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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Costa, E. Pesold, C. Kriho, V. Guidotti, A. Liu, W. S. Pappas, G. D. Rodriguez, M. A. |
| Description | Author Affiliation: Rodriguez MA ( Psychiatric Institute, Department of Psychiatry, University of Illinois College of Medicine, Chicago, IL 60612, USA.); |
| Abstract | The expression of telencephalic reelin (Reln) and glutamic acid decarboxylase mRNAs and their respective cognate proteins is down-regulated in postmortem brains of schizophrenia and bipolar disorder patients. To interpret the pathophysiological significance of this finding, immunoelectron microscopic experiments are required, but these cannot be carried out in postmortem human brains. As an alternative, we carried out such experiments in the cortex of rats and nonhuman primates. We found that Reln is expressed predominantly in layer I of both cortices and is localized to bitufted (double-bouquet), horizontal, and multipolar gamma-aminobutyric acid-ergic interneurons, which secrete Reln into extracellular matrix. Reln secretion is mediated by a constitutive mechanism that depends on the expression of a specific signal peptide present in the Reln carboxy-terminal domain. Extracellular matrix Reln is found to aggregate in proximity of postsynaptic densities expressed in apical dendrite spines, which include also the alpha(3) subunit of integrin receptors. Most pyramidal neurons of various cortical layers express the mouse-disabled 1 (Dab1) protein, which, after phosphorylation by a soluble tyrosine kinase, functions as an adapter protein, probably mediating a modulation of cytoskeleton protein expression. We hypothesize that the decrease of neuropil and dendritic spine density reported to exist in the neocortex of psychiatric patients may be related to a down-regulation of Reln-integrin interactions and the consequent decrease of cytoskeleton protein turnover. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 7 |
| Volume Number | 97 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 2000-04-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Antigens, CD Metabolism Cell Adhesion Molecules, Neuronal Cerebral Cortex Dendrites Extracellular Matrix Proteins Integrins Nerve Tissue Proteins Animals Cytology Erythrocebus Patas Extracellular Matrix Integrin Alpha3 Macaca Papio Rats, Inbred F344 Serine Endopeptidases Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, P.H.S. Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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