Zhenhuan Guo

Nanjing Agricultural University, Nan-ching, Jiangsu Sheng, China

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Publications (7)12.56 Total impact

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    ABSTRACT: Two experiments were carried out. In immune response test, the immune enhancement of propolis, oilemulsion and aluminium salt were compared in guinea pig vaccinated with inactivated porcine parvovirus (PPV) vaccine. The result showed that three adjuvants could enhance antibody titer, T lymphocyte proliferation, IL-2 and IL-4 secretion of splenic lymphocyte. The action of propolis was similar to that of oilemulsion and superior to that of aluminium salt, especially in early period of vaccination propolis could accelerate antibody production. In immune protection test, the effects of three adjuvants on PPV infection were compared in guinea pig vaccinated with PPV vaccine then challenged with PPV. The result showed that propolis and oilemulsion could enhance the antibody titer, IL-2 and IL-4 content in serum and decrease the PPV content in blood and viscera. In the effect of improving cellular immune response, the propolis was the best. These results indicated that propolis possessed better immune enhancement and would be exploited into a effective adjuvant of inactivated vaccine.
    Cellular Immunology 04/2011; 270(1):13-8. · 1.74 Impact Factor
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    ABSTRACT: Four prescriptions, epimedium flavone plus propolis flavone (EF-PF), epimedium flavone plus propolis extracts (EF-PE), epimedium polysaccharide plus propolis flavone (EP-PF) and epimedium polysaccharide plus propolis extracts (EP-PE), were prepared and their immune-enhancing effects were compared. In test in vitro, the effects of them on chicken peripheral lymphocyte proliferation were determined by MTT method. The results showed that EP-PF group presented the highest stimulating index at most concentrations. In immune test, 300 14-day-old chickens were randomly divided into six groups and vaccinated with ND vaccine except for blank control (BC) group, re-challenged at 28 days of age. At the same time of the first vaccination, the chickens in four experimental groups were injected, respectively, with four prescriptions. The changes of the lymphocyte proliferation and antibody titer were determined. On day 28 after the first vaccination, the chickens except for BC group were challenged with NDV, the immune protective effect was observed. The results displayed that in EP-PF group, the antibody titers, lymphocyte proliferation and protective rate were the highest, the morbidity and mortality were the lowest. In dose test, 14-day-old chickens were randomly divided into five groups. The treatment and determinations were the same as the immune test except that the chickens in experimental groups were injected, respectively, with high, medium and low doses of EP-PF. The results revealed that in medium dose group, the antibody titers, lymphocyte proliferation and protective rate were the highest, the morbidity and mortality were the lowest. These results indicated that EP and PF possessed synergistically immune enhancement, EP-PF had the best efficacy, especially at medium dose, and would be expected to exploit into a new-type immunopotentiator.
    International journal of biological macromolecules 08/2010; 47(2):87-92. · 2.37 Impact Factor
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    ABSTRACT: Three hundred and sixty 14-day-old chickens were divided into seven groups. The chickens, except for blank control group, were vaccinated with Newcastle disease vaccine, repeated at 28 days old. At the same time of the first vaccination, the chickens in three astragalus polysaccharide-oxymatrine (AP-OM) groups were orally administrated respectively with the mixture of AP-OM at high, medium and low concentrations, in astragalus polysaccharide (AP) group and oxymatrine (OM) group, with corresponding medicine, in non-medicine (NM) control group, with equal volume of physiological saline, once a day for 3 successive days. On 14, 21, 28, 35 and 42 days after the first vaccination, the changes of peripheral lymphocyte proliferation and serum antibody titers of the chickens were determined by MTT method and hemagglutination inhibition test. On 14, 28 and 42 days after the first vaccination, the serum IL-2 concentration was determined by Enzyme-linked Immunosorbent Assay (ELISA). The results showed that at most time points, the lymphocyte proliferation, antibody titers and IL-2 concentrations of 5 medicine-administrating groups were significantly higher than that of corresponding NM group. At some time points, the lymphocyte proliferation, antibody titers and IL-2 concentrations in high and medium doses of AP-OM groups were significantly or numberly higher than those in AP group and OM group. It indicated that AP-OM could significantly improve the immune efficacy of Newcastle disease vaccine, astragalus polysaccharide and oxymatrine possessed synergistical immunoenhancement.
    International journal of biological macromolecules 02/2010; 46(4):425-8. · 2.37 Impact Factor
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    ABSTRACT: In order to investigate the possibility of sulfating modification in improving the anti-viral activity of lentinan (LNT), three kinds of sulfated LNTs (sLNT), sLNT1, sLNT2 and sLNT3 with the degree of substitution of 0.69, 0.98 and 1.37 were prepared by chlorosulfonic acid–pyridine method with three modification condition, respectively. The sLNTs and avain infectious bronchitis virus (IBV) were added into chicken embryo fibroblast (CEF) in three manners, pre-adding polysaccharide, post-adding polysaccharide and mixed adding polysaccharide with IBV, respectively, taking non-modified LNT as control. The anti-viral activities of three sLNTs were compared by MTT method. The results showed that all of sLNTs and LNT at a certain concentration could significantly inhibit IBV growth in three manners. The effects of modified sLNTs were better than that of non-modified LNT. It indicated that sulfated modification could enhance the anti-viral activity of LNT.
    Carbohydrate Polymers - CARBOHYD POLYM. 01/2010; 79(2):461-465.
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    ABSTRACT: In order to select the sulfated polysaccharide prescription (sPSP) with the best immunoenhancement, 270 14-day-old chickens were averagely divided into nine groups and vaccinated with ND-IV vaccine. The chickens in seven experimental groups were intramuscularly injected with three sulfated polysaccharides and their four prescriptions (sPSPs). The serum antibody and peripheral lymphocyte proliferation were measured. On day 23 after vaccination, all chickens except for Negative control group were challenged with Newcastle disease virus. The morbidity, mortality and immune protective rate were calculated and their serum antibody titers were determined. The results showed that all sulfated polysaccharides and their prescriptions could obviously or significantly enhance the immune response of ND vaccine in vaccinated chicken and increase the immune protective rate in challenged chicken. sPSP1 possessed the best efficacy, stronger than its components as well, and would be expected as a candidate of new-type immune adjuvant.
    Carbohydrate Polymers. 01/2010;
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    ABSTRACT: The purpose of this research is to study the effect of sulfated lentinan (sLNT) on immune effect of Newcastle disease (ND) vaccine. In immune response test, 14-day-old chickens were vaccinated with ND vaccine then grouped respectively to inject three sLNTs at two doses, once a day for three successive days, taking non-sulfated lentinan (LNT) as the control. The changes of serum antibody titer and peripheral lymphocyte proliferation were determined before and after vaccination. In immune protection test, 35-day-old chickens were challenged with ND virus (NDV) after treated similar to above mentioned. The morbidity and mortality of chickens were observed, and the changes of serum antibody titer and peripheral lymphocyte proliferation were measured before and after challenge. The results showed that three modified sLNTs could significantly enhance serum antibody titer and promote lymphocyte proliferation in two experimental chickens, and reduce morbidity and mortality of chickens challenged with NDV, which were better than that of non-modified LNT. Their high doses in enhancing antibody titer and low doses in promoting lymphocyte proliferation were more preferable. These results indicated that sulfated modification could enhance the adjuvanticity of LNT and improve the immune effect of ND vaccine. sLNT(2) possessed the best efficacy and would be expected as the candidate of a new-type immune adjuvant.
    Vaccine 01/2009; 27(5):660-5. · 3.49 Impact Factor
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    ABSTRACT: Four kinds of astragalus polysaccharides (APSs), APS(t), APS(40), APS(50) and APS(60), were extracted by water decoction and one-step or stepwise ethanol precipitation methods, and modified by chlorosulfonic acid-pyridine method to obtain four sulfated APSs (sAPSs) (sAPS(t), sAPS(40), sAPS(50), sAPS(60)), respectively. The effects of four sAPSs on cellular infectivity of bursal disease virus (IBDV) were compared by MTT method taking non-modified APS(t) as control. The results showed that modified sAPSs inhibited IBDV to infect CEF significantly in comparison with non-modified APS(t), which indicated that sulfated modification could enhance the antiviral activity of the APS, by which it would be expected to develop a new-type antiviral drug.
    International Journal of Biological Macromolecules 04/2008; 42(2):166-71. · 2.60 Impact Factor