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| Content Provider | Springer Nature Link |
|---|---|
| Author | Singh, Indrapal N. Sorrenti, Giuseppe Kanfer, Julian N. |
| Copyright Year | 1998 |
| Abstract | Amyloid β protein is the major protein component of neuritic plaques found in the brain of Alzheimer's disease. The activation of phospholipase D by amyloid beta protein (25–35), quisqualate and phorbol 12, 13-dibutyrate was investigated in LA-N-2 cells by measuring phosphatidylethanol formation. The activation of phospholipase D by quisqualate and AβP (25–35) was calcium-independent. The AβP (25–35) and quisqualate activation of phospholipase D appeared to be mediated through a pertussis toxin-sensitive GTP-binding protein. Phospholipase D activation by AβP (25–35), quisqualate and phorbol dibutyrate was not blunted by the protein kinase C inhibitors, staurosporine, H-7 and RO-31-8220. However, it was abolished by overnight exposure to phorbol dibutyrate. This activation of phospholipase D was prevented by the tyrosine kinase inhibitor, genistein but not by tyrophostin A. Several excitatory amino acid antagonists were tested for their ability to prevent the phospholipase D activation by quisqualate and AβP (25–35). Only NBQX was effective with an IC$_{50}$ of 75 μM for AβP (25–35) and quisqualate. Activation of phospholipase D by AβP or quisqualate was absent in LA-N-2 cells previously desensitized by quisqualate or AβP (25–35), but the activation by phorbol dibutyrate was unaltered. The responsiveness to AβP and quisqualate in previously desensitized cells reappeared subsequent to a period of resensitization. The observations with the antagonist NBQX, and the desensitization and resensitization experiments, are consistent with a receptor occupancy mediated activation of phospholipase D by quisqualate and by AβP (25–35). |
| Starting Page | 1225 |
| Ending Page | 1232 |
| Page Count | 8 |
| File Format | |
| ISSN | 03643190 |
| Journal | Neurochemical Research |
| Volume Number | 23 |
| Issue Number | 10 |
| e-ISSN | 15736903 |
| Language | English |
| Publisher | Kluwer Academic Publishers-Plenum Publishers |
| Publisher Date | 1998-01-01 |
| Publisher Place | New York |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Neurosciences Neurology Biochemistry |
| Content Type | Text |
| Resource Type | Article |
| Subject | Medicine Biochemistry Cellular and Molecular Neuroscience |
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