• 대한약학회:학술대회논문집
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• 대한약학회 2002년도 Proceedings of the Convention of the Pharmaceutical Society of Korea Vol.2
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• pp.379.2-379.2
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• 2002

Angelicae tenuissimae ia a plant often used in traditional Korean medicine. It has been used as analgesic. antipyretic and anti-inflammatory agent. However its component and precise modes of neuropharmacological action have not been reported. In the present study, we investigated the protective effects of A. tenuissimae and it's component on ischemic damage induced by oxygen and glucose deprivation in rat hippocampal slice. (omitted)

• Korean Journal of Radiology
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• 제25권4호
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• pp.374-383
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• 2024

Objective: To evaluate the diagnostic performance and image quality of 1.5-mm slice thickness MRI with deep learningbased image reconstruction (1.5-mm MRI + DLR) compared to routine 3-mm slice thickness MRI (routine MRI) and 1.5-mm slice thickness MRI without DLR (1.5-mm MRI without DLR) for evaluating temporal lobe epilepsy (TLE). Materials and Methods: This retrospective study included 117 MR image sets comprising 1.5-mm MRI + DLR, 1.5-mm MRI without DLR, and routine MRI from 117 consecutive patients (mean age, 41 years; 61 female; 34 patients with TLE and 83 without TLE). Two neuroradiologists evaluated the presence of hippocampal or temporal lobe lesions, volume loss, signal abnormalities, loss of internal structure of the hippocampus, and lesion conspicuity in the temporal lobe. Reference standards for TLE were independently constructed by neurologists using clinical and radiological findings. Subjective image quality, signal-to-noise ratio (SNR), and contrast-to-noise ratio (CNR) were analyzed. Performance in diagnosing TLE, lesion findings, and image quality were compared among the three protocols. Results: The pooled sensitivity of 1.5-mm MRI + DLR (91.2%) for diagnosing TLE was higher than that of routine MRI (72.1%, P < 0.001). In the subgroup analysis, 1.5-mm MRI + DLR showed higher sensitivity for hippocampal lesions than routine MRI (92.7% vs. 75.0%, P = 0.001), with improved depiction of hippocampal T2 high signal intensity change (P = 0.016) and loss of internal structure (P < 0.001). However, the pooled specificity of 1.5-mm MRI + DLR (76.5%) was lower than that of routine MRI (89.2%, P = 0.004). Compared with 1.5-mm MRI without DLR, 1.5-mm MRI + DLR resulted in significantly improved pooled accuracy (91.2% vs. 73.1%, P = 0.010), image quality, SNR, and CNR (all, P < 0.001). Conclusion: The use of 1.5-mm MRI + DLR enhanced the performance of MRI in diagnosing TLE, particularly in hippocampal evaluation, because of improved depiction of hippocampal abnormalities and enhanced image quality.

• 스마트미디어저널
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• 제5권1호
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• pp.44-48
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• 2016

장기추적 뇌영상 연구에서 자기공명영상장치의 노후 또는 기술 발전에 따른 업그레이드로 인해 연구기간 내 동일한 촬영 조건을 유지하기 어렵다. 특히, 자장 세기가 1.5T에서 3T로 증가한 경우가 많아, 기존 1.5T 영상을 새로운 3T 영상과 통합해서 분석에 사용하는 것이 가능한지 확인할 필요가 있다. 본 논문에서는 자장 세기와 스캔 방향이 다른 자기공명영상에서 측정한 해마 체적의 재현성을 연구 분석하였다. 실험참가자 296명의 3차원 T1 영상을 1.5와 3T 자기공명영상장치 각각에서 스캔 방향을 달리하여 획득하고 뇌영상 연구에 널리 사용되는 Freesurfer를 이용하여 실험참가자의 해마 체적을 측정하였다. 해마 체적의 영상종류 간 차이를 확인하기 위해 대응표본t-검정을 수행한 결과, 자기공명영상장치의 자장 세기와 스캔 방향에 따라 해마체적이 유의하게 차이가 있음을 확인하였다. 이런 결과는 촬영조건에 따라 측정된 해마체적이 달라질 수 있음을 의미하므로, 촬영 조건이 다른 영상을 통합 분석할 수 있는 기법의 개발이 필요하다고 판단된다.

• 대한약학회:학술대회논문집
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• 대한약학회 2002년도 Proceedings of the Convention of the Pharmaceutical Society of Korea Vol.1
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• pp.107.1-107.1
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• 2002

• 한국감성과학회:학술대회논문집
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• 한국감성과학회 2009년도 추계학술대회
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• pp.190-192
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• 2009

Kainic acid (KA), an agonist for kainate and AMPA receptors, is an excitatory neurotoxic substance. Vitamin E such as alpha-tocopherol and alpha-tocotrienol is a chain-breaking antioxidant, preventing the chain propagation step during lipid peroxidation. In the present study, we have investigated the neuroprotective effects of alphatocopherol and alpha-tocotrienol on KA-induced neuronal death using organotypic hippocampal slice culture (OHSC). After 15h KA treatment, delayed neuronal death was detected in CA3 region. Alpha-tocopherol and alpha-tocotrienol increased cell survival and reduced the number of TUNEL-positive cells in CA3 region. These data suggest that alpha-tocopherol and alpha-tocotrienol treatment have protective effects on KA-induced cell death

• 한국감성과학회:학술대회논문집
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• 한국감성과학회 2008년도 추계학술대회
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• pp.147-150
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• 2008

Vitamin C ascorbic acid (AA) and dehydroascorbic acid (DHA) as an antioxidant have been shown to have protective effects in experimental neurological disorder models such as stroke, ischemia, and epileptic seizures. The present study was conducted to examine the protective effect of AA and DHA on Kainic acid (KA) neurotoxicity using organotypic hippocampal slice cultures (OHSC). After 12h KA treatment, significant delayed neuronal death was detected in CA3 region, but not in CA1. Intermediate dose of AA and DHA pretreatment significantly prevented cell death and inhibit ROS level, mitochondrial dysfunction and capase-3 activation in CA3 region. In the case of low or high dose, however, AA or DHA pretreatment were not effective. These data suggest that both AA and DHA pretreatment have neuroprotective effects on KA-induced neuronal injury depending on the concentration, by means of inhibition of ROS generation, mitochondrial dysfunction, and caspase-dependent apoptotic pathway.

• Clinical and Experimental Pediatrics
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• 제52권5호
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• pp.588-593
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• 2009

목 적 : 산소-포도당 박탈(oxygen-glucose deprivation, OGD)에 노출된 신생 흰쥐 해마 절편에서 성장호르몬이 신경 세포 보호 효과가 있는지를 연구하고자 하였다. 방 법 : 배양된 생후 7일된 신생 흰쥐의 해마 절편을 OGD에 60분간 노출 시켰다. 이후 각기 다른 세 용량의 성장 호르몬(5, 50, $500{\mu}M$)을 배양액에 투여하고 OGD 노출 후 12 와 24시간에 해마 절편의 상대적 propidium iodide (PI) uptake와 배양액의 상대적 lactate dehydrogenase (LDH) 활성도를 측정하여 성장 호르몬 처치군과 성장 호르몬 처치하지 않은 대조군 사이에 비교하였다. 신경 세포의 세포 사멸에 대한 성장호르몬의 효과를 관찰하고자 caspase-3의 면역 형광 염색과 TUNEL 염색을 시행하였다. 결 과 : 1) 각기 다른 세 용량의 성장호르몬을 처치한 해마 절편의 CA1과 DG에서 상대적 PI uptake는 처치하지 않은 대조군에 비해 OGD 노출 후 12시간과 24시간에 의미 있는 차이를 보이지 않았다(P>0.05). 2) 상대적 LDH 활성도는 OGD 노출 후 12시간에만 성장 호르몬을 투여한 군의 배양액에서 대조군에 비해 통계적으로 의미 있게 감소하였다(P<0.05). 3) 성장 호르몬($50{\mu}M$)으로 처치한 해마 절편의 CA1과 DG에서 caspase-3 발현과 TUNEL 양성의 발현은 OGD 노출 후 12와 24시간에 대조군과 차이를 보이지 않았다. 결 론 : OGD에 노출된 해마 절편에서 성장호르몬 처치는 확실한 신경세포 보호 효과를 보이지 않았으나 OGD 노출 후 12시간에 배양액으로 LDH 유출을 감소시킬 수 있었다.

• 한국생물물리학회:학술대회논문집
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• 한국생물물리학회 2001년도 학술 발표회 진행표 및 논문초록
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• pp.53-53
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• 2001

When repolarization of neuronal action potential does not decline monotonically but interrupted by additional depolarization, this prolonged depolarization phase is referred to afterdepolarization(ADP). ADP is considered to playa crucial role in the modulation of neuronal excitability, since it contributes to burst firing. We studied the ionic mechanisms underlying ADP in the soma of dentate granule cells, using rat hippocampal slice (300${\mu}{\textrm}{m}$ in thickness) prepared from 3- to 3-week-old SD rats.(omitted)

• The Korean Journal of Physiology and Pharmacology
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• 제22권3호
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• pp.249-255
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• 2018

Echinacoside, an active compound in the herb Herba Cistanche, has been reported to inhibit glutamate release. In this study, we investigated the effects of echinacoside on spontaneous excitatory synaptic transmission changes induced by 4-aminopyridine (4-AP), by using the in vitro rat hippocampal slice technique and whole-cell patch clamp recordings from CA3 pyramidal neurons. Perfusion with echinacoside significantly suppressed the 4-AP-induced epileptiform activity in a concentration-dependent manner. Echinacoside reduced 4-AP-induced increase in frequency of spontaneous excitatory postsynaptic currents (sEPSCs) but it did not affect the amplitude of sEPSCs or glutamate-activated currents, implicating a presynaptic mechanism of action. Echinacoside also potently blocked sustained repetitive firing, which is a basic mechanism of antiepileptic drugs. These results suggest that echinacoside exerts an antiepileptic effect on hippocampal CA3 pyramidal neurons by simultaneously decreasing glutamate release and blocking abnormal firing synchronization. Accordingly, our study provides experimental evidence that echinacoside may represent an effective pharmacological agent for treating epilepsy.

• 한국응용약물학회:학술대회논문집
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• 한국응용약물학회 2004년도 Annual Meeting of the Korean Society ofApplied Pharmacology
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• pp.124-128
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• 2004

We have assessed amyloid ${\beta}-peptide$ $(A{\beta})-induced$ neurotoxicity in primary neurons and organotypic hippocampal slice cultures (OHC) in rat. Exposing cultured hippocampal and cerebellar granule neurons to $A{\beta}$ resulted in a decrease of MTT reduction, and in destruction of neuronal integrity. Treatment of these neurons with tunicamycin, an inhibitor of N-glycosylation in the endoplasmic reticulum (ER), also decreased MTT reduction in these neurons. S-allyl-L-cysteine (SAC), an active organosulfur compound in aged garlic extract, protected hippocampal but not cerebellar granule neurons against $A{\beta}$- or tunicamycin-induced toxicity. In the hippocampal neurons, protein expressions of casapse-12 and GRP 78 were significantly increased after $A{\beta}_{25-35}$ or tunicamycin treatment. The increase in the expression of caspase-12 was suppressed by simultaneously adding $1{\mu}M$ SAC in these neurons. In contrast, in the cerebellar granule neurons, the expression of caspase-12 was extremely lower than that in the hippocampal neurons, and an increase in the expression by $A{\beta}_{25-35}$ or tunicamycin was not detected. In OHC, ibotenic acid (IBO), a NMDA receptor agonist, induced concentration-dependent neuronal death. When $A{\beta}$ was combined with IBO, there was more intense cell death than with IBO alone. SAC protected neurons in the CA3 area and the dentate gyrus (DG) from the cell death induced by IBO in combination with $A{\beta}$, although there was no change in the CA1 area. Although protein expression of casapse-12 in the CA3 area and the DG was significantly increased after the simultaneous treatment of AI3 and IBO, no increase in the expression was observed in the CA1 area. These results suggest that SAC could protect against the neuronal cell death induced by the activation of caspase-12 in primary cultures and OHC. It is also suggested that multiple mechanisms may be involved in neuronal death induced by AI3 and AI3 in combination with IBO.