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Jeongmin Lee,Sangwook Lee,Wooram Jung,Guk Bae Kim,Taehun Kim,Jiwon Seong,장혜민,Young Noh,Na Kyung Lee,Boo Rak Lee,Jung-Il Lee,Soo Jin Choi,Wonil Oh,Namkug Kim,Seunghoon Lee,Duk L. Na 대한의학회 2022 Journal of Korean medical science Vol.37 No.31
Background: To deliver therapeutics into the brain, it is imperative to overcome the issue of the blood-brain-barrier (BBB). One of the ways to circumvent the BBB is to administer therapeutics directly into the brain parenchyma. To enhance the treatment efficacy for chronic neurodegenerative disorders, repeated administration to the target location is required. However, this increases the number of operations that must be performed. In this study, we developed the IntraBrain Injector (IBI), a new implantable device to repeatedly deliver therapeutics into the brain parenchyma. Methods: We designed and fabricated IBI with medical grade materials, and evaluated the efficacy and safety of IBI in 9 beagles. The trajectory of IBI to the hippocampus was simulated prior to surgery and the device was implanted using 3D-printed adaptor and surgical guides. Ferumoxytol-labeled mesenchymal stem cells (MSCs) were injected into the hippocampus via IBI, and magnetic resonance images were taken before and after the administration to analyze the accuracy of repeated injection. Results: We compared the planned vs. insertion trajectory of IBI to the hippocampus. With a similarity of 0.990 ± 0.001 (mean ± standard deviation), precise targeting of IBI was confirmed by comparing planned vs. insertion trajectories of IBI. Multiple administrations of ferumoxytol-labeled MSCs into the hippocampus using IBI were both feasible and successful (success rate of 76.7%). Safety of initial IBI implantation, repeated administration of therapeutics, and long-term implantation have all been evaluated in this study. Conclusion: Precise and repeated delivery of therapeutics into the brain parenchyma can be done without performing additional surgeries via IBI implantation.
Lee, Seunghoon,Lee, Hyeonhoon,Cho, Yeeun,Kim, Jihye,Kang, Jung Won,Seo, Byung-Kwan,Baek, Yong-Hyeon,Lee, Jae-Dong Wolters Kluwer Health 2018 Medicine Vol.97 No.38
<P><B>Abstract</B></P><P><B>Background:</B></P><P>This study aims to evaluate the efficacy, safety, and appropriate dose of Hanslim, a Korean traditional herbal medicine, for obese patients, when compared to a placebo.</P><P><B>Methods/design:</B></P><P>This study is a randomized, double-blinded, multicenter, multidose, placebo-controlled, phase IIb clinical trial. A total of 165 obese patients with a body mass index (BMI) of more than 30 kg/m<SUP>2</SUP> or obese patients with a BMI of 27 to 29.9 kg/m<SUP>2</SUP> and one or more risk factors such as hypertension, diabetes, or hyperlipidemia will be enrolled. Participants will be randomly assigned to 1 of 3 groups (high-dose, low-dose, or placebo) with a 1:1:1 allocation ratio and will have 4 scheduled visits during the 12-week treatment period. The participants will be administered 2 tablets of Hanslim or placebo, 2 times per day. The difference in the proportion of participants who lost weight by more than 5% from their baseline at 12 weeks compared to the placebo group will be examined as the primary efficacy outcome. Secondary efficacy outcomes include differences in body weight, BMI, body-fat percentage, fat mass, skeletal-muscle mass, edema index, waist circumference, hip circumference, waist-hip ratio, serum lipid, blood glucose, C-reactive protein, and total score of Korean version of obesity-related quality of life after 12 weeks of treatment. Adverse events, laboratory test results, vital sings, and electrocardiography will be recorded to evaluate safety.</P><P><B>Discussion:</B></P><P>This is the first prospective clinical trial to explore the efficacy and safety of Hanslim for obese patients. If the results provide the appropriate dosage of Hanslim, this study would contribute to the confirmatory evidence for the use of Hanslim as a treatment for obesity needed to conduct a large-scale, phase III clinical trial. The results will be published in a peer-reviewed journal.</P><P>Trial registration: Clinical Research Information Service, ID: KCT0002193. Registered on January 6, 2017. https://cris.nih.go.kr/cris/search/search_result_st01_en.jsp?seq=7468</P>
Beneficial effects of melatonin on stroke-induced muscle atrophy in focal cerebral ischemic rats
Seunghoon Lee,Jinhee Shin,Yunkyung Hong,Minkyung Lee,Koo Kim,Sang-Rae Lee,Kyu-Tae Chang,Yonggeun Hong 한국실험동물학회 2012 Laboratory Animal Research Vol.28 No.1
Muscle atrophy is the result of two opposing conditions that can be found in pathological or diseased muscles: an imbalance in protein synthesis and degradation mechanisms. Thus, we investigated whether exogenous melatonin could regulate muscle components in stroke-induced muscle atrophy in rats. Comparing muscle phenotypes, we found that long-term melatonin administration could influence muscle mass. Muscle atrophy-related genes, including muscle atrophy F-box (MAFbx) and muscle ring finger 1 (MuRF1) were significantly down-regulated in melatonin-administered rats in the gastrocnemius. However, only MAFbx at the mRNA level was attenuated in the soleus of melatonin-administered rats. Insulin-like growth factor-1 receptor (IGF-1R) was significantly over-expressed in melatonin-administered rats in both the gastrocnemius and soleus muscles. Comparing myosin heavy chain (MHC) components, in the gastrocnemius, expression of both slow- and fast-type isoforms were significantly enhanced in melatoninadministered rats. These results suggest that long-term exogenous melatonin administration may have a prophylactic effect on muscle atrophy through the MuRF1/MAFbx signaling pathway, as well as a potential therapeutic effect on muscle atrophy through the IGF-1-mediated hypertrophic signaling pathway in a stroke animal model.
Lee, Seunghoon,Hong, Jong Wook,Lee, Su-Un,Lee, Young Wook,Han, Sang Woo The Royal Society of Chemistry 2015 Chemical communications Vol.51 No.42
<P>A facile aqueous synthesis method for the preparation of Au nanoparticle clusters by the controlled galvanic replacement of Ag nanoparticles with Au precursors is described. The prepared clusters showed both significantly enhanced surface-enhanced Raman scattering activity and stability.</P> <P>Graphic Abstract</P><P>Au nanoparticle clusters were prepared by fine control over the galvanic replacement of Ag nanoparticles with Au precursors. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c4cc10377g'> </P>
Development of a Physical Therapy System for Enhancement of Balance Ability
Seunghoon Lee,Younggeun Choi,Hyewon Lee,Wonsup Lee,Taekho You,Myounghwan Ko,Jongkwan Park,Minjung You,Heecheon You 대한인간공학회 2013 대한인간공학회 학술대회논문집 Vol.2013 No.10
Objective: 본 연구는 노인이나 편마비 환자 등의 균형능력을 평가하고 균형장애를 치료할 수 있는 기능성 게임 기반 물리치료 시스템을 개발하고자 한다. Background: 기존 물리치료 방법은 단순하고 지루한 동작을 반복 수행하는 것으로서 환자의 재활의지를 저하시킬 여지가 있으므로, 효과적인 물리치료를 위해 치료동기 및 흥미를 유발시키는 방법이 요구된다. 기존 균형장애의 평가는 임상의의 주관적 판단에 의하여 이루어지고 있으며 정량적 평가 체계가 미흡한 실정이다. Method: 본 연구는 국내외 선행 연구 조사, 기존 제품 조사, 그리고 전문가 자문을 통해 기존 균형훈련 물리치료 시스템의 문제를 파악하고 새로운 아이디어를 제안하였다. 제안된 아이디어는 실용성 및 임상효과 측면에서 평가되었으며, 최종 제품 concept이 도출되었다. Results: 본 연구를 통해 개발된 기능성 게임 기반의 균형훈련 물리치료 시스템 아이디어는 사용성, 만족도, 임상적 활용성, 치료효과 측면에서 보다 효과적인 균형훈련 방법을 제공할 것으로 기대된다. Conclusion: 본 연구에서 개발될 신체균형능력 향상을 위한 기능성 게임 물리치료 시스템은 기존의 물리치료 장비들과 비교하여 치료의 효율 측면에서 우수한 효과가 기대된다. 또한, 가정에서도 치료사 없이 손쉽고 재미있게 자가 치료를 진행할 수 있어 지속적 치료가 가능하다. Application: 제안된 균형훈련 물리치료 시스템 아이디어는 재활의학센터, 요양원, 그리고 가정 등에서 사용될 수 있도록 상용장비로 개발되고 있으며, 시제품이 개발되면 균형장애환자를 대상으로 사용성 및 임상적 활용성 등이 평가될 예정이다.
Numerical modeling of wind turbine aerodynamic noise in the time domain
Lee, Seunghoon,Lee, Seungmin,Lee, Soogab Acoustical Society of America 2013 JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA - Vol.133 No.2
<P>Aerodynamic noise from a wind turbine is numerically modeled in the time domain. An analytic trailing edge noise model is used to determine the unsteady pressure on the blade surface. The far-field noise due to the unsteady pressure is calculated using the acoustic analogy theory. By using a strip theory approach, the two-dimensional noise model is applied to rotating wind turbine blades. The numerical results indicate that, although the operating and atmospheric conditions are identical, the acoustical characteristics of wind turbine noise can be quite different with respect to the distance and direction from the wind turbine.</P>