Differential vulnerability of substantia nigra and corpus striatum to oxidative insult induced by reduced dietary levels of essential fatty acids

Frontiers in Human Neuroscience

Rafael Salomé Oliveira¹  Rubem Carlos Araújo Guedes¹  Cláudia Jacques Lagranha¹  David Filipe de Santana¹  Eraldo Fonseca Santos Junior¹  Daniela Maria do Amaral Ferraz Navarro¹  Geanne Karla Novais Santos¹  Belmira Lara Da Silveira Andrade- Da- Costa¹  Juliana Maria Carrazone Borba¹  Marcelo Cairrão Araújo Rodrigues¹  Priscila Pereira Passos¹  Pablo Emanuel Lisboa de Oliveira¹  Henriqueta Dias Cardoso¹  Janilson Félix da Silva¹  Rita de Cássia Farias Santos¹  Ana Paula eRocha-de-Melo¹  Eduardo Isidoro Beltrão¹  Anete C Ferraz²  Roseane eBorner³  Cristovam Wanderley Picanço Diniz³ 

[1] Universidade Federal de Pernambuco;Universidade Federal do Paraná;Universidade Federal do Pará;

关键词: Catalase;    Corpus Striatum;    Lipid Peroxidation;    Oxidative Stress;    Substantia Nigra;    Superoxide Dismutase;   

DOI  :  10.3389/fnhum.2012.00249

来源: DOAJ

【 摘 要 】

Oxidative stress (OS) has been implicated in the etiology of certain neurodegenerative disorders. Some of these disorders have been associated with unbalanced levels of essential fatty acids (EFA). The response of certain brain regions to OS, however, is not uniform and a selective vulnerability or resilience can occur. In our previous study on rat brains, we observed that a two-generation EFA dietary restriction reduced the number and size of dopaminergic neurons in the substantia nigra (SN) rostro-dorso-medial. To understand whether OS contributes to this effect, we assessed the status of lipid peroxidation and anti-oxidant markers in both SN and corpus striatum (CS) of rats submitted to this dietary treatment for one (F1) or two (F2) generations. Wistar rats were raised from conception on control or experimental diets containing adequate or reduced levels of linoleic and α-linolenic fatty acids, respectively. Lipid peroxidation (LP) was measured using the thiobarbituric acid reaction method (TBARS) and the total superoxide dismutase (t-SOD) and catalase (CAT) enzymatic activities were assessed. The experimental diet significantly reduced the docosahexaenoic acid levels of SN phospholipids in the F1 (~28%) and F2 (~50%) groups. In F1 adult animals of the experimental group there was no LP in both SN and CS. Consistently, there was a significant increase in the t-SOD activity (p<0.01) in both regions. In EF2 young animals, degeneration in dopaminergic and non-dopaminergic neurons and a significant increase in LP (p<0.01) and decrease in the CAT activity (p<0.001) were detected in the SN, while no inter-group difference was found for these parameters in the CS. Conversely, a significant increase in t-SOD activity (p<0.05) was detected in the CS of the experimental group compared to the control. The results show that unbalanced EFA dietary levels reduce the redox balance in the SN and reveal mechanisms of resilience in the CS under this stressful condition.

【 授权许可】

Unknown