing Officer-2017

Explanation

Cytokines are small signaling proteins released by cells, especially immune cells, to communicate with other cells.
A primary function of many cytokines, such as Interleukin-1 (IL-1), IL-6, and Tumor Necrosis Factor-alpha (TNF-α), is to initiate and regulate inflammation.
These pro-inflammatory cytokines orchestrate the inflammatory response by increasing blood vessel permeability and recruiting other immune cells to the site of infection or injury.
This process is a fundamental part of the body's innate immune response to pathogens and tissue damage.

Why Other Options Were Wrong

Option A: Cytokines do not directly kill pathogens. They function as messengers that signal and activate effector cells, like macrophages and cytotoxic T-cells, to carry out the killing.
Option C: Pain is an indirect consequence of the inflammation and swelling that cytokines help to create. Other molecules released during this process, like bradykinin and prostaglandins, are more directly responsible for stimulating pain receptors.
Option D: Antibodies are complex proteins produced exclusively by plasma cells (which are fully differentiated B-lymphocytes). Cytokines regulate this process by helping to activate B-cells, but they do not synthesize antibodies themselves.

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Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Function of cytokines in the immune system as background academic context rather than a clinical decision trigger.
Understanding cytokines is crucial for managing autoimmune diseases like rheumatoid arthritis and psoriasis, where anti-cytokine therapies (e.g., TNF inhibitors) are used to block their inflammatory effects.
A 'cytokine storm,' an excessive and uncontrolled release of pro-inflammatory cytokines, is a life-threatening complication seen in severe infections like sepsis and COVID-19, leading to widespread inflammation and multi-organ failure.
What if? - If a patient is receiving a drug that blocks cytokine action (like a JAK inhibitor for arthritis), their inflammatory response is suppressed. A key nursing role is to monitor this patient for signs of infection, as their body's ability to fight it is weakened.

How to Approach the Question

First, identify the core subject of the question: 'cytokines' and their role as 'chemical messengers'.
This is a factual recall question that tests your understanding of basic immunology.
Think about the primary role of a messenger: to send signals and coordinate a response, not necessarily to perform the final action itself.
Evaluate each option based on this 'messenger' concept. Do cytokines directly kill, cause pain, or produce antibodies? Or do they signal other cells to perform these actions or initiate a process?
Recall that inflammation is a complex process coordinated by many signals. Cytokines are the key coordinators.
This leads to the conclusion that their most accurate function among the choices is to promote inflammation.

Concept Tested & Keywords

Concept Tested: Function of cytokines in the immune system
Stem keywords: Cytokines, chemical messengers
Lead-in keywords: BEST, MOST RELEVANT CLUE
Negative lead-in flag: false

Question ID

QFk2dxI7AvQ8AFf1Rxrdsh

Reference Book

E6 Robert Boland, Marcia L. Verduin - Kaplan and Sadock's Comprehensive Text of Psychiatry-Wolters Kluwer Health (2024) (pp 1-16525 of 16525) p. 690-692

E6 Pathology-Textbook of PATHOLOGYHarsh Mohan Part 1 (1-214) p. 101-103

E6 Medicine Harrison 22e Part 2 p. 677-679

Explanation

Why Other Options Were Wrong

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