The aim of this mini-review is to give an update on the current develo
pments concerning the IL-1 plasma membrane receptor complex and the mo
des of signal transduction through the plasma membrane. The mechanisms
of signal generation at the cytosolic side of the plasma membrane wil
l be summarized. Possible coupling mechanisms to down-stream signallin
g elements will be discussed, which result in the complex activation o
f transcription factors responsible for the cellular responses to IL-1
. It is not the aim of this review to extensively summarize IL-1 induc
ed cytosolic kinase cascades and activation of transcription factors.