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Systemic scleroderma, or systemic sclerosis, is an autoimmune rheumatic disease characterised by excessive production and accumulation of collagen, called fibrosis, in the skin and internal organs and by injuries to small arteries. There are two major subgroups of systemic sclerosis based on the extent of skin involvement: limited and diffuse.
The PI3K/AKT pathway is crucial in this decision making process. NSCs are able to sense and respond to changes in the brain or throughout the organism. When blood glucose levels are elevated acutely, insulin is released from the pancreas. Activation of insulin receptors activates the PI3K/AKT pathway, which promotes proliferation. [3]
Primary lateral sclerosis, progressive muscle weakness in the voluntary muscles. Primary sclerosing cholangitis, a hardening of the bile duct by scarring and repeated inflammation. Systemic sclerosis (progressive systemic scleroderma), a rare, chronic disease which affects the skin, and in some cases also blood vessels and internal organs.
The scars are diffuse with inflammation, distal oligodendrogliopathy, microglial activation and loss of myelin-associated glycoprotein (MAG). It is considered atypical and an overlap between MS and Balo concentric sclerosis. The scars do not surround the blood vessels, and a rim of preserved myelin appears around the vessels.
In cell biology, there are a multitude of signalling pathways. Cell signalling is part of the molecular biology system that controls and coordinates the actions of cells.. Akt/PKB signalling pathway
HLA-DR2 (DR15 and DR16) are associated with scleroderma and systemic sclerosis. It has been found that patients with ATA that recognize the ET4 domain of topoisomerase were frequently HLA-DR2, [ 12 ] and in another population study it was found that DR-15 is associated with ATA in systemic sclerosis. [ 13 ]
As of 2012, the five-year survival rate for systemic scleroderma was about 85%, whereas the 10-year survival rate was just under 70%. [44] This varies according to the subtype; while localized scleroderma rarely results in death, the systemic form can, and the diffuse systemic form carries a worse prognosis than the limited form.
Examples of feedback control in the PI3K-Akt Pathway. The PI3K-Akt pathway has many downstream effects and must be carefully regulated. One of the ways the pathway is negatively regulated is by reducing PIP 3 levels. Phosphatase and tensin homolog (PTEN) antagonises PI3K by converting PI(3,4,5)P 3 into PI(4,5)P 2.