In severe acute pancreatitis, which cytokine is a key mediator of the systemic inflammatory response?

In severe acute pancreatitis, which cytokine is a key mediator of the systemic inflammatory response?

• A. IL-1
• B. TNF-α
• C. IL-6
• D. IFN-γ

Answer: (B)

When severe acute pancreatitis triggers systemic inflammatory response, it’s driven by rapid release of proinflammatory cytokines from activated immune cells in the pancreas and peritoneum. Among these, tumor necrosis factor alpha is the central early mediator. It drives many of the hallmark SIRS effects by activating endothelium, increasing vascular permeability, and promoting leukocyte recruitment, which together amplify the inflammatory response. TNF-α also triggers the production of other cytokines, setting off a cascade that leads to fever, hypotension, and potential organ dysfunction. While IL-1 and IL-6 contribute to the ongoing systemic inflammation—IL-6 mainly mediating the acute-phase response and fever, and IL-1 acting as another proinflammatory signal—the initial and pivotal driver in this scenario is TNF-α. IFN-γ is more associated with Th1-type immune responses and macrophage activation in different contexts, not the brisk early cytokine surge characteristic of pancreatitis-related SIRS.

When severe acute pancreatitis triggers systemic inflammatory response, it’s driven by rapid release of proinflammatory cytokines from activated immune cells in the pancreas and peritoneum. Among these, tumor necrosis factor alpha is the central early mediator. It drives many of the hallmark SIRS effects by activating endothelium, increasing vascular permeability, and promoting leukocyte recruitment, which together amplify the inflammatory response. TNF-α also triggers the production of other cytokines, setting off a cascade that leads to fever, hypotension, and potential organ dysfunction. While IL-1 and IL-6 contribute to the ongoing systemic inflammation—IL-6 mainly mediating the acute-phase response and fever, and IL-1 acting as another proinflammatory signal—the initial and pivotal driver in this scenario is TNF-α. IFN-γ is more associated with Th1-type immune responses and macrophage activation in different contexts, not the brisk early cytokine surge characteristic of pancreatitis-related SIRS.