Following a traumatic injury, why does persistent, elevated signaling by the cytokine TNF-α increase the risk of chronic inflammation in affected tissues?

💡 Explanation

Persistent TNF-α signaling leads to chronic inflammation because it causes sustained activation of the transcription factor NF-κB, which promotes continued expression of pro-inflammatory genes. Therefore, NF-κB activation maintains inflammation, rather than a resolution phase, because anti-inflammatory pathways are not effectively upregulated to counteract this effect.

• If a patient experiences a sudden increase in blood viscosity due to dehydration, which consequence follows regarding cardiovascular hemodynamics?
• Why does Cushing's syndrome, characterized by excessive cortisol, sometimes arise from pituitary tumors that secrete ACTH, rather than directly from adrenal gland malfunctions?
• A patient exhibits resistance to insulin due to prolonged elevated levels. What distinguishes the downstream signaling in cells exposed to excessive insulin from cells with normal insulin sensitivity?
• Why does sustained hypertension typically lead to increased fluid filtration into tissues and peripheral edema?
• Which outcome reduces elbow range of motion post-fracture?
• What distinguishes the liver's role in gluconeogenesis from that of skeletal muscle during prolonged fasting?