TY - JOUR
T1 - Neuronal fractalkine expression in HIV-1 encephalitis
T2 - Roles for macrophage recruitment and neuroprotection in the central nervous system
AU - Tong, Ning
AU - Perry, Seth W.
AU - Zhang, Qing
AU - James, Harold J.
AU - Guo, Huang
AU - Brooks, Andrew
AU - Bal, Harshawardhan
AU - Kinnear, Sandra A.
AU - Fine, Steven
AU - Epstein, Leon G.
AU - Dairaghi, Daniel
AU - Schall, Thomas J.
AU - Gendelman, Howard E.
AU - Dewhurst, Stephen
AU - Sharer, Leroy R.
AU - Gelbard, Harris A.
PY - 2000/2/1
Y1 - 2000/2/1
N2 - HIV-1 infection of the brain results in chronic inflammation, contributing to the neuropathogenesis of HIV-1 associated neurologic disease. HIV-1-infected mononuclear phagocytes (MP) present in inflammatory infiltrates produce neurotoxins that mediate inflammation, dysfunction, and neuronal apoptosis. Neurologic disease is correlated with the relative number of MP in and around inflammatory infiltrates and not viral burden. It is unclear whether these cells also play a neuroprotective role. We show that the chemokine, fractalkine (FKN), is markedly up-regulated in neurons and neuropil in brain tissue from pediatric patients with HIV-1 encephalitis (HIVE) compared with those without HIVE, or that were HIV-1 seronegative. FKN receptors are expressed on both neurons and microglia in patients with HIVE. These receptors are localized to cytoplasmic structures which are characterized by a vesicular appearance in neurons which may he in cell-to- cell contact with MPs. FKN colocalizes with glutamate in these neurons. Similar findings are observed in brain tissue from an adult patient with HIVE. FKN is able to potently induce the migration of primary human monocytes across an endothelial cell/primary human fetal astrocyte trans-well bilayer, and is neuroprotective to cultured neurons when coadministered with either the HIV-1 neurotoxin platelet activating factor (PAF) or the regulatory HIV-1 gene product Tat. Thus focal inflammation in brain tissue with HIVE may up- regulate neuronal FKN levels, which in turn may he a neuroimmune modulator recruiting peripheral macrophages into the brain, and in a paracrine fashion protecting glutamatergic neurons.
AB - HIV-1 infection of the brain results in chronic inflammation, contributing to the neuropathogenesis of HIV-1 associated neurologic disease. HIV-1-infected mononuclear phagocytes (MP) present in inflammatory infiltrates produce neurotoxins that mediate inflammation, dysfunction, and neuronal apoptosis. Neurologic disease is correlated with the relative number of MP in and around inflammatory infiltrates and not viral burden. It is unclear whether these cells also play a neuroprotective role. We show that the chemokine, fractalkine (FKN), is markedly up-regulated in neurons and neuropil in brain tissue from pediatric patients with HIV-1 encephalitis (HIVE) compared with those without HIVE, or that were HIV-1 seronegative. FKN receptors are expressed on both neurons and microglia in patients with HIVE. These receptors are localized to cytoplasmic structures which are characterized by a vesicular appearance in neurons which may he in cell-to- cell contact with MPs. FKN colocalizes with glutamate in these neurons. Similar findings are observed in brain tissue from an adult patient with HIVE. FKN is able to potently induce the migration of primary human monocytes across an endothelial cell/primary human fetal astrocyte trans-well bilayer, and is neuroprotective to cultured neurons when coadministered with either the HIV-1 neurotoxin platelet activating factor (PAF) or the regulatory HIV-1 gene product Tat. Thus focal inflammation in brain tissue with HIVE may up- regulate neuronal FKN levels, which in turn may he a neuroimmune modulator recruiting peripheral macrophages into the brain, and in a paracrine fashion protecting glutamatergic neurons.
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U2 - 10.4049/jimmunol.164.3.1333
DO - 10.4049/jimmunol.164.3.1333
M3 - Article
C2 - 10640747
AN - SCOPUS:0034141496
SN - 0022-1767
VL - 164
SP - 1333
EP - 1339
JO - Journal of Immunology
JF - Journal of Immunology
IS - 3
ER -