Lagerstroemia speciosa extract inhibit TNF-induced activation of nuclear factor-kappaB in rat cardiomyocyte H9c2 cells.

AIM OF THE STUDY: Lagerstroemia speciosa has been used as a folk medicine among people with diabetes in the Philippines. It is known to exhibit antidiabetic, antiobesity, and glucose transport activities through mechanisms not well defined. Diabetes leads to cardiomyocyte hypertrophy in association with an upregulation of vasoactive factors and activation of nuclear factor (NF)-kappaB and activating protein-1. We therefore investigated the effect of Lagerstroemia speciosa on the activation of NF-kappaB as a key mediator of cardiomyocyte hypertrophy, in rat cardiomyocyte H9c2 cells. MATERIALS AND METHODS: Water extract of Lagerstroemia speciosa (Lythraceae family) was prepared. H9c2 cells were used for treatment of Lagerstroemia speciosa extract with/without tumor necrosis factor (TNF). To examine NF-kappaB's activation, we performed an electrophoretic mobility shift assay (EMSA). RESULTS: The activation of NF-kappaB by TNF was completely blocked by a Lagerstroemia speciosa extract in a dose- and time-dependent manner in H9c2 cells. CONCLUSION: Overall, our results indicate that Lagerstroemia speciosa can inhibit DNA-binding of NF-kappaB. This may explain its possible inhibition of diabetes-induced cardiomyocyte hypertrophy.

Asthma-related environmental fungus, Alternaria, activates dendritic cells and produces potent Th2 adjuvant activity.

Asthma is thought to result from dysregulated Th2-like airway inflammatory responses to the environment. Although the etiology of asthma is not fully understood in humans, clinical and epidemiological evidence suggest a potential link between exposure to environmental fungi, such as Alternaria, and development and/or exacerbation of asthma. The goal of this project was to investigate the mechanisms of airway Th2 responses by using Alternaria as a clinically relevant model for environmental exposure. Airway exposure of naive animals to an experimental Ag, OVA, or a common allergen, short ragweed pollen, induced no or minimal immune responses to these Ags. In contrast, mice developed strong Th2-like immune responses when they were exposed to these Ags in the presence of Alternaria extract. Extracts of other fungi, such as Aspergillus and Candida, showed similar Th2 adjuvant effects, albeit not as potently. Alternaria stimulated bone marrow-derived dendritic cells (DCs) to express MHC class II and costimulatory molecules, including OX40 ligand, in vitro. Importantly, Alternaria inhibited IL-12 production by activated DCs, and DCs exposed to Alternaria enhanced Th2 polarization of CD4(+) T cells. Furthermore, adoptive airway transfer of DCs, which had been pulsed with OVA in the presence of Alternaria, showed that the recipient mice had enhanced IgE Ab production and Th2-like airway responses to OVA. Thus, the asthma-related environmental fungus Alternaria produces potent Th2-like adjuvant effects in the airways. Such immunogenic properties of certain environmental fungi may explain their strong relationships with human asthma and allergic diseases.

Hange-koboku-to, a Kampo medicine, modulates cerebral levels of 5-HT (5-hydroxytryptamine), NA (noradrenaline) and DA (dopamine) in mice.

Cerebral monoamine systems play important pathogenic roles in various psychiatric and neurologic diseases, such as depression, anxiety and swallowing disturbance. Hange-koboku-to, a Kampo (Japanese herbal) medicine, has been successfully used for the treatment of these disorders. To elucidate the mechanisms underlying its clinical efficacy for these disorders, the effects of Hange-koboku-to (500 mg/kg, p.o.) on the cerebral monoamine systems were examined. Regional levels of 5-HT (5-hydroxytryptamine), NA (noradrenaline), DA (dopamine) and their metabolites in mouse brain were measured using a high-performance liquid chromatography system. Hange-koboku-to increased the 5-HT and NA levels and decreased 5-HIAA (5-hydroxyindole-3-acetic acid), thus decreasing 5-HT and NA turnover (metabolites/monoamine ratio) in the hypothalamus. The levels of DA, DOPAC (3,4-dihydroxyphenylacetic acid) and HVA (4-hydroxy-3-methoxy-phenylacetic acid) were all increased, resulting in a decreased DA turnover in the striatum. Since decreased 5-HT turnover has been observed after administration of various antidepressants, Hange-koboku-to-mediated reduction of 5-HT turnover may be related to the clinical efficacy of this Kampo medicine on certain psychiatric disorders. Furthermore, the beneficial therapeutic effects of Hange-koboku-to on swallowing disturbance may be related to the increased cerebral DA level brought about by this Kampo medicine.

Protective effect of hawthorn fruit on murine experimental colitis.

The pathogenic mechanism and effective treatment of inflammatory bowel disease (IBD) are still unknown. In the present study, we examined the protective effect of hawthorn fruit (Crataegifructus) on two murine colitis models: dextran sulfate sodium (DSS) and 2,4,6-trinitrobenzene sulfonic acid (TNBS) colitis. Mice that developed acute colitis showed signs of diarrhea, gross rectal bleeding and weight loss within 10 days. However, hawthorn fruit (2 g/kg body weight) restored the body weight and colon length and increased hemoglobin count in these animals. Hawthorn fruit not only decreased signs of inflammation such as infiltration by polymorphonuclear leukocytes and multiple erosive lesions, but also showed improvement of leukotriene B4 (LTB4), a biochemical parameter of inflammation mass. TNBS colitis mice had significantly lower rates of survival than normal control animals; however, treatment with hawthorn fruit significantly improved survival in TNBS colitis mice. The results suggest that hawthorn fruit and the Kampo formula that contains this ingredient may have potential therapeutic utility in patients with IBD.

Anti-hepatitis C virus effect of citrus unshiu peel and its active ingredient nobiletin.

We investigated the effects of water and ethyl acetate extracts of Citrus unshiu peel (Aurantii Nobilis pericarpium) on hepatitis C virus (HCV) absorption in MOLT-4 cells (a human lymphoblastoid leukemia cell line). By reverse transcription polymerase chain reaction (RT-PCR), we showed that both the ethyl acetate layer of Citrus unshiu peel extract and fraction 7 decreased HCV absorption in MOLT-4 cells. Furthermore, we demonstrated that 3',4',5,6,7,8-hexamethoxyflavone (nobiletin) is the active ingredient that markedly inhibited HCV infection in MOLT-4 cells.

A randomized, double-blind, placebo-controlled clinical trial of the Chinese herbal medicine "ba wei di huang wan" in the treatment of dementia.

OBJECTIVES: To evaluate whether a traditional Chinese herbal medicine, ba wei di huang wan (BDW), improves cognitive and physical functioning in dementia patients. DESIGN: An 8-week randomized, double-blind, placebo-controlled trial. SETTING: Long-term-care facility in Japan. PARTICIPANTS: Thirty-three patients with mild to severe dementia (7 men and 26 women; mean age +/- standard deviation=84.4 +/- 7.8) were recruited and enrolled from May 2002 through September 2002. INTERVENTION: Participants were randomly assigned to the active drug (BDW) group (n=16) or the placebo group (n=17) and treated for 8 weeks. MEASUREMENT: Cognitive function and activities of daily living (ADLs); palsatility index. RESULTS: After the trial, cognitive function as assessed using the Mini-Mental State Examination (MMSE) significantly improved from 13.5 +/- 8.5 to 16.3 +/- 7.7 (P<.01, 95% confidence interval (CI)=-4.1 to -1.4) in the BDW group. The ADL score in the Barthel Index also significantly changed, from 61.8 +/- 34.6 to 78.9 +/- 21.1 (P<.01, 95% CI=-26.2 to -7.9). In contrast, MMSE and Barthel Index scores of the placebo group showed no significant change. Eight weeks after the end of the administration, MMSE and Barthel Index scores of the BDW group declined to the baseline level. The pulsatility index in the internal carotid artery as measured using Doppler sonography significantly decreased in the BDW group (2.5 +/- 1.7 to 1.9 +/- 0.5, P<.05) but not in the placebo group. CONCLUSION: These results argue the benefits of BDW in the treatment of dementia.

Evaluation of immunological effects of hochu-ekki-to (TJ-41) prophylactic administration in mice.

We evaluated the immunological effects of a Kampo (Chinese) prescription Hochuekki-to (TJ-41) for 32 weeks and 1 week prophylactically in mice, The splenic natural killer cells (NK) of C57BL/6N mice prophylactically treated with TJ-41 for 32 weeks showed little enhanced cytotoxicity against NK-sensitive YAC-1 targets, but mice treated for 1 week showed significantly enhanced cytotoxicity. TJ-41 administration for 32 weeks increased the splenic NK cell population and CD4/CD8 significantly, but TJ-41 for 1 week was not affected. Further, there were no adverse effects of TJ-41 administration for 32 weeks. Whether or not that duration of administration can have the same beneficial effects on humans await further studies.

A pharmacologic study on the mechanism of action of Kakkon-to: body temperature elevation and phagocytic activation of macrophages in dogs.

OBJECTIVE: The phagocytic activity of macrophages as a novel approach to scientific elucidation of the effects of Chinese medicines was studied through administration of a kampo preparation, by measuring the rise in body temperature, which is thought to stimulate innate defensive functions of organisms and enhance the immune systems. DESIGN: Using dogs as experimental models, a rise in body temperature following administration of Kakkon-to was observed, and the average number and average rate of phagocytosis of macrophages in blood using latex micro-particles was investigated. RESULTS: The body temperature of the treated animals significantly increased 30 minutes after administration (p<0.01), and remained elevated for more than 5 hours. A comparison of body temperatures before and after administration showed significant increases over controls from 1 to 11 hours, p<0.01; and at 12 hours, p<0.05 after administration. The average number and the average rate of phagocytosis were significantly increased 1 (p<0.05) and 2 (p<0.01) hours after administration. The mean number of phagocytized cells significantly increased (p<0.05) at 1 hour after administration compared with that before administration, and the mean phagocytic rate also increased significantly (p<0.01) 2 hours after administration. Increases (p<0.01) in both the rate of phagocytosis and the number of cells phagocytized were found at every measurement point from 2 to 24 hours after administration. Significant increases (p<0.01) were also observed in both the rate of phagocytosis and the number of cells phagocytized 3 hours after administration, when compared with the control group. CONCLUSION: This paper demonstrates that ingestion of Kakkon-to not only increases the body temperature but also enhances the phagocytic activity of macrophages, an in vivo defense mechanism, suggesting that Kakkon-to contributes to the suppression of multiplication of common cold viruses and influenza viruses, which consequently results in improvement of various symptoms during infection with common cold viruses.

Effects of traditional Chinese medicines on murine bone metabolism in a microgravity environment.

We investigated the effects of three traditional Chinese medicine prescriptions on changes of bone metabolism in mice, using a gravity device to produce a microgravity environment. We found that Hochu-ekki-to (TJ-41) and Hachimi-jio-gan (TJ-7) suppress the increase in the ratio of serum Ca/P and the increase of calcium in urine. Moreover, TJ-41 and Shin-bu-to (TJ-30) reversed the increase of alkaline phosphatase activity (ALP), and TJ-41 also reversed the decrease of estradiol in the serum. The mechanism may be that the traditional Chinese medicines increased estradiol, causing the decrease of ALP, which induced the changes of Ca and P in serum, leading to a decreased excretion of Ca in urine. In this study, TJ-41 was effective in every parameter while TJ-7 and TJ-30 was effective on some parameters, showing that traditional Chinese medicines have specificities in the space environment. In conclusion, this study suggests that some traditional Chinese medicines may be beneficial for adaptation to a space environment.

Effects of hachimi-jio-gan (ba-wei-di-huang-wan) on blood flow in the human central retinal artery.

Hachimi-jio-gan (HJG), a Chinese herbal formula, and a placebo were given to 12 healthy adults, and the changes in blood flow in the central retinal artery were observed with the latest ultrasonic diagnosis device before and after administration. After administration of HJG, the systolic flow velocity, diastolic flow velocity and mean flow velocity in the central retinal artery showed significant increases. No change was observed in vascular resistance. The subjects deemed suitable for use of HJG showed remarkable increases in blood flow. No changes in blood flow velocities and vascular resistance were observed after administration of the placebo. HJG is frequently used in the aged, often with eye diseases such as cataract. It has been reported that a decrease of blood flow in the central retinal artery becomes more marked in proportion to the progress of various eye diseases. As increases in blood flow were obvious in the cases that were treated with HJG, it is suggested that increases in blood flow in the central retinal artery due to HJG give direct evidence supporting the positive effects of HJG on eye diseases.

[A revaluation of the late Dr. Noriyuki Sugihara in Korea].

We investigate the achievements in pharmacology and administration in the field of traditional Korean and Kampo medicines by Dr. N. Sugihara. Dr. Sugihara became a professor of the 2nd dept. of pharmacology, School of Medicine, Keijo University of Seoul in 1926. Since then, until 1946, he was involved in almost all the projects related to traditional medicine in Korea and Manchuria. Also he founded several research centers in Korea, such as the Natural Product Research Institute of Keijo University (the present Natural Product Research Institute of Seoul National University). We confirm Dr. Sugihara's contribution to traditional medicine, based on an investigations of his academic records from his disciples in Korea and Japan, including the former director of Natural Product Research Institute.

Effects of Inula Britannica on the production of antibodies and cytokines and on T cell differentiation in C57BL/6 mice immunized by ovalbumin.

In this study, we investigated the effects of Inula Britannica on the production of antibodies against ovalbumin, and the differentiation of T cells, in C57BL/6 mice. The oral administration of Inula Britannica suppressed IL-4 and IL-6 production in lymphocytes collected from an inguinal lymph node in the immunized leg. On the other hand, the intraperitoneal administration of Inula Britannica suppressed IgG1 production, the ratio of IFN-gamma+IL-4-/IFN-gamma-IL-4+ cells and cytokine production of IL-6. It was presumed that the effects of Inula Britannica on the production of antibodies were induced by regulation of the balance of Th1 and Th2. Further, IL-4 and IL-6 production by lymphocytes collected from an inguinal lymph node in the immunized leg were suppressed, and therefore production of antibodies was suppressed.

Preventative effects of the flowers of Inula britannica on autoimmune diabetes in C57BL/KsJ mice induced by multiple low doses of streptozotocin.

We have reported that an aqueous extract from the flowers of Inula britannica L. subsp. japonica Kitam. (IB) prevented immunologically induced experimental hepatitis in mice and suggested that the antihepatitic effect of IB is due to inhibition of IFN-gamma production. We then investigated the effects of IB on diabetes in mice induced by multiple low doses of streptozotocin (MLDSTZ), which is a mouse model for IFN-gamma-dependent autoimmune diabetes. C57BL/KsJ mice (male, 7 weeks) were provided with IB extract (500 mg/ kg/ day) in drinking water ad libitum, starting 7 days before the first STZ injection. Autoimmune diabetes was induced by MLDSTZ (40 mg/kg/day for 5 daily doses, i.p.). The IB treatment significantly suppressed the increase of blood glucose levels. Histological analysis of the pancreas showed that the degree of insulitis and destruction of beta-cells were reduced by IB treatment. The IFN-gamma production from stimulated splenic T lymphocytes was inhibited by the IB treatment. Moreover, the proportion of IFN-gamma-producing cells in the CD4(+) population, which was increased by MLDSTZ, was significantly decreased by the IB treatment. These results suggest that IB has a preventative effect on autoimmune diabetes by regulating cytokine production.

Augmentation of immune cell activity against tumor cells by Rauwolfia radix.

In this study, we investigated the effect of Rauwolfia radix on heat shock protein (HSP) 70 expression and cytotoxicity against tumor cells in activated human T cells. When activated T cells were cultured with Rauwolfia radix for 18 h, HSP70 expression after heat shock was remarkably increased, and cytotoxicity against T98G tumor cells was augmented. Moreover, Rauwolfia radix also enhanced the cytotoxicity of heat shocked activated T cells against Molt-4 and T98G tumor cells. Secretions of interferon-gamma (IFN-gamma) and tumor necrosis alpha (TNF-alpha), due to Concanavalin A (Con A) stimulation, were increased by Rauwolfia radix in activated T cells. To investigate the antitumor effect in vivo, EL-4 tumor-bearing mice were administered with Rauwolfia radix in drinking water. The survival period of the Rauwolfia radix treatment group was significantly prolonged compared with that of the control group. Reserpine, the major active ingredient of Rauwolfia radix, also enhanced the cytotoxicity of activated T cells against Molt-4 and T98G tumor cells, and prolonged the survival period of EL-4 tumor-bearing mice. Taken together, our results suggest that Rauwolfia radix can enhance the activity of immune cells against tumor cells.

Effects of Kampo herbal medicine on plasma melatonin concentration in patients.

There are studies reporting that some natural products containing melatonin. Sleep disturbance and nocturnal polyuria are related to abnormal biorhythm. It is possible that kampo medicine may influence biorhythm. We therefore examined the symptoms and plasma melatonin of patients treated with rokumi-gan, hachimi-jio-gan, gosha-jinki-gan and seishinrenshi-in. Furthermore, the concentration of four kampo medicines and crude drugs making up these formulations were investigated. Diurnal plasma melatonin was not affected by Rokumi-gan, but tended to be lowered by treatment with hachimi-jio-gan, gosha-jinki-gan and seishinrenshi-in. Melatonin was present in several extracts from crude drugs, namely Rehmanniae radix, Moutan cortex, Cinnamomi cortex, Aconiti tuber, Plantaginis semen, Scutellariae radix and Lycii radicis cortex.

Evaluation of the anti-inflammatory effect of baicalein on dextran sulfate sodium-induced colitis in mice.

The anti-inflammatory effect of three flavonoids from the root of Scutellaria baicalensis (baicalein, baicalin and wogonin) was evaluated in a murine model of acute experimental colitis induced by dextran sulfate sodium (DSS). Baicalein, but not baicalin or wogonin, given orally at 20 mg/kg for ten days, ameliorates all the considered inflammatory symptoms of the induced colitis, such as body weight loss, blood haemoglobin content, rectal bleeding and other histological and biochemical parameters. The effect of baicalein was similar to that of sulfasalazine, the reference drug given at 50 mg/kg.

Protective effects of Polygalae root in experimental TNBS-induced colitis in mice.

In this study, the protective effect of Polygalae root was evaluated in a murine model of experimental colitis by intrarectal injection with 2,4,6-trinitrobenzene sulfonic acid (TNBS). Polygalae root, given orally at 2, 4 g/kg body weight of herbs once a day consecutively for 9 days, could recover the lost body weight and decrease the gross rectal bleeding. Polygalae root also reduced the degree of inflammation and improved significantly the histological changes such as infiltration by polymorphonuclear leukocytes and multiple erosive lesions. Furthermore, the cytokine production of intraepithelial lymphocytes was analyzed. The results showed that IFN-gamma was increased, but IL-4 was decreased in TNBS-induced colitis, when those were compared with the sham controls. But the administration of Polygalae root to TNBS-induced colitis mice showed lower production of IFN-gamma and higher production of IL-4 than the TNBS-induced colitis. These results suggest that the protective effects of Polygalae root against the TNBS colitis may be associated with the regulation of cytokine production of intraepithelial lymphocytes.

The combination therapy of Ephedra herb and Loxoprofen caused gastric lesions in mice.

The combination therapy of a Kampo formula and an analgesic-antipyretic agent is often used for the common cold in Japan. We investigated the effect of such a combination therapy, using the Ephedra herb, which is a common ingredient of Kakkon-to and Mao-to, and Loxoprofen, a nonsteroidal anti-inflammatory drug (NSAID), on fever induced in an experimental model of mice under strong stress. The combination therapy of Ephedra herb and Loxoprofen caused gastric mucosal lesions and loss of body weight. It is considered that this combination therapy should be avoided because of its adverse effects.

Effect of Kampo herbal medicines on murine water metabolism in a microgravity environment.

To determine the possibility of new applications of Oriental medicines, we examined the changes in water metabolism of mice that underwent microgravity and were treated with Kampo medicines. Male ICR mice were used in this experiment. Eight extracts of Kampo herbal medicines were dissolved in water and added to the drinking water administered to mice at 1 g/kg body weight for two days. The microgravity experiment was performed at the Japan Microgravity Center. We used a drop-shaft type microgravity experimental system with a free fall of 490 m. Before the drop, 7 ml of physiological saline was injected intraperitoneally. Under fasting and dehydration, body weights were measured and loss of body weight was calculated as urine. Blood samples were collected 24 hours after the microgravity experiment, and the antidiuretic hormone (ADH) in plasma related to water metabolism was measured by the radioimmunoassay (RIA) method. Heat shock protein in the spleen was measured by the enzyme-linked immunosolvent assay (ELISA) method. In the Hachimi-jio-gan and Hochu-ekki-to groups in microgravity, a decrease of urine was observed, which significantly suppressed the increase of ADH due to microgravity. Hachimi-jio-gan reduced the content of heat shock protein (HSP) 70 in the spleen. It is suggested that Hachimi-jio-gan and Hochu-ekki-to could be used as water metabolism adjustment reagents in a space environment. Furthermore, it is suggested that Hachimi-jio-gan could ease the stresses caused by microgravity. The physiological changes resulting from a microgravity environment are serious problems for space flight. Pre-treatment with Kampo medicines is expected to prevent, ease and treat these problems.