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Chen P.,Jiangnan University | Chen P.,Shaanxi University of Technology | Zhang Q.,Jiangnan University | Dang H.,Jiangnan University | And 9 more authors.
Journal of Functional Foods | Year: 2014

In this study, the effects of Lactobacillus rhamnosus CCFM0528, a new probiotic strain isolated by our laboratory, on glucose tolerance, hyperglycemia and cytokine secretion in high-fat-fed, streptozotocin-induced type 2 diabetic mice were studied. The results indicate that L.rhamnosus CCFM0528 significantly decreased fasting and postprandial 2-h blood glucose, glycosylated hemoglobin (HbA1c), endotoxin, tumor necrosis factor-α (TNF-α), interleukin-6 (IL-6), and interleukin-8 (IL-8) levels compared with the control group (. P <. 0.05). However, the values for insulin, glycogen, interleukin-4 (IL-4), and interleukin-10 (IL-10) were effectively increased at 13 weeks (. P <. 0.05). The cytokine gene expressions in spleen were regulated, and the islet cells were protected by L.rhamnosus CCFM0528. These findings demonstrated the antidiabetic effect of L.rhamnosus CCFM0528 on mice with type 2 diabetic induced by a high-fat diet and streptozotocin. Our study suggested that L.rhamnosus CCFM0528 may be a promising therapeutic agent in treating type 2 diabetes. © 2014 Elsevier Ltd.


Ren C.,Jiangnan University | Zhang Q.,Jiangnan University | Wang G.,Jiangnan University | Ai C.,Jiangnan University | And 10 more authors.
Applied Microbiology and Biotechnology | Year: 2014

Peanut allergy (PNA) has becoming a non-negligible health concern worldwide. Thus far, allergen-specific immunotherapy aimed at inducing mucosal tolerance has widely been regarded as a major management strategy for PNA. The safety profiles and the intrinsic probiotic properties of lactic acid bacteria (LAB) render them attractive delivery vehicles for mucosal vaccines. In the present study, we exploited genetically modified Lactococcus lactis to produce peanut allergen Ara h 2 via different protein-targeting systems and their immunomodulatory potency for allergic immune responses in mice were investigated. By comparison with the strain expressing the cytoplasmic form of Ara h 2 (LL1), the strains expressing the secreted and anchored forms of Ara h 2 (LL2 and LL3) were more potent in redirecting a Th2-polarized to a non-allergic Th1 immune responses. Induction of SIgA and regulatory T cells were also observed at the local levels by orally administration of recombinant L. lactis. Our results indicate that allergen-producing L. lactis strains modulated allergic immune responses and may be developed as promising mucosal vaccines for managing allergic diseases. © 2014 Springer-Verlag.


Tang X.,Jiangnan University | Zhang H.,Jiangnan University | Chen H.,Jiangnan University | Chen H.,Synergistic Innovation Center for Food Safety and Nutrition | And 5 more authors.
Current Microbiology | Year: 2014

Twenty standard amino acids were examined as single nitrogen source on the growth, total fatty acids production, and yield of γ-linolenic acid (GLA) in Mucor circinelloides. Of the amino acids, tyrosine gave the highest biomass and lipid accumulation and thus resulted in a high GLA yield with respective values of 17.8 g/L, 23 % (w/w, dry cell weight, DCW), and 0.81 g/L, which were 36, 25, and 72 % higher than when the fungus was grown with ammonium tartrate. To find out the potential mechanism underlying the increased lipid accumulation of M. circinelloides when grown on tyrosine, the activity of lipogenic enzymes of the fungus during lipid accumulation phase was measured. The enzyme activities of glucose 6-phosphate dehydrogenase, 6-phosphogluconate dehydrogenase, and ATP-citrate lyase were up-regulated, while NADP-isocitrate dehydrogenase was down-regulated by tyrosine during the lipid accumulation phase of the fungus which suggested that these enzymes may be involved in the increased lipid biosynthesis by tyrosine in this fungus. © 2014, Springer Science+Business Media New York.


Tang X.,Jiangnan University | Zhao L.,Jiangnan University | Chen H.,Jiangnan University | Chen H.,Synergistic Innovation Center for Food Safety and Nutrition | And 6 more authors.
PLoS ONE | Year: 2015

The genome of a high lipid-producing fungus Mucor circinelloides WJ11 (36% w/w lipid, cell dry weight, CDW) was sequenced and compared with that of the low lipid-producing strain, CBS 277.49 (15% w/w lipid, CDW), which had been sequenced by Joint Genome Institute. The WJ11 genome assembly size was 35.4 Mb with a G+C content of 39.7%. The general features of WJ11 and CBS 277.49 indicated that they have close similarity at the level of gene order and gene identity. Whole genome alignments with MAUVE revealed the presence of numerous blocks of homologous regions and MUMmer analysis showed that the genomes of these two strains were mostly co-linear. The central carbon and lipid metabolism pathways of these two strains were reconstructed and the numbers of genes encoding the enzymes related to lipid accumulation were compared. Many unique genes coding for proteins involved in cell growth, carbohydrate metabolism and lipid metabolism were identified for each strain. In conclusion, our study on the genome sequence of WJ11 and the comparative genomic analysis between WJ11 and CBS 277.49 elucidated the general features of the genome and the potential mechanism of high lipid accumulation in strain WJ11 at the genomic level. The different numbers of genes and unique genes involved in lipid accumulation may play a role in the high oleaginicity of strain WJ11. © 2015 Tang et al.


Zhai Q.,Jiangnan University | Wang G.,Jiangnan University | Zhao J.,Jiangnan University | Liu X.,Jiangnan University | And 7 more authors.
Applied and Environmental Microbiology | Year: 2014

Our previous study confirmed the ability of Lactobacillus plantarum CCFM8610 to protect against acute cadmium (Cd) toxicity in mice. This study was designed to evaluate the protective effects of CCFM8610 against chronic Cd toxicity in mice and to gain insights into the protection mode of this strain. Experimental mice were divided into two groups and exposed to Cd for 8 weeks via drinking water or intraperitoneal injection. Both groups were further divided into four subgroups, control, Cd only, CCFM8610 only, and Cd plus CCFM8610. Levels of Cd were measured in the feces, liver, and kidneys, and alterations of several biomarkers of Cd toxicity were noted. The results showed that when Cd was introduced orally, cotreatment with Cd and CCFM8610 effectively decreased intestinal Cd absorption, reduced Cd accumulation in tissue, alleviated tissue oxidative stress, reversed hepatic and renal damage, and ameliorated the corresponding histopathological changes. When Cd was introduced intraperitoneally, administration of CCFM8610 did not have an impact on tissue Cd accumulation or reverse the activities of antioxidant enzymes. However, CCFM8610 still offered protection against oxidative stress and reversed the alterations of Cd toxicity biomarkers and tissue histopathology. These results suggest that CCFM8610 is effective against chronic cadmium toxicity in mice. Besides intestinal Cd sequestration, CCFM8610 treatment offers direct protection against Cd-induced oxidative stress. We also provide evidence that the latter is unlikely to be mediated via protection against Cd-induced alteration of antioxidant enzyme activities. © 2014, American Society for Microbiology.


Hao G.,Jiangnan University | Chen H.,Jiangnan University | Chen H.,Synergistic Innovation Center for Food Safety and Nutrition | Wang L.,Nankai University | And 9 more authors.
Applied and Environmental Microbiology | Year: 2014

The generation of NADPH by malic enzyme (ME) was postulated to be a rate-limiting step during fatty acid synthesis in oleaginous fungi, based primarily on the results from research focusing on ME in Mucor circinelloides. This hypothesis is challenged by a recent study showing that leucine metabolism, rather than ME, is critical for fatty acid synthesis in M. circinelloides. To clarify this, the gene encoding ME isoform E from Mortierella alpina was homologously expressed. ME overexpression increased the fatty acid content by 30% compared to that for a control. Our results suggest that ME may not be the sole rate-limiting enzyme, but does play a role, during fatty acid synthesis in oleaginous fungi. © 2014, American Society for Microbiology.


He Z.,Jiangnan University | He Z.,Synergistic Innovation Center for Food Safety and Nutrition | Feng G.-S.,University of California at San Diego
Reviews in Endocrine and Metabolic Disorders | Year: 2013

Improper body weight control is most critical to the development of morbid obesity, which is often associated with alternation in leptin (Ob) signaling in the central nervous system. Leptin acts to control fat mass through the regulation of both food intake and energy expenditure. In addition to the primary action in metabolic signaling, leptin has also been found to play a role in reproduction and even in breast tumorigenesis in obese patients. Interestingly, estrogen, a sex hormone, has also been recognized as another crucial factor for energy balance and breast tumorigenesis in obese subjects. Obesity in postmenopausal women has been associated with higher risk of breast cancer. There are substantial data in the literature on the connection of estrogen and leptin pathways in development of obesity and breast cancer. In this review, we discuss the cross-talk of leptin and estrogen signaling pathways in body weight control and breast cancer development. © 2013 Springer Science+Business Media New York.


Zhai Q.,Jiangnan University | Narbad A.,UK Institute of Food Research | Chen W.,Jiangnan University | Chen W.,Synergistic Innovation Center for Food Safety and Nutrition
Nutrients | Year: 2015

Cadmium (Cd) and lead (Pb) are toxic heavy metals that cause adverse health effects in humans and animals. Chelation therapy, the conventional treatment for heavy metal toxicity, is reported to have a number of safety and efficacy issues. Recent studies have shown that dietary supplements play important roles in protecting against Cd and Pb toxicity. This paper reviews the evidence for protective effects of essential metals, vitamins, edible plants, phytochemicals, probiotics and other dietary supplements against Cd and Pb toxicity and describes the proposed possible mechanisms. Based on these findings, dietary strategies are recommended for people at risk of Cd and Pb exposure. The application of these strategies is advantageous for both the prevention and alleviation of Cd and Pb toxicity, as such supplements can be added easily and affordably to the daily diet and are expected to have very few side effects compared to the chelation therapy. © 2015 by the authors; licensee MDPI, Basel, Switzerland.


Zhai Q.,Jiangnan University | Xiao Y.,Jiangnan University | Tian F.,Jiangnan University | Wang G.,Jiangnan University | And 7 more authors.
RSC Advances | Year: 2015

Our previous study confirmed that Lactobacillus plantarum CCFM8610 has protective effects against chronic cadmium (Cd) toxicity in mice, whereas L. bulgaricus CCFM8004 fails to provide similar protection. This study was designed to evaluate the protective effects of soymilk fermented with these lactic acid bacteria, against chronic Cd toxicity in mice, and to give an insight into the mechanism of the conjunct effect of soymilk and these strains. Experimental mice were divided into five groups as control, Cd only, non-fermented soymilk plus Cd, CCFM8610-fermented soymilk plus Cd, and CCFM8004-fermented soymilk plus Cd. The treatment of all groups was carried out for 8 weeks. Levels of Cd were measured in feces and tissues, and alterations in several biomarkers of Cd toxicity were noted. The results showed that non-fermented soymilk gave limited protection against chronic Cd toxicity in mice. However, oral administration of L. plantarum CCFM8610-fermented soymilk was able to increase fecal Cd excretion, reduce tissue Cd burden, alleviate tissue oxidative stress, reverse changes in hepatic and renal damage biomarkers, and ameliorate tissue histopathological changes in mice, indicating that L. plantarum CCFM8610-fermented soymilk could be considered as a dietary therapeutic strategy against chronic Cd toxicity. The treatment of L. bulgaricus CCFM8004-fermented soymilk provided similar protection, although the effects were less significant than for CCFM8610 treatment. The conjunct effects of the strains and the soymilk may be attributed to the increased Cd excretion ability and antioxidative capacity after fermentation. © The Royal Society of Chemistry 2015.


Hao G.,Jiangnan University | Chen H.,Jiangnan University | Chen H.,Synergistic Innovation Center for Food Safety and Nutrition | Du K.,Jiangnan University | And 11 more authors.
Biotechnology Letters | Year: 2014

Malic enzyme (ME) catalyses the oxidative decarboxylation of l-malate to pyruvate and provides NADPH for intracellular metabolism, such as fatty acid synthesis. Here, the mitochondrial ME (mME) gene from Mortierella alpina was homologously over-expressed. Compared with controls, fungal arachidonic acid (ARA; 20:4 n-6) content increased by 60 % without affecting the total fatty acid content. Our results suggest that enhancing mME activity may be an effective mean to increase industrial production of ARA in M. alpina. © 2014 Springer Science+Business Media Dordrecht.

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