RÉSUMÉ
Portal vein thrombosis （PVT） refers to thromboembolism that occurs in the extrahepatic main portal vein and/or intrahepatic portal vein branches. PVT is the result of the combined effect of multiple factors， but its pathogenesis remains unclear. Animal models are an important method for exploring the pathophysiological mechanism of PVT. Based on the different species of animals， this article reviews the existing animal models of PVT in terms of modeling methods， principles， advantages and disadvantages， and application.
RÉSUMÉ
Acute-on-chronic liver failure has complex conditions， rapid progression， and a high mortality rate， and further studies are still needed to clarify its pathogenesis and etiology. The establishment of animal models for acute-on-chronic liver failure can not only provide a good basis for exploring the pathogenesis of acute-on-chronic liver failure， but also provide an experimental basis for clinical treatment. Through a literature review， this article summarizes the methods commonly used to establish the animal models of acute-on-chronic liver failure， including carbon tetrachloride combined with LPS/GaIN， thioacetamide combined with LPS， serum albumin， and bile duct ligation. This article analyzes the characteristics of various animal models， so as to provide documentary and experimental bases for further exploration of more ideal animal models.
RÉSUMÉ
Objective:To explore the antitumor effect of ADU-S100/doxorubicin in situ vaccine on diffuse large B-cell lymphoma (DLBCL) and its mechanism.Methods:The 6-week-old female BALB/c mice were selected, and the bilateral murine subcutaneous B-cell lymphoma model was established with murine B-cell lymphoma A20 cells. The subcutaneous tumor-bearing mice were randomly divided into untreated group (without treatment), ADU-S100 in situ vaccine treatment group (intratumoral injection of interferon gene stimulating factor agonist ADU-S100), doxorubicin in situ vaccine treatment group (intratumoral injection of doxorubicin), and ADU-S100/doxorubicin in situ vaccine treatment group (intratumoral injection of ADU-S100 and doxorubicin) by using random number table method, with 5 mice in each group. The right tumors of the bilateral subcutaneous tumor-bearing mice were defined as proximal tumors, and the left tumors of the bilateral subcutaneous tumor-bearing mice were defined as distal tumors. Only the proximal tumors were treated via the intratumoral route, and the distal tumors were not treated. On day 23 after tumor inoculation, the percentages of CD11c + dendritic cells (DC), CD8 + CD11c + DC and CD80 + CD11c + DC in the spleen of mice in each group were detected by flow cytometry. The splenocytes of mice in each group were stimulated with A20 tumor cell lysate in vitro, the percentages of 5'-ethynyl-2'-deoxyuridine-positive (EdU +) cells and tumor necrosis factor-α-positive (TNF-α +) cells in CD8 + T cells in each in situ vaccine treatment group were detected by flow cytometry, and the killing effect of cytotoxic T lymphocyte (CTL) in each group was measured by using the lactate dehydrogenase (LDH) cytotoxicity assay kit. The mice treated with ADU-S100/doxorubicin in situ vaccine were intraperitoneally injected with anti-mouse CD8α (clone 53-6.7) mAb or isotype control on days 7, 12 and 17 after tumor inoculation to eliminate CD8 + cells. On day 23 after tumor inoculation, the proximal and distal tumor volumes of mice in the ADU-S100/doxorubicin in situ vaccine combined with anti-mouse CD8α (clone 53-6.7) mAb or isotype control treatment group were measured, the percentages of CD8 + T cells and CD8 + CD11c + DC in the spleen of tumor-bearing mice in these two groups were detected by flow cytometry, and the infiltration of CD8 + T cells in the tumor tissues from these two groups was detected by immunohistochemistry (IHC) staining. Results:On days 11, 14, 17, 20 and 23 after tumor inoculation, the proximal and distal tumor volumes of mice in each treated group were lower than those in the untreated group (all P < 0.05). The proportions of CD11c + DC in the spleen of the untreated group, ADU-S100 in situ vaccine treatment group, doxorubicin in situ vaccine treatment group and ADU-S100/doxorubicin in situ vaccine treatment group were (4.92±0.63)%, (7.54±0.84)%, (7.45±0.86)% and (11.63±0.85)%, respectively, and the difference was statistically significant ( F = 72.30, P < 0.001); the proportions of CD8 + CD11c + DC were (1.36±0.34)%, (4.02±0.43)%, (4.22±0.61)% and (6.11±0.73)%, respectively, and the difference was statistically significant ( F = 76.09, P < 0.001); the proportions of CD80 + CD11c + DC were (0.51±0.24)%, (1.69±0.23)%, (1.82±0.25)% and (4.09±0.39)%, respectively, and the difference was statistically significant ( F = 167.40, P < 0.001). The CTL responses and the proportion of EdU + cells and TNF-α + cells in CD8 + T cells in each in situ vaccine treatment group were higher than those in the untreated group (all P < 0.05). Furthermore, the enhanced CTL responses and the increased proportion of EdU + cells and TNF-α + cells in CD8 + T cells were observed in the ADU-S100/doxorubicin in situ vaccine treatment group as compared to the ADU-S100 in situ vaccine treatment group and doxorubicin in situ vaccine treatment group (all P < 0.05). The proportions of CD8 + T cells and CD8 + CD11c + DC in the spleen of mice treated with ADU-S100/doxorubicin in situ vaccine and anti-mouse CD8α mAb were lower than those in ADU-S100/doxorubicin in situ vaccine and isotype control group (both P < 0.05) and both proximal and distal tumor volumes of mice treated with ADU-S100/doxorubicin in situ vaccine and anti-mouse CD8α mAb were larger than those in ADU-S100/doxorubicin in situ vaccine and isotype control group (both P < 0.05). Conclusions:ADU-S100/doxorubicin in situ vaccine can induce profound regression of proximal tumors in bilateral murine subcutaneous B-cell lymphoma model and generate systemic immune responses capable of partially inhibiting distant tumor growth, and the antitumor efficacy of ADU-S100/doxorubicin in situ vaccine may require CD8 + CD11c + DC-mediated CD8 + T cell immune responses.
RÉSUMÉ
OBJECTIVE To explore the expression changes of TLR4/MyD88/NF-κB signaling pathways in olfactory disorders.METHODS There were 40 healthy BALB/c mice who were divided into an observation group and a control group,with 20 mice in each group.Detection of Toll-like receptors(TLR4),myeloid differentiation primary response gene 88(MyD88)and nuclear factor kappa B(NF-κB)in mice using quantitative reverse transcription PCR level;Detection of TLR4,MyD88 and NF-κB by Western blot(WB)test protein content;Immunohistochemical detection of the expression of mouse olfactory marker protein(OMP).RESULTS There was no significant difference in foraging time between the two groups of mice before modeling(P>0.05),after modeling,the foraging time of the observation group mice was significantly longer than that of the control group(P<0.05);The relative mRNA expression level of TLR4,MyD88 and NF-κB in the nasal epithelium of mice in the observation group was significantly higher than that of the control group(P<0.05);The protein expression of TLR4,MyD88 and NF-κB in the nasal epithelium of mice in the observation group was significantly higher than that of the control group(P<0.05);The level of OMP protein in the nasal epithelium of the observation group was significantly lower than that of the control group(P<0.05).CONCLUSION Expression reinforcement of TLR4/MyD88/NF-κB signaling pathway in a mouse model of olfactory dysfunction.
RÉSUMÉ
Craniocerebral injury with seawater immersion is a special kind of compound injury, with low temperature, high permeability, high alkali, high salt content, and bacterial infection being the main causes. The injury is also characterized with complex damage mechanisms, difficulty to treat, and poor prognosis. At present, the damage mechanisms of craniocerebral injury with seawater immersion are mainly studied by establishing the experimental animal models at the levels of tissue, cell, organelle, molecule, etc. However, the craniocerebral injury with seawater immersion is more complex than the simple onshore craniocerebral injury, therefore, a stable disease model is not easy to construct. Most researches on the specific injury mechanisms are relatively single and one-sided, with many different views in existence, and the damage mechanisms of craniocerebral injury with seawater immersion have hitherto not been clear. The authors reviewed the research progress in the damage mechanisms of craniocerebral injury with seawater immersion, in order to promote the in-depth study of the mechanism of craniocerebral injury with seawater immersion and provide reference for its clinical treatment.
RÉSUMÉ
Objective:To examine the impact of berberine on polycystic ovary syndrome (PCOS) in mice, and to investigate the effects of berberine on the intestinal flora and the intestinal flora on PCOS.Methods:A mouse model of PCOS was established by administering dehydroepiandrosterone in combination with high fat diet, and the mouse model was given a berberine treatment. The study consisted of a blank control group (C group), a PCOS model group (M group) and a berberine treatment group (T group). During the experiment, the mice were closely monitored through timed body weight measurements and estrous cycle monitoring; intraperitoneal glucose tolerance test and insulin tolerance test were done. Upon completion of the pharmacological intervention, the wet weights of liver, ovary and fat deposits of mice were assessed and subjected to HE staining to confirm the success of PCOS modeling and the efficacy of berberine. Additionally, fecal samples were analyzed for intestinal flora through 16S rRNA analysis.Results:The PCOS model was established successfully, berberine alleviated the disturbance of estrous cycle in mice, and significantly alleviated fat accumulation and metabolic abnormalities of glucose in mice. The cross-sectional area of fat pad cells in T group was (2 858±146) μm2, which was significantly lower than that in M group [(9 518±347) μm2], and the difference was statistically significant ( P<0.001). The blood glucose levels in T group were significantly lower than those in M group ( P<0.05). The composition and structure of intestinal flora in mice of M group with PCOS (compared with C group) and in mice of T group after berberine intervention (compared with M group) were significantly altered. However, alpha diversity did not change significantly among three groups ( P>0.05). Conclusion:Berberine could alleviate PCOS by intervening in the alterations of gut microbiota.
RÉSUMÉ
Objective To investigate the effect of electroacupuncture at Lianquan point on nerve function deficit in post-stroke dysphagia(PSD)rats and its potential effect on regulating of transi-ent receptor potential vanilic acid subtype 1(TRPV1)signaling pathway.Methods A total of 60 male SD rats with SPF grade were randomly divided into a normal group of 12(only mild inser-tion of the thread,which did not lead to intracerebral artery occlusion),and the remaining 48 rats were established into PSD models.The 36 rats successfully made were randomly divided into mod-el group,treatment group and treatment+caffeic acid group,with 12 rats in each group.The la-tency and frequency of swallowing were recorded.Biological signal collector was applied to detect hypoglossal nerve discharge,lingual muscle threshold intensity,and contraction amplitude.ELISA was employed to detect the content of substance P in serum,toluidine blue staining was conducted to count the number of Nissl bodies in the hypoglossal nucleus,and immunohistochemistry was applied to measure the expression levels of TRPV1,serotonin(5-HT),phosphorylation(p)-p38,and neuronal nitric oxide synthase(nNOS)in the hypoglossal nucleus.Results Compared with the normal group,the model group had shorter swallowing latency,less swallowing frequency,and decreased integrated area of hypoglossal nerve discharge,amplitude of tongue muscle contrac-tion,serum substance P content,threshold strength of tongue muscle,number of Nissl bodies,and the expression levels of TRPV1 and 5-HT,but increased threshold intensity of tongue muscles and expression levels of p-p38 and nNOS in the hypoglossal nucleus(P＜0.05).Compared with the model group,the amplitude of tongue muscle contraction,serum substance P content,number of Nissl bodies,and the expression levels of TRPV1 and 5-HT proteins in rats in the treatment group were increased[2.36±0.26 vs 1.77±0.22,3.46±0.36 vs 2.15±0.18,(3.92±0.38)ng/ml vs(1.69±0.17)ng/ml,(33.60±3.65)vs(24.60±2.34),(19.85±2.11)％vs(9.79±1.07)％,(22.43± 2.34)％vs(10.85±1.13)％,P＜0.05].Conclusion Electroacupuncture at Lianquan point may improve neurological deficits in PSD rats by activating the TRPV1 signaling pathway.
RÉSUMÉ
Objective To investigate the role and underlying mechanism of atorvastatin on hyper-glycemia induced hemorrhagic transformation(HT)in a mouse model of cerebral ischemia.Meth-ods A total of 36 SPF-grade male C57BL/6 mice were randomly divided into sham operation group,HT model group and atorvastatin group,with 12 mice in each group.HE staining was used to observe cerebral hemorrhage,immunofluorescent staining was employed to detect the integrity of blood-brain barrier,and Western blotting was applied to measure the protein expression of IgG,ZO-1,occludin,claduin5,MMP-2 and-9 in ischemic penumbra brain tissues.Results Com-pared with sham operation group,the neurological deficit score,mortality rate,HT incidence,HT grading score,IgG fluorescence intensity,and protein levels of IgG,MMP-2 and-9 were signifi-cantly increased,while the protein levels of ZO-1,occludin and claudin5 were obviously decreased in the HT model group(P＜0.01).Atorvastatin treatment resulted in significantly lower neuro-logical deficit score(2.73±1.19 vs 3.91±0.94),mortality rate(16.7％vs 41.6％),HT incidence(58.3％vs 91.6％),HT grading score(1.00±1.04 vs 2.58±1.13),IgG fluorescence intensity(504.30±105.52 a.u vs 859.91±153.28 a.u),and protein levels of IgG(4.55±1.40 vs 12.06± 3.73),MMP-2(1.87±0.41 vs 2.95±0.68)and-9(1.47±0.24 vs 2.12±0.23)(P＜0.05,P＜0.01),and increased protein levels of ZO-1(1.55±0.20 vs 0.53±0.10),occludin(0.92±0.11 vs 0.35±0.07)and claudin5(0.58±0.04 vs 0.30±0.05)(P＜0.01)when compared with the HT model group.Conclusion Atorvastatin can reduce the permeability of blood-brain barrier by in-hibiting the activation of MMP-2 and MMP-9 and up-regulating the protein levels of ZO-1,occlu-din and claudin5,and thus attenuate hyperglycemia-induced HT.
RÉSUMÉ
Objective To investigate the action mechanism of long non-coding RNA(lncRNA)-N1LR on blood-brain barrier(BBB)after cerebral ischemia-reperfusion(I/R)injury.Methods Primary rat brain microvascular endothelial cells(BMECs)were cultured and treated with OGD/R to simulate cerebral I/R injury.The experiment was divided into normal control group,ln-cRNA-N1LR OGD group,overexpression group(lncRNA-N1LR overexpression after OGD treat-ment)and silence group(lncRNA-N1LR silence after OGD treatment).The mRNA levels of ln-cRNA-N1LR,claudin-5 and occludin in each group were detected by RT-qPCR.The BBB permea-bility was detected by FITC-dextran infiltration assay.The expression of claudin-5 and occludin were detected by Western blotting.Results The mRNA levels of lncRNA-N1LR,occludin and claudin-5 were significantly decreased(0.31±0.01 vs 1.00±0.10,0.42±0.03 vs 1.01±0.13,0.38±0.03 vs 1.00±0.15,P＜0.05),and the BBB permeability was significantly increased(58.79± 3.04 vs 8.87±0.63,P＜0.05)in the OGD group than the control group.The lncRNA-N1LR over-expression group increased the mRNA expression of lncRNA-N1LR,occludin and claudin-5(0.67±0.07 vs 0.31±0.01,0.92±0.02 vs 0.42±0.03,0.70±0.08 vs 0.38±0.03,P＜0.05),and decreased the BBB permeability(41.57±2.43 vs 58.79±3.04,P＜0.05)than the OGD group.lncRNA-N1LR silence resulted in lower mRNA levels of lncRNA-N1LR,occludin and claudin-5(0.21±0.02 vs 0.31±0.01,0.31±0.03 vs 0.42±0.03,0.22±0.02 vs 0.38±0.03,P＜0.05),and enhanced BBB permeability(72.34±1.43 vs 58.79±3.04,P＜0.05)when compared with the OGD group.Conclusion Up-regulation of lncRNA-N1LR may play a neuroprotective role by reducing BBB permeability.
RÉSUMÉ
Objective To investigate the role of Smad signaling pathway in rat model of cerebral in-farction and explore the expression of insulin-like growth factor binding protein 3(IGFBP-3)in brain tissue and its relationship with neural function.Methods Sixty healthy adult male SD rats were randomly and equally divided into model group,sham-operation group,and normal control group.The model of cerebral infarction was established by using intraluminal thread occlusion,and the rats of the sham-operation group were only given exposure of the internal carotid artery and direct suture of the incision.In 1 week after successful modeling,Modified Neurological Seve-rity Score(mNSS)was used to evaluate the neurological function.HE staining was employed to observe the histopathological changes in the brain tissues.Western blotting and RT-PCR were adopted to detect the brain expression of IGFBP-3,Smad2 and Smad4 at protein and mRNA le-vels.Spearman correlation analysis was conducted to analyze the correlation among the expression levels of IGFBP-3,Smad2,Smad4 and P21.Results HE staining displayed that obvious brain ede-ma,characterized by disordered arrangement of brain cells,increased microglia,and blurred nucleo-lus of brain cells were observed in the rats of the model group,with the area of cerebral infarct of 20.55％.The mNSS score and the protein and mRNA levels of IGFBP-3,Smad2 and Smad4 were significantly higher,but the P21 protein and mRNA levels were obviously reduced in the model group than the sham-operation group and normal control group(P＜0.05,P＜0.01).Spearman correlation analysis showed that the mRNA level of IGFBP-3 in cerebral infarction rats was posi-tively correlated with the mNSS score and mRNA expression levels of Smad2 and Smad4(r=0.568,r=0.623,r=0.597;P＜0.01),and negatively with P21 mRNA level in the brain tissue(r=-0.573;P＜0.01).Conclusion The level of IGFBP-3 is significantly increased in brain tissue of rats with cerebral infarction,and it is closely associated with neural function of these rats,which may be related to Smad signaling pathway.
RÉSUMÉ
Objective To determine the improved effect of methylene blue(MB)on cognitive func-tion in brain-inflammatory-aging rats and investigate the underlying mechanism.Methods A total of 38 healthy 12-month-old SD rats were randomly divided into healthy control group,lipopo-lysaccharide(LPS)group,MB vehicle group and MB group,with 8 rats in the control and 10 rats in the other three groups.LPS was injected into the fourth ventricle with aid of a subcutaneous sustained release pump to establish a rat model of brain chronic inflammatory aging.MB of 0.5 mg/(kg·d)was added into the pump in the rats from the MB group.T-maze test and new object recognition test were employed to evaluate the learning and memory abilities of the rats.The acti-vation of microglia and astrocytes in the hippocampal CA1 region of the rats was detected by im-munofluorescence assay.The release of inflammatory factors IL-1β and IL-6 was measured by ELISA,and neuronal death in the CA1 region was assessed by neuronal nuclei(NeuN)fluores-cence staining.Results There was no significant difference in the exploration time for new and old objects between the LPS group and the MB solvent group(P＞0.05).The MB group spent significantly longer time in exploring the new objects than the old object(22.50±4.32 s vs 11.60± 3.01 s,P=0.000).The alternating selection rate of new arm and expression level of NeuN antigen were significantly decreased,and the expression levels of ionized calcium binding adaptor mole-cule-1(Iba-1)and glial fibrillary acidic protein(GFAP)and the contents of IL-1β and IL-6 were obviously increased(P＜0.05)in the LPS group and the MB vehicle group than the healthy con-trol group.Compared with the MB vehicle group,the MB group had notably increased alternating selection rate of new arms and higher NeuN expression level,and decreased Iba-1 and GFAP ex-pression and IL-1β and IL-6 contents(P＜0.05).Conclusion Subcutaneous administration of MB could significantly inhibit the damages of spatial learning and memory abilities in the LPS-induced brain chronic inflammatory aging rats.The mechanism may be closely associated with MB inhibi-ting inflammatory glial cells and protecting hippocampal pyramidal neurons.
RÉSUMÉ
Objective:To observe and analyze depression-like behavioral performances of mouse models of vitiligo.Methods:Fifteen female C57BL/6 mice aged about 9 weeks were modeled for vitiligo. Whether the mouse models of vitiligo were successfully constructed or not was determined by macroscopy and full-thickness epidermal immunofluorescence staining of mouse tail tissues on day 23 after the start of the experiment; on day 8 (pre-modeling stage) and day 21 (early modeling stage), the elevated plus maze test and the open field test were used to evaluate the behavioral performances of the mice, including the number of entry into the open arms, percentages of time spent in the open arms, percentages of time spent in the central area and total distance traveled, aiming to assess whether depression-like behaviors were exhibited in the mouse models of vitiligo. To further clarify the degree of the impact of vitiligo modeling on the depression-like state in mice, 20 female C57BL/6 mice were equally divided into 2 groups: vitiligo modeling group and vitiligo modeling + chronic restraint stress group; the mice in the vitiligo modeling + chronic restraint stress group were subjected to chronic restraint stress on day 9, that is, these mice were placed in centrifuge tubes and restrained for about 6 hours every day for 28 consecutive days; on days 7, 22, 29 and 38 after the start of vitiligo modeling, the above-mentioned behavioral indicators were determined by the elevated plus maze test and open field test in the 2 groups. Repeated measurement data in a single group were compared before and after treatment by using paired t-test, and repeated measurement data at multiple time points were compared by using two-way repeated measures analysis of variance. Results:By macroscopy, the mice gradually developed well-defined white patches on the tail skin during vitiligo modeling, which were similar to the clinical manifestations of vitiligo patients; on day 23, full-thickness epidermal immunofluorescence staining of the mouse tail tissues was conducted and showed obvious infiltration of CD8 + T cells and a decrease in the number of Melan-A-positive epidermal melanocytes under a laser confocal microscope, which were consistent with typical pathological characteristics of vitiligo; based on the macroscopic results and immunofluorescence findings, a total of 12 mouse models of vitiligo were successfully constructed on day 23. The elevated plus maze test showed that the number of entry into the open arms and the percentages of time spent in the open arms were significantly lower in the 12 mouse models of vitiligo on day 21 (2.33 ± 1.78 times, 5.01% ± 5.27%, respectively) than in those on day 8 (10.75 ± 2.30 times, 29.20% ± 12.48%, t = 9.63, 6.36, respectively, both P < 0.001) ; the open field test showed that the percentages of time spent in the central area and total distance traveled were also significantly lower in the mouse models on day 21 (2.31% ± 1.53%, 2 518.31 ± 528.38 cm, respectively) than in those on day 8 (4.47% ± 2.65%, 3 533.45 ± 465.47 cm, t = 2.40, 5.47, P = 0.036, < 0.001, respectively). In the chronic restraint stress test, a total of 14 mouse models of vitiligo were successfully constructed on day 23, including 5 in the vitiligo modeling group and 9 in the vitiligo modeling + chronic restraint stress group. There were no significant differences in the number of entry into the open arms, percentages of time spent in the open arms, percentages of time spent in the central area, and total distance traveled between the vitiligo modeling group and the vitiligo modeling + chronic restraint stress group on days 7, 22, 29, and 38 ( F = 0.21, 0.20, 0.46, 2.35, P = 0.889, 0.893, 0.719, 0.134, respectively) ; moreover, all the above indicators significantly changed over time (all P < 0.001), except for the total distance traveled ( P = 0.422) . Conclusion:The mouse models of vitiligo developed depression-like behavior at the early modeling stage, and the degree of depression could not be further deepened by chronic restraint stress on the basis of vitiligo modeling.
RÉSUMÉ
ObjectiveTo establish a nude mouse model of type 2 diabetes mellitus （T2DM） and pancreatic cancer that allows dynamic observation of tumor formation process and facilitates in vivo research. MethodsAt first， human pancreatic cancer PANC-1 cells were transfected with lentiviral vector GV260 to construct the pancreatic cancer cell line PANC-1-Luc with stable expression of firefly luciferase. Then， 36 specific pathogen-free nude mice were randomly divided into control group with 12 mice and model group with 24 mice （nude mice with T2DM and pancreatic cancer）. The mice in the control group were fed with breeding diet and were then given ectopic subcutaneous implantation of PANC-1-Luc cells， and those in the model group were first given high-fat diet and intraperitoneal injection of 1% STZ， followed by ectopic subcutaneous implantation of PANC-1-Luc cells. The fluorescence in vivo imaging system and the manual measurement method were used for simultaneous and dynamic monitoring of the growth of pancreatic cancer in nude mice in the two groups， and the tumor growth curve was plotted to investigate the correlation between fluorescence value and tumor volume. Subcutaneous tumors and pancreatic islets were observed under a microscope to verify whether the model was successfully established， and immunohistochemistry was used to measure the expression of Ki-67 in tumor tissue to investigate the influence of hyperglycemia on the growth of pancreatic cancer in nude mice. The independent-samples t test was used for comparison of normally distributed continuous data between groups， and the Mann-Whitney U test was used for comparison of non-normally distributed continuous data between groups. ResultsThe optimal virus titer was determined as 5×107 TU/mL for the stable transfection of lentiviral vector in PANC-1 cells， and the optimal concentration selected with puromycin was 20 μg/mL， with an optimal selection time of 9 days. The fluorescence value of PANC-1-Luc cells was linearly and positively correlated with the number of cells， with the linear equation of y=42.56x－42 504 （r=0.977， P=0.004）. The blood glucose value of T2DM nude mice was 23.05 （19.25 — 26.40） mmol/L， with a blood glucose level of >11.1 mmol/L in each nude mouse， and there was a significant difference in blood glucose value between the T2DM nude mice and the control nude ［6.15 （5.20 — 7.30） mmol/L］ （Z=-8.45， P<0.001）. Compared with the control group， the model group had reductions in the number and volume of pancreatic islets， with irregular shapes and unclear boundaries， and pathological examination confirmed that the xenograft tumor was pancreatic cancer tissue， which showed that the model was established successfully. In the model group， there was a linear positive correlation between subcutaneous tumor size and fluorescence values， with the linear equation of y=232 348 691x－8 258 608 （r=0.911， P=0.031）. The model group had a significantly higher positive rate of Ki-67 than the control group （50.333%± 7.808% vs 15.917%±4.055%， t=13.55， P<0.001）， suggesting rapid tumor proliferation in the model group. ConclusionThe T2DM nude mouse model of pancreatic cancer established in this study can simulate the pathological process of the development and progression of pancreatic cancer in the context of T2DM and dynamically observe the influence of hyperglycemia on the growth of pancreatic cancer cells in vivo， thereby providing a new experimental vector for the in vivo study of the development and progression of pancreatic cancer in the context of T2DM.
RÉSUMÉ
Abstract Objective Although autologous bone grafting is the most widely used treatment for bone defects, the most effective preparation remains unclear. This animal study aimed to compare different autologous bone grafting preparation for the treatment of rats calvaria critical bone defect. Methods 122 rats were randomly allocated into three groups: Simulado, Macerated and Chopped. The specimens underwent craniotomies at the top center of their calvarias with a 7mm diameter circumferential cutter drill. The critical bone defect produced was treated or not according to the group the specimen wasallocated. The rats were euthanized at 3, 6 or 12 weeks post-op and its calvarias were analyzed by histomorphometry, bone densitometry, nanocomputed tomography (nCT), and biomechanical tests. Results The histomorphometry analysis showed the highest percentage of fulfillment of the critical bone defect in the chopped and macerated group when compared to simulado. The densitometry assessment evidenced higher bone mass at all endpoints analysis (p < 0.05) in the chopped group. The nCT data exhibited an expressive increase of bone in the chopped group when compared with the simulado and macerated groups. The biomechanical tests exhibited highest values of deformation, maximum force, and relative stiffness in the chopped group at any time of euthanasia (p < 0.05). Conclusions Our experimental work showed that chopped bone grafting preparation exhibited significant better outcomes than macerated in the treatment of a critical bone defect in rats calvaria.
Resumo Objetivo Embora enxertos ósseos autólogos sejam o tratamento mais utilizado para defeitos ósseos, a preparação mais eficaz ainda é obscura. Este estudo animal teve como objetivo comparar diferentes preparações de enxerto ósseo autólogo para o tratamento de defeito ósseo crítico no crânio de ratos. Métodos No total, 122 ratos foram alocados aleatoriamente em três grupos: Simulado, enxerto macerado e enxerto picado. Os espécimes foram submetidos a craniotomias no centro superior do crânio com broca de corte circunferencial de 7 mm de diâmetro. O defeito ósseo crítico produzido foi tratado ou não de acordo com o grupo de alocação do animal. Os ratos foram eutanasiados às 3, 6 ou 12 semanas após a cirurgia e seus crânios foram analisados por histomorfometria, densitometria óssea, nanotomografia computadorizada (nTC) e testes biomecânicos. Resultados A análise histomorfométrica mostrou maior percentual de preenchimento do defeito ósseo crítico no grupo picado e macerado em comparação ao simulado. A avaliação densitométrica evidenciou maior massa óssea em todos os desfechos de análise (p < 0,05) no grupo picado. Os dados de nTC revelaram um aumento ósseo expressivo no grupo picado em comparação aos grupos simulado e macerado. Os testes biomecânicos mostraram maiores valores de deformação, resistência máxima e rigidez relativa no grupo picado em qualquer momento da eutanásia (p < 0,05). Conclusões Nosso estudo mostrou que a preparação de enxerto ósseo picado gerou resultados significativamente melhores do que os enxertos macerados no tratamento de defeitos ósseos críticos no crânio de ratos.
RÉSUMÉ
ABSTRACT Purpose: This study aimed to evaluate a new therapeutic option for the spasticity using ultrasound neuromodulation in an animal model of spastic cerebral palsy. Methods: Thirty-two adult male Wistar rats were randomly distributed in: negative control (NC); positive control (PC); untreated model (UTM); and treated model (TM). Rats in the control groups received sham surgery, and rats in the model groups received the spastic cerebral palsy model surgery. The rats' motor functions were evaluated by the Rotarod and CatWalk tests before and after surgery. PC and TM groups underwent ultrasonic neuromodulation by a physiotherapeutic ultrasound (intensity 0.1 W/cm2, at 1 MHz) continuous mode for 5 seconds, for seven days. Results: Twelve rats showed a spastic pattern (UTM = 6 and TM = 6), motor limitations (UTM = 6 and TM = 6), and ten had difficulty feeding (UTM = 5 and TM = 5). One UTM group rat could not recover its preoperative latency time, while the other rats in the model groups did. The speed at which the limbs swung reduced after surgery and increased in subsequent assessments, demonstrating greater instability and a deficit in locomotion balance. Conclusions: Results were not yet sufficient to assert ultrasound neuromodulation as a possible therapy for spasticity in spastic cerebral palsy in the parameters used, and more studies are necessary.
RÉSUMÉ
Introdução: a hanseníase é uma do-ença infecciosa crônica causada pelo Mycobacterium leprae (M. leprae), um para-sita intracelular obrigatório. Assim, a resis-tência do hospedeiro a esse patógeno depen-de da imunidade celular. O uso de modelos experimentais tem permitido o estudo da hanseníase do ponto de vista imunológico, microbiológico e terapêutico, entretanto, as diferenças na progressão da infecção entre os modelos mais empregados (camundongos imunocompetentes, BALB/c, e camundongos congenitamente atímicos, nude) são pouco estudadas. Objetivo: comparar a evolução da infecção pelo M. leprae em camundongos BALB/c e nude quanto à multi-plicação bacilar e avaliação do perfil inflamatório sistêmico pela quantificação sérica de citocinas e óxido nítrico (NO). Métodos: os camundongos foram inoculados com M. leprae nos coxins plantares e avaliados aos 3, 5 e 8 meses após a infecção. Resultados: camundongos nude apresentaram multiplicação bacilar progressiva nos coxins plantares. Em camundongos BALB/c, o número de bacilos foi maior aos 5 meses. Em relação à quantificação de citocinas, nos camundongos BALB/c houve aumento de IL-2 e IL-17A e diminuição de IL-6 e NO aos 8 meses de inoculação. Nos camundongos nude, verificou-se o aumento do TNF aos 8 meses de inoculação e manutenção dos níveis de NO. Conclusão: os resultados encontrados sugerem que em camundongos BALB/c ocorre a ativação de uma resposta imune capaz de controlar a multiplicação do M. leprae, em contrapartida em camundongos nude a infecção é progressiva a despeito de altos níveis de TNF. (AU)
Introduction: leprosy is a chronic infectious disease caused by Mycobacterium leprae (M. leprae), an obligate intracellular parasite. Thus, host resistance to this pathogen depends on cellular immunity. The use of experimental models has made it possible to study leprosy from an immunological, microbiological, and therapeutic point of view. However, the differences in the progression of the infection between the most used models (immunocompetent mice, BALB/c, and congenitally athymic mice, nude) have been little studied. Objective: to compare the evolution of M. leprae infection in BALB/c and nude mice in terms of bacillary multiplication and evaluation of the systemic inflammatory profile by quantifying serum cytokines and nitric oxide (NO). Methods: the mice were inoculated with M. leprae in the footpads and evaluated at 3, 5, and 8 months after infection. Results: nude mice showed progressive bacillary multiplication in the footpads. In BALB/c mice, the number of bacilli was higher at 5 months. In terms of cytokine quantification, BALB/c mice showed an increase in IL-2 and IL-17A and a decrease in IL-6 and NO at 8 months of inoculation. In the nude mice, there was an increase in TNF at 8 months of inoculation and maintenance of NO levels. Conclusion: the results suggest that BALB/c mice activate an immune response capable of controlling the multiplication of M. leprae, whereas in nude mice the infection is progressive despite high levels of TNF. (AU)
Sujet(s)
Animaux , Souris , Lèpre/immunologie , Immunité cellulaire , Animaux de laboratoireRÉSUMÉ
ABSTRACT Purpose: This study aimed to introduce and evaluate two new microvascular anastomosis techniques compared to the conventional method in a rat renal transplant model. Methods: Using a Fisher-to-Lewis rat kidney transplantation model, the renal artery anastomosis was performed using the interrupted (I) suture technique, Y-shaped continuous (Y) suture technique, and anterior-interrupted and posterior-continuous (I-C) suture technique. The rats were then divided into three groups: I group, Y group, and I-C group. Parameters such as arterial anastomosis time, warm ischemia time, seven-day survival rate of the rats, and vessel histopathology were assessed. Results: The mean arterial anastomosis time, blood leakage scores, and warm ischemia time were significantly reduced in groups Y and I-C compared to group I. Moreover, the seven-day survival rate was significantly higher in the I-C group compared to the other two groups. Arterial histopathology demonstrated vessel wall recovery without damage in all three groups, suggesting the safety of both Y and I-C techniques. Conclusions: The anterior-interrupted and posterior-continuous suture method is particularly beneficial for small artery reconstruction in organ transplantation.
RÉSUMÉ
ABSTRACT Objective: To assess the effect of atelectasis during mechanical ventilation on the periatelectatic and normal lung regions in a model of atelectasis in rats with acute lung injury induced by lipopolysaccharide. Methods: Twenty-four rats were randomized into the following four groups, each with 6 animals: the Saline-Control Group, Lipopolysaccharide Control Group, Saline-Atelectasis Group, and Lipopolysaccharide Atelectasis Group. Acute lung injury was induced by intraperitoneal injection of lipopolysaccharide. After 24 hours, atelectasis was induced by bronchial blocking. The animals underwent mechanical ventilation for two hours with protective parameters, and respiratory mechanics were monitored during this period. Thereafter, histologic analyses of two regions of interest, periatelectatic areas and the normally-aerated lung contralateral to the atelectatic areas, were performed. Results: The lung injury score was significantly higher in the Lipopolysaccharide Control Group (0.41 ± 0.13) than in the Saline Control Group (0.15 ± 0.51), p < 0.05. Periatelectatic regions showed higher lung injury scores than normally-aerated regions in both the Saline-Atelectasis (0.44 ± 0.06 x 0.27 ± 0.74 p < 0.05) and Lipopolysaccharide Atelectasis (0.56 ± 0.09 x 0.35 ± 0.04 p < 0.05) Groups. The lung injury score in the periatelectatic regions was higher in the Lipopolysaccharide Atelectasis Group (0.56 ± 0.09) than in the periatelectatic region of the Saline-Atelectasis Group (0.44 ± 0.06), p < 0.05. Conclusion: Atelectasis may cause injury to the surrounding tissue after a period of mechanical ventilation with protective parameters. Its effect was more significant in previously injured lungs.
RESUMO Objetivo: Avaliar o efeito da atelectasia durante a ventilação mecânica nas regiões periatelectáticas e pulmonares normais em um modelo de atelectasia em ratos com lesão pulmonar aguda induzida por lipopolissacarídeo. Métodos: Foram distribuídos aleatoriamente 24 ratos em quatro grupos, cada um com 6 animais: Grupo Salina-Controle, Grupo Lipopolissacarídeo-Controle, Grupo Salina-Atelectasia e Grupo Lipopolissacarídeo-Atelectasia. A lesão pulmonar aguda foi induzida por injeção intraperitoneal de lipopolissacarídeo. Após 24 horas, a atelectasia foi induzida por bloqueio brônquico. Os animais foram submetidos à ventilação mecânica por 2 horas com parâmetros ventilatórios protetores, e a mecânica respiratória foi monitorada durante esse período. Em seguida, foram realizadas análises histológicas de duas regiões de interesse: as áreas periatelectásicas e o pulmão normalmente aerado contralateral às áreas atelectásicas. Resultados: O escore de lesão pulmonar foi significativamente maior no Grupo Controle-Lipopolissacarídeo (0,41 ± 0,13) do que no Grupo Controle-Solução Salina (0,15 ± 0,51), com p < 0,05. As regiões periatelectásicas apresentaram escores maiores de lesão pulmonar do que as regiões normalmente aeradas nos Grupos Atelectasia-Solução Salina (0,44 ± 0,06 versus 0,27 ± 0,74, p < 0,05) e Atelectasia-Lipopolissacarídeo (0,56 ± 0,09 versus 0,35 ± 0,04, p < 0,05). O escore de lesão pulmonar nas regiões periatelectásicas foi maior no Grupo Atelectasia-Lipopolissacarídeo (0,56 ± 0,09) do que na região periatelectásica do Grupo Atelectasia-Solução Salina (0,44 ± 0,06), p < 0,05. Conclusão: A atelectasia pode causar lesão no tecido circundante após um período de ventilação mecânica com parâmetros ventilatórios protetores. Seu efeito foi mais significativo em pulmões previamente lesionados.
RÉSUMÉ
Abstract Objective To reproduce in an animal model the surgical technique of Masquelet used in the treatment of critical bone defects and to analyze the characteristics of the membrane formed around the bone cement. Methods A 10mm critical defect was created in the femoral shaft of 21 Sprague-Dawley rats. After resection of the central portion of the diaphysis, the defect was stabilized with a Kirschner wire introduced through the medullary canal and with the interposition of a bone cement spacer. After 2, 4, and 6 weeks of the surgical procedure, the animals were euthanized and evaluated on radiographs of the posterior limb regarding the size of the defect, alignment and stability of the osteosynthesis. The membranes formed around the spacer were subjected to histological analysis to assess thickness, connective tissue maturation and vascular density. Results Over time, the membranes initially made up of loose connective tissue were replaced by membranes represented by dense connective tissue, rich in thick collagen fibers. At six weeks, membrane thickness was greater (565 ± 208μm) than at four (186.9 ± 70.21μm, p = 0.0002) and two weeks (252.2 ± 55.1μm, p = 0.001). All membranes from the initial time showed foci of osteogenic differentiation that progressively reduced over time. Conclusion In addition to the structural and protective function of the membrane, its intrinsic biological characteristics can actively contribute to bone regeneration. The biological activity attributed by the presence of foci of osteogenesis confers to the membrane the potential of osteoinduction that favors the local conditions for the integration of the bone graft.
Resumo Objetivo Reproduzir em modelo animal a técnica cirúrgica de Masquelet utilizada no tratamento de defeitos ósseos críticos e analisar as características da membrana formada em torno do cimento ósseo. Métodos Um defeito crítico de 10mm foi realizado na diáfise femoral de 21 ratos Sprague-Dawley. Após a ressecção da porção central da diáfise o defeito foi estabilizado com fio de Kirschner introduzido pelo canal medular e com a interposição de espaçador de cimento ósseo. Após 2, 4, e 6 semanas do procedimento cirúrgico os animais foram eutanasiados e avaliados em radiografias do membro posterior quanto ao tamanho do defeito, o alinhamento e a estabilidade da osteossíntese. As membranas formadas em torno do espaçador foram submetidas a análise histológica para avaliação da espessura, da maturação do tecido conjuntivo e da densidade vascular. Resultados Ao longo do tempo as membranas inicialmente constituídas por tecido conjuntivo frouxo foram substituídas por membranas representadas por tecido conjuntivo denso, rico em fibras colágenas espessas. Com seis semanas a espessura das membranas foi maior (565 ± 208μm) do que com quatro (186,9 ± 70,21μm, p = 0,0002) e duas semanas (252,2 ± 55,1μm, p = 0,001). Todas as membranas do tempo inicial apresentaram focos de diferenciação osteogênica que reduziram progressivamente ao longo do tempo. Conclusão Além da função estrutural e protetora da membrana, suas características biológicas intrínsecas podem contribuir ativamente para a regeneração óssea. A atividade biológica atribuída pela presença de focos de osteogênese confere à membrana potencial de osteoindução que favorece as condições locais para a integração do enxerto ósseo.
Sujet(s)
Animaux , Régénération osseuse , Modèles animauxRÉSUMÉ
Abstract Objective Testing an experimental model for ischemic necrosis of the femoral head in Legg-Calvé-Perthes disease by evaluating gait, imaging and morphohistology. Methods The operation was done in 11 piglets. Necrosis by cerclage in the right femoral neck was induced. Piglets were divided into group A, with 8 animals, euthanizing two in the 2nd, 4th, 6th, and 8th weeks, respectively; and group B, with 2 animals (sham), submitted to the surgical procedure without cerclage of the right femoral neck. The gait classification used was that of Etterlin. The frozen femurs were submitted to digital radiography and computed tomography. The height and width of the epiphysis and epiphysary coefficient were measured at study times. Light microscopy and immunohistochemistry with TGF-β1 were performed. Results One animal died of sepsis in Group A. In this group, claudication was observed in all animals. On digital radiography and computed tomography, bone sclerosis, enlargement of the right femoral neck, flattening, collapse, and fragmentation of the right femoral head were observed. All epiphysis height and epiphysary coefficient values of the right femoral head were lower than the contralateral ones, in which were observed chondrocytes disordered and separated by gaps. A reduction in TGF-β1 expression was observed at 2 and 6 weeks in the right femoral head and at eight in the left. In group B, there were no signs of necrosis and gait was normal. Conclusions The model presented reproduced macroscopic necrosis on digital radiography, computed tomography, and microscopy. Gait evaluation showed a good correlation with other ischemia findings. Level of EvidenceV. Diagnostic studies.
Resumo Objetivo Testar um modelo experimental para necrose isquêmica da cabeça femoral na doença de Legg-Calvé-Perthes avaliando a marcha, exames de imagens e morfohistologia. Métodos Operaram-se 11 leitões. Induziu-se a necrose por cerclagem no colo femoral direito. Dividiram-se os leitões em grupo A com 8 animais, sacrificando-se dois na 2ª, 4ª, 6ª e 8ª semanas, respectivamente; e grupo B, com 2 animais (sham), submetidos ao procedimento cirúrgico sem a cerclagem do colo femoral direito. A classificação da marcha utilizada foi a de Etterlin. Os fêmures congelados foram submetidos à radiografia digital e tomografia computadorizada. Mediram-se a altura e largura da epífise e o coeficiente epifisário nos tempos de estudo. Realizou-se, microscopia de luz e imunohistoquímica com TGF-β1. Resultados Um animal morreu por sepse no grupo A. Neste grupo, observou-se claudicação em todos os animais. Na radiografia digital e tomografia computadorizada observaram-se: esclerose óssea, alargamento do colo femoral direito, achatamento, colapso e fragmentação da cabeça femoral direita. Todos os valores da altura da epífise e coeficiente epifisário da cabeça femoral direita foram menores que os contralaterais, nos quais observaram-se condrócitos desordenados e separados por lacunas. Observou-se redução da expressão do TGF-β1 com 2 e 6 semanas nas cabeças femorais direitas e nas esquerdas com oito. No grupo B, não ocorreram sinais de necrose e a marcha foi normal. Conclusões O modelo apresentado reproduziu a necrose macroscopicamente, na radiografia digital, tomografia computadorizada e microscopia. A avaliação da marcha demonstrou boa correlação com os demais achados de isquemia. Nível de EvidênciaV. Estudos diagnósticos.