• Natural Product Sciences
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• 제25권3호
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• pp.261-267
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• 2019

The rhizomes of Dioscorea japonica Thunb. are widely consumed as food and also used to treat diabetes and polyuria in Korea. This study was undertaken to study the anti-atopic dermatitis effects of a 95% ethanolic extract (DJE) of D. japonica in an oxazolone-stimulated murine model of atopic dermatitis (AD). The therapeutic effects of DJE on AD-like skin lesions were assessed on both ears. DJE (1%) or dexamethasone (0.5%; the positive control) were applied to skin lesions for three weeks. Serum levels of IgE and IL-4 were assessed by ELISA (enzyme-linked immunosorbent assay). Histopathological examinations were performed by hematoxylin and eosin (H&E) and toluidine blue staining and revealed DJE significantly reduced dermal thickness and inflammatory cell infiltration when applied to oxazolone-treated ear skin. DJE-treated AD mice also showed lower serum levels of IgE and IL-4 than oxazolone-stimulated controls. Our findings demonstrate DJE might be a useful safe, topical agent for the treatment of atopic diseases.

• Natural Product Sciences
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• 제25권2호
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• pp.165-171
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• 2019

Although the functions of a standardized extract of Gingko biloba leaves (EGb $761^{(R)}$) has been reported with regard to neurobiological properties, no attention has been paid to the impact of EGb $761^{(R)}$ on the neuronal regulation of energy homeostasis. To evaluate the hypothesis that EGb $761^{(R)}$ affect the secretion of peptide tyrosine tyrosine (PYY) and the activation of free fatty acid receptor 4 (FFA4), which are involved in the neuronal circuitries that control energy homeostasis by inducing the transfer of information about the influx of energy to the brain, we examined whether EGb $761^{(R)}$ can stimulate PYY secretion in the enteroendocrine NCI-H716 cells and if EGb $761^{(R)}$ can activate FFA4 in FFA4-expressing cells. In NCI-H716 cells, EGb $761^{(R)}$ stimulated PYY secretion and the EGb $761^{(R)}$-induced PYY secretion was involved in the increase in intracellular $Ca^{2+}$ concentration and the activation of FFA4. Furthermore, in FFA4-expressing cells, EGb $761^{(R)}$ activated FFA4. These results suggest that EGb $761^{(R)}$ may affect the control of energy homeostasis via the regulation of PYY secretion and FFA4 activation.

• Natural Product Sciences
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• 제27권4호
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• pp.251-256
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• 2021

Lobelia chinensis Lour. has commonly been used in traditional Chinese medicine for the treatment of antidote, diuretic, diarrhea, and inflammation. This study aimed to identify the active compounds in an aqueous extract of L. chinensis responsible for its anti-atopic effect in vitro using RBL-2H3 cells. A chemical investigation of secondary metabolites in an aqueous extract of L. chinensis led to the isolation of nine chemical constituents, which included the four marker compounds, and these were evaluated for their inhibitory effects on IL-4 mRNA expression and the release of β-hexosaminidase in propidium iodide-induced RBL-2H3 cells. We found diosmetin and fraxidin inhibited cellular IL-4 mRNA expression, and that diosmetin and 6,8-dimethoxycoumarin inhibited DNP-specific IgE-induced degranulation in these cells. Our study suggests that diosmetin, fraxidin, and 6,8-dimethoxycoumarin are potential candidates for the treatment of atopic diseases.

• 한국식품영양과학회지
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• 제29권6호
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• pp.1112-1115
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• 2000

• 한국약용작물학회:학술대회논문집
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• 한국약용작물학회 2011년도 추계학술발표회
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• pp.232-233
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• 2011

• Natural Product Sciences
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• 제27권1호
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• pp.18-27
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• 2021

Eight cytotoxic constituents, consisting of six triterpenoids, cabralealactone (1), cabraleadiol (2), prototiamin A (3), 23-desmethyllimocin B (5), melianodiol (7) and indicalilacol (8) along with one limonoid, neemfruitins A (4) and one protolimonoid, protoxylocarpin G (6), were isolated from the extract of n-hexane of the stembark of Chisocheton pentandrus. The chemical structures were identified on the basis of spectroscopic evidence and compared to previously reported spectra. These isolated compounds appear for the first time in the plant. Compounds 1 - 8 were evaluated for their cytotoxic effect against MCF-7 breast cancer lines in vitro. Among the isolated compounds, melianodiol (7) showed the strongest cytotoxic activity with IC50 values of 16.8 µM.

• 한국식품영양과학회지
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• 제22권4호
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• pp.405-411
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• 1993

본 연구는 녹황색채소류에서 추출되어 항암효과를 나타내는 활성 물질로 보고되어 있는 phytol과 들미나리 추출물을 sarcoma 180마우스에 주사한 후 적출한 비장세포내 T임프구와 T subset, 그리고 asialo GM1$^{＋}$세포를 정량하여 다음과 같은 결과를 얻었다. 1) 종양 마우스에 phytol 을 투여하였을 때 비장세포내의 T cell과 T-subset은 종양세포이식에 의해서 상승된 치를 더욱 증가시켰다. 그러나 들미나리추출물의 경우는 대동소이하였다. 2) Asialo GM1$^{＋}$세포는 종양마우스에 phytol이나 들미나리추출물을 주사하였을 때 모두 상승하였으며 정상마우스에 phytol 을 투여하였을 때도 대조군에 비하여 상승했지만 들미나리추출물을 작용시켰을 때는 저하되었다. 3) L3T4$^{＋}$/Lyt-2$^{＋}$세포비는 종양마우스에 phytol을 주사하였을 때 감소를 보였지만 정상 마우스에 투여하였을 때는 더욱 크게 낮아졌다. 그러나 들미나리추출물을 정상마우스에 투여 하였을때는 크게 감소하던 것이 종양마우스에 적요 시켰을 때는 증가현상을 보였다. 이상의 결과로 미루어 볼 때 phytol이나 들미나리추출물은 종양마우스에서 작용자 세포인 자연살해세포(natural killer cell)의 활성 인자로서 작용할 가능성이 높을 것으로 사료된다.

• 대한한방내과학회지
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• 제19권1호
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• pp.221-246
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• 1998

The aim of this experimental study was to evaluate the anti-tumor effects of Chungsimbohyeltang through investigation about viability of tumor cell by MTT assay, survival period of mice transplanted with L-1210 cells, growth inhibition on the tumor cell, body weight variation in mice transplanted with sarcoma-180 cells and its immunomodulatory effects through the investigation on delayed type hyper-sensitivity, the hemagglutinin and hemolysin titers for humoral immune response, the appearance of rosette forming cells for cell-mediated immune response, the natural killer cell activity, the transformation of lymphocyte, the productivity of Interleukin-2 and phagocytic index K was performed in immune-depressed ICR mice induced by methotrexate treatments. The results were as follows ; 1. $IC_{50}$ of Chungsimbohyeltang treated group was 5.85mg/ml in SNU-C4 cell, 1.38mg/ml in SNU-396 cell, 0.21mg/ml in SNU-1 cell, so it had low anti-tumor activity. 2. The both groups of Chungsimbohyeltang extract 10mg/kg and Chungsimbohyeltang extract 20mg/kg had no toxicity and the group of Chungsimbohyeltang 20mg/kg which was shown 120% in ILS had the effect of life prolongation in mice transplanted with L-1210 cells. 3. In the growth inhibition on the tumor cells, only the group of Chungsimbohyeltang extract 20mg/kg was noted and in the weight variation in mice transplanted with sarcoma-180 cells, both groups of Chungsimbohyeltang extract had a significant effect. 4. In the delayed type hypersensitivity and appearance of rosette forming cells, both groups of Chungsimbohyeltang extract didn't have any significant effect. 5. The hemagglutinin titers was slightly increased with no significance, and the hemolysin titers was significantly increased in the only group of Chungsimbohyeltang extract 20mg/kg. 6. The natural killer cell activity of the Chungsimbohyeltang extract groups was significantly increased in the ratio of 100:1 of effector and target cells, but it was not significantly increased in the ratio of 50:1, 10:1. 7. The transformation of lymphocyte and the productivity of Interleukin-2 were increased significantly and in dose-dependent manner in both group of Chungsimbohyeltang extract. 8. The phagocytic effect of macropage was significantly increased in both groups of Chungsimbohyeltang extract. Considering the results above, we could conclude that Chungsimbohyeltang have an indirect anti-tumor effect through the modulation of immunme response, although it had not toxicity on the tumor cell it self.

• 한국가금학회지
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• 제31권1호
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• pp.25-31
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• 2004

본 연구는 육계 생산과정에서의 천연항생제 개발을 위해서 옻나무 추출액의 급여가 육계의 생산성에 미치는 영향에 대해서 조사하였다. 총320수의 1일령 육계에 옻나무 추출액 0 ppm (대조구), 500 ppm (T1), 1,000 ppm (T2) 및 2,000 ppm (T3)을 음용수와 함께 7주간 급여하였다. 증체중과 사료요구율은 35일령 까지 차이는 인정되지 않았지만, 그 이후는 옻나무추출액의 급여구가 개선되어지는 경향이 인정되었고 그 개선정도는 T3구에서 더 크게 나타났다. 맹장 내용물 및 분중의 대장균과 살모넬라균은 옻나무 추출액의 급이에 의해서 감소되었다. 사료중 건물, 조지방 및 조회분 소화율은 옻나무 추출액 급이에 의해서 개선되어지는 경향이 인정되었으며, 사료중 조단백질 소화율은 3개의 처리구 공히 대조구에 비해서 유의하게 개선되었다 (P＜0.05). 이상의 결과를 종합해 보면, 증체량, 사료요구율, 맹장내용물과 분중의 대장균과 살모넬라균총의 감소 및 영양소 소화율은 옻나무 추출액의 음수투여가 효과적인 것으로 사료된다.

• Molecules and Cells
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• 제20권2호
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• pp.235-240
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• 2005

Extracts of pine needles (Pinus densiflora Sieb. et Zucc.) have diverse physiological and pharmacological actions. In this study we show that pine needle extract alters pacemaker currents in interstitial cells of Cajal (ICC) by modulating ATP-sensitive $K^+$ channels and that this effect is mediated by prostaglandins. In whole cell patches at $30^{\circ}C$, ICC generated spontaneous pacemaker potentials in the current clamp mode (I = 0), and inward currents (pacemaker currents) in the voltage clamp mode at a holding potential of -70 mV. Pine needle extract hyperpolarized the membrane potential, and in voltage clamp mode decreased both the frequency and amplitude of the pacemaker currents, and increased the resting currents in the outward direction. It also inhibited the pacemaker currents in a dose-dependent manner. Because the effects of pine needle extract on pacemaker currents were the same as those of pinacidil (an ATP-sensitive $K^+$ channel opener) we tested the effect of glibenclamide (an ATP-sensitive $K^+$ channels blocker) on ICC exposed to pine needle extract. The effects of pine needle extract on pacemaker currents were blocked by glibenclamide. To see whether production of prostaglandins (PGs) is involved in the inhibitory effect of pine needle extract on pacemaker currents, we tested the effects of naproxen, a non-selective cyclooxygenase (COX-1 and COX-2) inhibitor, and AH6809, a prostaglandin EP1 and EP2 receptor antagonist. Naproxen and AH6809 blocked the inhibitory effects of pine needle extract on ICC. These results indicate that pine needle extract inhibits the pacemaker currents of ICC by activating ATP-sensitive $K^+$ channels via the production of PGs.