We speculate that the activation of C/EBPβ/AEP signaling might serve as a plausible mechanism underlying the detrimental effects of SCFAs, as demonstrated in GF 3xTg-AD mice.196 A recent study found that the C/EBPβ/AEP signaling is age-dependently activated in human α-synuclein transgenic mice and PD patients, which is responsible for mediating microglial activation and PD pathologies.334. This evidence concerns the gene CEBPB and Alzheimer disease.