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Shin, Kyungha,Cha, Yeseul,Kim, Kwang Sei,Choi, Ehn-Kyoung,Choi, Youngjin,Guo, Haiyu,Ban, Young-Hwan,Kim, Jong-Choon,Park, Dongsun,Kim, Yun-Bae Hindawi Publishing Corporation 2016 Behavioural neurology Vol.2016 No.-
<P>Amygdala is involved in the fear memory that recognizes certain environmental cues predicting threatening events. Manipulation of neurotransmission within the amygdala affects the expression of conditioned and unconditioned emotional memories such as fear freezing behaviour. We previously demonstrated that F3.ChAT human neural stem cells (NSCs) overexpressing choline acetyltransferase (ChAT) improve cognitive function of Alzheimer's disease model rats with hippocampal or cholinergic nerve injuries by increasing acetylcholine (ACh) level. In the present study, we examined the effect of F3.ChAT cells on the deficit of unconditioned fear freezing. Rats given N-methyl-<SMALL>D</SMALL>-aspartate (NMDA) in their amygdala 2 weeks prior to cat odor exposure displayed very short resting (freezing) time compared to normal animals. NMDA induced neuronal degeneration in the amygdala, leading to a decreased ACh concentration in cerebrospinal fluid. However, intracerebroventricular transplantation of F3.ChAT cells attenuated amygdala lesions 4 weeks after transplantation. The transplanted cells were found in the NMDA-injury sites and produced ChAT protein. In addition, F3.ChAT-receiving rats recuperated freezing time staying remote from the cat odor source, according to the recovery of brain ACh concentration. The results indicate that human NSCs overexpressing ChAT may facilitate retrieval of unconditioned fear memory by increasing ACh level.</P>
Blood flow-improving activity of methyl jasmonate-treated adventitious roots of mountain ginseng
Young-Hwan Ban,Yeseul Cha,Jieun Choi,Eun Suk An,Ji Young Lee,Nu Ry Han,Da Woom Seo,Gooyoung Jung,Da-Hye Jeong,Man Hee Rhee,Ehn-Kyoung Choi,Yun-Bae Kim 한국실험동물학회 2017 Laboratory Animal Research Vol.33 No.2
Ginsenosides from Panax ginseng are well known for their diverse pharmacological effects including antithrombotic activity. Since adventitious roots of mountain ginseng (ARMG) also contain various ginsenosides, blood flow-improving effects of the dried powder and extract of ARMG were investigated. Rats were orally administered with dried powder (PARMG) or ethanol extract (EARMG) of ARMG (125, 250 or 500 mg/kg) or aspirin (30 mg/kg, a reference control) for 3 weeks. Forty min after the final administration, carotid arterial thrombosis was induced by applying a 70% FeCl3-soaked filter paper outside the arterial wall for 5 min, and the blood flow was monitored with a laser Doppler probe. Both PARMG and EARMG delayed the FeCl3-induced arterial occlusion in a dose-dependent manner, doubling the occlusion time at high doses. In mechanism studies, a high concentration of EARMG inhibited platelet aggregation induced by collagen in vitro. In addition, EARMG improved the blood lipid profiles, decreasing triglyceride and cholesterol levels. Although additional action mechanisms remain to be clarified, it is suggested that ARMG containing high amount of ginsenosides such as Rg3 improves blood flow not only by inhibiting oxidative thrombosis, but also by modifying blood lipid profiles.
Broccoli sprout extracts improve alcoholic gastric ulcers via antioxidative activities
YOUNG-HWAN BAN,YESEUL CHA,HAIYU GUO,JIEUN CHOI,EUN SUK AN,JI YOUNG LEE,NU RY HAN,EUN SU JEON,EUN SANG CHO,DA WOOM SEO,JUNG-MIN YON,TAE-SU KIM,SUNG-PYO LEE,EHN-KYOUNG CHOI,YUN-BAE KIM 한국실험동물학회 2016 한국실험동물학회 학술발표대회 논문집 Vol.2016 No.08
박정은(Jeongeun Park),강효찬(Hyochan Kang),강예슬(Yeseul Kang),차범석(Beomseok Cha),박진수(Jinsoo Park) 대한기계학회 2023 대한기계학회 춘추학술대회 Vol.2023 No.11
Acoustomicrofluidic chips are being applied in various fields, including drug screening, because of their ability to control microscale heat transfer and manipulate floating objects. Acoustomicrofluidic chips can be used as disposable by attaching a PDMS film underneath the channel instead of permanently attaching an electrode and a channel. This approach is considered cost-effective and helps prevent contamination of channels. However, the conversion of acoustic energy into thermal energy occurs as a result of absorption caused by the viscoelasticity of PDMS. This phenomenon leads to changes in the properties of the fluid or particles. Therefore, a quantitative analysis of the absorption of acoustic waves by PDMS is necessary. This study investigates the relationship between the absorption characteristics and the thickness of the PDMS membrane through thermal measurement experiments using an infrared camera. This is validated by the results of flow mixing using acoustic streaming flow.