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Nectin-1 is an adherens junction protein that serves as an entry receptor for neurotropic herpes simplex virus (HSV). The expression of nectin-1 in the central nervous system (CNS) has not been well defined. Furthermore, it is not known whether HSV infection has an effect on nectin-1 expression in the brain. To better understand nectin-1 expression in normal and HSV-infected brain, the authors used immunohistochemistry to characterize the expression of nectin-1 in brain tissue of uninfected adult mice and mice infected with HSV-1. In the CNS of untreated and mock-infected mice, virtually all neurons, ependymal cells, choroid plexus epithelial cells, meningothelial cells, and vascular endothelial cells expressed nectin-1. Many oligodendrocytes, astrocytes, and vascular smooth muscle cells also demonstrated nectin-1 expression, but a minority of these cells did not stain for nectin-1. Brain tissue derived from mice euthanized 5 to 8 days after intracerebral inoculation of HSV-1 showed inflammation and widespread expression of HSV-1 proteins in neurons. In HSV-1-infected brains, many inflammatory cells showed nectin-1 expression and neuronal nectin-1 staining showed a wider variation in signal strength than that detected in uninfected tissues. Many neurons showing nuclear fragmentation consistent with the morphologic appearance of apoptosis showed little or no evidence of nectin-1 expression, whereas occasional neurons stained more intensely positive for nectin-1 than those in uninfected brain tissue. These findings confirm and extend previous observations of nectin-1 expression in the nervous system and suggest that HSV-1 infection leads to changes in nectin-1 expression in the CNS, which may contribute to HSV-induced pathology and dissemination.
Applied Immunohistochemistry & Molecular Morphology – Wolters Kluwer Health
Published: Sep 1, 2006
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