• IMMUNE NETWORK
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• 제7권4호
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• pp.197-202
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• 2007

Background: Immunomodulators enhancing MHC-restricted antigen presentation would affect many cellular immune reactions mediated by T cells or T cell products. However, modulation of MHC-restricted antigen presentation has received little attention as a target for therapeutic immunoregulation. Here, we report that lectins isolated from mushroom Fomitella fraxinea enhance MHC-restricted exogenous antigen presentation in professional antigen presenting cells (APCs). Methods: Lectins, termed FFrL, were isolated from the carpophores of Fomitella fraxinea, and its effects on the class I and class II MHC-restricted presentation of exogenous ovalbumin (OVA) were examined in mouse dendritic cells (DCs) and mouse peritoneal macrophages. The effects of FFrL on the expression of total MHC molecules and the phagocytic activity were also examined in mouse DCs. Results: DCs cultured in the presence of FFrL overnight exhibited enhanced capacity in presenting exogenous OVA in association with class I and class II MHC molecules. FFrL increased slightly the total expression levels of both class I (H-$2K^b$) and class II (I-$A^b$) MHC molecules and the phagocytic activity of DCs. Antigen presentation-enhancing activity of FFrL was also observed in macrophages isolated from mouse peritoneum. Conclusion: Lectins isolated from the carpophores of Fomitella fraxinea increase MHC-restricted exogenous antigen presentation by enhancing intracellular processing events of phagocytosed antigens.

• Fisheries and Aquatic Sciences
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• 제9권1호
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• pp.14-21
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• 2006

The aim of this study was to investigate in vivo toxicity and effects of two phthalate esters (PEs), di-n-butylphthalate (DBP) and di-2-ethylhexyl phthalate (DEHP), on the immune system of the bagrid catfish, Pseudobagrus fulvidraco. Groups of experimental fish were subjected to daily intraperitoneal injections of 300 or 1000 mg $kg^{-1}$ of DBP or DEHP for 3 days, and the cellularity and functional activity of phagocytes were measured in the spleen and pronephros (head kidney). The number of spleen leukocyte cells increased significantly (p<0.05) in response to low and high doses of DEHP and DBP, respectively; however, the cellularity of the pronephros was more susceptible to higher dose of DEHP than DBP. Nonspecific immunity, as determined by the phagocytic index (PI) and phagocytic capacity (PC), was significantly depressed by DEHP at 1000 $1000mg\;kg^{-1}\;day^{-1}$ in the pronephros at 3 days after injection. Furthermore, significantly (p<0.05) increased levels of serum glutamic oxaloacetate transaminase (GOT) and glutamic pyruvate transaminase (GPT) indicated marked hepatic dysfunction in immunosuppressed fish. Treated fish showed a significant reduction in total serum protein but no significant alteration in lysozyme activity. These results demonstrate the sensitivity of the fish immune response for predicting PE-induced immunotoxicity.

• Journal of Microbiology and Biotechnology
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• 제30권9호
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• pp.1395-1403
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• 2020

There is an increasing interest in using inactivated probiotics to modulate the host immune system and protect against pathogens. As the immunomodulatory function of heat-killed Lactobacillus brevis KCTC 12777BP (LBB) and its mechanism is unclear, we investigated the effect of LBB on immune response based on the hypothesis that LBB might exert stimulatory effects on immunity. In the current study, we demonstrate that administration of LBB can exert immune-stimulatory effects and promote clearance of foreign matters through enhancing phagocytosis. Treatment with LBB induced the production of TNF-α, IL-6, and nitric oxide in macrophages. Importantly, LBB directly increased the phagocytic activity of macrophages against bacterial particles. LBB was able to promote the production of TNF-α in bone marrow-derived macrophages and splenocytes and also increase the proliferation rate of splenocytes, suggesting that the immune-stimulating activity of LBB can be observed in primary immune cells. Investigation into the molecular mechanism responsible revealed that LBB upregulates TAK1 activity and its downstream ERK, p38, and JNK signaling pathways. To further confirm the immunomodulatory capability of LBB in vivo, we orally administered LBB to mice and assessed the effect on primary splenocytes. Splenocytes isolated from LBB-treated mice exhibited higher TNF-α expression and proliferative capacity. These results show that heat-killed L. brevis, a wildly consumed probiotic, may provide protection against pathogens through enhancing host immunity.

• Journal of Preventive Medicine and Public Health
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• 제30권3호
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• pp.555-566
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• 1997

This study was carried out to evaluate the cytotoxicity of rock wool fibers(RWFs) such as cell division disturbance, chromosomal and DNA damage, and mutagenicity using cultured cells. RWFs were the man made mineral fibers. In order to find the correlation between the cytotoxicity of RWFs and the phagocytic capacity of cells, the phagocytic processes were observed using scanning electron microscope. Cell division disturbance by RWFs was evaluated by the formation of multinucleated giant cells. The chromosomal damage was evaluated by the micronucleus formation. For the evaluation of oxidative DNA damage, 8-hydroxy-2'-deoxyguanosine (8-OH-dG) formation was measured utilizing calf thymus DNA. Mutagenicity was determined by the point mutation of HGPRT and the effect of RWFs on cell transformation was also observed. 1. Compared with the results of chrysotile, RWFs were no or little effect on the cell growth according to the results done by the tests of cell proliferation inhibition and relative plating efficiency. 2. The frequency of multinucleated giant cell formation was increased by the treatment of RWFs and it was dose-dependent. However, the effect of RWFs was weaker than that of chrysotile. 3. The number of micronuclei formed in the RWFs treated cells was between those of cells treated with chrysotile and those of untreated cells. 4. The 2 fold increase in the formation of 8-OH-dG in calf thymus DNA was observed in the cells treated with RWFs in the presence of $H_2O_2$. On the other hand, chrysotile had no effect on the 8-OH-dG formation. 5. RWFs had no effect on the HGPRT point mutation and cell transformation. These results showed that RWFs could induce chromosomal damage, cell division disturbance and oxidative DNA damage in the RWFs treated cells.

• 한국임상수의학회:학술대회논문집
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• 한국임상수의학회 2006년도 추계학술대회 및 정기총회
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• pp.65-65
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• 2006

• 생명과학회지
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• 제33권5호
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• pp.397-405
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• 2023

항산화제로서 산화적 손상의 방지에 중요한 역할을 하는 것으로 알려진 glutathione (GSH)의 면역 조절에 대한 연구는 현재까지 제대로 이루어지지 않았다. 본 연구에서 우리는 환원형 GSH인 luthione^®이 RAW 264.7 세포에서 면역 강화 효과가 있는지를 조사하였다. 유세포 분석 및 면역 형광 실험의 결과에 의하면, luthione은 대조군 세포에 비해 대식세포의 대표적인 기능인 식세포 활성을 luthione 처리 농도 의적으로 증가시키는 것으로 나타났다. 또한, cytokine array의 결과에 의하면, IL-5, IL-1β와 IL-27의 발현이 luthione이 처리된 세포에서 유의하게 증가하였다. 아울러 luthione에 의한 TNF-α 및 IL-1β의 생성 증가는 그들의 단백질 발현 증가를 통해 이루어졌으며, NO 및 PGE₂와 같은 면역 매개체 유리의 증가는 iNOS 및 COX-2의 발현 증가와 관련이 있었으며, 이는 M1 대식세포 분화 마커인 CD86 발현의 증가와 연관성이 있었다. 그리고 heatmap 분석을 통하여 SOCS1/3 매개 STAT/JAK 신호 전달 경로가 luthione에 의한 면역 조절 증가에 관여함을 확인하였다. 결론적으로, 우리의 결과는 luthione이 M1 macrophage polarization의 분자 조절자로 작용하여 면역 능력을 향상시킬 수 있음을 시사한다.

• Preventive Nutrition and Food Science
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• 제10권4호
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• pp.344-348
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• 2005

Fucoidans, high-molecular-weight sulfated polysaccharides extracted from brown seaweeds, have various biological activities. Here we examined whether fucoidan could ncrease the immunomodulation and proliferation capacity of cells in vitro. When peritoneal macrophages were treated with various concentrations of fucoidan $(1\~100{\mu}g/mL)$ for 24 hours, NO production was significantly increased. In addition, exposure of macrophages to $10{\mu}g/mL$ of fucoidan induced a phagocytic activity. Treatment of neuroblastoma cells (SK-N-SH) with fucoidan enhanced cell proliferation and NO production in a concentration-dependent manner. These results indicate that fucoidan has both immunomodulatory and cell proliferative properties, and may thus be a candidate for development as an immunomodulating agent.

• 대한의생명과학회지
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• 제9권2호
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• pp.85-91
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• 2003

Gentiana scabra var. buergeri (G. scabra) is a herb known to have therapeutic effect in infection diseases. We studied cellular activation and antitoxoplasmosis in macrophages after G. scabra stimulation. Macrophage activation was detected by nitrite production. Macrophages were treated with G. scabra extracted with water or methanol. Maximal nitrite production was detected in macrophages after stimulation of G. scabra extract 0.1 mg/ml. Maximal nitrite concentration was 23.22 0.003 uM/L in macrophages after water extract of G. scabra and was 24.07 1.41 uM/L after methanol extract of G. scabra. Effect of G. scabra in the phagocytic capacity of macrophages was monitored by using PI (percentage of macrophage infected by T gondii) method. The minimum PI (42.5 2.31) was detected in macrophages treated by water extract of G. scabra 0.1 mg/ml before infection of T gondii. We also examined toxoplasmastatic capacity of macrophage using FI (fold increase) method. The minimum FI (4.46 1.16) was shown in macrophages after water extract of G. scabra 0.1 mg/ml pretreatment before infection. Under electron microscope, proliferation of T gondii was inhibited by extract of G. scabra treatment in macrophages and the mitochondrion and lysosomal vacuoles within cells were increased. Taken together, G. scabra extract activates macrophages and induces toxopalsmastatic activity after T gondii infection. It is suggested that G. scabra may be used as a therapeutic drug against toxoplasmosis.

• 한국어병학회지
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• 제12권1호
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• pp.16-23
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• 1999

Levamisloe(LMS)이 뱀장어의 면역반응에 미치는 영향을 측정하기 위해서 뱀장어의 혈액 및 신장으로부터 백혈구를 분리하여, 림프구의 증식능, MIF 생산능, 자연살해세포활성능, 탐식세포의 탐식능, superoxide anion, hydrogen peroxide 및 lysozyme 활성능 등을 측정하였다. LMS는 T-cell 마이토젠인 Con A 및 PHA 처리시에는 LMS 농도에 비례감소를 보인 반면에 B-cell 마이토젠인 LPS에는 LMS 처리와는 무관하게 큰 차이를 보이지 않았다. 한편 MIF 및 MAF의 생성에는 LMS 처리 농도에 비례 증가되었다. NK 세포의 활성은 LMS 첨가농도에 비례 증가하였는데, 이는 표적세포에 대한 결합율을 증가시킨 결과 NK 세포의 활성이 증가된 것으로 보인다. LMS는 백혈구의 탐식능, superoxide anion의 생성능, hydrogen peroxide 생성능 및 Iysozyme의 활성을 증가시켰다. 이러한 결과로부터 LMS가 어체의 면역작용에 관여하는 작용기전은 면역 작동세포수의 증가를 촉진시키기보다는 분화를 촉진시켜서 cytokine의 방출증가 및 세포의 기능활성을 증강시킴을 알수 있다.

• 한국식품영양과학회지
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• 제33권3호
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• pp.469-474
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• 2004

본 연구에 사용한 아라비녹실란화합물은 미강에서 추출한 헤미셀룰로즈에 표고버섯균사체 배양물에서 분리한 효소를 작용시켜 생성된 식물성다당류이며, PSP(polysaccharide peptide)는 담자균류의 일종인 Coliolus versicocor Sov-1의 균사체에서 추출 정제하여 얻은 단백다당체 성분이다. 이들에 대한 면역세포 활성화 효과, 항암 효과 및 알레르기 억제효과 등에 관한 실험 결과는 다음과 같다. 비장세포의 B cell과 T cell에 arabinoxylane과 PSP의 항체생성과 세포활성능을 조사한 결과 PFC형 성은 10 ∼ 15%, RFC검출은 10 ∼ 30% 증가하였다 복강침출세포로부터 대식세포의 탐식능 효과는 대조군에 비하여 PSP는 약 18%, arabinoxylane은 22% 정도 증가하였다. S-180 고형암에 의한 항암실험에서 arabinoxylane은 66.2%(p<0.01), PSP는 49.0%(p<0.05)의 억제 효과를 확인할 수 있었다. 복수암에 의한 수명 연장효과는 PSP, arabinoxylane이 대조군에 비해 다소의 수명연장효과가 나타났으며, PSP가 아라비녹실란에 비해 약간의 높은 수명연장효과가 나타났다. 항알레르기 효과를 보기 위한 PCA 역가를 측정한 결과는 대조군이 80인데 비해 PSP군은 40, arabinoxylane군은 20으로 대조군에 비하여 다소 경감되었으며, arabinoxylane군이 다소 우수한 결과를 보였다. 혈중 histamine 함량도 PCA와 유사한 결과로 arabinoxylane군과 PSP군이 히스타민 함량을 다소 감소시키는 경향을 보였다.