Biomedical subjects

Ho-Jeong Na

Publications and source records attributed to Ho-Jeong Na.

17 recordsLinked to original sources

PubMed2005

Regulatory effect of atopic allergic reaction by Carpopeltis affinis.

Carpopeltis affinis Okamura (CA, Halymeniaceae) has long been used as therapeutics for various allergic diseases in Korea. The precise effects of CA in experimental models, however, have remained unknown. We studied the effects of a methanol extract of CA on atopic allergic reaction. Histamine content was measured by the o-phthalaldehyde spectrofluorometric procedure. Cytokines were measured by a modified enzyme-linked immunosorbent assay. Cytotoxicity was determined by the 3-(4,5-dimethythiazol-2-yl)-2,5-diphenyl-tetrazolium bromide (MTT) assay. CA significantly inhibited the histamine release and beta-hexosaminidase release from rat peritoneal mast cells. CA also inhibited interleukin-8 and tumor necrosis factor-alpha secretion from the phorbol 12-myristate 13-acetate and A23187-induced HMC-1 cells (human mast cell line). 48 h exposure to CA (1.0, 10, and 100 microg/ml) had little effect on HMC-1 cell viability. Our results suggest that CA has an inhibitory effect on mast cell-dependent allergic reaction and thus may be useful in the treatment of atopic dermatitis.

Animals↗

PubMed2005

Sargassum hemiphyllum inhibits atopic allergic reaction via the regulation of inflammatory mediators.

Sargassum hemiphyllum (SH) has long been used in Korean folk medicine for the therapeutic treatment of various allergic diseases. The effects of SH in previous experimental models, however, have been inconclusive. We studied the effects of methanol extract of SH on mast cells. Our experiments showed that SH significantly inhibited compound 48/80-induced histamine and beta-hexosaminidase release from rat peritoneal mast cells. SH inhibited interleukin (IL)-8 and tumor necrosis factor (TNF)-alpha release induced by phorbol 12-myristate 13-acetate and A23187 from HMC-1, and it also showed an inhibitory effect on the anti-dinitrophenyl IgE antibody-induced passive cutaneous anaphylaxis reaction. In addition, SH inhibited the increase of TNF-alpha-induced NF-kappaB protein levels, transcription factor of TNF-alpha from 293T cells. A period of 48 h exposure to SH had little effect on HMC-1 cell viability. Our results suggest that SH has an inhibitory effect on the atopic allergic reaction and thus this may be useful in the treatment of allergic inflammatory diseases, such as atopic dermatitis.

Animals↗

PubMed2005

The immunosuppressive effect of Gamisanghyulyunbueum through inhibition of mitogen-activated protein kinase and nuclear factor activation in MOLT-4 cells.

Gamisanghyulyunbueum (GSHYBE) has been used clinically to treat skin related disease in South Korea. We investigated GSHYBE-mediated changes in downstream T cell signal transduction. To determine the mechanism of inhibition, we have studied many of the major pathways in phytohemagglutinin (PHA)-activated T cell. We show that among the mitogen-activated protein kinase family activation of phosphorylation of extra cellular signal-regulated kinase 1/2 (ERK1/2, p44/42) and p38, but not c-jun NH2-terminal kinase is inhibited. In activated MOLT-4 cells, the nuclear localization of nuclear factor of activated T cells (NFATc) was blocked by GSHYBE (1 mg/ml). Also, degradation of inhibitor kappaB-alpha and transactivation by nuclear factor-kappaB (NF-kappaB)/Rel A were impaired by GSHYBE (1 mg/ml). Furthermore, interlukin (IL)-2, IL-4 and Interferen (IFN)-gamma secretion by PHA activated MOLT-4 cells and peripheral blood mononuclear cells (PBMC) were significantly diminishes following GSHYBE treatment (1 mg/ml). Also, oral administration of GSHYBE inhibited IL-2 secretion in skin allergic reaction. In conclusion, our data indicate that GSHYBE treatment of T cells inhibits ERK1/2 and p38 activation and nuclear translocation of NFATc, NF-kappaB, resulting in diminished secretion of IL-2.

Adult↗

PubMed2004

Regulatory effects of cytokine production in atopic allergic reaction by gammi-danguieumja.

Gammi-danguieumja (GD) is clinically used in South Korea for treating atopic dermatitis. However, its effects in experimental models remain unknown. We investigated a possible effect of GD on cytokines production using human T cell line (MOLT-4) or human mast cell line. As a result, GD (0.01 mg/mL)-containing medium in stimulated culture supernatants increased IL-2 and IFN-gamma, and decreased IL-4 secretion in MOLT-4. GD (0.01-1 mg/mL)-containing medium in stimulated culture supernatants dose-dependently and significantly decreased IL-8, IL-13, and tumor necrosis factor-alpha secretion on the phorbol 12-myristate 13-acetate and A23187-stimulated HMC-1. In addition, GD inhibited histamine release from activated mast cells. These results suggest that GD contributes to the regulation of atopic allergic reactions.

Animals↗

PubMed2004

Paeonol inhibits anaphylactic reaction by regulating histamine and TNF-alpha.

Paeonol, a major phenolic component of Moutan Cortex, was known to have antiaggregatory, antioxidant and antiinflammatory activities. In the present study, we tried to elucidate the effects of paeonol on anaphylactic reaction and its mode of action. Paeonol significantly inhibited histamine release from the rat peritoneal mast cells (RPMCs) treated with compound 48/80, a mast cell degranulator. The release of tumor necrosis factor (TNF)-alpha mast cell activating cytokine was significantly suppressed in RBL-2H3 mast cells pretreated with anti-dinitrophenyl (DNP) immunoglobulin E (IgE) in a dose-dependent manner. Paeonol significantly inhibited IgE production in B cells activated by anti-CD40 mAb, recombinant interleukin-4 (rIL-4) and recombinant histamine releasing factor (rHRF). Paeonol effectively downregulated the expression of IL-4 in the activated B cells by reverse transcription-polymerase chain reaction (RT-PCR). We also confirmed that paeonol effectively inhibited anaphylactic shock in mice by 90% at a dose of 0.5 mg/mouse versus PBS treated control 2 h after the i.p. injection of compound 48/80. These results suggest that paeonol has antianaphylatic activity by regulating histamine and TNF-alpha.

Acetophenones↗

PubMed2004

Inhibition of mast cell-dependent immediate-type hypersensitivity reactions by purple bamboo salt.

Purple bamboo salt is a specially processed salt according to the traditional recipe using normal salt and bamboo etc. It has been used as a folk medicine for the purpose of prevention and treatment of various diseases in Korea. This report describes an inhibitory effect of purple bamboo salt on mast cell-mediated immediate-type allergic reactions. Purple bamboo salt (0.01-1 microg per site) significantly inhibited the ear swelling response induced by intradermal injection of compound 48/80 in mice. Purple bamboo salt (0.01-1 mg/ml) dose-dependently inhibited the histamine release from the rat peritoneal mast cells (RPMCs) by compound 48/80. Purple bamboo salt (0.01-1 g/kg) also dose-dependently inhibited the passive cutaneous anaphylaxis (PCA) by oral administration. Our results provide evidence that purple bamboo salt will be beneficial in the regulation of immediate-type of allergic reactions.

Animals↗

PubMed2004

Decrease of immobility behavior in forced-swimming test and immune system enhancing effect of traditional medicine Gamisipjundaebo-tang.

Gamisipjundaebo-tang (GSDBT) has been used for the purpose of development of physical strength. In the present study, we investigated the immune enhancing effect induced by GSDBT. We investigated the anti-immobility effect of GSDBT via a forced-swimming test and blood biochemical parameters related to fatigue, glucose, blood urea nitrogen, lactic dehydrogenase, creatine kinase, and total protein. GSDBT (0.1 and 1 g/kg) was orally administered to mice for 14 days. After 7 and 14 days, as assessed through a forced-swimming test, immobility time was decreased in the GSDBT-administrated group (0.1 and 1 g/kg) in comparison with the control group. In addition, after 8 days, the contents of glucose and lactate dehydrogenase in the blood serum were increased, and contents of blood urea nitrogen were decreased in the GSDBT-administrated group. After 15 days, the contents of glucose were increased, and the contents of lactate dehydrogenase and blood urea nitrogen were decreased in the GSDBT-administrated group. However, it had no effect on the elevation of creatine kinase and total protein level. We also investigated the effect of GSDBT on the production of cytokines in human T-cell line, MOLT-4 cells, and splenocytes. GSDBT significantly increased interferon (IFN)-gamma and interleukin (IL)-2 levels compared with the media control but did not affect IL-4. GSDBT increased the protein expression of IFN-gamma in MOLT-4 cells. These results suggest that GSDBT may be useful in immune function improvement and may also have antifatigue properties.

Animals↗

PubMed2004

Inhibitory effect of Yunbutang on mast cell-dependent allergic reactions.

Yunbutang (YB) is an Oriental herbal prescription, which has been successfully applied for the treatment of allergic disorders, mainly atopic dermatitis in clinical medicine. However, its effect in experimental models remains unknown. Here, we report inhibitory effects of YB on mast cell-dependent immediate-type allergic reactions. YB inhibited systemic allergic reaction induced by compound 48/80. YB dose-dependently inhibited the histamine release from the mast cells activated by compound 48/80. YB also showed an inhibitory effect of anti-dinitrophenyl IgE antibody-induced passive cutaneous anaphylaxis reaction by oral administration. Furthermore, YB inhibited tumor necrosis factor-alpha secretion from stimulated mast cells. These findings provide evidence that YB inhibits the mast cell-dependent allergic reactions.

Animals↗

PubMed2004

Molecular discrimination of medicinal Astragali radix by RAPD analysis.

The randomly amplified polymorphic DNA (RAPD) analysis has been applied for estimating genetic diversity in plant populations or cultivars. To discriminate geographical origin among Astragali radix populations, RAPD analysis was carried out using 20 mer-random primers. The similarity coefficient between the DNA of Astragali radix plants analyzed was 0.527. Although the coefficients of similarity were high, primer 7, 8 and 10 gave distinguishable bands between Korean and Chinese Astragali radix. We obtained the specific RAPD markers to discriminate between Korean and Chinese Astragali radix at a DNA level. These results suggest that this method is able to discriminate the concerned Astragali radix geographical origin species. Also, this is the first report on the genetic diversity in geographical origin among Astragali radix populations using RAPD analysis. Broader application of this approach to authenticate other morphologically similar medicinal materials is rationalized.

Astragalus propinquus↗

PubMed2004

Effect of Boo Yong-Tang on mast cell-mediated allergic reaction.

Boo Yong-Tang (BYT) is an Oriental herbal prescription, which has been clinically applied for treatment of allergic disorders. Here, we report inhibitory effects of BYT on experimental allergic reactions. BYT increased interferon-gamma secretion from MOLT-4 T cells. When BYT (0.01, 0.1, or 1 g/kg) was orally administered for 1 h in mice, compound 48/80-induced ear swelling was significantly reduced. BYT also inhibited the histamine release from the mast cells activated by compound 48/80. In addition, BYT showed an inhibitory effect of anti-dinitrophenyl IgE antibody-induced passive cutaneous anaphylaxis reaction. These findings provide evidence that BYT is a potential prescription for the treatment of allergic reaction through down-modulating of mast cell activation.

Animals↗

PubMed2004

Rubus croceacanthus Leveille inhibits mast cell-mediated anaphylactic-like reaction and tumor necrosis factor-alpha secretion.

This work aims at examining the effect of the concentrated methanol extract of Rubus croceacanthus Leveille (RCL) on mast cell-mediated anaphylactic-like reaction in a murine model. RCL inhibited compound 48/80-induced systemic anaphylactic-like reaction. When RCL was given as pre-treatment at concentrations ranging from 0.01 to 1 mg/ml, the histamine release from rat peritoneal mast cells induced by compound 48/80 or anti-dinitrophenyl (DNP) immunoglobulin E (IgE) was reduced in a dose-dependent manner. RCL also inhibited passive cutaneous anaphylaxis activated by anti-DNP IgE. In addition, RCL inhibited phorbol 12-myristate 13-acetate and A23187-induced tumor necrosis factor-alpha secretion from human mast cell line HMC-1 cells. These results indicate that RCL may possess a strong anti-anaphylactic activity.

Anaphylaxis↗

PubMed2003

Effect of Poncirus fructus on stem cell factor-induced mast cell migration.

Mast cell hyperplasia can be causally related with chronic inflammation. Stem cell factor (SCF), the ligand of the c-kit protooncogene product, is a major regulator and chemoattractant of mast cells. Poncirus fructus (PF) has been used against allergic diseases for generations in South Korea. PF (1 mg ml(-1)) significantly inhibited the SCF-induced migration of rat peritoneal mast cells (RPMCs). RPMCs exposed to SCF (50 ng ml(-1)) resulted in a drastic shape change with a polarized morphology while the cells exposed to PF (1 mg ml(-1)) remained resting, with little or no shape alteration. The drastic morphological alteration and distribution of polymerized actin were blocked by pretreatment with PF. In addition, PF inhibited both TNF-alpha and IL-6 secretion from RPMCs stimulated with SCF. Our findings provide evidence that PF inhibits chemotactic response and inflammatory cytokines secretion to SCF in mast cells.

Actins↗

PubMed2003

Forsythia fructus inhibits the mast-cell-mediated allergic inflammatory reactions.

Mast cells are key as effector cells in the early phase allergic inflammation and in diverse immunological and pathological processes. Forsythia fructus (F. fructus) has used as a traditional medicine for inflammatory diseases. In the present study, we determined the effect of F. fructus extracts on compound 48/80-induced paw oedema and vascular permeability in vivo. In addition, we investigated in vitro whether F. fructus has inhibitory effects on compound 48/80-induced histamine releases from rat peritoneal mast cells (RPMC), and on phorbol 12-myristate 13-acetate (PMA) plus A23187-induced tumor necrosis factor-alpha (TNF-alpha) releases from human mast cells (HMC-1). In mice orally administrered F. fructus (100 microg/g) for 1 h, compound-48/80-induced oedema and vascular permeability were significantly reduced rather than those receiving intravenous injection of ketotifen, mast cell stabilizer. F. fructus dose-dependently inhibited the histamine release induced by compound 48/80 from RPMCs. Moreover, F. fructus had no cytotoxic effects on cell viability and had inhibitory effects on TNF-alpha secretion from HMC-1. These results suggest that F. fructus is a potential herb medicine for treatment of inflammatory diseases through downmodulating mast cell activation.

Animals↗

PubMed2003

Inhibition of the stem cell factor-induced migration of mast cells by dexamethasone.

Mast cell accumulation can be causally related to several allergic inflammations. Previous work has demonstrated that glucocorticoids decreased tissue mast cell number, and stem cell factor (SCF)-induced migration of mast cells required p38 MAPK activation. In the present study we investigated the effects of dexamethasone on SCF-induced migration of rat peritoneal mast cells (RPMCs). SCF significantly induced the migration of RPMCs at 4 h. Dexamethasone dose-dependently inhibited SCF-induced migration of RPMCs (approximately 90.1% at 100 nM; P < 0.05). The MAPK p38 inhibitor SB203580 (20 microM) also inhibited the SCF-induced migration. The ability of SCF to enhance morphological alteration and filamentous actin formation was also abolished by treatment with dexamethasone. Dexamethasone inhibited SCF-induced p38 MAPK activation to near-basal levels and induced MAPK phosphatase-1 expression. In addition, SCF-induced inflammatory cytokine production was significantly inhibited by treatment with dexamethasone or SB203580 (P < 0.01). Our results show that dexamethasone potently regulates SCF-induced migration, p38 MAPK activation, and inflammatory cytokine production through the expression of MKP-1 protein in RPMCs. Such modulation may have functional consequences during dexamethasone treatment, especially mast cell-mediated allergic inflammation disorders.

Actins↗

PubMed2002

Inhibition of TNF-alpha and IL-6 production by Aucubin through blockade of NF-kappaB activation RBL-2H3 mast cells.

Antigen (Ag)-stimulated mast cells induce synthesis and production of cytokines including tumor necrosis factor (TNF)-alpha and interleukin (IL)-6 with proinflammatory and immune regulatory properties. Expression of TNF-alpha and IL-6 was regulated by a transcription factor, nuclear factor (NF)-kappaB. The iridoid glycoside, aucubin, has been found as a natural constituent of many traditional oriental medicinal plants. We studied the effect of aucubin on the TNF-alpha and IL-6 expression in Ag-stimulated rat basophilic leukemia (RBL)-2H3 mast cells. We show that aucubin inhibited Ag-induced TNF-alpha and IL-6 production and expression in a dose-dependent manner with IC(50) of 0.101 and 0.19 microg/ml, respectively. Maximal inhibition of TNF-alpha and IL-6 production was 73 +/- 4.3% and 88.8 +/- 5%, respectively. Aucubin also inhibited Ag-induced nuclear translocation of p65 subunit of NF-kappaB and degradation of IkappaBalpha. Inhibition of NF-kappaB activation by aucubin might be specific since activator protein-1 binding activity was not affected. In conclusion, these results suggest that aucubin is a specific inhibitor of NF-kappaB activation in mast cells, which might explain its beneficial effect in the treatment of chronic allergic inflammatory diseases.

Animals↗

PubMed2002

Tongkyutang inhibits mast cell-dependent allergic reactions and inflammatory cytokines secretion.

BACKGROUND: Tongkyutang (TKT) is an Oriental herbal prescription, which has been successfully applied for the treatment of allergic disorders, mainly allergic-rhinitis in clinical medicine. However, its effect in experimental models remains unknown. METHODS: In a mouse model, the role of TKT was examined in mast cell-dependent allergic reactions and secretion of inflammatory cytokines. RESULTS: TKT concentration-dependently inhibited the ear-swelling response induced by intradermal injection of compound 48/80. TKT inhibited the compound 48/80-induced degranulation from mast cells in ear tissue. TKT dose-dependently inhibited the histamine release from the rat peritoneal mast cells by compound 48/80. TKT also showed inhibition of anti-dinitrophenyl IgE antibody-induced passive cutaneous anaphylaxis reaction by oral administration. Furthermore, TKT inhibited both IL-1beta and TNF-alpha secretion induced by PMA and A23187, respectively. CONCLUSIONS: Our findings provide evidence that TKT inhibits the mast cell-dependent allergic reactions and inflammatory cytokines secretion.

Anaphylaxis↗

PubMed2002

CancerB increases production of nitric oxide and tumor necrosis factor-alpha in peritoneal macrophages.

BACKGROUND: CancerB (CCB, IMSF-5), herbal combination, may be able to stimulate potential toxic mediators such as nitric oxide (NO) and tumor necrosis factor-alpha (TNF-alpha) in isolated mouse peritoneal macrophages. METHODS: NO production was determined by Griess method, and TNF-alpha production by enzyme-linked immunosorbent assay. Amounts of proteins were observed by Western blotting. RESULTS: CCB had no effect on NO production by itself, but CCB alone did stimulate the production of TNF-alpha. When CCB was used in combination with recombinant interferon-gamma (rIFN-gamma), there was a marked cooperative induction of NO production, TNF-alpha production and NF-kappa B activation. The increase in NO synthesis was reflected as an increased amount of inducible NO synthase protein. The increased production of NO from rIFN-gamma plus CCB-stimulated peritoneal macrophages was decreased by the treatment with N(G)-monomethyl-L-arginine or N(alpha)-Tosyl-Phe Chloromethyl Ketone. Nuclear factor-kappa B (NF-kappa B) inhibitor, pyrrolidine dithiocarbamate was able to completely inhibit the production of NO and TNF-alpha. CONCLUSIONS: These findings demonstrate that CCB increases the production of NO and TNF-alpha by rIFN-gamma-primed peritoneal macrophages and suggest that NF-kappa B plays a critical role in mediating these effects of CCB.

Animals↗