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PGC-1 alpha: Roles in Mitochondrial Biogenesis and Disease

An important aspect of mitochondria maintenance includes biogenesis to replenish damaged and degraded mitochondrial structures. The regulation of mitochondrial biogenesis is very complex and numerous genes regulate and synchronize protein synthesis from the mitochondrial and nuclear genome.

O-GlcNAc, Glucose Deprivation and Cancer

O-linked beta-N-acetylglucosamine (O-GlcNAc) is a sugar attachment to serine or threonine hydroxyl moieties on nuclear and cytoplasmic proteins. O-GlcNAc modified proteins are generally either cytoplasmic or nuclear proteins, and unlike asparagine-linked or mucin-type O-glycosylation, O-GlcNAc is not further processed into a complex oligosaccharide.

AKAP95/AKAP8 Orchestrates and Synchronizes Cellular Events

A-kinase anchor proteins (AKAPs), such as AKAP95/AKAP8, are scaffold proteins that contain a binding domain for the RI/RII subunit of protein kinase A (PKA). AKAPs orchestrate and synchronize cellular events by tethering the cAMP-dependent PKA and other signaling enzymes to organelles and membranes. This gene encodes a nuclear A-kinase anchor protein that binds to the RII alpha subunit of PKA and may play a role in chromosome condensation during mitosis (1).

Cerebellar Degeneration-Related Protein 2 (CDR2): Cell-Cycle Regulated Tumor Antigen

CDR2 is a tumor antigen expressed in a high percentage of breast and ovarian tumors and is the target of a naturally occurring tumor immune response in patients with paraneoplastic cerebellar degeneration.

SOX2: an Important Stem Cell Transcription Factor

SOX2 is a transcription factor that is expressed by self-renewing and multipotent stem cells of the embryonic neuroepithelium. Sox-2 was found to be expressed by dividing neural progenitor cells. Constitutive expression of SOX2 has also been shown to inhibit neuronal differentiation and results in the maintenance of progenitor characteristics.

Mitofilin and the Mitochondrial Inner Membrane Organizing System (MINOS)

Mitofilin was originally described as a heart muscle protein due to its high expression in the heart. Recently, analysis of the human heart mitochondrial proteome demonstrated that Mitofilin is one of the most abundant mitochondrial proteins (1). Researchers have reported finding two alternately spliced Mitofilin variants producing proteins of 88 and 90 kDa, that were detected in immunoblots with Mitofilin antibodies (2).

Nucleus and Mitotic Apparatus (NuMA) Protein in Cell Cycle Regulation

NuMA, the major protein of the "Nucleus and Mitotic Apparatus", is a structural protein in vertebrates involved in cell cycle regulation. It localizes to the nucleus during interphase, and accumulates at the spindle poles during mitosis and NuMA has been implicated in the formation of the mitotic spindle, in particular in focusing the spindle poles (1).

p14 ARF is an Important Tumor Suppressor

The p14ARF (Alternative Reading Frame) tumor suppressor is a protein product of the alternative reading frame (ARF) of the human INK4a locus which regulates a series of cell cycle regulatory proteins to promote cell cycle arrest in response to abnormal hyper-proliferative growth stimuli. p14ARF alterations are common in human cancers and, when inherited, confer susceptibility to cutaneous melanoma (1).

Adhesion Receptor Molecule CD11b/c is the Point of Entry for many Infectious Diseases

Pathogenic microorganisms utilize a variety of cell surface receptors to gain entry into host cells and to bypass the natural defense mechanisms. One of the most prominent receptors used in this fashion is the leukocyte adhesion receptor CD11b/c.

Beta Amyloid Neurotoxicity and Alzheimer's Disease

A major histopathological hallmark of Alzheimer's disease (AD) is the presence of amyloid deposits in the parenchyma of the amygdala, hippocampus, and neocortex. The principal component of amyloid is beta amyloid (AB). The pathologic accumulation of AB in plaques is postulated to result from an imbalance between production and clearance during aging.

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