Tau Immunotherapy for Alzheimer ' s Disease is Proving to be as Challenging as Amyloid Immunotherapy

Alzheimer's disease is characterized by the aggregation of first amyloid-β and then tau protein in later stages. It took many years and many attempts to produce immunotherapies capable of clearing amyloid-β from the brain, only to find that this doesn't in fact help patients to any great degree. Amyloid-β may be a side-effect of the causative mechanisms - such as infection, or chronic inflammation - or only important in the earliest stages of the development of Alzheimer's. By the time tau aggregation happens, a different disease process has become dominant. One of the next options is to target tau protein with the same sorts of immunotherapy technologies. So far this is proceeding in much the same way, with the first attempts failing to achieve meaningful levels of clearance. With anti-amyloid antibodies now consistently hitting their target, tau immunotherapy represents the next frontier. In Alzheimer's disease, tau tangles correlate far more closely with cognitive decline than plaques do, and tau aggregates are the main pathology in many related disorders. As with amyloid, however, initial trials of anti-tau antibodies have been beset by failures. Already, several antibodies that bind the N-terminus or C-terminus of tau have been scuttled after not doing recipients any good. Meanwhile, preclinical evidence suggests that antibodies that go after the protein's mid-section, particularly its microtubule-binding region (MTBR), may be better at preventing aggregates ...
Source: Fight Aging! - Category: Research Authors: Tags: Daily News Source Type: blogs