1
|
Kim RM, Han JH, Lee SM, Kim H, Lim YC, Lee HE, Ahn HY, Lee YH, Ha IH, Nam KT. Chiral plasmonic sensing: From the perspective of light-matter interaction. J Chem Phys 2024; 160:061001. [PMID: 38341778 DOI: 10.1063/5.0178485] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2023] [Accepted: 01/07/2024] [Indexed: 02/13/2024] Open
Abstract
Molecular chirality is represented as broken mirror symmetry in the structural orientation of constituent atoms and plays a pivotal role at every scale of nature. Since the discovery of the chiroptic property of chiral molecules, the characterization of molecular chirality is important in the fields of biology, physics, and chemistry. Over the centuries, the field of optical chiral sensing was based on chiral light-matter interactions between chiral molecules and polarized light. Starting from simple optics-based sensing, the utilization of plasmonic materials that could control local chiral light-matter interactions by squeezing light into molecules successfully facilitated chiral sensing into noninvasive, ultrasensitive, and accurate detection. In this Review, the importance of plasmonic materials and their engineering in chiral sensing are discussed based on the principle of chiral light-matter interactions and the theory of optical chirality and chiral perturbation; thus, this Review can serve as a milestone for the proper design and utilization of plasmonic nanostructures for improved chiral sensing.
Collapse
Affiliation(s)
- Ryeong Myeong Kim
- Department of Materials Science and Engineering, Seoul National University, Seoul 08826, Republic of Korea
| | - Jeong Hyun Han
- Department of Materials Science and Engineering, Seoul National University, Seoul 08826, Republic of Korea
| | - Soo Min Lee
- Department of Materials Science and Engineering, Seoul National University, Seoul 08826, Republic of Korea
| | - Hyeohn Kim
- Department of Materials Science and Engineering, Seoul National University, Seoul 08826, Republic of Korea
| | - Yae-Chan Lim
- Department of Materials Science and Engineering, Seoul National University, Seoul 08826, Republic of Korea
| | - Hye-Eun Lee
- Department of Materials Science and Engineering, Seoul National University, Seoul 08826, Republic of Korea
| | - Hyo-Yong Ahn
- Department of Materials Science and Engineering, Seoul National University, Seoul 08826, Republic of Korea
| | - Yoon Ho Lee
- Department of Materials Science and Engineering, Seoul National University, Seoul 08826, Republic of Korea
| | - In Han Ha
- Department of Materials Science and Engineering, Seoul National University, Seoul 08826, Republic of Korea
| | - Ki Tae Nam
- Department of Materials Science and Engineering, Seoul National University, Seoul 08826, Republic of Korea
| |
Collapse
|
2
|
Yamanishi J, Ahn HY, Okamoto H. Nanoscopic Observation of Chiro-Optical Force. Nano Lett 2023; 23:9347-9352. [PMID: 37792311 PMCID: PMC10607231 DOI: 10.1021/acs.nanolett.3c02534] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/10/2023] [Revised: 09/24/2023] [Indexed: 10/05/2023]
Abstract
Nanoscopic observation of chiro-optical phenomena is essential in wide scientific areas but has measurement difficulties; hence, its physics is still unknown. To obtain a full understanding of the physics of chiro-optical systems and derive the full potentials, it is essential to perform an in situ observation of the chiro-optical effect from the individual parts because the macroscopic chiro-optical effect cannot be translated directly into microscopic effects. In the present study, we observed the chiro-optical responses at the nanoscale level by detecting the chiro-optical forces, which were generated by illumination of the material-probe system with circularly polarized light. The induced optical force was dependent on the handedness and wavelength of the incident circularly polarized light and was well correlated to the electromagnetically simulated differential intensity of the longitudinal electric field. Our results facilitate the clarification of chiro-optical phenomena at the nanoscale level and could innovate chiro-optical nanotechnologies.
Collapse
Affiliation(s)
- Junsuke Yamanishi
- Institute
for Molecular Science, National Institutes
of Natural Sciences, 38 Nishigonaka, Myodaiji, Okazaki, Aichi 444-8585, Japan
| | - Hyo-Yong Ahn
- Institute
for Molecular Science, National Institutes
of Natural Sciences, 38 Nishigonaka, Myodaiji, Okazaki, Aichi 444-8585, Japan
- Center
for Novel Science Initiatives, National
Institutes of Natural Sciences, 4-3-13 Toranomon, Minato-ku, Tokyo 105-0001, Japan
| | - Hiromi Okamoto
- Institute
for Molecular Science, National Institutes
of Natural Sciences, 38 Nishigonaka, Myodaiji, Okazaki, Aichi 444-8585, Japan
- The
Graduate University for Advanced Studies (Sokendai), 38 Nishigonaka, Myodaiji, Okazaki, Aichi 444-8585, Japan
| |
Collapse
|
3
|
Abstract
When a chiral nanoparticle is optically trapped using a circularly polarized laser beam, a circular polarization (CP)–dependent gradient force can be induced on the particle. We investigated the CP-dependent gradient force exerted on three-dimensional chiral nanoparticles. The experimental results showed that the gradient force depended on the handedness of the CP of the trapping light and the particle chirality. The analysis revealed that the spectral features of the CP handedness–dependent gradient force are influenced not only by the real part of the refractive index but also by the electromagnetic field perturbed by the chiral particle resonant with the incident light. This is in sharp contrast to the well-known behavior of the gradient force, which is governed by the real part of the refractive index. The extended aspect of the chiral optical force obtained here can provide novel methodologies on chirality sensing, manipulation, separation, enantioselective biological reactions, and other fields.
Collapse
Affiliation(s)
- Junsuke Yamanishi
- Institute for Molecular Science, National Institutes of Natural Sciences, 38 Nishigonaka, Myodaiji, Okazaki, Aichi 444-8585, Japan
| | - Hyo-Yong Ahn
- Institute for Molecular Science, National Institutes of Natural Sciences, 38 Nishigonaka, Myodaiji, Okazaki, Aichi 444-8585, Japan
- Center for Novel Science Initiatives, National Institutes of Natural Sciences, 4-3-13 Toranomon, Minato-ku, Tokyo 105-0001, Japan
| | - Hidemasa Yamane
- Department of Physics and Electronics, Osaka Prefecture University, 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka 599-8531, Japan
- Department of Physics, Kitasato University, 1-15-1 Kitasato, Minami-ku, Sagamihara, Kanagawa 252-0373, Japan
| | - Shun Hashiyada
- Institute for Molecular Science, National Institutes of Natural Sciences, 38 Nishigonaka, Myodaiji, Okazaki, Aichi 444-8585, Japan
- Innovative Photon Manipulation Research Team, RIKEN Center for Advanced Photonics, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- Department of Electrical, Electronic, and Communication Engineering, Faculty of Science and Engineering, Chuo University, 1-13-27 Kasuga, Bunkyo-ku, Tokyo 112-8551, Japan
| | - Hajime Ishihara
- Department of Physics and Electronics, Osaka Prefecture University, 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka 599-8531, Japan
- Department of Materials Engineering Science, Osaka University, 1-3 Machikaneyama-cho, Toyonaka, Osaka 560-8531, Japan
- Center for Quantum Information and Quantum Biology, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Ki Tae Nam
- Department of Materials Science and Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea
| | - Hiromi Okamoto
- Institute for Molecular Science, National Institutes of Natural Sciences, 38 Nishigonaka, Myodaiji, Okazaki, Aichi 444-8585, Japan
| |
Collapse
|
4
|
Im SW, Ahn HY, Kim RM, Cho NH, Kim H, Lim YC, Lee HE, Nam KT. Chiral Surface and Geometry of Metal Nanocrystals. Adv Mater 2020; 32:e1905758. [PMID: 31834668 DOI: 10.1039/d0ma00125b] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/04/2019] [Revised: 11/11/2019] [Indexed: 05/24/2023]
Abstract
Chirality is a basic property of nature and has great importance in photonics, biochemistry, medicine, and catalysis. This importance has led to the emergence of the chiral inorganic nanostructure field in the last two decades, providing opportunities to control the chirality of light and biochemical reactions. While the facile production of 3D nanostructures has remained a major challenge, recent advances in nanocrystal synthesis have provided a new pathway for efficient control of chirality at the nanoscale by transferring molecular chirality to the geometry of nanocrystals. Interestingly, this discovery stems from a purely crystallographic outcome: chirality can be generated on high-Miller-index surfaces, even for highly symmetric metal crystals. This is the starting point herein, with an overview of the scientific history and a summary of the crystallographic definition. With the advance of nanomaterial synthesis technology, high-Miller-index planes can be selectively exposed on metallic nanoparticles. The enantioselective interaction of chiral molecules and high-Miller-index facets can break the mirror symmetry of the metal nanocrystals. Herein, the fundamental principle of chirality evolution is emphasized and it is shown how chiral surfaces can be directly correlated with chiral morphologies, thus serving as a guide for researchers in chiral catalysts, chiral plasmonics, chiral metamaterials, and photonic devices.
Collapse
Affiliation(s)
- Sang Won Im
- Department of Materials Science and Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, South Korea
| | - Hyo-Yong Ahn
- Department of Materials Science and Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, South Korea
| | - Ryeong Myeong Kim
- Department of Materials Science and Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, South Korea
| | - Nam Heon Cho
- Department of Materials Science and Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, South Korea
| | - Hyeohn Kim
- Department of Materials Science and Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, South Korea
| | - Yae-Chan Lim
- Department of Materials Science and Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, South Korea
| | - Hye-Eun Lee
- Department of Materials Science and Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, South Korea
| | - Ki Tae Nam
- Department of Materials Science and Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, South Korea
| |
Collapse
|
5
|
Im SW, Ahn HY, Kim RM, Cho NH, Kim H, Lim YC, Lee HE, Nam KT. Chiral Surface and Geometry of Metal Nanocrystals. Adv Mater 2020; 32:e1905758. [PMID: 31834668 DOI: 10.1002/adma.201905758] [Citation(s) in RCA: 58] [Impact Index Per Article: 14.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/04/2019] [Revised: 11/11/2019] [Indexed: 05/15/2023]
Abstract
Chirality is a basic property of nature and has great importance in photonics, biochemistry, medicine, and catalysis. This importance has led to the emergence of the chiral inorganic nanostructure field in the last two decades, providing opportunities to control the chirality of light and biochemical reactions. While the facile production of 3D nanostructures has remained a major challenge, recent advances in nanocrystal synthesis have provided a new pathway for efficient control of chirality at the nanoscale by transferring molecular chirality to the geometry of nanocrystals. Interestingly, this discovery stems from a purely crystallographic outcome: chirality can be generated on high-Miller-index surfaces, even for highly symmetric metal crystals. This is the starting point herein, with an overview of the scientific history and a summary of the crystallographic definition. With the advance of nanomaterial synthesis technology, high-Miller-index planes can be selectively exposed on metallic nanoparticles. The enantioselective interaction of chiral molecules and high-Miller-index facets can break the mirror symmetry of the metal nanocrystals. Herein, the fundamental principle of chirality evolution is emphasized and it is shown how chiral surfaces can be directly correlated with chiral morphologies, thus serving as a guide for researchers in chiral catalysts, chiral plasmonics, chiral metamaterials, and photonic devices.
Collapse
Affiliation(s)
- Sang Won Im
- Department of Materials Science and Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, South Korea
| | - Hyo-Yong Ahn
- Department of Materials Science and Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, South Korea
| | - Ryeong Myeong Kim
- Department of Materials Science and Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, South Korea
| | - Nam Heon Cho
- Department of Materials Science and Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, South Korea
| | - Hyeohn Kim
- Department of Materials Science and Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, South Korea
| | - Yae-Chan Lim
- Department of Materials Science and Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, South Korea
| | - Hye-Eun Lee
- Department of Materials Science and Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, South Korea
| | - Ki Tae Nam
- Department of Materials Science and Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, South Korea
| |
Collapse
|
6
|
Kim H, Im SW, Cho NH, Seo DH, Kim RM, Lim YC, Lee HE, Ahn HY, Nam KT. γ-Glutamylcysteine- and Cysteinylglycine-Directed Growth of Chiral Gold Nanoparticles and their Crystallographic Analysis. Angew Chem Int Ed Engl 2020; 59:12976-12983. [PMID: 32337812 DOI: 10.1002/anie.202003760] [Citation(s) in RCA: 32] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2020] [Revised: 04/13/2020] [Indexed: 12/12/2022]
Abstract
Chiral optical metamaterials with delicate structures are in high demand in various fields because of their strong light-matter interactions. Recently, a scalable strategy for the synthesis of chiral plasmonic nanoparticles (NPs) using amino acids and peptides has been reported. Reported herein, 3D chiral gold NPs were synthesized using dipeptide γ-Glu-Cys and Cys-Gly and analyzed crystallographically. The γ-Glu-Cys-directed NPs present a cube-like outline with a protruding chiral wing. In comparison, the NPs synthesized with Cys-Gly exhibited a rhombic dodecahedron-like outline with curved edges and elliptical cavities on each face. Morphology analysis of intermediates indicated that γ-Glu-Cys generated an intermediate concave hexoctahedron morphology, while Cys-Gly formed a concave rhombic dodecahedron. NPs synthesized with Cys-Gly are named 432 helicoid V because of their unique morphology and growth pathway.
Collapse
Affiliation(s)
- Hyeohn Kim
- Department of Materials Science and Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, Republic of Korea
| | - Sang Won Im
- Department of Materials Science and Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, Republic of Korea
| | - Nam Heon Cho
- Department of Materials Science and Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, Republic of Korea
| | - Da Hye Seo
- Department of Materials Science and Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, Republic of Korea
| | - Ryeong Myeong Kim
- Department of Materials Science and Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, Republic of Korea
| | - Yae-Chan Lim
- Department of Materials Science and Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, Republic of Korea
| | - Hye-Eun Lee
- Department of Materials Science and Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, Republic of Korea
| | - Hyo-Yong Ahn
- Department of Materials Science and Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, Republic of Korea
| | - Ki Tae Nam
- Department of Materials Science and Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, Republic of Korea
| |
Collapse
|
7
|
Cho NH, Byun GH, Lim YC, Im SW, Kim H, Lee HE, Ahn HY, Nam KT. Uniform Chiral Gap Synthesis for High Dissymmetry Factor in Single Plasmonic Gold Nanoparticle. ACS Nano 2020; 14:3595-3602. [PMID: 32134639 DOI: 10.1021/acsnano.9b10094] [Citation(s) in RCA: 47] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Synthesis of chiral plasmonic materials has been highlighted for the last decades with their optical properties and versatile potential applications. Recently reported aqueous-based amino acid- and peptide-directed synthesis of chiral plasmonic gold nanoparticles with 432 point-group symmetry shows exceptionally high chiroptic response within 100 nm scales. Despite its already excellent chiroptic response, a single-nanoparticle dark field scattering study revealed that full chiroptic potential of chiral gold nanoparticle is limited with its overall synthetic uniformity. Based on this knowledge, we present a multi-chirality-evolution step synthesis method for the enhancement of chiroptic response through an increase in particle uniformity. Detailed time variant study and interrelationship study of reaction parameters allowed the systematic construction of design principles for chiral nanoparticles with exceptional chiroptic response. With the application of precisely controlled growth kinetic to two distinct growth regimes, modified chiral gold nanoparticles showed significantly improved uniformity, achieving an improved dissymmetry factor of g = 0.31. We expect that our strategy will aid in precise morphology and property control for chiral nanomaterials, which can be used in various plasmonic metamaterial applications.
Collapse
Affiliation(s)
- Nam Heon Cho
- Materials Science and Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea
| | - Gi Hyun Byun
- Materials Science and Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea
| | - Yae-Chan Lim
- Materials Science and Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea
| | - Sang Won Im
- Materials Science and Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea
| | - Hyeohn Kim
- Materials Science and Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea
| | - Hye-Eun Lee
- Materials Science and Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea
| | - Hyo-Yong Ahn
- Materials Science and Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea
| | - Ki Tae Nam
- Materials Science and Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea
| |
Collapse
|
8
|
Lee HE, Kim RM, Ahn HY, Lee YY, Byun GH, Im SW, Mun J, Rho J, Nam KT. Cysteine-encoded chirality evolution in plasmonic rhombic dodecahedral gold nanoparticles. Nat Commun 2020; 11:263. [PMID: 31937767 PMCID: PMC6959252 DOI: 10.1038/s41467-019-14117-x] [Citation(s) in RCA: 80] [Impact Index Per Article: 20.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2018] [Accepted: 12/09/2019] [Indexed: 11/09/2022] Open
Abstract
Chiral plasmonic nanostructures have opened up unprecedented opportunities in optical applications. We present chirality evolution in nanoparticles focusing on the crystallographic aspects and elucidate key parameters for chiral structure formation. From a detailed understanding of chirality formation, we achieved a morphology (432 Helicoid IV) of three-dimensionally controlled chiral plasmonic nanoparticles based on the rhombic dodecahedral shape. The role of the synthesis parameters, seed, cysteine, cetyltrimethylammonium bromide and ascorbic acid on chiral formation are studied, and based on this understanding, the systematic control of the chiral structure is presented. The relation between the modulated chiral structure factors and optical response is further elucidated by electromagnetic simulation. Importantly, a new optical response is achieved by assembling chiral nanoparticles into a film. This comprehensive study of chiral nanoparticles will provide valuable insight for the further development of diverse chiral plasmonic nanostructures with fascinating properties. Chirality of amino acids can be transferred to the high index plane of gold nanoparticles, resulting in chiral plasmonic nanoparticles called the 432 Helicoid series. Here, the authors present a 432 Helicoid IV and describe a systematic approach to modulate the chirality of single particles by controlling the kinetics.
Collapse
Affiliation(s)
- Hye-Eun Lee
- Department of Materials Science and Engineering, Seoul National University, Seoul, 08826, Korea
| | - Ryeong Myeong Kim
- Department of Materials Science and Engineering, Seoul National University, Seoul, 08826, Korea
| | - Hyo-Yong Ahn
- Department of Materials Science and Engineering, Seoul National University, Seoul, 08826, Korea
| | - Yoon Young Lee
- Department of Materials Science and Engineering, Seoul National University, Seoul, 08826, Korea
| | - Gi Hyun Byun
- Department of Materials Science and Engineering, Seoul National University, Seoul, 08826, Korea
| | - Sang Won Im
- Department of Materials Science and Engineering, Seoul National University, Seoul, 08826, Korea
| | - Jungho Mun
- Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), Pohang, 37673, Korea
| | - Junsuk Rho
- Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), Pohang, 37673, Korea.,Department of Mechanical Engineering, Pohang University of Science and Technology (POSTECH), Pohang, 37673, Korea
| | - Ki Tae Nam
- Department of Materials Science and Engineering, Seoul National University, Seoul, 08826, Korea.
| |
Collapse
|
9
|
Seong JY, Ahn HY, Park Y, Shin S, Ha IH. Association Between Aerobic Exercise and Handgrip Strength in Adults: A Cross-Sectional Study Based on Data from the Korean National Health and Nutrition Examination Survey (2014-2017). J Nutr Health Aging 2020; 24:619-626. [PMID: 32510115 DOI: 10.1007/s12603-020-1372-x] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
OBJECTIVES Handgrip strength is an easy-to-assess indicator of overall muscle strength and can be used to evaluate health status. Although previous studies have reported an increase in grip strength due to aerobic exercise, such a study has not been conducted on Korean participants. This study aimed to investigate the effects of aerobic exercise on handgrip strength and examine the association between these two variables in Korean patients with hypertension or diabetes. DESIGN Cross-sectional study. SETTING This study used data from the 6th and 7th Korean National Health and Nutrition Examination Survey (2014-2017). PARTICIPANTS A total of 19,650 individuals aged ≥19 years who had responded to questionnaires concerning aerobic exercise and handgrip strength were analyzed. MEASUREMENTS The relationship between aerobic activity and handgrip strength was examined by logistic regression analysis. RESULTS The mean age of individuals in the low muscle strength group was higher than that in the normal muscle strength group. The odds ratio for low handgrip strength was higher in individuals who did not perform aerobic exercise than in those who performed aerobic exercise. Following adjustment for covariates, the odds ratios (95% confidence intervals) for low handgrip strength were 1.415 (0.187-1.688) in the total sample, 1.799 (1.376-2.352) in patients with hypertension, and 1.811 (1.208-2.715) in patients with diabetes. CONCLUSION The results of our study indicated a strong association between aerobic exercise and handgrip strength in the Korean population.
Collapse
Affiliation(s)
- J Y Seong
- In-Hyuk Ha, Jaseng Spine and Joint Research Institute, Jaseng Medical Foundation, 537 Gangnam-daero, Gangnam-gu, Seoul 06110, Republic of Korea, Tel: +82-2-2222-2740; Fax: +82-2-3218-2244, E-mail:
| | | | | | | | | |
Collapse
|
10
|
Ahn HY, Yoo S, Cho NH, Kim RM, Kim H, Huh JH, Lee S, Nam KT. Bioinspired Toolkit Based on Intermolecular Encoder toward Evolutionary 4D Chiral Plasmonic Materials. Acc Chem Res 2019; 52:2768-2783. [PMID: 31536328 DOI: 10.1021/acs.accounts.9b00264] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Over the last two decades, nanophotonics, including plasmonics and metamaterials, have promised compelling opportunities for exotic control over light-matter interactions. The strong chiral light-matter interaction is a representative example. Three-dimensional (3D) chirality has existed naturally only in organic molecules and bio-organisms, but a negligible chiroptic effect was attained with these naturally occurring materials because of their small absorption cross sections. However, inspired by biological chirality, nanophotonic chiral materials have greatly expanded the design space of accessible chiroptic effects (e.g., pushing the chiral light-matter interaction to an exceptional regime, such as a broad-band circular polarizer, negative refractive index, and sensitive chiral sensing). Nevertheless, it is still a challenge to achieve precisely defined and dynamically reconfigurable chiral morphologies that further increase the chiroptic effect. Biological systems continue to inspire approaches to the design and synthesis of precisely defined 3D nanostructures. In particular, a living organism can program the evolutionary pathway of highly complexed 3D chiral morphology precisely from the molecular scale to the macroscopic scale while simultaneously enabling dynamic reconfiguration of their chirality. What if we could harness the power of biological selectivity and evolutionary capability in synthesizing chiral plasmonic materials? We envisioned that platform technology mimicking biological principles would enable control of 3D chiral structures for effective plasmonic interactions with polarized light and further impart the concept of time-dependent evolution (3D + 1D = 4D) to bring about responsive and dynamic changes in chiral plasmonics. In this Account, we review our efforts to develop the biomolecule-based synthesis of 3D chiral plasmonic materials and share the vision that as in biological systems, chirality can be programmed at the molecular level and hierarchically transferred at multiple scales to develop macroscopic chirality. Accompanied by a biomimetic time-dependent chirality of singular plasmonic nanometals, we also summarize recent achievements in the chemistry and nanophotonics communities pursuing 4D plasmonics that are closely related to our research. The biomimetic and bioinspired approaches discussed in this Account will provide new synthetic insights into implementing chiral nanomaterials and extend the range of accessible nanophotonic design. We hope that the molecular encoding approach will be useful to achieve dynamic light-matter interactions at unprecedented dimensions, time scales, and chirality.
Collapse
Affiliation(s)
- Hyo-Yong Ahn
- Department of Materials Science and Engineering, Seoul National University, Seoul 08826, Korea
| | - SeokJae Yoo
- Department of Physics, Korea University, Seoul 02841, Korea
- Department of Physics, University of California, Berkeley, California 94720, United States
| | - Nam Heon Cho
- Department of Materials Science and Engineering, Seoul National University, Seoul 08826, Korea
| | - Ryeong Myeong Kim
- Department of Materials Science and Engineering, Seoul National University, Seoul 08826, Korea
| | - Hyeohn Kim
- Department of Materials Science and Engineering, Seoul National University, Seoul 08826, Korea
| | - Ji-Hyeok Huh
- KU-KIST Graduate School of Converging Science and Technology and Department of Biomicrosystem Technology, Korea University, Seoul 02841, Korea
| | - Seungwoo Lee
- KU-KIST Graduate School of Converging Science and Technology and Department of Biomicrosystem Technology, Korea University, Seoul 02841, Korea
| | - Ki Tae Nam
- Department of Materials Science and Engineering, Seoul National University, Seoul 08826, Korea
| |
Collapse
|
11
|
Ha H, Jin K, Park S, Lee KG, Cho KH, Seo H, Ahn HY, Lee YH, Nam KT. Highly Selective Active Chlorine Generation Electrocatalyzed by Co 3O 4 Nanoparticles: Mechanistic Investigation through in Situ Electrokinetic and Spectroscopic Analyses. J Phys Chem Lett 2019; 10:1226-1233. [PMID: 30816050 DOI: 10.1021/acs.jpclett.9b00547] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
The reaction mechanism of electrochemical chloride oxidation at neutral pH is different from that at acidic pH, in which a commercial chlor-alkali process has been developed. Different proton concentrations and accelerated hydrolysis of the generated chlorine into hypochlorous acid at high pH can change the electrokinetics and stability of reaction intermediates. We have investigated a unique reaction mechanism of Co3O4 nanoparticles for chloride oxidation at neutral pH. In contrast with water oxidation, the valency of cobalt was not changed during chloride oxidation. Interestingly, a new intermediate of Co-Cl was captured spectroscopically, distinct from the reaction intermediate at acidic pH. In addition, Co3O4 nanoparticles exhibited high selectivity for active chlorine generation at neutral pH, comparable to commercially available RuO2-based catalysts. We believe that this study provides insight into designing efficient electrocatalysts for active chlorine generation at neutral pH, which can be practically applied to electrochemical water treatment coupled to hydrogen production.
Collapse
Affiliation(s)
- Heonjin Ha
- Department of Materials Science and Engineering , Seoul National University , Seoul 08826 , Korea
| | - Kyoungsuk Jin
- Department of Materials Science and Engineering , Seoul National University , Seoul 08826 , Korea
| | - Sunghak Park
- Department of Materials Science and Engineering , Seoul National University , Seoul 08826 , Korea
| | - Kang-Gyu Lee
- Department of Materials Science and Engineering , Seoul National University , Seoul 08826 , Korea
| | - Kang Hee Cho
- Department of Materials Science and Engineering , Seoul National University , Seoul 08826 , Korea
| | - Hongmin Seo
- Department of Materials Science and Engineering , Seoul National University , Seoul 08826 , Korea
| | - Hyo-Yong Ahn
- Department of Materials Science and Engineering , Seoul National University , Seoul 08826 , Korea
| | - Yoon Ho Lee
- Department of Materials Science and Engineering , Seoul National University , Seoul 08826 , Korea
| | - Ki Tae Nam
- Department of Materials Science and Engineering , Seoul National University , Seoul 08826 , Korea
| |
Collapse
|
12
|
Chang H, Lee YY, Lee HE, Ahn HY, Ko E, Nam KT, Jeong DH. Size-controllable and uniform gold bumpy nanocubes for single-particle-level surface-enhanced Raman scattering sensitivity. Phys Chem Chem Phys 2019; 21:9044-9051. [DOI: 10.1039/c9cp00138g] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Gold nanocubes modified to form roughened structures with very strong and uniform single-particle surface-enhanced Raman scattering intensity were developed.
Collapse
Affiliation(s)
- Hyejin Chang
- Division of Science Education
- Kangwon National University
- Chuncheon 24341
- Republic of Korea
| | - Yoon Young Lee
- Department of Materials Science and Engineering
- Seoul National University
- Seoul 08826
- Republic of Korea
| | - Hye Eun Lee
- Department of Materials Science and Engineering
- Seoul National University
- Seoul 08826
- Republic of Korea
| | - Hyo-Yong Ahn
- Department of Materials Science and Engineering
- Seoul National University
- Seoul 08826
- Republic of Korea
| | - Eunbyeol Ko
- Department of Chemistry Education
- Seoul National University
- Seoul 08826
- Republic of Korea
| | - Ki Tae Nam
- Department of Materials Science and Engineering
- Seoul National University
- Seoul 08826
- Republic of Korea
| | - Dae Hong Jeong
- Department of Chemistry Education
- Seoul National University
- Seoul 08826
- Republic of Korea
- Center for Education Research
| |
Collapse
|
13
|
Moon J, Sim U, Kim DJ, Ahn HY, An J, Ha H, Choi KS, Jeon C, Lee J, Nam KT, Hong BH. Hierarchical carbon-silicon nanowire heterostructures for the hydrogen evolution reaction. Nanoscale 2018; 10:13936-13941. [PMID: 30020302 DOI: 10.1039/c8nr02262c] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Abstract
Silicon nanowires (SiNWs) opened up exciting possibilities in a variety of research fields due to their unique anisotropic morphologies, facile tuning capabilities, and accessible fabrication methods. The SiNW-based photoelectrochemical (PEC) conversion has recently been known to provide an efficiency superior to that of various photo-responsive semiconductor heterostructures. However, a challenge still remains in designing optimum structures to minimize photo-oxidation and photo-corrosion of the Si surface in a liquid electrolyte. Here, we report a simple method to synthesize hierarchically branched carbon nanowires (CNWs) on SiNWs utilizing copper vapor as the catalyst in a chemical vapor deposition (CVD) process, which exhibits outstanding photocatalytic activities for hydrogen generation along with excellent chemical stability against oxidation and corrosion. Thus, we believe that the CNW-SiNW photoelectrodes would provide a new route to developing high-performing cost-effective catalysts essential for advanced energy conversion and storage technologies.
Collapse
Affiliation(s)
- Joonhee Moon
- Advanced Institute of Convergence Technology and Department of Chemistry, Graphene Research Center, Seoul National University, Seoul 08826, Republic of Korea. and Advanced Nano-Surface Research Group, Korea Basic Science Institute, Gwahak-ro, Yuseong-gu, Daejeon 34133, Republic of Korea
| | - Uk Sim
- Department of Materials Science & Engineering, Chonnam National University, Gwangju 61186, Republic of Korea
| | - Dong Jin Kim
- Graduate School of Convergence Science and Technology & Graphene Square Inc., Seoul National University, Seoul 08826, Republic of Korea
| | - Hyo-Yong Ahn
- Department of Materials Science & Engineering, Seoul National University, 1 Gwanak-ro, Seoul 151-744, Republic of Korea.
| | - Junghyun An
- Department of Materials Science & Engineering, Seoul National University, 1 Gwanak-ro, Seoul 151-744, Republic of Korea.
| | - Heonjin Ha
- Department of Materials Science & Engineering, Seoul National University, 1 Gwanak-ro, Seoul 151-744, Republic of Korea.
| | - Kyoung Soon Choi
- Advanced Nano-Surface Research Group, Korea Basic Science Institute, Gwahak-ro, Yuseong-gu, Daejeon 34133, Republic of Korea
| | - Cheolho Jeon
- Advanced Nano-Surface Research Group, Korea Basic Science Institute, Gwahak-ro, Yuseong-gu, Daejeon 34133, Republic of Korea
| | - Jouhahn Lee
- Advanced Nano-Surface Research Group, Korea Basic Science Institute, Gwahak-ro, Yuseong-gu, Daejeon 34133, Republic of Korea
| | - Ki Tae Nam
- Department of Materials Science & Engineering, Seoul National University, 1 Gwanak-ro, Seoul 151-744, Republic of Korea.
| | - Byung Hee Hong
- Advanced Institute of Convergence Technology and Department of Chemistry, Graphene Research Center, Seoul National University, Seoul 08826, Republic of Korea. and Graduate School of Convergence Science and Technology & Graphene Square Inc., Seoul National University, Seoul 08826, Republic of Korea
| |
Collapse
|
14
|
Lee HE, Ahn HY, Mun J, Lee YY, Kim M, Cho NH, Chang K, Kim WS, Rho J, Nam KT. Amino-acid- and peptide-directed synthesis of chiral plasmonic gold nanoparticles. Nature 2018; 556:360-365. [PMID: 29670265 DOI: 10.1038/s41586-018-0034-1] [Citation(s) in RCA: 516] [Impact Index Per Article: 86.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2017] [Accepted: 02/26/2018] [Indexed: 11/09/2022]
Abstract
Understanding chirality, or handedness, in molecules is important because of the enantioselectivity that is observed in many biochemical reactions 1 , and because of the recent development of chiral metamaterials with exceptional light-manipulating capabilities, such as polarization control2-4, a negative refractive index 5 and chiral sensing 6 . Chiral nanostructures have been produced using nanofabrication techniques such as lithography 7 and molecular self-assembly8-11, but large-scale and simple fabrication methods for three-dimensional chiral structures remain a challenge. In this regard, chirality transfer represents a simpler and more efficient method for controlling chiral morphology12-18. Although a few studies18,19 have described the transfer of molecular chirality into micrometre-sized helical ceramic crystals, this technique has yet to be implemented for metal nanoparticles with sizes of hundreds of nanometres. Here we develop a strategy for synthesizing chiral gold nanoparticles that involves using amino acids and peptides to control the optical activity, handedness and chiral plasmonic resonance of the nanoparticles. The key requirement for achieving such chiral structures is the formation of high-Miller-index surfaces ({hkl}, h ≠ k ≠ l ≠ 0) that are intrinsically chiral, owing to the presence of 'kink' sites20-22 in the nanoparticles during growth. The presence of chiral components at the inorganic surface of the nanoparticles and in the amino acids and peptides results in enantioselective interactions at the interface between these elements; these interactions lead to asymmetric evolution of the nanoparticles and the formation of helicoid morphologies that consist of highly twisted chiral elements. The gold nanoparticles that we grow display strong chiral plasmonic optical activity (a dis-symmetry factor of 0.2), even when dispersed randomly in solution; this observation is supported by theoretical calculations and direct visualizations of macroscopic colour transformations. We anticipate that our strategy will aid in the rational design and fabrication of three-dimensional chiral nanostructures for use in plasmonic metamaterial applications.
Collapse
Affiliation(s)
- Hye-Eun Lee
- Department of Materials Science and Engineering, Seoul National University, Seoul, South Korea
| | - Hyo-Yong Ahn
- Department of Materials Science and Engineering, Seoul National University, Seoul, South Korea
| | - Jungho Mun
- Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), Pohang, South Korea
| | - Yoon Young Lee
- Department of Materials Science and Engineering, Seoul National University, Seoul, South Korea
| | - Minkyung Kim
- Department of Mechanical Engineering, POSTECH, Pohang, South Korea
| | - Nam Heon Cho
- Department of Materials Science and Engineering, Seoul National University, Seoul, South Korea
| | - Kiseok Chang
- R&D Center, LG Display, LG Science Park, Seoul, South Korea
| | - Wook Sung Kim
- R&D Center, LG Display, LG Science Park, Seoul, South Korea.,Department of Electrical Engineering, POSTECH, Pohang, South Korea
| | - Junsuk Rho
- Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), Pohang, South Korea. .,Department of Mechanical Engineering, POSTECH, Pohang, South Korea.
| | - Ki Tae Nam
- Department of Materials Science and Engineering, Seoul National University, Seoul, South Korea.
| |
Collapse
|
15
|
Lee CW, Hong JS, Yang KD, Jin K, Lee JH, Ahn HY, Seo H, Sung NE, Nam KT. Selective Electrochemical Production of Formate from Carbon Dioxide with Bismuth-Based Catalysts in an Aqueous Electrolyte. ACS Catal 2018. [DOI: 10.1021/acscatal.7b03242] [Citation(s) in RCA: 152] [Impact Index Per Article: 25.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Chan Woo Lee
- Department
of Materials Science and Engineering, Seoul National University, Seoul 151-744, Korea
- Clean
Energy Research Center, Korea Institute of Science and Technology (KIST), 5 Hwarang-ro 14-gil, Seongbuk-gu, Seoul 02792, Republic of Korea
| | - Jung Sug Hong
- Department
of Materials Science and Engineering, Seoul National University, Seoul 151-744, Korea
| | - Ki Dong Yang
- Department
of Materials Science and Engineering, Seoul National University, Seoul 151-744, Korea
| | - Kyoungsuk Jin
- Department
of Materials Science and Engineering, Seoul National University, Seoul 151-744, Korea
| | - Jun Ho Lee
- Department
of Materials Science and Engineering, Seoul National University, Seoul 151-744, Korea
| | - Hyo-Yong Ahn
- Department
of Materials Science and Engineering, Seoul National University, Seoul 151-744, Korea
| | - Hongmin Seo
- Department
of Materials Science and Engineering, Seoul National University, Seoul 151-744, Korea
| | - Nark-Eon Sung
- Pohang
Accelerator Laboratory, Pohang University of Science and Technology, Pohang 37673, Republic of Korea
| | - Ki Tae Nam
- Department
of Materials Science and Engineering, Seoul National University, Seoul 151-744, Korea
| |
Collapse
|
16
|
Kim Y, Kang B, Ahn HY, Seo J, Nam KT. Plasmon Enhanced Fluorescence Based on Porphyrin-Peptoid Hybridized Gold Nanoparticle Platform. Small 2017; 13:1700071. [PMID: 28513982 DOI: 10.1002/smll.201700071] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/06/2017] [Revised: 03/08/2017] [Indexed: 06/07/2023]
Abstract
A porphyrin-peptoid-hybridized silica-coated gold nanoparticle is developed, which is inspired by the protein-chlorophyll ensemble found in photosynthetic antenna. In the natural antenna, chlorophylls are integrated into dense assemblies that are supported by frameworks of proteins, which ensure optimal pigment arrangement for effective light harvesting. In the subject platform, porphyrins are conjugated to the peptoid helix scaffold in a structurally well-defined alignments and subsequently immobilized on the surface of nanoparticles. This prevents intermolecular aggregation among porphyrins and allows high resolution analysis of the effect of porphyrin configuration on the optical properties of the system. Interestingly, under the influence of plasmon from the gold nanoparticle core, the fluorescence of porphyrin is enhanced up to 24-fold at the wavelength where the plasmon resonance matches the porphyrin excitation wavelength. In addition, differences in porphyrin configuration result in spectral modification of their fluorescence emissions. Particularly, the peptoid bearing two porphyrins at a distance of 6 Å shows the most significant alteration in fluorescence. The platform can facilitate extensive studies on the relationship between porphyrin arrangement design and their photophysical interaction in antenna complexes.
Collapse
Affiliation(s)
- Younghye Kim
- Department of Materials Science and Engineering, Seoul National University, Seoul, 151-744, Republic of Korea
| | - Boyeong Kang
- Department of Chemistry, School of Physics and Chemistry, Gwangju Institute of Science and Technology, Gwangju, 500-712, Republic of Korea
| | - Hyo-Yong Ahn
- Department of Materials Science and Engineering, Seoul National University, Seoul, 151-744, Republic of Korea
| | - Jiwon Seo
- Department of Chemistry, School of Physics and Chemistry, Gwangju Institute of Science and Technology, Gwangju, 500-712, Republic of Korea
| | - Ki Tae Nam
- Department of Materials Science and Engineering, Seoul National University, Seoul, 151-744, Republic of Korea
| |
Collapse
|
17
|
Sim U, Moon J, Lee J, An J, Ahn HY, Kim DJ, Jo I, Jeon C, Han S, Hong BH, Nam KT. Double-Layer Graphene Outperforming Monolayer as Catalyst on Silicon Photocathode for Hydrogen Production. ACS Appl Mater Interfaces 2017; 9:3570-3580. [PMID: 28075553 DOI: 10.1021/acsami.6b11750] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Photoelectrochemical cells are used to split hydrogen and oxygen from water molecules to generate chemical fuels to satisfy our ever-increasing energy demands. However, it is a major challenge to design efficient catalysts to use in the photoelectochemical process. Recently, research has focused on carbon-based catalysts, as they are nonprecious and environmentally benign. Interesting advances have also been made in controlling nanostructure interfaces and in introducing new materials as catalysts in the photoelectrochemical cell. However, these catalysts have as yet unresolved issues involving kinetics and light-transmittance. In this work, we introduce high-transmittance graphene onto a planar p-Si photocathode to produce a hydrogen evolution reaction to dramatically enhance photon-to-current efficiency. Interestingly, double-layer graphene/Si exhibits noticeably improved photon-to-current efficiency and modifies the band structure of the graphene/Si photocathode. On the basis of in-depth electrochemical and electrical analyses, the band structure of graphene/Si was shown to result in a much lower work function than Si, accelerating the electron-to-hydrogen production potential. Specifically, plasma-treated double-layer graphene exhibited the best performance and the lowest work function. We electrochemically analyzed the mechanism at work in the graphene-assisted photoelectrode. Atomistic calculations based on the density functional theory were also carried out to more fully understand our experimental observations. We believe that investigation of the underlying mechanism in this high-performance electrode is an important contribution to efforts to develop high-efficiency metal-free carbon-based catalysts for photoelectrochemical cell hydrogen production.
Collapse
Affiliation(s)
- Uk Sim
- Department of Materials Science and Engineering, Seoul National University , Seoul 08 826, Republic of Korea
| | - Joonhee Moon
- Department of Chemistry, Seoul National University , Seoul 08 826, Republic of Korea
- Korea Basic Science Institute , Gwahangno, Yusung-gu, Daejeon, 305-333, Korea
| | - Joohee Lee
- Department of Materials Science and Engineering, Seoul National University , Seoul 08 826, Republic of Korea
| | - Junghyun An
- Department of Materials Science and Engineering, Seoul National University , Seoul 08 826, Republic of Korea
| | - Hyo-Yong Ahn
- Department of Materials Science and Engineering, Seoul National University , Seoul 08 826, Republic of Korea
| | - Dong Jin Kim
- Department of Nano Science and Technology, Graduate School of Convergence Science and Technology, Seoul National University , Seoul 08 826, Republic of Korea
| | - Insu Jo
- Department of Chemistry, Seoul National University , Seoul 08 826, Republic of Korea
| | - Cheolho Jeon
- Korea Basic Science Institute , Gwahangno, Yusung-gu, Daejeon, 305-333, Korea
| | - Seungwu Han
- Department of Materials Science and Engineering, Seoul National University , Seoul 08 826, Republic of Korea
| | - Byung Hee Hong
- Department of Chemistry, Seoul National University , Seoul 08 826, Republic of Korea
- Department of Nano Science and Technology, Graduate School of Convergence Science and Technology, Seoul National University , Seoul 08 826, Republic of Korea
| | - Ki Tae Nam
- Department of Materials Science and Engineering, Seoul National University , Seoul 08 826, Republic of Korea
| |
Collapse
|
18
|
Lee HE, Yang KD, Yoon SM, Ahn HY, Lee YY, Chang H, Jeong DH, Lee YS, Kim MY, Nam KT. Concave Rhombic Dodecahedral Au Nanocatalyst with Multiple High-Index Facets for CO2 Reduction. ACS Nano 2015; 9:8384-93. [PMID: 26173084 DOI: 10.1021/acsnano.5b03065] [Citation(s) in RCA: 103] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
A concave rhombic dodecahedron (RD) gold nanoparticle was synthesized by adding 4-aminothiophenol (4-ATP) during growth from seeds. This shape is enclosed by stabilized facets of various high-indexes, such as (331), (221), and (553). Because it is driven thermodynamically and stabilized by 4-ATP ligands, the concave RD maintains its structure over a few months, even after rigorous electrochemical reactions. We discussed the mechanism of the shape evolution controlled by 4-ATP and found that both the binding energy of Au-S and the aromatic geometry of 4-ATP are major determinants of Au atom deposition during growth. As a possible application, we demonstrated that the concave RD exhibits superior electrocatalytic performance for the selective conversion of CO2 to CO in aqueous solution.
Collapse
Affiliation(s)
| | | | | | | | | | - Hyejin Chang
- Department of Chemistry Education, Seoul National University , Seoul 151-748, Korea
| | - Dae Hong Jeong
- Department of Chemistry Education, Seoul National University , Seoul 151-748, Korea
| | | | | | | |
Collapse
|
19
|
Ahn HY, Kim M, Ahn YT, Sim JH, Choi ID, Lee SH, Lee JH. The triglyceride-lowering effect of supplementation with dual probiotic strains, Lactobacillus curvatus HY7601 and Lactobacillus plantarum KY1032: Reduction of fasting plasma lysophosphatidylcholines in nondiabetic and hypertriglyceridemic subjects. Nutr Metab Cardiovasc Dis 2015; 25:724-733. [PMID: 26044516 DOI: 10.1016/j.numecd.2015.05.002] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/05/2014] [Revised: 04/30/2015] [Accepted: 05/02/2015] [Indexed: 12/13/2022]
Abstract
BACKGROUND AND AIMS This study evaluated the triglyceride (TG)-lowering effects of consuming dual probiotic strains of Lactobacillus curvatus (L. curvatus) HY7601 and Lactobacillus plantarum (L. plantarum) KY1032 on the fasting plasma metabolome. METHODS AND RESULTS A randomized, double-blind, placebo-controlled study was conducted on 92 participants with hypertriglyceridemia but without diabetes. Over a 12-week testing period, the probiotic group consumed 2 g of powder containing 5 × 10(9) colony-forming units (cfu) of L. curvatus HY7601 and 5 × 10(9) cfu of L. plantarum KY1032 each day, whereas the placebo group consumed the same product without probiotics. Fasting plasma metabolomes were profiled using UPLC-LTQ-Orbitrap MS. After 12 weeks of treatment, the probiotic group displayed a 20% reduction (p = 0.001) in serum TGs and 25% increases (p=0.001) in apolipoprotein A-V (apoA-V). At the 12-week follow-up assessment, the following 11 plasma metabolites were significantly reduced in the probiotic group than the placebo group: palmitoleamide, palmitic amide, oleamide, and lysophosphatidyl choline (lysoPC) containing C14:0, C16:1, C16:0, C17:0, C18:3, C18:2, C18:1, and C20:3. In the probiotic group, changes (▵) in TG were negatively correlated with ▵ apoA-V, which was positively correlated with ▵ FFA. In addition, ▵ FFA was strongly and positively correlated with ▵ lysoPCs in the probiotic group but not the placebo group. CONCLUSIONS The triglyceride-lowering effects of probiotic supplementation, partly through elevated apoA-V, in borderline to moderate hypertriglyceridemic subjects showed reductions in plasma metabolites, fatty acid primary amides and lysoPCs (NCT02215694; http://www.clinicaltrials.gov). Clinical trials: NCT02215694; http://www.clinicaltrials.gov.
Collapse
Affiliation(s)
- H Y Ahn
- Interdisciplinary Course of Science for Aging, Yonsei University, Seoul, South Korea
| | - M Kim
- Research Center for Silver Science, Institute of Symbiotic Life-TECH, Yonsei University, Seoul, South Korea
| | - Y-T Ahn
- Korea Yakult Co., Ltd., Yongin, Gyeonggi, South Korea
| | - J-H Sim
- Korea Yakult Co., Ltd., Yongin, Gyeonggi, South Korea
| | - I-D Choi
- Korea Yakult Co., Ltd., Yongin, Gyeonggi, South Korea
| | - S-H Lee
- Department of Family Practice, National Health Insurance Corporation Ilsan Hospital, Goyang, South Korea
| | - J H Lee
- Research Center for Silver Science, Institute of Symbiotic Life-TECH, Yonsei University, Seoul, South Korea; National Leading Research Laboratory of Clinical Nutrigenetics/Nutrigenomics, Department of Food and Nutrition, College of Human Ecology, Yonsei University, Seoul, South Korea; Department of Food and Nutrition, Brain Korea 21 PLUS Project, College of Human Ecology, Yonsei University, Seoul, South Korea.
| |
Collapse
|
20
|
Jang HL, Lee K, Kang CS, Lee HK, Ahn HY, Jeong HY, Park S, Kim SC, Jin K, Park J, Yang TY, Kim JH, Shin SA, Han HN, Oh KH, Lee HY, Lim J, Hong KS, Snead ML, Xu J, Nam KT. Biofunctionalized ceramic with self-assembled networks of nanochannels. ACS Nano 2015; 9:4447-4457. [PMID: 25827409 PMCID: PMC4485927 DOI: 10.1021/acsnano.5b01052] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Nature designs circulatory systems with hierarchically organized networks of gradually tapered channels ranging from micrometer to nanometer in diameter. In most hard tissues in biological systems, fluid, gases, nutrients and wastes are constantly exchanged through such networks. Here, we developed a biologically inspired, hierarchically organized structure in ceramic to achieve effective permeation with minimum void region, using fabrication methods that create a long-range, highly interconnected nanochannel system in a ceramic biomaterial. This design of a synthetic model-material was implemented through a novel pressurized sintering process formulated to induce a gradual tapering in channel diameter based on pressure-dependent polymer agglomeration. The resulting system allows long-range, efficient transport of fluid and nutrients into sites and interfaces that conventional fluid conduction cannot reach without external force. We demonstrate the ability of mammalian bone-forming cells placed at the distal transport termination of the nanochannel system to proliferate in a manner dependent solely upon the supply of media by the self-powering nanochannels. This approach mimics the significant contribution that nanochannel transport plays in maintaining living hard tissues by providing nutrient supply that facilitates cell growth and differentiation, and thereby makes the ceramic composite "alive".
Collapse
Affiliation(s)
- Hae Lin Jang
- Department of Materials Science and Engineering, Seoul National University, Seoul, 151-744, Korea
| | - Keunho Lee
- Department of Materials Science and Engineering, Seoul National University, Seoul, 151-744, Korea
| | - Chan Soon Kang
- Department of Materials Science and Engineering, Seoul National University, Seoul, 151-744, Korea
| | - Hye Kyoung Lee
- Department of Materials Science and Engineering, Seoul National University, Seoul, 151-744, Korea
| | - Hyo-Yong Ahn
- Department of Materials Science and Engineering, Seoul National University, Seoul, 151-744, Korea
| | - Hui-Yun Jeong
- Department of Materials Science and Engineering, Seoul National University, Seoul, 151-744, Korea
| | - Sunghak Park
- Department of Materials Science and Engineering, Seoul National University, Seoul, 151-744, Korea
| | - Seul Cham Kim
- Department of Materials Science and Engineering, Seoul National University, Seoul, 151-744, Korea
| | - Kyoungsuk Jin
- Department of Materials Science and Engineering, Seoul National University, Seoul, 151-744, Korea
| | - Jimin Park
- Department of Materials Science and Engineering, Seoul National University, Seoul, 151-744, Korea
| | - Tae-Youl Yang
- Department of Materials Science and Engineering, Seoul National University, Seoul, 151-744, Korea
| | - Jin Hong Kim
- Department of Materials Science and Engineering, Seoul National University, Seoul, 151-744, Korea
| | - Seon Ae Shin
- Department of Materials Science and Engineering, Seoul National University, Seoul, 151-744, Korea
| | - Heung Nam Han
- Department of Materials Science and Engineering, Seoul National University, Seoul, 151-744, Korea
| | - Kyu Hwan Oh
- Department of Materials Science and Engineering, Seoul National University, Seoul, 151-744, Korea
| | - Ho-Young Lee
- Department of Nuclear Medicine, Seoul National University, Bundang Hospital, 463-707, Korea
| | - Jun Lim
- Pohang Accelerator Laboratory, POSTECH, Pohang, 790-784, Korea
| | - Kug Sun Hong
- Department of Materials Science and Engineering, Seoul National University, Seoul, 151-744, Korea
| | - Malcolm L. Snead
- Center for Craniofacial Molecular Biology, Herman Ostrow school of Dentistry, University of Southern California, Los Angeles, CA 90033, USA
| | - Jimmy Xu
- School of Engineering and Department of Physics, Brown University, Providence, RI 02912, USA
| | - Ki Tae Nam
- Department of Materials Science and Engineering, Seoul National University, Seoul, 151-744, Korea
| |
Collapse
|
21
|
Jang HL, Lee HK, Jin K, Ahn HY, Lee HE, Nam KT. Phase transformation from hydroxyapatite to the secondary bone mineral, whitlockite. J Mater Chem B 2015; 3:1342-1349. [DOI: 10.1039/c4tb01793e] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Whitlockite (Ca18Mg2(HPO4)2(PO4)12), the second most abundant biomineral in bone, can precipitate from hydroxyapatite (Ca10(PO4)6(OH)2), the major phase in bone.
Collapse
Affiliation(s)
- Hae Lin Jang
- Biomolecular Nanomaterials Laboratory
- Department of Materials Science and Engineering
- Seoul National University
- Seoul 151-744
- Korea
| | - Hye Kyoung Lee
- Biomolecular Nanomaterials Laboratory
- Department of Materials Science and Engineering
- Seoul National University
- Seoul 151-744
- Korea
| | - Kyoungsuk Jin
- Biomolecular Nanomaterials Laboratory
- Department of Materials Science and Engineering
- Seoul National University
- Seoul 151-744
- Korea
| | - Hyo-Yong Ahn
- Biomolecular Nanomaterials Laboratory
- Department of Materials Science and Engineering
- Seoul National University
- Seoul 151-744
- Korea
| | - Hye-Eun Lee
- Biomolecular Nanomaterials Laboratory
- Department of Materials Science and Engineering
- Seoul National University
- Seoul 151-744
- Korea
| | - Ki Tae Nam
- Biomolecular Nanomaterials Laboratory
- Department of Materials Science and Engineering
- Seoul National University
- Seoul 151-744
- Korea
| |
Collapse
|
22
|
Lee HE, Lee HK, Chang H, Ahn HY, Erdene N, Lee HY, Lee YS, Jeong DH, Chung J, Nam KT. Virus templated gold nanocube chain for SERS nanoprobe. Small 2014; 10:3007-3011. [PMID: 24700483 DOI: 10.1002/smll.201400527] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/26/2014] [Revised: 03/21/2014] [Indexed: 06/03/2023]
Abstract
A M13 virus based SERS nanoprobe is presented. Gold nanocubes closely aligned into chains along the length of the virus intensify Raman signals of various reporter molecules serving as specific labels. An antibody is expressed at one end to detect the analyte. This new SERS nanoprobe holds promise for infinitesimal and multiplexed detection of any antigen.
Collapse
Affiliation(s)
- Hye-Eun Lee
- Department of Materials Science and Engineering, Seoul National University, 151-744, Korea
| | | | | | | | | | | | | | | | | | | |
Collapse
|
23
|
Hwang IC, Kim KK, Ahn HY, Suh HS, Oh SW. Effect of the G-protein β3 subunit 825T allele on the change of body adiposity in obese female. Diabetes Obes Metab 2013; 15:284-6. [PMID: 23061407 DOI: 10.1111/dom.12023] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/07/2012] [Revised: 09/22/2012] [Accepted: 10/10/2012] [Indexed: 11/27/2022]
Abstract
No clinical studies on the lipolytic effect of guanine nucleotide-binding protein β3 subunit gene (GNB3) 825T polymorphism have been performed. This study was a subinvestigation of a 12-week randomized controlled trial (NCT01184560) for the additive effect of orlistat on sibutramine treatment. The analysis involved 101 obese females aged 18-49 years, genotyped at the GNB3 825 locus. To exclude any influence from potential confounders, we used an analysis of covariance model. After the intervention, fat mass proportion in total weight loss was significantly lower in subjects with a T allele than in those without a T allele (p = 0.034). GNB3 825T allele was associated with blunted fat mass reduction in obese females.
Collapse
Affiliation(s)
- I C Hwang
- Department of Family Medicine, Gachon University Gil Hospital, Incheon, South Korea
| | | | | | | | | |
Collapse
|
24
|
Abstract
AIMS The aim of this study was to investigate whether increased apolipoprotein B/apolipoprotein A-I ratio is associated with Type 2 diabetes mellitus independent of other risk factors for Type 2 diabetes. METHODS A total of 70,063 subjects (41,391 men and 28,672 women; mean age 41.5 years) who visited the Health Screening Center at Kangbuk Samsung Hospital for a routine medical check-up between January 2009 and December 2009 were enrolled in this study. RESULTS The mean apolipoprotein B/apolipoprotein A-I ratio in the study subjects was 0.66 ± 0.18. The prevalence of Type 2 diabetes increased across the apolipoprotein B/apolipoprotein A-I ratio quartiles (1.0%, 1.6%, 2.9%, and 4.8% for the 1st through 4th quartiles, respectively, P < 0.001) and homeostasis model assessment-insulin resistance (HOMA2-IR) also showed an increasing tendency by quartile (P < 0.001). The apolipoprotein B/apolipoprotein A-I ratio was correlated with age, adiposity, blood pressure, HOMA2-IR value, fasting glucose levels, and other inflammatory marker, including high-sensitivity C-reactive protein, and lipoprotein (a) levels (all P < 0.001). In a multiple logistic regression model, the highest apolipoprotein B/apolipoprotein A-I ratio quartile was associated with Type 2 diabetes, even after controlling for other risk factors for diabetes, such as age, gender, BMI, systolic blood pressure, HOMA2-IR values, high-sensitivity C-reactive protein levels, family history of diabetes, presence of metabolic syndrome, and conventional lipid parameters (odds ratio 1.31; 95% confidence interval 1.17-1.46, P < 0.001). CONCLUSIONS The apolipoprotein B/apolipoprotein A-I ratio was found to be associated with Type 2 diabetes independent of other risk factors for diabetes and conventional lipid parameters.
Collapse
Affiliation(s)
- Y C Hwang
- Division of Endocrinology and Metabolism, Department of Medicine, Kyung Hee University School of Medicine, Kyung Hee University Hospital at Gangdong, Korea
| | | | | | | | | |
Collapse
|
25
|
Kim WJ, Park CY, Park SE, Rhee EJ, Lee WY, Oh KW, Park SW, Kim SW, Park HS, Kim YJ, Song SJ, Ahn HY. Serum 1,5-anhydroglucitol is associated with diabetic retinopathy in Type 2 diabetes. Diabet Med 2012; 29:1184-90. [PMID: 22332964 DOI: 10.1111/j.1464-5491.2012.03613.x] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
AIMS To determine whether there is a relationship between 1,5-anhydroglucitol (1,5-AG), a marker of postprandial hyperglycaemia and glycaemic variability, and the presence of diabetic retinopathy and albuminuria in patients with Type 2 diabetes. METHODS Five hundred and sixty-seven patients with Type 2 diabetes (serum creatinine < 133 μmol/l), who were enrolled in the Seoul Metro-City Diabetes Prevention Program (SMC-DPP), were cross-sectionally assessed by multivariate logistic regression analysis. RESULTS After controlling for age, sex, binary HbA(1c) levels, duration of diabetes, triglyceride, systolic blood pressure, smoking status, history of hypertension and dyslipidaemia, and the use of angiotensin-converting enzyme inhibitor/angiotensin receptor blocker medication, the odds ratios (95% CI) of diabetic retinopathy were 2.86 (1.12-7.25) for the first (lowest) quartile of 1,5-anhydroglucitol, 2.87 (1.25-6.61) for the second quartile and 0.88 (0.35-2.22) for the third quartile compared with the fourth quartile (P for trend = 0.010). Conversely, the associations between 1,5-anhydroglucitol and clinical albuminuria were non-significant after adjustment. Subjects with low 1,5-anhydroglucitol (< 10.0 μg/ml) were more likely to experience diabetic retinopathy than those with high 1,5-anhydroglucitol (≥ 10.0 μg/ml) under moderate glucose control (HbA(1c) < 8%, 64 mmol/mol) and there were no significant differences in the prevalence of diabetic retinopathy between the subgroup with HbA(1c) < 8% (64 mmol/mol) and low 1,5-anhydroglucitol and the subgroup with HbA(1c) ≥ 8% (64 mmol/mol). CONCLUSIONS 1,5-Anhydroglucitol levels show close associations with diabetic retinopathy, especially among patients under moderate glucose control, but not with albuminuria. These results suggest that 1,5-anhydroglucitol might be a complementary marker for targeting higher risk group.
Collapse
Affiliation(s)
- W J Kim
- Department of Endocrinology and Metabolism, Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine, Seoul, Korea
| | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
26
|
Cho BS, Lee MS, Lee MK, Choi YJ, Kim CN, Kang YJ, Park JS, Ahn HY. Treatment guidelines for isolated dissection of the superior mesenteric artery based on follow-up CT findings. Eur J Vasc Endovasc Surg 2011; 41:780-5. [PMID: 21333559 DOI: 10.1016/j.ejvs.2010.12.022] [Citation(s) in RCA: 74] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2010] [Accepted: 12/20/2010] [Indexed: 12/28/2022]
Abstract
OBJECTIVES The treatment guidelines for isolated superior mesenteric artery dissection (SMAD) are not well established. The purpose of this study was to report a single-centre series of SMAD and propose treatment guidelines. MATERIALS AND METHODS Between November 2004 and December 2009, 30 patients were diagnosed with SMAD. We retrospectively reviewed their medical records. RESULTS The subjects included 26 men and four women, with a mean age of 55.1 years. The chief complaint was abdominal pain in 17 patients, whereas 13 patients were asymptomatic. The mean follow-up was 38.3 months. The radiographic findings included intimal flap with a false lumen in 20 patients and intramural haematoma in 10 patients. The treatments included observation in 18 patients, anticoagulation in five patients, stenting in six patients and surgery in one patient. During follow-up (mean 15.6 months), there was no change in the computed tomography scans of seven patients, improvement was observed in four patients and complete resolution was observed in four patients. All patients, including the symptomatic patients, remained asymptomatic during follow-up. CONCLUSIONS Most patients with SMAD can be successfully managed with conservative treatment. Surgical treatment or percutaneous intervention can be reserved for patients with severe mesenteric ischaemia and those for whom the initial conservative treatment fails.
Collapse
Affiliation(s)
- B S Cho
- Department of Surgery, Eulji University School of Medicine and Eulji University Hospital, 1306 Dunsan-dong, Seo-gu, Daejeon, South Korea.
| | | | | | | | | | | | | | | |
Collapse
|
27
|
Kim DH, Im JS, Kang JW, Kim EJ, Ahn HY, Kim J. A new synthesis route to nanocrystalline olivine phosphates and their electrochemical properties. J Nanosci Nanotechnol 2007; 7:3949-3953. [PMID: 18047094] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
LiFePO4 nanoparticles were synthesized in various polyol mediums without any further heating. The LiFePO4 samples synthesized in polyol mediums exhibited average sizes of 20, 20, 50, and 50 nm with orthorhombic-like shapes. The XRD patterns were indexed on the basis of an olivine structure (space group : Pnma) except for the sample prepared in EG polyol medium. The LiFePO4 samples prepared in EG, DEG, TEG, and TrEG polyol mediums show the reversible capacity of 120 mA h/g, 144 mA h/g, 159 mA h/g, and 167 mA h/g at current density of 0.1 mA/cm2 with no capacity fading and excellent cycle retentions during extended cycles. Especially, the samples showed the excellent performances at high rate of 30 C and 60 C with high capacity retention. It is a speculation that nanometer size materials (approximately 50 nm) and a uniform size-distribution with highly crystallined phase may affect the excellent performances at high rate current densities.
Collapse
Affiliation(s)
- D H Kim
- Department of Materials Science and Engineering, Chonnam National University, 300 Yongbongdong, Bukgu, Gwangju 500-757, South Korea
| | | | | | | | | | | |
Collapse
|
28
|
Moon HB, Ahn HY, Shin JC. Expression of hepatocyte growth factor and its receptor in the placental basal plate in pre-eclamptic pregnancies. Int J Gynaecol Obstet 2004; 83:203-6. [PMID: 14550599 DOI: 10.1016/s0020-7292(03)00192-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Affiliation(s)
- H B Moon
- Department of Obstetrics and Gynecology, Division of Maternal-Fetal Medicine, Medical College, Catholic University of Korea, Seoul, South Korea
| | | | | |
Collapse
|
29
|
Shin EY, Min DS, Shin JC, Shin KS, Hyun MS, Ha KS, Kim HS, Ahn HY, Kim EG. Involvement of phospholipase D in oxidative stress-induced necrosis of vascular smooth muscle cells. FEBS Lett 2001; 508:277-81. [PMID: 11718730 DOI: 10.1016/s0014-5793(01)03059-9] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Phospholipase D (PLD) has been associated with necrosis. However, it is not clear whether PLD plays a causative role in this cellular process. We investigated the role of PLD in oxidative stress-induced necrosis of vascular smooth muscle cells (VSMCs). Pervanadate (hydrogen peroxide plus orthovanadate) but not hydrogen peroxide alone activated PLD in a dose- and time-dependent manner. Exposure of VSMCs to pervanadate resulted in necrosis. Pretreatment with butan-1-ol, a PLD inhibitor, attenuated both pervanadate-induced necrosis and increase of intracellular Ca(2+). Removal of extracellular Ca(2+) inhibited pervanadate-induced necrosis by 50%. These results suggest that PLD activation mediates pervanadate-induced necrosis of VSMCs, which is at least partly due to Ca(2+) toxicity.
Collapse
Affiliation(s)
- E Y Shin
- Department of Biochemistry, College of Medicine and Research Institute for Genetic Engineering, Chungbuk National University, Cheongju, South Korea
| | | | | | | | | | | | | | | | | |
Collapse
|
30
|
Zhang YH, Park YS, Kim TJ, Fang LH, Ahn HY, Hong JT, Kim Y, Lee CK, Yun YP. Endothelium-dependent vasorelaxant and antiproliferative effects of apigenin. Gen Pharmacol 2000; 35:341-7. [PMID: 11922965 DOI: 10.1016/s0306-3623(02)00113-1] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
This study was designed to determine whether the relaxant effect of apigenin was endothelium dependent and to examine the possible antiproliferative effect of apigenin. Apigenin relaxed the phenylephrine-precontracted endothelium-intact aortic rings with IC(50) value of 3.7+/-0.5 microM and removal of a functional endothelium significantly attenuated this relaxation (IC(50)=8.2+/-0.9 microM). However, apigenin did not affect the 0.1 microM phorbol 12,13-dibutyrate-induced contraction (IC(50)=34.6+/-1.2 microM) within the concentration range that relaxed the phenylephrine-contracted arteries, suggesting that apigenin did not influence protein kinase C-mediated contractile mechanisms in rat aorta. Pretreatment of apigenin significantly potentiated the relaxant effect of acetylcholine on phenylephrine-induced contraction. Pretreatment with N(G)-nitro-L-arginine methyl ester (L-NAME) or methylene blue reduced the relaxant effect of apigenin. Apigenin (10 microM) increased the guanosine 3',5'-cyclic monophosphate (cGMP) content of endothelium-intact tissues. Pretreatment with L-NAME (100 microM) or removal of endothelium significantly suppressed the effect of apigenin on cGMP production. In addition, apigenin significantly inhibited [3H]thymidine incorporation into DNA of primary cultured rat aortic smooth muscle cell in a dose-dependent manner. These findings suggest that besides influx and release of Ca(2+), nitric oxide (NO) and cGMP may account for the apigenin-induced endothelium-dependent relaxation and hypotensive activity. Both vasorelaxant and antiproliferative activities may contribute to a benefit of apigenin in the vascular system.
Collapse
MESH Headings
- Animals
- Aorta, Thoracic/cytology
- Aorta, Thoracic/drug effects
- Aorta, Thoracic/metabolism
- Apigenin
- Cell Division/drug effects
- Cells, Cultured
- Cyclic GMP/metabolism
- Endothelium, Vascular/cytology
- Endothelium, Vascular/physiology
- Flavonoids/pharmacology
- Isometric Contraction/drug effects
- Male
- Methylene Blue/pharmacology
- Muscle Relaxation/drug effects
- Muscle, Smooth, Vascular/cytology
- Muscle, Smooth, Vascular/drug effects
- Muscle, Smooth, Vascular/metabolism
- NG-Nitroarginine Methyl Ester/pharmacology
- Phorbol 12,13-Dibutyrate/pharmacology
- Rats
- Rats, Sprague-Dawley
- Thymidine/metabolism
Collapse
Affiliation(s)
- Y H Zhang
- Department of Pharmacology, The School of Basic Medical Science, Peking University, Beijing 100083, China
| | | | | | | | | | | | | | | | | |
Collapse
|
31
|
Abstract
The native form of some proteins such as strained plasma serpins (serine protease inhibitors) and the spring-loaded viral membrane fusion proteins are in a metastable state. The metastable native form is thought to be a folding intermediate in which conversion into the most stable state is blocked by a very high kinetic barrier. In an effort to understand how the spontaneous conversion of the metastable native form into the most stable state is prevented, we designed mutations of alpha1-antitrypsin, a prototype serpin, which can bypass the folding barrier. Extending the reactive center loop of alpha1-antitrypsin converts the molecule into a more stable state. Remarkably, a 30-residue loop extension allows conversion into an extremely stable state, which is comparable to the relaxed cleaved form. Biochemical data strongly suggest that the strain release is due to the insertion of the reactive center loop into the major beta-sheet, A sheet, as in the known stable conformations of serpins. Our results clearly show that extending the reactive center loop is sufficient to bypass the folding barrier of alpha1-antitrypsin and suggest that the constrain held by polypeptide connection prevents the conversion of the native form into the lowest energy state.
Collapse
Affiliation(s)
- H Im
- Protein Strain Research Center, Korea Institute of Science and Technology, Cheongryang, Seoul
| | | | | |
Collapse
|
32
|
Ahn HY, Hadizadeh KR, Seul C, Yun YP, Vetter H, Sachinidis A. Epigallocathechin-3 gallate selectively inhibits the PDGF-BB-induced intracellular signaling transduction pathway in vascular smooth muscle cells and inhibits transformation of sis-transfected NIH 3T3 fibroblasts and human glioblastoma cells (A172). Mol Biol Cell 1999; 10:1093-104. [PMID: 10198059 PMCID: PMC25235 DOI: 10.1091/mbc.10.4.1093] [Citation(s) in RCA: 141] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
Abstract
Enhanced activity of receptor tyrosine kinases such as the PDGF beta-receptor and EGF receptor has been implicated as a contributing factor in the development of malignant and nonmalignant proliferative diseases such as cancer and atherosclerosis. Several epidemiological studies suggest that green tea may prevent the development of cancer and atherosclerosis. One of the major constituents of green tea is the polyphenol epigallocathechin-3 gallate (EGCG). In an attempt to offer a possible explanation for the anti-cancer and anti-atherosclerotic activity of EGCG, we examined the effect of EGCG on the PDGF-BB-, EGF-, angiotensin II-, and FCS-induced activation of the 44 kDa and 42 kDa mitogen-activated protein (MAP) kinase isoforms (p44(mapk)/p42(mapk)) in cultured vascular smooth muscle cells (VSMCs) from rat aorta. VSMCs were treated with EGCG (1-100 microM) for 24 h and stimulated with the above mentioned agonists for different time periods. Stimulation of the p44(mapk)/p42(mapk) was detected by the enhanced Western blotting method using phospho-specific MAP kinase antibodies that recognized the Tyr204-phosphorylated (active) isoforms. Treatment of VSMCs with 10 and 50 microM EGCG resulted in an 80% and a complete inhibition of the PDGF-BB-induced activation of MAP kinase isoforms, respectively. In striking contrast, EGCG (1-100 microM) did not influence MAP kinase activation by EGF, angiotensin II, and FCS. Similarly, the maximal effect of PDGF-BB on the c-fos and egr-1 mRNA expression as well as on intracellular free Ca2+ concentration was completely inhibited in EGCG-treated VSMCs, whereas the effect of EGF was not affected. Quantification of the immunoprecipitated tyrosine-phosphorylated PDGF-Rbeta, phosphatidylinositol 3'-kinase, and phospholipase C-gamma1 by the enhanced Western blotting method revealed that EGCG treatment effectively inhibits tyrosine phosphorylation of these kinases in VSMCs. Furthermore, we show that spheroid formation of human glioblastoma cells (A172) and colony formation of sis-transfected NIH 3T3 cells in semisolid agar are completely inhibited by 20-50 microM EGCG. Our findings demonstrate that EGCG is a selective inhibitor of the tyrosine phosphorylation of PDGF-Rbeta and its downstream signaling pathway. The present findings may partly explain the anti-cancer and anti-atherosclerotic activity of green tea.
Collapse
MESH Headings
- 3T3 Cells
- Animals
- Antineoplastic Agents/pharmacology
- Aorta
- Becaplermin
- Brain Neoplasms
- Calcium/metabolism
- Calcium-Calmodulin-Dependent Protein Kinases/metabolism
- Catechin/analogs & derivatives
- Catechin/pharmacology
- Cell Transformation, Neoplastic
- Cells, Cultured
- Glioblastoma
- Humans
- Kinetics
- Mice
- Mitogen-Activated Protein Kinase 1/metabolism
- Mitogen-Activated Protein Kinase 3
- Mitogen-Activated Protein Kinases
- Muscle, Smooth, Vascular/cytology
- Muscle, Smooth, Vascular/drug effects
- Muscle, Smooth, Vascular/physiology
- Oncogene Proteins v-sis
- Phosphorylation
- Phosphotyrosine/metabolism
- Platelet-Derived Growth Factor/pharmacology
- Proto-Oncogene Proteins c-sis
- Rats
- Rats, Inbred WKY
- Recombinant Proteins/metabolism
- Retroviridae Proteins, Oncogenic/genetics
- Retroviridae Proteins, Oncogenic/metabolism
- Signal Transduction/drug effects
- Signal Transduction/physiology
- Tea
- Transfection
- Tumor Cells, Cultured
Collapse
Affiliation(s)
- H Y Ahn
- Department of Pharmacology, College of Medicine, Chungbuk National University, Cheongju 361-763, South Korea
| | | | | | | | | | | |
Collapse
|
33
|
Kim HS, Zhang YH, Oh KW, Ahn HY. Vasodilating and hypotensive effects of fangchinoline and tetrandrine on the rat aorta and the stroke-prone spontaneously hypertensive rat. J Ethnopharmacol 1997; 58:117-123. [PMID: 9406900 DOI: 10.1016/s0378-8741(97)00092-5] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Comparative studies of the effects of tetrandrine (TET) and fangchinoline (FAN), two major components of the Radix of Stephannia tetrandrae, on vasodilations and on calcium movement in vascular smooth muscle, and studies of hypotensive effects on stroke-prone spontaneously hypertensive rats (SHRSP) were performed in the following experiments. TET and FAN inhibited high K+ (65.4 mM) and induced sustained contraction in the rat aorta smooth muscle strips. IC50 values for TET and FAN were 0.27 +/- 0.05 microM (n = 6) and 9.53 +/- 1.57 microM (n = 6), respectively, and this inhibition was antagonized by increasing the Ca2+ concentration in the medium. The IC50 of TET for norepinephrine (NE)-induced contraction (0.86 +/- 0.04 g) was 3.08 +/- 0.05 microM (n = 4), and the IC50 of FAN for NE-induced contraction (0.88 +/- 0.07 g) was 14.20 +/- 0.40 microM (n = 4). At the molecular level, radiolabelled 45Ca2+ uptake tests revealed that TET and FAN also inhibited high K+ (65.4 mM) and 1 microM NE-stimulated Ca2+ influx in rat aorta strips at the maximal concentration was needed to inhibit the contraction. TET (3 mg/kg) and FAN (30 mg/kg) administered by intravenous (i.v.) bolus injection also lowered the mean arterial pressure (MAP) significantly during the period of observation in conscious SHRSP, respectively. These results showed that TET was more potent than FAN in blocking calcium channels and antihypertensive activity.
Collapse
Affiliation(s)
- H S Kim
- Department of Pharmacology, College of Pharmacy, Chungbuk National University, Cheongju, South Korea
| | | | | | | |
Collapse
|
34
|
Abstract
This study was designed to test the hypothesis that 8-Br-cAMP and 8-Br-cGMP dependent relaxation of phorbol dibutyrate stimulated contractions of intact rat aorta are independent of changes in the level of myosin light chain phosphorylation. Phorbol dibutyrate stimulated contraction with a concomitant increase in myosin light chain phosphorylation in normal tissues and without an increase in myosin light chain phosphorylation in calcium-depleted tissues. Phorbol dibutyrate stimulated contractions in normal CaCl2-containing physiological salt solution were relaxed in a concentration-dependent manner by 8-Br-cAMP and 8-Br-cGMP. Phorbol dibutyrate-induced contractions in the absence of Ca2+ were only relaxed by 8-Br-cGMP; 8-Br-cAMP had no effect. The relaxation induced by 8-Br-cGMP was associated with a decrease in myosin light chain phosphorylation suggesting that cGMP-dependent protein kinase may alter the activity of either the myosin light chain kinase or phosphatase. The relaxation induced by 8-Br-cAMP was not associated with a decrease in phosphorylation suggesting that cAMP-dependent protein kinase may uncouple myosin light chain phosphorylation from force.
Collapse
Affiliation(s)
- H Y Ahn
- Department of Pharmacology, College of Medicine, Chungbuk National University, Cheongju, South Korea
| | | | | | | | | |
Collapse
|
35
|
Malinowski H, Marroum P, Uppoor VR, Gillespie W, Ahn HY, Lockwood P, Henderson J, Baweja R, Hossain M, Fleischer N, Tillman L, Hussain A, Shah V, Dorantes A, Zhu R, Sun H, Kumi K, Machado S, Tammara V, Ong-Chen TE, Mahayni H, Lesko L, Williams R. Draft guidance for industry extended-release solid oral dosage forms. Development, evaluation and application of in vitro-in vivo correlations. Adv Exp Med Biol 1997; 423:269-88. [PMID: 9269503 DOI: 10.1007/978-1-4684-6036-0_25] [Citation(s) in RCA: 83] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
|
36
|
Rokolya A, Ahn HY, Moreland S, van Breemen C, Moreland RS. A hypothesis for the mechanism of receptor and G-protein-dependent enhancement of vascular smooth muscle myofilament Ca2+ sensitivity. Can J Physiol Pharmacol 1994; 72:1420-6. [PMID: 7767888 DOI: 10.1139/y94-205] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Agonist activation enhances smooth muscle myofilament Ca2+ sensitivity. The increased force accompanying receptor stimulation (over Ca2+ alone) requires GTP and is reversed by GDP beta S, demonstrating a G-protein dependence. Protein kinase C (PKC) activators, such as phorbol esters, mimic and PKC inhibitors block the agonist-induced increase in Ca2+ sensitivity, suggesting a role for PKC in the regulation of Ca2+ sensitivity. Myosin light chain (MLC) phosphorylation levels are transiently increased by agonist stimulation, but steady-state levels of MLC phosphorylation are similar to those in response to Ca2+ alone. Thus, G-protein-mediated inhibition of MLC phosphatase may account for the initial increase in force development but not the increase in steady-state force. In contrast to MLC, calponin phosphorylation levels are maintained during agonist stimulation of intact vascular smooth muscle. We propose that stimulation of smooth muscle by membrane depolarization increases MLC phosphorylation, but as a result of inhibition by unphosphorylated calponin only a portion of the phosphorylated cross bridges attach to actin. Agonist stimulation produces the same steady-state level of MLC phosphorylation but also leads to calponin phosphorylation via a PKC-dependent pathway. Thus, during agonist stimulation, all phosphorylated cross bridges can interact with actin, thereby generating significantly greater levels of force.
Collapse
Affiliation(s)
- A Rokolya
- Bockus Research Institute, Graduate Hospital, Philadelphia, PA 19146, USA
| | | | | | | | | |
Collapse
|
37
|
Ahn HY, Shiu GK, Trafton WF, Doyle TD. Resolution of the enantiomers of ibuprofen; comparison study of diastereomeric method and chiral stationary phase method. J Chromatogr B Biomed Appl 1994; 653:163-9. [PMID: 8205243 DOI: 10.1016/0378-4347(93)e0425-p] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
In this study, an indirect diastereomeric method and a direct method utilizing a chiral stationary phase (CSP) were investigated for the resolution of ibuprofen enantiomers. In the indirect method, ethylchloroformate (ECF) and 2-ethoxy-1-1-ethoxycarbonyl-1,2-dihydroquinoline (EEDQ) were utilized as first-step derivatizing reagents in acetonitrile or toluene. In the direct CSP method, ibuprofen enantiomers were derivatized to p-nitrobenzyl ureides and then resolved on an (R)-(-)-(1-naphthyl)ethylurea CSP column. The derivatization procedure took place in 10 min with an overall inversion efficiency of 90.3%. Racemization was not observed under the derivatization conditions used. The HPLC-CSP method was utilized to study the pharmacokinetics of ibuprofen enantiomers in dog plasma after a single oral administration of 200 mg of ibuprofen racemate.
Collapse
Affiliation(s)
- H Y Ahn
- Biopharmaceutic Research Branch, Food and Drug Administration, Washington, DC 20204
| | | | | | | |
Collapse
|
38
|
Nishimura J, Moreland S, Ahn HY, Kawase T, Moreland RS, van Breemen C. Endothelin increases myofilament Ca2+ sensitivity in alpha-toxin-permeabilized rabbit mesenteric artery. Circ Res 1992; 71:951-9. [PMID: 1325299 DOI: 10.1161/01.res.71.4.951] [Citation(s) in RCA: 74] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
This study was designed to investigate the mechanism of endothelin-1 (ET-1) contractions in Staphylococcus alpha-toxin-permeabilized vascular smooth muscle. Rabbit small mesenteric arteries permeabilized with alpha-toxin were mounted for isometric or isotonic force recording or were processed for determination of myosin light chain (MLC) phosphorylation levels. Addition of 100 nM ET-1 plus 10 microM GTP significantly enhanced myofilament Ca2+ sensitivity as compared with the addition of Ca2+ alone (EC50, 0.47 microM Ca2+ for Ca2+ alone and 0.13 microM Ca2+ for ET-1 plus (GTP). This enhanced sensitivity was reversed by GDP beta S. ET-1-induced contractions were relaxed at a constant [Ca2+] by the addition of 30 microM cAMP or cGMP, demonstrating a direct effect of the cyclic nucleotides on contractile regulation. Inhibition of protein kinase C activity by 100 nM staurosporine relaxed ET-1 plus GTP-induced contractions, and pretreatment with 40 microM chelerythrine inhibited the ET-1 plus GTP increase in force. At 0.32 microM Ca2+, steady-state levels of shortening velocity were not increased by ET-1 plus GTP, although steady-state levels of MLC phosphorylation were significantly enhanced. The ET-1-induced increase in MLC phosphorylation was not altered by changes in [Ca2+], whereas the shortening velocity was Ca2+ dependent, suggesting that the increase MLC phosphorylation level may be the result of protein kinase C, rather than MLC kinase, activation. These results are consistent with the hypothesis that ET-1 increases myofilament Ca2+ sensitivity by a G protein-dependent pathway and subsequent activation of protein kinase C.(ABSTRACT TRUNCATED AT 250 WORDS)
Collapse
Affiliation(s)
- J Nishimura
- Department of Molecular and Cellular Pharmacology, University of Miami School of Medicine
| | | | | | | | | | | |
Collapse
|
39
|
Moreland S, Nishimura J, van Breemen C, Ahn HY, Moreland RS. Transient myosin phosphorylation at constant Ca2+ during agonist activation of permeabilized arteries. Am J Physiol 1992; 263:C540-4. [PMID: 1514596 DOI: 10.1152/ajpcell.1992.263.2.c540] [Citation(s) in RCA: 55] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Norepinephrine (NE) plus guanosine triphosphate (GTP) increases myofilament Ca2+ sensitivity in alpha-toxin-permeabilized smooth muscle. We used alpha-toxin-permeabilized rabbit mesenteric arteries to determine the temporal relationships among force, myosin light chain (MLC) phosphorylation, stiffness, and shortening velocity during contractions in response to Ca2+ alone and to the same [Ca2+] in the presence of NE plus GTP. The addition of NE plus GTP caused a marked increase in the tonic contraction but only transiently elevated the level of MLC phosphorylation over that observed in the presence of Ca2+ alone. NE plus GTP induced similar increases in force and stiffness, but shortening velocity depended solely on the [Ca2+]. A regulated MLC phosphatase could explain the initial increase in force and MLC phosphorylation, but not the maintenance of enhanced force while MLC phosphorylation levels fell to values similar to those in response to Ca2+ alone. Therefore, additional elements must be involved in the maintenance of the receptor and G protein-dependent increase in myofilament Ca2+ sensitivity.
Collapse
Affiliation(s)
- S Moreland
- Department of Pharmacology, Bristol-Myers Squibb Pharmaceutical Research Institute, Princeton, New Jersey 08543
| | | | | | | | | |
Collapse
|
40
|
Ahn HY, Kang SE, Chang KC, Karaki H. Dibutyryl cyclic AMP and forskolin inhibit phosphatidylinositol hydrolysis, Ca2+ influx and contraction in vascular smooth muscle. Jpn J Pharmacol 1992; 59:263-5. [PMID: 1331585 DOI: 10.1254/jjp.59.263] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Dibutyryl cyclic AMP and forskolin inhibited the contraction induced by norepinephrine (NE) more strongly than the high K(+)-induced contraction in isolated rat aorta. These inhibitors inhibited the 45Ca2+ influx stimulated by NE but not that by high K+, and they inhibited NE-induced inositol monophosphate accumulation. These results suggest that cAMP inhibits NE-induced contraction, at least partly, by inhibiting the alpha-adrenoceptor-mediated signal transduction and high K(+)-induced contraction by decreasing Ca2+ sensitivity but not Ca2+ influx.
Collapse
Affiliation(s)
- H Y Ahn
- Department of Pharmacology, College of Medicine, Chungbuk National University, Cheongju, Korea
| | | | | | | |
Collapse
|
41
|
Abstract
The renal clearance of ibuprofen enantiomer was studied separately in the isolated perfused rat kidney at initial perfusate concentrations of 10 micrograms/ml (n = 4) and 100 micrograms/ml (n = 4). Perfusate and urine samples were measured for R(-) and S(+)-ibuprofen using a stereospecific HPLC assay; urine samples were also analyzed after alkaline hydrolysis. Functional viability of the kidney was assured by determining the fractional excretion of glucose and glomerular filtration rate (GFR) at similar perfusion pressures. The clearance of ibuprofen was equivalent to the apparent formation clearance of conjugated enantiomer since unchanged ibuprofen could not be detected in the urine. At 10 and 100 micrograms/ml, the clearance (+/- SD) of R(-)-ibuprofen was 2.50 +/- 1.28 and 2.19 +/- 1.42 microliters/min, respectively. At 100 micrograms/ml, the clearance of S(+)-ibuprofen was 0.805 +/- 0.290 microliters/min. The protein binding of ibuprofen was found to be concentration dependent and favored the R(-)-enantiomer. The excretion ratio (clearance corrected for free fraction and GFR) of R(-)-ibuprofen was 0.398 +/- 0.209 and 0.295 +/- 0.209 for perfusate concentrations of 10 and 100 micrograms/ml, respectively. The excretion ratio of S(+)-ibuprofen was 0.0886 +/- 0.0335 for perfusate concentrations of 100 micrograms/ml. These results demonstrate that the sum of renal mechanisms involved for the clearance of R(-)- and S(+)-ibuprofen was net reabsorption. Ibuprofen was recovered in the urine solely as conjugated material and no evidence of R(-) to S(+) conversion was observed. In addition, the data suggest that R(-)-ibuprofen is cleared through the kidney faster than its S(+)-enantiomer.
Collapse
Affiliation(s)
- H Y Ahn
- College of Pharmacy, University of Michigan, Ann Arbor 48109-1065
| | | | | | | | | |
Collapse
|
42
|
Abstract
The pharmacokinetics of ibuprofen are complicated by the unidirectional metabolic inversion of the (-)-R- to (+)-S-enantiomer. Chiral inversion is of therapeutic significance since the drug's pharmacologic activity has been shown to depend upon the (+)-S-isomer. As a result, the present study was undertaken to determine if chiral inversion occurs systemically and to elucidate further the kinetics of the inversion process. Experiments were performed in the beagle dog after intravenous bolus injections of ibuprofen enantiomers separately [100 mg (-)-R, n = 4; 100 mg (+)-S, n = 4] and as admixtures of varying proportions [100 mg (-)-R + 100 mg (+)-S, n = 4; 100 mg (-)-R + 200 mg (+)-S, n = 2]. Plasma samples of (-)-R- and (+)-S-enantiomers were measured by a stereospecific HPLC assay after all drug administrations. Based on the area under the plasma concentration-time curves for (+)-S after administration of each enantiomer alone, chiral inversion was 70 to 75%. A progressive reduction in total plasma clearance of (-)-R-ibuprofen is also observed as increasing amounts of (+)-S-enantiomer are added to the system. The results demonstrate that chiral inversion occurs to a significant extent in the systemic circulation in dog and that R-to-S inversion of ibuprofen may be inhibited by its (+)-S-enantiomer.
Collapse
Affiliation(s)
- H Y Ahn
- College of Pharmacy, University of Michigan, Ann Arbor 48109-1065
| | | | | |
Collapse
|
43
|
Ahn HY, Sue LF, Ma JK, Pinkstaff CA, Pore RS, Overman DO, Malanga CJ. Synthesis and secretion of mucous glycoprotein by the gill of Mytilus edulis. I. Histochemical and chromatographic analysis of [14C]glucosamine bioincorporation. Biochim Biophys Acta 1988; 966:122-32. [PMID: 3390462 DOI: 10.1016/0304-4165(88)90136-5] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
The ability of the isolated gill epithelium of Mytilus edulis to incorporate [14C]glucosamine as a precursor in the biosynthesis and secretion of mucous glycoproteins was investigated. Localization of mucous cells in the gill filament was achieved using histochemical staining techniques. Mucus cells containing neutral and acidic mucins were found in the lateral region, whereas mucus cells containing primarily neutral or sulfated mucins were found in the abfrontal region. Autoradiographic results showed that in both regions, the mucous cells were rich in content of the incorporated radiolabel. The secreted glycoproteins containing the incorporated radiolabel were analyzed by column chromatography using Bio-Gel P-2 and P-6. Two populations of the glycoproteins differing in molecular size were isolated. Upon alkaline reductive borohydride cleavage of the O-glycosidic linkages of the high molecular weight protein, about 70% of the radiolabel and 85% of the carbohydrate content were removed from the protein. The alkaline borohydride cleavage resulted in the formation of at least six oligosaccharide chains of various lengths of sugar units. Gas chromatographic analysis of the carbohydrate composition shows that the glycoproteins contain N-acetylglucosamine, N-acetylgalactosamine, and galactose, fucose, and mannose as the neutral monosaccharides. The above results indicate that the isolated gill epithelium of M. edulis is capable of incorporating [14C]glucosamine in the synthesis of secretable mucin-type glycoproteins.
Collapse
Affiliation(s)
- H Y Ahn
- School of Pharmacy, West Virginia University Medical Center, Morgantown 26506
| | | | | | | | | | | | | |
Collapse
|
44
|
Abstract
1. The effects of procaine on muscle tension and 45Ca2+ movements were investigated in vascular smooth muscle of the rabbit aorta and intestinal smooth muscle of the taenia isolated from guinea-pig caecum. 2. Procaine (10 mM) induced a contraction in the taenia but had little effect on the resting tension in the aorta. 3. Procaine, 0.5-10 mM, relaxed the sustained contractions induced by 65.4 mM KCl and 10(-6) M noradrenaline in the aorta, and by 45.4 mM KCl, 10(-6) M carbachol and 10(-6) M histamine in the taenia. The inhibitory effect of procaine on the high K+-induced contractions was antagonized by external Ca2+ but not by the Ca2+ channel activators, Bay K 8644 and CGP 28,392. 4. 45Ca2+ uptake was increased by high K+ or noradrenaline in the aorta and by high K+ or carbachol in the taenia. The increments were inhibited by procaine at the concentrations needed to inhibit the muscle contractions. 5. In a Ca2+-free solution, noradrenaline and caffeine induced a transient contraction in the aorta, whereas a second application of each stimulant was almost ineffective. Addition of 1-10 mM procaine shortly before the first application of the stimulant inhibited the contraction. After washing the muscle with a Ca2+-free solution without procaine, the second application of the stimulant induced a greater contraction than that in control muscle without procaine pretreatment. 6. Noradrenaline and caffeine released 45Ca2+ from a cellular site in the aorta. Procaine inhibited the effects of these stimulants. 7. It was concluded that procaine may inhibit both the opening of Ca2+ channels and the release of Ca2 + from cellular stores and the former but not the latter effect may be attributable to a local anaesthetic action.
Collapse
Affiliation(s)
- H Y Ahn
- Department of Veterinary Pharmacology, Faculty of Agriculture, University of Tokyo, Japan
| | | |
Collapse
|
45
|
Abstract
1. The mechanism of the inhibitory effect of caffeine was investigated using vascular smooth muscle of rabbit aorta and intestinal smooth muscle of taenia isolated from guinea-pig caecum. 2. Caffeine, 0.5-10 mM, relaxed the sustained contraction induced by 65.4 mM KCl or 10(-6) M noradrenaline in aorta, and by 45.4 mM KCl or 10(-6) M carbachol in taenia. The inhibitory effect of caffeine on the high K+-induced contraction was antagonized by external Ca2+ but not by the Ca2 channel activators, Bay K 8644 (10(-7) M) or CGP 28,392 (10(-7) M). Forskolin (2 x 10(-7) M) potentiated the inhibitory effect of caffeine on the noradrenaline-induced contraction but not on the high K+- or carbachol-induced contraction. Caffeine induced a time- and concentration-dependent increase in the cyclic AMP content of aorta and forskolin caused a further augmentation. 3. 45Ca2+ uptake was increased by high K+ or noradrenaline in aorta and by high K+ or carbachol in taenia. The increments were inhibited by caffeine at concentrations needed to inhibit muscle contractions. 4. 45Ca2+ in the cellular releasable site in aorta was decreased either by noradrenaline or by caffeine. Simultaneous application of noradrenaline and caffeine did not induce an additive decrease. 5. In aorta treated with a Ca2+-free solution, caffeine induced only a small contraction. Noradrenaline induced a greater contraction which was inhibited by caffeine. After washout of caffeine and noradrenaline, the second application of noradrenaline induced a transient contraction suggesting that caffeine does not deplete the noradrenaline-sensitive store. 6. It was concluded that caffeine has multiple sites of action in smooth muscle. Caffeine releases Ca2+ from a store which is apparently not sensitive to noradrenaline. Caffeine may inhibit noradrenalineinduced Ca2' release. Caffeine itself induces only a small contraction possibly because it decreases the Ca2+ sensitivity of contractile filaments and/or increases Ca2+ extrusion. Further, caffeine seems to inhibit stimulated Ca2+ influx. Cyclic AMP may be only partly responsible for the inhibitory effect of caffeine.
Collapse
MESH Headings
- 3-Pyridinecarboxylic acid, 1,4-dihydro-2,6-dimethyl-5-nitro-4-(2-(trifluoromethyl)phenyl)-, Methyl ester/pharmacology
- Animals
- Caffeine/pharmacology
- Calcium/metabolism
- Calcium Radioisotopes
- Colforsin/pharmacology
- Cyclic AMP/metabolism
- Guinea Pigs
- In Vitro Techniques
- Male
- Muscle Contraction/drug effects
- Muscle, Smooth/drug effects
- Muscle, Smooth/metabolism
- Muscle, Smooth, Vascular/drug effects
- Muscle, Smooth, Vascular/metabolism
- Norepinephrine/pharmacology
- Rabbits
Collapse
Affiliation(s)
- H Y Ahn
- Department of Veterinary Pharmacology, Faculty of Agriculture, University of Tokyo, Japan
| | | | | |
Collapse
|
46
|
Karaki H, Ahn HY, Urakawa N. Caffeine-induced contraction in vascular smooth muscle. Arch Int Pharmacodyn Ther 1987; 285:60-71. [PMID: 3579426] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Characteristics of caffeine-induced contraction were compared with those of high K+- and norepinephrine-induced contractions in order to evaluate the participation of the Ca++-induced Ca++-release (CCR) from storage site in the vascular smooth muscle of rabbit aorta. Caffeine induced a transient contraction in a solution without MgCl2. One mM Mg++ selectively inhibited the caffeine-induced contraction. Two mM procaine inhibited the contractions induced by caffeine, high K+ and norepinephrine. One mM lidocaine and low temperature (23 degrees C) inhibited both high K+- and norepinephrine-induced contractions but rather potentiated the caffeine-induced contraction. Simultaneous addition of 10(-6) M verapamil and 10(-5) M sodium nitroprusside inhibited both high K+- and norepinephrine-induced contractions, but not the caffeine-induced contraction. In a Ca++-free solution, both caffeine and norepinephrine induced transient contractions. Norepinephrine-induced transient contraction was more strongly inhibited than caffeine-induced contraction by 2 mM procaine and 1 mM lidocaine, whereas 5 mM Mg++ inhibited only the caffeine-induced contraction. In sarcoplasmic reticulum of skeletal muscle, it has been shown that the CCR is activated by caffeine and inhibited by procaine, but not by lidocaine and low temperature. Although Mg++ is an inhibitor of CCR, changes in extracellular Mg++ concentrations do not seem to readily modify the intracellular Mg++ concentration in the intact smooth muscle, and the inhibitory effect of Mg++ on caffeine-induced contraction may not be attributable to the direct effect on sarcoplasmic reticulum. These results suggest that the CCR plays an important role in the contraction induced by caffeine but not in the contractions induced by high K+ and norepinephrine in the vascular smooth muscle of rabbit aorta.
Collapse
|
47
|
Karaki H, Ahn HY, Nakagawa H, Urakawa N. Increase in membrane permeability in the absence of Ca and Mg in the smooth muscle of guinea-pig taenia coli. Jpn J Pharmacol 1985; 37:59-65. [PMID: 3990044 DOI: 10.1254/jjp.37.59] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
In Ca-deficient smooth muscle of guinea-pig taenia coli, repeated application of high-K solution (45.4 mM) containing Ca induced contractions of similar shape and magnitude. In muscle treated by a Ca- and Mg-deficient solution, however, addition of Ca and K either did not induce contraction or induced only a delayed contraction. Ouabain (1 X 10(-3) M) also inhibited Ca- and K-induced contraction. Na content of taenia coli smooth muscle increased and K content decreased during incubation in Ca- and Mg-deficient solution. Ouabain produced similar, but smaller, changes in Na and K contents. Contractility of Ca- and Mg-deficient taenia partially recovered if the muscle was treated with Na-deficient solution which resulted in a large decrease in Na content. Similar treatment produced only a small decrease in Na content in ouabain-treated taenia, and contractility did not recover in these muscles. Application of hyperosmotic NaCl (160 mM) decreased tissue weight in both control and ouabain-treated taenia. In muscle treated with Ca- and Mg-deficient solution, however, hyperosmotic NaCl application had little effect on tissue weight. Following pretreatment of muscle with Ca- and Mg-deficient solution (containing 2 mM EDTA) for 2 hr, graded contractions were induced by cumulative application of Ca between 10(-7) to 10(-6) M in the presence of Mg and ATP. It is concluded that Ca- and Mg-deficient solution increases membrane permeability and also abolishes transmembrane gradients of Na and K in guinea pig taenia coli.
Collapse
|
48
|
Ahn HY, Karaki H, Urakawa N. Deficiency of external Ca and Mg increases membrane permeability in the vascular smooth muscle of rabbit aorta. Arch Int Pharmacodyn Ther 1984; 272:236-44. [PMID: 6525006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
Effects of a 60 min incubation in Ca- and/or Mg-deficient solutions on the ion contents in vascular smooth muscle of rabbit aorta were examined. In Mg-deficient solution, resting tone of the muscle did not change. Ca-deficient solution increased, whereas Ca- and Mg-deficient solution decreased the resting tone. Ca-deficient solution increased and Ca- and Mg-deficient solution further increased cellular Na content whereas Ca-deficient solution decreased and Ca- and Mg-deficient solution further decreased the cellular K content. Mg-deficient solution did not change the ion contents. Application of hyperosmotic 160 mM NaCl elicited a contraction and a decrease in wet weight of the tissue in normal and Mg-deficient solutions. In Ca-deficient solution both the contraction and the loss of wet weight were attenuated. In Ca- and Mg-deficient solution, the contraction became smaller and the change in the wet weight was not observed. Loss of tissue Mg in Mg-deficient solution was increased when Ca was removed from the medium. Cellular 45Ca uptake increased after a 60 min treatment of the muscle in Ca-deficient solution and in Ca- and Mg-deficient solution. It is concluded that Ca- and Mg-depletion increases membrane permeability to mono- and divalent cations in rabbit aorta. Although Mg depletion alone does not seem to change the membrane permeability, Mg decreases the membrane permeability in the absence of Ca.
Collapse
|
49
|
Karaki H, Ahn HY, Urakawa N. Hyperosmotic applications of KCl induce vascular smooth muscle contraction which is independent of external Ca. Jpn J Pharmacol 1983; 33:246-8. [PMID: 6876519 DOI: 10.1254/jjp.33.246] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
|