• BMB Reports
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• 제50권10호
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• pp.516-521
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• 2017

$CLB_{2.0}$, a constituent of PM, induces secretion of multiple cytokines and chemokines that regulate airway inflammation. Specifically, IL-6 upregulates $CLB_{2.0}$-induced MUC5AC and MUC1 expression. Interestingly, of the tight junction proteins examined, claudin-1 expression was inhibited by $CLB_{2.0}$. While the overexpression of claudin-1 decreased $CLB_{2.0}$-induced MUC5AC expression, it increased the expression of the anti-inflammatory mucin, MUC1. $CLB_{2.0}$-induced IL-6 secretion was mediated by ROS. The ROS scavenger N-acetyl-cysteine inhibited $CLB_{2.0}$-induced IL-6 secretion, thereby decreasing the $CLB_{2.0}$-induced MUC5AC expression, whereas $CLB_{2.0}$-induced MUC1 expression increased. $CLB_{2.0}$ activated the ERK1/2 MAPK via a ROS-dependent pathway. ERK1/2 downregulated the claudin-1 and MUC1 expressions, whereas it dramatically increased $CLB_{2.0}$-induced MUC5AC expression. These findings suggest that $CLB_{2.0}$-induced ERK1/2 activation acts as a switch for regulating inflammatory conditions though a ROS-dependent pathway. Our data also suggest that secreted IL-6 regulates $CLB_{2.0}$-induced MUC5AC and MUC1 expression via ROS-mediated downregulation of claudin-1 expression to maintain mucus homeostasis in the airway.

• 대한수의학회지
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• 제30권4호
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• pp.361-371
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• 1990

The present observations were focussed mainly on the morphological findings of the utero-vaginal(U-V) glands in normal laying domestic hens and the storage of cock spermatozoa in the U-V glands at various times after artificial insemination(AI). These domestic hens were assigned to three group of PMS-treated, GnRH-treated before last AI, and control group. The hens were sacrified at intervals of 1,3,7,12 and 19 days after AI. Histological sections of U-V junctions were prepared and the morphological structures of the U-V glands were observed and then were scored about the spermatozoa presence in the U-V gland. 1. The U-V glandular tubules were mostly unbranched with single columnar epithelium. Also these tubules were occassionally observed as one circular-rotated tubules or 2 to 3 branched convoluted tubules in special shapes. The numbers of the convoluted curves per tubule were $4.3{\pm}3.3$ and the ranges of convoluted curve number were straight to 16 curves. 2. The inside and outside diameters of the glandular tubules were $6.5{\pm}3.5{\mu}m$, and $35.2{\pm}4.7{\mu}m$, respectively, and the tubular lengths of the U-V glands were $219.3{\pm}115.7{\mu}m$. 3. Storaged spermatozoa in the U-V glands of all three group hens were intensively stained by hematoxylin, and packed in tight, longitudinally parallel bundles within the tubules. In addition, numbers of completely spermatozoa-filled glands were tend to increase or decrease in proportion to the numbers of partially spermatozoa-filled glands. Also U-V glands containing spermatozoa tend to be present collectively in the any zone of U-V junction. 4. In the control group, the numbers of glands containing spermatozoa in the hens at 1,3,7,12, and 19 days after AI were found to be 22.9, 33.3, 35.8, 8.6, and 0% respectively. 5. In the PMS-treated group, the numbers of glands containing spermatozoa in the hens at 1,3,7,12, and 19 days after AI were found to be 33.6, 29.7, 26.8, 8.2 and 0% respectively. 6. In the GnRH-treated group, the numbers of glands containing spermatozoa in the hens at 1,3,7,12, and 19 days after AI were found to be 19.7, 40.8, 20.4, and 0% respectively.

• Biomolecules & Therapeutics
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• 제25권2호
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• pp.213-221
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• 2017

Baicalein, a natural flavonoid obtained from the rhizome of Scutellaria baicalensis Georgi, has been reported to have anticancer activities in several human cancer cell lines. However, its antimetastatic effects and associated mechanisms in melanoma cells have not been extensively studied. The current study examined the effects of baicalein on cell motility and anti-invasive activity using mouse melanoma B16F10 cells. Within the noncytotoxic concentration range, baicalein significantly inhibited the cell motility and invasiveness of B16F10 cells in a concentration-dependent manner. Baicalein also reduced the activity and expression of matrix metalloproteinase (MMP)-2 and -9; however, the levels of tissue inhibitor of metalloproteinase-1 and -2 were concomitantly increased. The inhibitory effects of baicalein on cell motility and invasiveness were found to be associated with its tightening of tight junction (TJ), which was demonstrated by an increase in transepithelial electrical resistance and downregulation of the claudin family of proteins. Additionally, treatment with baicalein markedly reduced the expression levels of lipopolysaccharide-induced phosphorylated Akt and the invasive activity in B16F10 cells. Taken together, these results suggest that baicalein inhibits B16F10 melanoma cell migration and invasion by reducing the expression of MMPs and tightening TJ through the suppression of claudin expression, possibly in association with a suppression of the phosphoinositide 3-kinase/Akt signaling pathway.

• Journal of Ginseng Research
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• 제45권3호
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• pp.433-441
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• 2021

Background: Multiple sclerosis (MS) and its animal model, the experimental autoimmune encephalomyelitis (EAE), are primarily characterized as dysfunction of the blood-brain barrier (BBB). Ginsenoside-Rg3-enriched Korean Red Ginseng extract (Rg3-KRGE) is known to exert neuroprotective, anti-inflammatory, and anti-oxidative effects on neurological disorders. However, effects of Rg3-KRGE in EAE remain unclear. Methods: Here, we investigated whether Rg3-KRGE may improve the symptoms and pathological features of myelin oligodendroglial glycoprotein (MOG)_35-55 peptide - induced chronic EAE mice through improving the integrity of the BBB. Results: Rg3-KRGE decreased EAE score and spinal demyelination. Rg3-KRGE inhibited Evan's blue dye leakage in spinal cord, suppressed increases of adhesion molecule platelet endothelial cell adhesion molecule-1, extracellular matrix proteins fibronection, and matrix metallopeptidase-9, and prevented decreases of tight junction proteins zonula occludens-1, claudin-3, and claudin-5 in spinal cord following EAE induction. Rg3-KRGE repressed increases of proinflammatory transcripts cyclooxygenase-2, inducible nitric oxide synthase, interleukin (IL)-1 beta, IL-6, and tumor necrosis factor-alpha, but enhanced expression levels of anti-inflammatory transcripts arginase-1 and IL-10 in the spinal cord following EAE induction. Rg3-KRGE inhibited the expression of oxidative stress markers (MitoSOX and 4-hydroxynonenal), the enhancement of nicotinamide adenine dinucleotide phosphate (NADPH) oxidase 2 (NOX2) and NOX4, and NADPH activity in the spinal cord of chronic EAE mice. Furthermore, apocynin, a NOX inhibitor, mimicked beneficial effects of Rg3-KRGE in chronic EAE mice. Conclusion: Our findings suggest that Rg3-KRGE might alleviate behavioral symptoms and pathological features of MS by improving BBB integrity through modulation of NOX2/4 expression.

• Animal Bioscience
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• 제35권11호
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• pp.1711-1724
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• 2022

Objective: The present study was to evaluate the effects of different rapeseed meal substitution (RSM) and glutamine (Gln) supplementation on growth performance, intestine morphology, and intestinal mucosa barrier of broilers. Methods: Four hundred and twenty Qiandongnan Xiaoxiang Chicken at 1 day of age with similar weight were chosen and were randomly assigned into 7 groups, consisting of 10 replicates per group and 6 broilers per replicate. Three groups were provided with diets separately containing 0%, 10%, and 20% RSM, and the other four groups were fed with diets separately supplemented with 0.5% and 1% Gln based on the inclusion of 10% and 20% RSM. At 21 and 42 days of age, 10 broilers per group were chosen to collect plasma and intestinal samples for further analysis. Results: The results showed that 10% RSM decreased average daily feed intake (ADFI) and average daily weight gain (ADG) of broilers at 21 days of age (p<0.05). Furthermore, both ADFI and ADG of broilers at 21 and 42 days of age were decreased by 20% RSM, while feed conversion ratio (FCR) was increased (p<0.05). Besides, 10% RSM resulted in lower intestinal villus height and the ratio of villus height to crypt depth, deeper crypt depth (p<0.05), combined with the lower mRNA expressions of occludin, claudin-1, and zonula occludens-1 (ZO-1) in broilers at 21 days of age (p<0.05). Similar results were also observed in broilers at 21 and 42 days of age fed with 20% RSM. However, 1% Gln improved the growth performance of broilers fed with 10% and 20% RSM (p<0.05), ameliorated intestine morphology and elevated mRNA expressions of occludin, claudin-1 and ZO-1 (p<0.05). Conclusion: In conclusion, the increasing inclusion of RSM resulted in more serious effects on broilers, however, 1.0% Gln could reverse the negative effects induced by the inclusion of RSM.

• Journal of Microbiology and Biotechnology
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• 제34권6호
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• pp.1287-1298
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• 2024

Ulcerative colitis (UC) is an inflammatory bowel disease (IBD) that is currently difficult to treat effectively. Both Bacillus natto (BN) and ginseng-soluble dietary fiber (GSDF) are anti-inflammatory and helps sustain the intestinal barrier. In this study, the protective effects and mechanism of the combination of B. natto JLCC513 and ginseng-soluble dietary fiber (BG) in DSS-induced UC mice were investigated. Intervention with BG worked better than taking BN or GSDF separately, as evidenced by improved disease activity index, colon length, and colon injury and significantly reduced the levels of oxidative and inflammatory factors (LPS, ILs, and TNF-α) in UC mice. Further mechanistic study revealed that BG protected the intestinal barrier integrity by maintaining the tight junction proteins (Occludin and Claudin1) and inhibited the LPS/TLR4/NF-κB pathway in UC mice. In addition, BG increased the abundance of beneficial bacteria such as Bacteroides and Turicibacter and reduced the abundance of harmful bacteria such as Allobaculum in the gut microbiota of UC mice. BG also significantly upregulated genes related to linoleic acid metabolism in the gut microbiota. These BG-induced changes in the gut microbiota of mice with UC were significantly correlated with changes in pathological indices. In conclusion, this study demonstrated that BG exerts protective effect against UC by regulating the LPS/TLR4/NF-κB pathway and the structure and metabolic function of gut microbiota. Thus, BG can be potentially used in intestinal health foods to treat UC.

• Journal of Microbiology and Biotechnology
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• 제34권3호
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• pp.547-561
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• 2024

In this study, we aim to investigate the precise alterations in the gut microbiota during the onset and advancement of diabetic nephropathy (DN) and examine the impact of Ruminococcus gnavus (R. gnavus) on DN. Eight-week-old male KK-Ay mice were administered antibiotic cocktails for a duration of two weeks, followed by oral administration of R. gnavus for an additional eight weeks. Our study revealed significant changes in the gut microbiota during both the initiation and progression of DN. Specifically, we observed a notable increase in the abundance of Clostridia at the class level, higher levels of Lachnospirales and Oscillospirales at the order level, and a marked decrease in Clostridia_UCG-014 in DN group. Additionally, there was a significant increase in the abundance of Lachnospiraceae, Oscillospiraceae, and Ruminococcaceae at the family level. Moreover, oral administration of R. gnavus effectively aggravated kidney pathology in DN mice, accompanied by elevated levels of urea nitrogen (UN), creatinine (Cr), and urine protein. Furthermore, R. gnavus administration resulted in down-regulation of tight junction proteins such as Claudin-1, Occludin, and ZO-1, as well as increased levels of uremic toxins in urine and serum samples. Additionally, our study demonstrated that orally administered R. gnavus up-regulated the expression of inflammatory factors, including nucleotide-binding oligomerization domain-like receptor pyrin domain-containing protein 3 (NLRP3) and Interleukin (IL)-6. These changes indicated the involvement of the gut-kidney axis in DN, and R. gnavus may worsen diabetic nephropathy by affecting uremic toxin levels and promoting inflammation in DN.

• Applied Microscopy
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• 제25권4호
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• pp.83-103
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• 1995

This experiment was carried out to investigate the effects of telluric acid on the histological and fine structural changes in the rat liver. Fischer 344 rats($150{\sim}200gm$) were used in this study as control and experimental groups. Telluric acid(5 mg/100 gm of body weight) suspensed in olive oil was given intraperitoneally to the animals of the experimental group and only olive oil to those of the control group. At the intervals of 3, 6 and 12 hours, 1, 2, 3, 5, 10, 20, 30 and 60 days after administration, the animals were sacrificed, and livers were obtained from the rats. For light microscopic examination of the liver, sections($5{\mu}m$) were stained with hematoxylineosin(H-E). For electron microscopic examination of the liver, sections were stained with uranyl acetate and lead citrate, finally examined with Zeiss EM 109 electron microscopes. The results obtained were as follows. 1. In the control group, round nucleus. well developed mitochondria, Golgi apparatus, rough endoplasmic reticulum(RER) and numerous glycogen particles were observed in the cytoplasm of the hepatocyte. In the cytoplasmic membranes of the hepatocyte, sinusoidal surface had numerous microvilli and cellular surface is combinated adjacent hepatocyte with desmosomes. The RER cisterns were dilated and zymogen granules were fewer than those of the dark cells. Kupffer cells with irregular nuclear membrane were observed. Fat storing cell and collagenous fiber bundle were observed in the Disse space. 2. Kupffer cell, inflammatory cells in the connective tissue of hepatic triad and lysosome were increased in the 3, 6, and 12 hour experimental group comparing with that of the control group. 3. In the 1 day experimental group, infiltration of inflammatory cells in interlobular connective tissue, dilatation of sinusoidal capillary and increasing of Kupffer cell were observed. Atropic change of hepatocyte and aggregation of glycogen particles in the cytoplasm of hepatocyte were observed. In this group, desmosome near bile canaliculi and collagenous fiber bundle in the Disse space were increased comparing with that of the 12 hours experimental group. In the 2 days experimental group, desmosome, lysosome, peroxisome and collagenous fiber bundle were increased comparing with that of the 1 day experimental group. Furthermore, lamellated bodies were also seen in the cytoplasm of the hepatocyte. 4. In 3 and 5 days experimental groups, transformations of hepatic cell cord and degeneration of the hepatocyte were markedly inclosed comparing with the all experimental groups. And damaged RER and mitochondria. collagenous fiber bundle were also inclosed comparing with that of the 2 days experimental group. Autophagosome and fat storing cells with large lipid droplets were also observed comparing with that of the 2 days experimental group. Tight junction and desmosome between the hepatocytes were separated. These degenerating changes were severe through the all experimental groups. 5. In the 10 and 20 days experimental groups, arrangement of hepatic cell cords and cell organelles of hepatocytes were similar to those of the control group. However, aggregation of glycogen particles, dilatation of sinusoidal capillary and infiltration of inflammatory cells remained. 6. In the 30 days experimental group, the tissue findings were similar to those of the control grout. But lamellated bodies in some hepatocytes and lysosome were remained in the cytoplasms of the Kupffer cells. In the 60 days experimental group, these all changes were recovered as the control group. In conclusion, telluric acid would directly induce the degenerative and necrotic changes on the hepatic tissue. However, these changes were perfectly recoverd in the 60 days experimental group as the control group.

• Asian-Australasian Journal of Animal Sciences
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• 제33권12호
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• pp.2008-2020
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• 2020

Objective: This study was conducted to investigate the effects of dietary corn resistant starch (RS) on the intestinal morphology and barrier functions of broilers. Methods: A total of 320 one-day-old broilers were randomly allocated to 5 dietary treatments: one normal corn-soybean (NC) diet, one corn-soybean-based diet supplementation with 20% corn starch (CS), and 3 corn-soybean-based diets supplementation with 4%, 8%, and 12% corn resistant starch (RS) (identified as 4% RS, 8% RS, and 12% RS, respectively). Each group had eight replicates with eight broilers per replicate. After 21 days feeding, one bird with a body weight (BW) close to the average BW of their replicate was selected and slaughtered. The samples of duodenum, jejunum, ileum, caecum digesta, and blood were collected. Results: Birds fed 4% RS, 8% RS and 12% RS diets showed lower feed intake, BW gain, jejunal villus height (VH), duodenal crypt depth (CD), jejunal VH/CD ratio, duodenal goblet cell density as well as mucin1 mRNA expressions compared to the NC group, but showed higher concentrations of cecal acetic acid and butyric acid, percentage of jejunal proliferating cell nuclear antigen-positive cells and delta like canonical Notch ligand 4 (Dll4), and hes family bHLH transcription factor 1 mRNA expressions. However, there were no differences on the plasma diamine oxidase activity and D-lactic acid concentration among all groups. Conclusion: These findings suggested that RS could suppress intestinal morphology and barrier functions by activating Notch pathway and inhibiting the development of goblet cells, resulting in decreased mucins and tight junction mRNA expression.

• 대한화장품학회지
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• 제43권2호
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• pp.157-164
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• 2017

스테비아(Stevia rebaudiana)는 남아메리카 지역이 원산지인 국화과 스테비아 속의 다년생 식물로 스테비올(steviol)을 기본 구조로 하는 다양한 배당체가 존재하며 스테비오사이드(stevioside)와 리바우디오사이드(rebaudioside) A 등이 주성분이다. 스테비올 배당체들은 설탕보다 단맛이 월등히 뛰어나 감미료로 널리 사용되어지고 있다. 최근 여러 논문들에서 스테비올 배당체들이 미백 및 항염 효과 뿐 아니라 피부장벽 타이트정션 단백질 조절에 연관되어 있다는 보고가 있었다. 따라서 본 연구에서는 스테비올 배당체인 리바우디오사이드 A의 항염 효과 연구를 통해 향후 아토피 피부염 개선 화장품 원료 개발 가능성을 확인하고자 하였다. 항염 연구를 위해 마우스 대식세포인 RAW264.7 세포를 이용하여 cell viability 및 염증 유발 사이토카인 mRNA 발현량을 분석하였다. 우선 cell viability 측정을 위해 cell counting kit-8 (CCK-8) assay를 수행하였고 세포독성이 없는 최대 농도를 $250{\mu}M$로 설정하여 이후 모든 실험을 진행하였다. 리바우디오사이드 A의 염증 조절 기능 연구는 주로 정량적 real-time RT-PCR 방법을 이용하였다. LPS에 의해 활성화된 RAW264.7 대식세포에서 리바우디오사이드 A 처리 결과 LPS 처리군 대비 iNOS 발현량은 약 47% 감소하였고, COX-2 또한 41% 감소하였다. 생성된 NO의 양 또한 농도 의존적으로 감소하였다. 대식세포를 LPS로 활성화시킨 조건에서 염증 관련 사이토카인 유전자인 interleukin (IL)-$1{\alpha}$, IL-$1{\beta}$, IL-6의 발현량 조절을 확인한 결과 사이토카인(IL-$1{\alpha}$, $1{\beta}$, 6) 발현이 LPS 처리군 대비 40%, 45%, 59%로 농도 의존적 유의성 있게 감소하였다. 결론적으로 스테비올 배당체인 리바우디오사이드 A는 NO 생성 및 사이토카인 분비 억제를 통해 염증 반응을 저해하였다. 이러한 리바우디오사이드 A의 신규 항염증 조절 기능을 통해 아토피성피부염 개선 소재로의 개발이 기대된다.