Cytokine that have pyrogenic activity is:
**Core Concept**
Pyrogenic cytokines are a group of interleukins and other immune molecules that induce fever, a non-specific host response to infection or inflammation. These cytokines act on the hypothalamus, altering its temperature setpoint and leading to an increase in body temperature.
**Why the Correct Answer is Right**
The correct answer is Interleukin-1 beta (IL-1β). IL-1β is a potent pyrogenic cytokine that is produced by activated macrophages and other immune cells in response to the presence of pathogens or inflammatory stimuli. IL-1β acts on the hypothalamus to induce the production of prostaglandins, which in turn cause an increase in body temperature. This process is mediated by the IL-1 receptor, which is expressed on the surface of hypothalamic cells.
**Why Each Wrong Option is Incorrect**
**Option A:** TNF-alpha is a pro-inflammatory cytokine that is involved in the regulation of immune responses, but it is not the primary pyrogenic cytokine responsible for inducing fever. While TNF-alpha can contribute to the production of IL-1β, it is not the direct cause of pyrogenic activity.
**Option B:** Interleukin-6 (IL-6) is a cytokine that is involved in the regulation of immune responses and inflammation, but it is not a primary pyrogenic cytokine. IL-6 can contribute to the production of IL-1β, but it is not the direct cause of fever.
**Option C:** Interferon-gamma (IFN-γ) is a cytokine that is involved in the regulation of immune responses, particularly against viral infections. While IFN-γ can contribute to the production of IL-1β, it is not a primary pyrogenic cytokine.
**Clinical Pearl / High-Yield Fact**
The pyrogenic cytokines, including IL-1β, can be blocked by non-steroidal anti-inflammatory drugs (NSAIDs), which inhibit the production of prostaglandins and reduce fever. This is a key clinical application of NSAIDs in the treatment of fever and inflammation.
**Correct Answer:** C. Interleukin-1 beta (IL-1β)