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Normal human sera contain IgG antibodies that specifically bind diverse preamyloid and amyloid proteins and have shown therapeutic potential<jats:italic>in vitro<\/jats:italic>and<jats:italic>in vivo<\/jats:italic>. We cloned one of these antibodies, 3H3, from memory B cells of a healthy individual using a hybridoma method. 3H3 is an affinity-matured IgG that binds a pan-amyloid epitope, recognizing both A\u03b2 and \u03bb Ig light chain (LC) amyloids, which are associated with AD and primary amyloidosis, respectively. The pan-amyloid-binding properties of 3H3 were demonstrated using ELISA, immunohistochemical studies, and competition binding assays. Functional studies showed that 3H3 inhibits both A\u03b2 and LC amyloid formation<jats:italic>in vitro<\/jats:italic>and abrogates disruption of hippocampal synaptic plasticity by AD-patient-derived soluble A\u03b2<jats:italic>in vivo<\/jats:italic>. A 3H3 single-chain variable fragment (scFv) retained the binding specificity of the 3H3 IgG and, when expressed in the brains of transgenic mice using an adeno-associated virus (AAV) vector, decreased parenchymal A\u03b2 amyloid deposition in TgCRND8 mice and ADan (Danish Amyloid) cerebral amyloid angiopathy in the mouse model of FDD. These data indicate that naturally occurring human IgGs can recognize a conformational, amyloid-specific epitope and have potent anti-amyloid activities, providing a rationale to test their potential as antibody therapeutics for diverse neurological and other amyloid diseases.<\/jats:p>","DOI":"10.1523\/jneurosci.5109-14.2015","type":"journal-article","created":{"date-parts":[[2015,4,22]],"date-time":"2015-04-22T16:29:41Z","timestamp":1429720181000},"page":"6265-6276","source":"Crossref","is-referenced-by-count":20,"title":["A Human Monoclonal IgG That Binds A\u03b2 Assemblies and Diverse Amyloids Exhibits Anti-Amyloid Activities<i>In Vitro<\/i>and<i>In Vivo<\/i>"],"prefix":"10.1523","volume":"35","author":[{"given":"Yona","family":"Levites","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Brian","family":"O'Nuallain","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Rama 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