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Ogawa T, Matsumura H, Ishida H, Kogami A, Mizohata E, Makino A, Inoue T, Mae T, Kai Y. Crystal structure of rice rubisco complexed with NADPH. Acta Crystallogr A 2005. [DOI: 10.1107/s0108767305091464] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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Yoshikawa N, Takashima H, Tsukahara K, Kanehisa N, Kai Y. Crystal structure of [RuCl(dpphen)(terpy)]PF 6and [Ru(CH 3CN)(phen)(terpy)](PF 6) 2. Acta Crystallogr A 2005. [DOI: 10.1107/s010876730508712x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
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78
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Kanehisa N, Kai Y. Crystal structure of trimethyltin hydroxide, (CH 3) 3SnOH. Acta Crystallogr A 2005. [DOI: 10.1107/s0108767305087131] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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79
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Yadani T, Kurata S, Matsumura H, Inoue T, Mizohata E, Shimaoka T, Miyake C, Yokota A, Kai Y. Crystal structure of glutathione-dependent dehydroascorbate reductase from spinach chloroplast. Acta Crystallogr A 2005. [DOI: 10.1107/s0108767305091348] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
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80
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Inoue T, Kai Y, Harada S, Kasai N, Ohshiro Y, Suzuki S, Kohzuma T, Tobari J. Refined crystal structure of pseudoazurin from Methylobacterium extorquens AM1 at 1.5 A resolution. ACTA CRYSTALLOGRAPHICA SECTION D: BIOLOGICAL CRYSTALLOGRAPHY 2005; 50:317-28. [PMID: 15299445 DOI: 10.1107/s0907444994000260] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
The crystal structure of pseudoazurin from Methylobacterium extorquens AM1 (PAZAM1) has been solved by the molecular replacement method using copper-copper distances as translation parameters, which were obtained from difference Patterson maps calculated with the synchrotron radiation data containing the multiwavelength anomalous-dispersion effect. The structure refinement was carried out by the use of molecular dynamics optimization and the restrained least-squares method. The final crystallographic R factor was 19.9% for the 14 365 reflections greater than 3sigma between 1.5 and 8.0 A resolution. This report describes the characteristic features of the structure of PAZAM 1 as well as the effectiveness of synchrotron radiation for structure analysis of metalloproteins. The environment of the metal active site and the structural differences among blue-copper proteins are discussed.
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Uchikoshi F, Ito T, Nezu R, Tanemura M, Kai Y, Mizushima T, Nakajima K, Tamagawa H, Matsuda C, Matsuda H. Advantages of laparoscope-assisted surgery for recurrent Crohn's disease. Surg Endosc 2004; 18:1675-9. [PMID: 15931478 DOI: 10.1007/s00464-004-8802-4] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2004] [Accepted: 06/03/2004] [Indexed: 10/26/2022]
Abstract
BACKGROUND Laparoscopic surgery has been applied to patients with primary Crohn's disease, and its beneficial outcomes have been already investigated. However, there is no systematic study of laparoscopic surgery for patients with recurrent diseases. METHODS We performed reoperation for 43 patients with recurrent Crohn's disease, including 23 patients who underwent laparoscope-assisted surgery. RESULTS For all the patients, laparoscope-assisted surgery could be performed safely, even if the patients had been treated previously by open surgery or had undergone multiple abdominal procedures. Conversion to open or hand-assisted laparoscopic surgery was necessary for 16 patients (69.6%) because of dense adhesions (11 cases) or bulky tumor (5 cases). Importantly, even if the procedure was converted, the skin incision was significantly shorter than with open surgery, and postoperative recovery was faster, especially for the patients who underwent conversion to hand-assisted laparoscopic surgery. CONCLUSIONS Laparoscope-assisted surgery is feasible and advantageous in reoperation for patients with recurrent Crohn's disease.
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Kai Y, Hamada JI, Morioka M, Yano S, Ushio Y. Brain stem venous congestion due to dural arteriovenous fistulas of the cavernous sinus. Acta Neurochir (Wien) 2004; 146:1107-11; discussion 1111-2. [PMID: 15744846 DOI: 10.1007/s00701-004-0315-3] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
BACKGROUND Venous congestion of the brain stem due to dural arteriovenous fistulas (DAVFs) in the cavernous sinus is rare and presents therapeutic challenges. To assess the prognosis of patients with symptomatic DAVFs and brain stem dysfunction, we evaluated the degree of venous ischemia by examining pre- and post-treatment magnetic resonance images (MRI) in 2 patients presenting with venous congestion of the brain stem. METHODS A 56-year-old woman with left hemiparesis and a 70-year-old woman with gait disturbance attributable to right cavernous sinus DAVFs were referred to our hospital. In both cases, T2-weighted magnetic resonance imaging (MRI) disclosed a hyperintensity lesion in the brainstem due to venous congestion. FINDINGS Both patients underwent open surgery for direct embolization of the cavernous sinus because there were no approach routes for transvenous embolization. The patient whose pretreatment MRI demonstrated Gd enhancement continued to manifest neurological deficits and persistence of the abnormal hyperintensity on post-treatment T2-weighted MRI. In the other patient whose pretreatment MRI showed no Gd enhancement, treatment produced a complete response of her neurological deficit and disappearance of the abnormal hyperintensity area. CONCLUSIONS We tentatively conclude that lesions corresponding to hyperintensity areas on non-Gd-enhanced, T2-weighted MRI may reflect a reversible condition whereas lesions identified as hyperintense areas on GD-enhanced T2-weighted MRI may be indicative of irreversibility.
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Kazuki Y, Kimura M, Nishigaki R, Kai Y, Abe S, Okita C, Shirayoshi Y, Schulz TC, Tomizuka K, Hanaoka K, Inoue T, Oshimura M. Human chromosome 21q22.2-qter carries a gene(s) responsible for downregulation of mlc2a and PEBP in Down syndrome model mice. Biochem Biophys Res Commun 2004; 317:491-9. [PMID: 15063784 DOI: 10.1016/j.bbrc.2004.03.069] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2004] [Indexed: 11/23/2022]
Abstract
Congenital heart disease (CHD) is a major clinical manifestation of Down syndrome (DS). We recently showed that chimeric mice containing a human chromosome 21 (Chr 21) exhibited phenotypic traits of DS, including CHD. Our previous study showed that myosin light chain-2a (mlc2a) expression was reduced in the hearts of chimeric mice and DS patients. We found that phosphatidylethanolamine binding protein (PEBP) was also downregulated in Chr 21 chimeras in this study. As mlc2a is involved in heart morphogenesis, and PEBP controls the proliferation and differentiation of different cell types, these genes are candidates for involvement in DS-CHD. The DS-CHD candidate region has been suggested to span between PFKL and D21S3, which is the STS marker near the ETS2 loci. To identify gene(s) or a gene cluster on Chr 21 responsible for the downregulation of mlc2a and PEBP, we fragmented Chr 21 at the EST2 loci, by telomere-directed chromosome truncation in homologous recombination-proficient chicken DT40 cells. The modified Chr 21 was transferred to mouse ES cells by microcell-mediated chromosome transfer (MMCT), via CHO cells. We used ES cell lines retaining the Chr 21 truncated at the ETS2 locus (Chr 21E) to produce chimeric mice and compared overall protein expression patterns in hearts of the chimeras containing the intact and the fragmented Chr 21 by two-dimensional electrophoresis. While mouse mlc2a and PEBP expression was downregulated in the chimeras containing the intact Chr 21, the expression was not affected in the Chr 21E chimeras. Therefore, we suggest that Chr 21 gene(s) distal from the ETS2 locus reduce mouse mlc2a and PEBP expression in DS model mice and DS. Thus, this chromosome engineering technology is a useful tool for identification or mapping of genes that contribute to the DS phenotypes.
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Kazuki Y, Schulz TC, Shinohara T, Kadota M, Nishigaki R, Inoue T, Kimura M, Kai Y, Abe S, Shirayoshi Y, Oshimura M. A new mouse model for Down syndrome. ACTA ACUST UNITED AC 2004:1-20. [PMID: 15068235 DOI: 10.1007/978-3-7091-6721-2_1] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/29/2023]
Abstract
Trisomy 21 (Ts21) is the most common live-born human aneuploidy and results in a constellation of features known as Down syndrome (DS). Ts21 is a frequent cause of congenital heart defects and the leading genetic cause of mental retardation. Although overexpression of a gene(s) or gene cluster on human chromosome 21 (Chr 21) or the genome imbalance by Ts21 has been suggested to play a key role in bringing about the diverse DS phenotypes, little is known about the molecular mechanisms underlying the various phenotypes associated with DS. Four approaches have been used to model DS to investigate the gene dosage effects of an extra copy of Chr 21 on various phenotypes; 1) Transgenic mice overexpressing a single gene from Chr 21, 2) YAC/BAC/PAC transgenic mice containing a single gene or genes on Chr 21, 3) Mice with intact/partial trisomy 16, a region with homology to human Chr 21 and 4) Human Chr 21 transchromosomal (Tc) mice. Here we review our new model system for the study of DS using the Tc technology, including the biological effects of an additional Chr 21 in vivo and in vitro.
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Ishiguro K, Toyama J, Shahidul Islam MD, Yoshimoto M, Kumagai T, Kai Y, Nakazawa Y, Yamakawa O. SUIOH, A NEW SWEETPOTATO CULTIVAR FOR UTILIZATION IN VEGETABLE GREENS. ACTA ACUST UNITED AC 2004. [DOI: 10.17660/actahortic.2004.637.42] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Nagano M, Kai Y, Zou B, Hatayama T, Suwa M, Sasaki H, Kumagai S. The contribution of cardiorespiratory fitness and visceral fat to risk factors in Japanese patients with impaired glucose tolerance and type 2 diabetes mellitus. Metabolism 2004; 53:644-9. [PMID: 15131771 DOI: 10.1016/j.metabol.2003.11.023] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
It is still unclear as to how cardiorespiratory fitness and visceral fat accumulation contribute to coronary heart disease (CHD) risk factors in patients with diabetes mellitus. The purpose of the present study was to investigate whether cardiorespiratory fitness contributes to such risk factors independently of visceral fat accumulation. Two hundred Japanese patients (137 men and 63 women, aged 22 to 81 years) with impaired glucose tolerance (IGT) and type 2 diabetes mellitus (type 2 DM) without any intervention and pharmacological therapy participated in a cross-sectional study. The levels of fasting insulin, triglyceride (TG), total cholesterol (TC), high-density lipoprotein cholesterol (HDL-C), and resting blood pressure were assessed. Maximal oxygen uptake (V.o(2max)), an index of cardiorespiratory fitness, was predicted by a graded exercise test using a cycle ergometer. Visceral fat area (VFA) was measured by computed tomography scan. The criteria for abnormalities of the risk factors were determined according to the standard values for Japanese. All subjects were divided equally into the following 3 groups according to their fitness level: low-fit (V.o(2max) < 32 mL/kg/min in men, V.o(2max) < 26 mL/kg/min in women), mid-fit (32 < or = V.o(2max) < 36 in men, 26 < or = V.o(2max) < 30 in women), and high-fit (V.o(2max) > or = 36 in men, V.o(2max) > or = 30 in women). The association between fitness level and the prevalence of abnormal values for these parameters was analyzed by a multiple logistic regression model adjusted for age and VFA. The odds ratio (OR) and 95% confidence interval (CI) for the prevalence of hyperinsulinemia were significantly lower in the mid-fit (OR = 0.35, 95% CI, 0.16 to 0.78) and in the high-fit groups (OR = 0.40, 95% CI, 0.16 to 0.98) compared with the low-fit group. In addition, ORs for the prevalence of low HDL-C in the mid-fit and high-fit groups were significantly lower (OR = 0.35, 95% CI, 0.14 to 0.86; and OR = 0.19; 95% CI, 0.08 to 0.60, respectively) than in the low-fit group. These results suggested that cardiorespiratory fitness might be one of the predictors of metabolic abnormalities, especially in patients with hyperinsulinemia and low HDL-C, independent of visceral fat accumulation in Japanese patients with IGT and type 2 DM.
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Kimura MI, Kazuki Y, Kashiwagi A, Kai Y, Abe S, Barbieri O, Levi G, Oshimura M. Dlx5, the mouse homologue of the human-imprinted DLX5 gene, is biallelically expressed in the mouse brain. J Hum Genet 2004; 49:273-7. [PMID: 15362572 DOI: 10.1007/s10038-004-0139-2] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
The mouse Dlx5 gene encodes a distal-less-related DNA-binding homeobox protein first expressed during early embryonic development in anterior regions of mouse embryo and is located on chromosome 6, which is the syntenic region to the human chromosome 7q21-q31 imprinting cluster. Recently, its human homologue, DLX5, was identified to be imprinted and maternally expressed, at least in normal human lymphoblasts and in brain tissues. In our study, we analyzed the imprinting status of mouse Dlx5 by RT-PCR, first in the F1 of a reciprocal cross between two different mouse strains, and second in heterozygous Dlx5 mutant mice. Both approaches revealed that mouse Dlx5 followed a biallelic pattern of expression in brain tissue and in testis. Our findings suggest that the Dlx5 gene escapes genomic imprinting, at least in mice of certain genetic backgrounds.
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Hu J, Chen Z, Gorczynski CP, Gorczynski LY, Kai Y, Lee L, Manuel J, Gorczynski RM. Sleep-deprived mice show altered cytokine production manifest by perturbations in serum IL-1ra, TNFa, and IL-6 levels. Brain Behav Immun 2003; 17:498-504. [PMID: 14583241 DOI: 10.1016/j.bbi.2003.03.001] [Citation(s) in RCA: 65] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
Serum cytokine and chemokine levels were examined in mice following 36 h of sleep deprivation, or after exposure to a known physical stressor (rotational stress). Significant changes in inflammatory cytokines/chemokines (IL-1beta, TNFalpha, IL-1ra, IL-6, and MIP-1beta, MCP-1) were observed following each manipulation, but qualitative and quantitative differences were seen. Interestingly, only physical stress was associated with measured increases in serum corticosterone levels, and with independent evidence (using in vitro immune allostimulation) for a generalized immunosuppression secondary to the experimental manipulation. Our data suggest that altered cytokine production following sleep perturbation occurs by a different mechanism from that (HPA axis) commonly attributed to stress per se.
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Hu ΖG, Maramatsu Κ, Kanehisa Ν, Yoshimura M, Mori Y, Sasaki T, Kai Y. Reinvestigation of the crystal structure of barium aluminum borate difluoride, BaAlBO3F2, a new nonlinear optical material. Z KRIST-NEW CRYST ST 2003. [DOI: 10.1524/ncrs.2003.218.jg.1] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Inaki Y, Mochizuki E, Tohnai N, Yasui N, Miyata M, Kai Y. Structure and photodimerizations of 1-alkylthymines in single crystals. NUCLEIC ACIDS SYMPOSIUM SERIES 2003:233-4. [PMID: 12903354 DOI: 10.1093/nass/44.1.233] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
1-Alkylthymine gave four kinds of crystals depending on the solvents used. Photodimerizations of 1-alkylthymine in single crystals were found to depend on the crystal structure. In inactive crystals, the terminal methyl group of alkyl chains approached to the double bond of thymine, and inhibited rotation of thymine bases during photodimerization.
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Kai Y, Hamada JI, Morioka M, Todaka T, Mizuno T, Ushio Y. Endovascular coil trapping for ruptured vertebral artery dissecting aneurysms by using double microcatheters technique in the acute stage. Acta Neurochir (Wien) 2003; 145:447-51; discussion 451. [PMID: 12836068 DOI: 10.1007/s00701-003-0012-7] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
BACKGROUND In the treatment of vertebral artery (VA) dissecting aneurysms, only proximal occlusion of the VA does not necessarily prevent rerupture. We evaluated the efficacy of coil trapping for the ruptured VA dissecting aneurysms using the double microcatheters technique. METHODS We treated 11 patients who presented with subarachnoid haemorrhage (SAH) due to rupture of a VA dissecting aneurysm which did not involve the posterior inferior cerebellar artery at the site of dissection. All patients tolerated the balloon occlusion test. Within 3 days of the SAH, the dissection site was trapped with a Guglielmi detachable coil (GDC) using the double microcatheters technique. The proximal and distal sites of the dissecting aneurysm were embolized simultaneously. FINDINGS GDC trapping at the affected site was successful in all 11 patients. Radiographic findings showed complete occlusion of the dissection site and patency of the unaffected artery. Although one patient experienced transient dysphagia, there were no major complications. INTERPRETATION The double microcatheters technique is effective for coil trapping of ruptured VA dissecting aneurysms in selected patients. The risks posed by this simple technique are minimal, even in the acute stage.
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Hu ZG, Maramatsu K, Kanehisa N, Sasaki T, Kai Y. Reinvestigation of the crystal structure of barium aluminum borate difluoride, BaAlBO3F2, a new nonlinear optical material. Z KRIST-NEW CRYST ST 2003. [DOI: 10.1524/ncrs.2003.218.1.1] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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93
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Erwanto Y, Kawahara S, Katayama K, Takenoyama S, Fujino H, Yamauchi K, Morishita T, Kai Y, Watanabe S, Muguruma M. Microbial Transglutaminase Modifies Gel Properties of Porcine Collagen. ASIAN-AUSTRALASIAN JOURNAL OF ANIMAL SCIENCES 2003. [DOI: 10.5713/ajas.2003.269] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Kumagai S, Kai Y, Hanada H, Uezono K, Sasaki H. Relationships of the systolic blood pressure response during exercise with insulin resistance, obesity, and endurance fitness in men with type 2 diabetes mellitus. Metabolism 2002; 51:1247-52. [PMID: 12370842 DOI: 10.1053/meta.2002.35180] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
The purpose of the present study was to investigate the relationships among the resting systolic (SBP) and diastolic blood pressure (DBP) or SBP response during exercise with insulin resistance evaluated by a homeostasis model (HOMA-IR), abdominal fat accumulation (visceral fat area [VFA], subcutaneous fat area [SFA]) by computed tomography (CT), and an estimation of the maximal oxygen uptake (V*O2max) in 63 Japanese middle-aged male patients with type 2 diabetes mellitus (type 2 DM). Body mass index (BMI) and waist-to-hip ratio (WHR) in type 2 DM subjects were significantly higher than in age-matched healthy male control subjects (n = 135) with normal glucose tolerance. Resting SBP (127.7 +/- 16.2 mm Hg v 119.4 +/- 13.0 mm Hg) and DBP (82.2 +/- 11.9mmHg v 76.8 +/- 9.4 mm Hg) levels, and the percentage of hypertension (20.6% v 1.5%) in type 2 DM subjects were significantly higher than in the control subjects (P <.05). According to a multiple regression analysis for resting blood pressure in type 2 DM, VFA was found to be an independent predictor of SBP, while V*O2max and HOMA-IR were independent predictors of DBP. In the controls, however, HOMA-IR was not found to be a significantly independent predictor for either resting SBP or resting DBP. Measurement of the SBP response during graded exercise using a ramp test was performed by an electrical braked cycle ergometer in 54 patients with type 2 DM only. The SBP was measured at 15-second intervals during exercise. The exercise intensity at the double product breaking point (DPBP), which strongly correlated with the exercise intensity at the lactate threshold, was used as an index for the SBP response to standardized exercise intensity. The SBP corresponding to exercise intensity at DPBP (SBP@DPBP) was evaluated as an index of the SBP response to standardized exercise intensity. The change in SBP (deltaSBP = SBP@DPBP - resting SBP) was significantly and positively associated with log area under the curve for glucose (log AUCPG) during a 75-g oral glucose tolerance test (OGTT). In addition, deltaSBP significantly and negatively correlated with the log area under the curve for insulin (log AUCIRI) and log AUCIRI/log AUCPG. Based on these results, insulin resistance was suggested to be independently associated with the resting DBP and SBP response to standardized exercise intensity in type 2 DM patients.
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Okano Y, Inoue T, Kubata BK, Kabututu Z, Munday CJ, Urade Y, Kai Y. Crystallization and preliminary X-ray diffraction analysis of prostaglandin F 2αsynthase from Trypanosoma brucei. Acta Crystallogr A 2002. [DOI: 10.1107/s0108767302088736] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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Kai Y, Matsumura H, Shirakata S, Inoue T, Yoshinaga T, Ueno Y, Izui K. Crystal structure of phosphoenolpyruvate carboxylase: the reaction mechanism and regulation. Acta Crystallogr A 2002. [DOI: 10.1107/s0108767302089134] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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97
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Mizohata E, Okano Y, Xie Y, Matsumura H, Sugawara H, Inoue T, Yokota A, Kai Y. Crystal structure of GaldieriaRubisco reveals a novel closure mechanism of the active site. Acta Crystallogr A 2002. [DOI: 10.1107/s010876730208933x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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98
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Matsumura H, Takahashi H, Hashimoto H, Nishioka M, Fujiwara S, Takagi M, Imanaka T, Inoue T, Kai Y. Crystal structure of intein homing endonuclease II encoded in the Archaeal DNA polymerase gene. Acta Crystallogr A 2002. [DOI: 10.1107/s0108767302095958] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
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99
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Kanehisa N, Xie Y, Nagai E, Fujii M, Nakao Y, Kai Y. Two dinuclear nickel complexes with different N 3ligand binding type. Acta Crystallogr A 2002. [DOI: 10.1107/s0108767302090293] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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Gorczynski RM, Hu J, Chen Z, Kai Y, Lei J. A CD200FC immunoadhesin prolongs rat islet xenograft survival in mice. Transplantation 2002; 73:1948-53. [PMID: 12131694 DOI: 10.1097/00007890-200206270-00018] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
BACKGROUND A solubilized form of the CD200 molecule, CD200Fc, has been shown to suppress allograft rejection and development of collagen-induced arthritis in mice. We investigated whether the same molecule could prolong survival of rat islet xenografts. METHODS Streptozocin-treated mice, receiving injections with anti-asialo-GM1 antibody, received rat islets ( approximately 400/mouse) under the kidney capsule or injected into the portal vein, along with rapamycin treatment. Thereafter mice received injections of CD200Fc (10 microg/mouse/injection) or control mouse IgG2. Blood glucose was monitored daily. Some mice received additional injections of anti-CD200/-CD200R monoclonal antibodies. RESULTS Portal vein delivery of islets led to more extended resolution of diabetes than did transplantation under the kidney capsule. CD200Fc further prolonged survival in either case, an effect abolished by anti-CD200 or F(ab')2 anti-CD200R mAbs, but not by whole anti-CD200R (anti-CD200R Ig). Spleen cells taken from CD200Fc-treated mice showed polarization to type-2 cytokine production (interleukin-4, interleukin-10) on restimulation with rat splenocytes in culture, in comparison to cells from control mice (type-1 cytokines, interlulin-2, interferon-gamma). CONCLUSION CD200:CD200R interactions are important in regulating rat islet xenograft survival.
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