• Molecules and Cells
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• 제39권11호
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• pp.834-840
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• 2016

Caenorhabditis elegans (C. elegans) utilizes two different cell-cycle modes, binucleations during the L1 larval stage and endoreduplications at four larval moltings, for its postembryonic intestinal development. Previous genetic studies indicated that CDC-25.2 is specifically required for binucleations at the L1 larval stage and is repressed before endoreduplications. Furthermore, LIN-23, the C. elegans ${\beta}$-TrCP ortholog, appears to function as a repressor of CDC-25.2 to prevent excess intestinal divisions. We previously reported that intestinal hyperplasia in lin-23(e1883) mutants was effectively suppressed by the RNAi depletion of cdc-25.2. Nevertheless, LIN-23 targeting CDC-25.2 for ubiquitination as a component of E3 ubiquitin ligase has not yet been tested. In this study, LIN-23 is shown to be the major E3 ubiquitin ligase component, recognizing CDC-25.2 to repress their activities for proper transition of cell-cycle modes during the C. elegans postembryonic intestinal development. In addition, for the first time that LIN-23 physically interacts with both CDC-25.1 and CDC-25.2 and facilitates ubiquitination for timely regulation of their activities during the intestinal development.

• 생명과학회지
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• 제26권12호
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• pp.1466-1469
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• 2016

운향과(Rutaceae) 식물의 과실을 소재로 하는 일군의 한약재들은 위장관 운동 기능 항진을 목적으로 우리나라와 중국 등지에서 오래 전부터 널리 사용되어 왔으며, 대표적인 약재로 각각 탱자나무 및 광귤나무의 미성숙 과실인 지실 및 지각, 각각 광귤나무 및 귤나무의 성숙 과피인 등피 및 진피 등이 있다. 본 연구에서는, 이러한 운향과 과실 유래 한약재들이 위장관 운동 기능에 미치는 영향을 검정하고 이 약재들 간의 효능을 비교하기 위해, 이들 한약재의 열수 및 에탄올 추출물을 제조하여 마우스에 경구 투여한 후 위 배출 속도 및 장 이송률을 측정하는 실험을 수행하였다. 본 연구는, 공통 성분을 다수 함유하는 운향과 과실 유래 한약재들 간의 위장관 운동 기능개선 효과를 in vivo 동물 실험을 통해 직접 비교한 최초의 연구 자료로서 의미를 가진다. 특히, 등피 에탄올 추출물 투여 시 위 배출 속도에는 유의적인 변화 없이 장 이송률의 유의적 및 용량 의존적 증가 양상을 보였으며, 이전 연구들을 통해 장 이송률 증가 효능이 보고된 바 있는 지실, 지각, 진피 열수 추출물 투여군들과 비교했을 때에도 수치 상으로 등피 에탄올 추출물의 장 이송률이 가장 높았다.

• Journal of Animal Science and Technology
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• 제60권6호
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• pp.10.1-10.6
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• 2018

Background: Stress causes inflammation that impairs intestinal barrier function. Dietary spray-dried plasma (SDP) has recognized anti-inflammatory effects and improvement of gut barrier function. Therefore, the purpose of this study was to investigate the effects of dietary SDP on intestinal morphology of mated female mice under stress condition. Results: Villus height, width, and area of small intestines were low on gestation day (GD) 3 or 4 under stress conditions, and higher later (Time, P < 0.05). Crypt depth of colon was low on GD 4 and higher later (Time, P < 0.05). Meanwhile, the SDP treatments improved (P < 0.05) intestinal morphology, indicated by increased villus height, villus width, villus area, and ratio between villus height and crypt depth of small intestines and crypt depth of colon, and by decreased crypt depth of small intestines, compared with the control diet. The SDP treatments also increased (P < 0.05) the number of goblet cells in intestines compared with the control diet. There were no differences between different levels of SDP. Conclusion: Dietary SDP improves intestinal morphology of mated female mice under stress condition.

• Journal of Radiation Protection and Research
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• 제45권4호
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• pp.163-170
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• 2020

Background: Gut microflora contributes to the nutritional metabolism of the host and to strengthen its immune system. However, if the intestinal barrier function of the living body is destroyed by radiation exposure, the intestinal bacteria harm the health of the host and cause sepsis. Therefore, this study aims to trace short-term radiation-induced changes in the mouse gut microflora-dominant bacterial genus, and analyze the degree of intestinal epithelial damage. Materials and Methods: Mice were irradiated with 0, 2, 4, 8 Gy X-rays, and the gut microflora and intestinal epithelial changes were analyzed 72 hours later. Five representative genera of Actinobacteria, Firmicutes, and Bacteroidetes were analyzed in fecal samples, and the intestine was pathologically analyzed by Hematoxylin-Eosin and Alcian blue staining. In addition, DNA fragmentation was evaluated by the TdT-mediated dUTP nick-end labeling (TUNEL) assay. Results and Discussion: The small intestine showed shortened villi and reduced number of goblet cells upon 8 Gy irradiation. The large intestine epithelium showed no significant morphological changes, but the number of goblet cells were reduced in a radiation dose-dependent manner. Moreover, the small intestinal epithelium of 8 Gy-irradiated mice showed significant DNA damaged, whereas the large intestine epithelium was damaged in a dose-dependent manner. Overall, the large intestine epithelium showed less recovery potential upon radiation exposure than the small intestinal epithelium. Analysis of the intestinal flora revealed fluctuations in lactic acid bacteria excretion after irradiation regardless of the morphological changes of intestinal epithelium. Altogether, it became clear that radiation exposure could cause an immediate change of their excretion. Conclusion: This study revealed changes in the intestinal epithelium and intestinal microbiota that may pave the way for the identification of novel biomarkers of radiation-induced gastrointestinal disorders and develop new therapeutic strategies to treat patients with acute radiation syndrome.

• Asian-Australasian Journal of Animal Sciences
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• 제19권4호
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• pp.554-562
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• 2006

Two lines of mice, M16 selected for rapid growth and a randomly selected control ICR as well as their reciprocal crosses were used to study the effects of genotype on whole-body energetics and intestinal responses to monensin. Six mice, eight weeks of age, from each line or reciprocal cross were assigned to one of two treatments, 1) drinking water containing 20 mmol/L monensin dissolved in 0.5% V/V ethanol, and 2) drinking water containing 0.5% V/V ethanol (control) for two weeks. After 11 days (age of 9 weeks and 4 days), whole-body $O_2$ consumption was measured. At the end of two weeks, jejunal $O_2$ consumption, intestinal tissue composition and histomorphometrics as well as the rate and efficiency of glucose absorption were estimated. In comparison with the control, monensin administration in drinking water resulted in less daily water intake (13.4 vs. 15.5 ml/mouse, p<0.01), less protein to DNA ratio of jejunal mucosa (5.41 vs. 6.01 mg/mg, p<0.05), lower villus width (88 vs. $100{\mu}m$, p<0.05), and less jejunal tissue $O_2$ consumption enhancement by alcohol (7.2 vs. 10.5%, p<0.01) in mice. Other than those changes, monensin had little (p>0.05) effect on variables measured in either line of mice or their reciprocal cross. In contrast, the M16 line, selected for rapid growth, as compared to the ICR controls or the reciprocal crosses, had less initial (pre-monensin treatment) whole-body $O_2$ consumption per gram of body weight (1.68 vs. $2.11-2.34{\mu}mol/min{\cdot}g$ BW, p<0.01) as compared to the ICR and reciprocal crosses. In addition, the M16 mice exhibited greater growth (412 vs. 137-210 mg/d, p<0.05), better feed efficiency (41.7 vs. 19.9-29.3 mg gain/g feed, p<0.05), shorter small intestines adjusted for fasted body weight (1.00 vs. 1.22-1.44 cm/g FBW, p<0.05), wider villi (109 vs. $87-93{\mu}m$, p<0.05), more mature height of enterocytes (28.8 vs. $24.4-25.1{\mu}m$, p<0.05) and a lower rate (91 vs. $133-145{\eta}mol\;glucose/min{\cdot}g$ jejunum, p<0.05) and less energetic efficiency (95 vs. $59-72{\eta}mol$ ATP expended/${\eta}mol$ glucose uptake, p<0.05) of glucose absorption compared to the ICR line and the reciprocal cross. Monensin had little (p>0.05) effect on whole-body $O_2$ consumption and jejunal function, whilst selection for rapid growth resulted in an apparent down-regulation of intestinal function. These data suggest that genetic selection for increased growth does not result in concomitant changes in intestinal function. This asynchrony in the selection for production traits and intestinal function may hinder full phenotypic expression of genotypic growth potential.

• 한국식품영양과학회지
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• 제43권1호
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• pp.55-59
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• 2014

치커리 화이바는 콜레스테롤 개선, 배변활동 원활, 식후혈당 상승억제의 기능성을 바탕으로 건강기능식품 기능성 원료로 사용되고 있다. 배변활동에 도움을 주는 치커리 화이바를 발효하여 변비개선 효능을 확인한 결과 실험기간 동안 식이 섭취량이 증가한 반면 체중이 유의적으로 감소하는 것으로 보아 비만예방에 효과가 있을 것으로 생각된다. 장 기능 개선효과를 확인하기 위해 소화관 이동률을 측정한 결과 대조군에 비해 양성 대조군 FWP(차전자피복합물), 실험군 CF(치커리 화이바), 실험군 FCF(치커리 화이바 발효물)에서 소화관 이동률이 증가하였고, 특히 실험군 FCF 1.62 mg/g (P<0.01)과 실험군 4.13 mg/g(P<0.05)의 경우 실험군 CF 동일 농도에 비해 소화관 이동률이 유의적으로 증가하였다. 또한 변비개선 효과를 확인하기 위해 대장 내 잔류하고 있는 변의 개수를 확인한 결과 변비를 유발시킨 loperamide 처리군은 대조군에 비해 대장 내에 변이 잔류하면서 배변활동이 제대로 이루어지지 않아 대장 내 변의 개수가 유의적으로 증가한 반면, 양성 대조군 FWP와 실험군 CF, 실험군 FCF에서 대장 내 변의 개수를 유의적으로 감소시켰고 특히 실험군 FCF 2.06 mg/g의 경우 실험군 CF 동일 농도에 비해 대장 내 변의 개수를 유의적으로 감소시켰다(P<0.01). 본 연구결과를 통해 치커리 화이바를 발효함으로써 배변활동 및 변비개선능이 비발효 치커리 화이바에 비하여 더욱 증진되는 것을 확인할 수 있었다. 따라서 발효된 치커리 화이바가 배변 및 변비 기능성을 증진시키는 소재로 활용될 수 있을 것으로 사료된다.

• Journal of Microbiology and Biotechnology
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• 제25권4호
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• pp.479-491
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• 2015

Lactobacillus species have been shown to enhance intestinal epithelial barrier function, modulate host immune responses, and suppress the growth of pathogenic bacteria, yeasts, molds, and viruses. Thus, lactobacilli have been used as probiotics for treating various diseases, including intestinal disorders, and as biological preservatives in the food and agricultural industries. However, the molecular mechanisms used by lactobacilli to suppress pathogenic bacterial infections have been poorly characterized. We previously isolated Lactobacillus plantarum JSA22 from buckwheat sokseongjang, a traditional Korean fermented soybean food, which possessed high enzymatic, fibrinolytic, and broad-spectrum antimicrobial activity against foodborne pathogens. In this study, we investigated the effects of L. plantarum JSA22 on the growth of S. Typhimurium and S. Typhimurium-induced cytotoxicity by stimulating the host immune response in intestinal epithelial cells. The results showed that coincubation of S. Typhimurium and L. plantarum JSA22 with intestinal epithelial cells suppressed S. Typhimurium infection, S. Typhimurium-induced NF-κB activation, and IL-8 production, and lowered the phosphorylation of both Akt and p38. These data indicated that L. plantarum JSA22 has probiotic properties, and can inhibit S. Typhimurium infection of intestinal epithelial cells. Our findings can be used to develop therapeutic and prophylactic agents against pathogenic bacteria.

• 한국콘텐츠학회논문지
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• 제21권7호
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• pp.650-659
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• 2021

본 연구의 목적은 참다래(키위)로 만든 제품의 장 기능 및 변비 개선에 미치는 효과를 알아보고자 하는 것이다. 연구 참여자는 21명으로 주관적 변비 증상을 호소하는 자로서 기저질환을 가지고 있지 않은 일반인이었다. 연구 설계는 사전 실험설계이며 참다래(키위)를 복용하고 이에 대한 주효과인 대장 정체 점수와 대장 통과 시간을 측정한다. 부효과는 주관적 변비 사정검사를 측정하여 개인적으로 변비 개선 정도를 분석하였다. 연구결과는 주효과에 있어 변비군의 숫자가 통계적으로 유의하게 감소하였으며, 대장 정체 점수 및 대장 통과 시간이 감소한 것으로 나타났다. 또한 연구 참여자들의 주관적 변비 사정검사 결과 참다래(키위)제품 섭취 전후 주관적 변비 사정검사에서 통계적으로 유의하게 장 기능 및 배변 활동의 개선을 나타내었다. 참다래(키위)제품이 기존에 알려진 다시마 및 유산균, 섬유질 제품과 유사하게 장 기능 활성화 및 변비 개선에 통계적으로 유의하게 효과를 미치는 것으로 나타났다. 더불어 본 연구에서 사용한 참다래(키위)가 기능성 식품이 아니며, 접근성이 용이한 과일이라는 장점으로 인해 본 연구의 결과는 향후 배변 활동 도움에 되는 건강식품 콘텐츠 개발에 긍정적 정보를 제공할 것으로 보인다. 하지만 본 연구는 사전 실험설계로서의 한계를 가진다. 이에 향후 무작위 실험군 대조군 연구를 제안하는 바이다.

• Animal Bioscience
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• 제35권8호
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• pp.1235-1249
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• 2022

Objective: The purpose of this study was to evaluate the protection of glutamate (GLU) against the impairment in intestinal barrier function induced by lipopolysaccharide (LPS) stress in weaned pigs. Methods: Twenty-four weaned pigs were divided into four treatments containing: i) non-challenged control, ii) LPS-challenged control, iii) LPS+1.0% GLU, and iv) LPS+2.0% GLU. On day 28, pigs were treated with LPS or saline. Blood samples were collected at 0, 2, and 4 h post-injection. After blood samples collection at 4 h, all pigs were slaughtered, and spleen, mesenteric lymph nodes, liver and intestinal samples were obtained. Results: Dietary GLU supplementation inhibited the LPS-induced oxidative stress in pigs, as demonstrated by reduced malondialdehyde level and increased glutathione level in jejunum. Diets supplemented with GLU enhanced villus height, villus height/crypt depth and claudin-1 expression, attenuated intestinal histology and ultrastructure impairment induced by LPS. Moreover, GLU supplementation reversed intestinal intraepithelial lymphocyte number decrease and mast cell number increase induced by LPS stress. GLU reduced serum cortisol concentration at 4 h after LPS stress and downregulated the mRNA expression of intestinal corticotropin-releasing factor signal (corticotrophin-releasing factor [CRF], CRF receptor 1 [CRFR1], glucocorticoid receptor, tryptase, nerve growth factor, tyrosine kinase receptor A), and prevented mast cell activation. GLU upregulated the mRNA expression of intestinal transforming growth factor β. Conclusion: These findings indicate that GLU attenuates LPS-induced intestinal mucosal barrier injury, which is associated with modulating CRF signaling pathway.

• IMMUNE NETWORK
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• 제15권1호
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• pp.1-8
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• 2015

Innate immune cells survey antigenic materials beneath our body surfaces and provide a front-line response to internal and external danger signals. Dendritic cells (DCs), a subset of innate immune cells, are critical sentinels that perform multiple roles in immune responses, from acting as principal modulators to priming an adaptive immune response through antigen-specific signaling. In the gut, DCs meet exogenous, non-harmful food antigens as well as vast commensal microbes under steady-state conditions. In other instances, they must combat pathogenic microbes to prevent infections. In this review, we focus on the function of intestinal DCs in maintaining intestinal immune homeostasis. Specifically, we describe how intestinal DCs affect IgA production from B cells and influence the generation of unique subsets of T cell.