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Cho, EunAe,Kwon, HyukSang 한국부식방식학회 2002 Corrosion Science and Technology Vol.31 No.4
The electronic properties of passive film formed on Fe-2OCr stainless steel in pH 8.5 buffer solution were examined by the photocurrent measurements and Mott-Schottky analysis of the film. The passive film on Fe-20Cr exhibited an amorphous or highly disordered n-type semiconductor. The photocurrent spectrum for the passive films formed on Fe-20Cr was almost same in shape to that for the passive film of Fe except for the large difference in photocurrent intensity, which demonstrated that the passive film on Fe-2OCr is composed of Cr substituted r-Fe₂O₃,. However, the large difference in photocurrent intensity for passive film between Fe and Fe-2OCr was due presumably to the fact that Cr^3+ ions in passive film act as effective recombination sites of electron-hole pairs. The relatively high intensity of photocurrent and two linear regions on Mott-Schottky plot for the passive film formed at potentials in Cr-transpassive region was associated with Cr^6+ ions present in the film.
Cho, Eunae,Hu, Yiluo,Choi, Youngjin,Jung, Seunho Elsevier 2018 Journal of industrial and engineering chemistry Vol.63 No.-
<P><B>Abstract</B></P> <P>We have reported a hybrid polymer composite, consisting of a supramolecular assembly of polydiacetylene (PDA) and phospholipid, that undergoes chromatic and fluorogenic changes after specific interactions with progesterone, the pregnancy hormone. Progesterone was selectively detected among 10 steroids by the mixed polymer of 1,2-dimyristoyl-sn-glycero-3-phosphocholine and PDA at an optimized ratio of 1:9. The triggering effect of progesterone on the membrane mimetic system were investigated using UV–vis, fluorescence, circular dichroism spectroscopy, Raman scattering, dynamic light scattering, transmission electron microscopy, and computational method. These results offer insight into self-assembly disruption and membrane targeting antibiotics as well as PDA-based sensing technology.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A DMPC/PDA biomimetic assembly is reported as a colorimetric and fluorescent sensory platform for progesterone. </LI> <LI> Progesterone was detected exclusively among 10 different steroid compounds using the biomimetic membrane interface. </LI> <LI> The triggering effect of progesterone on DMPC/PDA membrane mimetic system was evaluated using various analytical tools. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
The Pentose Phosphate Pathway as a Potential Target for Cancer Therapy
( Eunae Sandra Cho ),( Yong Hoon Cha ),( Hyun Sil Kim ),( Nam Hee Kim ),( Jong In Yook ) 한국응용약물학회 2018 Biomolecules & Therapeutics(구 응용약물학회지) Vol.26 No.1
During cancer progression, cancer cells are repeatedly exposed to metabolic stress conditions in a resource-limited environment which they must escape. Increasing evidence indicates the importance of nicotinamide adenine dinucleotide phosphate (NADPH) homeostasis in the survival of cancer cells under metabolic stress conditions, such as metabolic resource limitation and therapeu-tic intervention. NADPH is essential for scavenging of reactive oxygen species (ROS) mainly derived from oxidative phosphoryla-tion required for ATP generation. Thus, metabolic reprogramming of NADPH homeostasis is an important step in cancer progres-sion as well as in combinational therapeutic approaches. In mammalian, the pentose phosphate pathway (PPP) and one-carbon metabolism are major sources of NADPH production. In this review, we focus on the importance of glucose flux control towards PPP regulated by oncogenic pathways and the potential therein for metabolic targeting as a cancer therapy. We also summarize the role of Snail (Snai1), an important regulator of the epithelial mesenchymal transition (EMT), in controlling glucose flux towards PPP and thus potentiating cancer cell survival under oxidative and metabolic stress.
The Pentose Phosphate Pathway as a Potential Target for Cancer Therapy
Cho, Eunae Sandra,Cha, Yong Hoon,Kim, Hyun Sil,Kim, Nam Hee,Yook, Jong In The Korean Society of Applied Pharmacology 2018 Biomolecules & Therapeutics(구 응용약물학회지) Vol.26 No.1
During cancer progression, cancer cells are repeatedly exposed to metabolic stress conditions in a resource-limited environment which they must escape. Increasing evidence indicates the importance of nicotinamide adenine dinucleotide phosphate (NADPH) homeostasis in the survival of cancer cells under metabolic stress conditions, such as metabolic resource limitation and therapeutic intervention. NADPH is essential for scavenging of reactive oxygen species (ROS) mainly derived from oxidative phosphorylation required for ATP generation. Thus, metabolic reprogramming of NADPH homeostasis is an important step in cancer progression as well as in combinational therapeutic approaches. In mammalian, the pentose phosphate pathway (PPP) and one-carbon metabolism are major sources of NADPH production. In this review, we focus on the importance of glucose flux control towards PPP regulated by oncogenic pathways and the potential therein for metabolic targeting as a cancer therapy. We also summarize the role of Snail (Snai1), an important regulator of the epithelial mesenchymal transition (EMT), in controlling glucose flux towards PPP and thus potentiating cancer cell survival under oxidative and metabolic stress.
Therapeutic implications of cancer epithelial-mesenchymal transition (EMT)
Eunae Sandra Cho,Hee Eun Kang,Nam Hee Kim,Jong In Yook 대한약학회 2019 Archives of Pharmacal Research Vol.42 No.1
The epithelial-mesenchymal transition (EMT)comprises an essential biological process involving cancer progression as well as initiation. While the EMT has been regarded as a phenotypic conversion from epithelial to mesenchymal cells, recent evidence indicates that it plays a critical role in stemness, metabolic reprogramming, immune evasion and therapeutic resistance of cancer cells. Interestingly, several transcriptional repressors including Snail (SNAI1), Slug (SNAI2) and the ZEB family constitute key players for EMT in cancer as well as in the developmental process. Note that the dynamic conversion between EMT and epithelial reversion (mesenchymal-epithelial transition, MET) occurs through variable intermediate-hybrid states rather than being a binary process. Given the close connection between oncogenic signaling and EMT repressors, the EMT has emerged as a therapeutic target or goal (in terms of MET reversion) in cancer therapy. Here we review the critical role of EMT in therapeutic resistance and the importance of EMT as a therapeutic target for human cancer.
Properties and current applications of bacterial cyclic β-glucans and their derivatives
Cho, Eunae,Jeong, Daham,Choi, Youngjin,Jung, Seunho KLUWER ACADEMIC PUBLISHERS 2016 JOURNAL OF INCLUSION PHENOMENA AND MACROCYCLIC CHE Vol. No.
<P>Cyclic beta-glucans are unique constituents that are found in the periplasmic space and extracellular media of Agrobacterium, Rhizobium, Bradyrhizobium, Rhodobacter, Xanthomonas, and Ralstonia species. Based on their glycosidic linkages, they are classified into three groups composed of cyclic beta-(1,2), beta-(1,3)-beta-(1,6), and beta-(1,2)-alpha-(1,6) linked glucans. Their degrees of polymerization vary ranging from 10 to 40 glucose residues, and the backbone structure can be modified with non-sugar moieties. Since the macrocyclic oligosaccharides possess their own characteristics such as inherent three-dimensional structures, hydrogen bonding, and complex-forming abilities, various possible applications would be of interest in the field of green chemistry, separation science, pharmaceutical, and food industries. In this review, we have addressed the properties and current applications of bio-sourced cyclic beta-glucans and their derivatives.</P>