• 제목/요약/키워드: Yu Il-Sun

검색결과 295건 처리시간 0.028초

Alteration of Cytokine Production during Visceral Larva Migrans by Toxascaris leonina in Mice

  • Kang, Shin Ae;Park, Mi-Kyung;Cho, Min Kyoung;Yu, Hak Sun
    • Parasites, Hosts and Diseases
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    • 제51권5호
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    • pp.583-588
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    • 2013
  • To determine alteration of immune responses during visceral larva migrans (VLM) caused by Toxascaris leonina at several time points, we experimentally infected mice with embryonated eggs of T. leonina and measured T-helper (Th) cell-related serial cytokine production after infection. At day 5 post infection (PI), most larvae were detected from the lungs, spleen, intestine, and muscle. Expression of thymic stromal lymphopoietin (TSLP) and CCL11 (eotaxin) showed a significant increase in most infected organs, except the intestine. However, expression of the CXCL1 (Gro-${\alpha}$) gene was most highly enhanced in the intestine at day 14 PI. Th1-related cytokine secretion of splenocytes showed increases at day 28 PI, and the level showed a decrease at day 42 PI. Th2-related cytokine secretion of splenocytes also showed an increase after infection; in particular, IL-5 level showed a significant increase at day 14 PI, and the level showed a decrease at day 28 PI. However, levels of Th17-related cytokines, IL-6 and IL-17A, showed gradual increases until day 42 PI. In conclusion, Th1, Th2, and Th17-related cytokine production might be important in immune responses against T. leonina VLM in experimental mice.

Interleukin-10 이 $interleukin-1{\beta}$로 유도되는 골흡수에 미치는 효과 (EFFECT OF INTERLEUKIM-10 ON THE BONE RESORPTION INDUCED BY INTERLEUKIN-1B)

  • 유윤정;강윤선;이승일
    • Journal of Periodontal and Implant Science
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    • 제24권2호
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    • pp.321-339
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    • 1994
  • The cytokines released by osteoblasts induce bone resorption via the differentiation of osteoclast precursors. In this process, $interleukin-1{\beta}$($IL-1{\beta}$)-induced bone resorption is mediated by granulocyte macrophage-colony stimulation factor(GM-CSF), interleukin-6 (IL-6), and tumor necrosis factor ${\alpha}$($TNF-{\alpha}$) released from osteoblasts. Since these cytokines (GM-CSF, IL-6, $TNF-{\alpha}$) are produced by not only osteoblasts but also monocytes, and interleukin-10(I1-10) inhibits the secretion of these cytokines from monocytes, it may be speculated that IL 10 could modulate the production of GM-CSF, IL-6, and $TNF-{\alpha}$ by osteoblasts, then control $IL-1{\beta}-induced$ bone resorption. Therefore, the aims of the present study were to examine the effects of IL-10 on bone resorption. The sixten or seventeen-day pregnant ICR mice were injected with $^{45}Ca$ and sacrificed one day after injection. Then fetal mouse calvaria prelabeled with $^{45}Ca$ were dissected out. In order to confirm the degree of bone resorption, mouse calvaria were treated with Lipopolysaccharide(LPS), $TNF-{\alpha}$, $IL-1{\alpha}$, IL-8, $IL-1{\beta}$, and $IL-1{\alpha}$, Then, IL-10 and $interferon-{\gamma}$ ($IFN-{\gamma}$) were added to calvarial medium, in an attempt to evaluate the effect of $IL-1{\beta}-induced$ bone resorption. In addition, osteoclasts formation in bone marrow cell cultures, and the concentration of IL-6, $TNF-{\alpha}$, and GM-CSF produced from mouse calvarial cells were investigated in response to $IL-1{\beta}$ alone and simultaneously adding f $IL-1{\beta}$ and IL-10. The degree of bone resorption was expressed as the ratio of $^{45}Ca$ release(the treated/the control). The osteoclasts in bone marrow cultures were indentified by tartrate resistant acid phosphatase(TRAP) stain and the concentration of the cytokines was quantified using enzyme linked immunosorbent method. As results of these studies, bone resorption was induced by LPS(1 ng/ml ; the ratio of $^{45}Ca$ release, $1.14{\pm}0.07$). Also $IL-1{\beta}$(1 ng/ml), $IL-1{\alpha}$(1 ng/ml), and $TNF-{\alpha}$(1 ng/ml) resulted in bone resorption(the rations of $^{45}Ca$ release, $1.61{\pm}0.26$, $1.77{\pm}0.03$, $1.20{\pm}0.15$ respectively), but IL-8 did not(the ratio of $^{45}Ca$ release, $0.93{\pm}0.21$). The ratios of $^{45}Ca$ release in response to IL-10(400 ng/ml) and $IFN-{\gamma}$(100 ng/ml) were $1.24{\pm}0.12$ and $1.08{\pm}0.04$ respectively, hence these cytokines inhibited $IL-1{\beta}$(1 ng/ml)-induced bone resorption(the ratio of $^{45}Ca$ release $1.65{\pm}0.24$). While $IL-1{\beta}$(1 ng/ml) increased the number of TRAP positive multinulcleated cells in bone marrow cultures($20{\pm}11$), simultaneously adding $IL-1{\beta}$(1 ng/ml) and IL-10(400 ng/ml) decreased the number of these cells($2{\pm}2$). Nevertheless, IL-10(400 ng/ml) did not affect the IL-6, GM-CSF, and $TNF-{\alpha}$ secretion from $IL-1{\beta}$(1 ng/ml)-activated mouse calvarial cells. From the above results, it may be suggested that IL-10 inhibites $IL-1{\beta}-induced$ osteoclast differntiation and bone resorption. However, the inhibitory effect of IL-10 on the osteoclast formation seems to be mediated not by the reduction of IL-6, GM-CSF, and $TNF-{\alpha}$ production, but by other mechanisms.

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Aspergillus 단백분해효소 알러젠에 의해 유도된 Th2 관련 기도염증반응에서 protease activated receptor 2 (PAR2)의 역할 (Role of Protease Activated Receptor 2 (PAR2) in Aspergillus Protease Allergen Induces Th2 Related Airway Inflammatory Response)

  • 유학선
    • 생명과학회지
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    • 제20권4호
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    • pp.503-510
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    • 2010
  • 대부분의 알려진 알러젠들은 단백분해효소의 성격을 가지고 있고 이는 알레르기 반응에서 Th2 면역 반응을 일으키는 데 중요한 역할을 하는 것으로 알려져 있다. 이러한 단백분해효소들과 반응하는 것으로 알려진 protease activated receptor (PAR) 는 4가지 종류가 있으며, 이 중 PAR2의 경우 알레르기 질환과 많은 상관관계를 보여 많은 연구가 되고 있다. 본 연구는 Aspergillus protease 알러젠에 의한 초기 및 만성 Th2 면역반응에서 PAR2 의 역할을 규명하기 위해 Aspergillus protease 알러젠으로 정상쥐와 PAR2 유전자 결핍쥐 모두 Th2 반응을 유도한 후 면역세포의 침윤 정도 및 Th2 관련 cytokine 및 chemokine 유전자들의 발현 정도를 비교하였다. 그 결과 Aspergillus protease 알러젠으로 비강내로 1회 처리했을 경우 중성구의 침윤이 두드러지는데, 이때 PAR2 결핍 마우스는 이러한 면역세포의 침윤이 유의적으로 감소하였다. 또한, 이와 관련된 IL-25, TSLP, Eotaxin 유전자들의 발현 역시 PAR2 결핍 마우스에 현저히 감소하였다. 한편, Aspergillus protease 알러젠으로 비강내로 6회 처리했을 경우 중성구 대신 호산구의 침윤이 두드러지지만 PAR2 결핍 마우스에서 그 정도가 유의적으로 낮았다. OVA 특이 IgE와 IgG1 농도 역시 현저하게 PAR2 결핍 마우스에서 낮았고, CCL21의 발현이 PAR2 결핍마우스 MEF cells에서 현저히 감소하였다. Th2 초기 면역반응에서 가장 중요한 IL-25의 발현에 MAKP p38 pathway가 관여한다는 것을 이번 연구에서 알 수 있다. 본 연구를 통해 Aspergillus protease 알러젠으로 유도된 알러지성 기관지 염증 반응에서 초기 반응뿐만 아니라 만성반응에서도 PAR2가 중요한 것을 알 수 있다.

Euglena gracilis 추출물의 면역조절 및 생리활성 분석 (Immunomodulatory Effects of Euglena gracilis Extracts)

  • 유선녕;박보배;김지원;황유림;김상헌;김선아;이태호;안순철
    • 생명과학회지
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    • 제31권2호
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    • pp.183-191
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    • 2021
  • 본 연구에서는 다양한 생리활성을 나타내는 compound를 함유하고 있는 것으로 알려진 Euglena gracilis를 hot water로 추출하고(HWE), 그 잔존물을 methanol로 추출(HWME)한 후, murine macrophage RAW 264.7 cell에 처리하여 면역활성을 측정하였다. Murine macrophage RAW 264.7 cell에서 HWE 처리로 IL-1β와 TNF-α가 농도의존적으로 증가되었고, lipopolysaccharide에 의해 유도되는 IL-6와 TNF-α 생성이 HWME 처리에 의해 유의적으로 억제되는 것을 확인하였다. 또한 α-glucosidase, protein tyrosine phosphatase (PTP1B), tyrosinase, xanthine oxidase (XO), angiotensin converting enzyme (ACE) 등에 대한 저해활성을 조사하였다. 그 결과, E. gracilis HWE 추출물에서는 α-glucosidase, tyrosinase, ACE에서 약한 억제 활성을 보였으나, HWME 추출물에서는 PTP1B와 XO에서 유의적인 억제활성을 나타냈다. 따라서 본 연구를 통하여 E. gracilis 추출물의 면역조절 활성 뿐 만 아니라 당뇨와 심혈관 질환에 대한 유의적인 억제활성을 통해 다양한 건강기능성 식품의 소재로 활용될 수 있을 것으로 사료된다.

A 24 kDa Excretory-Secretory Protein of Anisakis simplex Larvae Could Elicit Allergic Airway Inflammation in Mice

  • Park, Hye-Kyung;Cho, Min-Kyoung;Park, Mi-Kyung;Kang, Shin-Ae;Kim, Yun-Seong;Kim, Ki-Uk;Lee, Min-Ki;Ock, Mee-Sun;Cha, Hee-Jae;Yu, Hak-Sun
    • Parasites, Hosts and Diseases
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    • 제49권4호
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    • pp.373-380
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    • 2011
  • We have reported that a 24 kDa protein (22U homologous; As22U) of Anisakis simplex larvae could elicit several Th2-related chemokine gene expressions in the intestinal epithelial cell line which means that As22U may play a role as an allergen. In order to determine the contribution of As22U to allergic reactions, we treated mice with 6 times intra-nasal application of recombinant As22U (rAs22U). In the group challenged with rAs22U and ovalbumin (OVA), the number of eosinophils in the bronchial alveolar lavage fluid (BALF) was significantly increased, as compared to the group receiving only OVA. In addition, mice treated with rAs22U and OVA showed significantly increased airway hyperresponsiveness. Thus, severe inflammation around the airway and immune cell recruitment was observed in mice treated with rAs22U plus OVA. The levels of IL-4, IL-5, and IL-13 cytokines in the BALF increased significantly after treatment with rAs22U and OVA. Similarly, the levels of anti-OVA specific lgE and lgG1 increased in mice treated with rAs22U and OVA, compared to those treated only with OVA. The Gro-${\alpha}$ (CXCL1) gene expression in mouse lung epithelial cells increased instantly after treatment with rAs22U, and allergy-specific chemokines eotaxin (CCL11) and thymus-and-activation-regulated-chemokine (CCL17) gene expressions significantly increased at 6 hr after treatment. In conclusion, rAs22U may induce airway allergic inflammation, as the result of enhanced Th2 and Th17 responses.

연속배양을 통한 L-prolinc 발효공정의 최적화 연구

  • 유지명;최순용;장형욱;안정오;조영일;이홍원;정준기
    • 한국생물공학회:학술대회논문집
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    • 한국생물공학회 2001년도 추계학술발표대회
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    • pp.426-429
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    • 2001
  • The continuous production of L -proline was studied using L-histidine auxotrophic mutant of Corynebacterium acetoacidophilum under various substrate limited conditions. Among the $NH_4\;^+$ $PO_4\;^3$ and L -histidine limited conditions, the highest production of L -proline was observed under the L-histidine limited condition. Under $NH_4\;^+$ and $PO_4\;^3$ limited conditions, no or poor L-proline production was observed, respectively. For the kinetic parameters under L -histidine limitation the specific rate of L -proline production was increased with dilution rate upto $0.1hr^{-1}$ but decreased above $0.1hr^{-1}$. The volumetric rate of L -proline production was showed similar pattern with specific rate. The dried cell weight was gradually increased according to decrease the dilution rate. Specific rate of glucose consumption was proportionally increased with dilution rate. The results of continuous culture (higher production of L-proline at dilution rate $0.1hr^{-1}$) will be used in fed-batch culture for the control of cell growth rate and mass production of L-proline.

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기술사 자격취득요건 개선 방안 (Improvement Plan of the Requirements for Professional Engineer Certification)

  • 김선국;김태희;유정호
    • 한국건설관리학회논문집
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    • 제7권3호
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    • pp.86-93
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    • 2006
  • 현행 우리나라에서의 기술사 자격취득요건은 기술계와 기능계의 미분리, 대학교육 특히 공학교육인증 대학교육과의 연계 미비 등의 문제점으로 인하여, 선진 각국의 기술사 자격취득요건에 비하여 상당부분 그 요건이 미약한 실정으로서, 이러한 문제는 결국 우리나라 기술사의 국제 통용성 확보를 근본적으로 불가능하게 만드는 il인으로 작용하고 있다. 본 연구에서는 기술사 자격취득요건과 관련한 국제적 동향을 살펴보고 국내 제도와 선진국 제도를 고찰하여, 우리나라의 기술사 자격이 국제 통용성을 확보할 수 있는 방향으로 기술사 자격취득요건을 개선하기 위한 방안을 제시한다.

역해석과 소형펀치 시험에 의한 발전설비 용접부의 소성유동특성 평가 (An Evaluation of Plastic Flow Characteristic for local structure of Weldment in Power Plant using SP test and Inverse FEA)

  • 백승세;권일현;김회현;이동환;양성모;유호선
    • 대한기계학회:학술대회논문집
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    • 대한기계학회 2004년도 추계학술대회
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    • pp.308-313
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    • 2004
  • SP test has been confirmed the availability, however the application of SP test is hampered because the relation of stress-strain and load-displacement is not determined definitely. This study suggested an evaluation technique of plastic flow characteristic for X20CrMoV121 steel weldment through inverse analysis using SP test and finite element analysis(FEA). From the result, good agreement was found in load-displacement curves obtained from SP test and FEA. Also, The behavior of load-displacement curve from FEA show a rule that load is increase with increasing K(strength coefficient) and displacement is increase with increasing n(work hardening index). From the inverse analysis, true stress-strain curve could be obtained for each local structure of weldment. And the CGHAZ and WM, which showed lower load- displacement behavior, have smaller work hardening index, while FGHAZ have the largest index.

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Cloning and characterization of Giardia intestinalis cyclophilin

  • Yu, Hak-Sun;Kong, Hyun-Hee;Chung, Dong-Il
    • Parasites, Hosts and Diseases
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    • 제40권3호
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    • pp.131-138
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    • 2002
  • The cyclophilins (Cyps) are family members of proteins that exhibit peptidylprolyl cis-trans isomerase (PPIase, EC 5.2.1.8) activity and bind the immunosuppressive agent cyclosprin A (CsA) in varying degrees. During the process of random sequencing of a cDNA library made from Giardia intestinalis WB strain, the cyclophilin gene (gicypl) was isolated. An open reading frame of gicyp1 gene was 576 nucleotides, which corresponded to a translation product of 176 amino acids (Gicypl). The identity with other Cyps was about 58-71%. The 13 residues that constituted the CsA binding site of human cyclophilin were also detected in the amino acid sequence of Gicypl, including tryptophan residue essential for the drug binding. The single copy of the gicypl gene was detected in the G. intestinalis chromosome by southern hybridization analysis. Recombinant Gicyp 1 protein clearly accelerated the rate of cis ${\rightarrow}$ trans isomerization of the peptide substrate and the catalysis was completely inhibited by the addition of $0.5{\;}{\mu}M$ CsA.