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Cell cycle proteins exhibit altered expression patterns in lentiviral-associated encephalitis
Kelly L Jordan-Sciutto1, Guoji Wang, Michael Murphey-Corb
1Department of Pathology, Division of Neuropathology, , University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania 15213, USA. jordan@path.dental.upenn.edu
Summary
Cell cycle proteins like E2F1 and pRb are altered in HIV encephalitis (HIVE) and its simian model. These changes correlate with activated macrophages and impact gene expression in neural cells.
Area of Science:
- Neuroscience
- Cell Biology
- Virology
Background:
- Cell cycle proteins regulate cell division and death, with recent links to neurodegeneration.
- Altered immunostaining of cell cycle regulators retinoblastoma susceptibility gene product (pRb) and E2F1 was previously observed in simian immunodeficiency virus encephalitis (SIVE).
Purpose of the Study:
- To investigate the expression patterns of E2F1 and pRb in human immunodeficiency virus encephalitis (HIVE).
- To correlate these changes with the presence of activated macrophages and alterations in E2F/DNA binding complexes.
Main Methods:
- Immunohistochemistry and immunofluorescent confocal microscopy were used to quantify E2F1 and hyperphosphorylated pRb (ppRb) staining.
- Analysis of nuclear and cytoplasmic fractions for E2F/DNA binding complexes.
Main Results:
- Both E2F1 and ppRb showed significantly increased staining in HIVE and the simian model.
- Increased E2F1 and ppRb correlated with a higher presence of activated macrophages.
- Changes in ppRb and E2F1 staining in SIVE correlated with altered E2F/DNA binding complexes.
Conclusions:
- Cell cycle protein alterations occur in HIVE and its simian model.
- These changes are linked to macrophage activation and have functional implications for neural gene expression during encephalitis.