사람 흉선 내 T-세포에서 발현하는 발생분화단계 특이적 ESTs에 관한 genomic analysis

Thesis (doctoral)--서울대학교 대학원 :생물학과,1999.Docto

Effects of aspirin and clopidogrel on neural stem cells

Cerebral infarction causes severe morbidity and mortality. Most patients with cerebral infarction should take antiplatelet drugs daily, so the effects of those drugs on the regeneration of the brain need to be investigated. Aspirin and clopidogrel are the most widely used antiplatelet drugs for the prevention of ischemic stroke. We investigated the effects of aspirin and clopidogrel on neural stem cells (NSCs). NSCs were dissociated from fetal rat cortex and cultured with basic fibroblast growth factor and N2 medium. To measure the effects of aspirin and clopidogrel on NSCs, NSCs were treated with several concentrations of aspirin, clopidogrel bisulfate, and clopidogrel resinate for 24 h. After the treatment, we measured cell viability by cell counting kit-8, MIT (3-[4,5-dimethylthiazol-2-yl]-2,5-diphenyltetrazolium bromide) assay, trypan blue staining, flow cytometry, and lactate dehydrogenase assay. To evaluate their effects on NSC proliferation, we performed BrdU cell proliferation assay and colonyforming unit assay. We compared the intracellular protein level in the NSCs treated with aspirin and two types of clopidogrel, by proteomics analysis. Various viability tests showed that clopidogrel resinate and clopidogrel bisulfate did not affect the viability and proliferation of NSCs whereas aspirin decreased them even at low concentrations which are clinically relevant. Moreover, through the proteomics, it was confirmed that the toxicity of aspirin to NSCs might be associated with the alteration of several intracellular proteins. Taken together, these results suggest that clopidogrel resinate and clopidogrel bisulfate are safe but aspirin could be toxic to NSCs. Therefore, when these antiplatelet agents are prescribed over the long-term, the finding that aspirin could be toxic to NSCs should be considered.This work was supported by the Basic Science Research Program of the National Research Foundation of Korea funded by the Ministry of Science, ICT and Future Planning (2015R1A2A2A04004865), by a grant of the Korea Health Technology R&D Project through the Korea Health Industry Development Institute (KHIDI), funded by the Ministry of Health & Welfare, Republic of Korea (grant number: HI17C2160), and by Korea Drug Development Fund (KDDF) funded by Ministry of Science and ICT, Ministry of Trade, Industry & Energy and Ministry of Health & Welfare (KDDF-201609-02, Republic of Korea)

β-글로빈 유전자군과 미토콘드리아 DNA 조절부위에 대한 한국인집단의 분자유전학적 특성

학위논문(석사)--서울대학교 대학원 :생물학과,1995.Maste

Differences in Therapeutic Responses and Factors Affecting Post-Stroke Depression at a Later Stage According to Baseline Depression

Background and Purpose The pathophysiology of post-stroke depression (PSD) is complex and may differ according to an individual's mood immediately after stroke. Here, we compared the therapeutic response and clinical characteristics of PSD at a later stage between patients with and without depression immediately after stroke.Methods This study involved a post hoc analysis of data from EMOTION (ClinicalTrials.gov NCT01278498), a placebo-controlled, double-blind trial that examined the efficacy of escitalopram (10 mg/day) on PSD and other emotional disturbances among 478 patients with acute stroke. Participants were classified into the Baseline-Blue (patients with baseline depression at the time of randomization, defined per the Montgomery-Asberg Depression Rating Scale [MADRS]>= 8) or the Baseline-Pink groups (patients without baseline depression). We compared the efficacy of escitalopram and predictors of 3-month PSD (MADRS >=) between these groups.Results There were 203 Baseline-Pink and 275 Baseline-Blue patients. The efficacy of escitalopram in reducing PSD risk was more pronounced in the Baseline-Pink than in the Baseline-Blue group (P for interaction=0.058). Several risk factors differentially affected PSD development based on the presence of baseline depression (P for interaction <0.10). Cognitive dysfunction was an independent predictor of PSD in the Baseline-Blue, but not in the Baseline-Pink group, whereas the non-use of escitalopram and being female were more strongly associated with PSD in the Baseline-Pink group.Conclusions Responses to escitalopram and predictors of PSD 3 months following stroke differed based on the presence of baseline depression. Our data suggest that PSD pathophysiology is heterogeneous; therefore, different therapeutic strategies may be needed to prevent PSD emergence following stroke.This study was supported by the Ministry for Health, Welfare, and Family Affairs, Republic of Korea (HI14C1985)