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Elevated microsomal prostaglandin-E synthase-1 in Alzheimer's disease
Uzma A Chaudhry1, Hean Zhuang, Barbara J Crain
1Department of Anesthesiology/Critical Care Medicine, Johns Hopkins University School of Medicine, Baltimore, MD, USA.
Background:
The proinflammatory prostaglandin E(2) (PGE(2)) fluctuates over time in the cerebrospinal fluid of patients with Alzheimer's disease (AD), but the cerebral distribution and expression patterns of microsomal prostaglandin-E synthase (mPGES)-1 have not been compared with those of normal human brains.
Methods:
Middle frontal gyrus tissue from AD and age-matched control brains was analyzed by Western blot, immunofluorescence, and immunohistochemistry with mPGES-1-specific antibodies.
Results:
Western blotting revealed that mPGES-1 expression was significantly elevated in AD tissue. Furthermore, immunofluorescence of mPGES-1 was observed in neurons, microglia, and endothelial cells of control and AD tissue. Although mPGES-1 was consistently present in astrocytes of control tissue, it was present in only some astrocytes of AD tissue. Immunohistochemical staining suggested that mPGES-1 was elevated in pyramidal neurons of AD tissue when compared with controls.
Conclusions:
The results suggest that mPGES-1 is normally expressed constitutively in human neurons, microglia, astrocytes, and endothelial cells but is up-regulated in AD.
Insights
Microsomal prostaglandin-E synthase-1 (mPGES-1) is upregulated in Alzheimer's disease (AD) brains. This enzyme is expressed in brain cells, suggesting its role in AD pathogenesis.
Area of Science:
- Neuroscience
- Biochemistry
- Pathology
Background:
- Prostaglandin E2 (PGE2) levels fluctuate in Alzheimer's disease (AD) cerebrospinal fluid.
- Cerebral distribution and expression of mPGES-1 in AD brains remain uncharacterized compared to normal brains.
Purpose of the Study:
- To compare the cerebral distribution and expression patterns of mPGES-1 in Alzheimer's disease (AD) and normal human brains.
- Investigate the cellular localization of mPGES-1 in different brain cell types.
Main Methods:
- Western blot analysis of middle frontal gyrus tissue from AD and control brains.
- Immunofluorescence and immunohistochemistry using mPGES-1 specific antibodies.
- Analysis of mPGES-1 expression in neurons, microglia, astrocytes, and endothelial cells.
Main Results:
- Western blotting showed significantly elevated mPGES-1 expression in AD brain tissue.
- Immunofluorescence confirmed mPGES-1 presence in neurons, microglia, and endothelial cells in both control and AD tissue.
- Immunohistochemistry indicated elevated mPGES-1 in pyramidal neurons of AD brains and differential expression in astrocytes.
Conclusions:
- Microsomal prostaglandin-E synthase-1 (mPGES-1) is constitutively expressed in human neurons, microglia, astrocytes, and endothelial cells.
- mPGES-1 expression is upregulated in the context of Alzheimer's disease (AD).
- These findings suggest a role for mPGES-1 in AD pathophysiology.
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