Correction: Curcumin attenuates iron accumulation and oxidative stress in the liver and spleen of chronic iron-overloaded rats.

[This corrects the article DOI: 10.1371/journal.pone.0134156.].

Calcification Assessment of Bioprosthetic Heart Valve Tissues Using an Improved In Vitro Model.

Calcification is a recurrent problem in patients suffering from heart valve disease and it is the main cause of failure in biological heart valve prostheses. The development of reliable calcification tests that consider both the material properties of the prostheses and the fluid composition is of paramount importance for the effective testing and subsequent selection of new cardiovascular implants. In this article, a fast, reliable, and highly reproducible method for the assessment of the calcification potential of biomaterials was developed. The developed method simulated closely the chemical environment in vivo, where the supersaturation levels of calcium and phosphate remain constant. Seeded hydroxyapatite (HAP) crystal growth experiments were used as the reference system and compared to the mineralization kinetics and extent of frozen untreated bovine and porcine pericardium, and glutaraldehyde-fixed bovine pericardium. Untreated pericardial patches did not calcify in the supersaturated calcium phosphate solutions whereas glutaraldehyde-fixed bovine pericardial patches mineralized at the same conditions. The present work suggested that the loose collagenous serosa side of the pericardium mineralized at lower rates compared to its dense collagenous fibrous side. Concordant with these findings, the mineralization of bioprostheses may also be attributed, to the structural deterioration of collagen-rich tissues, induced by chemical treatment used to control in vivo structural stability and immunomodulation of the implants.

Curcumin Attenuates Iron Accumulation and Oxidative Stress in the Liver and Spleen of Chronic Iron-Overloaded Rats.

OBJECTIVES: Iron overload is now recognized as a health problem in industrialized countries, as excessive iron is highly toxic for liver and spleen. The potential use of curcumin as an iron chelator has not been clearly identified experimentally in iron overload condition. Here, we evaluate the efficacy of curcumin to alleviate iron overload-induced hepatic and splenic abnormalities and to gain insight into the underlying mechanisms. DESIGN AND METHODS: Three groups of male adult rats were treated as follows: control rats, rats treated with iron in a drinking water for 2 months followed by either vehicle or curcumin treatment for 2 more months. Thereafter, we studied the effects of curcumin on iron overload-induced lipid peroxidation and anti-oxidant depletion. RESULTS: Treatment of iron-overloaded rats with curcumin resulted in marked decreases in iron accumulation within liver and spleen. Iron-overloaded rats had significant increases in malonyldialdehyde (MDA), a marker of lipid peroxidation and nitric oxide (NO) in liver and spleen when compared to control group. The effects of iron overload on lipid peroxidation and NO levels were significantly reduced by the intervention treatment with curcumin (P<0.05). Furthermore, the endogenous anti-oxidant activities/levels in liver and spleen were also significantly decreased in chronic iron overload and administration of curcumin restored the decrease in the hepatic and splenic antioxidant activities/levels. CONCLUSION: Our study suggests that curcumin may represent a new horizon in managing iron overload-induced toxicity as well as in pathological diseases characterized by hepatic iron accumulation such as thalassemia, sickle cell anemia, and myelodysplastic syndromes possibly via iron chelation, reduced oxidative stress derived lipid peroxidation and improving the body endogenous antioxidant defense mechanism.

Antioxidant, cytotoxic, antitumor, and protective DNA damage metabolites from the red sea brown alga Sargassum sp.

BACKGROUND: Macroalgae can be viewed as a potential antioxidant and anti-inflammatory sources owing to their capability of producing compounds for its protection from environmental factors such as heat, pollution, stress, oxygen concentration, and UV radiations. OBJECTIVE: To isolate major compounds which are mainly responsible for the pharmacological activity of brown alga under investigation, Sargassum sp. MATERIALS AND METHODS: Algal material was air dried, extracted with a mixture of organic solvents, and fractionated with different adsorbents. The structures of obtained pure compounds were elucidated with different spectroscopic techniques, and two pure materials were tested for protection of DNA from damage, antioxidant, antitumor, and cytotoxicity. RESULTS: Four pure compounds were obtained, of which fucosterol (1) and fucoxanthin (4) were tested; it was found that fucoxanthin has strong antioxidant and cytotoxicity against breast cancer (MCF-7) with IC(50) = 11.5 µg/ml. CONCLUSION: The naturally highly conjugated safe compound fucoxanthin could be used as antioxidant and as an antitumor compound.