TLR5 decoy receptor as a novel anti-amyloid therapeutic for Alzheimers disease
There is considerable interest in harnessing innate immunity to treat Alzheimer’s disease (AD). Here, we explore whether a decoy receptor strategy using the ectodomain of select TLRs has therapeutic potential in AD. AAV-mediated expression of human TLR5 ectodomain (sTLR5) alone or fused to human IgG4 Fc (sTLR5Fc) results in robust attenuation of amyloid β (Aβ) accumulation in a mouse model of Alzheimer-type Aβ pathology. sTLR5Fc binds to oligomeric and fibrillar Aβ with high affinity, forms complexes with Aβ, and blocks Aβ toxicity. Oligomeric and fibrillar Aβ modulates flagellin-mediated activation of human TLR5 but does not, by itself, activate TLR5 signaling. Genetic analysis shows that rare protein coding variants in human TLR5 may be associated with a reduced risk of AD. Further, transcriptome analysis shows altered TLR gene expression in human AD. Collectively, our data suggest that TLR5 decoy receptor–based biologics represent a novel and safe Aβ-selective class of biotherapy in AD.
Source: The Journal of Experimental Medicine - Category: Internal Medicine Authors: Chakrabarty, P., Li, A., Ladd, T. B., Strickland, M. R., Koller, E. J., Burgess, J. D., Funk, C. C., Cruz, P. E., Allen, M., Yaroshenko, M., Wang, X., Younkin, C., Reddy, J., Lohrer, B., Mehrke, L., Moore, B. D., Liu, X., Ceballos-Diaz, C., Rosario, A. M. Tags: Neuroinflammation, Innate Immunity and Inflammation, Neuroscience Brief Definitive Reports Source Type: research