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2004 DEC 1 - (NewsRx.com & NewsRx.net) -- Scientists have modeled hemorrhagic and encephalitic complications of Alzheimer amyloid-beta vaccination in nonhuman primates.
"The potential of amyloid-beta (A-beta) immunization as a disease-modifying therapy for Alzheimer disease is limited by the occurrence of encephalitic side effects in a subset of treated patients. The encephalitis was not predicted from immunization studies in transgenic, A-beta-depositing mice. More recently, studies in these same mice indicate that passive immunization with certain anti-A-beta antibodies can induce microhemorrhage," scientists writing in the journal Current Opinion in Immunology report.
"Cerebral amyloid angiopathy (CAA) may play a key role in determining the risk for these complications," said Sam Gandy at Thomas Jefferson University and Lary Walker at Emory University. "Because aged nonhuman primates (NHPs) have a more human-like immune system than rodents, and because NHPs naturally develop senile plaques and CAA with age, NHPs appear to be important, adjunctive models for assessing the efficacy and safety of immunotherapeutics for Alzheimer disease. Conversely, the ...