Beijing Key Laboratory for Dairy Cow Nutrition

Beijing, China

Beijing Key Laboratory for Dairy Cow Nutrition

Beijing, China
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Liu X.,China Agricultural University | Liu X.,Beijing Key Laboratory for Dairy Cow Nutrition | Shi Y.,China Agricultural University | Shi Y.,Beijing Key Laboratory for Dairy Cow Nutrition | And 11 more authors.
International Journal of Hyperthermia | Year: 2014

Purpose: This study aimed to investigate immune-related gene expression in rat small intestine after heat stress. Materials and methods: Twelve Sprague Dawley (SD) rats were randomly divided into control and heat-stressed groups. Rats in both groups were housed at 25°C with 60% relative humidity. The heat-stressed group was subjected to 40°C for 2h/day for 3 days. After heat stress, the mRNA expression profile of small intestine epithelial tissue was evaluated by microarray analysis. Results: A total of 23 genes related to immune responses were significantly altered, of which 12 genes were up-regulated and 11 genes were down-regulated. Conclusions: Microarray analysis demonstrated the JAK-STAT pathway had a potentially important role in the regulation of inflammation in the small intestine, and changes in antigen presentation might reduce intestinal immune responses after heat stress. © 2014 Informa UK Ltd.

Xu X.,China Agricultural University | Li H.,Shanxi Agricultural University | Hou X.,China Agricultural University | Li D.,China Agricultural University | And 7 more authors.
Mediators of Inflammation | Year: 2015

Reactive oxygen species (ROS) and oxidative stress are thought to play a central role in potentiating macrophage activation, causing excessive inflammation, tissue damage, and sepsis. Recently, we have shown that punicalagin (PUN) exhibits anti-inflammatory activity in LPS-stimulated macrophages. However, the potential antioxidant effects of PUN in macrophages remain unclear. Revealing these effects will help understand the mechanism underlying its ability to inhibit excessive macrophage activation. Hemeoxygenase-1 (HO-1) exhibits antioxidant activity in macrophages. Therefore, we hypothesized that HO-1 is a potential target of PUN and tried to reveal its antioxidant mechanism. Here, PUN treatment increased HO-1 expression together with its upstream mediator nuclear factor-erythroid 2 p45-related factor 2 (Nrf2). However, specific inhibition of Nrf2 by brusatol (a specific Nrf2 inhibitor) dramatically blocked PUN-induced HO-1 expression. Previous research has demonstrated that the PI3K/Akt pathway plays a critical role in modulating Nrf2/HO-1 protein expression as an upstream signaling molecule. Here, LY294002, a specific PI3K/Akt inhibitor, suppressed PUN-induced HO-1 expression and led to ROS accumulation in macrophages. Furthermore, PUN inhibited LPS-induced oxidative stress in macrophages by reducing ROS and NO generation and increasing superoxide dismutase (SOD) 1 mRNA expression. These findings provide new perspectives for novel therapeutic approaches using antioxidant medicines and compounds against oxidative stress and excessive inflammatory diseases including tissue damage, sepsis, and endotoxemic shock. © 2015 Xiaolong Xu et al.

Wang J.,Zhejiang University | Liu M.,Zhejiang University | Wu Y.,Zhejiang University | Wang L.,Zhejiang University | And 3 more authors.
Applied Microbiology and Biotechnology | Year: 2016

Mitigation of the methane (CH4) emission from ruminants is needed to decrease the environmental impact of ruminant animal production. Different plant materials and chemicals have been tested, but few are both effective and practical. Medicinal herbs contain biological compounds and antimicrobials that may be effective in lowering the CH4 production. However, few studies have systematically evaluated medicinal herbs for their effect on CH4 production or on the rumen microbiota. In this study, extracts from 100 medicinal herbs were assessed for their ability to decrease CH4 production by rumen microbiota in vitro. The extracts of 12 herbs effectively lowered the CH4 production, with the extract of Perilla frutescens seeds being the most effective. The major components of P. frutescens seed extract were identified, and the effects of the extract on the fermentation characteristics and populations of rumen methanogens, fungi, protozoa, and select bacteria were also assessed. The decreased CH4 production induced by the P. frutescens seed extract was accompanied by an increased abundance of Ruminobacter, Selenomonas, Succinivibrio, Shuttleworthis, Pseudobutyrivbrio, Anaerovibrio, and Roseomonas and a decreased abundance of Methanobrevibacter millerae. The abundance of Pedobacter, Anaeroplasma, Paludibacter, Ruminococcus, and unclassified Lachnospiraceae was positively correlated with the CH4 production, with no effects on volatile fatty acids. This study suggests that medicinal herbs may be used to mitigate the CH4 emission from ruminants. © 2016 Springer-Verlag Berlin Heidelberg

PubMed | Beijing Key Laboratory for Dairy Cow Nutrition, Ohio State University and Zhejiang University
Type: Journal Article | Journal: Applied microbiology and biotechnology | Year: 2016

Mitigation of the methane (CH

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