Sıçanlarda sirkadiyen ritim bozuklukları ile ilgili çeşitli koşulların plazma ve eritrosit lipidleri üzerindeki etkileri: peroksizomal bir bakış açısı

Purpose: Lipidomics studies of sleep restriction, which is known to be associated with circadian perturbations, revealed alterations in some plasma phospholipid levels including plasmalogens which are partly synthesized in liver peroxisomes. To this end it was aimed to investigate effects of various conditions known to cause circadian rhythm disturbances on various peroxisomal parameters and to compare those effects with that of fenofibrate, a peroxisome proliferator-activated receptor alpha agonist. Materials and Methods: Plasmalogens and some fatty acids in erythrocyte lysates were analyzed by GC. Peroxisomal metabolites including very long chain fatty acids as well as phytanic and pristanic acids in plasma were measured by GC-MS. Immunohistological analyses by catalase antibodies were conducted on liver sections. Results: All the conditions tested exhibited increased catalase immunoreactivity in liver sections compared to that of controls. Both calorie restriction, time-restricted feeding, as well as fenofibrate treatment exhibited lower C18:0 plasmalogen contents of erythrocyte lysates. As plasmalogens are known to be synthesized by peroxisomes, the present results suggest that the peroxisomal lipid content in membranes might be affected by conditions co-occuring with circadian perturbations. Conclusion: Shared effects of conditions associated with circadian rhythm disturbances and peroxisomal induction by fenofibrate on erythrocyte membrane lipids might indicate a link between them.