1.Expression of Tonicity-Responsive Enhancer Binding Protein (TonEBP) in the Rat Cochlea: An Immunohistochemical Study.
Yong Sig KWUN ; Sun Woo LIM ; Sang W YEO ; Kyung Hun YANG ; Seung Ho CHOI ; Tae Hyung KIM ; Jin KIM
Korean Journal of Otolaryngology - Head and Neck Surgery 2002;45(5):439-444
BACKGROUND AND OBJECTIVES: The inner ear is an organ used for hearing and balance. For its normal function, the inner ear fluid homeostasis is required. There has been controversy over the regulatory mechanisms of maintaining inner ear fluid balance, and they have not yet been clearly defined. TonEBP is the protein that binds tonicity-responsive enhancer elements in the osmoprotective gene, which elevates the compatible osmolytes, which in turn induces cell survival in hypertonic condition. The aim of this study was to elucidate if there is an osmoregulatory mechanism in cochlea. Material and Method: The localization of TonEBP in the cochlea of male Sprague-Dawley rats was studied by immunohistochemistry with an anti rabbit polyclonal anti-rat TonEBP antibody. RESULTS: TonEBP was expressed at outer hair cells, Deiter cells, spiral ligaments, sprial limbus connective tissues, and epithelial lining of basilar membrane facing scala tympani. CONCLUSION: TonEBP in cochlea is one of the proteins involved in elucidating cell survival in changed tonicity during inner ear homeostasis.
Animals
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Basilar Membrane
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Carrier Proteins*
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Cell Survival
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Cochlea*
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Connective Tissue
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Ear, Inner
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Enhancer Elements, Genetic
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Hair
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Hearing
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Homeostasis
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Humans
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Immunohistochemistry
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Male
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Rats*
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Rats, Sprague-Dawley
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Scala Tympani
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Spiral Ligament of Cochlea
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Water-Electrolyte Balance
2.Aquatide Activation of SIRT1 Reduces Cellular Senescence through a SIRT1-FOXO1-Autophagy Axis.
Chae Jin LIM ; Yong Moon LEE ; Seung Goo KANG ; Hyung W LIM ; Kyong Oh SHIN ; Se Kyoo JEONG ; Yang Hoon HUH ; Suin CHOI ; Myungho KOR ; Ho Seong SEO ; Byeong Deog PARK ; Keedon PARK ; Jeong Keun AHN ; Yoshikazu UCHIDA ; Kyungho PARK
Biomolecules & Therapeutics 2017;25(5):511-518
Ultraviolet (UV) irradiation is a relevant environment factor to induce cellular senescence and photoaging. Both autophagy- and silent information regulator T1 (SIRT1)-dependent pathways are critical cellular processes of not only maintaining normal cellular functions, but also protecting cellular senescence in skin exposed to UV irradiation. In the present studies, we investigated whether modulation of autophagy induction using a novel synthetic SIRT1 activator, heptasodium hexacarboxymethyl dipeptide-12 (named as Aquatide), suppresses the UVB irradiation-induced skin aging. Treatment with Aquatide directly activates SIRT1 and stimulates autophagy induction in cultured human dermal fibroblasts. Next, we found that Aquatide-mediated activation of SIRT1 increases autophagy induction via deacetylation of forkhead box class O (FOXO) 1. Finally, UVB irradiation-induced cellular senescence measured by SA-β-gal staining was significantly decreased in cells treated with Aquatide in parallel to occurring SIRT1 activation-dependent autophagy. Together, Aquatide modulates autophagy through SIRT1 activation, contributing to suppression of skin aging caused by UV irradiation.
Autophagy
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Cell Aging*
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Fibroblasts
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Humans
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Skin
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Skin Aging
3.Comparison of TIMI Myocardial Perfusion Grade with Coronary Flow Reserve for Prediction of Recovery of LV Function and LV Remodeling in Acute Myocardial Infarction.
So Yeon CHOI ; Seung Jea TAHK ; Myeong Ho YOON ; Seung Soo SHIN ; Hyung Mo YANG ; Hong Seok LIM ; Il Hyun CHO ; Tae Young CHOI ; Hyuk Jae CHANG ; Gyo Seung HWANG ; Joon Han SHIN ; Byung Il W CHOI
Korean Circulation Journal 2004;34(3):247-257
BACKGROUND AND OBJECTIVES: The TIMI myocardial perfusion (TMP) grade is known as one of the methods to assess the viability of the myocardium in ischemic heart disease. This study was designed to assess the value of TMP grade itself and to evaluate the correlation with coronary flow reserve (CFR) in the prediction of left ventricular remodeling and functional change after percutaneous coronary intervention (PCI) in acute myocardial infarction (AMI). SUBJECTS AND METHODS: We measured CFR and TMP grade after successful elective PCI (diameter stenosis <0%, and TIMI flow 3) in 83 patients (mean age 55+/-1 years, 18 females) with AMI within 7 days of symptom onset. Left ventricular end diastolic volume index (LVEDVI), left ventricular end systolic volume index (LVESVI), ejection fraction (LVEF), and left ventricular regional wall motion score index (LVRWMSI) were assessed by echocardiography just before and at 9 months after angioplasty (mean 9+/-5 months). RESULTS: Although they had achieved (TIMI 0.021) TIMI 3 flow after successful intervention, 27 of 83 patients (32.5%) had impaired myocardial perfusion. After PCI, angiographic TMP grade was well correlated with CFR measured using Doppler wire (TMP 0/1;1.4+/-0.3, TMP 2;1.9+/-0.6, TMP 3;2.2+/-0.4, rs=0.618, p=0.000). Post-PCI TMP grade was significantly related to the change of LVEDVI (r=0.452, p=0.000), LVESVI (r=0.435, p=0.000), LVEF (r=0.281, p=0.010) and LVRWMSI (r=0.328, p=0.036). CONCLUSION: The TMP grade, a simple angiographic method, might be useful as a predictor of LV volume and functional change in AMI. In the cardiac catheterization laboratory, it could simply replace CFR for the assessment of myocardial viability in patients who receive an elective PCI within 7 days of AMI onset.
Angioplasty
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Cardiac Catheterization
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Cardiac Catheters
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Constriction, Pathologic
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Coronary Circulation
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Echocardiography
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Humans
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Myocardial Infarction*
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Myocardial Ischemia
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Myocardium
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Percutaneous Coronary Intervention
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Perfusion*
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Stents
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Stroke Volume
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Thymidine Monophosphate
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Ventricular Remodeling