1
|
Kim MJ, Park J, Kang M, Jeong U, Jeong D, Kang NG, Hwang SJ, Youn SH, Hwang BK, Hyun Y, Kim D. Bacteria detection and species identification at the single-cell level using super-resolution fluorescence imaging and AI analysis. Biosens Bioelectron 2023; 240:115603. [PMID: 37647686 DOI: 10.1016/j.bios.2023.115603] [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] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2023] [Accepted: 08/14/2023] [Indexed: 09/01/2023]
Abstract
The skin microbiome is thought to play a critical role in maintaining skin health and protecting against infection. While most microorganisms that live on the skin are harmless or even beneficial, some can cause skin infections or other health problems, emphasizing the importance of diagnosis of the composition and diversity of the skin flora. However, conventional diagnostic methods for evaluation of the skin microbiome are not sensitive enough to detect bacteria at low concentrations and suffer from poor specificity, thus limiting early diagnosis of bacterial infections. In this study, we developed novel approaches for bacterial species detection and identification methods with single-cell sensitivity using super-resolution microscopy and AI-based image analysis: a protein quantification-based method and an AI-based bacterial image analysis method. We demonstrate that these methods can differentiate between common bacterial members of the skin flora, including Staphylococcus aureus and Staphylococcus epidermidis, and different ribotypes of Cutibacterium acnes, both in purified bacterial samples and in scaling skin samples. The advantages of these methods, including the lack of time-consuming amplification or purification steps and single-cell level detection sensitivity, allow early diagnosis of bacterial infections, even from bacterial samples at extremely low concentrations, thus showing promise as a next-generation platform for microbiome detection as single-cell diagnostics.
Collapse
Affiliation(s)
- Min Jeong Kim
- Department of Chemistry, Hanyang University, Seoul, 04763, Republic of Korea
| | - Jinyong Park
- Department of Mathematics, Inha University, Incheon, 22212, Republic of Korea
| | - Minjae Kang
- Department of Chemistry, Hanyang University, Seoul, 04763, Republic of Korea
| | - Uidon Jeong
- Department of Chemistry, Hanyang University, Seoul, 04763, Republic of Korea
| | - Dokyung Jeong
- Department of Chemistry, Hanyang University, Seoul, 04763, Republic of Korea
| | - Nae-Gyu Kang
- R&D Center, LG H&H Co., Ltd., Seoul, 07795, Republic of Korea
| | - Seung Jin Hwang
- R&D Center, LG H&H Co., Ltd., Seoul, 07795, Republic of Korea
| | - Sung Hun Youn
- R&D Center, LG H&H Co., Ltd., Seoul, 07795, Republic of Korea
| | - Bo Kyoung Hwang
- R&D Center, LG H&H Co., Ltd., Seoul, 07795, Republic of Korea
| | - Yoonsuk Hyun
- Department of Mathematics, Inha University, Incheon, 22212, Republic of Korea
| | - Doory Kim
- Department of Chemistry, Hanyang University, Seoul, 04763, Republic of Korea; Research Institute for Convergence of Basic Science, Hanyang University, Seoul, 04763, Republic of Korea; Institute of Nano Science and Technology, Hanyang University, Seoul, 04763, Republic of Korea; Research Institute for Natural Sciences, Hanyang University, Seoul, 04763, Republic of Korea.
| |
Collapse
|
2
|
Kim SK, Lee M, Lee YQ, Lee HJ, Rho M, Kim Y, Seo JY, Youn SH, Hwang SJ, Kang NG, Lee CH, Park SY, Lee DY. Genome-scale metabolic modeling and in silico analysis of opportunistic skin pathogen Cutibacterium acnes. Front Cell Infect Microbiol 2023; 13:1099314. [PMID: 37520435 PMCID: PMC10374032 DOI: 10.3389/fcimb.2023.1099314] [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] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2022] [Accepted: 06/29/2023] [Indexed: 08/01/2023] Open
Abstract
Cutibacterium acnes, one of the most abundant skin microbes found in the sebaceous gland, is known to contribute to the development of acne vulgaris when its strains become imbalanced. The current limitations of acne treatment using antibiotics have caused an urgent need to develop a systematic strategy for selectively targeting C. acnes, which can be achieved by characterizing their cellular behaviors under various skin environments. To this end, we developed a genome-scale metabolic model (GEM) of virulent C. acnes, iCA843, based on the genome information of a relevant strain from ribotype 5 to comprehensively understand the pathogenic traits of C. acnes in the skin environment. We validated the model qualitatively by demonstrating its accuracy prediction of propionate and acetate production patterns, which were consistent with experimental observations. Additionally, we identified unique biosynthetic pathways for short-chain fatty acids in C. acnes compared to other GEMs of acne-inducing skin pathogens. By conducting constraint-based flux analysis under endogenous carbon sources in human skin, we discovered that the Wood-Werkman cycle is highly activated under acnes-associated skin condition for the regeneration of NAD, resulting in enhanced propionate production. Finally, we proposed potential anti-C. acnes targets by using the model-guided systematic framework based on gene essentiality analysis and protein sequence similarity search with abundant skin microbiome taxa.
Collapse
Affiliation(s)
- Su-Kyung Kim
- School of Chemical Engineering, Sungkyunkwan University, Suwon, Gyeonggi-do, Republic of Korea
| | - Minouk Lee
- School of Chemical Engineering, Sungkyunkwan University, Suwon, Gyeonggi-do, Republic of Korea
| | - Yi Qing Lee
- School of Chemical Engineering, Sungkyunkwan University, Suwon, Gyeonggi-do, Republic of Korea
| | - Hyun Jun Lee
- Department of Biomedical Informatics, Hanyang University, Seoul, Republic of Korea
| | - Mina Rho
- Department of Biomedical Informatics, Hanyang University, Seoul, Republic of Korea
- Department of Computer Science, Hanyang University, Seoul, Republic of Korea
| | - Yunkwan Kim
- R&D Center, LG Household & Healthcare (LG H&H), Seoul, Republic of Korea
| | - Jung Yeon Seo
- R&D Center, LG Household & Healthcare (LG H&H), Seoul, Republic of Korea
| | - Sung Hun Youn
- R&D Center, LG Household & Healthcare (LG H&H), Seoul, Republic of Korea
| | - Seung Jin Hwang
- R&D Center, LG Household & Healthcare (LG H&H), Seoul, Republic of Korea
| | - Nae Gyu Kang
- R&D Center, LG Household & Healthcare (LG H&H), Seoul, Republic of Korea
| | - Choong-Hwan Lee
- Department of Bioscience and Biotechnology, Konkuk University, Seoul, Republic of Korea
| | - Seo-Young Park
- School of Chemical Engineering, Sungkyunkwan University, Suwon, Gyeonggi-do, Republic of Korea
| | - Dong-Yup Lee
- School of Chemical Engineering, Sungkyunkwan University, Suwon, Gyeonggi-do, Republic of Korea
| |
Collapse
|
3
|
Jeong D, Kim MJ, Park Y, Chung J, Kweon HS, Kang NG, Hwang SJ, Youn SH, Hwang BK, Kim D. Visualizing extracellular vesicle biogenesis in gram-positive bacteria using super-resolution microscopy. BMC Biol 2022; 20:270. [PMID: 36464676 PMCID: PMC9720944 DOI: 10.1186/s12915-022-01472-3] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [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: 06/16/2022] [Accepted: 11/21/2022] [Indexed: 12/11/2022] Open
Abstract
BACKGROUND Recently, bacterial extracellular vesicles (EVs) have been considered to play crucial roles in various biological processes and have great potential for developing cancer therapeutics and biomedicine. However, studies on bacterial EVs have mainly focused on outer membrane vesicles released from gram-negative bacteria since the outermost peptidoglycan layer in gram-positive bacteria is thought to preclude the release of EVs as a physical barrier. RESULTS Here, we examined the ultrastructural organization of the EV produced by gram-positive bacteria using super-resolution stochastic optical reconstruction microscopy (STORM) at the nanoscale, which has not been resolved using conventional microscopy. Based on the super-resolution images of EVs, we propose three major mechanisms of EV biogenesis, i.e., membrane blebbing (mechanisms 1 and 2) or explosive cell lysis (mechanism 3), which are different from the mechanisms in gram-negative bacteria, despite some similarities. CONCLUSIONS These findings highlight the significant role of cell wall degradation in regulating various mechanisms of EV biogenesis and call for a reassessment of previously unresolved EV biogenesis in gram-positive bacteria.
Collapse
Affiliation(s)
- Dokyung Jeong
- grid.49606.3d0000 0001 1364 9317Department of Chemistry, Hanyang University, Seoul, 04763 Republic of Korea
| | - Min Jeong Kim
- grid.49606.3d0000 0001 1364 9317Department of Chemistry, Hanyang University, Seoul, 04763 Republic of Korea
| | - Yejin Park
- grid.49606.3d0000 0001 1364 9317Department of Chemistry, Hanyang University, Seoul, 04763 Republic of Korea
| | - Jinkyoung Chung
- grid.49606.3d0000 0001 1364 9317Department of Chemistry, Hanyang University, Seoul, 04763 Republic of Korea
| | - Hee-Seok Kweon
- grid.410885.00000 0000 9149 5707Electron Microscopy Research Center, Korea Basic Science Institute, Cheongju, 28119 Republic of Korea
| | - Nae-Gyu Kang
- R&D Center, LG H&H Co., Ltd, Seoul, 07795 Republic of Korea
| | | | - Sung Hun Youn
- R&D Center, LG H&H Co., Ltd, Seoul, 07795 Republic of Korea
| | | | - Doory Kim
- grid.49606.3d0000 0001 1364 9317Department of Chemistry, Hanyang University, Seoul, 04763 Republic of Korea ,grid.49606.3d0000 0001 1364 9317Research Institute for Convergence of Basic Science, Hanyang University, Seoul, 04763 Republic of Korea ,grid.49606.3d0000 0001 1364 9317Institute of Nano Science and Technology, Hanyang University, Seoul, 04763 Republic of Korea ,grid.49606.3d0000 0001 1364 9317Research Institute for Natural Sciences, Hanyang University, Seoul, 04763 Republic of Korea
| |
Collapse
|
4
|
Hwang BK, Lee S, Myoung J, Hwang SJ, Lim JM, Jeong ET, Park SG, Youn SH. Effect of the skincare product on facial skin microbial structure and biophysical parameters: A pilot study. Microbiologyopen 2021; 10:e1236. [PMID: 34713611 PMCID: PMC8494714 DOI: 10.1002/mbo3.1236] [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] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2021] [Accepted: 09/08/2021] [Indexed: 11/23/2022] Open
Abstract
Daily use of cosmetics is known to affect the skin microbiome. This study aimed to determine the bacterial community structure and skin biophysical parameters following the daily application of a skincare product on the face. Twenty-five Korean women, who used the same skincare product for four weeks participated in the study. During this period, skin hydration, texture, sebum content, and pH were measured, and skin swab samples were collected on the cheeks. The microbiota was analyzed using the MiSeq system. Through these experiments, bacterial diversity in facial skin increased and the microbial community changed after four weeks of skincare product application. The relative abundance of Cutibacterium and Staphylococcus increased, significant changes in specific bacterial modules of the skin microbial network were observed, and skin hydration and texture improved. It was suggested that daily use of skincare products could affect the microbial structure of facial skin as well as the biophysical properties of the facial skin. These findings expand our understanding of the role of skincare products on the skin environment.
Collapse
Affiliation(s)
| | - Sado Lee
- R&D CenterLG Household and Health Care LtdSeoulSouth Korea
| | - Joonoh Myoung
- R&D CenterLG Household and Health Care LtdSeoulSouth Korea
| | | | - Jun Man Lim
- R&D CenterLG Household and Health Care LtdSeoulSouth Korea
| | - Eui Taek Jeong
- R&D CenterLG Household and Health Care LtdSeoulSouth Korea
| | - Sun Gyoo Park
- R&D CenterLG Household and Health Care LtdSeoulSouth Korea
| | - Sung Hun Youn
- R&D CenterLG Household and Health Care LtdSeoulSouth Korea
| |
Collapse
|
5
|
Kim M, Kim KY, Lee KM, Youn SH, Lee SM, Woo HM, Oh MK, Um Y. Butyric acid production from softwood hydrolysate by acetate-consuming Clostridium sp. S1 with high butyric acid yield and selectivity. Bioresour Technol 2016; 218:1208-1214. [PMID: 27474955 DOI: 10.1016/j.biortech.2016.07.073] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [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: 06/02/2016] [Revised: 07/18/2016] [Accepted: 07/19/2016] [Indexed: 06/06/2023]
Abstract
The aim of this work was to study the butyric acid production from softwood hydrolysate by acetate-consuming Clostridium sp. S1. Results showed that Clostridium sp. S1 produced butyric acid by simultaneously utilizing glucose and mannose in softwood hydrolysate and, more remarkably, it consumed acetic acid in hydrolysate. Clostridium sp. S1 utilized each of glucose, mannose, and xylose as well as mixed sugars simultaneously with partially repressed xylose utilization. When softwood (Japanese larch) hydrolysate containing glucose and mannose as the main sugars was used, Clostridium sp. S1 produced 21.17g/L butyric acid with the yield of 0.47g/g sugar and the selectivity of 1 (g butyric acid/g total acids) owing to the consumption of acetic acid in hydrolysate. The results demonstrate potential of Clostridium sp. S1 to produce butyric acid selectively and effectively from hydrolysate not only by utilizing mixed sugars simultaneously but also by converting acetic acid to butyric acid.
Collapse
Affiliation(s)
- Minsun Kim
- Clean Energy Research Center, Korea Institute of Science and Technology (KIST), Seoul, Republic of Korea; Department of Chemical and Biological Engineering, Korea University, Seoul, Republic of Korea
| | - Ki-Yeon Kim
- Clean Energy Research Center, Korea Institute of Science and Technology (KIST), Seoul, Republic of Korea; Clean Energy and Chemical Engineering, Korea University of Science and Technology, Daejeon, Republic of Korea
| | - Kyung Min Lee
- Clean Energy Research Center, Korea Institute of Science and Technology (KIST), Seoul, Republic of Korea
| | - Sung Hun Youn
- Clean Energy Research Center, Korea Institute of Science and Technology (KIST), Seoul, Republic of Korea
| | - Sun-Mi Lee
- Clean Energy Research Center, Korea Institute of Science and Technology (KIST), Seoul, Republic of Korea; Clean Energy and Chemical Engineering, Korea University of Science and Technology, Daejeon, Republic of Korea
| | - Han Min Woo
- Clean Energy Research Center, Korea Institute of Science and Technology (KIST), Seoul, Republic of Korea; Clean Energy and Chemical Engineering, Korea University of Science and Technology, Daejeon, Republic of Korea
| | - Min-Kyu Oh
- Department of Chemical and Biological Engineering, Korea University, Seoul, Republic of Korea
| | - Youngsoon Um
- Clean Energy Research Center, Korea Institute of Science and Technology (KIST), Seoul, Republic of Korea; Clean Energy and Chemical Engineering, Korea University of Science and Technology, Daejeon, Republic of Korea.
| |
Collapse
|
6
|
Youn SH, Lee KM, Kim KY, Lee SM, Woo HM, Um Y. Effective isopropanol-butanol (IB) fermentation with high butanol content using a newly isolated Clostridium sp. A1424. Biotechnol Biofuels 2016; 9:230. [PMID: 27800016 PMCID: PMC5080687 DOI: 10.1186/s13068-016-0650-7] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/12/2016] [Accepted: 10/18/2016] [Indexed: 05/17/2023]
Abstract
BACKGROUND Acetone-butanol-ethanol fermentation has been studied for butanol production. Alternatively, to achieve acetone-free butanol production, use of clostridium strains producing butanol and 1,3-propanediol (1,3-PDO) from glycerol, natural and engineered isopropanol-butanol-ethanol (IBE) producers has been attempted; however, residual 1,3-PDO and acetone, low IBE production by natural IBE producers, and complicated gene modification are limitations. RESULTS Here, we report an effective isopropanol and butanol (IB) fermentation using a newly isolated Clostridium sp. A1424 capable of producing IB from various substrates with a small residual acetone. Notably, this strain also utilized glycerol and produced butanol and 1,3-PDO. After 46.35 g/L of glucose consumption at pH 5.5-controlled batch fermentation, Clostridium sp. A1424 produced 9.43 g/L of butanol and 13.92 g/L of IB at the productivity of 0.29 and 0.44 g/L/h, respectively, which are the highest values in glucose-based batch fermentations using natural IB producers. More interestingly, using glucose-glycerol mixtures at ratios ranging from 20:2 to 14:8 led to not only acetone-free and 1,3-PDO-free IB fermentation but also enhanced IB production along with a much higher butanol content (butanol/isopropanol ratio of 1.81 with glucose vs. 2.07-6.14 with glucose-glycerol mixture). Furthermore, when the mixture of glucose and crude glycerol at the ratio of 14:8 (total concentration of 35.68 g/L) was used, high butanol/isopropanol ratio (3.44) and butanol titer (9.86 g/L) were achieved with 1.4-fold enhanced butanol yield (0.28 g/g) and productivity (0.41 g/L/h) compared to those with glucose only at pH 5.5. CONCLUSIONS A newly isolated Clostridium sp. A1424 was able to produce butanol and isopropanol from various carbon sources. The productivity and titer of butanol and total alcohol obtained in this study were higher than the previously reported results obtained using other natural IB producers. Use of the mixture of glucose and glycerol was successful to achieve acetone-free, 1,3-PDO-free, and enhanced IB production with higher yield, productivity, and selectivity of butanol compared to those with glucose only, providing great advantages from the perspective of carbon recovery to alcohols. This notable result could be accomplished by isolating an effective IB producer Clostridium sp. A1424 as well as by utilizing glucose-glycerol mixtures.
Collapse
Affiliation(s)
- Sung Hun Youn
- Clean Energy Research Center, Korea Institute of Science and Technology (KIST), Hwarangno 14‑gil 5, Seongbuk‑gu, Seoul, 02792 South Korea
| | - Kyung Min Lee
- Clean Energy Research Center, Korea Institute of Science and Technology (KIST), Hwarangno 14‑gil 5, Seongbuk‑gu, Seoul, 02792 South Korea
| | - Ki-Yeon Kim
- Clean Energy Research Center, Korea Institute of Science and Technology (KIST), Hwarangno 14‑gil 5, Seongbuk‑gu, Seoul, 02792 South Korea
| | - Sun-Mi Lee
- Clean Energy Research Center, Korea Institute of Science and Technology (KIST), Hwarangno 14‑gil 5, Seongbuk‑gu, Seoul, 02792 South Korea
- Clean Energy and Chemical Engineering, Korea University of Science and Technology, 217 Gajeong‑ro, Yuseong‑gu, Daejeon, 34113 South Korea
| | - Han Min Woo
- Department of Food Science and Biotechnology, Sungkyunkwan University (SKKU), 2066 Seobu-ro, Jangan-gu, Suwon, 16419 South Korea
| | - Youngsoon Um
- Clean Energy Research Center, Korea Institute of Science and Technology (KIST), Hwarangno 14‑gil 5, Seongbuk‑gu, Seoul, 02792 South Korea
- Clean Energy and Chemical Engineering, Korea University of Science and Technology, 217 Gajeong‑ro, Yuseong‑gu, Daejeon, 34113 South Korea
| |
Collapse
|
7
|
Youn SH, Park HW, Choe D, Shin CS. Preparation of eutectic substrate mixtures for enzymatic conversion of ATC to l-cysteine at high concentration levels. Bioprocess Biosyst Eng 2013; 37:1193-200. [DOI: 10.1007/s00449-013-1090-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2013] [Accepted: 11/03/2013] [Indexed: 11/30/2022]
|
8
|
Youn SH, Park HW, Shin CS. Enhanced dissolution of the substrate d,l-2-amino-Δ2-thiazoline-4-carboxylic acid and enzymatic production of l-cysteine at high concentrations. Eng Life Sci 2012. [DOI: 10.1002/elsc.201200002] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
|
9
|
Park HW, Kim YO, Ha JS, Youn SH, Kim HH, Bilgrami AL, Shin CS. Effects of associated bacteria on the pathogenicity and reproduction of the insect-parasitic nematode Rhabditis blumi (Nematoda: Rhabditida). Can J Microbiol 2011; 57:750-8. [PMID: 21867444 DOI: 10.1139/w11-067] [Citation(s) in RCA: 24] [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: 11/22/2022]
Abstract
Three bacteria, Alcaligenes faecalis , Flavobacterium sp., and Providencia vermicola , were isolated from dauer juveniles of Rhabditis blumi . The pathogenic effects of the bacteria against 4th instar larvae of Galleria mellonella were investigated. Providencia vermicola and Flavobacterium sp. showed 100% mortality at 48 h after haemocoelic injection, whereas A. faecalis showed less than 30% mortality. Dauer juveniles showed 100% mortality against G. mellonella larvae, whereas axenic juveniles, which do not harbor associated bacteria, exhibited little mortality. All of the associated bacteria were used as a food source for nematode growth, and nematode yield differed with bacterial species. Among the bacterial species, P. vermicola was most valued for nematode yield, showing the highest yield of 5.2 × 10(4) nematodes/mL in the plate. In bacterial cocultures using two of the three associated bacteria, one kind stimulated the other. The highest total bacterial yield of 12.6 g/L was obtained when the inoculum ratio of P. vermicola to A. faecalis was 10:1. In air-lift bioreactors, the nematode growth rate increased with an increasing level of dissolved oxygen. The maximum nematode yield of 1.75 × 10(5) nematodes/mL was obtained at 192 h with an aeration rate of 6 vvm.
Collapse
Affiliation(s)
- Hae Woong Park
- Department of Biotechnology, College of Life Science and Biotechnology, Yonsei University, Shinchon-dong, Seodaemun-gu, Seoul 120-749, South Korea
| | | | | | | | | | | | | |
Collapse
|
10
|
Huisman SR, Jain N, Babichev SA, Vewinger F, Zhang AN, Youn SH, Lvovsky AI. Instant single-photon Fock state tomography. Opt Lett 2009; 34:2739-2741. [PMID: 19756089 DOI: 10.1364/ol.34.002739] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Heralded single photons are prepared at a rate of approximately 100 kHz via conditional measurements on polarization-nondegenerate biphotons produced in a periodically poled potassium-titanyl phosphate crystal. The single-photon Fock state is characterized using high-frequency pulsed optical homodyne tomography with a fidelity of (57.6+/-0.1)%. The state preparation and detection rates allowed us to perform on-the-fly alignment of the apparatus based on real-time analysis of the quadrature measurement statistics.
Collapse
Affiliation(s)
- S R Huisman
- Institute for Quantum Information Science, University of Calgary, Calgary, Alberta T2N 1N4, Canada
| | | | | | | | | | | | | |
Collapse
|
11
|
Abstract
The mechanism of eutectic formation was investigated via computer-aided molecular dynamics techniques based on experimental results. The CBZ group mixtures CBZ-l-Asp/d-AlaNH2 x HCl/methanol, CBZ-l-Asp/l-PheOMe x HCl/methanol, and CBZ-l-Tyr/l-ArgNH2 x 2HCl/methanol formed transparent eutectic melts. The non-CBZ group mixtures l-Asp/d-AlaNH2 x HCl/methanol, l-Asp/l-PheOMe x HCl/methanol, and l-Tyr/l-ArgNH2 x 2HCl/methanol did not form eutectic melts. According to molecular dynamics simulation results, increase in the kinetic energy values of eutectic forming mixtures was much larger than the increase in potential energy over a temperature shift from 298 to 333 K. However, the results for non-eutectic forming mixtures were reversed. The Coulomb interaction energies of eutectic forming mixtures significantly decreased, because eutectic melting can increase the mobility of molecules in the mixtures. The enhancement of molecular mobility was confirmed by increased self-diffusion constant values, and the change of solid-to-liquid phase was detected by radial distribution function results. The periodic boundary conditions for calculation of molecular dynamics were found to be reliable.
Collapse
Affiliation(s)
- Hyun Jung Kim
- Department of Biotechnology, College of Engineering, Yonsei University, 134 Shinchon-dong, Seodaemun-gu, Seoul 120-749, South Korea
| | | | | | | |
Collapse
|
12
|
Youn SH, Yang ZX, Hwang KH, Seo DS, Lee JK, Jun BS, Kim H. Effect of glass phase on the dissolution of hydroxyapatite. J Nanosci Nanotechnol 2008; 8:679-684. [PMID: 18464391 DOI: 10.1166/jnn.2008.d246] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Nano size defect formation at grain boundary during the dissolution of hydroxyapatite in water was evaluated by adding several sintering additives for sinterability enhancement. In the case of sintered pure hydroxyapatite, significant dissolution occurred after immersion in distilled water or in simulated body fluid. The dissolution initiated at the grain boundaries creating nano-size defects like small pores that afterwards grew up to micro scale by increasing immersion time. This dissolution resulted in grain separation at the surfaces and finally in fracture. The dissolution concentrated on the grains adjacent to pores rather than those in the dense region. So hydroxyapatite ceramics containing glass powders were prepared to prevent the dissolution by strengthening grain boundary. Calcium silicate and phosphate glasses were added at 0 to 10 mass% and sintered at 1200 degrees C for 2 h in air with moisture protection. Glass phase was incorporated into hydroxyapatite to act as the sintering aid followed by crystallization in order to improve the mechanical properties without reducing biocompatibility. Dissolution tests, as well as X-ray diffraction and SEM showed little decomposition of hydroxyapatite to secondary phases and the fracture toughness increased compared to pure hydroxyapatite.
Collapse
Affiliation(s)
- S H Youn
- Eng. Res. Inst., i-Cube Center, GyeongSang Nat'l Univ., Jinju City, South Korea
| | | | | | | | | | | | | |
Collapse
|
13
|
Lee S, Kim JY, Youn SH, Park M, Hong KS, Jung HS, Lee JK, Shin H. Preparation of a nanoporous CaCO3-coated TiO2 electrode and its application to a dye-sensitized solar cell. Langmuir 2007; 23:11907-11910. [PMID: 17927224 DOI: 10.1021/la701826v] [Citation(s) in RCA: 17] [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: 05/25/2023]
Abstract
A nanoporous CaCO3 overlayer-coated TiO2 thick film was prepared by the topotactic thermal decomposition of Ca(OH)2, and its performance as an electrode of a dye-sensitized solar cell was investigated. As compared to bare TiO2, nanoporous CaCO3-coated TiO2 provided higher specific surface area and, subsequently, a larger amount of dye adsorption; this in turn increased short-circuit current (Jsc). Furthermore, the CaCO3 coating demonstrated increased impedance at the TiO2/dye/electrolyte interface and increased the lifetime of the photoelectrons, indicating the improved retardation of the back electron transfer, which increases Jsc, open-circuit voltage (Voc), and fill factor (ff). Thereby, the energy conversion efficiency (eta) of the solar cell improved from 7.8 to 9.7% (an improvement of 24.4%) as the nanoporous CaCO3 layer was coated onto TiO2 thick films.
Collapse
Affiliation(s)
- Sangwook Lee
- School of Materials Science and Engineering, Seoul National University, San 56-1, Shillim-dong, Kwanak-gu, Seoul 151-744, South Korea
| | | | | | | | | | | | | | | |
Collapse
|
14
|
Kim JH, Kim HJ, Park HW, Youn SH, Choi DY, Shin CS. Development of inhibitors against lipase and α-glucosidase from derivatives of monascus pigment. FEMS Microbiol Lett 2007; 276:93-8. [DOI: 10.1111/j.1574-6968.2007.00917.x] [Citation(s) in RCA: 74] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
|
15
|
Youn SH, Kim HJ, Kim TH, Shin CS. Lipase-catalyzed acylation of naringin with palmitic acid in highly concentrated homogeneous solutions. ACTA ACUST UNITED AC 2007. [DOI: 10.1016/j.molcatb.2007.02.002] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
16
|
Kim HJ, Youn SH, Shin CS. Lipase-catalyzed synthesis of sorbitol-fatty acid esters at extremely high substrate concentrations. J Biotechnol 2005; 123:174-84. [PMID: 16356573 DOI: 10.1016/j.jbiotec.2005.11.006] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2005] [Revised: 11/04/2005] [Accepted: 11/09/2005] [Indexed: 11/17/2022]
Abstract
Lipase-catalyzed synthesis of sorbitol-fatty acid esters was performed in eutectic media with extremely high substrate concentrations. Homogeneous eutectic melts of sorbitol and fatty acids of C6-C16 were prepared using an adjuvant mixture. Enhanced homogeneity of mixtures was confirmed by X-ray diffraction analysis. The substrate concentration was 3.63-6.67 M in the eutectic media, whereas in organic media the concentration was below 0.10 M. Esters were synthesized with an immobilized Candida antarctica lipase, and optimum conditions were analyzed. Compared to reactions in organic media, the initial reaction rate of ester synthesis and the overall productivity were significantly enhanced in eutectic media while the conversion yields were similar. Based on the kinetic analysis, highly viscous eutectic media were shown to influence the initial reaction rate and the apparent activation energy resulting in diffusion limitations.
Collapse
Affiliation(s)
- Hyun Jung Kim
- Department of Biotechnology, College of Engineering, Yonsei University, 134 Shinchon-dong, Seodaemun-gu, Seoul 120-749, South Korea
| | | | | |
Collapse
|
17
|
Wakisaka S, Atsumi Y, Youn SH, Maeda T. Morphological and cytochemical characteristics of periodontal Ruffini ending under normal and regeneration processes. Arch Histol Cytol 2000; 63:91-113. [PMID: 10885447 DOI: 10.1679/aohc.63.91] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Current knowledge on the Ruffini endings, primary mechanoreceptors in the periodontal ligament is reviewed with special reference to their cytochemical features and regeneration process. Morphologically, they are characterized by extensive ramifications of expanded axonal terminals and an association with specialized Schwann cells, called lamellar or terminal Schwann cells, which are categorized, based on their histochemical properties, as non-myelin-forming Schwann cells. Following nerve injury, the periodontal Ruffini endings of the rat incisor ligament can regenerate more rapidly than Ruffini endings in other tissues. During regeneration, terminal Schwann cells associated with the periodontal Ruffini endings migrate into regions where they are never found under normal conditions. Also during regeneration, alterations in the expression level of various bioactive substances occur in both axonal and Schwann cell elements in the periodontal Ruffini endings. Neuropeptide Y, which is not detected in intact periodontal Ruffini endings, is transiently expressed in their regenerating axons. Growth-associated protein-43 (GAP-43) is expressed transiently in both axonal and Schwann cell elements during regeneration, while this protein is localized in the Schwann sheath of periodontal Ruffini endings under normal conditions. The expression of calbindin D28k and calretinin, both belonging to the buffering type of calcium-binding proteins, was delayed in periodontal Ruffini endings, compared to their morphological regeneration. As the importance of axon-Schwann cell interactions has been proposed, further investigations are needed to elucidate their molecular mechanism particularly the contribution of growth factors during the regeneration as well as development of the periodontal Ruffini endings.
Collapse
Affiliation(s)
- S Wakisaka
- Department of Oral Anatomy and Developmental Biology, Osaka University Faculty of Dentistry, Suita, Japan.
| | | | | | | |
Collapse
|
18
|
Maeda T, Ochi K, Nakakura-Ohshima K, Youn SH, Wakisaka S. The Ruffini ending as the primary mechanoreceptor in the periodontal ligament: its morphology, cytochemical features, regeneration, and development. Crit Rev Oral Biol Med 2000; 10:307-27. [PMID: 10759411 DOI: 10.1177/10454411990100030401] [Citation(s) in RCA: 80] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The periodontal ligament receives a rich sensory nerve supply and contains many nociceptors and mechanoreceptors. Although its various kinds of mechanoreceptors have been reported in the past, only recently have studies revealed that the Ruffini endings--categorized as low-threshold, slowly adapting, type II mechanoreceptors--are the primary mechanoreceptors in the periodontal ligament. The periodontal Ruffini endings display dendritic ramifications with expanded terminal buttons and, furthermore, are ultrastructurally characterized by expanded axon terminals filled with many mitochondria and by an association with terminal or lamellar Schwann cells. The axon terminals of the periodontal Ruffini endings have finger-like projections called axonal spines or microspikes, which extend into the surrounding tissue to detect the deformation of collagen fibers. The functional basis of the periodontal Ruffini endings has been analyzed by histochemical techniques. Histochemically, the axon terminals are reactive for cytochrome oxidase activity, and the terminal Schwann cells have both non-specific cholinesterase and acid phosphatase activity. On the other hand, many investigations have suggested that the Ruffini endings have a high potential for neuroplasticity. For example, immunoreactivity for p75-NGFR (low-affinity nerve growth factor receptor) and GAP-43 (growth-associated protein-43), both of which play important roles in nerve regeneration/development processes, have been reported in the periodontal Ruffini endings, even in adult animals (though these proteins are usually repressed or down-regulated in mature neurons). Furthermore, in experimental studies on nerve injury to the inferior alveolar nerve, the degeneration of Ruffini endings takes place immediately after nerve injury, with regeneration beginning from 3 to 5 days later, and the distribution and terminal morphology returning to almost normal at around 14 days. During regeneration, some regenerating Ruffini endings expressed neuropeptide Y, which is rarely observed in normal animals. On the other hand, the periodontal Ruffini endings show stage-specific configurations which are closely related to tooth eruption and the addition of occlusal forces to the tooth during postnatal development, suggesting that mechanical stimuli due to tooth eruption and occlusion are a prerequisite for the differentiation and maturation of the periodontal Ruffini endings. Further investigations are needed to clarify the involvement of growth factors in the molecular mechanisms of the development and regeneration processes of the Ruffini endings.
Collapse
Affiliation(s)
- T Maeda
- Department of Oral Anatomy, Niigata University School of Dentistry, Japan
| | | | | | | | | |
Collapse
|
19
|
Youn SH, Maeda T, Kurisu K, Wakisaka S. Alteration in the expression level of calbindin D28k in the periodontal ligament of the rat molar during experimental tooth movement. Arch Histol Cytol 1999; 62:139-47. [PMID: 10399538 DOI: 10.1679/aohc.62.139] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
The present immunohistochemical study was designed to investigate changes in the distribution and expression level of calbindin D28k in the periodontal ligament during experimental tooth movement in the rat molar to clarify the physiological role of this protein in the ligament. In normal animals, calbindin D28k-like immunoreactivity appeared sparsely in spindle-shaped cells in the alveolar half of the periodontal ligament. Electron microscopic observations showed that these immunoreactive cells were characterized by well-developed rough-surfaced endoplasmic reticulum and phagosomes--which often contained collagen fibers--suggesting that these cells could be categorized as periodontal fibroblasts. Twelve hours following the onset of the experimental tooth movement, cells positive for calbindin D28k increased in number in the periodontal ligament, especially in the alveolar half of the pressured side. Immunoelectron microscopy showed that the calbindin D28k-immunopositive cells had morphological features similar to those of fibroblasts in the normal ligament, and that these cells occasionally made contact with immunonegative macrophage-like cells. Immunopositive cells gradually decreased in number, and the distribution of the cells and intensity of the immunoreactivity returned to normal levels by 14 days following the induction of the experimental tooth movement. The present results suggest that calbindin D28k plays an important role in the homeostasis and cyto-protection of fibroblasts in the periodontal ligament at the initial phase of experimental tooth movement.
Collapse
Affiliation(s)
- S H Youn
- Department of Oral Anatomy and Developmental Biology, Osaka University Faculty of Dentistry, Japan
| | | | | | | |
Collapse
|
20
|
Wakisaka S, Daikoku H, Miyawaki Y, Youn SH, Maeda T, Kurisu K. Immunohistochemical observation of growth-associated protein 43 (GAP-43) in the developing circumvallate papilla of the rat. Cell Tissue Res 1998; 293:499-507. [PMID: 9716740 DOI: 10.1007/s004410051142] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [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: 11/30/2022]
Abstract
The distribution and development of growth-associated protein 43 (GAP-43)-like immunoreactivity (-LI) in the rat circumvallate papilla (CVP) were compared to those of protein gene product 9.5 (PGP 9.5)-LI. In the adult, thick GAP-43-like immunoreactive (-IR) structures gathered densely in the subgemmal region. Some of these further penetrated the apical epithelium and trench wall epithelium. At least two types of GAP-43-IR structures were recognized; taste bud-related and non-gustatory GAP-43-IR neural elements. Immunoelectron microscopy revealed that GAP-43-LI was localized predominantly in the Schwann cells, and a few axons displayed GAP-43-LI in the lamina propria. In the trench epithelium, GAP-43-LI was detected in the cytoplasmic side of the axonal membrane. Some intragemmal GAP-43-IR axons made synaptic-like contacts with taste bud cells. At least four developmental stages were defined on the basis of the changes in distribution of GAP-43-LI. In stage I [embryonic day (E) 16-17] GAP-43-IR structures accumulated at the lamina propria just beneath the newly-formed circumvallate papilla. In stage II (E18-19) GAP-43-IR nerve fibers began to penetrate the apical epithelium. In stage III [E20-postnatal day (P) 0] GAP-43-IR nerve fibers first appeared in the trench wall epithelium. Penetration of GAP-IR nerve fibers occurred in the inner trench wall epithelium first, and then in the outer trench wall epithelium. In stage IV (P1-) the distribution of GAP-43-LI was similar to that observed in the adult; but the density of GAP-43-LI was much higher than in adults. PGP 9.5-LI showed a similar distribution pattern to that of GAP-43-LI, except for round-shaped cells in the apical epithelium at the late embryonic stages, and in taste bud cells and intralingual ganglionic cells which lacked GAP-43-LI. The similarities in distribution patterns of GAP-43-LI and PGP 9.5-LI during the development and mature circumvallate papilla suggest that GAP-43 may be a key neuronal molecule for induction and maintenance of the taste buds.
Collapse
Affiliation(s)
- S Wakisaka
- Department of Oral Anatomy and Developmental Biology, Osaka University Faculty of Dentistry, 1-8, Yamadaoka, Suita, Osaka 565-0871, Japan.
| | | | | | | | | | | |
Collapse
|
21
|
Youn SH, Maeda T, Kurisu K, Wakisaka S. Growth-associated protein-43 (GAP-43) in the regenerating periodontal Ruffini endings of the rat incisor following injury to the inferior alveolar nerve. Brain Res 1998; 787:41-8. [PMID: 9518545 DOI: 10.1016/s0006-8993(97)01450-9] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.8] [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: 02/06/2023]
Abstract
Alterations in the levels of growth-associated protein 43 (GAP-43)-like immunoreactivity (-LI) were examined in the lingual periodontal ligament of the rat incisor following two types of injury (resection and crush) to the inferior alveolar nerve (IAN). In normal animals, GAP-43-like immunoreactive (IR) structures were observed as tree-like ramifications in the alveolar half of the lingual periodontal ligament of incisors. Under immunoelectron microscopy, GAP-43-LI appeared in the Schwann sheaths associated with periodontal Ruffini endings; neither cell bodies of the terminal Schwann cells nor axonal profiles showed GAP-43-LI. During regeneration of the periodontal Ruffini endings following resection of the IAN, GAP-43-LI appeared in the cytoplasm of the terminal Schwann cell bodies and axoplasm of the terminals. The distribution of GAP-43-LI in the Ruffini endings returned to almost normal levels on days 28 and 56 following the injury. The changes in the distribution of GAP-43-LI following the crush injury were similar to those following resection; however, expression of GAP-43-LI was slightly higher for the entire experimental period compared with the resection. The transient expression of GAP-43 in the terminal Schwann cells and axonal profiles of the periodontal Ruffini endings following nerve injury suggests that GAP-43 is closely associated with axon-Schwann cells interactions during regeneration.
Collapse
Affiliation(s)
- S H Youn
- Department of Oral Anatomy and Developmental Biology, Osaka University Faculty of Dentistry, Suita, Osaka 565, Japan
| | | | | | | |
Collapse
|
22
|
Ochi K, Wakisaka S, Youn SH, Hanada K, Maeda T. Carbonic anhydrase isozyme II immunoreactivity in the mechanoreceptive Ruffini endings of the periodontal ligament in rat incisor. Brain Res 1998; 779:276-9. [PMID: 9473693 DOI: 10.1016/s0006-8993(97)01085-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [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: 02/06/2023]
Abstract
The present study describes the distribution of carbonic anhydrase isozyme II (CA II) in the lingual periodontal ligament of the rat incisor. Some thick nerve fibers in the nerve bundle displayed CA II-like immunoreactivity (LI) as well as non-neuronal elements such as osteoclasts. At the alveolar half of the lingual periodontal ligament of the incisor, thick CA II-like immunoreactive (-IR) nerve fibers showed a tree-like raminification, but thin and beaded CA II-IR nerve fibers were rare. Under the electron microscope, CA II-LI were diffusely localized in the axoplasm of the axon terminals surrounded by Schwann sheaths which were immunonegative for CA II. The cell bodies of the terminal Schwann cells associated with the periodontal Ruffini endings did not exhibit CA II-LI. The present immunohistochemical evidence indicates that CA II may participate in the regulation of the intra-neuronal ion in the periodontal Ruffini endings which are thought to be in a state of high neuronal activity.
Collapse
Affiliation(s)
- K Ochi
- Department of Oral Anatomy, Niigata University School of Dentistry, Japan.
| | | | | | | | | |
Collapse
|
23
|
Ochi K, Hanada K, Youn SH, Wakisaka S, Maeda T. Immunocytochemical demonstration of beta 1-subunit of Na+/K(+)-ATPase in the mechanoreceptive Ruffini-like endings of the rat incisor ligament. Arch Oral Biol 1997; 42:779-82. [PMID: 9447268 DOI: 10.1016/s0003-9969(97)00097-6] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [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: 02/05/2023]
Abstract
The localization of one of the isoforms of Na+/K(+)-ATPase, the beta 1-subunit, was investigated in the periodontal Ruffini endings of rat incisors by light- and electron-microscopic immunocytochemistry. Immunoreactivity for the rat beta 1-subunit followed the pattern of dendritic terminal arborization in the alveolar half of the lingual periodontal ligament. Ultrastructurally, the reaction products were localized in dilatations of axons, possibly the terminals of Ruffini-like endings in the periodontal ligament. No immunoreactivity was seen in Schwann cells. The immunostaining results support the view that the beta 1-subunit of Na+/K(+)-ATPase is the predominant isoform in sensory neurones, and that this protein is a useful marker for periodontal Ruffini-like endings.
Collapse
Affiliation(s)
- K Ochi
- Department of Oral Anatomy, Niigata University School of Dentistry, Japan
| | | | | | | | | |
Collapse
|
24
|
Abstract
Immunoelectron-microscopy was applied to reveal the existence of nerve fibres and terminals showing calbindin D28k (CB)-like immunoreactivity (IR) in the rat molar tooth pulp. In the root pulp, thick, smooth-surfaced CB-IR nerve fibres were in bundles accompanying the blood vessels. In the coronal pulp, the fibres arborized repeatedly and extensively. CB-IR nerve fibres had a predominantly thick, smooth-surfaced appearance, though parts appeared thin and beaded. Occasionally some thin, varicose CB-IR nerve fibres ran along the odontoblasts, penetrating into the predentine alongside the dentinal tubules. They could be traced for approx. 10-20 microns into the predentine from the pulp-predentine border. Immunoelectron-microscopy revealed that only some of the nerve terminals in the predentine showed CB-IR, and that predentinal CB-IR nerve terminals were located close to the odontoblast processes. No synaptic structures were observed between them. The presence of CB-IR nerve terminals in the predentine suggests that many, if not all, CB-IR nerve fibres could be nociceptors. The CB could be involved in Ca2+ homeostasis during the activation of nociceptors.
Collapse
Affiliation(s)
- Y Miyawaki
- Department of Oral Anatomy and Developmental Biology, Osaka University Faculty of Dentistry, Japan
| | | | | | | | | | | |
Collapse
|
25
|
Ochi K, Wakisaka S, Youn SH, Hanada K, Maeda T. Calretinin-like immunoreactivity in the Ruffini endings, slowly adapting mechanoreceptors, of the periodontal ligament of the rat incisor. Brain Res 1997; 769:183-7. [PMID: 9374289 DOI: 10.1016/s0006-8993(97)00847-0] [Citation(s) in RCA: 16] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
The distribution and ultrastructural localization of calretinin (CR)-like immunoreactivity (-LI) were investigated in the lingual periodontal ligament of rat incisors. Some thick nerve fibers within the nerve bundle displayed CR-LI; these CR-like immunoreactive (-IR) nerve fibers entered the alveolar half of the lingual periodontal ligament of the incisor where dendritic terminal arborization was exhibited. Thin and beaded CR-IR nerve fibers were rarely observed in the periodontal ligament. Observations of adjacent sections immunostained with protein gene-product 9.5 (PGP 9.5) revealed that most, if not all, PGP 9.5-IR nerve terminals showing a dendritic arborization expressed CR-LI. Immunoelectron microscopic observations showed that electron-opaque immunoreaction products were localized in the axoplasm of the axon terminals, except for the mitochondria, which were surrounded by Schwann sheaths and multiple-layered basal lamina. Neither cell bodies, the cytoplasmic extension of terminal Schwann cells, nor other cellular elements such as periodontal fibroblasts exhibited CR-LI. The present findings suggest that Ruffini endings, an essential mechanoreceptor in the periodontal ligament and categorized as a slowly adapting mechanoreceptor, express CR-LI, and that CR may participate in the Ca2+ homeostasis against external stimuli in the periodontal Ruffini endings.
Collapse
Affiliation(s)
- K Ochi
- Department of Oral Anatomy, Niigata University School of Dentistry, Japan.
| | | | | | | | | |
Collapse
|
26
|
Chung JH, Youn SH, Kwon OS, Cho KH, Youn JI, Eun HC. Regulations of collagen synthesis by ascorbic acid, transforming growth factor-beta and interferon-gamma in human dermal fibroblasts cultured in three-dimensional collagen gel are photoaging- and aging-independent. J Dermatol Sci 1997; 15:188-200. [PMID: 9302647 DOI: 10.1016/s0923-1811(97)00607-5] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.2] [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: 02/05/2023]
Abstract
Decreased collagen synthesis and loss of responsiveness to growth factors are well known phenomena in in vivo or in vitro aged cells. Ascorbic acid and some cytokines such as transforming growth factor-beta and interferon-gamma are important regulators of collagen synthesis. To investigate the responsiveness of fibroblasts with regard to the photoaging and aging process, we examined the effect of ascorbic acid, TGF-beta, and IFN-gamma on collagen synthesis in dermal fibroblasts from three newborn foreskins (1 day old) and in both exposed and unexposed skin fibroblasts from 4 old individuals (60-76 years old) cultured in monolayer and in collagen gel. We demonstrated that basal levels of collagen synthesis decreased with increasing age. Photoaged fibroblasts in collagen gel showed greater basal collagen synthesis than aged fibroblasts in the same individuals, but similar basal collagen synthesis in monolayer cultures. Even though basal levels of collagen synthesis in collagen gel are downregulated in a photoaging- and aging-dependent manner, collagen synthesis by ascorbic acid in collagen gel, and by TGF-beta and IFN-gamma in both monolayer culture and collagen gel were regulated in a photoaging- and aging-independent manner. In monolayer culture, however, the responsiveness to ascorbic acid in newborn fibroblasts was greater than in photoaged and aged fibroblasts. Our results suggest that there are differences in collagen synthesis between photoaged and aged cells, depending on culture conditions. Responsiveness to ascorbic acid, TGF-beta and IFN-gamma related to collagen synthesis in photoaged and aged fibroblasts in collagen gel appears to be the same as in newborn fibroblasts, even though basal levels of collagen synthesis are downregulated in a photoaging- or aging-dependent manner.
Collapse
Affiliation(s)
- J H Chung
- Department of Dermatology, Seoul National University College of Medicine, South Korea
| | | | | | | | | | | |
Collapse
|
27
|
Abstract
It was examined whether calbindin D28k (CB) might be located in the rat incisor periodontal Ruffini ending, an essential mechanoreceptor in periodontal ligament, by light- and electron-microscopic immunohistochemistry. Some thick nerve fibers showing CB-like immunoreactivity (LI) entered the lingual half of the periodontal ligament of the incisor and showed the dendritic terminal arborization. Electron-dense immunoreaction products indicating CB-LI were distributed diffusely in axoplasm of the axon terminals, no mitochondria, however, were not labeled. Neither cell bodies nor cytoplasmic extensions of the terminal Schwann cells exhibited CB-LI. CB was presumed to be involved in the maintenance of Ca2+ homeostasis in the mechano-electric transduction in mechanoreceptors in the periodontal ligament.
Collapse
Affiliation(s)
- K Ochi
- Department of Oral Anatomy, Niigata University School of Dentistry, Gakkocho-dori, Japan.
| | | | | | | | | |
Collapse
|
28
|
Youn SH, Sakuda M, Kurisu K, Wakisaka S. Regeneration of periodontal primary afferents of the rat incisor following injury of the inferior alveolar nerve with special reference to neuropeptide Y-like immunoreactive primary afferents. Brain Res 1997; 752:161-9. [PMID: 9106452] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Regeneration of primary afferents and the expression of neuropeptide Y (NPY) in the lingual periodontal ligament of the rat incisor were examined following different types of injury (resection or crush) of the inferior alveolar nerve (IAN) combined with superior cervical ganglionectomy. In normal animals, protein gene product 9.5 (PGP 9.5)-like immunoreactivity (-LI) was localized in the middle areas of the alveolus-related part of lingual periodontal ligament; some of these nerve fibers showed terminal ramification and morphologies resembling those of the periodontal Ruffini endings, and very few thin varicose NPY-like immunoreactive (-IR) nerve fibers were detected around the blood vessels. Three days following crush injury of the IAN, the number of PGP 9.5-IR nerve fibers decreased, then increased to the normal levels around 10-15 days following injury. NPY-IR primary afferents first appeared around 5 days following crush injury, increased in number gradually, reaching a peak around 14 days, and then decreased. No NPY-IR primary afferents were detected 56 days following crush injury of the IAN. The terminal morphology of NPY-IR primary afferents observed around 10-14 days following injury was similar to that of PGP 9.5-IR nerve fibers in the normal animals, but less expanded. The changes in distribution of PGP 9.5-IR and NPY-IR nerve fibers following resection were similar to those observed following crush injury but regeneration was slightly delayed. The present results suggest that injury-evoked NPY is closely associated with the regeneration process of mechanoreceptors in the periodontal ligament following injury of the IAN.
Collapse
Affiliation(s)
- S H Youn
- Department of Orthodontics, Osaka University Faculty of Dentistry, Japan
| | | | | | | |
Collapse
|
29
|
Youn SH, Kwon OS, Park KC, Youn JI, Chung JH. Congenital onychodysplasia of the index fingers--Iso-Kikuchi syndrome. A case involving the second toenail. Clin Exp Dermatol 1996; 21:457-8. [PMID: 9167348 DOI: 10.1111/j.1365-2230.1996.tb00157.x] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [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: 02/04/2023]
Abstract
We report a case of congenital onychodysplasia of the index fingers (Iso-Kikuchi syndrome) in a 2-year-old boy who had nail deformities on both index fingers and the left second toe. He had a micronychia of the left index fingernail, malalignment and abnormal lunula of the right index fingernail and micronychia and malalignment of the left second toenail. Congenital onychodysplasia of the index fingers (COIF) is a rare condition characterized by various forms of nail dysplasia commonly involving the index fingers, but not infrequently also the neighbouring fingers such as the middle fingers and thumbs. The five criteria characterizing COIF include the following: (i) congenital occurrence; (ii) unilateral or bilateral index finger involvement; (iii) variability in nail appearance; (iv)possible hereditary involvement; and (v) frequently associated bone abnormalities. The nails of COIF include the full spectrum of nail dysplasia, from an irregular lunula, malalignment, micronychia (hypoplastic and rudimental), polyonychia (split rudimental), and anonychia, specifically affecting the index fingers. Our patient represents various forms of nail dysplasia of the both index fingers and left second toe such as micronychia, malalignment and abnormal lunula. To our knowledge, the association with second toenail dysplasia in COIF has not previously been reported.
Collapse
Affiliation(s)
- S H Youn
- Department of Dermatology, Seoul National University College of Medicine, Korea
| | | | | | | | | |
Collapse
|
30
|
Wakisaka S, Youn SH, Miyawaki Y, Kurisu K. The effects of peripheral nerve injury of the masseteric nerve on the levels of calcium binding proteins and neuropeptide Y, and their correlation in the mesencephalic trigeminal nucleus of the rat. Brain Res 1996; 735:249-56. [PMID: 8911663 DOI: 10.1016/0006-8993(96)00585-9] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [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: 02/03/2023]
Abstract
Combined retrograde neuronal tracing with FluoroGold (FG) and a double immunofluorescence method was performed to examine the effects of peripheral nerve injury of the masseteric nerve (MassN) on the levels of two calcium binding proteins (CaBPs), parvalbumin (PV) and calbindin D28k (CB), and neuropeptide Y (NPY) in the mesencephalic trigeminal nucleus (MesV) in the rat. In the normal MesV, many medium- to large-sized unipolar PV-like immunoreactive (-IR) cells were detected through the entire rostrocaudal extent, but CB-IR cells were rarely observed. No NPY-IR cells were observed in the normal MesV. The distributions of these three neurochemical markers in the MesV contralateral to the transection of Mass were almost identical to those observed in the normal MesV. Four days following transection and application of FG to the MassN, approximately 52% (572/1104) and 38% (414/1104) of FG-labeled cells (FG cells) in the MesV displayed PV-like immunoreactivity (-LI) and NPY-LI, respectively; Approximately 24% (265/1104) of FG cells showed both PV-LI and NPY-LI. Approximately 47% (265/572) of FG cells with PV-LI showed NPY-LI or 64% (265/414) of FG cells with NPY-LI displayed PV-LI. Fourteen days following transection and application of FG, the percentage of FG cells with PV-LI significantly decreased to 36% (365/1024) compared to that observed 4 days post-injury; approximately 44% (448/1024) of FG cells displayed NPY-LI; approximately 38% (141/365) of FG cells with PV-LI showed NPY-LI and approximately 31% (141/448) of FG cells with NPY-LI displayed PV-LI. In contrast, FG cells showing CB-LI were very rare on 4 days (1%; 15/1182) or 14 days (1%; 16/1085) following MassN transection. The present results indicate that the levels of PV in the MesV decreased 14 days following the MassN injury compared to those observed 4 days post-injury and rapid induction of NPY in the injured MesV neurons, and that the correlation between CaBP and NPY in the MesV following the MassN transection is different from that observed in the trigeminal ganglion, which is equivalent to the MesV, following peripheral nerve injury of the inferior alveolar nerve.
Collapse
Affiliation(s)
- S Wakisaka
- Department of Oral Anatomy and Development Biology, Osaka University Faculty of Dentistry, Japan
| | | | | | | |
Collapse
|
31
|
Wakisaka S, Miyawaki Y, Youn SH, Kato J, Kurisu K. Protein gene-product 9.5 in developing mouse circumvallate papilla: comparison with neuron-specific enolase and calcitonin gene-related peptide. Anat Embryol (Berl) 1996; 194:365-72. [PMID: 8896700 DOI: 10.1007/bf00198538] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
The present study was made to investigate the ontogeny of protein gene-product 9.5 (PGP 9.5)-like immunoreactivity (-LI) in the developing mouse circumvallate papilla (CVP), and its distribution was compared to that of neuron-specific enolase (NSE) and calcitonin gene-related peptide (CGRP). In adult CVP, PGP 9.5-LI was observed in the subgemmal nerve plexus; some thin PGP 9.5-like immunoreactive (-IR) nerve fibers penetrated taste buds and apical epithelium. PGP 9.5-LI was also observed in the spindle-shaped cells in taste buds, and a small number of round- or oval-shaped ganglionic cells in the lamina propria. The distribution of NSE-LI was comparable to that of PGP 9.5-LI. CGRP-LI was observed in the nerve fibers only; distribution of CGRP-IR nerve fibers was similar to that of PGP 9.5-IR nerve fibers, although the number of CGRP-IR nerve fibers was smaller than that of PGP 9.5-IR nerve fibers. At least six developmental stages were defined with regard to the developmental changes in the distribution of PGP 9.5-LI from embryonic day (E) 12 to adulthood: Stage I (E12-13)-a dense nerve plexus of PGP 9.5-IR nerve fibers was detected in the lamina propria beneath the core of newly-formed papilla. Stage II (E14-16) - thin PGP 9.5-IR nerve fibers penetrated the apical epithelium, and a few round-shaped cells in the apical epithelium also displayed PGP 9.5-LI. Stage III (E17-18) - thin PGP 9.5-IR nerve fibers penetrated the inner lateral epithelium of the trench. Stage IV [Postnatal day (P) 0-3] - many PGP 9.5-IR nerve fibers penetrated the outer lateral epithelium of the trench; later in this stage, taste buds appeared. Stage V (P5-10) - a small number of PGP 9.5-IR cells in the taste buds appeared, and their number increased gradually. Stage VI (P14-adult) - the number of PGP 9.5-IR taste cells increased and reached the adult level, while the number of PGP 9.5-IR nerve fibers decreased. The development of NSE-LI was similar to that of PGP 9.5-LI. CGRP-IR nerve fibers were detected at E12 in the lamina propria, and the development of the intraepithelial CGRP-IR nerve fibers was similar to that of PGP 9.5-IR nerve fibers. The present results indicate that invasion by nerve fibers of the epithelium of lingual papillae occurs in a complex manner, and that these nerve fibers may participate in the formation of the taste buds.
Collapse
Affiliation(s)
- S Wakisaka
- Department of Oral Anatomy and Developmental Biology, Osaka University Faculty of Dentistry, Japan.
| | | | | | | | | |
Collapse
|
32
|
Wakisaka S, Youn SH, Maeda T, Kurisu K. Immunoelectron microscopic study on neuropeptide Y in the periodontal ligament of the incisor following peripheral nerve injury to the inferior alveolar nerve in the rat. Brain Res 1996; 729:259-63. [PMID: 8876996] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Immunoelectron microscopic analysis was carried out to examine whether neuropeptide Y (NPY)-like immunoreactivity (-LI) is localized in mechanoreceptors in the lingual periodontal ligament of the rat incisor following peripheral nerve injury to the inferior alveolar nerve (IAN). In the lingual periodontal ligament of normal animals, no NPY-like immunoreactive (-IR) primary afferents were observed, except for a very few sympathetic perivascular nerve fibers which showed NPY-LI. Fourteen days following chronic constriction injury to the IAN combined with sympathectomy of the superior cervical ganglion, thick NPY-IR nerve fibers showing tree-like raminifications were detected in the shear zone between the tooth-related part and alveolus-related part as well as in the alveolus-related part. Immunoelectron microscopy revealed that expanded NPY-IR nerve terminals were covered with several Schwann sheaths and that a part of the axoplasm expanded to the surrounding tissues. These ultrastructural features of NPY-IR structures were identical to those of periodontal Ruffini endings, categorized as slowly adapting mechanoreceptors. Thick (6-8 microns in diameter) NPY-IR axons were also observed without any apparent myelin sheath. The present results provide further evidence that NPY is closely associated with thick axons, probably myelinated nerves and Ruffini endings, following peripheral nerve injury.
Collapse
Affiliation(s)
- S Wakisaka
- Department of Oral Anatomy and Developmental Biology, Osaka University Faculty of Dentistry, Japan
| | | | | | | |
Collapse
|
33
|
Wakisaka S, Youn SH, Maeda T, Kurisu K. Neuropeptide Y-like immunoreactive primary afferents in the periodontal tissues following dental injury in the rat. Regul Pept 1996; 63:163-9. [PMID: 8837225 DOI: 10.1016/0167-0115(96)00038-9] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
The distribution of neuropeptide Y (NPY)-like immunoreactive (-IR) nerve fibers in the periodontal tissues following dental injury to the rat maxillary first molar was examined with a combination of dental injury and surgical sympathectomy of the superior cervical ganglion (SCGx). In normal animals, NPY-IR nerve fibers were observed around the blood vessels of the trigeminal ganglion, dental pulp and periodontal tissues. These nerve fibers completely disappeared following SCGx. Fourteen days following dental injury of the maxillary first molar combined with SCGx, a small number NPY-IR cells was observed in the dorsal to middle portion of the maxillary division of the trigeminal ganglion. These were mostly medium- to large-sized cells with a mean +/- SD cross-sectional area of 541.4 +/- 239.3 microns 2. Approx. 50% of these cells had the cross-sectional areas between 400-600 micron 2. In the periodontal tissues of injured first molar, thick NPY-IR nerve fibers showing an irregular appearance were detected in the apical region. Immunoelectron microscopy showed that most NPY-IR nerve fibers near the lower half of the injured periodontal ligament had an axonal diameter of approx. 7-8 microns, and lacked apparent myelin sheaths. Near NPY-IR nerve fibers, many macrophages with phagosomes containing debris of the myelin sheaths were observed. At the oral epithelium covering the injured roots of the maxillary first molar, thick NPY-IR nerve fibers were recognizable and some penetrated the epithelium. No NPY-IR nerve fibers were observed in the dental pulp or periodontal tissues in second and third molars, and ultrastructural views of nerve fibers were almost intact following combined SCGx and dental injury to the first molar. The present results indicate that NPY-IR primary afferents appeared in the periodontal tissues following dental injury, and that NPY may be closely associated with the regeneration process of injured primary afferents.
Collapse
Affiliation(s)
- S Wakisaka
- Department of Oral Anatomy and Developmental Biology, Osaka University Faculty of Dentistry, Japan.
| | | | | | | |
Collapse
|
34
|
Wakisaka S, Itotagawa T, Youn SH, Kato J, Kurisu K. Distribution and possible origin of galanin-like immunoreactive nerve fibers in the mammalian dental pulp. Regul Pept 1996; 62:137-43. [PMID: 8795077 DOI: 10.1016/0167-0115(96)00016-x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Human, dog, cat and rat dental pulps were investigated for the presence and distribution of galanin-like immunoreactive (-IR) nerve fibers, and the possible origin of pulpal galanin-IR nerve fibers in the rat was examined. Galanin-IR nerve fibers were present in the dental pulps of all species examined. Two types of galanin-IR nerve fibers were distinguished with regard to morphology; thin varicose nerve fibers and thick smooth-surfaced nerve fibers. Thin varicose galanin-IR nerve fibers were seen to run along the blood vessel in the human, dog and cat root pulp. In the coronal pulp, galanin-IR nerve fibers ran toward the odontoblastic layer but they did not form the subodontoblastic nerve plexus. In rat molar pulp, few galanin-IR nerve fibers were observed; the distribution of these nerve fibers was similar to those in human, dog and cat pulp. In contrast, many thick smooth-surfaced galanin-IR nerve fibers were observed near the blood vessels in incisor pulp of the rat; occasionally a few varicose galanin-IR nerve fibers were also observed. Transection of the inferior alveolar nerve or mandibular nerve caused complete disappearance of galanin-IR nerve fibers in rat dental pulp, while surgical sympathectomy of the superior cervical ganglion did not affect their distribution. The present results indicate that galanin-IR nerve fibers are present in the mammalian dental pulp, and that the intrapulpal galanin-IR nerve fibers in the rat originate from the trigeminal ganglion and are primary afferents.
Collapse
Affiliation(s)
- S Wakisaka
- Department of Oral Anatomy and Developmental Biology, Osaka University, Faculty of Dentistry, Japan.
| | | | | | | | | |
Collapse
|
35
|
Chung JH, Youn SH, Koh WS, Eun HC, Cho KH, Park KC, Youn JI. Ultraviolet B irradiation-enhanced interleukin (IL)-6 production and mRNA expression are mediated by IL-1 alpha in cultured human keratinocytes. J Invest Dermatol 1996; 106:715-20. [PMID: 8618010 DOI: 10.1111/1523-1747.ep12345608] [Citation(s) in RCA: 66] [Impact Index Per Article: 2.4] [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: 01/31/2023]
Abstract
Ultraviolet (UV) B radiation may trigger cutaneous inflammatory responses by directly inducing epidermal keratinocytes to elaborate specific cytokines such as interleukin (IL-1) and IL-6. Because IL-1 is a potent inducer of IL-6, one may speculate that the release of IL-6 by keratinocytes after UV exposure is mediated via the release of IL-1 in an autocrine or paracrine manner. We demonstrated that UVB irradiation upregulated IL-1 alpha mRNA at a lower dose (15 mJ/cm2) and then downregulated IL-1 alpha mRNA expression at high doses (30-40 mJ/cm2). The kinetic profile of IL-1alpha mRNA expression showed a biphasic response, with the early increase by 1 h after UV exposure and the secondary increase at 6 h after UV. On the other hand, the expression of IL-6 mRNA was increased with increasing doses of UVB (0-45 m/J/cm2) and showed a single peak at 6 h post UV. These results may indicate that UVB radiation could regulate the expression of IL-1alpha and IL-6 mRNA in keratinocytes by different mechanisms. Our data show that anti-human IL-1alpha antibody inhibits UV-induced IL-6 production and mRNA expression in cultured keratinocytes. The addition of recombinant IL-1alpha to the medium increased IL-6 synthesis and augmented IL-6 production and mRNA expression in cultured human keratinocytes by UVB irradiation. These results support the hypothesis that UVB irradiation-enhanced IL-6 production and mRNA expression may be mediated by IL-1alpha.
Collapse
Affiliation(s)
- J H Chung
- Department of Dermatology, Seoul National University College of Medicine, Korea
| | | | | | | | | | | | | |
Collapse
|
36
|
Chung JH, Youn SH, Kwon OS, Eun HC, Kim KH, Park KC, Cho KH, Youn JI. Enhanced proliferation and collagen synthesis of human dermal fibroblasts in chronically photodamaged skin. Photodermatol Photoimmunol Photomed 1996; 12:84-9. [PMID: 8897594 DOI: 10.1111/j.1600-0781.1996.tb00180.x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Cutaneous aging can be divided into intrinsic aging and photoaging. We investigated the influence of aging and photoaging on the proliferation and collagen synthesis of human dermal fibroblasts cultured 3-dimensionally in a collagen gel. We examined 11 human dermal fibroblast cell lines cultured from 3 newborn skins (1 day old), and both exposed and unexposed skin from 4 elderly volunteers (60, 60, 73, 76 years old), respectively. Newborn fibroblasts actively proliferated within the attached collagen gels compared with the elderly cell lines. Within the attached collagen gels in the presence of 10% fetal calf serum (FCS), the fibroblasts from exposed skin proliferated rapidly compared with fibroblasts from unexposed skin from the same individuals. In collagen gel and monolayer cultures with 1% FCS, the percentage of collagen synthesized by photoaged and aged fibroblasts decreased significantly compared with that by newborn fibroblasts. When the fibroblasts were cultured three dimensionally in attached collagen gels in the presence of 1% FCS, the relative levels of collagen synthesis by cultured fibroblasts from photoaged skin were increased significantly compared with those of aged skin fibroblasts from the same individuals. These results suggest that fibroblasts of exposed skin may be more active than those of unexposed skin and that the three-dimensional culture of fibroblast can be used as a model to investigate the influence of aging and photoaging on cell functions.
Collapse
Affiliation(s)
- J H Chung
- Department of Dermatology, Seoul National University College of Medicine, Republic of Korea
| | | | | | | | | | | | | | | |
Collapse
|
37
|
Wakisaka S, Youn SH, Kato J, Takemura M, Kurisu K. Neuropeptide Y-immunoreactive primary afferents in the dental pulp and periodontal ligament following nerve injury to the inferior alveolar nerve in the rat. Brain Res 1996; 712:11-8. [PMID: 8705292 DOI: 10.1016/0006-8993(95)01421-7] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.8] [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: 02/01/2023]
Abstract
The distribution of neuropeptide Y (NPY)-immunoreactive (IR) primary afferents in the dental pulp and periodontal ligament of the rat mandible were examined following combined chronic constriction injury (CCI) of the inferior alveolar nerve (IAN) and sympathectomy of the superior cervical ganglion (SCG). NPY-IR nerve fibers were observed around the blood vessels in the trigeminal ganglion, dental pulp and periodontal ligament in normal animals. Following combined CCI of the IAN and sympathectomy of SCG (SCGx), perivascular NPY-IR nerve fibers originating from SCG disappeared completely, but many NPY-IR nerve fibers coming from the trigeminal ganglion appeared in the dental pulp and periodontal ligament. In the molar dental pulp, thick NPY-IR nerve fibers were observed within the nerve bundle, and some thin NPY-IR nerve fibers ran towards the odontoblast layer; very few NPY-IR nerve fibers were observed in the incisor pulp. In the periodontal ligament of molar, thick NPY-IR nerve fibers appeared at the alveolar part following combined CCI of IAN and SCGx. In the lingual portion of the periodontal ligament of the incisor, many thick NPY-IR nerve fibers were observed. These occasionally showed a tree-like appearance, resembling immature Ruffini endings; slowly adapting mechanoreceptors. The present results indicate that periodontal mechanoreceptors are among the main targets of injury-evoked NPY following IAN injury.
Collapse
Affiliation(s)
- S Wakisaka
- Department of Oral Anatomy and Developmental Biology, Osaka University Faculty of Dentistry, Japan.
| | | | | | | | | |
Collapse
|
38
|
Wakisaka S, Takikita S, Youn SH, Kurisu K. Partial coexistence of neuropeptide Y and calbindin D28k in the trigeminal ganglion following peripheral axotomy of the inferior alveolar nerve in the rat. Brain Res 1996; 707:228-34. [PMID: 8919300 DOI: 10.1016/0006-8993(95)01262-1] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [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: 02/03/2023]
Abstract
Immunohistochemistry was applied to examine the correlation between neuropeptide Y (NPY) and the two calcium binding proteins (CaBPs) parvalbumin (PV) and calbindin D28k (CB) in the trigeminal ganglion following peripheral axotomy of the inferior alveolar nerve (IAN) in the rat. Five days following transection and application of FluoroGold (FG) to the cut end of the IAN, approximately 14.8% (80/539) and 18.6% (90/483) of FG-labeled IAN neurons in the trigeminal ganglion showed PV-like immunoreactivity (-LI) and CB-LI, respectively. The mean +/- S.D. area of FG-labeled PV-like immunoreactive (-IR) cells (FG/PV-IR cells) and FG/CB-IR cells were 835.9 +/- 303.1 mu m2 and 712.7 +/- 246.0 mu m2, respectively. FG/PV-IR cells were significantly larger than FG/CB-IR cells. Fourteen days following peripheral axotomy of the IAN, NPY-LI appeared in the medium- to large-sized cells. Double immunostaining revealed that approximately 3.3% (52/1569) of NPY-IR cells in the axotomized trigeminal ganglion displayed PV-LI, while approximately 26.7% (371/1392) of NPY-IR cells displayed CB-LI. The mean +/- S.D. cross-sectional areas of PV-IR and CB-IR trigeminal ganglion cells displaying NPY-LI were 819.5 +/- 265.6 mu m2 and 766.5 +/- 279.7 mu m2, respectively. There were no significant differences in the cross-sectional areas either between NPY/PV-IR cells and NPY/CB-IR cells, or between FG/PV-IR cells and NPY/PV-IR cells, or between FG/CB-IR cells and NPY/CB-IR cells. The present results indicate that injury-evoked medium- to large-sized NPY neurons were a different population from large-sized PV neurons, and NPY was partly co-localized with CB.
Collapse
Affiliation(s)
- S Wakisaka
- Department of Oral Anatomy and Developmental Biology, Osaka University Faculty of Dentistry, Japan.
| | | | | | | |
Collapse
|
39
|
Dill K, Huang LH, McGown EL, Youn SH, O'Connor RJ. Substituent effects on the binding constants of arsenical-dithiol adducts. Res Commun Chem Pathol Pharmacol 1991; 72:367-70. [PMID: 1947439] [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: 12/29/2022]
Abstract
Proton nuclear magnetic resonance spectroscopy (1H NMR) was used to determine the relative binding constants for several arsenical-dithiol adducts. The compounds investigated were 2,3-dimercaptopropanol (British anti-lewisite; BAL), 1,2-ethane dithiol (ET), and 1,2-propane dithiol (PDT). It was found that PDT has a significantly higher affinity than ET or BAL for phenyldichloroarsine (PDA) in methanol.
Collapse
Affiliation(s)
- K Dill
- Department of Chemistry, Clemson University, SC 29634-1905
| | | | | | | | | |
Collapse
|