鎘對河南華溪蟹血淋巴細胞的毒性效應(yīng)及脂多糖的調(diào)節(jié)作用
[Abstract]:In this doctoral dissertation, the toxic effects of subchronic cadmium exposure on blood lymphocytes and the regulation of lipopolysaccharide were studied with the blood lymphocyte (hemocytes) of Sinopotamon henanense in Henan. The experiment set up 3 cadmium treatment groups (0.725,1.450 and 2.900 mg/L) and a blank control group, respectively, to deal with 7 D, 14 d and 21 D. were divided into two groups, one of which was used to study the toxicity of cadmium. The other group was injected with 10 g/mL concentration of lipopolysaccharide to study the regulation of lipopolysaccharide on cadmium toxicity. First, the blood lymphocytes were observed by transmission electron microscopy (transmission electron microscope, TEM). Morphological changes and membrane integrity were used to investigate the damage of cadmium to the ultrastructure of blood lymphocytes from the morphological angle. Secondly, the total number of blood lymphocytes (total hemocyte counts, THC) was measured by the blood cell count board, and the concentration of cadmium in blood lymphocytes was detected by flame atomic absorptiometer, and the reactive oxygen free radicals were measured by colorimetric method. The activity of lysosomal enzymes (reactive oxygen species, ROS), acid phosphatase (acid phosphatase, ACP), alkaline phosphatase (alkaline phosphatase, AKP), and lysozyme (lysozyme, LSZ)). The stability of the lysosomal membrane was determined by neutral red staining. The system was further mediated by the enrichment of cadmium. Changes in the physiological and biochemical functions of blood lymphocytes and the regulation of lipopolysaccharide on this change. On this basis, in order to study the activity of antioxidant enzymes and the degree of oxidative damage, the total antioxidant capacity (total antioxidant capacity, T-AOC), antioxidant enzyme: superoxide dismutase (superoxide dismuta) were measured by the purchased biochemical kit. Se, SOD), the changes in the activity of catalase (catalase, CAT), glutathione peroxidase (glutathione peroxidase, GPx) and peroxidase (peroxidase, POD), and the content of malondialdehyde (malondialdehyde, MDA) in the product of lipid peroxidation. Vates, PCO) content, the DNA- protein crosslinking rate (DNA-protein crosslink, DPC) was detected by KCL-SDS precipitation method. Finally, three kinds of genes were expressed by the real-time fluorescent quantitative PCR method for the immunologic related genes of phenoloxidase (prophenoloxidase, proPO), and the lysozyme (lysozyme, LSZ) and metallothionein. The activity of PO was measured by colorimetric method. The response mechanism of cadmium stress and the regulation of lipopolysaccharide were studied at the molecular level, and the toxic and toxic mechanisms of cadmium on the immune system of Henan crabs were expounded. The results included the following four aspects: 1. the influence of cadmium on the ultrastructure of the blood lymphocyte of Creek crabs According to the overall morphology of the cell, the number and size of the particles in the cytoplasm can be divided into three types: large granulosa cells, small granular cells and no granulosa cells in Henan. Large granular cells have larger size, smaller nuclei, more electron density particles in the cytoplasm, and many kinds of organelles; small granular cell bodies. The volume of the cytoplasm is small and the cytoplasm contains a small amount of particles; the volume of the granulosa cells is generally small and almost no particles. The cytoplasm is less observed. Cadmium exposure can cause degranulation, nuclear deformation, chromatin concentration, mitochondrial crista fracture, vacuolization to the disappearance, the dilation of the rough endoplasmic reticulum, and ribose on the cytoplasm. It was also found that the cadmium exposure time of the high concentration group (2.900 mg/L) was prolonged from 7 d to 21 d, and the damage degree of the ultrastructure of the blood lymphocyte was more than that of the low concentration group (0.725 mg/L), the effect of.2. treatment on the blood lymphatic cell immunity related factors of Henan Chinese crabs and the regulation of lipopolysaccharide The concentration of cadmium in the blood lymphocytes of crabs of South China brook increased with the increase of exposure concentration and exposure time, which showed an upward trend and had a dose effect. Cadmium led to a significant decrease in the total number of blood lymphocytes in crabs, the ROS level increased significantly, and the stability of the lysosome membrane decreased. In addition to LSZ, cadmium exposure caused ACP and AKP activities in blood lymphocytes. Compared with cadmium alone, lipopolysaccharide caused the decrease of the total number of blood lymphocytes in crabs, ROS decreased to a certain extent, the stability of the lysosome membrane decreased, the activity of ACP and AKP increased, and the activity of LSZ had no significant changes in.3. stress on the antioxidant enzymes and oxidative damage of the blood lymphocytes of Henan Chinese crabs. The effects of injury and the regulation of lipopolysaccharide on the activity of antioxidant enzymes SOD, CAT, GPx and POD in the blood lymphocytes of Henan Chinese crabs with the increase of cadmium concentration and the prolongation of treatment time, the trend of "first increase and then decrease" was presented as a whole, that is, low concentration of cadmium (0.725 mg/L) significantly induced the increase of antioxidant enzyme activity and high concentration of cadmium (2.900 mg/). L) inhibited the activity of the enzyme. After lipopolysaccharide, the activity of the four enzymes was lower than the activity of the corresponding cadmium treatment group. The oxidative damage indexes in the blood lymphocytes, such as PCO, DPC and MDA, were all increasing gradually. Compared with the cadmium alone, the cadmium was reinjected into lipopolysaccharide after exposure to cadmium, and the three oxidative damage indexes appeared in different processes. When the exposure time of cadmium was prolonged to 21 d, there was no significant decrease in the oxidative damage index, and the lipopolysaccharide alleviated the oxidative damage effect caused by cadmium to a certain extent,.4. Henan Chinese crab blood lymphocytes to the immune response to cadmium and the regulation of lipopolysaccharide with the increase of cadmium concentration or prolongation of exposure time, Henan Hua Hua. The expression of proPO mRNA in the blood lymphocytes of crabs showed a downward trend on the whole. Compared with the effect of cadmium alone, the expression of proPO mRNA increased after the action of lipopolysaccharide, and the.PO activity showed a "first rise and then descend" trend during the whole process. After cadmium exposure, the activity of PO was compared with that of the isolated treatment group. The level of LSZ mRNA expression in the blood lymphocytes of crabs induced by cadmium increased and showed a dose effect. After exposure to cadmium exposure to lipopolysaccharide, the expression level of LSZ mRNA decreased in different degrees. In addition, with the prolongation of exposure time or the increase of cadmium concentration, MT mRNA The expression level of MT mRNA was decreased when cadmium exposed to lipopolysaccharide after exposure to cadmium. The results showed that 1. cadmium stress changed the ultrastructure of the blood lymphocytes of Henan Chinese crabs, which caused by high concentration of cadmium exposure to blood lymphocytes. The damage is more serious, indicating that the blood lymphocyte is the target organ of the toxic effect of cadmium, the damage of these structures may affect the normal synthesis and secretion of immune related factors, which leads to the loss of normal immune function of the crabs,.2. increases the level of ROS because of the enrichment of cadmium in the blood lymphocytes of Henan crabs, and the ROS is further to the lysase. The body causes damage and release lysosomal enzyme, while lipopolysaccharide can reduce the ROS level and enhance the immune ability of the crab body to a certain extent,.3. cadmium can induce lipid, protein and DNA oxidative damage by changing the antioxidant enzyme activity of the blood lymphocytes of Henan crabs, and the immune function of blood lymphocytes can be reduced at the end of the year. The effects of.4. cadmium on the immune related genes in the blood lymphocytes of Henan Chinese crabs were obviously affected by the regulation of antioxidant enzyme activity. Cadmium inhibited the expression of proPO mRNA, but could induce the expression of LSZ and MT two genes mRNA, and the regulation of lipopolysaccharide on the expression of the three genes was different.
【學(xué)位授予單位】:山西大學(xué)
【學(xué)位級別】:博士
【學(xué)位授予年份】:2017
【分類號】:R114
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