• Title/Summary/Keyword: cytotoxicity assay

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Effects of soybean extracts fermented with Lactic acid bacteria on immune system activity (유산균을 이용한 대두 발효 추출물이 면역계 활성에 미치는 영향)

  • Park, Byung-Doo;Kim, Hye-Ja
    • Journal of Society of Preventive Korean Medicine
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    • v.16 no.3
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    • pp.139-153
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    • 2012
  • Objectives : NK cells are spontaneously cytotoxic lymphocytes. These are not only important parts in the first line of defence against bacterial and viral infections of outside, but they may also play a critical role in chronic viral diseases. NK cells kill their targets spontaneously, without the need for prior sensitization and class I MHC restriction by the regulation of cytolytic functions and secretion of a variety of cytokines, such as interleukin-12(IL-12), MCP-1, IL-6, TNF-α, IFN-γ. In addition, macrophage and NK cells cooperate through the production of cell mediates. These cooperation and modulation are one of major factors to prevent for evading immune surveillance of cancer. Hence, it could be assumed that if any candidate to enhance activities of macrophage and NK cell, it is considered as a potentially useful agents against cancer. Methods : In our study, to investigate effect of fermented soybean extracts by Lactic acid bacteria (SFE, soybean fermented extracts) work on intestinal immune cell to maintain general immune modulating and anti-cancer activity. We analyzed NK cytotoxicity assay and gene expressions of cytokine related with macrophage and NK cell activity. Results : In vitro experiment, SFE was verified as safety material for cell toxicicty to tumor cell strain without any toxicity of tumor growth inhibition and various cell strain. Effects of macrophage activity stimulating directly by SFE measured induced cytokine. The studies showed that IL-12 production by stimulation of SFE depended on concentration from 0.16mg/mL to 0.63mg/mL with non toxicity to cell, and it was the best activity at 0.63mg/mL. Besides, the effective concentration of SFE producing TNF-α is similar to IL-12, but it was the best activity at 1.25mg/mL. The level of MCP-1, IL-6 and IFN-γ depended on concentration from 0.16mg/mL to 10mg/mL, IFN-γ showed the best activity at the effective concentration of 0.63mg/mL. With the result of NK cell activity measurement, the spleen cell of mouse injected SFE had 1.5 times higher killing effect than non injected cell. Conclusions : The result of this studies is that Soybean fermetated extracts(SFE) has possibility to immune aided material for the function not only inhibition of microbial infection to macrophage but also activity of adaption immune and cellular immune system.

Dasatinib Inhibits Lyn and Fyn Src-Family Kinases in Mast Cells to Suppress Type I Hypersensitivity in Mice

  • Lee, Dajeong;Park, Young Hwan;Lee, Ji Eon;Kim, Hyuk Soon;Min, Keun Young;Jo, Min Geun;Kim, Hyung Sik;Choi, Wahn Soo;Kim, Young Mi
    • Biomolecules & Therapeutics
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    • v.28 no.5
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    • pp.456-464
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    • 2020
  • Mast cells (MCs) are systemically distributed and secrete several allergic mediators such as histamine and leukotrienes to cause type I hypersensitivity. Dasatinib is a type of anti-cancer agent and it has also been reported to inhibit human basophils. However, dasatinib has not been reported for its inhibitory effects on MCs or type I hypersensitivity in mice. In this study, we examined the inhibitory effect of dasatinib on MCs and MC-mediated allergic response in vitro and in vivo. In vitro, dasatinib inhibited the degranulation of MCs by antigen stimulation in a dose-dependent manner (IC50, ~34 nM for RBL-2H3 cells; ~52 nM for BMMCs) without any cytotoxicity. It also suppressed the secretion of inflammatory cytokines IL-4 and TNF-α by antigen stimulation. Furthermore, dasatinib inhibited MC-mediated passive cutaneous anaphylaxis (PCA) in mice (ED50, ~29 mg/kg). Notably, dasatinib significantly suppressed the degranulation of MCs in the ear tissue. As the mechanism of its effect, dasatinib inhibited the activation of Syk and Syk-mediated downstream signaling proteins, LAT, PLCγ1, and three typical MAP kinases (Erk1/2, JNK, and p38), which are essential for the activation of MCs. Interestingly, in vitro tyrosine kinase assay, dasatinib directly inhibited the activities of Lyn and Fyn, the upstream tyrosine kinases of Syk in MCs. Taken together, dasatinib suppresses MCs and PCA in vitro and in vivo through the inhibition of Lyn and Fyn Src-family kinases. Therefore, we suggest the possibility of repositioning the anti-cancer drug dasatinib as a treatment for various MC-mediated type I hypersensitive diseases.

Effects of Mitomycin C on Sister Chromatid Exchanges in Cultured Human Lympocytes (항암제 Mitomycin C가 배양임파구의 자매염색분체 교환에 미치는 영향)

  • Hwang, In-Dam;Ki, No-Suk;Lee, Jeong-Sang;Kim, Nam-Song;Mun, Tae-Il
    • Journal of Preventive Medicine and Public Health
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    • v.19 no.2 s.20
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    • pp.244-251
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    • 1986
  • Sister chromatid exchanges(SCEs) and cell cycle kinetics were proposed as a sensitive and quantitative assay for mutagenicity and cytotoxicity in short-term cultures of phytohema-gglutinin(PHA)-stimu1ated human 1ymphocytes. Therefore, this study was performed to investigate the relation between the cytotoxic effects and sister chromatid exchanges. The resultes are summarized as follows: 1) The frequency of SCEs per cell are 13.1±2.8 in the lower concentration of 6.25×109Mand75.8±8.2 in the highest concentration of 1.00±107M. Mitotic index is decreased in the higher concentration of mitomycin C. The result indicates that mitomycin C led to a dose dependent increase in SCE frequency, but decease in mitotic index. 2) Chromosomal analysis was performed on metaphase cells that have divided one, two, and three or more times for cell cycle kinetics by fluorescence-plus-Giemsa(FPG) technique. According to the increased concentration of mitomycin C, the proportion of metaphase cells in the first are profoundly increased but the cells of third division are greatly decreased. 3) The frequency of SCEs per chromosome by chromosomal group are decreased gradually from A group to G group. But relationships between specific chromosomal group and SCE frequency are not found.

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In Vitro Antibacterial Effect of the Combination of Galla rhois ethanol extracts and Sodium chlorate against Intramacrophage Brucella abortus

  • Cha, Chun-Nam;Hong, Il-Hwa;Yu, Eun-Ah;Park, Eun-Kee;Yoo, Chang-Yeol;Kim, Suk;Lee, Hu Jang
    • Journal of Food Hygiene and Safety
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    • v.29 no.1
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    • pp.67-72
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    • 2014
  • This study investigated the antibacterial effects of GR ethanol extracts (GRE), sodium chlorate (SC) and a combination of GRE and SC (GS) on Brucella abortus (B. abortus). The antibacterial activities of GRE, SC and GS towards B. abortus were evaluated by incubating B. abortus with GRE, SC and GS. Following treatment with GRE, SC and GS, B. abortus survival and intracellular proliferation in macrophages were monitored. In the cellular cytotoxicity assay, GRE, SC and GS are not cytotoxic at concentrations less than 400μg/ml, 15 mM and 0.6GS (1 of GS, GRE 1,000μg/ml + SC 30 mM), respectively. The viability of B. abortus was markedly decreased in a dose-dependent manner in all treatment groups. In addition, B. abortus intracellular proliferation within macrophages was significantly reduced in cells treated with GRE (400μg/mL), SC (15 mM) and 0.5GS (GRE 500μg/mL + SC 15 mM) after 48 hr-incubation (GRE, p < 0.01; SC and 0.5GS, p < 0.001). Especially, in the treatment of GS, the synergistic effect of GRE and SC treatment on B. abortus in macrophage was observed. In conclusion, GS is useful as an antibacterial candidate against B. abortus, and can be applied in the field of meat and milk hygiene.

Effects of Antioxidative stress, Antimutagenicity and Cytotoxicity of Cancer cells in Fractional Extracts from Ganoderma lucidum Karst (영지버섯(Ganoderma lucidum Krast)의 순차 분획물의 산화적 스트레스 억제효과와 항돌연변이 및 암세포 증식 억제 효과)

  • Oh Se-In;Lee Mee-Sook
    • Korean journal of food and cookery science
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    • v.21 no.6 s.90
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    • pp.759-768
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    • 2005
  • This study was performed to determine the antioxidative effect of the hexane, dichloromethane, ethylacetate, butanol and water fractions of Ganoderma lucidum extracts on the inhibition of malondialdehyde(MDA) and bovine serum albumin(BSA) conjugation reaction, the inhibition of lipid peroxidation and the scavenging effect on 1,1-diphenyl-2-picryl-hydrazyl(DPPH) radical, the antimutagenic capacity as measured by the Ames test and the inhibitory effect on cancer cell. Ganoderma lucidum is believed to have possible antioxidative capacities, although the results have varied according to the assay method. The most effective antioxidative capacity was inhibition of lipid peroxidation. Among the five fractions, water fraction showed strong inhibition rates on MDA & BSA conjugation reaction, and ethylacetate fractions showed the most effective inhibition rate on lipid peroxidation and scavenging effect on DPPH radical. The indirect and direct antimutagenic effects of ethanol extracts of Ganoderma lucidum were examined by Ames test using Salmonella typhimurium TA98 and TA100. Among the samples, the water fraction did not have any antimutagenic effect. The inhibition rates on mutagenicity in the presence of 2.5 mg/plate were nearly 100% for Salmonella typhimurium TA98 and TA100 except the hexane fraction of the direct mutagenicity mediated by 2-Nitrofluorene in Salmonella typimurium TA98(64.69%). Under the 2.5 mg/plate concentration, the inhibitory effects of hexane and dichloromethane fraction were superior to that of the other fractions on the direct mutagenicity for Salmonella typhimurium TA100 and indirect mutagenicity for Salmonella typhimurium TA98 and TA100. The inhibitory effect of Ganoderma lucidum extracts on cell proliferation in HeLa and MCF-7 was investigated by U test. The dichloromethane fraction showed highly antiproliferative effect in HeLa and MCF-7(IC50: 0.122 mg/mL, 0.272 mg/mL, respectively) cells while the water faction had a weak inhibitory effect(IC50: 0.691 mg/mL, 10.919 mg/mL respectively). These results suggest that Ganoderma lucidum may have antioxidative, antimutagenic and anticancer capacities and may be a candidate of the prevention and dietetic treatment of chronic diseases and the development of antioxidative, antimutagenic and anticancer functional food.

Anti-oxidant and Anti-inflammatory activities of Zanthoxylum schinifolium Essential Oil (산초 종자 정유의 항산화 및 항염 효능)

  • Kim, Bo-Ae
    • Journal of the Korean Applied Science and Technology
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    • v.31 no.3
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    • pp.440-445
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    • 2014
  • The purpose of this study was to investigate anti-inflammatory and antioxidant effects of essential oil from seed of Zanthoxylum schinifolium on cultured RAW 264.7 cell line. Antioxidant activity of essential oil was evaluated by two different assays as 2,2-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging and super oxide dismutase (SOD) like activities. This essential oil was tested for cell viability on RAW 264.7 cell line by 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl-tetrazolium bromide (MTT) assay. The effects of anti-inflammatory on LPS-induced RAW 264.7 cell line was studied by the content of nitric oxide (NO) and prostagladin E2 (PGE2) in cells. The essential oil of seed from Zanthoxylum schinifolium obtained dose-dependently increased the scavenging activity on DPPH radical scavenging activity and SOD like activity. The essential oil showed low cytotoxicity as more than 98% cell viability in 40μg/mL1 concentration. The essential oil of seed extracted from Zanthoxylum schinifolium presented obvious effect on inflammation. These results suggest that essential oil of seed from Zanthoxylum schinifolium may have value as the potential anti-inflammatory effects by decreasing the action of NO and PGE2 and preventing the activation of oxidative.

Antimetastatic Effects of Crude Polysaccharide Isolated from Polygonati Rhizoma on 4T1 Breast Cancer Cells by Activation of Innate Immune System (황정(黃精)으로부터 유래한 조다당류의 선천면역 활성에 의한 유방암 세포주 전이 억제 효과)

  • Ji, Hae-Ri;Hwang, Deok-Sang;Lee, Chang-Hoon;Jang, Jun-Bok;Lee, Jin-Moo
    • The Journal of Korean Obstetrics and Gynecology
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    • v.32 no.4
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    • pp.1-13
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    • 2019
  • Objective: This study is aimed to investigate the anti-tumor metastasis by innate immunomodulating effects of crude polysaccharide isolated from Polygonati Rhizoma (CP-PR) on 4T1 breast cancer cells. Methods: CP-PR was isolated from Polygonati Rhizoma. Antimetastatic experiments were conducted in vivo mouse model by using 4T1 breast cancer cells. The cell viability of CP-PR was tested with normal spleen and 4T1 breast cancer cells. To observe the activation of macrophages with/without 4T1 breast cancer cells, production of tumor necrosis factor-α (TNFα), interleukin-6 (IL-6), IL-10 and IL-12 were measured with enzyme-linked immunosorbent assay (ELISA), respectively. In addition, the lysis of YAC-1 cells and the production of granzymes were measured to observe the activation of natural killer (NK) cell. Results: Intravenous administration of CP-PR significantly inhibited metastasis of 4T1 breast cancer cells. In an in vitro cytotoxicity analysis, CP-PR affected the growth of normal spleen and 4T1 breast cancer cells above specific concentration. The production of TNFα, IL-6, IL-10 and IL-12 were significantly increased in macrophages with CP-PR. As compared with control, CP-PR showed significantly higher production of TNFα, IL-10 and IL-12 in macrophages co-cultured with 4T1 breast cancer cells. The lysis of YAC-1 cells and the production of granzymes were significantly up regulated by CP-PR. Conclusion: CP-PR appears to have considerable activity on the anti-metastasis by activation of innate immune system.

Effect of Drug Eluting Uniformity for Biodegradable Stent by Solid Freeform Fabrication (쾌속조형기법을 이용한 생분해성 스텐트용 메쉬필름의 약물방출거동 효과)

  • Cheong, Sin Young;Kim, Yang Eun;Koh, Young Joo;Shin, Wang Soo;Lee, Jun Hee;Kim, Wan Doo;Yoo, Young Eun;Park, Su A
    • Polymer(Korea)
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    • v.38 no.1
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    • pp.93-97
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    • 2014
  • Biodegradable drug-eluting stent has dual functions of supporting the lumen and treating internal tumor preventing the restenosis by releasing drug. In this study, the polycaprolactone (PCL) based three dimensional (3D) mesh loaded with paclitaxel (PTX) was presented by rapid prototyping (RP) technique of solid freeform fabrication (SFF) for biodegradable drug-eluting stent application. PCL has many advantageous properties such as good biocompatibility, good mechanical properties, and good drug permeability. PTX is widely used in the cancer treatment by inhibiting tumor cell proliferation. Analytical methods of HPLC and NMR were used for simultaneous quantification of PTX. Scanning electron microscopy (SEM) was performed to observe the architecture and morphologies of 3D mesh. The cytotoxicity assay results indicated released PTX's biological activity. This study provided that PCL based 3D mesh loaded with PTX by RP technique has great potential for biodegradable drug-eluting stent application.

Preparation of Sulfobetaine Chitosan, Silk Blended Films, and Their Properties (설포베타인 키토산의 실크 블렌드 필름의 제조 및 그들의 성질)

  • Koo, Ja-Sung;Cha, Jae-Ryung;Oh, Se-Heang;Gong, Myoung-Seon
    • Polymer(Korea)
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    • v.38 no.1
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    • pp.54-61
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    • 2014
  • Water-soluble sulfobetaine chitosan (SCs) was prepared for a blending film with Bombyx mori silk fibroin (SF) by reacting chitosan with 1,3-propanesultone. A series of SF/SCs blended films were successfully prepared by mixing aqueous solutions of B. mori SF and SCs. The SF/SCs blended films were examined through spectroscopic and thermal analysis to determine the morphological changes of SF in the SCs. The effects of the SF/SCs blend ratios on physical and mechanical properties were investigated to discover the feasibility of using these films as biomedical materials such as artificial skin and wound dressing. X-ray analysis showed good compatibility between the two biopolymers. The in vitro degradation behavior of the SF/SCs blended films was systematically investigated for up to 8 weeks in phosphate buffered saline solution at 37C and showed a mass loss of 46.4% after 8 weeks. All films showed no cytotoxicity by MC3T3-E1 assay. After 3 days of culture, the relative cell number on all the SF/SCs films was slightly lower than that of an optimized tissue culture plastic.

Concentration-dependent in vitro Anti-osteoarthritis Effects of Mixed Formula - Pomegranate Concentrate Powder: Eucommiae Cortex: Achyranthis Radix 5:4:1 (g/g) on the Primary Cultured Rat Articular Chondrocytes

  • Choi, Beom Rak;Ku, Sae Kwang;Kang, Su Jin;Park, Hye Rim;Sung, Mi Sun;Lee, Young Joon;Park, Ki Moon
    • Journal of Physiology & Pathology in Korean Medicine
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    • v.33 no.2
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    • pp.131-140
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    • 2019
  • The objective of present study is to evaluate concentration-dependent in vitro anti-osteoarthritic (OA) effects of synergic mixed formula consisted of dried pomegranate juice concentrate powder, Eucommiae Cortex aqueous extract and Achyranthis Radix aqueous extract 5:4:1 (g/g) mixture on the primary cultured rat articular chondrocytes. First, any cytotoxic effect of mixture was observed using MTT (3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl-tetrazolium Bromide) assay. Next, cyto-protective effect of test substances was evaluated by using the recombinant human interleukin (rhIL)1α induced chondrocytes. In addition, anti-inflammatory effects were also observed on the lipopolysaccaride (LPS) treated chondrocytes through prostaglandin E2(PGE2) productions and 5-lipoxygenase (LPO) activities, and inhibitory effects on matrix metalloproteinase (MMP)-2 and MMP-9 activities were observed on rhIL1α treated chondrocytes with their extracellular matrix (ECM) related mRNA expressions. No obvious cytotoxic effects of mixture were demonstrated. Inflammatory damages of chondrocytes and related ECM degradations induced by treatment of LPS or rhIL1α were significantly and concentration-dependently inhibited by pretreatment of mixture from a concentration level of 0.001 mg/ml to 1 mg/ml. In addition, mixture showed IC50 for rhIL1αinduced MMP-2 and MMP-9 activities as 44.01 and 162.47μg/ml, and also showed EC50 for rhIL1αinduced inhibition of collagen type II, SOX9 and aggrecan mRNA expression as 8.61, 10.79 and 4.47μg/ml, respectively. It is observed that mixture showed concentration-dependent anti-inflammatory and cytoprotective ECM preserved effects on the primary cultured rat articular chondrocytes without cytotoxicity.