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IFN\u03b1 is increased in the CSF of HAD patients compared with HIV patients without dementia. In this study, blocking IFN\u03b1 in a HIV encephalitis (HIVE) mouse model with intraperitoneal injections of IFN\u03b1 neutralizing antibodies (NAbs) significantly improved cognitive function compared with untreated or control antibody-treated HIVE mice during water radial arm maze behavioral testing. Treatment with IFN\u03b1 NAbs significantly decreased microgliosis and prevented loss of dendritic arborization in the brains of HIVE mice. Furthermore, treatment of primary neuron cultures with IFN\u03b1 resulted in dose-dependent loss of dendritic arborization that was blocked with IFN\u03b1 NAb treatment and partially blocked with NMDA antagonists [AP5 and MK801 (dizocilpine maleate)] indicating glutamate signaling is involved in IFN\u03b1-mediated neuronal damage. These results show that IFN\u03b1 has a major role in the pathogenesis of HIVE in mice and is likely important in the development neurocognitive dysfunction in humans with HIV. Blocking IFN\u03b1 could be important in improving cognitive and pathological developments in HAD patients and may be clinically important in other neuroinflammatory diseases as well.<\/jats:p>","DOI":"10.1523\/jneurosci.5595-08.2009","type":"journal-article","created":{"date-parts":[[2009,3,25]],"date-time":"2009-03-25T13:58:01Z","timestamp":1237989481000},"page":"3948-3955","source":"Crossref","is-referenced-by-count":77,"title":["Interferon-\u03b1 Causes Neuronal Dysfunction in Encephalitis"],"prefix":"10.1523","volume":"29","author":[{"given":"Andrew R.","family":"Sas","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Heather","family":"Bimonte-Nelson","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"C. 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