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1.
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2.
The aim of the present study was to investigate influences of threonine and tryptophan supplementation (TTS) on immune response of growing pigs inoculated with modified live porcine reproductive and respiratory syndrome virus (PRRSV) vaccine. Twenty growing barrows (Landrace × Yorkshire) were randomly assigned to four groups according to the PRRS vaccination and TTS. Serum samples were collected from all pigs at days 0, 7, 14, 21, 28, 35, 49 post‐vaccination (day 0 defined as the day of vaccination). Pigs were euthanized and samples collected at day 49 post‐vaccination. The results showed that TTS tended to increase weight gain and average daily gain (ADG) of pigs (P < 0.1). PRRS vaccine enhanced serum PRRSV‐specific antibody, serum virus neutralizing (SVN) antibody and interferon‐γ, interleukin (IL)‐10 and IL‐1β concentrations (P < 0.05). The expression of TLR3 and TLR7 mRNA in lymph nodes were higher in TTS than in the control group after PRRS vaccine inoculation (P < 0.05). TTS diet mitigated lung damage which is induced by PRRS vaccination from microscopic evaluation. These results suggest that dietary TTS could improve growth performance of growing pigs, which may be ascribed to the improved immune response and mitigated lung damage.  相似文献   

3.
In the present study, the effect of dietary procyanidin (PCA, from pine needles) supplementation on the innate immunity of broilers were investigated. The experiment was designed as a 2 × 4 factorial arrangement (eight cages / treatment; six birds (one‐day‐old) / cage) with dietary PCA concentrations (0, 0.05, 0.075 and 0.1%) and two immune treatments (injection of lipopolysaccharide (LPS) (0.5 mg/kg body weight) or saline). LPS was dissolved in sterile 9 g/L (w/v) NaCl solution at 16, 18, 20 days of age to mimic immune stress. The remaining birds were injected with saline as a placebo. The results indicated that, prior to LPS challenge, the PCA diet had no significant effect on bird growth performance. The injection of LPS was also not associated with any significant changes in poultry performance. LPS injection increased the activity of nitrogen oxides (NOx) and the concentrations of inflammatory cytokines (interferon‐γ (IFN‐γ), interleukin‐1β (IL‐1β), IL‐2, IL‐4, IL‐6 and IL‐10) in serum; dietary PCA decreased these concentrations (P < 0.05) in the PCA 0.1% group, further illustrating the immune effect of PCA. In conclusion, PCA supplementation has a beneficial effect on LPS challenge, which may be associated with the inhibition of the secretion of cytokines and decrease in the proinflammatory marker NOx.  相似文献   

4.
This study was conducted to investigate the effects of Bacillus subtilis B10 spores on the viability and biological functions of murine macrophage. RAW 264.7 cells were stimulated both with and without B. subtilis B10 spores for 12 h. Then cell viability was determined to evaluate the cytotoxic effect of B. subtilis B10 spores to the cells, and the activities of acid phosphatase (ACP) and lactate dehydrogenase (LDH), the production of nitric oxide (NO) and inducible nitric oxide synthase (iNOS), and the secretion of inflammatory cytokines were measured to analyze the functions of macrophages. The results showed that B. subtilis B10 spores were not harmful to RAW 264.7 cells and they also strongly enhanced the activities of ACP and LDH (P < 0.01), remarkably increased NO and iNOS production (P < 0.01), and significantly stimulated the secretion of pro‐inflammatory cytokines, including tumor necrosis factor‐alpha (TNF‐α), interferon‐gamma (IFN‐γ), interleukin‐1 beta (IL‐1β), IL‐6, IL‐8 and IL‐12 (P < 0.01) while they reduced anti‐inflammatory cytokine IL‐10 (P < 0.01). The outcomes suggest that B. subtilis B10 spores are not only safe for murine macrophages, but also can activate these cells and enhance their immune function. The above findings suggest that B. subtilis B10 spores are potentially probiotic.  相似文献   

5.
β‐carotene is one of the most abundant carotenoids, has potential anti‐inflammatory effect, it has been reported that β‐carotene could suppress LPS‐induced inflammatory responses by inhibiting nuclear factor kappa B (NF‐κB) translocation, but the more detailed molecular mechanisms underlying the anti‐inflammatory action of β‐carotene remain to be fully understood. In this study, we investigated the influence of β‐carotene on the activation of JAK2/STAT3, MAPK, and NF‐κB signaling pathway induced by LPS in RAW264.7 cells and peritoneal macrophages. Cells were treated with different concentrations of β‐carotene for 3 hr after LPS treatment for 24 hr. The mRNA expression and the release of IL‐1β, IL‐6, and TNF‐α were evaluated by RT‐PCR and ELISA, and the level of signaling proteins of JAK2/STAT3, MAPK, and NF‐κB signaling pathway were detected by Western blot. The results showed that β‐carotene significantly suppressed (p < 0.05) LPS‐induced release of IL‐1β, IL‐6, and TNF‐α and their mRNA expression. LPS‐induced JAK2/STAT3, IκB/NF‐κB p65, JNK/p38 MAPK signal activation were significantly attenuated (p < 0.05) by β‐carotene in a dose‐dependent manner. In conclusion, β‐carotene could attenuate LPS‐induced inflammation via inhibition of the NF‐κB, JAK2/STAT3, and JNK/p38 MAPK signaling pathways in macrophages.  相似文献   

6.
This study evaluated the effects of berberine on growth performance, immunity, haematological parameters, antioxidant capacity, and the expression of immune response‐related genes in lipopolysaccharide (LPS)‐challenged broilers. We assigned 120 one‐day‐old male broilers (Ross 308) to two treatment groups; each group included two subgroups, each of which included six replicates of five birds per replicate. The experiment used a 2 × 2 factorial arrangement with berberine treatment (0 or 60 mg/kg dietary) and challenge status [injection of saline (9 g/L w/v) or LPS (1.5 mg/kg body weight)] as the main factors. On days 14, 16, 18 and 20, broilers were intraperitoneally injected with LPS or physiological saline. Blood and liver samples were collected on day 21. Dietary berberine supplementation significantly alleviated the compromised average daily gain and average daily feed intake (p < 0.05) caused by LPS. The LPS challenge led to increased lymphocyte and white blood cell (WBC) counts, malondialdehyde (serum and liver) content, and immunoglobulin G and M, tumour necrosis factor‐α (TNF‐α) and interleukin‐1β (IL‐1β) expression (p < 0.05) and significantly reduced serum total superoxide dismutase (T‐SOD) activity (p < 0.05). Dietary berberine significantly mitigated the LPS‐induced decreases in the mRNA expression of nuclear factor‐kappa B (NF‐κB), TNF‐α, IL‐1β, inducible nitrite synthase and cyclooxygenase‐2 (p < 0.05) in the liver. In conclusion, berberine supplementation has a positive effect on LPS challenge, which may be related to the increase in antioxidant enzyme activity and inhibition of both NF‐κB signalling and the expression of inflammatory mediators.  相似文献   

7.
The objective of this study was to evaluate the long‐term survival rates, clinical response, and lung gross and microscopic changes in pigs treated intratracheally with lipopolysaccharide of Escherichia coli 0111:B4 (LPS‐Ec). Healthy pigs were randomly allocated to three groups: (i) no‐LPS‐Ec (n = 1), (ii) LPS‐Ec‐T1 (1 mg/mL, 10 mL/pig) (n = 7), and (iii) LPS‐Ec‐T2 (0.5 mg/mL, 10 mL/pig) (n = 6). Two pigs from each dose group were euthanized at 24 (n = 3 for T1), 48 and 144 h post‐LPS‐Ec challenge. LPS‐Ec‐treated animals showed macroscopic lesions in middle lobes of the lung. A reversible recruitment of macrophages and neutrophils was observed at 24, 48, and 144 h post‐LPS‐Ec challenge. The highest cellular infiltration level was observed at 24 h after challenge. The highest clinical scores were evident in both experimental dose levels within 3 and 5 h after LPS‐Ec administration. Administration of LPS‐Ec, under the conditions evaluated, can be used to induce a reproducible model of acute pulmonary inflammation in pigs.  相似文献   

8.
Summary

In the present study four attenuated virus strains, used as vaccines, and a virulent strain of Aujeszky's disease virus (AD V) were compared with respect to their virulence in mice, their ability to induce virus‐specified thymidine kinase (TK) in infected cells, and their cleavage profiles of viral DNA's after treatment with the restriction endonuclease Kpnl.

The survival time of mice inoculated with the B‐KAL or the virulent NIA‐3 strain was comparable. whereas the Hanha and BUK strains required significantly loniser periods to kill mice. Mice were resistant to the MK‐25 strain of ADV.

The strains were assayed for TK phenotype by plaque autoradiography after 3H‐thymidine labelling of infected cells. MK‐25 proved to be the only strain defective in induction of TK in pig kidney cells. Restriction endonuclease analysis of viral DNA's revealed that each vaccine strain showed a characteristic fragment pattern that could easily be differentiated from that of other vaccine and field strains of ADV. The present results demonstrate that the mouse virulence lest and the TK assay detect differences in biological properties of ADV strains, but that restriction endonuclease analysis is required for unambiguous identification of vaccine and field strains of ADV.  相似文献   

9.
Reactive oxygen species (ROS) have been shown to have a role in inflammation. We investigated whether Forsythia suspensa extract (FSE) could exert its antioxidant potential against lipopolysaccharide (LPS)‐induced inflammatory liver injury in rats. Rats were orally fed FSE once daily for 7 consecutive days prior to LPS (Escherichia coli, serotype O55:B5) injection. LPS treatment caused liver dysfunction as evidenced by massive histopathological changes and increased serum alanine aminotransferase and aspartate aminotransferase activities which were ameliorated by FSE pretreatment. FSE attenuated LPS‐induced depletion of cytosolic nuclear factor‐erythroid 2‐related factor 2 (Nrf2) and suppression of Nrf2 nuclear translocation in liver, and the generation of ROS and malondialdehyde in serum and liver. FSE increased the Nrf2‐mediated induction of heme oxygenase‐1 in liver, as well as superoxide dismutase and glutathione peroxidase activities in serum and liver. Importantly, FSE attenuated LPS‐induced nuclear factor‐кB (NF‐кB) nuclear translocation in liver, and subsequently decreased tumor necrosis factor‐α, interleukin (IL)‐1β and IL‐6 levels in serum and liver, which were associated with FSE‐induced activation of Nrf2 in liver. These results indicate that the protective mechanisms of FSE may be involved in the attenuation of oxidative stress and the inhibition of the NF‐кB‐mediated inflammatory response by modulating the Nrf2‐mediated antioxidant response against LPS‐induced inflammatory liver injury.  相似文献   

10.
The canine transmissible venereal tumour (CTVT) is a transmissible cancer that is spread naturally between dogs, with the ability to develop and evade the immune system, despite strict immune surveillance of the host. Furthermore, molecular signalling between cells of the immune system and the tumour microenvironment appear to influence the behaviour and development of the tumour. Thus, this study aimed to quantify the expression of genes related to the immune system such as IL‐6, IFN‐γ, and TGF‐β, as well as angiogenic factors (VEGF, CXCR4), in CTVT cells in vivo and in vitro (primary culture), correlating with the clinical response of the animals treated with vincristine. As expected, the most prevalent subtype was plasmacytoid cells, although lymphocytic cells were also found, indicating the possibility of polyclonality. When we compared the gene expressions of IFN‐γ and IL‐6, we mostly found low expression, concluding that MHC expression was probably not occurring in tumour cells, and no activation of immune cells to eliminate the tumour. The TGF‐β gene was normal in the majority of animals but demonstrated decreased expression in vincristine resistant animals, leading to the hypothesis that the concentration of tumour‐derived TGF‐β was affecting and even suppressing the real TGF‐β expression, favouring tumour proliferation and progression in these cases. VEGF expression was extremely high, demonstrating its angiogenic role in tumour growth, while CXCR4 was decreased, possibly because of CTVT’s low metastatic potential. Thus, we concluded that the tumour microenvironment, together with the immune system of the host, influences CTVT, presumably altering its tumorigenesis and the animal’s clinical response to treatment.  相似文献   

11.
Probiotics have been defined as live microorganisms that are administered in an appropriate amount to provide health benefits to the host animal. In this study, we investigated the effect of L. salivarius DJ‐sa‐01 secreting the 3D8 single‐chain variable fragment (3D8 scFv) on the growth performance, cytokine secretion, and intestinal microbial flora of chickens. The experiment was divided into the control group and L. salivarius expressing 3D8 scFv experimental group. Chicken was fed 109 colony‐forming units (CFUs) of wild‐type (WT) L. salivarius or 3D8 scFv‐secreting L. salivarius daily for 35 days. The administration of L. salivarius expressing 3D8 scFv significantly improved the body weight of chickens compared with the administration of WT L. salivarius. A 16S ribosomal RNA metagenomic analysis showed that Firmicutes, Proteobacteria, Actinobacteria, and Bacteroidetes were the dominant phyla in both experimental groups. At the genus level, Lactobacillus was more abundant (22.82%) in the L. salivarius/3D8 group compared with the WT L. salivarius group. The serum levels of cytokines, such as IL‐8, TNF‐α, IL‐1β, IFN‐γ, IL‐4, and IGF1, were significantly reduced in the L. salivarius/3D8‐treated chickens. In summary, our results suggest that L. salivarius expressing 3D8 scFv could be considered a feed additive for improving the growth performance, immune function, and disease resistance of poultry.  相似文献   

12.
Donalisio, C., Barbero, R., Cuniberti, B., Vercelli, C., Casalone, M., Re, G. Effects of flunixin meglumine and ketoprofen on mediator production in ex vivo and in vitro models of inflammation in healthy dairy cows. J. vet. Pharmacol. Therap.  36 , 130–139. In this study, ex vivo assays were carried out in dairy cows to evaluate the anti‐inflammatory effects of two nonsteroidal anti‐inflammatory drugs: ketoprofen (KETO) and flunixin meglumine (FM). Twelve healthy Holstein dairy cattle were randomly allocated to two groups (n=6): group 1 received FM and group 2 received KETO at recommended therapeutic dosages. The anti‐inflammatory effects of both drugs were determined by measuring the production of coagulation‐induced thromboxane B2 (TXB2), lipopolysaccharides (LPS) (10 μg/mL)‐induced prostaglandin E2 (PGE2), and calcium ionophore (60 μm )‐induced leukotrien B4 (LTB4). Cytokine production was assessed by measuring tumor necrosis factor‐α (TNF‐α), interferon‐γ (IFN‐γ) and interleukin‐8 (CXCL8) concentrations after incubation in the presence of 10 μg/mL LPS. The IC50 of FM and KETO was determined in vitro by determining the concentration of TXB2 and PGE2 in the presence of scalar drug concentrations (10?9–10?3 m ). Both FM and KETO inhibited the two COX isoforms in vitro, but showed a preference for COX‐1. FM and KETO showed similar anti‐inflammatory effects in the cow.  相似文献   

13.
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14.
The objective of the study was to assess the pharmacokinetics of tulathromycin in lung tissue homogenate (LT) and plasma from healthy and lipopolysaccharide (LPS)‐challenged pigs. Clinically healthy pigs were allocated to two dosing groups of 36 animals each (group 1 and 2). All animals were treated with tulathromycin (2.5 mg/kg). Animals in group 2 were also challenged intratracheally with LPS from Escherichia coli (LPS‐Ec) 3 h prior to tulathromycin administration. Blood and LT samples were collected from all animals during 17‐day post‐tulathromycin administration. For LT, one sample from the middle (ML) and caudal lobes (CL) was taken. The concentration of tulathromycin was significantly lower in the ML after the intratracheal administration of LPS‐E. coli (P < 0.02). In healthy pigs and LPS‐challenged animals, the distribution of the drug into the lungs was rapid and persisted at high levels for 17‐day postadministration. The distribution of the drug within the lung seems to be homogenous, at least between the middle and caudal lobes within dosing groups. The concentration versus time profile of the drug and pharmacokinetic parameters in two different lung areas (middle and caudal lobe) were consistent within the groups. The clinical significance of these findings is unknown.  相似文献   

15.
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16.
Background – Recurrent urticaria (RU) is a common skin disease of horses, but little is known about its pathogenesis. Hypothesis/Objective – The aim of this study was to characterize the inflammatory cell infiltrate and cytokine expression pattern in the skin of horses with RU. Animals – Biopsies of lesional and nonlesional skin of horses with RU (n = 8) and of skin from healthy control horses (n = 8) were evaluated. Methods – The inflammatory cell infiltrate was analysed by routine histology. Immunohistochemistry was used to identify T cells (CD3), B cells (CD79), macrophages (MAC387) and mast cells (tryptase). Expression of T‐helper 2 cytokines (interleukins IL‐4, IL‐5 and IL‐13), a T‐helper 1 cytokine (interferon‐γ), IL‐4 receptor α and thymic stromal lymphopoietin was assessed by quantitative RT‐PCR. Results – In subepidermal lesional skin of RU‐affected horses, increased numbers of eosinophils (P ≤ 0.01), CD79‐positive (P ≤ 0.01), MAC387‐positive (P ≤ 0.01) and tryptase‐positive cells (P ≤ 0.05) were found compared with healthy horses. Subepidermal lesional skin of RU‐affected horses contained more eosinophils (P ≤ 0.05) and tryptase‐positive cells (P ≤ 0.05) compared with nonlesional skin. There was no significant difference in infiltrating cells between nonlesional skin and skin of healthy horses. Expression of IL‐4 (P ≤ 0.01), IL‐13 (P ≤ 0.05), thymic stromal lymphopoietin (P ≤ 0.05) and IL‐4 receptor α (P ≤ 0.05) was increased in lesional skin of RU‐affected horses compared with control horses. Expression of IL‐4 was higher (P ≤ 0.05) in lesional compared with nonlesional RU skin. Conclusions and clinical importance – Analysis of cytokine expression and inflammatory infiltrate suggests that T‐helper 2 cytokines, eosinophils, mast cells and presumptive macrophages play a role in the pathogenesis of equine RU.  相似文献   

17.
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18.
The aim of this study was to evaluate the behaviour of adenosine deaminase (ADA) activity, as well as its participation in the immunomodulation of pregnant cows. Thus, sixteen cows were divided into two groups (A and B): the group A was composed by cows not pregnant (n = 8), while the group B was composed by pregnant cows (n = 8). Serum levels of interleukin‐10 (IL‐10), IL‐6, tumour necrosis factor alpha (TNF‐α), reactive oxygen species (ROS) and C‐reactive protein (CRP), as well as ADA and glutathione S‐transferase (GST) activities, were measured on five sampling times (3, 5, 7 and 8 months of gestation, and soon after calving). Serum ADA activity was similar throughout the experiment in the cows belonging to the group A, but its activity increased during the experiment in cows from the group B, that is it was lower in the third and fifth months of pregnancy, and higher on months 7, 8 and after calving when compared to the group A. TNF‐α and IL‐6 serum levels were lower in pregnant cows compared to non‐pregnant animals; however, they significantly increased after calving. Serum levels of IL‐10 increased after 8 months of gestation, but it reduced after calving when compared to the group A, while CRP increased on month 8 of gestation and after calving compared to the group A. Pregnant cows showed lower serum ROS levels on months 3, 5 and 7 of gestation, and higher levels at the post‐partum. Serum GST activity was higher on month 5 of gestation in pregnant cows, but it was lower on months 7, 8 and in the post‐partum compared to the group A. Based on these evidence, we concluded that ADA activity and the others mediators or inflammatory modulators have important role in the maintenance of cow′s gestation due to their immunomodulatory effects.  相似文献   

19.
This study describes the development of an human granulocyte–macrophage colony‐stimulating factor DNA cationic‐lipid complexed autologous tumour cell vaccine (hGM‐CSF CLDC ATCV) and its implementation, following a chemotherapy treatment protocol, in a randomized, placebo‐controlled, double‐blinded clinical trial in pet dogs with naturally occurring lymphoma. We hypothesized that the use of this vaccine would result in an antitumour immune response leading to improved first remission duration and overall survival in dogs with B‐cell lymphoma when compared with chemotherapy alone. Immune stimulation generated by hGM‐CSF CLDC ATCV was assessed by means of surrogate in vivo analysis (delayed‐type hypersensitivity [DTH]) as well as an ex vivo cellular assay (lymphocyte proliferation assay). The vaccine approach considered in the current report did not result in clinically improved outcomes. A small measure of immunomodulation was documented by DTH and several modifications to the approach are suggested. This report illustrates the feasibility of clinical trials with vaccine strategies using companion animals with non‐Hodgkin’s lymphoma.  相似文献   

20.
Uterine inflammatory response is mediated by inflammatory mediators including eicosanoids and cytokines produced by immune and endometrial cells. Interactions between lipopolysaccharide (LPS) and cytokines, and leukotrienes (LTs) in endothelium, important for the host defence during the inflammation, are unknown. We studied the effect of LPS, tumour necrosis factor (TNF)‐α, interleukin (IL)‐1β, IL‐4 and IL‐10 on 5‐lipooxygenase (5‐LO), LTA4 hydrolase (LTAH) and LTC4 synthase (LTCS) mRNA and protein expression, LTB4 and LTC4 release from porcine endometrial endothelial cells, and cell viability. For 24 hr, cells were exposed to LPS (10 or 100 ng/ml of medium) and cytokines (each 1 or 10 ng/ml). 5‐LO mRNA/protein expression augmented after incubation with larger doses of LPS, TNF‐α, IL‐4 and IL‐10 and smaller dose of IL‐1β. Larger dose of TNF‐α, smaller doses of LPS and IL‐1β and both doses of IL‐10 increased LTAH mRNA/protein expression. LTAH protein content was up‐regulated by larger dose of LPS, but it was reduced in response to both doses of IL‐4. LTCS mRNA expression was elevated by larger doses of LPS, IL‐4 and IL‐10 or both doses of TNF‐α and IL‐1β. LTCS protein level increased after treatment with both doses of IL‐1β, IL‐4 and IL‐10, smaller dose of LPS and larger dose of TNF‐α. Both doses of LPS and larger doses of TNF‐α and IL‐10 increased LTB4 release. LPS, IL‐1β and IL‐10 at smaller doses, or TNF‐α and IL‐4 at larger doses stimulated LTC4 release. Smaller doses of TNF‐α and IL‐1β or both doses of IL‐4 enhanced the cell viability. This work provides new insight on the participation of LPS, TNF‐α, IL‐1β, IL‐4 and IL‐10 in LTB4 and LTC4 production/release from porcine endometrial endothelial cells, and the effect of above factors on these cells viability. The used cellular model gives the possibility to further establish the interactions between inflammatory mediators.  相似文献   

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