Acta Veterinaria et Zootechnica Sinica ›› 2021, Vol. 52 ›› Issue (12): 3578-3587.doi: 10.11843/j.issn.0366-6964.2021.012.024

• PREVENTIVE VETERINARY MEDICINE • Previous Articles     Next Articles

Improvement of the Immune Protection Rate on Newcastle Disease Virus Attenuated Vaccine LaSota Strain by Pig Spleen Transfer Factor

XU Lei1, ZHONG Jialian1, YU Xunxin1, LIU Yifa1, HUANG Yu2,3*, LIU Xiaolong4, LAI Longyong4, YAN Liping5, XU Xiumei6, SONG Suquan5*, ZHANG Yuankui6*   

  1. 1. Fujian Agricultural Vocational Technical College, Fuzhou 350119, China;
    2. Fujian Provincial Key Laboratory for Avian Diseases Control and Prevention, Fuzhou 350013, China;
    3. Institute of Animal Husbandry and Veterinary Medicine, Fujian Academy of Agricultural Sciences, Fuzhou 350013, China;
    4. Present (Fuzhou) Biotech Company Limited, Fuzhou 350500, China;
    5. College of Veterinary Medicine, Nanjing Agricultural University, Nanjing 210095, China;
    6. Zhaofenghua Biotechnology (Nanjing) Co., Ltd., Nanjing 211102, China
  • Received:2021-03-22 Online:2021-12-25 Published:2021-12-22

Abstract: This study was conducted to evaluate the immune enhancement effect and mechanism of pig spleen transfer factor(TF) on Newcastle disease virus(NDV) attenuated vaccine LaSota strain. Specific pathogen free(SPF) chickens were inoculated with different doses(10-2, 10-3,10-4, 10-5) of NDV strain LaSota(vaccination group without TF), NDV strain LaSota combined with TF(vaccination group with TF), respectively, and challenged with virulent NDV strain F48E9 on 14 days post vaccination(dpv). The control group(non-immunized but challenged) and blank group(non-immunized and non-challenged) were set up simultaneously. In addition, the change of IL-4, IFN-γ and IL-12 P40 in peripheral blood were analyzed by ELISA and protein chip technology. The protection rate of different doses and median protective dose(PD50) were 100%, 55%, 0%, 0%, 0.000 8 doses in the plume in vaccination group without TF, respectively, and 100%, 75%, 0%, 0%, 0.000 5 doses in the plume in vaccination group with TF. In contrast, the mortality of control group and blank group were 100% and 0%. After immunization with 10-3 dose of vaccine, the levels of IL-4 and IFN-γ in vaccination group with TF were higher than in other groups and the difference was extremely significant on 7 and 14 dpv(P<0.01). After challenge, the levels of IL-4, IFN-γ and IL-12 P40 in vaccination group with TF were higher than in other groups. The differences of IL-4 on 1 and 14 days post challenge (dpc), IFN-γ on 1 and 3 dpc, IL-12 P40 on 1 dpc were extremely significant(P<0.01). These findings indicated that TF could reinforce cellular immunity by IFN-γ, IL-12 and humoral immunity by IL-4, improve the immune protection rate of NDV attenuated vaccine LaSota strain and reduce the PD50. Vaccination group with TF was more effective than vaccination group without TF against virulent NDV strain F48E9.

Key words: pig spleen transfer factor, attenuated chicken NDV strain LaSota, virulent chicken NDV strain F48E9, immune protection rate, cytokine

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