Common steroids don't actually turn off inflammatory signals in the brain. they just disconnect the on switch from the machine.
April 24, 2026
Original Paper
Glucocorticoids decouple IL-6 trans-signalling-induced STAT3 activation from pro-inflammatory gene expression in endothelial cells
SSRN · 6572369
The Takeaway
Dexamethasone is one of the most widely used anti-inflammatory drugs in the world. It was assumed to work by blocking a signaling protein called STAT3 that tells cells to start an inflammatory response. In reality, the drug actually increases the activity of that protein but blocks the specific genes it usually controls. This creates a strange biological state where the fire alarm is ringing loudly but the sprinklers are disabled. Understanding this disconnect helps explain why steroids work so well for some conditions but fail for others.
From the abstract
Interleukin-6 (IL-6) is a central mediator of endothelial activation in inflammatory diseases. Synthetic glucocorticoids such as dexamethasone (Dex) are commonly used to treat vascular inflammation. Despite their clinical relevance, the molecular mechanisms underlying the crosstalk between IL-6 and glucocorticoid signalling in endothelial cells remain poorly defined.The interaction between glucocorticoids and IL-6-induced JAK/STAT signalling was analysed in human endothelial cells by examining s