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M9640761.TXT
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1996-03-04
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Document 0761
DOCN M9640761
TI Increased expression of tumor necrosis factor-alpha receptors in the
brains of patients with AIDS.
DT 9604
AU Sippy BD; Hofman FM; Wallach D; Hinton DR; Department of Pathology,
University of Southern California School; of Medicine, Los Angeles
90033, USA.
SO J Acquir Immune Defic Syndr Hum Retrovirol. 1995 Dec 15;10(5):511-21.
Unique Identifier : AIDSLINE MED/96142213
AB Tumor necrosis factor (TNF)-alpha has been shown to be increased in
brain tissue of AIDS patients and may function as a mediator of cerebral
damage. We initiated a study to determine the cellular localization and
degree of protein and mRNA expression of the two specific TNF-alpha
receptors (TNF-Rs), p55 and p75, in brain tissues from AIDS patients.
Cerebral white matter obtained at autopsy from 13 AIDS patients, 10
unhealthy controls, and 4 healthy controls was evaluated. Double-label
immunohistochemistry revealed prominent up-regulation of p55 and p75
TNF-Rs on activated macrophages and microglial cells in all AIDS
patients; no increased staining was found on astrocytes. Staining was
most prominent in patients with opportunistic infection of the brain and
in microglial nodules of patients with HIV encephalitis. Brain tissues
also showed increased expression of interleukin (IL)-1 beta, IL-6, and
TNF-alpha, cytokines known to up-regulate the TNF-Rs. Increased staining
for TNF-Rs was also found in patients with multiple sclerosis, chronic
cerebral edema, and radiation necrosis but not in an asymptomatic
HIV-positive patient without AIDS. Reverse transcriptase polymerase
chain reaction performed on adjacent sections from five AIDS patients
revealed up-regulation from normal for p55 in all patients and for p75
in three patients. The up-regulation of both TNF-Rs in AIDS suggests
that macrophages and microglial cells may be important in amplifying the
TNF-alpha response.
DE Acquired Immunodeficiency Syndrome/COMPLICATIONS/*METABOLISM/ PATHOLOGY
Adult Antigens, CD/*BIOSYNTHESIS/GENETICS AIDS Dementia
Complex/ETIOLOGY/METABOLISM/PATHOLOGY Brain/*METABOLISM/PATHOLOGY
Comparative Study Electrophoresis, Agar Gel Fluorescent Antibody
Technique Human Immunoenzyme Techniques Interleukin-1/BIOSYNTHESIS
Interleukin-6/BIOSYNTHESIS Macrophage Activation
Macrophages/METABOLISM Middle Age Neuroglia/METABOLISM Polymerase
Chain Reaction Receptors, Tumor Necrosis Factor/*BIOSYNTHESIS/GENETICS
RNA, Messenger/BIOSYNTHESIS Support, U.S. Gov't, P.H.S. Tumor Necrosis
Factor/BIOSYNTHESIS Up-Regulation (Physiology) JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).