Abstract
Alzheimer’s disease (AD) is one of the most common forms of dementia and has been a global concern for several years. Due to the multi-factorial nature of the disease, AD has become irreversible, fatal and imposes a tremendous socio-economic burden. Even though experimental medicines suggested moderate benefits, AD still lacks an effective treatment strategy for the management of symptoms or cure. Among the various hypotheses that describe development and progression of AD, the amyloid hypothesis has been a long-term adherent to the AD due to the involvement of various forms of Amyloid beta (Aβ) peptides in the impairment of neuronal and cognitive functions. Hence, majority of the drug discovery approaches in the past have focused on the prevention of the accumulation of Aβ peptides. Currently, there are several agents in the phase III clinical trials that target Aβ or the various macromolecules triggering Aβ deposition. In this review, we present the state of the art knowledge on the functional aspects of the key players involved in the amyloid hypothesis. Furthermore, we also discuss anti-amyloid agents present in the Phase III clinical trials.
Keywords: Beta secretase, gamma secretase, glutaminyl cyclase, RAGE, Aβ, amyloid hypothesis, Alzheimer's disease.
Graphical Abstract
[http://dx.doi.org/10.1136/bmj.b158] [PMID: 19196745]
[http://dx.doi.org/10.1016/S0891-5849(96)00629-6] [PMID: 9165306]
[http://dx.doi.org/10.1016/j.jalz.2007.09.005] [PMID: 18790462]
[http://dx.doi.org/10.1016/S0079-6123(08)64021-2] [PMID: 9932414]
[http://dx.doi.org/10.2174/157015911798376181] [PMID: 22654725]
[PMID: 20498822]
[http://dx.doi.org/10.1016/j.trci.2018.03.009] [PMID: 29955663]
[http://dx.doi.org/10.2174/1567205012666150701103107] [PMID: 26412218]
[http://dx.doi.org/10.1111/j.1582-4934.2009.00609.x] [PMID: 19374683]
[http://dx.doi.org/10.1016/j.neuron.2014.10.038] [PMID: 25442939]
[http://dx.doi.org/10.1186/s13195-017-0293-3] [PMID: 28818091]
[http://dx.doi.org/10.1074/jbc.M115.691840] [PMID: 27458018]
[http://dx.doi.org/10.1021/jp506258g] [PMID: 25153942]
[http://dx.doi.org/10.1021/acschemneuro.6b00154] [PMID: 27322435]
[http://dx.doi.org/10.1016/j.neuron.2014.01.045] [PMID: 24559670]
[http://dx.doi.org/10.15252/emmm.201606566] [PMID: 27861127]
[http://dx.doi.org/10.1007/s00401-013-1129-2] [PMID: 23685882]
[http://dx.doi.org/10.1021/acs.biochem.6b00453] [PMID: 27750419]
[http://dx.doi.org/10.1073/pnas.1618657114] [PMID: 27930341]
[http://dx.doi.org/10.1083/jcb.201502001] [PMID: 26694839]
[http://dx.doi.org/10.1101/cshperspect.a006262] [PMID: 22675658]
[http://dx.doi.org/10.1074/jbc.M117.801514] [PMID: 28924036]
[http://dx.doi.org/10.3233/JAD-179941] [PMID: 29843241]
[http://dx.doi.org/10.1038/srep21734] [PMID: 26898943]
[http://dx.doi.org/10.1021/jp406067n] [PMID: 23841511]
[http://dx.doi.org/10.3233/JAD-179941] [PMID: 29843241]
[http://dx.doi.org/10.1186/1750-1326-9-48] [PMID: 25394486]
[http://dx.doi.org/10.1111/j.1582-4934.2009.00861.x] [PMID: 19650832]
[http://dx.doi.org/10.3390/molecules22101692] [PMID: 28994715]
[http://dx.doi.org/10.1016/j.ebiom.2016.03.035] [PMID: 27211547]
[http://dx.doi.org/10.1002/jnr.23823] [PMID: 27531392]
[http://dx.doi.org/10.1155/2012/272374]
[http://dx.doi.org/10.1016/j.bcp.2014.01.032] [PMID: 24513321]
[http://dx.doi.org/10.1126/science.2111583] [PMID: 2111583]
[http://dx.doi.org/10.1073/pnas.96.12.6959] [PMID: 10359821]
[http://dx.doi.org/10.1038/35017108] [PMID: 10878814]
[http://dx.doi.org/10.1096/fj.05-4986com] [PMID: 16449801]
[http://dx.doi.org/10.1074/jbc.M005339200] [PMID: 10956649]
[http://dx.doi.org/10.1006/mcne.1999.0811] [PMID: 10656250]
[http://dx.doi.org/10.1007/7355_2016_16]
[http://dx.doi.org/10.1021/jm0607451] [PMID: 17034121]
[http://dx.doi.org/10.1111/ejn.12235] [PMID: 23773065]
[http://dx.doi.org/10.1038/ng0892-345] [PMID: 1302033]
[http://dx.doi.org/10.1038/990107] [PMID: 10591213]
[http://dx.doi.org/10.1096/fj.04-3426com] [PMID: 15857888]
[http://dx.doi.org/10.1038/85059] [PMID: 11224535]
[http://dx.doi.org/10.1016/S0969-9961(03)00104-9] [PMID: 13678669]
[http://dx.doi.org/10.1038/nn1531] [PMID: 16136043]
[http://dx.doi.org/10.1523/JNEUROSCI.2766-05.2005] [PMID: 16354928]
[http://dx.doi.org/10.1001/archneur.59.9.1381] [PMID: 12223024]
[http://dx.doi.org/10.1073/pnas.0205689101] [PMID: 14978286]
[http://dx.doi.org/10.1038/nm0103-3] [PMID: 12514700]
[http://dx.doi.org/10.1006/nbdi.2002.0515] [PMID: 12270690]
[http://dx.doi.org/10.1074/jbc.M608856200] [PMID: 17303576]
[http://dx.doi.org/10.1016/j.brainres.2003.09.086] [PMID: 15120577]
[http://dx.doi.org/10.1016/j.neuron.2007.05.012] [PMID: 17553422]
[http://dx.doi.org/10.1007/s00702-003-0095-6] [PMID: 15057522]
[http://dx.doi.org/10.1073/pnas.241509198] [PMID: 11698669]
[http://dx.doi.org/10.1074/jbc.M303861200] [PMID: 14507929]
[http://dx.doi.org/10.1074/jbc.M311601200] [PMID: 14970212]
[http://dx.doi.org/10.1016/j.mcn.2003.12.013] [PMID: 15080893]
[http://dx.doi.org/10.1074/jbc.M414248200] [PMID: 15749709]
[http://dx.doi.org/10.1038/nn1797] [PMID: 17099708]
[http://dx.doi.org/10.1096/fj.08-106666] [PMID: 18413858]
[http://dx.doi.org/10.1074/jbc.M412938200] [PMID: 15833746]
[http://dx.doi.org/10.1074/jbc.M414648200] [PMID: 15824102]
[http://dx.doi.org/10.1074/jbc.M115.697995] [PMID: 26574544]
[http://dx.doi.org/10.1038/ng0394-251] [PMID: 8012386]
[http://dx.doi.org/10.1074/jbc.271.15.9100] [PMID: 8621560]
[http://dx.doi.org/10.1038/nn0901-887] [PMID: 11528419]
[http://dx.doi.org/10.1097/00001756-200210280-00005] [PMID: 12395079]
[http://dx.doi.org/10.1111/j.1471-4159.2006.04443.x] [PMID: 17448150]
[http://dx.doi.org/10.1038/349704a0] [PMID: 1671712]
[http://dx.doi.org/10.1093/hmg/6.12.2087] [PMID: 9328472]
[http://dx.doi.org/10.1074/jbc.M104135200] [PMID: 11441013]
[http://dx.doi.org/10.1016/0006-291X(91)91706-I] [PMID: 1681804]
[http://dx.doi.org/10.1126/science.1132341] [PMID: 16990514]
[http://dx.doi.org/10.1016/j.neurobiolaging.2007.01.002] [PMID: 17331621]
[http://dx.doi.org/10.1016/S1044-7431(03)00227-6] [PMID: 14664815]
[http://dx.doi.org/10.1016/j.celrep.2013.06.005] [PMID: 23831026]
[http://dx.doi.org/10.1523/JNEUROSCI.1334-10.2010] [PMID: 20592204]
[http://dx.doi.org/10.1073/pnas.0710373105] [PMID: 18385378]
[http://dx.doi.org/10.1002/emmm.201101084] [PMID: 22903875]
[http://dx.doi.org/10.1007/s00018-009-8435-9] [PMID: 19189053]
[http://dx.doi.org/10.1093/emboj/21.8.1948] [PMID: 11953314]
[http://dx.doi.org/10.1126/science.1065412] [PMID: 11679632]
[http://dx.doi.org/10.1074/jbc.M113.517540] [PMID: 24078628]
[http://dx.doi.org/10.1186/1750-1326-7-16] [PMID: 22534039]
[http://dx.doi.org/10.1074/jbc.M206872200] [PMID: 12223485]
[http://dx.doi.org/10.1073/pnas.0509822102] [PMID: 16384915]
[http://dx.doi.org/10.2174/138945010790980349] [PMID: 20015011]
[http://dx.doi.org/10.1038/34910] [PMID: 9450754]
[http://dx.doi.org/10.1038/19077] [PMID: 10206644]
[http://dx.doi.org/10.1038/35024009] [PMID: 10993067]
[http://dx.doi.org/10.1016/S0896-6273(03)00205-8] [PMID: 12691659]
[http://dx.doi.org/10.1016/j.conb.2004.05.010] [PMID: 15194119]
[http://dx.doi.org/10.1146/annurev-cellbio-100109-104117] [PMID: 20604710]
[http://dx.doi.org/10.1083/jcb.201201076] [PMID: 22753898]
[http://dx.doi.org/10.1111/j.1471-4159.2005.03578.x] [PMID: 16405513]
[http://dx.doi.org/10.1097/00019442-200403000-00006] [PMID: 15010344]
[http://dx.doi.org/10.1038/nm1096-1146] [PMID: 8837617]
[http://dx.doi.org/10.1074/jbc.M209065200] [PMID: 12435726]
[http://dx.doi.org/10.1016/j.neuron.2008.04.015] [PMID: 18579078]
[http://dx.doi.org/10.1186/1750-1326-8-23] [PMID: 23829673]
[http://dx.doi.org/10.1016/j.cell.2006.06.059] [PMID: 16959576]
[http://dx.doi.org/10.1016/S0002-9440(10)64688-3] [PMID: 11395394]
[http://dx.doi.org/10.1111/j.1471-4159.2004.02858.x] [PMID: 15663477]
[http://dx.doi.org/10.1093/embo-reports/kve180] [PMID: 11520861]
[http://dx.doi.org/10.1074/jbc.C400473200] [PMID: 15485850]
[http://dx.doi.org/10.1111/j.1471-4159.2006.04302.x] [PMID: 17241131]
[http://dx.doi.org/10.1016/S0092-8674(02)00809-7] [PMID: 12150997]
[http://dx.doi.org/10.1096/fj.03-0106fje] [PMID: 12923068]
[http://dx.doi.org/10.1242/jcs.01323] [PMID: 15331662]
[http://dx.doi.org/10.1016/j.neuron.2005.04.008] [PMID: 15944124]
[http://dx.doi.org/10.1016/j.neuron.2007.08.008] [PMID: 17920016]
[http://dx.doi.org/10.1073/pnas.0703903104] [PMID: 17556541]
[http://dx.doi.org/10.1074/jbc.M203372200] [PMID: 12032152]
[http://dx.doi.org/10.1186/1750-1326-3-12] [PMID: 18764939]
[http://dx.doi.org/10.1111/febs.12590] [PMID: 24279329]
[http://dx.doi.org/10.1038/nature13567] [PMID: 25043039]
[http://dx.doi.org/10.1074/jbc.M311652200] [PMID: 14709552]
[http://dx.doi.org/10.3233/JAD-2011-101065] [PMID: 21335653]
[http://dx.doi.org/10.1186/1750-1326-7-19] [PMID: 22537414]
[http://dx.doi.org/10.1074/jbc.M311652200] [PMID: 14709552]
[http://dx.doi.org/10.1073/pnas.161102498] [PMID: 11470902]
[http://dx.doi.org/10.1038/nature09325] [PMID: 20811458]
[http://dx.doi.org/10.1111/j.1365-2990.2011.01206.x] [PMID: 21718343]
[http://dx.doi.org/10.3233/JAD-140105] [PMID: 24662099]
[http://dx.doi.org/10.1016/j.biopsych.2014.06.003] [PMID: 25052851]
[http://dx.doi.org/10.1007/s00401-006-0077-5] [PMID: 16865398]
[http://dx.doi.org/10.1111/j.1742-4658.2009.07337.x] [PMID: 19804409]
[http://dx.doi.org/10.1016/j.jmb.2008.03.078] [PMID: 18486145]
[http://dx.doi.org/10.1016/j.biocel.2010.08.015] [PMID: 20833262]
[http://dx.doi.org/10.1038/nature11060] [PMID: 22660329]
[http://dx.doi.org/10.1046/j.1471-4159.2002.01107.x] [PMID: 12354296]
[http://dx.doi.org/10.1021/bi900818a] [PMID: 19518051]
[http://dx.doi.org/10.1038/nm.1872] [PMID: 18836460]
[http://dx.doi.org/10.1186/1471-2202-14-108] [PMID: 24083638]
[http://dx.doi.org/10.1007/s00401-015-1395-2] [PMID: 25666182]
[http://dx.doi.org/10.1371/journal.pone.0006197] [PMID: 19593388]
[http://dx.doi.org/10.1002/emmm.201100158] [PMID: 21774078]
[http://dx.doi.org/10.1074/jbc.M111.229385] [PMID: 21330373]
[http://dx.doi.org/10.1515/hsz-2015-0192] [PMID: 26351917]
[http://dx.doi.org/10.1074/jbc.M110.208595] [PMID: 21288892]
[http://dx.doi.org/10.1073/pnas.0504184102] [PMID: 16135565]
[PMID: 1378843]
[http://dx.doi.org/10.1016/j.str.2010.05.017] [PMID: 20947022]
[http://dx.doi.org/10.1016/j.tibs.2011.08.008] [PMID: 22019011]
[http://dx.doi.org/10.3945/jn.113.189480] [PMID: 24744309]
[http://dx.doi.org/10.1007/s00109-005-0688-7] [PMID: 16133426]
[http://dx.doi.org/10.1111/1744-9987.12103] [PMID: 24965297]
[http://dx.doi.org/10.1016/j.bbrc.2014.08.042] [PMID: 25130465]
[http://dx.doi.org/10.1155/2014/754069] [PMID: 25114379]
[http://dx.doi.org/10.3892/mmr.2014.3113] [PMID: 25523934]
[http://dx.doi.org/10.1016/j.neuropharm.2014.09.019] [PMID: 25261783]
[http://dx.doi.org/10.4062/biomolther.2012.20.3.245] [PMID: 24130920]
[http://dx.doi.org/10.1186/1741-7015-10-105] [PMID: 22989295]
[http://dx.doi.org/10.1161/01.STR.0000143452.85382.d1] [PMID: 15459432]
[http://dx.doi.org/10.1038/77397]
[http://dx.doi.org/10.1172/JCI10498] [PMID: 11120756]
[PMID: 15339642]
[http://dx.doi.org/10.1016/j.neuron.2008.01.003] [PMID: 18215617]
[http://dx.doi.org/10.1016/j.neuron.2004.07.017] [PMID: 15294142]
[http://dx.doi.org/10.1007/s00401-006-0115-3] [PMID: 16865397]
[http://dx.doi.org/10.1084/jem.20120201] [PMID: 24081950]
[http://dx.doi.org/10.4049/jimmunol.1502169] [PMID: 27798148]
[http://dx.doi.org/10.1074/jbc.M110.169276] [PMID: 20943659]
[http://dx.doi.org/10.1016/S0896-6273(01)00234-3] [PMID: 11301018]
[http://dx.doi.org/10.1172/JCI200113992] [PMID: 11560943]
[http://dx.doi.org/10.1172/JCI10498] [PMID: 11120756]
[http://dx.doi.org/10.1523/JNEUROSCI.3987-12.2012] [PMID: 23152628]
[http://dx.doi.org/10.1523/JNEUROSCI.3487-13.2013] [PMID: 24305823]
[http://dx.doi.org/10.1111/j.1471-4159.2010.07002.x] [PMID: 20854368]
[http://dx.doi.org/10.1097/00002093-199501002-00005] [PMID: 8534419]
[http://dx.doi.org/10.1002/ana.410360506] [PMID: 7979218]
[http://dx.doi.org/10.1523/JNEUROSCI.18-09-03213.1998] [PMID: 9547230]
[http://dx.doi.org/10.1006/jmbi.1997.1245] [PMID: 9325095]
[http://dx.doi.org/10.1016/j.pneurobio.2004.10.004] [PMID: 15649580]
[http://dx.doi.org/10.1016/S0928-4257(99)80002-3] [PMID: 9789834]
[http://dx.doi.org/10.1016/S0896-6273(00)80108-7] [PMID: 8608006]
[http://dx.doi.org/10.2174/1874467208666150507105105] [PMID: 25966694]
[http://dx.doi.org/10.1083/jcb.128.5.893] [PMID: 7876312]
[http://dx.doi.org/10.1146/annurev.biochem.76.053105.094237] [PMID: 17506640]
[http://dx.doi.org/10.1016/j.neuron.2008.06.008] [PMID: 18667150]
[http://dx.doi.org/10.1016/j.neuron.2008.04.015] [PMID: 18579078]
[http://dx.doi.org/10.1046/j.1471-4159.1997.69041580.x] [PMID: 9326287]
[http://dx.doi.org/10.1111/j.1582-4934.2002.tb00454.x] [PMID: 12611640]
[http://dx.doi.org/10.1016/j.neuron.2004.09.012] [PMID: 15450156]
[http://dx.doi.org/10.1038/emboj.2010.279] [PMID: 21113126]
[http://dx.doi.org/10.1038/nature04089] [PMID: 16281028]
[PMID: 10049997]
[PMID: 11775847]
[http://dx.doi.org/10.1016/S0959-4388(00)00215-4] [PMID: 11399431]
[http://dx.doi.org/10.1016/j.coph.2006.08.011] [PMID: 17088105]
[http://dx.doi.org/10.1038/nn835] [PMID: 11953750]
[http://dx.doi.org/10.1523/JNEUROSCI.20-01-00022.2000] [PMID: 10627577]
[http://dx.doi.org/10.1002/ana.410190202] [PMID: 2421636]
[http://dx.doi.org/10.1111/j.1476-5381.2012.02057.x] [PMID: 22646481]
[http://dx.doi.org/10.1074/jbc.M208788200] [PMID: 12239221]
[http://dx.doi.org/10.1084/jem.20021546] [PMID: 12796468]
[http://dx.doi.org/10.1016/S0002-9440(10)64354-4] [PMID: 11786404]
[http://dx.doi.org/10.1038/ni.1836] [PMID: 20037584]
[http://dx.doi.org/10.1073/pnas.1015413108] [PMID: 21383152]
[http://dx.doi.org/10.1152/physrev.00015.2008] [PMID: 19126755]
[http://dx.doi.org/10.1038/nrd2927] [PMID: 19721446]
[http://dx.doi.org/10.2174/138161210790170094] [PMID: 20109142]
[http://dx.doi.org/10.1007/s00213-006-0447-7] [PMID: 16832659]
[http://dx.doi.org/10.1016/j.neurobiolaging.2011.05.003] [PMID: 21683475]
[http://dx.doi.org/10.1124/pr.108.000562] [PMID: 19293145]
[http://dx.doi.org/10.3233/JAD-2012-121447] [PMID: 23042213]
[http://dx.doi.org/10.1056/NEJMoa1210951] [PMID: 23883379]
[http://dx.doi.org/10.1021/bi400377p] [PMID: 23614767]
[http://dx.doi.org/10.1038/35102591] [PMID: 11700559]
[http://dx.doi.org/10.1016/S1474-4422(08)70090-5] [PMID: 18450517]
[http://dx.doi.org/10.1001/jama.2009.1866] [PMID: 20009055]
[http://dx.doi.org/10.1021/jm101168r] [PMID: 21141968]
[http://dx.doi.org/10.1517/13543776.2011.547479] [PMID: 21231889]
[http://dx.doi.org/10.1124/jpet.117.240614] [PMID: 28446518]
[http://dx.doi.org/10.1021/acs.biochem.5b00309] [PMID: 26087242]
[http://dx.doi.org/10.1074/jbc.M110.178376] [PMID: 21068391]
[http://dx.doi.org/10.1021/bi902005t] [PMID: 20070125]
[http://dx.doi.org/10.1073/pnas.92.7.2959] [PMID: 7708755]
[http://dx.doi.org/10.1093/hmg/ddu373] [PMID: 25030034]
[http://dx.doi.org/10.2174/138161212799277752] [PMID: 22236121]
[http://dx.doi.org/10.1074/jbc.M112.348037] [PMID: 22992731]
[http://dx.doi.org/10.1038/nn842] [PMID: 11941374]
[http://dx.doi.org/10.1073/pnas.151261398] [PMID: 11438712]
[http://dx.doi.org/10.1007/s00401-015-1489-x] [PMID: 26467270]
[http://dx.doi.org/10.1097/WNF.0b013e3181cb577a] [PMID: 20375655]
[http://dx.doi.org/10.1016/j.jalz.2011.09.224] [PMID: 22672770]
[http://dx.doi.org/10.1056/NEJMoa1312889] [PMID: 24450890]
[http://dx.doi.org/10.1126/scitranslmed.3007941] [PMID: 24648338]
[http://dx.doi.org/10.3233/JAD-2011-110977] [PMID: 21955818]
[http://dx.doi.org/10.1001/archneurol.2011.1538] [PMID: 21987394]
[http://dx.doi.org/10.1186/s13195-017-0318-y] [PMID: 29221491]
[http://dx.doi.org/10.1016/j.jalz.2017.06.112]
[http://dx.doi.org/10.1523/JNEUROSCI.4742-11.2012] [PMID: 22787053]
[http://dx.doi.org/10.1007/s00401-015-1484-2] [PMID: 26433971]
[http://dx.doi.org/10.1212/WNL.0000000000005550] [PMID: 29695589]
[http://dx.doi.org/10.1186/s13195-018-0424-5] [PMID: 30231896]
[http://dx.doi.org/10.1038/s41598-018-24501-0] [PMID: 29686315]
[http://dx.doi.org/10.1038/nature19323] [PMID: 27582220]
[http://dx.doi.org/10.1523/JNEUROSCI.2080-16.2016] [PMID: 27810931]
[PMID: 29181491]