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Apoptosis-inducing factor
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Apoptosis-inducing factor : ウィキペディア英語版
Apoptosis-inducing factor

Apoptosis inducing factor is a flavoprotein.
Apoptosis inducing factor is involved in initiating a caspase-independent pathway of apoptosis (positive intrinsic regulator of apoptosis) by causing DNA fragmentation and chromatin condensation. It also acts as an NADH oxidase. Another AIF function is to regulate the permeability of the mitochondrial membrane upon apoptosis. Normally it is found behind the outer membrane of the mitochondria and is therefore secluded from the nucleus. However, when the mitochondrion is damaged, it moves to the cytosol and to the nucleus. Inactivation of AIF leads to resistance of embryonic stem cells to death following the withdrawal of growth factors indicating that it is involved in apoptosis.〔
== Function ==

Apoptosis Inducing Factor (AIF) is a protein that triggers chromatin condensation and DNA fragmentation in a cell in order to induce programmed cell death. The mitochondrial AIF protein was found to be a caspase-independent death effector that can allow independent nuclei to undergo apoptotic changes. The process triggering apoptosis starts when the mitochondria releases AIF, which exits through the mitochondrial membrane, enters the cytosol, and finally ends up in the cell nucleus where it signals the cell to condense its chromosomes and fragment its DNA molecules in order to prepare for cell death. Recently, researchers have discovered that AIF's activity is dependent upon the type of cell, the apoptotic insult, and its DNA-binding ability. AIF also plays a significant role in the mitochondrial respiratory chain and metabolic redox reactions.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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