76
|
Yao W, Cai X, Liu C, Qin Y, Cheng H, Ji S, Xu W, Wu C, Chen T, Xu J, Long J, Fang Z, Qu B, Hoth M, Ni Q, Zha X, Yu X. Profilin 1 Potentiates Apoptosis Induced by Staurosporine in Cancer Cells. Curr Mol Med 2013. [DOI: 10.2174/156652413805076812] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
|
77
|
Yao W, Cai X, Liu C, Qin Y, Cheng H, Ji S, Xu W, Wu C, Chen T, Xu J, Long J, Fang Z, Qu B, Hoth M, Ni Q, Zha X, Yu X. Profilin 1 Potentiates Apoptosis Induced by Staurosporine in Cancer Cells. Curr Mol Med 2013. [DOI: 10.2174/1566524011313030011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
|
78
|
Xu J, Zhu W, Xu W, Yao W, Zhang B, Xu Y, Ji S, Liu C, Long J, Ni Q, Yu X. Up-Regulation of MBD1 Promotes Pancreatic Cancer Cell Epithelial-Mesenchymal Transition and Invasion by Epigenetic Down-Regulation of E-Cadherin. Curr Mol Med 2013. [DOI: 10.2174/1566524011313030008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
|
79
|
Bedford A, Li Z, Li M, Ji S, Liu W, Huai Y, de Lange CFM, Li J. Epidermal growth factor-expressing Lactococcus lactis enhances growth performance of early-weaned pigs fed diets devoid of blood plasma. J Anim Sci 2012; 90 Suppl 4:4-6. [DOI: 10.2527/jas.53973] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
|
80
|
Ji S, Yarmohammadi H, Hoyt H, Hansford R, Zviman M, Steinberg S, Judge D, Caffo B, Tomaselli G, Halperin H, Cheng A, Spragg D, Henrikson C, Sinha S, Marine J, Berger R, Calkins H, Nazarian S. Association of Atrial Myocardial Fibrosis with a Common Matrix Metalloproteinase-2 Promoter Polymorphism. Heart Rhythm 2012. [DOI: 10.1016/j.hrthm.2012.09.123] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
|
81
|
Ji S, Sun R, Zhang L, Tian Y. Whole Brain Irradiation-induced Decrease of Histone H3 Acetylation in Hippocampus of Rats. Int J Radiat Oncol Biol Phys 2012. [DOI: 10.1016/j.ijrobp.2012.07.1776] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
|
82
|
Cheng Z, Ji S, Stephens N, Fitzgerald R, Cenkowski S. P46 The impact of hydrogen sulfide on ovalbumin-sensitized canine trachealis smooth muscle. Nitric Oxide 2012. [DOI: 10.1016/j.niox.2012.08.047] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
83
|
Cho SY, Park HD, Lee YW, Ki CS, Lee SY, Sohn YB, Park SW, Kim SH, Ji S, Kim SJ, Choi EW, Kim CH, Ko AR, Paik KH, Lee DH, Jin DK. Mutational spectrum in eight Korean patients with 3-methylcrotonyl-CoA carboxylase deficiency. Clin Genet 2011; 81:96-8. [DOI: 10.1111/j.1399-0004.2011.01704.x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
84
|
Wang C, Ji S, Wu Q, Wu C, Wang Z. Determination of Triazine Herbicides in Environmental Samples by Dispersive Liquid-Liquid Microextraction Coupled with High Performance Liquid Chromatography. J Chromatogr Sci 2011; 49:689-94. [DOI: 10.1093/chrsci/49.9.689] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
|
85
|
Ji S, Ates C, Lesanovsky I. Two-dimensional Rydberg gases and the quantum hard-squares model. PHYSICAL REVIEW LETTERS 2011; 107:060406. [PMID: 21902304 DOI: 10.1103/physrevlett.107.060406] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/15/2011] [Revised: 06/27/2011] [Indexed: 05/31/2023]
Abstract
We study a two-dimensional lattice gas of atoms that are photoexcited to Rydberg states in which they interact via the van der Waals interaction. We explore the regime of dominant nearest-neighbor interaction where this system is intimately connected with a quantum version of Baxter's hard-squares model. We show that the strongly correlated ground state of the Rydberg gas can be analytically described by a projected entangled pair state that constitutes the ground state of the quantum hard-squares model. This correspondence allows us to identify a phase boundary where the Rydberg gas undergoes a transition from a disordered (liquid) phase to an ordered (solid) phase.
Collapse
|
86
|
Ji S, Doucette JR, Nazarali AJ. Sirt2 is a novel in vivo downstream target of Nkx2.2 and enhances oligodendroglial cell differentiation. J Mol Cell Biol 2011; 3:351-9. [DOI: 10.1093/jmcb/mjr009] [Citation(s) in RCA: 63] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
|
87
|
Wilson B, Valdes P, Leblond F, Kim A, Harris B, Fan X, Torteston T, Hartov A, Ji S, Paulsen K, Roberts D. Quantitative measurements of ALA-induced PpIX during brain tumor resection. Photodiagnosis Photodyn Ther 2011. [DOI: 10.1016/j.pdpdt.2011.03.130] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
88
|
Si W, Lu Y, He X, Ji S, Niu Y, Tan T, Ji W. 116 IMPROVED SURVIVAL BY CRYOPRESERVING RHESUS MACAQUE (MACACA MULATTA) SPERMATOZOA WITH DIRECTIONAL FREEZING TECHNIQUE. Reprod Fertil Dev 2010. [DOI: 10.1071/rdv22n1ab116] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
A significant increase in nonhuman primate models of human diseases will be expected in the near future since the successes in production of genetically engineered rhesus monkey models of human diseases. Sperm banking can provide an effective way to preserve valuable genetic resources. Our objective was to (1) develop a protocol using directional freezing technique (DFT) for rhesus monkey spermatozoa cryopreservation, which allows precise control of the velocity and the morphology of the ice-front propagation by transferring the tubes loaded with 2 mL sperm samples at a controllable velocity through two separate chambers with controllable temperature settings, and (2) achieve survival rate that was higher than that achieved with conventional freezing technique (CFT), by which sperm samples were cryopreserved in 0.25 mL straws with liquid nitrogen vapor in a styrofoam box. Sperm motility, acrosomal integrity, and in vitro fertilization (IVF) assay were used to assess the function of frozen-thawed spermatozoa. Data were analyzed by ANOVA and Fisher protected LSD test. Experiment 1 was aimed at optimizing the cooling rate using DFT. Tubes were frozen using the multi-thermal gradient freezing device (MTG 516, Harmony CryoCareTM, IMT Ltd.) at fast (16°C/min), medium (12°C/min), and slow (7°C/min) cooling rates, which corresponded to the transferring velocities (2.5, 1.5, and 0.5 mm s-1, respectively). The results showed that spermatozoa frozen at fast and medium cooling rates showed significantly higher frozen-thawed motility than those frozen at slow cooling rate (61% and 59% v. 50%, P < 0.05). However, no difference was observed on sperm acrosomal integrity among the experimental groups (84, 80, and 78%, respectively, P > 0.05). The purposes of Experiment 2 were determined to examine if using DFT at the optimized cooling rate (12°C/min) can improve the cryo-survival of rhesus monkey spermatozoa compared with CFT. Our results showed that spermatozoa cryopreserved by using DFT achieved significantly higher frozen-thawed sperm motility that those cryopreserved by using CFT (64 v. 54%, P < 0.05). However, no difference was observed on acrosomal integrity between spermatozoa cryopreserved by DFT and CFT (84 and 83%, respectively; P > 0.05). The function of spermatozoa cryopreserved by using DFT was further evaluated by IVF. Females were treated with rhFSH twice-daily for 8 days after the onset of menses and following a treatment of hCG injection on Day 9. Cumulus-oocyte complexes were collected by laparoscopic follicular aspiration 32 h later. Of the inseminated oocytes, 79% were fertilized and 90 and 53% of the resulting zygotes developed into 2-cell and blastocysts, respectively. The fertilization rate was lower and the blastocyst rate was slightly higher than our previous report when fresh spermatozoa were used for IVF (94 and 52%, respectively). Our results indicate that spermatozoa of rhesus monkeys can be effectively cryopreserved using DFT in large volume. This finding provided a new and effective way for genetics preservation purposes in this important species.
Collapse
|
89
|
Ji S, Lee SH, Broholm C, Koo TY, Ratcliff W, Cheong SW, Zschack P. Spin-lattice order in frustrated ZnCr2O4. PHYSICAL REVIEW LETTERS 2009; 103:037201. [PMID: 19659312 DOI: 10.1103/physrevlett.103.037201] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/12/2009] [Indexed: 05/28/2023]
Abstract
Using synchrotron x-ray and neutron diffraction, we disentangle spin-lattice order in highly frustrated ZnCr2O4 where magnetic chromium ions occupy the vertices of regular tetrahedra. Upon cooling below 12.5 K the quandary of antialigning spins surrounding the triangular faces of tetrahedra is resolved by establishing weak interactions on each triangle through an intricate lattice distortion. However, the resulting spin order is not simply a Néel state on strong bonds, but rather a complex coplanar spin structure, indicating that antisymmetric and/or further neighbor exchange interactions also play a role as ZnCr2O4 resolves conflicting magnetic interactions.
Collapse
|
90
|
Kofu M, Kim JH, Ji S, Lee SH, Ueda H, Qiu Y, Kang HJ, Green MA, Ueda Y. Weakly coupled s=1/2 quantum spin singlets in Ba3Cr2O8. PHYSICAL REVIEW LETTERS 2009; 102:037206. [PMID: 19257389 DOI: 10.1103/physrevlett.102.037206] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/29/2008] [Revised: 11/24/2008] [Indexed: 05/27/2023]
Abstract
Using single crystal inelastic neutron scattering with and without the application of an external magnetic field and powder neutron diffraction, we have characterized magnetic interactions in Ba3Cr2O8. Even without a field, we found that there exist three singlet-to-triplet excitation modes in the (h, h, l) scattering plane. Our complete analysis shows that the three modes are due to spatially anisotropic interdimer interactions that are induced by lattice distortions of the tetrahedron of oxygens surrounding the Jahn-Teller active Cr5+(3d1). The strong intradimer coupling of J0=2.38(2) meV and weak interdimer interactions (|Jinter|< or =0.52(2) meV) makes Ba3Cr2O8 a good model system for weakly coupled s=1/2 quantum spin dimers.
Collapse
|
91
|
Wen J, Li L, Chen J, Ji S, Zheng C, Liu Z. Tripterygium wilfordii hook f increase the blood concentration of tacrolimus. Transplant Proc 2008; 40:3679-82. [PMID: 19100464 DOI: 10.1016/j.transproceed.2008.08.132] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2007] [Accepted: 08/12/2008] [Indexed: 10/21/2022]
Abstract
OBJECTIVE To observe the influence of the Tripterygium wilfordii Hook F (T II) on the blood concentration of tacrolimus and analyze the impact of this effect. METHOD Twenty-two renal transplant receipts taking tacrolimus combined with the T II were selected for this study. We analyzed the blood concentrations and the rate of concentration compared with dosage (C/D rate) pre- and postcombination over 6 months. All cases underwent the CYP3A5 genotype test. RESULT The concentrations of tacrolimus were raised to a certain degree after the combination in all the cases. The first-time elevation differed from 1 week to 4 months. The C/D rate increased by 1.7 to 7.2 times with most evaluated C/D rates ranging from 1.8 to 3.8. The elevated C/D rate of the subgroup of CYP3A5 1/1 and 1/3 (n = 10) contrasted with the 3/3 genotype subgroup (n = 12: 2.99 +/- 1.71 vs 2.55 +/- 1.07; P = .472). The mycophenolate mofetil subgroup (n = 17) was not contrasted to the mizoribine subgroup (n = 5: 2.85 +/- 1.51 vs 2.31 +/- 0.26; P = .498). CONCLUSION T II considerably increased the blood concentration and the C/D rate of tacrolimus. The degree of increase was probably not related to the CYP3A5 genotype and the combination of immunosuppressive agents.
Collapse
|
92
|
Kim JH, Ji S, Lee SH, Lake B, Yildirim T, Nojiri H, Kikuchi H, Habicht K, Qiu Y, Kiefer K. External magnetic field effects on a distorted kagome antiferromagnet. PHYSICAL REVIEW LETTERS 2008; 101:107201. [PMID: 18851251 DOI: 10.1103/physrevlett.101.107201] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/31/2008] [Revised: 07/10/2008] [Indexed: 05/26/2023]
Abstract
We report bulk magnetization, and elastic and inelastic neutron scattering measurements under an external magnetic field H on the weakly coupled distorted kagome system, Cu2(OD)3Cl. Our results show that the ordered state below 6.7 K is a canted antiferromagnet and consists of large antiferromagnetic ac components and smaller ferromagnetic b components. By first-principles calculations and linear spin wave analysis, we present a simple spin Hamiltonian with nonuniform nearest neighbor exchange interactions resulting in a system of coupled spin trimers with a single-ion anisotropy that can qualitatively reproduce the spin dynamics of Cu2(OD)3Cl.
Collapse
|
93
|
Chen J, Li L, Wen J, Tang Z, Ji S, Sha G, Cheng Z, Sun Q, Cheng D, Liu Z. Observation of efficacy and safety of converting the calcineurin inhibitor to sirolimus in renal transplant recipients with chronic allograft nephropathy. Transplant Proc 2008; 40:1411-5. [PMID: 18589119 DOI: 10.1016/j.transproceed.2008.03.096] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2007] [Accepted: 03/06/2008] [Indexed: 12/19/2022]
Abstract
OBJECTIVE The objective of this study was to evaluate the efficacy and safety of converting from a calcineurin inhibitor (CNI) to sirolimus among renal transplant recipients with chronic allograft nephropathy (CAN). METHODS In 16 patients with CAN, substituted sirolimus for CsA or FK506 and observed the incidence of acute rejection and changes in serum creatinine, triglycerides, cholesterol, blood uric acid, and peripheral blood leukocyte/platelet counts within 12 months. All recipients underwent an allograft biopsy before conversion. The targeted sirolimus level was 4-8 ug/L. RESULTS After conversion to sirolimus, the creatinine level of 7 cases decreased and the efficacy rate was (43.8%). No acute rejection occurred during the follow-up. The cases with hypercholesteremia increased from 3 to 7 after conversion; hypertriglyceridemia increased from 3 to 5; leukopenia occurred in 2; subnormal platelet counts increased from 2 to 3; and hyperuricemia increased from 6 to 7. Meanwhile, the average level of peripheral blood leukocytes obviously decreased in the first month, the average peripheral blood cholesterol increased over 12 months, but the average content of peripheral blood platelets, triglyceride and blood uric acid failed to display as statistic difference. Eight patients showed C4d deposition in peritubular capillary in graft tissue before conversion, 7 cases of whom showed no improvement in renal function. In 6 cases there was no C4d deposition in peritubular capillary in graft tissue. Only 2 of 6 cases showed no improvement in renal function. There were 6 patients whose creatinine level was <2.48 mg/dL before conversion, and renal function in 5 of them improved in a year after conversion. In contrast, among 10 patients whose blood creatinine level was >2.48 mg/dL, only 2 cases improved. CONCLUSION It is safe for patients with CAN to use substitute sirolimus for CNI; the incidence of acute rejection did not increase. In this study, 43.8% of patients showed improved renal function. The main adverse reactions after conversion to sirolimus were hypercholesteremia and decreased peripheral blood leukocytes. The serum creatinine level and the deposition of C4d in peritubular capillary were important factors influencing therapeutic efficacy.
Collapse
|
94
|
Shin J, Ji S, Choi Y. Ability of oral bacteria to induce tissue-destructive molecules from human neutrophils. Oral Dis 2008; 14:327-34. [PMID: 18449962 DOI: 10.1111/j.1601-0825.2007.01382.x] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
AIM The induction of tissue-destructive molecules from neutrophils by periodontopathic bacteria has been suggested as one of the mechanisms of periodontal destruction. The aim of this study was to determine whether the ability to stimulate neutrophils is an authentic characteristic of periodontopathic bacteria. METHODS We evaluated, along with phagocytosis, the production of reactive oxygen species (ROS), matrix metalloproteinase-8 (MMP-8), and interleukin-1beta by neutrophils in response to non-periodontopathic Streptococcus sanguinis and periodontopathic bacteria Fusobacterium nucleatum and Treponema denticola, in the absence or presence of antibodies. Phagocytosis, the death of neutrophils, and intracellular ROS production were measured by flow cytometry and the concentrations of MMP-8 and interleukin-1beta secreted into medium were determined by enzyme-linked immunosorbent assay. RESULTS S. sanguinis and F. nucleatum induced greater production of ROS, MMP-8, and interleukin-1beta than did T. denticola. The levels of tissue-destructive molecules produced by neutrophils had a positive correlation with phagocytosis. Opsonization of bacteria with antibodies significantly increased phagocytosis and ROS production and release, thus increasing both bacterial clearance and potential tissue damage. CONCLUSION The ability of oral bacteria to induce tissue-destructive molecules from neutrophils is not an inherent characteristic of periodontopathic bacteria, which would provide a new insight into the role of neutrophils in periodontal destruction.
Collapse
|
95
|
Ji S, Kim Y, Min BM, Han SH, Choi Y. Innate immune responses of gingival epithelial cells to nonperiodontopathic and periodontopathic bacteria. J Periodontal Res 2008; 42:503-10. [PMID: 17956462 DOI: 10.1111/j.1600-0765.2007.00974.x] [Citation(s) in RCA: 83] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
BACKGROUND AND OBJECTIVE We have previously reported different susceptibilities of periodontopathic and nonperiodontopathic bacteria to antimicrobial peptides and phagocytosis by neutrophils. Differences between the two groups of bacteria may exist also in their ability to induce immune responses from the host. Therefore, we evaluated the effects of various oral bacteria on innate immune responses by gingival epithelial cells. MATERIAL AND METHODS HOK-16B cells were cocultured with live or lysed nonperiodontopathic (n = 3) and periodontopathic (n = 5) bacterial species. The levels of human beta defensin-1, -2 and -3, and of the cathelicidin, LL-37, were examined by real-time reverse transcription-polymerase chain reaction, and the accumulated interleukin-8 and interleukin-1 alpha were measured by enzyme-linked immunosorbent assay. RESULTS Nonperiodontopathic bacteria up-regulated some antimicrobial peptides without affecting the levels of cytokines. In the periodontopathic group, the orange-complex bacteria induced antimicrobial peptides and interleukin-8 efficiently, but the red-complex bacteria often demonstrated suppressive effects. In contrast to live bacteria, bacterial lysates had no suppressive effects. In addition, some bacterial lysates demonstrated a reduced ability to induce antimicrobial peptides compared with live bacteria. CONCLUSION The nonperiodontopathic, the orange-complex, and the red-complex bacteria had different effects on the innate immune responses from gingival epithelial cells, which may affect the outcome of their host-microbial interaction in gingival sulcus.
Collapse
|
96
|
Ji S, Corredig M, Goff H. Production and functional properties of micellar casein/κ-carrageenan aggregates. Int Dairy J 2008. [DOI: 10.1016/j.idairyj.2007.07.001] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
97
|
Koo J, Song C, Ji S, Lee JS, Park J, Jang TH, Yang CH, Park JH, Jeong YH, Lee KB, Koo TY, Park YJ, Kim JY, Wermeille D, Goldman AI, Srajer G, Park S, Cheong SW. Non-resonant and resonant x-ray scattering studies on multiferroic TbMn2O5. PHYSICAL REVIEW LETTERS 2007; 99:197601. [PMID: 18233114 DOI: 10.1103/physrevlett.99.197601] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/18/2007] [Indexed: 05/25/2023]
Abstract
Comprehensive x-ray scattering studies, including resonant scattering at Mn L, Tb L, and M edges, were performed on single crystals of TbMn2O5 for crystallographic data to elucidate the nature of its commensurate and incommensurate phases. The scattering results provide direct evidence of symmetry lowering to the ferroelectric phase driven by magnetically induced lattice modulations and show the presence of multiple magnetic orders. The competing orders under spin-frustrated geometry are believed to cause discommensuration and result in the commensurate-to-incommensurate phase transition around 24 K. It is proposed that the low temperature incommensurate phase consists of commensurate domains separated by antiphase domain walls which change both signs of spontaneous polarizations and x-ray scattering amplitudes for forbidden reflections.
Collapse
|
98
|
Ji S, Hyun J, Park E, Lee BL, Kim KK, Choi Y. Susceptibility of various oral bacteria to antimicrobial peptides and to phagocytosis by neutrophils. J Periodontal Res 2007; 42:410-9. [PMID: 17760818 DOI: 10.1111/j.1600-0765.2006.00962.x] [Citation(s) in RCA: 94] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
BACKGROUND AND OBJECTIVE The aim of this study was to compare the susceptibility of nonperiodontopathic and periodontopathic bacteria to major defense mechanisms for bacterial clearance in gingival sulcus. MATERIAL AND METHODS Twenty strains of 13 oral bacterial species were studied for their susceptibility to phagocytosis by human neutrophils and to the antimicrobial peptides LL-37 and human beta defensin-3. The minimum inhibitory concentrations of LL-37 and human beta defensin-3 were determined by a liquid dilution assay, and susceptibility to phagocytosis was examined by a flow cytometric phagocytosis assay. RESULTS The minimum inhibitory concentrations of LL-37 and human beta defensin-3 varied greatly, depending on the strain and species. Although a significant difference between the non- and periodontopathic groups was not observed, the red-complex bacteria were more resistant to LL-37 than the others (p=0.004). The susceptibility of oral bacteria to phagocytosis was quite variable, depending on the species but not on the strains. The periodontopathic bacteria, especially Actinobacillus actinomycetemcomitans and the red-complex triad, were more resistant to phagocytosis than were the nonperiodontopathic bacteria (p=0.0003). In addition, bacteria resistant both to antimicrobial peptides and to phagocytosis were more common in the periodontopathic group. CONCLUSION Our results indicate that immune evasion may contribute to the pathogenicity of some periodontopathic bacteria.
Collapse
|
99
|
Ji S, Song C, Koo J, Park J, Park YJ, Lee KB, Lee S, Park JG, Kim JY, Cho BK, Hong KP, Lee CH, Iga F. Resonant X-ray scattering study of quadrupole-strain coupling in DyB4. PHYSICAL REVIEW LETTERS 2007; 99:076401. [PMID: 17930908 DOI: 10.1103/physrevlett.99.076401] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/21/2007] [Indexed: 05/25/2023]
Abstract
X-ray and neutron scattering studies were performed on DyB4 which exhibits both a quadrupolar ordering and a macroscopic lattice distortion. A forbidden reflection at 7.792 keV near the Dy L3 absorption edge is identified as a quadrupolar ordering peak, and the quadrupolar order and a monoclinic structural distortion develop concomitantly below 12.3 K as second-order-type phase transitions. Coupling between the quadrupolar order and the strain in DyB4 is directly demonstrated by observing that both order parameters are proportional to each other.
Collapse
|
100
|
Ji S, Corredig M, Goff H. WITHDRAWN: Production and functional properties of micellar casein/k-carrageenan aggregates. Int Dairy J 2007. [DOI: 10.1016/j.idairyj.2007.07.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
|