• 대한본초학회지
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• 제22권1호
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• pp.1-6
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• 2007

Objectives : The purpose of this study is that the protective effects of habmayou on acetaminophen (AP)-induced hepatotoxicity were investigated in mice. Methods : Before administering AP mice supplied with only water were left alone for 18 hours. after concentration and dissolution in poly ethylglycol AP 400mg per 1kg of mouse weight, we injected AP titrated density with a physiological saline solution into the abdominal cavity of mouse to induce hepatotoxicity. we researched mortality rate and the shape of liver tissue of mouse. Results : Treatment with habmayou (250 mg/kg, p.o.) 0.5 h after AP administration significantly prevented an increase in plasma alanine aminotransferase and aspartate aminotransferase activities and AP-induced hepatic necrosis, and also reduced AP-induced mortality from 46% to 0%. In addition, oral treatment with habmayou significantly prevented AP-induced depletion of glutathione (GSH) contents. However, habmayou treatment, by itself, did not affect hepatic GSH contents. Conclusion : These results show that the hepatoprotective effects of habmayou against AP overdose may be due to its ability to block the bioactivation of AP by regeneration of hepatonecrotic cells.

• 센서학회지
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• 제26권2호
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• pp.96-100
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• 2017

Poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) has been extensively studied as the active material in ammonia gas sensor because of its fast response time, high conductivity and environmental stability. It is well known that a post annealing process for organic devices based on PEDOT:PSS significantly increases the device performance. In this study, we propose the solvent annealing of PEDOT:PSS and investigated its effects. As a results, post solvent annealing on PEDOT:PSS lead to the surface chemical and physical properties change. These changes result in improved conductivity of the PEDOT:PSS. In additional, ammonia sensitivity of solvent annealed PEDOT:PSS become higher than pristine polymer film. The enhancement is mainly caused by the depletion of gas barrier PSS and structural re-forming PEDOT networks. We believe that the post solvent annealing is a promising method to achieve highly sensitivity PEDOT:PSS films for applications in efficient, low-cost and flexible ammonia gas sensor.

• Journal of Ginseng Research
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• 제46권5호
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• pp.636-645
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• 2022

Background: Ginsenoside Rg3 and gemcitabine have mutual enhancing antitumor effects. However, the underlying mechanisms are not clear. This study explored the influence of ginsenoside Rg3 on Zinc finger protein 91 homolog (ZFP91) expression in pancreatic adenocarcinoma (PAAD) and their regulatory mechanisms on gemcitabine sensitivity. Methods: RNA-seq and survival data from The Cancer Genome Atlas (TCGA)-PAAD and Genotype-Tissue Expression (GTEx) were used for in-silicon analysis. PANC-1, BxPC-3, and PANC-1 gemcitabine-resistant (PANC-1/GR) cells were used for in vitro analysis. PANC-1 derived tumor xenograft nude mice model was used to assess the influence of ginsenoside Rg3 and ZFP91 on tumor growth in vivo. Results: Ginsenoside Rg3 reduced ZFP91 expression in PAAD cells in a dose-dependent manner. ZFP91 upregulation was associated with significantly shorter survival of patients with PAAD. ZFP91 overexpression induced gemcitabine resistance, which was partly conquered by ginsenoside Rg3 treatment. ZFP91 depletion sensitized PANC-1/GR cells to gemcitabine treatment. ZFP91 interacted with Testis-Specific Y-Encoded-Like Protein 2 (TSPYL2), induced its poly-ubiquitination, and promoted proteasomal degradation. Ginsenoside Rg3 treatment weakened ZFP91-induced TSPYL2 poly-ubiquitination and degradation. Enforced TSPYL2 expression increased gemcitabine sensitivity of PAAD cells and partly reversed induced gemcitabine resistance in PANC-1/GR cells. Conclusion: Ginsenoside Rg3 can increase gemcitabine sensitivity of pancreatic adenocarcinoma at least via reducing ZFP91 mediated TSPYL2 destabilization.

• 동의생리병리학회지
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• 제16권3호
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• pp.521-527
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• 2002

The Caesalpinia sappan is widely used in the traditional oriental herbal medicine for anti-inflammatory, antioxidant effects. The effects of water extract of C. sappan on the cell viability and induction of apoptosis were investigated in human lung cancer cell line A549. The water extract of C. sappan produced apoptotic cell death and DNA fragmentation and nucleus chromatin condensation in A549 cells. The enzyme activity of caspase-3 and protein level of actived caspase-3 were markedly increased in A549 cells treated with the water extract of C. sappan. In addition, the extract of C. sappan induced cleavage of Poly (ADP-ribose) polymerase (PARP), a known substrate for caspase-3, and dropped in cellular ATP levels. These results suggest that the extract of C. sappan exerts anticancer activity by induction of apoptosis via activation of caspase-3, cleavage of PARP protein, and depletion of cellular ATP levels in A549 cells.

• Journal of Microbiology and Biotechnology
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• 제31권2호
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• pp.304-316
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• 2021

Vaccination is the most effective way to prevent influenza virus infections. However, conventional vaccines based on hemagglutinin (HA) have to be annually updated because the HA of influenza viruses constantly mutates. In this study, we produced a 3M2e-3HA2-NP chimeric protein as a vaccine antigen candidate using an Escherichia coli expression system. The vaccination of chimeric protein (15 ㎍) conferred complete protection against A/Puerto Rico/8/1934 (H1N1; PR8) in mice. It strongly induced influenza virus-specific antibody responses, cytotoxic T lymphocyte activity, and antibody-dependent cellular cytotoxicity. To spare the dose and enhance the cross-reactivity of the chimeric, we used a complex of poly-γ-glutamic acid and alum (PGA/alum) as an adjuvant. PGA/alum-adjuvanted, low-dose chimeric protein (1 or 5 ㎍) exhibited higher cross-protective effects against influenza A viruses (PR8, CA04, and H3N2) compared with those of chimeric alone or alum-adjuvanted proteins in vaccinated mice. Moreover, the depletion of CD4+ T, CD8+ T, and NK cells reduced the survival rate and efficacy of the PGA/alum-adjuvanted chimeric protein. Collectively, the vaccination of PGA/alum-adjuvanted chimeric protein induced strong protection efficacy against homologous and heterologous influenza viruses in mice, which suggests that it may be a promising universal influenza vaccine candidate.