Antioxidative and Anti-photooxidative Potential of Interruptins from the Edible Fern Cyclosorus terminans in Human Skin Cells.

Background: Human skin is exposed daily to oxidative stress factors such as UV light, chemical pollutants, and invading organisms. Reactive oxygen species (ROS) are intermediate molecules that cause cellular oxidative stress. In order to survive in an oxygen-rich environment, all aerobic organisms, including mammals, have evolved enzymatic and non-enzymatic defence systems. The interruptins from an edible fern Cyclosorus terminans possess antioxidative properties and can scavenge intracellular ROS in adipose-derived stem cells.

Objectives: This study aimed to evaluate the antioxidative efficacy of interruptins A, B, and C in cultured human dermal fibroblasts (HDFs) and epidermal keratinocytes (HEKs). Moreover, the anti-photooxidative activity of interruptins in ultraviolet (UV)-exposed skin cells was investigated.

Methods: The intracellular ROS scavenging capacity of interruptins in skin cells was measured by flow cytometry. Their induction effects on gene expression of the endogenous antioxidant enzymes was monitored using real-time polymerase chain reaction.

Results: Interruptins A and B, but not interruptin C, were highly effective in ROS scavenging, particularly in HDFs. Interruptins A and B upregulated gene expression of superoxide dismutase (SOD)1, SOD2, catalase (CAT), and glutathione peroxidase (GPx) in HEKs, but they only induced SOD1, SOD2, and GPx gene expression in HDFs. Additionally, interruptins A and B efficiently suppressed UVA- and UVB-induced ROS generation in both HEKs and HDFs.

Conclusion: The results suggest that these naturally occurring interruptins A and B are potent natural antioxidants and therefore may have the potential in the future of inclusion in antiaging cosmeceutical products.

Reduction of lauric acid content in virgin coconut oil improved plasma lipid profile in high-fat diet-induced hypercholesterolemic mice.

Virgin coconut oil (VCO) is claimed to have various health benefits, but favorable effects of its major component (∼50%), lauric acid, are controversial. Therefore, we aimed to reduce lauric acid content (∼30%) in VCO and evaluate its effect compared to VCO and medium-chain triglycerides (MCT), on food intake, bodyweight (BW), lipid profiles, and hepatic histology. Female C57BL/6 mice were treated with different diets for 3 months: control (normal diet), high-fat diet (HF), HF + VCO, HF + MCT, HF + low lauric acid VCO (LLA), and normal diet + LLA (C + LLA). LLA was prepared by enzymatic interesterification of VCO with methyl octanoate (methyl caprylate) and methyl decanoate (methyl caprate). Plasma and liver lipids, including total cholesterol (TC), high-density lipoprotein (HDL), and triglyceride, were measured by colorimetric assay, and hepatic fat accumulation was examined by oil-red-O staining. HF mice exhibited high plasma and liver TC and low-density lipoprotein (LDL). VCO or MCT treatment lowered liver TC and LDL, whereas LLA increased plasma HDL and markedly improved TC:HDL ratio. The HF-induced hepatic fat accumulation was attenuated by all treatments, of which VCO was the most effective. Control mice administered with LLA demonstrated lower liver TC and LDL, but higher plasma TC and HDL compared to controls. Lowest BW gain and food intake were found in mice treated with LLA. In conclusion, VCO, MCT, and LLA ameliorated hepatic histopathology caused by HF. VCO and MCT improved liver lipid profiles, whereas LLA has more beneficial effect on plasma lipids via a better TC:HDL ratio and showed promise for BW control.

Dried mulberry fruit ameliorates cardiovascular and liver histopathological changes in high-fat diet-induced hyperlipidemic mice.

BACKGROUND AND AIM: Metabolic disease encompasses most contemporary non-communicable diseases, especially cardiovascular and fatty liver disease. Mulberry fruits of Morus alba L. are a favoured food and a traditional medicine. While they are anti-atherosclerotic and reduce hyperlipidemic risk factors, studies need wider scope that include ameliorating cardiovascular and liver pathologies if they are to become clinically effective treatments. Therefore, the present study sought to show that freshly dried mulberry fruits (dMF) might counteract the metabolic/cardiovascular pathologies in mice made hyperlipidemic by high-fat diet (HF). EXPERIMENTAL PROCEDURE: C57BL/6J mice were fed for 3 months with either: i) control diet, ii) HF, iii) HF+100 mg/kg dMF, or iv) HF+300 mg/kg dMF. Body weight gain, food intake, visceral fat accumulation, fasting blood glucose, plasma lipids, and aortic, heart, and liver histopathologies were evaluated. Adipocyte lipid accumulation, autophagy, and bile acid binding were also investigated. RESULTS AND CONCLUSION: HF increased food intake, body weight, visceral fat, plasma total cholesterol (TC) and low-density lipoprotein (LDL), TC/HDL ratio, blood glucose, aortic collagen, arterial and cardiac wall thickness, and liver lipid. Both dMF doses prevented hyperphagia, body weight gain, and visceral fat accumulation, lowered blood glucose, plasma TG and unfavourable TC/HDL and elevated plasma HDL beyond baseline. Arterial and cardiac wall hypertrophy, aortic collagen fibre accumulation and liver lipid deposition ameliorated in dMF-fed mice. Clinical trials on dMF are worthwhile but outcomes should be holistic commensurate with the constellation of disease risks. Here, dMF should supplement the switch to nutrient-rich from current energy-dense diets that are progressively crippling national health systems.

Molecular characterization of hepatitis C virus genotype 6 subtypes in Thai blood donors.

BACKGROUND: Hepatitis C virus (HCV) genotype is important for identifying effective antiviral therapy, evaluating pathogenic severity, and tracking transmission routes. In Thailand, HCV genotypes 3 and 1 are the most common. We have previously demonstrated an increasing appearance of genotype 6 in HCV infections in Thailand. However, only limited epidemiological data on genotype 6 in Thailand are available. This study aimed to characterize HCV genotype 6 among apparently healthy Thai blood donors. METHODS: In total, 240 blood samples were collected from Phitsanulok Regional Blood Center, Phitsanulok, Thailand. RNA was reverse transcribed and amplified by the nested polymerase chain reaction. HCV genotyping was performed by direct sequencing and phylogenetic tree analysis of core sequences. Amino acid polymorphism of various subtypes of HCV genotype 6 was investigated. RESULTS: Of the 240 samples, 192 were successfully sequenced for the core region and 84 were determined to be of HCV genotype 6 by phylogenetic analysis. The most prevalent HCV-6 subtypes were 6f > 6n > 6c > 6i. Amino acid sequences of the partial core region among these four subtypes differed by one to seven residues. CONCLUSION: For HCV-6, the subtype 6f was commonly found in Thai blood donors. Comparison of core protein from various HCV-6 subtypes showed substantial polymorphisms, which may form the basis of future studies using samples from patients with clear HCV histories. This feature can be applied to therapies tailored to particular genotype variants.

Characterization of partial NS5B region among hepatitis C virus genotype 6 subtypes isolated from Thai blood donors.

The hepatitis C virus (HCV) is an important cause of liver dysfunction which continues to spread in Thailand, particularly as genotype 6. The NS5B gene fragment is particularly variable and thus provides a valuable tracker for its spread. Therefore, the purpose of this study was to characterize the HCV genotype 6 based on partial NS5B region using Thai blood donor samples. Twenty-nine samples were genotyped as HCV 6 by nested PCR, nucleotide sequencing and amino acid sequence analysis. Amplified products were identified as HCV genotypes 6f, 6c, 6n, and 6i. There were amino acid variations of 4-18 residues in subtypes 6f, 6c, and 6n whereas subtype 6i was conserved when compared with their referent strains. In subtypes 6f, 6c, 6n, and 6i, the amino acid mutations at positions 244, 309, and 310 which are associated with HCV resistance were present. In summary, the sequences and phylogenetic analysis of NS5B of HCV used in our study yielded the genotypes 6f, 6c, 6n, and 6i. This finding indicates diversity of amino acids in NS5B of HCV. Characterizing the partial NS5B region among hepatitis C virus genotype 6 subtypes may predict efficacious anti-HCV therapy. J. Med. Virol. 88:1785-1790, 2016. © 2016 Wiley Periodicals, Inc.