AChE is an acetylcholine hydrolyzing enzyme that is responsible for the termination of cholinergic response [ 63].
While PFT-induced osmotic stress has been linked to activation of MAPK signaling, the mechanisms involved in termination of this response are less clear.
This gives rise to the initiation and then termination of that response.
The free RK may then phosphorylate R*, leading to the deactivation of R* by arrestin (Arr) and the termination of the response.
Those requirements are reflected in the constraints on the parameter values for faithful responses, i.e. a low binding rate of TGF- β to its receptor and a low phosphorylation rate prevent early saturation of the output, while a relative weak feedback and a low binding rate of the I-Smad to the receptor prevent a premature termination of the response.
However, when an Or from the silk moth Bombyx mori was expressed in Drosophila T1 sensilla, termination of the response was rapid, whereas it was delayed when this receptor was expressed in another type of sensilla than the T1s, suggesting that the cellular environment of Ors could also play a role in the dynamics of the response [ 4].
Importantly, fibroblasts seem to be responsible for the termination of immune responses, or alternatively, for the switch from acute to chronic inflammation [ 2, 3].
Hemophagocytic disorders result when critical regulatory pathways responsible for the natural termination of immune/inflammatory responses are disrupted or overwhelmed.
Genetic HPS is heterogeneous and arises from defects in the critical regulatory pathways responsible for the natural termination of immune responses that lead to the failure of the homeostatic removal of cells that are superfluous or dangerous to the host.
Inadequate termination of these responses could lead to autoimmunity, chronic inflammation and cancer.
Treg play a central role in inducing and maintaining immunologic tolerance and the termination of immune responses.
