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Kunming, China

Wang L.,Yanan Hospital
Acta biochimica et biophysica Sinica | Year: 2013

Hepcidin is a key regulator of iron metabolism. The expression of hepcidin is significantly induced by iron overload, inflammation, and infection of pathogens. Recent studies have indicated that the expression of hepcidin in the liver is also regulated during liver regeneration. However, the mechanism of the regulation of hepcidin expression and its role in liver regeneration remain unclear. In this study, we found that the hepatocyte growth factor inhibited hepcidin expression in the liver during the late stage of liver regeneration. Meanwhile, we investigated the effect of hepcidin on liver regeneration. Mice overexpressing hepcidin-1 exhibited impaired hepatic regeneration after partial hepatectomy, as determined by immunohistochemical staining of the proliferation cell nuclear antigen. Our results demonstrated a negative role of hepcidin in modulating liver regeneration, and suggested that a sustained high iron level by the down-regulation of hepcidin at the late stage of liver regeneration is required for hepatocyte proliferation.

Niu S.,Kunming Medical University | Wang L.,Yanan Hospital | He M.,Kunming Medical University | Peng Y.,Kunming Medical University | Li S.,Kunming Medical University
Acta Biochimica et Biophysica Sinica | Year: 2015

Non-alcoholic fatty liver disease (NAFLD) is associated with increased plasma homocysteine level, which is caused by down-regulation of hepatic cystathionine beta-synthase (CBS) activity. CBS catalyzes the first step in the transsulfuration of homocysteine to cysteine, which contributes 50% of the cysteine required for hepatic biosynthesis of glutathione (GSH), the most abundant antioxidant in cells. As the glucagon-like peptide-1 (GLP-1) receptor agonists (e.g. exendin-4) effectively reverse hepatic steatosis, the effect of exendin-4 on both homocysteine and redox status was investigated in the livers of rats fed with high-fat diet (HFD). It was found that HFD down-regulated CBS protein expression, whichwas probably due to induction of rno-miR-376c expression in the liver. The level of GSH was markedly reduced, whereas the level of malonydialdehyde, an indicator of lipid peroxidation, was significantly increased in the livers of rats fed with HFD. Exendin-4 treatment increased hepatic CBS protein and GSH levels, and reduced malonydialdehyde level in hyperlipidemic rats. Our findings suggest that GLP-1 receptor agonists have beneficial effects on redox homeostasis in NAFLD. © The Author 2015.

Li Y.,CAS Wuhan Institute of Virology | Li Y.,U.S. Center for Disease Control and Prevention | Li P.,Yanan Hospital | Lei F.,CAS Institute of Zoology | And 10 more authors.
Avian Diseases | Year: 2010

To trace the endemic situation of highly pathogenic influenza H5N1 virus in wildlife in the Lake Qinghai area of northwest China, a continuous surveillance program was implemented from September 2005 to September 2007. A total of 2699 field samples were collected, and 95 of the samples were positive by a reverse transcriptionpolymerase chain reaction (RT-PCR) test of subtype H5 influenza virus. To some extent, the detection rate correlated with the species, the location, and the seasons of collection. In 2007, two H5N1 isolates were identified from two species of migratory birds. The two 2007 isolates showed high similarities of the hemagglutinin and neuraminidase genes with those of the 2005 and 2006 Qinghai isolates (98.699.8 for HA and 98.798.9 for NA at the nucleotide level). Both isolates fell into clade 2.2.2 and were experimentally highly pathogenic to chickens and mice. According to our surveillance results, HPAI H5N1 viruses still exist in this region. © 2010 American Association of Avian Pathologists.

Li H.-M.,Kunming Medical College | Long Y.,Yanan Hospital | Qing C.,Kunming Medical College | Yu M.,Kunming Medical College | And 6 more authors.
Oncology Research | Year: 2011

Burkitt lymphoma (BL) is an aggressive B-cell non-Hodgkin lymphoma (NHL) and it appears to be one of the most common childhood cancers in equatorial areas. Unprecedented gains have been made in the cure rates for BL during the past two decades and these reflect steady improvements in treatment protocols and a multidisciplinary approach to patient care. However, the life-threatening side effects associated with conventional treatment urge us to explore new strategies. Arsenic trioxide (ATO), a natural product that has improved the prognosis of acute promyelocytic leukemia (APL) from highly fatal to highly curable, has also been proven to be effective in treating BL cell lines through multiple pathways in our study. Our data indicates that ATO can inhibit the proliferation of BL cell lines through 1) arresting the cell cycle; 2) decreasing the respiratory function and transmembrane potential of mitochondrial; and 3) downregulating the expressions of Survivin, Bcl-2, MCL-1, and VEGF. We therefore suggest that dissecting the pharmaceutical mechanism of ATO at the molecular and cellular levels may be a good strategy to explore the value of traditional natural products in treating high malignant Burkitt lymphoma. Copyright © 2011 Cognizant Comm. Corp. All rights reserved.

Liu M.-W.,Yanan Hospital | Jiang L.-H.,Yunnan Provincial Hospital for Cardiovascular Disease
Journal of Clinical Rehabilitative Tissue Engineering Research | Year: 2010

OBJECTIVE: To summarize the recent progress and clinical application of percutaneous coronary intervention and to seek the direction of new developments. METHODS: A computerized online database of Pubmed was searched to identify articles published from May 2000 to February 2009 with the key words of "drug eluting stents, percutaneous coronary intervention, and coronary disease". There were 154 articles were retrieved by computer, by reading titles and abstracts, 27 literatures were remained after excluding 74 irrespective papers and 53 repetitive studies. RESULTS: An ideal drug-eluting stent (DES) was comprised of a platform, a drug carrier vehicle and a pharmaceutical compound in harmony with each other. With the ongoing development of DES materials and drugs, more effective DES was introduced in the practice. Recently, clinical data on DES encourage the interventional cardiologist to use DES in more challenging coronary lesions, such as chronic total occlusions, complex lesions and muiti-vessel lesions. However, the safety and efficacy of DES need further attention. Therefore, novel strategies including bioabsorbable stents, and pro-healing agents coated stents were promising. CONCLUSION: The development of percutaneous coronary intervention is a breakthrough in intervention cardiology that brings great benefit to patients with coronary disease, especially for restenosis and revascularization. Nevertheless, more endeavour will be necessary to create PCI with high efficacy as well as low risk, and safety and effectiveness of PCI in patients with ST-segment evaluation myocardial infraction and stent fracture prevention need further study.

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