Immune modulation to clear amyloid-beta (A?) is a promising therapy for Alzheimer's disease (AD). Although a clinical trial on this approach was recently halted because of T-cell related encephalitis in a small subset of patients, its preliminary findings indicate cognitive stabilization and clearance of brain A? deposits. During the first years of this grant, and prior to the adverse reactions in the trial, we have been assessing various A? derivatives as a safer approach for AD immunotherapy. All our vaccines improve cognition in transgenic (tg) mice indicating that these homologs are good candidates for clinical trials. Prior to this, non-human primate studies are warranted because their immune system and A? levels are closer to humans than the mouse equivalent. Hence, Specific Aim 1 is: To assess potential therapeutic benefits and side effects, in particular T-cell toxicity and cerebral bleeding, of A? derivative immunotherapy in lemur primates. We will determine: 1) the immune response;2) A? levels in plasma and urine;3) cognitive effects;4) potential acute and chronic toxicity;and 5) brain amyloid burden and associated pathology following immunization with A? derivative immunogens in lemur primates (Microcebus murinus). In addition to histological and biochemical analysis at the end of the study, treatment efficacy and potential cerebral bleeding will be evaluated in vivo by brain imaging. We have developed MRI probes that allow us to detect brain amyloid plaques in vivo. This technology is ideally suited to monitor treatment efficacy in vivo. Because of the paramagnetic nature of iron, this method will also be useful to monitor potential cerebral bleeding. To avoid possible T-cell adverse effects, clinical A? antibody trials are underway but cerebral bleeding has been observed with this approach in tg mice.
Specific Aim 2 is: A) To clarify the mechanism of cerebral microhemorrhages following A? antibody therapy and;B) To compare strategies to avoid this side effect while promoting A? clearance. Towards this end, tg mouse models that primarily develop vascular- or parenchymal A? deposits will be immunized with anti-A? antibodies or A? derivatives. Treatment efficacy and potential cerebral bleeding will be monitored with magnetic resonance imaging (MRI) and with histological and biochemical analyses at the end of the study. The animals will undergo extensive behavioral assessment as well. We will determine in tg mice if the bleeding is related to removal of vascular or parenchymal amyloid. Treatment with proteolytic antibodies that cleave A? is less likely to have this side effect, and we have not observed bleeding with our active immunization approach further supporting its feasibility for human use. Overall, these studies should provide valuable information on which type of immunotherapy is likely to be safe and effective, and should identify the appropriate A?-targeting immunotherapy for use in clinical trials.
The aim of the proposed studies is to continue our development of a safe immunotherapy targeting amyloid-beta, a major hallmark of Alzheimer's disease (AD).
The first aim will be performed in lemur primates, a model of AD, to verify the safety profile of our A? derivatives prior to clinical trials.
The second aim will be performed in transgenic mouse models of AD because of the larger number of animals required and/or because of the earlier developmental stage of those approaches.
|Klionsky, Daniel J (see original citation for additional authors) (2016) Guidelines for the use and interpretation of assays for monitoring autophagy (3rd edition). Autophagy 12:1-222|
|Krishnamurthy, Pavan K; Rajamohamedsait, Hameetha B; Gonzalez, Veronica et al. (2016) Sex and Immunogen-Specific Benefits of Immunotherapy Targeting Islet Amyloid Polypeptide in Transgenic and Wild-Type Mice. Front Endocrinol (Lausanne) 7:62|
|Santin, Mathieu D; Vandenberghe, Michel E; Herard, Anne-Sophie et al. (2016) In Vivo Detection of Amyloid Plaques by Gadolinium-Stained MRI Can Be Used to Demonstrate the Efficacy of an Anti-amyloid Immunotherapy. Front Aging Neurosci 8:55|
|Congdon, Erin E; Lin, Yan; Rajamohamedsait, Hameetha B et al. (2016) Affinity of Tau antibodies for solubilized pathological Tau species but not their immunogen or insoluble Tau aggregates predicts in vivo and ex vivo efficacy. Mol Neurodegener 11:62|
|Shamir, Dov B; Rosenqvist, Nina; Rasool, Suhail et al. (2016) Internalization of tau antibody and pathological tau protein detected with a flow cytometry multiplexing approach. Alzheimers Dement 12:1098-1107|
|Sigurdsson, Einar M (2016) Tau Immunotherapy. Neurodegener Dis 16:34-8|
|Fá, M; Puzzo, D; Piacentini, R et al. (2016) Extracellular Tau Oligomers Produce An Immediate Impairment of LTP and Memory. Sci Rep 6:19393|
|Planque, Stephanie A; Nishiyama, Yasuhiro; Sonoda, Sari et al. (2015) Specific amyloid ? clearance by a catalytic antibody construct. J Biol Chem 290:10229-41|
|Roy, Maggie; Cardoso, Cécile; Dorieux, Olène et al. (2015) Age-associated evolution of plasmatic amyloid in mouse lemur primates: relationship with intracellular amyloid deposition. Neurobiol Aging 36:149-56|
|Pedersen, Jan Torleif; Sigurdsson, Einar M (2015) Tau immunotherapy for Alzheimer's disease. Trends Mol Med 21:394-402|
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