Effect of Toxoplasma gondii on colon cancer growth in mouse model

2021 ◽  
Vol 9 (4) ◽  
pp. 168-176
Keyword(s):  
Colon Cancer ◽  
Immune System ◽  
Toxoplasma Gondii ◽  
Mouse Model ◽  
Tumor Growth ◽  
Cancer Immunotherapy ◽  
Target Therapy ◽  
Control Group ◽  
Neoplastic Cells ◽  
Tumor Environment

Despite all advances in cancer treatment methods, failure of treatment is a major concern. This failure can be caused by tumor environment made by tumor cells and prevents immune system to reach neoplastic cells. So, cancer immunotherapy and target therapy are in the focus of scientists. Due to the inverse relationship shown between parasites and cancer, parasites are a candidate for use in cancer immunotherapy. Toxoplasma gondii is an intracellular parasite invades many cells of vertebrae spices but make symptoms only in fetus and immuno-deficient person. Studies have shown T. gondii can stimulate immune system against neoplastic cells and break fort of tumor environment. In this experimental work, Colon cancer bearing mice randomly divided into three groups. Groups 1 and 2 were injected with either lysate or irradiated tachyzoite of T. gondii respectively. The third group were left intact as control group. Our resulted data showed that in irradiated tachyzoite or lysate treated groups there was a significant reduction in tumor growth in comparison with control group. However, the difference in survival time was not statistically significant. In conclusion, treatment with T. gondii antigens resulted in suppression of tumor growth. Keywords: Toxoplasma gondii; Cancer; Immunotherapy; Tumor; Mouse model

scholarly journals Effect of Toxoplasma gondii on colon cancer growth in mouse model

2021 ◽  
Vol 9 (2) ◽  
pp. 168-176
Author(s):  
Farideh Zavareh ◽  
◽  
Mahboubeh Hadiipour ◽  
Reza Kalantari ◽  
Somayeh Mousavi ◽  
...  
Keyword(s):  
Colon Cancer ◽  
Immune System ◽  
Toxoplasma Gondii ◽  
Tumor Growth ◽  
Cancer Immunotherapy ◽  
Target Therapy ◽  
Control Group ◽  
Neoplastic Cells ◽  
Tumor Environment ◽  
The Difference

Despite all advances in cancer treatment methods, failure of treatment is a major concern. This failure can be caused by tumor environment made by tumor cells and prevents immune system to reach neoplastic cells. So, cancer immunotherapy and target therapy are in the focus of scientists. Due to the inverse relationship shown between parasites and cancer, parasites are a candidate for use in cancer immunotherapy. Toxoplasma gondii is an intracellular parasite invades many cells of vertebrae spices but make symptoms only in fetus and immuno-deficient person. Studies have shown T. gondii can stimulate immune system against neoplastic cells and break fort of tumor environment. In this experimental work, Colon cancer bearing mice randomly divided into three groups. Groups 1 and 2 were injected with either lysate or irradiated tachyzoite of T. gondii respectively. The third group were left intact as control group. Our resulted data showed that in irradiated tachyzoite or lysate treated groups there was a significant reduction in tumor growth in comparison with control group. However, the difference in survival time was not statistically significant. In conclusion, treatment with T. gondii antigens resulted in suppression of tumor growth.

scholarly journals P06.07 In vivo studies of immunomodulatory a-CTLA-4 antibody in a humanized mouse model

2021 ◽  
Vol 9 (Suppl 1) ◽  
pp. A22.1-A22
Author(s):  
C Reitinger ◽  
F Nimmerjahn
Keyword(s):  
Immune System ◽  
Mouse Model ◽  
Cancer Immunotherapy ◽  
Model Systems ◽  
Checkpoint Control ◽  
Human Immune System ◽  
Humanized Mouse ◽  
Humanized Mouse Model ◽  
Human Immune

BackgroundRecent findings in cancer immunotherapy have reinforced the hypothesis that the immune system is able to control most cancers. Immunomodulatory antibodies can enhance immune responses, having the potential to generate anti-cancer immunity.1–4Materials and MethodsMost current studies addressing this question are performed in murine mouse model systems or use in vitro culture systems, which do not reflect the human in vivo situation, potentially leading to results that cannot be fully translated into human cancer therapy. Therefore, it is necessary to establish a new mouse model, which allows the study of cancer immunotherapy in the context of a human immune system. We focused on the establishment of a humanized mouse model, in which different immunomodulatory antibodies can be tested in the presence of a human immune system.ResultsFirst experiments concerning the suitability to test immunomodulatory antibodies in the humanized mouse model, revealed that effects of checkpoint-control antibody a-CTLA-4 were similar to the effects seen in patients of clinical studies. To analyse the anti-tumor activities of immunomodulatory antibodies in vivo we are establishing a human melanoma-like tumor model in humanized mice.ConclusionsThis enables us to test the efficacy of immunomodulatory agonistic antibodies (such as CP-870,893) and checkpoint control antibodies (such as anti-CTLA-4) in eliminating a melanoma-like tumor. Furthermore, parameters like tumor infiltrating human cells und cytokine/chemokine production can be analysed.ReferencesSchuster M, Nechansky A, Loibner H. Cancer immunotherapy. Biotechnol J 2006;1:138–147.Mellman I, Coukos G, Dranoff G. Cancer immunotherapy comes of age. Nature rev 2011;480:480–489.Finn OJ. Immuno-oncology: understanding the function and dysfunction of the immune system in cancer. Annals of Oncology 2012;23:vii6–vii9.Langer LF, Clay TM, Morse MA. Update on anti-CTLA-4 in clinical trials. Expert Opin Biol Ther 2007;8:1245–1256.Disclosure InformationC. Reitinger: None. F. Nimmerjahn: None.

scholarly journals Taurine Attenuates Carcinogenicity in Ulcerative Colitis-Colorectal Cancer Mouse Model

2020 ◽  
Vol 2020 ◽  
pp. 1-7 ◽  
Author(s):  
Guifeng Wang ◽  
Ning Ma ◽  
Feng He ◽  
Shosuke Kawanishi ◽  
Hatasu Kobayashi ◽  
...  
Keyword(s):  
Colon Cancer ◽  
Drinking Water ◽  
Mouse Model ◽  
Histopathological Examination ◽  
Tumor Formation ◽  
Water Model ◽  
Control Group ◽  
Ki 67

Taurine (2-aminoethane-sulfonic acid) is a type of amino acids and has numerous physiological and therapeutic functions, including anti-inflammation. However, there are few studies on the anticancer action of taurine. Our previous studies have demonstrated that taurine exhibits an apoptosis-inducing effect on human nasopharyngeal carcinoma cells in vitro. In this study, we have investigated whether taurine has an anticancer effect, using azoxymethane (AOM)/sulfate sodium (DSS)- induced mouse model for colon carcinogenesis. All mice, except those in control group, received a single intraperitoneal injection of AOM and DSS in the drinking water for 7 days twice, with 1-week interval. After the first DSS treatment, mice were given distilled water (model group) or taurine in the drinking water (taurine group) ad libitum. No tumor was observed in the control group. Taurine significantly suppressed AOM+DSS-induced tumor formation. Histopathological examination revealed AOM/DSS treatment induced colon cancer in all mice (8/8, 100%), and taurine significantly inhibited the progression of colon cancer (4/9, 44.4%). Taurine significantly attenuated cell proliferation in cancer tissues detected by Ki-67 staining. Taurine significantly increased the levels of an apoptosis marker cleaved caspase-9 and tumor suppressor protein PTEN. This is the first study that demonstrated that taurine significantly reduced carcinogenicity in vivo using AOM/DSS-induced colon cancer mouse model.

scholarly journals Emerging nanomedicines for effective breast cancer immunotherapy

2020 ◽  
Vol 18 (1) ◽  
Author(s):  
Amirhossein Bahreyni ◽  
Yasir Mohamud ◽  
Honglin Luo
Keyword(s):  
Breast Cancer ◽  
Immune System ◽  
Cancer Immunotherapy ◽  
Immune Cells ◽  
Tumor Antigens ◽  
Host Immune System ◽  
Primary Tumors ◽  
Novel Approach ◽  
Tumor Environment ◽  
Advanced Biomaterials

AbstractBreast cancer continues to be the most frequently diagnosed malignancy among women, putting their life in jeopardy. Cancer immunotherapy is a novel approach with the ability to boost the host immune system to recognize and eradicate cancer cells with high selectivity. As a promising treatment, immunotherapy can not only eliminate the primary tumors, but also be proven to be effective in impeding metastasis and recurrence. However, the clinical application of cancer immunotherapy has faced some limitations including generating weak immune responses due to inadequate delivery of immunostimulants to the immune cells as well as uncontrolled modulation of immune system, which can give rise to autoimmunity and nonspecific inflammation. Growing evidence has suggested that nanotechnology may meet the needs of current cancer immunotherapy. Advanced biomaterials such as nanoparticles afford a unique opportunity to maximize the efficiency of immunotherapy and significantly diminish their toxic side-effects. Here we discuss recent advancements that have been made in nanoparticle-involving breast cancer immunotherapy, varying from direct activation of immune systems through the delivery of tumor antigens and adjuvants to immune cells to altering immunosuppression of tumor environment and combination with other conventional therapies.

scholarly journals Simple and effective bacterial-based intratumoral cancer immunotherapy

2021 ◽  
Vol 9 (9) ◽  
pp. e002688
Author(s):  
Christina S E Carroll ◽  
Erin R Andrew ◽  
Laeeq Malik ◽  
Kathryn F Elliott ◽  
Moira Brennan ◽  
...  
Keyword(s):  
Immune System ◽  
Tumor Growth ◽  
Cancer Immunotherapy ◽  
Cancer Patients ◽  
Immune Cell ◽  
Human Cancer ◽  
Intratumoral Injection ◽  
Ct Scans ◽  
Antitumor Effects ◽  
Wide Range

BackgroundWe describe intratumoral injection of a slow-release emulsion of killed mycobacteria (complete Freund’s adjuvant (CFA)) in three preclinical species and in human cancer patients.MethodsEfficacy and safety were tested in mammary tumors in mice, in mastocytomas in mice and dogs, and in equine melanomas. In mice, survival, tumor growth, and tumor infiltration by six immune cell subsets (by flow cytometry) were investigated and analyzed using Cox proportional hazards, a random slopes model, and a full factorial model, respectively. Tumor growth and histology were investigated in dogs and horses, as well as survival and tumor immunohistochemistry in dogs. Tumor biopsies were taken from human cancer patients on day 5 (all patients) and day 28 (some patients) of treatment and analyzed by histology. CT scans are provided from one patient.ResultsSignificantly extended survival was observed in mouse P815 and 4T1 tumor models. Complete tumor regressions were observed in all three non-human species (6/186 (3%) of mouse mastocytomas; 3/14 (21%) of canine mastocytomas and 2/11 (18%) of equine melanomas). Evidence of systemic immune responses (regression of non-injected metastases) was also observed. Analysis of immune cells infiltrating mastocytoma tumors in mice showed that early neutrophil infiltration was predictive of treatment benefit. Analysis of the site of mastocytoma regression in dogs weeks or months after treatment demonstrated increased B and T cell infiltrates. Thus, activation of the innate immune system alone may be sufficient for regression of some injected tumors, followed by activation of the acquired immune system which can mediate regression of non-injected metastases. Finally, we report on the use of CFA in 12 human cancer patients. Treatment was well tolerated. CT scans showing tumor regression in a patient with late-stage renal cancer are provided.ConclusionOur data demonstrate that intratumoral injection of CFA has major antitumor effects in a proportion of treated animals and is safe for use in human cancer patients. Further trials in human cancer patients are therefore warranted. Our novel treatment provides a simple and inexpensive cancer immunotherapy, immediately applicable to a wide range of solid tumors, and is suitable to patients in developing countries and advanced care settings.

The effect of different doses of bevacizumab and irinotecan on tumor growth of nude mice bearing human colon cancer DLD-1.

2014 ◽  
Vol 32 (3_suppl) ◽  
pp. 518-518
Author(s):  
Luo Cong
Keyword(s):  
Colon Cancer ◽  
Tumor Growth ◽  
Nude Mice ◽  
Tumor Angiogenesis ◽  
Human Colon ◽  
Control Group ◽  
Human Colon Cancer ◽  
Group A ◽  
Group B ◽  
Different Doses

518 Background: Anti-angiogenic therapy is an important therapeutic strategy in advanced colorectal cancer. However, the anti-angiogenic drug,such as bevacizumab(avastin) is expensive. So, clarifying whether different doses of avastin play the same effect in vivo is urgently needed. The aim of the study was to observe the different doses of avastin in combination with irinotecan in human colon tumor growth in nude mice and tumor angiogenesis. Methods: 21 nude mice inoculated with DLD-1 human colon cancer cells were randomly divided into four groups: sterile saline control (group A), 5mg/kg avastin plus irinotecan chemotherapy group (group B), 10mg/kg avastin plus irinotecan group (group C), and irinotecan chemotherapy group (group D). Drugs were administered in the first 1,5,9 days, mice were sacrificed in the 10th day after treatment, the tumor growth inhibitory rate was calculated and the tumor microvessel density (MVD) were detected by immunohistochemistry. Results: The tumor inhibition rate in groups B, C, and D were 62.85%, 47.91%, 39.59% respectively. A, B, C, and D groups’ MVD were 7.000 ± 0.71, 4.940 ± 0.58, 5.080 ± 1.25, 5.557 ± 2.04, The MVD in group B and C were significant different compared with group A by Dunnett's test, and the MVD expression difference between D, A groups and B, C groups did not reach statistical significance (P values were 0.086,0.083). Tissue necrosis was found in each group after HE staining of tumor tissue. Among them, the control group, mostly mild to moderate necrosis, and the necrosis area were increased after drug treatment. But there were no statistical differences of the necrotic area in drug treated groups graded by rank sum test (χ2 = 4.73, P = 0.193). And cell apoptosis was obviously seen in treated groups. Conclusions: Different doses of avastin with irinotecan inhibited the tumor growth on DLD-1 xenografted nude mice, Synergistic effects were observed in combination therapy, From cell morphology changes after staining with HE, we speculated that the mechanism may be related to the inhibition of tumor angiogenesis, and cell apoptosis increasing. The effect of 5mg/kg and 10mg/kg bevacizumab on tumor volume and MVD had no significant differences.

Preclinical Immunogenicity Assessment of Baxter‘s Longer-Acting FVIII Candidate BAX 855 Using Novel Preclinical Models,

Blood ◽  
2011 ◽  
Vol 118 (21) ◽  
pp. 3323-3323
Author(s):  
Frank M Horling ◽  
Sandra Schwele ◽  
Christian Lubich ◽  
Rafi U Ahmad ◽  
Markus Weiller ◽  
...  
Keyword(s):  
Immune System ◽  
Mouse Model ◽  
Mouse Models ◽  
Mhc Class Ii ◽  
Immune Tolerance ◽  
Class Ii ◽  
Control Group ◽  
Potential Impact ◽  
Buffer Control

Abstract Abstract 3323 Baxter is developing a PEGylated recombinant human factor VIII conjugate (BAX 855) based on the modification of full-length FVIII with polyethylene glycol (PEG). The FVIII molecule is derived from a CHO cell line using a plasma-protein-free method. Any chemical modification of FVIII might alter its immunogenic potential. Therefore, careful preclinical immunogenicity studies of PEGylated FVIII in comparison to unmodified FVIII are important. We evaluated the immunogenicity of BAX 855 in comparison to ADVATE, Baxter‘s unmodified recombinant full-length FVIII concentrate. For this purpose, we used different in vitro and in vivo models to s assess the potential impact of BAX 855 and ADVATE on both the innate and the adaptive immune system. The assessment of the potential impact of BAX 855 and ADVATE on the human innate immune system was based on their potential to induce the release of pro- inflammatory cytokines (IL-1β, IL-6, IL-8 and TNF-α) in an in vitro human whole blood assay and on its potential to activate the human complement system in human plasma in vitro. The assessment of the potential impact of BAX 855 and ADVATE on the adaptive immune system was based on their potential to induce antibodies in 3 different hemophilic mouse models and in cynomolgous monkeys. The hemophilic moue models included a hemophilic mouse model with a knockout of the murine FVIII that express a human F8 cDNA as a transgene, a hemophilic mouse model that expresses the human MHC-class II protein HLA-DRB1*1501 on the background of a knockout of the murine MHC-class II complex and a conventional hemophilic mouse model with a knockout of the murine FVIII gene. Hemophilic mice that express a human F8 cDNA as a transgene are immunologically tolerant to human FVIII and develop antibodies against human FVIII only if the immune tolerance breaks down. Using this model, we asked if BAX 855 is able to maintain immune tolerance to human FVIII. The hemophilic mouse models that expresses the human MHC-class II protein HLA-DRB1*1501 mimics the situation in an important fraction of hemophilia A patients with FVIII inhibitors. The human MHC-class II haplotype HLA-DRB1*1501 was previously shown to be associated with an increased risk for patients to develop FVIII inhibitors. Using this model, we asked if BAX 855 expresses an immunogenicity profile similar to ADVATE. BAX 855 and ADAVTE induced similar low levels of cytokine release (IL-1β, IL-6, IL-8 and TNF-α) that were similar to the cytokine release observed in the buffer control group after incubation with human whole blood in vitro. In addition, BAX 855 and ADVATE induced similar low levels of complement activation that were not different from the buffer control group after incubation with human plasma in vitro. Importantly, BAX 855 and ADVATE induced similar levels and incidences of antibodies against FVIII and against PEG-FVIII in all mouse models. In addition, immune tolerance to FVIII was maintained in hemophilic mice expressing the human F8 cDNA. Finally, no major differences in antibody titers were seen after treatment of cynomolgus monkeys with BAX 855 and ADVATE. We conclude that results obtained in comparative immunogenicity studies in vitro and in vivo demonstrate that BAX 855 and ADVATE have a similar immunogenicity profile. Therefore, we expect that BAX 855 will express a similar safety profile as ADVATE in patients. Disclosures: Horling: Baxter Innovations GmbH: Employment. Schwele:Baxter Innovations GmbH: Employment. Lubich:Baxter BioScience: Employment. Ahmad:Baxter Innovations GmbH: Employment. Weiller:Baxter BioScience: Employment. Spatzenegger:Baxter Innovation GmbH: Employment. Schwarz:Baxter Innovations GmbH: Employment. Reipert:Baxter Innovations GmbH: Employment.

scholarly journals Radiotherapy combined with an engineered Salmonella typhimurium inhibits tumor growth in a mouse model of colon cancer

2016 ◽  
Vol 65 (4) ◽  
pp. 413-418 ◽  
Author(s):  
Xiande Liu ◽  
Shengnan Jiang ◽  
Linghua Piao ◽  
Feng Yuan
Keyword(s):  
Colon Cancer ◽  
Mouse Model ◽  
Tumor Growth ◽  
Salmonella Typhimurium

scholarly journals Dual CTLA-4 and PD-L1 Blockade Inhibits Tumor Growth and Liver Metastasis in a Highly Aggressive Orthotopic Mouse Model of Colon Cancer

Neoplasia ◽  
2019 ◽  
Vol 21 (9) ◽  
pp. 932-944 ◽  
Author(s):  
E Fiegle ◽  
D Doleschel ◽  
S Koletnik ◽  
A Rix ◽  
R Weiskirchen ◽  
...  
Keyword(s):  
Colon Cancer ◽  
Liver Metastasis ◽  
Mouse Model ◽  
Tumor Growth ◽  
Orthotopic Mouse Model

scholarly journals Inhibition of Colon Cancer in Mice by Microencapsulated Probiotic

2016 ◽  
Author(s):  
◽  
Frederick Oluwasheyi Odun-Ayo
Keyword(s):  
Colon Cancer ◽  
Mouse Model ◽  
Dietary Fibre ◽  
Drug Carrier ◽  
Control Group ◽  
Rrna Gene ◽  
High Morbidity ◽  
Citrus Pectin ◽  
Probiotic Treatment

Colon cancer is the third most common cancer worldwide with a high morbidity and mortality rate. Therapies are less effective during metastasis, therefore prevention and earlier detection is key to reducing the risk of colon cancer. Increased dietary fibre and probiotic intake is known to lower the risk of colon cancer. Probiotics are defined as “live microorganisms which when administered orally in an adequate amount confer a health benefit on the host”. The International Dairy Federation recommends a viable minimum level of 6–7 log10cfu/g in a probiotic product being consumed. Different biopolymer matrices have been used for encapsulation of probiotics; however, loss of viability is still a major challenge. Citrus pectin is a dietary fibre polysaccharide broken down into smaller fragments to form modified citrus pectin (MCP). The unique bioactivity of MCP against carcinogenesisis is linked to its sugar β-galactose inhibiting the cell signalling protein marker, galectin-3 (gal-3), which is intimately involved in endothelial cell morphogenesis. The vascular endothelial growth factor (VEGF) signalling, which invariably drives angiogenesis can be activated when gal-3 binds to integrins. The bioactivity and uptake of MCP may be improved through a novel approach if conjoined with a supplement for example probiotic. Therefore, the synergistic inhibitory effect of modified citrus pectin alginate (MCPA) probiotic microbeads on gal-3 and VEGF in an azoxymethane (AOM) induced colon carcinogenesis Balb/c mouse model was investigated. A microencapsulation process was used to produce a MCPA microbead containing probiotic, Lactobacillus acidophilus ATCC 4356. Efficiency of the microbead was evaluated in vitro (simulated conditions) and in vivo (Balb/c mouse model). Genomic identification of faecal lactobacilli samples from the treated mice was analyzed. Optimization of AOM dose-time with 10 and 15 mg/kg AOM intraperitoneal (ip) administered to Balb/c mice for 2 and 4 weeks were performed. The optimal AOM dose was initiated prior to intake of MCPA, AP (alginate calcium) probiotic microbeads and MCP in Balb/c mice for 16 weeks; samples were analyzed for colon histopathology and immunohistochemistry. The MCPA probiotic microbeads significantly enhanced the viability of L. acidophilus ATCC 4356 compared to the AP microbeads in vitro (p< 0.05). Exposure of the MCPA probiotic microbeads to 3 h of simulated gastric juice (SGJ) resulted in 82.7% survival of L. acidophilus ATCC 4356. Also, the faecal lactobacilli count in the MCPA probiotic treated mice significantly increased after 28 days by 10.2% compared to the AP probiotic, MCP treated and control mice (p< 0.0001). A total of 4DNA encoding 16S rRNA gene closest to the genera namely Lactobacillus, Bacillus, Enterococcus and Bifidobacterium were identified from faecal samples of the colon cancer-induced Balb/c mice. Azoxymethane at 15 mg/kg for 4 weeks induced optimal gal-3 and VEGF immunoexpression. Furthermore, MCPA probiotic treatment significantly reduced gal-3 immunoexpression in the colon of AOM induced cancer Balb/c mice compared to the control mice (p< 0.0001). The immunoexpresion of VEGF in the MCPA and AP probiotic treated groups was weakly positive and significantly reduced when compared to the control group (p<0.05), while the MCP treated group was barely positive (p< 0.001). Modified citrus pectin alginate is a novel effective means of oral delivery of bacterial cells and bioactive compounds. It has a good biodegradability, inexpensive, non-toxic, proven efficiency, and stability at low temperatures warranting its use as a drug carrier by pharmaceuticals. Modified citrus pectin alginate probiotic microbeads increase bioactivity and chemoprevention against colon pre-cancerous lesions and adenocarcinoma through inhibition of gal-3 and VEGF in the mouse model. Modified citrus pectin alginate can be used in probiotic therapy, which may improve the prevention of colon cancer.

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