• 한국자원식물학회지
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• 제26권6호
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• pp.678-685
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• 2013

The objective of this study was to examine the effect of 7 traditional Korean formulations (7TKFs) on intimal thickening of rat carotid artery injured by balloon catheter in vivo and on the proliferation of human smooth muscle cells (HASMCs) and secretion of matrix metalloproteinase-2 (MMP-2) in vitro. 7TKFs (400 mg/kg) were administered orally for 4 weeks from the day of balloon injury in the rats. HASMC proliferation was assessed by 3-(4,5-dimethylthiazol-2)-2,5-diphenyltetrazolium bromide (MTT) assay while enzymatic action of MMP-2 was carried out by gelatin zymography. Among 7TKFs, Samhwang-sasim-tang (SST), Banha-sasim-tang (BST) and Kegi-honghwa-tang (KHT) significantly reduced the intimal thickening by suppressing HASMC proliferation and MMP-2 expression in both extracellular and intracellular levels. Thus, the results suggest that SST, BST and KHT can be considered as a therapeutic value in the prevention of atherosclerosis because restenosis after PTCA (percutaneous transluminal coronary angioplasty) is supposed to be 'accelerated atherosclerosis'.

• 한국응용약물학회:학술대회논문집
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• 한국응용약물학회 2003년도 Annual Meeting of KSAP : International Symposium on Pharmaceutical and Biomedical Sciences on Obesity
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• pp.100-100
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• 2003

We have reported that oral administration of Saiko-Ka-Ryukotsu-Borei-To (SRB), a traditional Chinese formulation, inhibited the intimal thickening in carotid artery after balloon injury in cholesterol-fed rats. To elucidate its mechanism, the effects of SRB on migration and proliferation of vascular smooth muscle cell (VSMC) were examined in vivo and in vitro. We have reported that oral administration of Saiko-ka-Ryukotsu-Borei-To (SRB), a traditional Chinese formulation, inhibited the intimal thickening in carotid artery after balloon injury in cholesterol-fed rats. To elucidate its mechanism, the effects of SRB on migration and proliferation of vascular smooth muscle cell (VSMC) were examined in vivo and in vitro.

• Bulletin of the Korean Chemical Society
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• 제25권7호
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• pp.1003-1008
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• 2004

A novel class of alkoxybenzylcyanoguanidine analogs as the inhibitors of restenosis was discovered, which showed the inhibitory effects on angiotensin II-induced cell proliferation, determined by $[^3H]$thymidine incorporation method. The compound, N'-(4-nitrophenyl)guanidine analog 19, showed 62% inhibition of $[^3H]$thymidine incorporation at 1 ${\mu}M$ concentration. In addition, the compound 19 inhibited intimal thickening dose-dependently after balloon injury, which suggests the therapeutic potential for restenosis.

• 대한약학회:학술대회논문집
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• 대한약학회 2003년도 Proceedings of the Convention of the Pharmaceutical Society of Korea Vol.2-2
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• pp.207.3-208
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• 2003

Objectives:We have reported that oral administration of Saiko-ka-Ryukotsu-Borei-To (SRB), a traditional Chinese formulation, inhibited the intimal thickening in carotid artery after balloon injury in cholesterol-fed rats. To elucidate its mechanism, the effects of SRB on migration and proliferation of vascular smooth muscle cell (VSMC) were examined in vivo and in vitro.Methods: ＜ In vivo-study＞ Rats were fed on diet containing 1% cholesterol and SRB 3 days before and 4 days after denudation. Simvastatin was used as a positive control. (omitted)

• Journal of Yeungnam Medical Science
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• 제1권1호
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• pp.107-113
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• 1984

인간(人間)의 생활(生活)과 밀접(密接)한 관계(關係)가 있고 또 고혈압(高血壓)과도 불가분(不可分)의 관계(關係)가 있고 염분(鹽分)이 신동맥의 형태학적(形態學的) 변화(變化)에 미치는 영향(影響)을 연구관찰(硏究觀察)하기 위(爲)하여 백서(白鼠)를 실험동물(實驗動物)로 하여 통상(通常)의 동물사료(動物飼料)에 0.06%의 식염(食鹽)을 혼합투여(混合投與)한 대조군(對照群), 2.0%의 식염(食鹽)을 혼합(混合)한 저염분투여군(低鹽分投與群), 그리고 8.0%의 식염(食鹽)을 혼합투여(混合投與)한 고식염군(高食鹽群)으로 나누어 사육(飼育)하면서 실험시작(實驗始作) 2주후(週後)부터 2주간격(週間隔)으로 각군(各群)에서 3마리씩 도살(屠殺)하여 신동맥에 야기(惹起)된 병변(病變)을 관찰(觀察)하여 다음과 같은 결과(結果)를 얻었다. 대조군(對照群)에 있어서는 실험(實驗)16주차(週次)부터 신동맥의 내막(內膜)에 경미(輕微)한 비후성변화(肥厚性變化)를 초래(招來)하였으나 실험종료(實驗終了)인 20주(週)에도 그 정도(程度)는 경(輕)하였다. 저염분투여군(低鹽分投與群)에서는 실험(實驗)12주경(週頃)부터 경미(輕微)한 내막(內膜)의 비후성변화(肥厚性變化)를 관찰(觀察)할 수 있었으나 실험종료(實驗終了)인 20주(週)에도 그 정도(程度)는 역시 경(輕)하였다. 고염분투여군(高鹽分投與群)에서는 실험(實驗) 6주(週)부터 경미(輕微)한 내막(內膜)의 비후(肥厚)를 초래(招來)하여 그 정도(程度)가 경시적(經時的)으로 점차(漸次) 심(甚)해져서 실험종료시(實驗終了時)에는 내막비후(內膜肥厚)는 중등도(中等度) 내지(乃至) 고도(高度)로 관찰(觀察)되었으며 중막(中膜)의 비후(肥厚)나 동맥의 내막(內膜) 또는 중막(中膜)의 변성(變性)도 그 정도(程度)는 경(輕)하지만 관찰(觀察)할 수 있었다.

• Journal of Korean Neurosurgical Society
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• 제64권5호
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• pp.693-704
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• 2021

Objective : Endovascular mechanical thrombectomy (MT) has been regarded as one of the standard treatments for acute ischemic stroke caused by large vessel occlusion. Despite the wide use of stent retrievers for MT, arterial intimal damage caused when deployed stent is pulled has been a certain disadvantage. We hypothesized that statin could protect and stabilize vessel damage after endovascular MT using a stent retriever. In this animal study, we observed the protective effects of the statins towards MT-induced vessel wall injury. Methods : Twenty-eight carotid arteries of fourteen rabbits were used in the experiments with MT using stent retriever. We divided the rabbits into four groups as follows : group 1, negative control; group 2, positive control; group 3, statin before MT; and group 4, statin after MT. After MT procedures, we harvested the carotid arteries and performed histomorphological and immunohistochemical analyses. Results : In histomorphological analysis with hematoxylin and eosin and Masson's trichrome stain, significant intimal thickening (p<0.05) was observed in the positive control (group 2), compared to in the negative control (group 1). Intimal thickening was improved in the statin-administered groups (groups 3 and 4 vs. group 2, p<0.05). We also observed that statin administration after MT (group 4) resulted in a more effective decrease in intimal thickness than statin administration before MT (group 3) (p<0.05). We performed immunohistochemical analysis with the antibodies for tumor necrosis factor-alpha (TNF-α), cluster of differentiation (CD)11b, and CD163. In contrast to the negative control (group 1), the stained percentage areas of all immunological markers were markedly increased in the positive control (group 2) (p<0.05). Based on statin administration, the percentage area of TNF-α staining was significantly reduced (p<0.05) in group 3, compared to the positive control group (group 2). However, significant differences were not observed for CD11b and CD163 staining. In group 4, no significant differences were observed for TNF-α, CD11b, and CD163 staining (p≥0.05). The differences in the percentage areas of the different markers between the statin-administered groups (groups 3 and 4) were also not revealed. Conclusion : We presented that statin administration before and after MT exerted protective effects towards vessel wall injury. The efficacy of statins was greater post-administration than pre-administration. Thus, statin administration in routine prescriptions in the peri-procedural period is strongly advised.

• 대한의용생체공학회:의공학회지
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• 제17권3호
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• pp.337-346
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• 1996

The patency of small size vascular grafts is poor, and the blood flow characteristics in the artery graft anastomosis are suspected as one of the important factors influencing intimal hyperplasia. Disturbed flow patterns caused by sixte and compliance mismatch generate unfavorable flow environment which promotes intimal thickening. Tapered vascular yuts are suggested in order to reduce sudden expansion near the anastomosis. The photochromic flow visualization method is used to measure the flout fields in the end-to-end anastomosis model under the carotid and femoral artery flow wave form. The results show that flow disturbance near the anastomosis is diminished in the tapered grafts comparing to the tubular graft. As the divergent ang1e decreases, we can reduce the low and oscillatory wall shear stress zone which is prone to intimal hyperplasia. The flow wave form effects the wall shear rate dis- tribution significantly. The steep deceleration and back flow in the femoral flow wAve form cause low mean wall shear rate and high oscillatory shear index.

• Journal of Chest Surgery
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• 제42권2호
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• pp.135-140
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• 2009

배경: 동종이형의 심장이식 후에 나타나는 만성 거부반응은 수술 후 약 6개월이 지나 나타나며, 이로 인해 이식된 심장의 관상동맥의 동맥 경화 소견과 심장의 손상을 일으키는 혈관병증이 나타나는 바, 대혈관인 대동맥에서도 이러한 소견을 보이는 지를 확인하고자 하였다. 대상 및 방법: $200{\sim}300gm$의 백서(Spraque-Dawley Rat)에서 이소성의 동종이형의 심장이식(heterotopic heart alto-transplantation)을 Ono-Lindsey method로 시행한 후 사이클로스포린(cyclosporin A 10mg/kg/day, 종근당 제공)을 투여하여 3개월 이상 생존한 군에서 동물을 희생시킨 후 자가 상행 대동맥과 이식된 심장의 대동맥에서 각각 조직 절편을 얻어 조직 검사를 시행하여 비교하였다. 자가 상행 대동맥의 조직 검사(N=9, native ascending aorta)와 동종 이형의 이식된 심장의 대동맥(N=13, alto-transplanted aorta)의 조직 검사를 동종이형의 심장이식 후의 만성 거부 반응의 특징적인 조직 검사 소견인 1) 내막 비후(intimal thickening), 2) 중층 비후(medial hyperplasia), 3) 중층 석회화(medial calcification), 4) 중층 염증(medial inflammation), 5) 연골 화생(chondroid metaplasia)에 대하여 한 명의 병리의에 의해 대조군과 이식군에서 각각 심한 정도를 통계처리(Mann-Whitney Test, SPSS version 12.0 Windows)하여 비교하였다. 결과: 중층 비후 외(p=0.36)에 내막 비후(p<0.0001), 중층 석회화(p=0.045), 중층 염증(p<0.0001), 연골 화생(p=0.045)에 있어 이식된 심장의 대동맥에서 의미 있는 변화를 보였다. 결론: 동종 이형의 심장 이식 후에 만성 거부 반응에 의한 혈관병증(cardiac allograft vasculopathy)은 관상 동맥을 침범하여 심근의 손상을 가져오며, 이와 같은 만성 거부 반응에 의한 혈관 병증의 변화는 대혈관인 이식된 대동맥에서도 상기의 결과와 같이 나타나 대동맥에서도 만성적인 거부 반응이 진행되고 있음을 확인할 수 있었다.

• Molecules and Cells
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• 제43권8호
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• pp.749-762
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• 2020

The migration, dedifferentiation, and proliferation of vascular smooth muscle cells (VSMCs) are responsible for intimal hyperplasia, but the mechanism of this process has not been elucidated. WD repeat domain 1 (WDR1) promotes actin-depolymerizing factor (ADF)/cofilin-mediated depolymerization of actin filaments (F-actin). The role of WDR1 in neointima formation and progression is still unknown. A model of intimal thickening was constructed by ligating the left common carotid artery in Wdr1 deletion mice, and H&E staining showed that Wdr1 deficiency significantly inhibits neointima formation. We also report that STAT3 promotes the proliferation and migration of VSMCs by directly promoting WDR1 transcription. Mechanistically, we clarified that WDR1 promotes the proliferation and migration of VSMCs and neointima formation is regulated by the activation of the JAK2/STAT3/WDR1 axis.

• Archives of Plastic Surgery
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• 제46권3호
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• pp.214-220
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• 2019

Background Microvascular anastomosis patency is adversely affected by local and systemic factors. Impaired intimal recovery and endothelial mechanisms promoting thrombus formation at the anastomotic site are common etiological factors of reduced anastomosis patency. Epigallocatechin gallate (EGCG) is a catechin derivative belonging to the flavonoid subgroup and is present in green tea (Camellia sinensis). This study investigated the effects of EGCG on the structure of vessel tips used in microvascular anastomoses and evaluated its effects on thrombus formation at an anastomotic site. Methods Thirty-six adult male Wistar albino rats were used in the study. The right femoral artery was cut and reanastomosed. The rats were divided into two groups (18 per group) and were systemically administered either EGCG or saline. Each group were then subdivided into three groups, each with six rats. Axial histological sections were taken from segments 1 cm proximal and 1 cm distal to the microvascular anastomosis site on days 5, 10, and 14. Results Thrombus formation was significantly different between the EGCG and control groups on day 5 (P=0.015) but not on days 10 or 14. The mean luminal diameter was significantly greater in the EGCG group on days 5 (P=0.002), 10 (P=0.026), and 14 (P=0.002). Intimal thickening was significantly higher on days 5 (P=0.041) and 10 (P=0.02). Conclusions EGCG showed vasodilatory effects and led to reduced early thrombus formation after microvascular repair. Similar studies on venous anastomoses and random or axial pedunculated skin flaps would also contribute valuable findings relevant to this topic.