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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Rydel, R. E. May, P. C. Cox, L. M. Gitter, B. D. |
| Description | Author Affiliation: Gitter BD ( Central Nervous System Research Division, Lilly Research Laboratories, Eli Lilly and Company, Indianapolis, IN 46285, USA.); |
| Abstract | Neurodegenerative processes in Alzheimer disease (AD) are thought to be driven in part by the deposition of amyloid beta (A beta), a 39- to 43-amino acid peptide product resulting from an alternative cleavage of amyloid precursor protein. Recent descriptions of in vitro neurotoxic effects of A beta support this hypothesis and suggest toxicity might be mediated by A beta-induced neuronal calcium disregulation. In addition, it has been reported that 'aging' A beta results in increased toxic potency due to peptide aggregation and formation of a beta-sheet secondary structure. In addition, A beta might also promote neuropathology indirectly by activating immune/inflammatory pathways in affected areas of the brain (e.g., cortex and hippocampus). Here we report that A beta can modulate cytokine secretion [interleukins 6 and 8 (IL-6 and IL-8)] from human astrocytoma cells (U-373 MG). Freshly prepared and aged A beta modestly stimulated IL-6 and IL-8 secretion from U-373 MG cells. However, in the presence of interleukin-1 beta (IL-1 beta), aged, but not fresh, A beta markedly potentiated (3- to 8-fold) cytokine release. In contrast, aged A beta did not potentiate substance P (NK-1)- or histamine (H1)-stimulated cytokine production. Further studies showed that IL-1 beta-induced cytokine release was potentiated by A beta-(25-35), while A beta-(1-16) was inactive. Calcium disregulation may be responsible for the effects of A beta on cytokine production, since the calcium ionophore A23187 similarly potentiated IL-1 beta-induced cytokine secretion and EGTA treatment blocked either A beta or A23187 activity. Thus, chronic neurodegeneration in AD-affected brain regions may be mediated in part by the ability of A beta to exacerbate inflammatory pathways in a conformation-dependent manner. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 23 |
| Volume Number | 92 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 1995-12-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Amyloid Beta-Peptides Pharmacology Astrocytes Metabolism Interleukin-1 Interleukins Secretion Peptide Fragments Alzheimer Disease Etiology Drug Effects Astrocytoma Calcium Dose-Response Relationship, Drug Drug Interactions Encephalitis Interleukin-6 Interleukin-8 Protein Conformation Tumor Cells, Cultured Comparative Study Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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