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- W2143708081 abstract "Defects in apoptosis (programmed cell death) have recently emerged as being closely involved in the pathogenesis of most ocular diseases and, therefore, apoptosis is now a topic of exponential interest in ophthalmology. This review summarizes recent works on mechanisms of apoptosis, from its initiation and modulation to the switching-on of its execution machinery. Interactions of cell death with cell division programs to orchestrate ontogenesis, aging, and adult life and their alterations in human diseases are pointed out. Two main apoptotic signaling pathways are identified: a death receptor-dependent (extrinsic) pathway and a mitochondrion-dependent (intrinsic) pathway. Mitochondrion harbors both antiapoptotic (Bcl-2, Bcl-XL) and apoptotic factors (Smac/Diablo, Apaf-1, cytochrome c). Its permeability transition pore (mPTP) is the main trigger of cell suicide. The process of mPTP opening, in association with extrusion to cytoplasm of a variety of apoptotic factors, is shown. Cytochrome c is one of these apoptotic factors. When expelled to cytoplasm, this double-faced respiratory chain component assembles with two other modules, Apaf-1 and procaspase 9, to form a protein complex--the apoptosome--that starts apoptosis execution. Another respiratory chain component, the CoQ10, is believed to counteract mPTP opening. What makes apoptosis particularly exciting for medicine is that its dysfunctions play a central role in the pathogenesis of several human diseases. For instance, excesses of apoptosis lead to cell loss that accompanies neurodegenerative diseases, whereas genetically determined defects of apoptosis lead to the deregulated cell proliferation typical of cancer. A variety of ophthalmologic diseases, such as post-keratectomy haze, corneal lesions, cataract, glaucoma, senile maculopathies, and genetic ocular pathologies, that underlie apoptosis dysfunctions are treated in detail in the other reviews of this issue." @default.
- W2143708081 created "2016-06-24" @default.
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- W2143708081 date "2003-04-01" @default.
- W2143708081 modified "2023-10-17" @default.
- W2143708081 title "The Mechanisms of Apoptosis in Biology and Medicine: A New Focus for Ophthalmology" @default.
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- W2143708081 doi "https://doi.org/10.1177/112067210301303s03" @default.
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