Ku, Sae-Kwang;Yoon, Eun-Kyung;Lee, Hyun Gyu;Han, Min-Su;Lee, Taeho;Bae, Jong-Sup
BMB Reports
/
v.48
no.11
/
pp.624-629
/
2015
Lysozyme protects us from the ever-present danger of bacterial infection and binds to bacterial lipopolysaccharide (LPS) with high affinity. Beyond its role in the activation of protein C, the endothelial cell protein C receptor (EPCR) plays an important role in the cytoprotective pathway. EPCR can be shed from the cell surface, which is mediated by tumor necrosis factor-α converting enzyme (TACE). However, little is known about the effects of lysozyme on EPCR shedding. We investigated this issue by monitoring the effects of lysozyme on phorbol-12-myristate 13-acetate (PMA)-, tumor necrosis factor (TNF)-α-, interleukin (IL)-1βand cecal ligation and puncture (CLP)-mediated EPCR shedding and underlying mechanism. Data demonstrate that lysozyme induced potent inhibition of PMA-, TNF-α-, IL-1β-, and CLP-induced EPCR shedding. Lysozyme also inhibited the expression and activity of PMA-induced TACE in endothelial cells. These results demonstrate the potential of lysozyme as an anti-EPCR shedding reagent against PMA-mediated and CLP-mediated EPCR shedding.
Park, Gyoung Lim;Park, Minkyung;Min, Jeong-Ki;Park, Young-Jun;Chung, Su Wol;Lee, Seon-Jin
BMB Reports
/
v.54
no.11
/
pp.545-550
/
2021
Anisomycin is known to inhibit eukaryotic protein synthesis and has been established as an antibiotic and anticancer drug. However, the molecular targets of anisomycin and its mechanism of action have not been explained in macrophages. Here, we demonstrated the anti-inflammatory effects of anisomycin both in vivo and in vitro. We found that anisomycin decreased the mortality rate of macrophages in cecal ligation and puncture (CLP)- and lipopolysaccharide (LPS)-induced acute sepsis. It also declined the gene expression of proinflammatory mediators such as inducible nitric oxide synthase, tumor necrosis factor-α, and interleukin-1β as well as the nitric oxide and proinflammatory cytokines production in macrophages subjected to LPS-induced acute sepsis. Furthermore, anisomycin attenuated nuclear factor (NF)-κB activation in LPS-induced macrophages, which correlated with the inhibition of phosphorylation of NF-κB-inducing kinase and IκB kinase, phosphorylation and IκBα proteolytic degradation, and NF-κB p65 subunit nuclear translocation. These results suggest that anisomycin prevented acute inflammation by inhibiting NF-κB-related inflammatory gene expression and could be a potential therapeutic candidate for sepsis.
Electrical insulation and mechanical properties of the plasma sprayed oxide ceramic coatings were studied before and after the sealing treatment of the ceramic coatings. Plasma sprayed A1$_2$O$_3$-TiO$_2$ coating as the reference coating was sealed using three commercial sealants based on polymer. Penetration depth of the sealants to the ceramic coating was evaluated directly from the optical microscope using a fluorescent dye. It is estimated that the penetration depth of the sealants to the ceramic coating is from 0.2 to 0.5 mm depending on the sealants used. The preliminary test results with a DC puncture tester imply that the dielectric breakdown voltage mechanism of plasma sprayed ceramic coatings has been determined to be a corona mechanism. Dielectric breakdown voltage of the as-sprayed and as-ground samples have shown a linear trend with regard to the thickness showing an average dielectric strength of 20 kV/mm for the thickness scale studied. It is also shown that grinding the coating before sealing and adding fluorescent dye do not agent the penetration depth of sealants. All of the microhardness, two-body abrasive wear resistance, bond strength, and surface roughness of the ceramic coating after the sealing treatment are improved. The extent of improvement is different from the sealants used. However, three-point bending stress of the ceramic coating after the sealing treatment is decreased. This is attributed to the reduced micro-crack toughening effect since the cracks propagate easily through the lamellar of the coating without crack deflection and/or branching after the sealing treatment.
Objective: In this study, the analgesic effect of gold injection aqua-acupuncture on CFA induced arthritis in rats was inverstigated. Furthermore, to determine the antinociceptive mechanism of gold injection aqua-acupuncture, naloxone and yohimbine were administrated intraperitoneally 15min prior to the gold injection aqua-acupuncture. Methods: The experimental groups were divided into 6 groups. Control group, NSI, AMI, AMI+SL : AMI+Nx, AMI+Yb. Thereafter we measured the chages of TFL between control and experimental groups. Results: 1. The tail flick latency induced by CFA was significantly increased on AMI as compared with the NSI group. 2. Effect of sodium aurothiomalate aqua-acupuncture in TFL on CFA was decreased after application of naloxone. The anti-nociceptive effect of AMI was completely antagonized by naloxone(an opioid receptor antagonist). 3. Effect of sodium aurothiomalate aqua-acupuncture in TFL on CFA was decreased after application of yohimbine. The anti-nociceptive effect of AMI was completely antagonized by yohimbine(${\alpha}2$-adrenoceptor antagonist). Conclusions: According to the results, gold injection aqua-acupuncture has significant analgesic effects on adjuvant induced arthritis in rats and the effect of anti-nociception was mediated by opiodergic system and ${\alpha}2$-adrenergic system.
Proceedings of the Korean Society of Applied Pharmacology
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2003.11a
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pp.77-77
/
2003
Sepsis remains common surgical problems with high morbidity and mortality despite improvement in the management for septic patient. Although hepatocellular dysfunction occurs during sepsis, the mechanism responsible for this remains unclear. In sepsis, a state of severe oxidative stress is encountered, with host endogenous antioxidant defenses overcome. Therefore, the aim of this study was to determine the effect of a-tocopherol (AT) vasoregulatory gene expression during polymicrobial sepsis. Rats were subjected to polymicrobial sepsis by cecal ligation and puncture (CLP). AT (15 mg/kg) was intraperitonealy injected for 3 days prior to CLP. Blood samples were taken 24 h after CLP for measurement of the extent of hepatocellular damage. Liver samples were taken for RT-PCR analysis of mRNA for genes of interest: endothelin-l (ET-l), its receptors $ET_{A}$ and $ET_{B}$, nitric oxide synthases (iNOS and eNOS), cyclooxygenase-2 (COX -2), heme oxygenase-l (HO-l), and tumor necrosis factor-$\alpha$ (TNF-$\alpha$). The activities of serum alanine aminotransferase and lipid peroxidation level were significantly increased; an increase which was prevented by AT pretreatment. CLP significantly increased the mRNA levels of ET-1 and $ET_{B}$; an increase that was prevented by AT pretreatment. However, the level of $ET_{A}$ mRNA significantly decreased after CLP; a decrease that was not prevented by AT pretreatment. There were significant increases in the mRNA expression of iNOS, HO-l and COX -2 in CLP groups. This increase was prevented by AT pretreatment. The expression of eNOS and TNF-$\alpha$ mRNA significantly increased in CLP, which was not prevented by AT pretreatment. Our findings suggest that there was an imbalanced vasoregulatory gene expression in sepsis, and AT ameliorates this change through its free radical scavenging activity.
Objectives : Bambusae Caulis in Liquamen (BCL) has been used for stamina fortification in Oriental Medicine for thousand years. The goal of the present study was to investigate the muscle antifatigue effect of BCL. Methods : The mice were divided into three groups. The control group was allowed to swim for 10 minutes without BCL infusion. For the preventive effect of BCL, another group referred to BCL-1 was fed with BCL an hour before the swimming exercise. BCL-2 group for the reversion effect was forced to swim for 10 minutes at first, then fed with BCL followed by half an hour rest and another 10 minute swimming exercise. All the serum samples collected by heart puncture were used for the measuring biochemical factors such as LDH, CPK, glucose, lactate, triglycerides and total cholesterol. Results : In the BCL-2 group, lactate and LDH were significantly reduced compared to the control. BCL infusion during the exercise was effective in metabolizing LDH, reducing the conversion ratio of pyruvate into lactate. In the BCL-1 group, it was not effective in antifatigue function. The level of glucose was significantly reduced in BCL-1 group compared to the control. When the BCL was infused before the exercise, it is assumed that glycogenolysis seen during the exercise was prevented. When the BCL was infused during the exercise, the triglycerides and total cholesterol were increased significantly compared to the control. BCL seems to cause the increase of lipolysis to utilize the fat as an energy source. Unlike other parameters, CPK did not show any changes from BCL infusion. Conclusions : Based on the above results, BCL is found to be involved in energy metabolism. Further studies are needed to find out the underlying mechanism of BCL for its effect on stamina fortification.
Haiyan Xiang;Yun Zhang;Yan Wu;Yaling Xu;Yuanhao Hong
The Korean Journal of Physiology and Pharmacology
/
v.28
no.1
/
pp.11-19
/
2024
Acute kidney injury (AKI) is one of the major complications of sepsis. Aurantio-obtusin (AO) is an anthraquinone compound with antioxidant and anti-inflammatory activities. This study was developed to concentrate on the role and mechanism of AO in sepsis-induced AKI. Lipopolysaccharide (LPS)-stimulated human renal proximal tubular epithelial cells (HK-2) and BALB/c mice receiving cecal ligation and puncture (CLP) surgery were used to establish in vitro cell model and in vivo mouse model. HK-2 cell viability was measured using MTT assays. Histological alterations of mouse renal tissues were analyzed via hematoxylin and eosin staining. Renal function of mice was assessed by measuring the levels of serum creatinine (SCr) and blood urea nitrogen (BUN). The concentrations of pro-inflammatory cytokines in HK-2 cells and serum samples of mice were detected using corresponding ELISA kits. Protein levels of factors associated with nuclear factor kappa-B (NF-κB) pathway were measured in HK-2 cells and renal tissues by Western blotting. AO exerted no cytotoxic effect on HK-2 cells and AO dose-dependently rescued LPS-induced decrease in HK-2 cell viability. The concentrations of pro-inflammatory cytokines were increased in response to LPS or CLP treatment, and the alterations were reversed by AO treatment. For in vivo experiments, AO markedly ameliorated renal injury and reduced high levels of SCr and BUN in mice underwent CLP operation. In addition, AO administration inhibited the activation of NF-κB signaling pathway in vitro and in vivo. In conclusion, AO alleviates septic AKI by suppressing inflammatory responses through inhibiting the NF-κB pathway.
Hwang, So Ryeon;Jo, Ji Hoon;Shin, Kyeong Min;Jang, Yun Young;Kim, Ji Youn;Yeo, Kyeong Uk;Kim, Hyoung Ah;Heo, Yong
Journal of Environmental Health Sciences
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v.38
no.6
/
pp.541-549
/
2012
Objectives: This study was undertaken in order to evaluate a potential mechanism involved in gastro-intestinal problems observed in autistic subjects and uses an animal model of autism investigation. Methods: BTBR T+tf/J, a mouse strain with typical socio-behavioral characteristics of autistic subjects and FVB mice with highly social behaviors as the control strain were used. Both genders of mice aged three weeks and six months were used from four separate litters for each strain. Serum was prepared following cardiac puncture, and mesenteric lymph nodes were collected for in vitro stimulation and enumeration of major immune cell proportion. Results: The level of serum IgA was significantly enhanced in six-month-old BTBR mice compared with three-week-old BTBR, which was not observed with the FVB control mice. The serum IgE level was also higher among BTBR mice than among age-sex matched FVB mice, respectively. Considering the ratio of interleukin-4 vs interferon-gamma production from mesenteric lymph node T cells, skewedness toward type-2 reactivities was observed. In addition, the proportion of B cells in mesenteric lymph nodes was significantly higher in BTBR mice than in FVB mice. Conclusion: Upregulation of mucosal immunity related with enhanced type-2 immune reactivity observed in BTBR mice could be involved with the etiology of gastro-intestinal abnormalities in autism.
Lee, Yong Keun;Shin, Hyo-Keun;Kwon, Woon Yong;Suh, Gil Joon;Youn, Yeo Kyu
Journal of Trauma and Injury
/
v.21
no.1
/
pp.59-65
/
2008
Purpose: The aim of this study was to evaluate the effect of overexpression of heat shock protein 70 (HSP70) on the expression of inducible nitric oxide synthase and on the concentration of nitric oxide and to determine the mechanism for the relationship between HSP70 and inducible nitric oxide synthase (iNOS) in sepsis. Methods: Experiments were performed on male Sprague-Dawley rats, and sepsis was induced by using cecal ligation and puncture (CLP). Glutamine (GLN) or saline was administered 1 h after initiation of sepsis. We acquired serum and lung tissues from the rats 12 h or 24 h after initiation of sepsis. We analyzed the concentration of nitric oxide, the expression of HSP70 in the lung, and the gene expression of iNOS in the lung. Results: In CLP+GLN, glutamine given after initiation of sepsis enhanced the expression of HSP70 in the lung at 12 h (CLP+GLN vs. CLP:: $47.19{\pm}10.04$ vs. $33.22{\pm}8.28$, p = 0.025) and 24 h (CLP+GLN vs. CLP: $47.06{\pm}10.60$ vs. $31.90{\pm}4.83$, p = 0.004). In CLP+GLN, glutamine attenuated the expression of iNOS mRNA in the lung at 12 h (CLP+GLN vs. CLP: $4167.17{\pm}951.59$ vs. $5513.73{\pm}1051.60$, p = 0.025) and 24 h (CLP+GLN vs. CLP: $9,437.65{\pm}2,521.07$ vs. $18,740.27{\pm}8,241.20$, p = 0.016) and reduced the concentration of nitric oxide in serum at 12 h (CLP+GLN vs. CLP: $0.86{\pm}0.48$ vs. $3.82{\pm}2.53{\mu}mol/L$, p = 0.016) and 24 h (CLP+GLN vs. CLP: $0.39{\pm}0.25$ vs. $1.85{\pm}1.70{\mu}mol/L$, p = 0.025). Conclusion: The overexpression of HSP70 induced by the administration of glutamine in sepsis attenuated the gene expression of iNOS and reduced the concentration of nitric oxide.
Journal of the Korean Association of Oral and Maxillofacial Surgeons
/
v.36
no.5
/
pp.346-352
/
2010
Introduction: Heat shock protein70 (HSP70) is a highly conserved family of proteins produced after a variety of stresses. Many studies reported that the overexpression of HSP70 can improve the prognosis of the patients with sepsis through a reduction of the nitric oxide concentration. However, these results only revealed the effect of HSP70 and nitric oxide. No studies have examined the relationship between HSP70 and nitric oxide. The aim of this study was to evaluate the effect of the overexpression of HSP70 on the expression of inducible nitric oxide synthase and the nitric oxide concentration. In addition, the mechanism of the relationship of HSP70 and inducible nitric oxide synthase (iNOS) in sepsis was examined. Materials and Methods: The experiments were performed on male sprague-dawley rats. Sepsis was induced by a cecal ligation and puncture (CLP). Glutamine (GLN) or saline was administered 1 hour after the initiation of sepsis. Serum and lung tissues were acquired from the rats 12 hours or 24 hours after the initiation of sepsis. The nitric oxide concentration, the expression of HSP70 in lung, and the gene expression of iNOS in lung were analyzed. The three groups, sham operation, CLP and CLP+GLN, were compared. Results: Compared to the other groups, in CLP+GLN, GLN administered after the initiation of sepsis enhanced the expression of HSP70 in the lung at 12 hours ($47.19{\pm}10.04$ vs. $33.22{\pm}8.28$, P=0.025) and 24 hours ($47.06{\pm}10.60$ vs. $31.90{\pm}4.83$, P=0.004). In CLP+GLN, GLN attenuated the expression of iNOS messenger RNA (mRNA) in the lung at 12 hours ($5,513.73{\pm}1,051.60$ vs. $4,167.17{\pm}951.59$, P=0.025) and 24 hours ($18,740.27{\pm}8,241.20$ vs. $9,437.65{\pm}2,521.07$, P=0.016), and reduced the concentration of nitric oxide in the serum at 12 hours ($0.86{\pm}0.48$ vs. $3.82{\pm}2.53$, P=0.016) and 24 hours ($0.39{\pm}0.25$ vs. $1.85{\pm}1.70$, P=0.025). Conclusion: The overexpression of HSP70 induced by the administration of GLN in sepsis attenuates the expression of the iNOS gene but reduces the nitric oxide concentration.
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