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Chapter 17 : Cell Cycle Proteins and the Pathogenesis of HIV-1 Encephalitis in the HAART Era

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Cell Cycle Proteins and the Pathogenesis of HIV-1 Encephalitis in the HAART Era, Page 1 of 2

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Abstract:

This chapter discusses the known mechanisms by which cell cycle proteins regulate viability, which of these mechanisms are at play in regulating neuronal viability, evidence that cell cycle regulators are stimulated in HIV encephalitis, the implications of these findings in the post-HAART era, and their potential for additional therapy. The three cell cycle proteins implicated in regulating cell viability are retinoblastoma (pRb), E2F1, and p53. pRb and p53 are the two key targets of signaling pathways that regulate cellular decisions to divide, differentiate, or die. Phosphorylation of pRb has been observed in several in vitro models of neuronal apoptosis including trophic factor withdrawal, DNA damage, low potassium levels, beta-amyloid treatment, and oxidative stress. Further investigation is necessary to determine if they are the ultimate targets for deciding between life and death in neurons for the subset of toxins associated with neurodegeneration in response to HIV encephalitis (HIVE). Investigation into cell cycle proteins in HIVE is still in its early days; however, research thus far indicates that mechanisms of neuronal response to the degenerative stimuli in HIVE are similar to those seen in other neurodegenerative diseases. By understanding the impact of macrophage-secreted factors such as cytokines, chemokines, neurotrophic factors (NTF), and reactive oxygen species (ROS) on modulation of cell cycle regulatory proteins in neurons, a greater insight into neurodegenerative processes in HIVE and neurodegeneration as a whole can be gained and hopefully potential therapeutic targets for treatment of these devastating diseases can be identified.

Citation: Jordan-Sciutto K, Akay C. 2009. Cell Cycle Proteins and the Pathogenesis of HIV-1 Encephalitis in the HAART Era, p 231-244. In Goodkin K, Shapshak P, Verma A (ed), The Spectrum of Neuro-AIDS Disorders. ASM Press, Washington, DC. doi: 10.1128/9781555815691.ch17

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Simian virus 40
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DNA Polymerase alpha
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Reactive Oxygen Species
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Viral Proteins
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FIGURE 1

Potential cell cycle protein response to extracellular signaling of chemokines and NTF. NTF and chemokines bind membrane receptors and activate various intracellular kinase cascades. These cascades can result in activation of p53 and inactivation of pRb by phosphorylation. ppRb releases E2F1, allowing it to induce expression from promoters that can promote proliferation or apoptosis. E2F1 can also induce expression of p14, which will activate p53 by inhibiting MDM2-mediated degradation of p53. p53 activated by p14 can lead to apoptosis or cell cycle arrest.

Citation: Jordan-Sciutto K, Akay C. 2009. Cell Cycle Proteins and the Pathogenesis of HIV-1 Encephalitis in the HAART Era, p 231-244. In Goodkin K, Shapshak P, Verma A (ed), The Spectrum of Neuro-AIDS Disorders. ASM Press, Washington, DC. doi: 10.1128/9781555815691.ch17
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Tables

Generic image for table
TABLE 1

Summary of neuronal insults in which p53 levels are induced and/or required for cell death

Citation: Jordan-Sciutto K, Akay C. 2009. Cell Cycle Proteins and the Pathogenesis of HIV-1 Encephalitis in the HAART Era, p 231-244. In Goodkin K, Shapshak P, Verma A (ed), The Spectrum of Neuro-AIDS Disorders. ASM Press, Washington, DC. doi: 10.1128/9781555815691.ch17
Generic image for table
TABLE 2

Summary of cellular processes required for changes in ppRb and E2F1 localization and/or levels

Citation: Jordan-Sciutto K, Akay C. 2009. Cell Cycle Proteins and the Pathogenesis of HIV-1 Encephalitis in the HAART Era, p 231-244. In Goodkin K, Shapshak P, Verma A (ed), The Spectrum of Neuro-AIDS Disorders. ASM Press, Washington, DC. doi: 10.1128/9781555815691.ch17

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