title: Chronic iron overload induces gender-dependent changes in iron homeostasis, lipid peroxidation and clinical course of experimental autoimmune encephalomyelitis.
abstract: To analyze iron- and gender-dependent mechanisms possibly involved in pathogenesis of multiple sclerosis (MS) in this study we evaluated the effects of iron overload (IO) on iron status and lipid peroxidation processes (LPO) in tissues of female and male DA rats during chronic relapsing experimental autoimmune encephalomyelitis, a well-established MS animal model. Rats were treated by iron sucrose (75mg/kg bw/day) or with saline solution during two weeks before the sensitization with bovine brain homogenate in complete Freund's adjuvant. Clinical signs of EAE were monitored during 29 days. Serum and tissues of CNS and liver were sampled before immunization and at day 13th post immunization (during acute phase of EAE). The determination of ferritin, iron, malondialdehyde (MDA) and 4-hydroxynonenal (4-HNE) and evaluation of histopathology were performed by ELISA, ICP spectrometry and immunohistochemistry. Results showed that IO in female EAE rats accelerated the onset of disease. In contrast, in male rats it accelerated the progression of disease and increased the mortality rate. During acute phase of EAE female IO rats sequestered more Fe in the liver, spinal cord and in the brain and produced more ferritin than male EAE rats. Male rats, however, reacted on IO by higher production of MDA or 4-HNE in the neural tissues and showed greater signs of plaque formation and gliosis in spinal cord. The data point to sexual dimorphism in mechanisms that regulate peripheral and brain iron homeostasis and imply that men and women during MS might be differentially vulnerable to exogenous iron overload.
authors: Department of Physiology and Immunology, Medical Faculty, University of Rijeka, B. Branchetta 22, 51 000 Rijeka, Croatia.
authors: Božena
authors: B
authors: Ćurko-Cofek
authors: Department of Physiology and Immunology, Medical Faculty, University of Rijeka, B. Branchetta 22, 51 000 Rijeka, Croatia.
authors: Tanja Grubić
authors: TG
authors: Kezele
authors: Department of Chemistry and Biochemistry, Medical Faculty, University of Rijeka, B. Branchetta 22, 51 000 Rijeka, Croatia.
authors: Jelena
authors: J
authors: Marinić
authors: Department of Chemistry and Biochemistry, Medical Faculty, University of Rijeka, B. Branchetta 22, 51 000 Rijeka, Croatia.
authors: Marin
authors: M
authors: Tota
authors: Department of Biology and Medical Genetics, Medical Faculty, University of Rijeka, B. Branchetta 22, 51 000 Rijeka, Croatia.
authors: Nada Starčević
authors: NS
authors: Čizmarević
authors: Department of Chemistry and Biochemistry, Medical Faculty, University of Rijeka, B. Branchetta 22, 51 000 Rijeka, Croatia.
authors: Čedomila
authors: Č
authors: Milin
authors: Department of Biology and Medical Genetics, Medical Faculty, University of Rijeka, B. Branchetta 22, 51 000 Rijeka, Croatia.
authors: Smiljana
authors: S
authors: Ristić
authors: Department of Physiology and Immunology, Medical Faculty, University of Rijeka, B. Branchetta 22, 51 000 Rijeka, Croatia. Electronic address: biserkars@medri.uniri.hr.
authors: Biserka
authors: B
authors: Radošević-Stašić
authors: Department of Physiology and Immunology, Medical Faculty, University of Rijeka, B. Branchetta 22, 51 000 Rijeka, Croatia.
authors: Vesna
authors: V
authors: Barac-Latas
mesh_terms: D000818:Animals; D001921:Brain / Q000378:metabolism; D004195:Disease Models, Animal; D004681:Encephalomyelitis, Autoimmune, Experimental / Q000139:chemically induced* / Q000401:mortality / Q000503:physiopathology*; D005260:Female; D005293:Ferritins / Q000097:blood; D005620:Freund's Adjuvant / Q000276:immunology; D006706:Homeostasis / Q000276:immunology*; D007501:Iron / Q000378:metabolism*; D019190:Iron Overload / Q000150:complications*; D015227:Lipid Peroxidation / Q000187:drug effects / Q000276:immunology*; D008099:Liver / Q000378:metabolism; D008297:Male; D051381:Rats; D013116:Spinal Cord / Q000378:metabolism
chemical_list: D005293:Ferritins; D005620:Freund's Adjuvant; D007501:Iron
keywords: Brain; Chronic relapsing experimental autoimmune encephalomyelitis; Gender; Iron overload; Lipid peroxidation; Liver; Spinal cord