Renal dipeptidase (RDPase, membrane dipeptidase, dehydropeptidase 1, EC 3.4.13.19) has been widely studied since it was first purified from porcine kidney brush border membrane. It was reported that RDPase activity in urine samples of acute and chronic renal failure patients decreases. Nitric oxide (NO) is a highly reactive free radical involved in a number of physiological and pathological processes. NO is able to act in a dual mode, leading either to induction of apoptosis or to blunted execution of programmed cell death. NO inhibited the RDPase release from porcine renal proximal tubules, which could be blocked by L-NAME. Chitosan, the linear polymer of D-glucosamine in $\beta$(1\longrightarrow4) linkage, not only reversed the decreased RDPase release by NO but also increased NO production in the proximal tubule cells. The stimulatory effect of NO on RDPase release from proximal tubules in the presence of chitosan must be different from the previously proposed mechanism of RDPase release via NO signaling pathway. Chitosan stimulated the RDPase release in the proximal tubules and increased RDPase activity to 220% and 250% at 0.1% and 1%, respectively. RDPase release was decreased to about 40% in the injured proximal tubules and was recovered in proportion to the increase of chitosan. Chitosan may be useful in recovery of renal function from $HgCl_2$injury.
Oxidative stress or accumulation of reactive oxygen species (ROS) leads neuronal cellular death and dysfunction, and it contributes to neuronal degenerative disease such as Alzheimer's disease, Parkinson's disease and stroke. Glutamate is one of the major excitatory neurotransmitter in the central nervous system (CNS). Glutamate contributes to fast synaptic transmission, neuronal plasticity, outgrowth and survival, behavior, learning and memory. In spite of these physiological functions, high concentration of glutamate causes neuronal cell damage, acute insults and chronic neuronal neurodegenerative diseases. Heme oxygenase-1 (HO-1) enzyme plays an important role of cellular antioxidant system against oxidant injury. NNMBS020, the water-insoluble fraction of the 70% EtOH extract of root barks of Dictamnus dasycarpus, showed dominant neuroprotective effects on glutamate-induced neurotoxicity in mouse hippocampal HT22 cells by induced the expression of HO-1 and increased HO activity. In mouse hippocampal HT22 cells, NNMBS020 makes the nuclear accumulation of Nrf2 and stimulates extracellular signal-regulated kinase (ERK) pathway. The ERK MAPK pathway inhibitor significantly reduced NNMBS020-induced HO-1 expression, whereas the JNK and p38 inhibitors did not. In conclusion, the water-insoluble fraction of the 70% EtOH extract of root barks of D. dasycarpus (NNMBS020) significantly protect glutamate-induced oxidative damage by induction of HO-1 via Nrf2 and ERK pathway in mouse hippocampal HT22 cells.
Cordycepin exerts neuroprotective effects against excitotoxic neuronal death. However, its direct electrophysiological evidence in Alzheimer's disease (AD) remains unclear. This study aimed to explore the electrophysiological mechanisms underlying the protective effect of cordycepin against the excitotoxic neuronal insult in AD using whole-cell patch clamp techniques. ${\beta}$-Amyloid ($A{\beta}$) and ibotenic acid (IBO)-induced injury model in cultured hippocampal neurons was used for the purpose. The results revealed that cordycepin significantly delayed $A{\beta}$ + IBO-induced excessive neuronal membrane depolarization. It increased the onset time/latency, extended the duration, and reduced the slope in both slow and rapid depolarization. Additionally, cordycepin reversed the neuronal hyperactivity in $A{\beta}$ + IBO-induced evoked action potential (AP) firing, including increase in repetitive firing frequency, shortening of evoked AP latency, decrease in the amplitude of fast afterhyperpolarization, and increase in membrane depolarization. Further, the suppressive effect of cordycepin against $A{\beta}$ + IBO-induced excessive neuronal membrane depolarization and neuronal hyperactivity was blocked by DPCPX (8-cyclopentyl-1,3-dipropylxanthine, an adenosine $A_1$ receptor-specific blocker). Collectively, these results revealed the suppressive effect of cordycepin against the $A{\beta}$ + IBO-induced excitotoxic neuronal insult by attenuating excessive neuronal activity and membrane depolarization, and the mechanism through the activation of $A_1R$ is strongly recommended, thus highlighting the therapeutic potential of cordycepin in AD.
Objectives : Alcoholic fatty liver is an early and reversible consequence of excessive alcohol consumption. The initial hepatocyte cell death stimulates subsequent inflammatory responses, leading to further liver injury and fibrosis. The objective of this study is to investigate the effects of Injinsaryung-san extract on the alcoholic fatty liver by chronic EtOH administration. Method : Male Sprague Dawley rats were used in this study. All animals were randomly divided into Normal group, treated with saline (n=10); EtOH group, treated with ethanol (n=10); EtOH+IS group, treated with ethanol+Injinsaryung-san extract (n=10). For oral administration of ethanol in Control and Sample group, the ethanol was dissolved in distilled water in concentrations of 25%(v/v). Throughout the experiment of 8 week, the rats were allowed free access to water and standard chow. Sample group were administrated by Injinsaryung-san extract daily for 8 weeks. Results : The levels of hepatic marker such as aspartate aminotransferase and alanine aminotransferase were altered. Histopathological changes were reduced and the expression of tumor necrosis $factor-{\alpha}$ ($TNF-{\alpha}$) was markedly attenuated by Injinsaryung-san extract. Conclusion : These data suggest that Injinsaryung-san extract could be effective in protecting the liver from alcoholic fatty liver. The hepatoprotective mechanisms of Injinsaryung-san may be related to attenuation of $TNF-{\alpha}$ protein, as well as to the inhibition of inflammatory response in the liver. Therefore, Injinsaryung-san can be a candidate to protect against alcoholic fatty liver.
Pharmacological effects of Panax ginseng have been demonstrated in cardiovascular system, endocrine secretion and immune system, together with antitumor, anti-stress and anti-oxidant activities. Modern scientific data show protective effect of ginseng against bone marrow cell death, increased survival rate of experimental animals, recovery of hematopoietic injury, immunopotentiation, reduction of damaged intestinal epithelial cells, inhibition of mutagenesis and effective protection against testicular damages, caused by radiation exposure. And also, ginseng acts in indirect fashion to protect radical processes by inhibition of initiation of free radical processes and thus reduces the radiation damages. The research has made much progress, but still insufficient to fully uncover the action mechanism of ginseng components on the molecule level. This review provides the usefulness of natural product, showing no toxic effects, as an radioprotective agent. Furthermore, the further clinical trials on radioprotection of ginseng need to be highly done to clarify its scientific application. The effective components of ginseng has been known as ginsenosides. Considering that each of these ginsenosides has pharmacological effect, it seems likely that non-saponin components might have radioprotective effects superior to those of ginsenosides, suggesting its active ingredients to be non-saponin series. These results also show that the combined effects of saponin and non-saponin components play an important role in the radioprotective effects of ginseng.
Ginsenosides are among the most well-known traditional herbal medicines frequently used for the treatment of various symptoms in South Korea. The neuroprotective effects of ginsenoside $Rg_3$ (G-$Rg_3$) on cholesterol-oxide-(CO)-induced neurotoxicity were investigated through the analyses of rat brains. The recently accumulated reports show that ginseng saponins (GTS), the major active ingredients of Panax ginseng, have protective effects against neurotoxin insults. In the present study, the neuroprotective effects of G-$Rg_3$ on CO-induced hippocampal excitotoxicity were examined in vivo. The in-vitro studies using rat cultured hippocampal neurons revealed that G-$Rg_3$ treatment significantly inhibited CO-induced hippocampal cell death. G-$Rg_3$ treatment not only significantly reduced CO-induced DNA damage but also attenuated CO-induced apoptosis. The in-vivo studies that were conducted revealed that the intracerebroventricular (i.c.v.) pre-administration of G-$Rg_3$ significantly reduced i.c.v. CO-induced hippocampal damage in rats. To examine the mechanisms underlying the in-vitro and in-vivo neuroprotective effects of G-$Rg_3$ against CO-induced hippocampal excitotoxicity, the effect of G-$Rg_3$ on the CO-induced elevations of the apoptotic cells in cultured hippocampal cells was examined, and it was found that G-$Rg_3$ treatment inhibited CO-induced apoptosis. The histopathological evaluation demonstrated that G-$Rg_3$ significantly diminished the apoptosis in the hippocampus and also spared the hippocampal CA1, CA3, and dentate gyrus neurons. G-$Rg_3$ also significantly improved the CO-caused behavioral impairment. G-$Rg_3$ itself had no effect, however, on the CO-induced inhibition of succinate dehydrogenase activity (data not shown). These results collectively indicate the G-$Rg_3$-induced neuroprotection against CO in rat hippocampus. With regard to the wide use of G-$Rg_3$, this agent is potentially beneficial in treating CO-induced brain injury.
Kim, So-Yeon;Yang, Ji-Eun;Song, Jae-Hee;Maeng, Sang-Hyun;Lee, Ji-Hyun;Yoon, Na-Young
Korean Journal of Fisheries and Aquatic Sciences
/
v.51
no.2
/
pp.127-134
/
2018
Arteriosclerosis is the major cause of coronary artery and cerebrovascular disease, which are leading causes of death. Pro-inflammatory cytokines induce injury to vascular endothelial cells by increasing cell adhesion molecules, leading to vascular inflammation, a major risk factor for the development of arteriosclerosis. In the current study, we investigated the inhibitory effect of enzymatic hydrolysate from Japanese mud shrimp Upogebia major on the inflammation of tumor necrosis $factor-{\alpha}$ ($TNF-{\alpha}$)-stimulated human umbilical vein endothelial cells (HUVECs). We first evaluated the antioxidant and angiotensin I-converting enzyme (ACE) inhibitory activities of eight U. major enzymatic hydrolysates: alcalase, papain, ${\alpha}$-chymotrypsin (${\alpha}-Chy$), trypsin, pepsin, neutrase, protamex and flavourzyme. Of these, ${\alpha}-Chy$ exhibited potent antioxidant and ACE inhibitory activities. The ${\alpha}-Chy$ hydrolysate was fractionated by two ultrafiltration membranes of 3 and 10 kDa. The ${\alpha}-Chy$ hydrolysate of U. major and its molecular weight cut-off fractions resulted in a significant reduction in NO production and a decrease in cell adhesion molecules [vascular cell adhesion molecule-1 (VCAM-1), intercellular adhesion molecule-1 (ICAM-1) and endothelial-selectin (E-selectin)] and pro-inflammatory cytokines [interleukin-6 (IL-6), interleukin-8 (IL-8) and monocyte chemoattractant protein-1 (MCP-1)] in $TNF-{\alpha}$-stimulated HUVECs. These results suggest that enzymatic hydrolysate from U. major can be used in the control and prevention of vascular inflammation and arteriosclerosis.
Pruritus (itching) is classically defined as an unpleasant cutaneous sensation that leads to scratching behavior. Although the scientific criteria of classification for pruritic diseases are not clear, it can be divided as acute or chronic by duration of symptoms. In this study, we investigated whether skin injury caused by chemical (contact hypersensitivity, CHS) or physical (skin-scratching stimulation, SSS) stimuli causes initial pruritus and analyzed gene expression profiles systemically to determine how changes in skin gene expression in the affected area are related to itching. In both CHS and SSS, we ranked the Gene Ontology Biological Process terms that are generally associated with changes. The factors associated with upregulation were keratinization, inflammatory response and neutrophil chemotaxis. The Kyoto Encyclopedia of Genes and Genomes pathway shows the difference of immune system, cell growth and death, signaling molecules and interactions, and signal transduction pathways. Il1a, Il1b and Il22 were upregulated in the CHS, and Tnf, Tnfrsf1b, Il1b, Il1r1 and Il6 were upregulated in the SSS. Trpc1 channel genes were observed in representative itching-related candidate genes. By comparing and analyzing RNA-sequencing data obtained from the skin tissue of each animal model in these characteristic stages, it is possible to find useful diagnostic markers for the treatment of itching, to diagnose itching causes and to apply customized treatment.
Kim, Je-Hyeong;Yoon, Dae Wui;Hur, Gyu Young;Jung, Ki Hwan;Lee, Sung Yong;Lee, Sang Yeub;Shin, Chol;Shim, Jae Jeong;In, Kwang Ho;Yoo, Se Hwa;Kang, Kyung Ho
Tuberculosis and Respiratory Diseases
/
v.60
no.4
/
pp.451-463
/
2006
Background : Reactive oxygen species (ROS) take center stage as executers in ventilator-induced lung injury (VILI). The protein with DNA-damage scanning activity, poly (ADP-ribose) polymerase-1 (PARP1), signals DNA rupture and participates in base-excision repair. Paradoxically,overactivation of PARP1 in response to massive genotoxic injury such as ROS can induce cell death through ${\beta}$ -nicotinamide adenine dinucleotide ($NAD^+$) depletion, resulting in inflammation. The purpose of this study is to investigate the role of PARP1 and the effect of its inhibitor in VILI. Methods : Forty-eight male C57BL/6 mice were divided into sham, lung protective ventilation(LPV), VILI, and PARP1 inhibitor (PJ34)+VILI (PJ34+VILI) groups. Mechanical ventilator setting for the LPV group was $PIP\;15cmH_2O$ + $PEEP\;3cmH_2O$ + RR 90/min + 2 hours. The VILI and PJ34+VILI groups were ventilated on a setting of $PIP\;40cmH_2O$ + $PEEP\;0cmH_2O$ + RR 90/min + 2 hours. As a PARP1 inhibitor for the PJ34+VILI group, 20 mg/Kg of PJ34 was treated intraperitoneally 2 hours before mechanical ventilation. Wet-to-dry weight ratio and acute lung injury (ALI) score were measured to determine the degree of VILI. PARP1 activity was evaluated by using an immunohistochemical method utilizing biotinylated NAD. Myeloperoxidase (MPO) activity and the concentration of inflammatory cytokines such as tumor necrosis factor $(TNF)-{\alpha}$, interleukin $(IL)-1{\beta}$, and IL-6 were measured in bronchoalveolar lavage fluid (BALF). Results : In the PJ34+VILI group, PJ34 pretreatment significantly reduced the degree of lung injury, compared with the VILI group (p<0.05). The number of cells expressing PARP1 activity was significantly increased in the VILI group, but significantly decreased in the PJ34+VILI group (p=0.001). In BALF, MPO activity, $TNF-{\alpha}$, $IL-1{\beta}$, and IL-6 were also significantly lower in the PJ34+VILI group (all, p<0.05). Conclusion : PARP1 overactivation plays a major role in the mechanism of VILI. PARP1 inhibitor prevents VILI, and decreases MPO activity and inflammatory cytokines.
Background: Bone injury is common in many clinical situations, such as surgery or trauma. During surgery, excessive reactive oxygen species (ROS) production decreases the quality and quantity of osteoblasts. Remifentanil decreases ROS production, reducing oxidative stress and the inflammatory response. We investigated remifentanil's protective effects against $H_2O_2$-induced oxidative stress in osteoblasts. Methods: To investigate the effect of remifentanil on human fetal osteoblast (hFOB) cells, the cells were incubated with 1 ng/ml of remifentanil for 2 h before exposure to $H_2O_2$. For induction of oxidative stress, hFOB cells were then treated with $200{\mu}M$$H_2O_2$ for 2 h. To evaluate the effect on autophagy, a separate group of cells were incubated with 1 mM 3-methyladenine (3-MA) before treatment with remifentanil and $H_2O_2$. Cell viability and apoptotic cell death were determined via MTT assay and Hoechst staining, respectively. Mineralized matrix formation was visualized using alizarin red S staining. Western blot analysis was used to determine the expression levels of bone-related genes. Results: Cell viability and mineralized matrix formation increased on remifentanil pretreatment before exposure to $H_2O_2$-induced oxidative stress. As determined via western blot analysis, remifentanil pretreatment increased the expression of bone-related genes (Col I, BMP-2, osterix, and $TGF-{\beta}$). However, pretreatment with 3-MA before exposure to remifentanil and $H_2O_2$ inhibited remifentanil's protective effects on hFOB cells during oxidative stress. Conclusions: We showed that remifentanil prevents oxidative damage in hFOB cells via a mechanism that may be highly related to autophagy. Further clinical studies are required to investigate its potential as a therapeutic agent.
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