• 제목/요약/키워드: tumor necrosis factor-a

검색결과 1,874건 처리시간 0.044초

Streptozotocin으로 당뇨가 유도된 C57BL/6 생쥐 지방조직에서의 염증성 사이토카인 유전자의 이상발현 (Altered Gene Expression of Inflammatory Cytokines in Adipose Tissue of Streptozotocin-induced Diabetic C57BL/6 Mice)

  • 이용호;김종봉
    • 생명과학회지
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    • 제23권6호
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    • pp.825-831
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    • 2013
  • 본 연구를 통하여 streptozotocin 주사에 의한 당뇨 유발이 일반식이와 고지방식이로 키운 C57BL/6 수컷생쥐의 지방조직에서의 염증성 사이토카인 유전자 발현에 미치는 영향을 조사하였다. 네 그룹의 당뇨생쥐(일반식이 또는 고지방식이로 키운 16주령 또는 26주령 생쥐)와 네 그룹의 비당뇨 대조군을 포함한 모두 73마리의 생쥐가 이 실험에 사용되었다. Real-time PCR을 이용하여 지방조직에서의 tumor necrosis factor-${\alpha}$ (TNF-${\alpha}$)와 monocyte chemoattractant protein-1 (MCP-1)의 유전자 발현량을 측정한 결과, TNF-${\alpha}$ mRNA는 당뇨 유발에 의해 증가하는 양상을 보였다. 특히, 16주령의 일반식이 생쥐의 경우 비당뇨 대조군에 비해 당뇨가 유발된 실험군에서 유의한 증가가 관찰되었다. MCP-1 mRNA 발현은 STZ처리에 따른 당뇨유발에 의해 감소하는 경향을 나타내었다. 특히, 16주령 고지방식이의 당뇨 실험군에서의 발현이 비당뇨 대조군에서의 발현량의 26%에 해당할 정도로 큰 감소를 나타내었다. 또한, MCP-1의 발현은 인슐린 농도와 유의한 상관관계가 있음이 확인되었다. 이들 실험결과는 당뇨 모델 생쥐에서 지방조직의 염증성 사이토카인이 이상발현되고 있음을 나타내며, 비만, 인슐린저항성, 및 당뇨에서의 저준위 염증상태와 지방조직에서의 염증성 사이토카인 발현 조절의 기작을 밝히는데 유용한 정보를 제공할 것으로 기대된다.

In vitro와 in vivo에서 라이코펜이 EPCR 탈락에 미치는 영향 (Effects of Lycopene on Endothelial Protein C Receptor Shedding In Vitro and In Vivo)

  • 유하영;이현식;이원화;배종섭
    • 생명과학회지
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    • 제23권5호
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    • pp.650-656
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    • 2013
  • 내피세포 단백질 C 수용체(EPCR)가 트롬빈-트롬보모듈린 복합체에 의한 단백질 C (PC) 활성 증가에 중요한 역할을 한다. EPCR의 활성은 ecodomain의 분열과 수용성 단백질(sEPCR)로 분비함으로써 현저하게 변화한다. EPCR의 탈락은 tumor necrosis factor-${\alpha}$ converting enzyme (TACE)에 의해 매개된다. 토마토에서 발견된 라이코펜은 항산화 효과, 항암 효과, 항염증 효과를 가지고 있다. 그러나 EPCR 탈락에서의 라이코펜의 효과는 알려지지 않았다. 우리는 라이코펜이 PMA, TNF-${\alpha}$, IL-$1{\beta}$와 CLP에 의해 유도된 EPCR 탈락에 미치는 영향을 연구했다. 그 결과, 라이코펜은 TACE의 발현을 억제시켜 PMA, TNF-${\alpha}$, IL-$1{\beta}$와 CLP에 의해 매개된 EPCR 탈락을 저해함을 보여준다. 또한 라이코펜은 PMA가 유발한 p38, ERK1/2, JNK의 인산화를 감소시켰다. 이러한 결과를 토대로, 라이코펜은 EPCR 탈락의 저해를 통해 다양한 중증 혈관 염증 질병 치료를 위한 후보 물질이 될 수 있을 것이다.

호흡기계암세포주에서 TNF-$\alpha$ 유전자의 이입이 항암제 감수성에 미치는 효과 (Effect of TNF-$\alpha$ Gene Transfer to Respiratory Cancer Cell Lines on Sensitivity to Anticancer drugs)

  • 모은경;이재호;이계영;유철규;김영환;한성구;심영수;최형석
    • Tuberculosis and Respiratory Diseases
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    • 제42권3호
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    • pp.302-313
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    • 1995
  • 연구배경: 종양괴사인자(Tumor necrosis factor; TNF)는 다양한 생물학적인 작용을 가지며 종양 세포에 대한 세포 독성은 그 대표적인 기능중의 하나이다. TNF-$\alpha$는 생체외에서(in vitro) 몇몇 종양 세포주에 대하여 항암제, 특히 topoisomerase II targeted chemotherapeutic agent의 세포 독성 효과를 상승적으로 증가시키는 것이 알려져 있다. 최근 암세포에 대한 cytokine 유전자 요법에서 TNF는 중요한 대상으로 여겨지고 있으며, 유전자 이입에 의해 암조직이 TNF를 생성하게 될 경우 암 증식 억제 효과가 있음이 보고되고 있다. 연구자는 암세포에 TNF-$\alpha$ 유전자를 이입하여 자신이 TNF-$\alpha$를 생성하도록 형질을 변환시킨 암세포는 topoisomerase II 억제 항암제에 대한 김수성에 변화가 있을 것이라는 가설을 수립하였고 이를 검증하고자 본 연구를 수행하였다. 본 연구에서는 생체외로(in vitro) TNF-$\alpha$ 유전자를 이입하여 TNF-$\alpha$를 생성하는 암세포주에서 topoisomerase II targeted drug에 대한 항암제 감수성 효과가 모세포주에 비하여 증대될 수 있는지를 알아 보고자하였다. 방법: TNF-$\alpha$에 감수성을 보이는 것으로 알려진 인체 중피종 세포주인 NCI-H2058 세포주 및 생쥐의 섬유육종 세포주인 WEHI164 세포주와 인체 비소세포 폐암 세포주인 A549 세포주를 배양하여, 먼저 임상에서 흔히 폐암의 항암 화학 요법 치료에 널리 쓰이는 대표적인 topoisomerase II targeted chemotherapeutic drug인 etoposide(VP-16)와 doxorubicin(adriamycin)을 가하였을 때 관찰된 세포 독성을 MTT assay로 측정하고, 각 모세포주(parenta1 cell line)에 TNF-$\alpha$의 유전자를 이입시켜서 형절 변환한 세포주(transformed cell line)에 대하여 각각 동일한 항암제를 가하였을 때 관찰된 세포 독성의 정도를 같은 방법으로 측정하여, 그 결과를 비교 분석하였다. 또한 모세포주에 외부에서 TNF를 가하여 전처치한 후 동일한 항암제를 가하였을 때의 세포독성을 관찰하여 비교 분석하였다. 결과: H2058 세포주에서는 TNF-$\alpha$ 유전자를 이입한 세포주 topoisomerase II targeted drug을 가하였을 때, 항암제 감수성이 모세포주에 같은 항암제를 가하였을 때에 비하여 의미있게 증가함을 관찰할 수 있었으나(p<0.05), WEHI 세포주와 A549 세포주에 있어서는 TNF-$\alpha$ 유전자를 이입한 세포주에서 모세포주에 비하여 항암제 감수성이 증가하지는 않았다. 결론: TNF-$\alpha$ 유전자의 이입이 topoisomerase II targeted chemotherapeutic drug에 대한 항암제 감수성을 증가시키는 효과는 세포주에 따라 다양한 결과를 보이는 것을 알 수 있었으며, 적어도 선택된 특정 종류의 호흡기계 암세포에 있어서는 TNF-$\alpha$ 유전자의 이입으로 항암제 감수성(chemosensitivity)을 증가시킬 수 있을 것으로 사료된다.

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Genipin Selectively Inhibits TNF-${\alpha}$-activated VCAM-1 But Not ICAM-1 Expression by Upregulation of PPAR-${\gamma}$ in Human Endothelial Cells

  • Jung, Seok-Hwa;Mun, Lidiya;Kim, Hye-Jung;Seo, Han-Geuk;Lee, Jae-Heun;Kwak, Jong-Hwan;Lee, Dong-Ung;Chang, Ki-Churl
    • The Korean Journal of Physiology and Pharmacology
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    • 제15권3호
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    • pp.157-162
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    • 2011
  • Vascular inflammation process has been suggested to be an important risk factor in the development of atherosclerosis. Recently we reported that induction of peroxisome proliferator-activated receptor-${\gamma}$ (PPAR-${\gamma}$) selectively inhibits vascular cell adhesion molecule-1 (VCAM-1) but not intercellular cell adhesion molecule-1 (ICAM-1) in tumor necrosis factor (TNF)-${\alpha}$-activated human umbilical vein endothelial cells (HUVEC). In this study, we investigated whether genipin inhibits expression of cellular adhesion molecules, which is relevant to inflammation. Pretreatment with genipin reduced reactive oxygen species (ROS) production and expression of VCAM-1, but not ICAM-1 in TNF-${\alpha}$-activated HUVEC. Genipin dose- and time-dependently increased PPAR-${\gamma}$ expression and inhibited TNF-${\alpha}$-induced phosphorylation of Akt and PKC with different degrees. Finally, genipin prevented TNF-${\alpha}$-induced adhesion of U937 monocytic cells to HUVEC. Taken together, these results indicate that upregualtion of PPAR-${\gamma}$ by genipin selectively inhibits TNF-${\alpha}$-induced expression of VCAM-1, in which regulation of Akt and/or PKC play a key role. We concluded that genipin can be used for the treatment of cardiovascular disorders such as atherosclerosis.

Regulatory Effect of Atopic Allergic Reaction by Pachydictyon coriaceum

  • Na, Ho-Jeong;Moon, Phil-Dong;Hong, Seung-Heon;Seo, Young-Wan;Kim, Hyung-Min
    • 대한약학회:학술대회논문집
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    • 대한약학회 2003년도 Proceedings of the Convention of the Pharmaceutical Society of Korea Vol.1
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    • pp.135.2-135.2
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    • 2003
  • We studied the effect of methanol extract of Pachydictyon coriaceum (PC) on atopic allergic reaction. PC dose-dependently inhibited interleukin (IL)-8 and tumor necrosis factor (TNF)-$\alpha$ secretion from the PMA- pius A23187- stimulated HMC-1. PC also dose-dependently inhibited the histamine and $\beta$-hexosaminidase release from mast cells. PC had no cytotoxic effect. (omitted)

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Regulatory Effect of Atopic Allergic Reaction by Sargassum hemiphylum

  • Na, Ho-Jeong;Moon, Phil-Dong;Hong, Seung-Heon;Seo, Young-Wan;Kim, Hyung-Min
    • 대한약학회:학술대회논문집
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    • 대한약학회 2003년도 Proceedings of the Convention of the Pharmaceutical Society of Korea Vol.1
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    • pp.136.1-136.1
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    • 2003
  • We studied the effect of methanol extract of Sargassum hemiphylum(SH) on atopic allergic reaction. SH dose-dependently inhibited interleukin (IL)-8 and tumor necrosis factor (TNF)-$\alpha$ secretion from the PMA- plus A23187- stimulated HMC-1. SH also dose-dependently inhibited the histamine and $\beta$-hexosaminidase release from mast cells. (omitted)

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Inhibitory effect of Lonicera Japonica on trypsin-induced inflammatory mediator secretion from human leukemic mast cells

  • Kang, Ok-Hwa;Kim, Jin-Ah;Baek, Ok-Seon;Lee, Young-Mi
    • 대한약학회:학술대회논문집
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    • 대한약학회 2002년도 Proceedings of the Convention of the Pharmaceutical Society of Korea Vol.2
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    • pp.254.2-254.2
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    • 2002
  • Mast cells play an important role in inflammation by functioning as a source of histamine, tryptase, and proinflammatory cytokines. Lonicera Japonica (Caprifoliaceae. Lc) has been used to treat inflammation. We investigated whether the water extract of Lonicera Japonica(Lc) inhibit production of inflammatory mediators such as tryptase and tumor-necrosis factor (TNF)-${\alpha}$, and phosphorylation of extracellular signal-regulated kinase(ERK) in trypsin-stimulated HMC-1. (omitted)

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Tumor Necrosis Factor-alpha and Apoptosis Following Spinal Nerve Ligation Injury in Rats

  • Kim, Sung-Hoon;Nam, Jae-Sik;Choi, Dae-Kee;Koh, Won-Wook;Suh, Jeong-Hun;Song, Jun-Gol;Shin, Jin-Woo;Leem, Jeong-Gil
    • The Korean Journal of Pain
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    • 제24권4호
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    • pp.185-190
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    • 2011
  • Background: Spinal nerve ligation (SNL) injury in rats produces a pain syndrome that includes mechanical and thermal allodynia. Previous studies have indicated that proinflammatory cytokines such as tumor necrosis factor-${\alpha}$ (TNF-${\alpha}$) play an important role in peripheral mediation of neuropathic pain, and that altered dorsal root ganglion (DRG) function and degree of DRG neuronal apoptosis are associated with spinal nerve injury. The present study was conducted to evaluate the expression of TNF-${\alpha}$ and the extent of apoptosis in the dorsal root ganglion after SNL in rats. Methods: Sprague-Dawley rats were subjected to SNL of the left L5 and L6 spinal nerves distal to the DRG and proximal to the formation of the sciatic nerve. At postoperative day 8, TNF-${\alpha}$ protein levels in the L5.6 DRG were compared between SNL and naive groups using ELISA. In addition, we compared the percentage of neurons injured in the DRG using immunostaining for apoptosis and localization of activated caspase-3. Results: SNL injury produced significant mechanical and cold allodynia throughout the 7-day experimental period. TNF-${\alpha}$ protein levels were increased in the DRG in rats that had undergone SNL ($12.7{\pm}3.2$ pg/100 ${\mu}g$, P < 0.001) when compared with naive rats ($4.1{\pm}1.4$ pg/100 ${\mu}g$). The percentage of neurons or satellite cells co-localized with activated caspase-3 were also significantly higher in rats with SNL than in naive rats (P < 0.001, P < 0.05, respectively). Conclusions: SNL injury produces mechanical and cold allodynia, as well as TNF-${\alpha}$ elevation and apoptosis in the DRG.

A Study on the Association between Tumor Necrosis Factor Alpha Gene Polymorphism and Sasang Constitution in Cerebral Infarction

  • Lee Jae-Heung;Joo Jong-Cheon;Kim Kyung-Yo;Lee Sang-Min;Yoo Gwan-Seok;Ko Ki-Duk;Park Soo-Jeong;Lee Kyung-Sung;Choi Yong-Seok;Kim Jong-Yeol
    • 대한한의학회지
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    • 제26권1호
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    • pp.59-70
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    • 2005
  • Objective: Tumor necrosis factor-a $(TNF-{\alpha})$, a potent immuno-modulator and pro-inflammatory cytokine, has been implicated in many pathological processes. In this study, the author examined whether promoter region polymorphism in the $TNF-{\alpha}$a gene at position-308 affect the odds of cerebral infarction (CI) and whether genetic risk is enhanced by sasang constitutional classification. Methods: 212 CI patients and 610 healthy controls were genotyped and determined according to sasang constitutional classification. The amplified genotypes were analyzed on $8\%$ polyacrylamide gel. The alleles were visualized by ethidium bromide staining. Primers for $TNF-{\alpha}$ were designed to incorporate a polymorphic site at a position -308 bp of the $TNF-{\alpha}$ gene into an NcoI restriction site. Restriction digests generated products of 87 and 20 bp for G allele and 107 bp for A allele. Results : A significant decrease was found for the $TNF-{\alpha}$ A allele in CI patients compared with controls (P=0.033, odds ratio, O.R.: 0.622). However, there was no significant association between $TNF-{\alpha}$ polymorphism and sasang constitution in CI patients. Conclusion: My finding suggests that $TNF-{\alpha}$promoter region polymorphism is responsible for susceptibility to CI in Koreans.

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Association of a genetic polymorphism of IL1RN with risk of acute pancreatitis in a Korean ethnic group

  • Park, Jin Woo;Choi, Ja Sung;Han, Ki Joon;Lee, Sang Heun;Kim, Eui Joo;Cho, Jae Hee
    • The Korean journal of internal medicine
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    • 제33권6호
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    • pp.1103-1110
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    • 2018
  • Background/Aims: Several epidemiological studies have validated the association of interleukin gene polymorphisms with acute pancreatitis (AP) in different populations. However, there have been few studies in Asian ethnic groups. We aimed to investigate the relationships between inflammatory cytokine polymorphisms and AP as pilot research in a Korean ethnic group. Methods: Patients who had been diagnosed with AP were prospectively enrolled. DNA was extracted from whole blood, and DNA sequencing was subsequently performed. Single-nucleotide polymorphisms (SNPs) of the interleukin $1{\beta}$ (IL1B), interleukin 1 receptor antagonist (IL1RN), and tumor necrosis factor ${\alpha}$ (TNFA) genes of patients with AP were compared to those of normal controls. Results: Between January 2011 and January 2013, a total of 65 subjects were enrolled (40 patients with AP vs. 25 healthy controls). One intronic SNP (IL1RN -1129T>C, rs4251961) was significantly associated with the risk of AP (odds ratio, 0.304; 95% confidence interval, 0.095 to 0.967; p = 0.043). However, in our study, AP was not found to be associated with polymorphisms in the promoter regions of inflammatory cytokine genes, including IL1B (-118C>T, c47+242C>T, +3954C/T, and -598T>C) and TNFA (-1211T>C, -1043C>A, -1037C>T, -488G>A, and -418G>A). Conclusions: IL1RN -1129T>C (rs4251961) genotypes might be associated with a significant increase of AP risk in a Korean ethnic group.