Effects of high-fat diets on inflammation and antioxidant status in rats : comparison between palm olein and olive oil.

Palm olein (PO) and olive oil (OO) are widely consumed in the world. PO is considered harmful to health, whereas OO is considered healthy. The aim of the study was to compare the effects of consumption of these oils on antioxidant status and inflammation in rats. This was an experimental study in male wistar rats fed a diet containing 30% of each oil. Rats had free access to food and water. After being fed for 12 weeks, animals were sacrificed and liver and aortic blood were collected. Plasma was used for the determination of interleukin-6 (IL-6) and oxidative stress parameters (Superoxide dismutase -SOD; Gluthation peroxidase - GPx; Thiobarbituric acid reactive substances - TBARS; Thiol groups and isoprostane). The inflammation and oxidative stress status as well as the expression of several genes/proteins were also analyzed in liver homogenate. No significant differences were observed between PO and OO in plasma and liver levels of the studied inflammation and oxidative stress parameters. This study showed that the consumption of PO induces an antioxidant status superimposable to that of OO.   Key words : Palm olein - Olive oil - Oxidative stress - Inflammation - High fat diet.

Impact of diets rich in olive oil, palm oil or lard on myokine expression in rats.

It has recently emerged that myokines may be an important skeletal muscle adaptive response to obesogenic diets in sedentary subjects (who do not exercise). This study aimed to assess the influence of various high fat (HF) diets rich in either crude palm oil (cPO), refined palm oil (rPO), olive oil (OO) or lard on the modulation of myokine gene expression in the gastrocnemius. Five groups of 8 rats were each fed HF or control diet for 12 weeks. Systemic parameters concerning glucose, insulin, inflammation, cholesterol, triglycerides (TG) and transaminases were assessed by routine methods or ELISA. Akt and ACC phosphorylation were analyzed by WB in the soleus. Mitochondrial density, inflammation, and the gene expression of 17 myokines and the apelin receptor (Apj) were assessed by qPCR in the gastrocnemius. We found that HF diet-fed rats were insulin resistant and Akt phosphorylation decreased in the soleus muscle, but without any change in Glut4 gene expression. Systemic (IL-6) and muscle inflammation (NFκB and IκB) were not affected by the HF diets as well as TBARS, and ASAT level was enhanced with OO diet. Soleus pACC phosphorylation and gastrocnemius mitochondrial density were not significantly altered. The gene expression of some myokines was respectively increased (myostatin and Il-15) and decreased (Fndc5 and apelin) with the HF diets, whatever the type of fat used. The gene expression of two myokines with anti-inflammatory properties, Il-10 and myonectin, was dependent on the type of fat used and was most increased respectively with cPO or both rPO and OO diets. In conclusion, high-fat diets can differentially modulate the expression of some myokines, either in a dependent manner or independently of their composition.

[Interest of microalbuminuria in preventing kidney damage during systemic lupus erythematosus (SLE) under corticoid therapy]. / Intérêt de la microalbuminurie dans la prévention des atteintes rénales au cours du lupus érythémateux disséminé (LED) sous corticothérapie.

This study aimed to evaluate the benefits of microalbuminuria in preventing kidney damage in systemic lupus erythemathosus. This was a prospective study of 6 months has focused on 25 patients of both sexes aged over 14 with SLE whose diagnosis was based on the criteria of the American College of Rheumatology, having a negative proteinuria at the dipstick (Ketodiastix(®)) and a balance sheet normal renal (creatinine and uraemia normal). Each month, samples of venous blood were achieved at the elbow in patients fasted for the night (12pm). The serum obtained was used for measurement of creatinine and urea, according to conventional methods, by a Hitachi 902(®) automated random type. The determination of urinary albumin by immuno-nephelometric method (Hitachi 902(®)), in search of microalbuminuria has involved the collection of urine over 24 hours in a sterile jar containing crystals of thymol as an antiseptic. In the presence of microalbuminuria, the dose of prednisone was progressively increased by 5 mg until no microalbuminuria. We found: 1) that creatinine and blood urea remained normal during the 6 months of study, 2) the disappearance of microalbuminuria first two months after increasing the daily dose of corticosteroid with a significant decrease of albuminuria from day 0 to day 180 (p = 0.001, day 180 vs day 0), 3) a female predominance with a sex ratio of 0.13. In conclusion, the regular dosage and systematic albuminuria to microalbuminuria appears to be a reliable means for diagnosis of lupus glomerulonephritis in the subclinical stage to prevent renal complications that occur during the Supported Lupus erythematosus.