Human erythrocytes bind and inactivate type 5 adenovirus by presenting Coxsackie virus-adenovirus receptor and complement receptor 1.

Blood
Robert C CarlisleLeonard W Seymour

Abstract

Type 5 adenovirus (Ad5) is a human pathogen that has been widely developed for therapeutic uses, with only limited success to date. We report here the novel finding that human erythrocytes present Coxsackie virus-adenovirus receptor (CAR) providing an Ad5 sequestration mechanism that protects against systemic infection. Interestingly, erythrocytes from neither mice nor rhesus macaques present CAR. Excess Ad5 fiber protein or anti-CAR antibody inhibits the binding of Ad5 to human erythrocytes and cryo-electron microscopy shows attachment via the fiber protein of Ad5, leading to close juxtaposition with the erythrocyte membrane. Human, but not murine, erythrocytes also present complement receptor (CR1), which binds Ad5 in the presence of antibodies and complement. Transplantation of human erythrocytes into nonobese diabetic/severe combined immunodeficiency mice extends blood circulation of intravenous Ad5 but decreases its extravasation into human xenograft tumors. Ad5 also shows extended circulation in transgenic mice presenting CAR on their erythrocytes, although it clears rapidly in transgenic mice presenting erythrocyte CR1. Hepatic infection is inhibited in both transgenic models. Erythrocytes may therefore restrict Ad5 infe...Continue Reading

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Methods Mentioned

BETA
flow cytometry
PCR
electrophoresis
transgenics
xenograft
transgenic
genetic modification

Software Mentioned

Oligreen
Prism
GraphPad

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