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[Opposite effect of lipofuscin granules and melanosomes from human retinal pigment epithelium of eye on photooxidation of cardiolipin]. 1999

A E Dontsov, and N L Sakina, and M A Ostrovskiĭ
Emanuel Institute of Biochemical Physics, Russian Academy of Sciences, Moscow, Russia.

The influence of lipofuscin granules and melanosomes from human retinal pigment epithelium on the light-induced photooxidation of cardiolipin liposomes and the generation of superoxide radicals was studied. Lipofuscin granules were able to stimulate, while melanosomes inhibited, the cardiolipin photooxidation. The visible light irradiation of both melanosomes and lipofuscin granules generated superoxide radicals with mean rates of 1.5 nmole/min/10(7) and 38 nmole/min/10(7) granules, accordingly. However, melanosomes but not lipofuscin granules reacted readily with superoxide radicals. Moreover, the rate constant of degradation of superoxide radicals in the presence of melanosomes was about five orders of magnitude higher than the rate constant of its photogeneration. Therefore, we propose that melanosomes in retinal pigment epithelium cells have a photoprotective role whereas lipofuscin granules may stimulate photodestructive reactions.

UI MeSH Term Description Entries
D007700 Kinetics The rate dynamics in chemical or physical systems.
D008062 Lipofuscin A naturally occurring lipid pigment with histochemical characteristics similar to ceroid. It accumulates in various normal tissues and apparently increases in quantity with age.
D008081 Liposomes Artificial, single or multilaminar vesicles (made from lecithins or other lipids) that are used for the delivery of a variety of biological molecules or molecular complexes to cells, for example, drug delivery and gene transfer. They are also used to study membranes and membrane proteins. Niosomes,Transferosomes,Ultradeformable Liposomes,Liposomes, Ultra-deformable,Liposome,Liposome, Ultra-deformable,Liposome, Ultradeformable,Liposomes, Ultra deformable,Liposomes, Ultradeformable,Niosome,Transferosome,Ultra-deformable Liposome,Ultra-deformable Liposomes,Ultradeformable Liposome
D008875 Middle Aged An adult aged 45 - 64 years. Middle Age
D010084 Oxidation-Reduction A chemical reaction in which an electron is transferred from one molecule to another. The electron-donating molecule is the reducing agent or reductant; the electron-accepting molecule is the oxidizing agent or oxidant. Reducing and oxidizing agents function as conjugate reductant-oxidant pairs or redox pairs (Lehninger, Principles of Biochemistry, 1982, p471). Redox,Oxidation Reduction
D010777 Photochemistry A branch of physical chemistry which studies chemical reactions, isomerization and physical behavior that may occur under the influence of visible and/or ultraviolet light. Photochemistries
D010857 Pigment Epithelium of Eye The layer of pigment-containing epithelial cells in the RETINA; the CILIARY BODY; and the IRIS in the eye. Eye Pigment Epithelium
D002308 Cardiolipins Acidic phospholipids composed of two molecules of phosphatidic acid covalently linked to a molecule of glycerol. They occur primarily in mitochondrial inner membranes and in bacterial plasma membranes. They are the main antigenic components of the Wassermann-type antigen that is used in nontreponemal SYPHILIS SERODIAGNOSIS. Cardiolipin,Diphosphatidylglycerol,Diphosphatidylglycerols
D003594 Cytoplasmic Granules Condensed areas of cellular material that may be bounded by a membrane. Cytoplasmic Granule,Granule, Cytoplasmic,Granules, Cytoplasmic
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man

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