Can lipofuscin accumulation be prevented?
During normal autophagic degradation of mitochondria and iron-containing proteins in lysosomes, iron is released intralysosomally where it may react with hydrogen peroxide forming hydroxyl radicals (Fenton reaction). Depending on their rate of formation, these highly reactive radicals can cross-link intralysosomal material, leading to lipofuscin formation, or destabilize the lysosomal membrane, which induces apoptosis/necrosis. Since the sensitivity of lysosomes to oxidative stress can be manipulated by altering the intralysosomal level of redox-active iron, it follows that lipofuscin formation might also be influenced. It is suggested that pulse doses of iron chelators that easily penetrate membranes could be used to diminish lipofuscinogenesis.
Kurz
Tino
T
Department of Pharmacology, Faculty of Health Sciences, Linköping University, Linköping, Sweden. tino.kurz@imv.liu.se
D000818:Animals; D002478:Cells, Cultured; D004705:Endocytosis; D005293:Ferritins / Q000378:metabolism; D005347:Fibroblasts / Q000166:cytology / Q000378:metabolism; D006736:Horses; D006801:Humans; D008062:Lipofuscin / Q000378:metabolism*; D018384:Oxidative Stress
D008062:Lipofuscin; D005293:Ferritins