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日粮维生素D_3水平对黄鳝免疫调控及免疫功能影响的研究
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摘要
本试验通过在日粮中添加不同水平的VD3,研究其对黄鳝免疫相关基因的表达、外周免疫器官的细胞、组织形态学变化、免疫功能和生产性能等方面的影响,以期探讨VD3对黄鳝免疫功能和免疫调控机制的影响,并初步筛选出提高黄鳝免疫应答的日粮VD3适宜添加水平,逐步积累、充实和拓展黄鳝免疫营养学研究资料,为黄鳝健康养殖提供依据。
     试验采用单因子试验设计,挑选体质健康、平均体重21.7土2.1g的黄鳝1080尾,随机分为6组,每组3个重复,每个重复60尾。对照组饲喂基础日粮(其中VD3为0IU/kg VD3),其余5个试验组在基础日粮中分别添加250、500、1000、2000和4000IU/kg的VD3。于投喂试验日粮后第20d、40d和60d,从各组随机选择6尾黄鳝,分别采集其肝胰脏、脾脏、头肾和后肠组织,采用RT-PCR技术检测内脏组织MHC-Ⅱ-B、 Hepcidin基因表达的影响;采用组织学方法观察饲喂日粮后第60d4种组织形态变化,采用流式细胞术检测4种组织细胞周期和细胞凋亡的变化;各饲喂周期,分别采集血样检测血液常规指标和免疫功能指标;并研究VD3对黄鳝生长和肠道消化酶活力的影响以及活菌攻毒后对黄鳝的保护作用。结果表明:
     (1)MHC-Ⅱ-B基因在4种组织的表达丰度依次为头肾、脾脏、后肠和肝胰脏,各组织间表达差异显著(P<0.05);喂试验日粮后20d,VD3水平为4000IU/kg时显著增强头肾MHC-Ⅱ-B基因表达量,2000IU/kg则显著提高脾脏表达量(P<0.05);投喂试验日粮后40d,VD3水平为1000IU/Kg时能显著增强除脾脏外其它3种组织基因表达量;饲喂期达60d时,较低水平(500IU/Kg)的VD3即能显著促使头肾和脾脏内MHC-Ⅱ B基因表达(P<0.05),高剂量(4000IU/Kg)VD3则抑制其表达。
     (2)hepcidin基因在4种组织的表达丰度依次为肝胰脏、脾脏、头肾、后肠,各组织间表达差异显著(P<0.05);随VD3添加剂量增加,黄鳝抗菌肽hepcidin基因在4种组织的表达量同一时间点均呈现出先升高后降低的趋势;20d时,2000IU/Kg添加组4种组织的表达量均达到最高(P<0.05);40和60d时,500IU/Kg处理组肝胰脏、头肾表达量达最高(P<0.05);60d时,4000IU/Kg处理组的表达量反而明显下降(P<0.05)。
     (3)日粮VD3水平能明显影响黄鳝外周淋巴器官(组织)的组织学变化。低水平VD3日粮组:黄鳝脾脏视野中脾小体数目极少;头肾中仅见零星淋巴细胞稀疏分布于其造血组织间;肝胰脏组织结构完整,肝细胞排列紧密,肝细胞索明显;肠黏膜绒毛低矮,杯状细胞极少。中等水平VD3添加组:脾脏视野中白髓比列增大,较多脾小体清晰可见;头肾淋巴细胞、粒细胞增生,淋巴组织分布区域扩大。高水平VD3添加组:脾脏脾小体数目明显减少,并逐渐退化消失;可见大量淋巴细胞、粒细胞增殖,造血组织分布区域明显减小;肝脏局部细胞破裂溶解。
     (4)日粮VD3水平可显著影响黄鳝外周淋巴器官(组织)细胞周期和细胞凋亡。VD3对脾脏、后肠和头肾3种组织细胞周期和凋亡的影响变化趋势基本一致,适宜VD3水平(1000IU/kg)促进细胞增殖,减少细胞凋亡,有利于3种组织生长和发育;VD3缺乏和VD3过高,都会使细胞增殖受阻,凋亡发生率高。VD3对肝胰脏细胞增殖起抑制作用,添加水平越高抑制作用越强,同时高水平VD3诱导细胞凋亡
     (5)适宜VD3添加水平促进黄鳝RBC生成和HGB的合成,以及HCT、MCHC升高,PLT数目增多;并能显著提高黄鳝SOD、GSH-Px、CAT、AKP、ACP酶活力和血清总Pr含量。
     (6)日粮适宜的VD3水平(500-2000IU/Kg)可提高黄鳝IgM表达水平,CD4/CD8比值、血清溶菌酶含量,白细胞、粒细胞和单核细胞总数,增强黄鳝体液免疫、细胞免疫和非特异性免疫功能。
     (7)日粮适宜VD3添加水平能提高嗜水气单胞菌攻毒后的黄鳝存活率,减轻各组织器官病变程度,对黄鳝具有一定的保护作用。
     (8)VD3添加水平为500IU/Kg时,黄鳝增重率、特定生长率、存活率、饲料转化率、饲料系数等指标均明显优于其它各组(P<0.05); VD3水平为4000IU/Kg时,其生长相关指标与对照组无显著差异(P>0.05);VD3添加水平在一定范围内能明显提高黄鳝前肠和肝胰脏的消化酶活力。
     本研究结果表明,日粮适宜维生素D3水平可通过促进黄鳝肝胰脏、脾脏、头肾、后肠(?)(?)HC-Ⅱ-B基因和抗菌肽hepcidin基因表达,影响外周淋巴器官组织学变化和降低细胞凋亡率,提高机体抗氧化能力和消化酶活力,增强黄鳝免疫功能及改善其生产性能。
This experiment through the dietary Vitamin D3(VD3), study on immune related gene expression of peripheral immune organs, cells, tissue morphological changes, immune function and production performance and other aspects of the impact, with a view to explore the VD3on immune function and immune regulation effects, and initially screened to improve the immune response to dietary VD3suitable addition level, gradually accumulated, enriching and developing the Monopterus albus immune nutrition research data, provide the basis for healthy breeding of M.albus.
     Test methods of single factor experimental design, selection of physical health, average weight of21.7±2.1g M.albus1080populations, were randomly divided into6groups, each group of3repetitions, each repeated60populations.The control group was fed with basic diet (where VD3is0IU/kg VD3), the remaining5test groups in a basal diet were added250,500,1000,2000and4000IU/kg VD3.In a feeding trial of dietary after the20d,40d and60d, from each group was randomly selected6populations M.albus, separately collecting the liver and pancreas, head kidney, spleen, last of the intestinal tract, using RT-PCR technology to detect visceral tissue MHC-II-B, Hepcidin gene expression; using histology observation after the first feeding diets the60d4organization changes in morphology, flow cytometry was used to detect4kinds of tissue apoptosis and cell cycle changes; the feeding cycle, respectively, to collect the blood detection routine blood index and immune function index; feeding trial ended, studied the VD3on growth and digestive enzyme activity and the influence of live bacteria attack after protective effects of M. albus.
     The results showed that:(1) MHC-II-B gene in4kinds of tissue expression abundance in head kidney, spleen, last of the intestinal tract, liver and pancreas, among the various organizations expressed significant difference (P<0.05); feed the test diet after20D, VD3level was4000IU/kg significantly enhance the head kidney MHC-II-B gene expression amount,2000IU/kg were significantly increased spleen expression (P<0.05); feeding test diets after40d, VD3level was1000IU/Kg at40d could significantly enhance except the spleen and other3kinds of tissue gene expression amount; feeding period up to60d, low level (500IU/Kg) of VD3could significantly promote head kidney and spleen of MHC-II-B gene expression (P<0.05), high dose (4000IU/Kg) VD3the expression amount to a minimum. Results suggest that, in head kidney MHC-II-B gene expression as the main reference, short-term high feeding level (VD32000IU/Kg) diets can improve immune response of M.albus; short-term feeding at1000IU/Kg or500IU/Kg level is appropriate.
     (2) hepcidin gene in4kinds of tissue expression abundance in liver and pancreas, spleen, head kidney, last of the intestinal tract, among the various organizations expressed significant difference (P<0.05); with VD3dosage increase, M. albus cecropin hepcidin gene in4kinds of tissue expression quantity at the same time showed increased first and then lowering trend;20D,2000IU/Kg add group4organization were in the highest (P<0.05);40and60d,500IU/Kg group of liver and pancreas, head kidney in reached peak (P<0.05);60d,4000IU/Kg processing group VD3will make hepcidin gene expression was significantly decreased (P<0.05).Results indicated that, within a short time of dietary high dose (2000IU/Kg) of VD3can significantly improve the M. albus in visceral tissues of hepcidin gene expression amount; feeding cycle longer, diets supplemented with500IU/Kg VD3significantly increased hepcidin gene expression in M. albus liver and pancreas,head kidney.
     (3) Low levels of VD3diet group in the view of M. albus spleen splenic corpuscle minimal number; head kidney only sporadic lymphocyte sparsely distributed in the hematopoietic tissue in liver and pancreas; structure integrity, liver cells were arranged closely, liver cell cord evident; intestinal mucosal villous height low, goblet cells with minimal. Intermediate level VD3add group, spleen white pulp ratio of column in the view of increased splenic corpuscle, more clearly visible; head kidney lymphocytes, polymorphonuclear cells proliferation, distribution of lymphoid tissue expansion. High levels of VD3to add group, splenic corpuscle number was decreased, and gradually degraded disappear; visible large lymphocytes, granulocytes and proliferation of hematopoietic tissue distribution area, reduced obviously; local hepatic cell rupture dissolved. Results:the dietary VD3levels can affect the peripheral lymphoid organs (tissues) and histological changes, which may influence the immune function of M. albus.
     (4) Dietary VD3levels can significantly affect the M. albus peripheral lymphoid organs (tissues) on cell cycle and apoptosis.VD3on the spleen, hindgut and head kidney3organization of cell cycle and apoptosis tendency, proper VD3level (1000IU/kg) promotes cell proliferation, reduced apoptosis, in favor of3kinds of tissue growth and development; VD3deficiency and VD3is too high, will exhibit cell proliferation is blocked, apoptosis rate high.VD3on liver and pancreatic cell proliferation inhibition, add level the higher the stronger the inhibitory effect, and high levels of VD3inducing apoptosis. Results: the proper VD3level (1000IU/kg) can promote M. albus peripheral lymphoid organs (tissues) cell proliferation, apoptosis rate decreased, conducive to the peripheral lymphoid organs growth; high levels of VD3can induce cell proliferation is blocked, apoptosis is accelerated, causing the body to suppress immune functions.
     (5) Suitable for VD3adding level M. albus promote RBC production and HGB synthesis, and HCT, the elevation of MCHC, PLT number; can significantly improve SOD, GSH-Px, CAT, the AKP, ACP enzyme activity and serum total Pr content. Results:the dietary appropriate VD3levels (500-1000IU/Kg), can significantly improve the nutritional status and the enhancement of M. albus antioxidant ability.
     (6)The optimal dietary VD3levels (500-2000IU/Kg) can improve M.albus the expression level of IgM, CD4/CD8ratio, serum lysozyme levels, leukocyte, granulocyte and monocyte count, enhances the M.albus humoral immunity, cell immunity and non-specific immune function, increased disease defense capability.
     (7) The optimum dietary VD3supplementation levels can improve the M.albus survival rate after the Aeromonas hydrophila attack, reduce the severity of various tissues and organs, M.albus has a protective effect.
     (8) When VD3concentration was500IU/Kg, the rate of weight gain, specific growth rate, survival rate, feed conversion rate, feed coefficient and other indicators are significantly better than the other groups (P<0.05), VD3levels of0and4000IU/Kg, M.albus, survival rate, growth rate feed conversion rate, utilization rate of protein and other indicators have no significant difference (P<0.05); VD3add level within a certain range can significantly improve the foregut and hepatopancreas of the digestive enzyme activity. Results:the suitability of VD3add level could improve the growth performance of M.albus.
引文
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