Elevated calprotectin in patients with atrial fibrillation with and without heart failure.

Calprotectin is an inflammatory marker, which has been found elevated in patients suffering from cardiac conditions, e.g. myocardial infarction, unstable angina and chronic heart failure. Inflammation has further been linked to atrial fibrillation (AF). However, the association between calprotectin and AF is unknown. We aimed to compare calprotectin levels in patients suffering from AF with healthy adults. In addition, AF patients with and without heart failure were compared. Calprotectin was measured in patients undergoing elective direct current cardioversion for AF. Calprotectin was determined before, 4 hours and 3 months after cardioversion. Healthy blood donors were used to verify the reference interval for calprotectin. In total, 104 prospectively enrolled patients were included. The median serum calprotectin level for AF patients was 1.6 µg/mL before cardioversion. Calprotectin levels increased significantly 4 h (1.9 µg/mL) and 3 months (2.2 µg/mL) after cardioversion. Blood donors' median serum calprotectin (1.3 µg/mL) was significantly lower than AF patients. AF patients with heart failure had significantly higher calprotectin at baseline compared with AF patients without a history of heart failure (2.0 µg/mL vs. 1.5 µg/mL). The difference was not significant at 4 h (2.0 µg/mL vs. 1.7 µg/mL) or 3 months (2.5 µg/mL vs. 2.2 µg/mL). In conclusion, the calprotectin levels in patients with AF were significantly higher than healthy blood donors and were further increased after cardioversion. AF patients with heart failure had significantly higher levels of calprotectin than AF patients without heart failure.

Dietary Red Meat Adversely Affects Disease Severity in a Pig Model of DSS-Induced Colitis Despite Reduction in Colonic Pro-Inflammatory Gene Expression.

Diet plays a substantial role in the pathogenesis and management of ulcerative colitis (UC), and epidemiologic studies indicate an association between red meat intake and increased risk of UC development. Therefore, we evaluated the effect of a red meat diet on dextran sulfate sodium (DSS)-induced colitis in pigs. Weaned pigs (42 days old) were fed either a control diet or a diet substituted with 15% minced, cooked and dried beef from experimental day 0 to 14. From day 14 to 18, half of the pigs on each diet received a daily oral dose of DSS. Dietary red meat aggravated the severity of colitis based on clinical signs of disease (negative performance score) and histopathological parameters in the colon such as erosion/ulceration and the overall inflammation score but no negative effects were observed on systemic health or small intestinal permeability. Importantly, dietary meat also caused a potential beneficial reduction in the colonic expression of the pro-inflammatory cytokines IL-17A and IL-6, the pro-inflammatory enzyme PTGS2 and in the chemokine IL-8. The present study emphasizes the potential of diet to modulate mucosal inflammation and that a red meat diet might be a risk factor for the development of inflammatory bowel disease.