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Oddon F, Chiba Y, Nakazawa J, Ohta T, Ogura T, Hikichi S. Characterization of Mononuclear Non-heme Iron(III)-Superoxo Complex with a Five-Azole Ligand Set. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201502367] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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Oddon F, Chiba Y, Nakazawa J, Ohta T, Ogura T, Hikichi S. Characterization of Mononuclear Non-heme Iron(III)-Superoxo Complex with a Five-Azole Ligand Set. Angew Chem Int Ed Engl 2015; 54:7336-9. [DOI: 10.1002/anie.201502367] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2015] [Indexed: 12/25/2022]
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Tsuruta T, Yamazaki T, Watanabe K, Chiba Y, Yoshida A, Naito S, Nakazawa J, Hikichi S. Mimicking the Active Sites of Non-heme Iron Oxygenases on the Solid Supports of Catalysts: Formation of Immobilized Iron Complexes with Imidazolyl and Carboxylate Ligands. CHEM LETT 2015. [DOI: 10.1246/cl.140937] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Araki H, Ono S, Nishizawa Y, Deji N, Nakazawa J, Morita Y, Kume S, Chin-Kanasaki M, Isshiki K, Araki SI, Arimura T, Maegawa H, Uzu T. Focal Segmental Glomerular Sclerosis Ameliorated by Long-term Hemodialysis Therapy with Low-density Lipoprotein Apheresis. Intern Med 2015; 54:2213-7. [PMID: 26328649 DOI: 10.2169/internalmedicine.54.4631] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
We report a case involving a 43-year-old Japanese woman with steroid-resistant focal segmental glomerular sclerosis (FSGS) and severe renal dysfunction, which was ameliorated by low-density lipoprotein apheresis (LDL-A). She had been treated with steroid therapy, but had experienced anuria for over 10 weeks and required hemodialysis. She was then treated with LDL-A, which resulted in improved urinary protein excretion and renal function. Her renal function recovered after 97 days of hemodialysis therapy. This case suggests that LDL-A may represent an effective rescue treatment in patients with FSGS and long-term anuria.
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Esposito G, Nakazawa J, Ogawa S, Stival R, Kawashima A, Putnick DL, Bornstein MH. Baby, you light-up my face: culture-general physiological responses to infants and culture-specific cognitive judgements of adults. PLoS One 2014; 9:e106705. [PMID: 25353362 PMCID: PMC4212966 DOI: 10.1371/journal.pone.0106705] [Citation(s) in RCA: 65] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2014] [Accepted: 07/31/2014] [Indexed: 11/18/2022] Open
Abstract
Infants universally elicit in adults a set of solicitous behaviors that are evolutionarily important for the survival of the species. However, exposure, experience, and prejudice appear to govern adults' social choice and ingroup attitudes towards other adults. In the current study, physiological arousal and behavioral judgments were assessed while adults processed unfamiliar infant and adult faces of ingroup vs. outgroup members in two contrasting cultures, Japan and Italy. Physiological arousal was investigated using the novel technique of infrared thermography and behavioral judgments using ratings. We uncovered a dissociation between physiological and behavioral responses. At the physiological level, both Japanese and Italian adults showed significant activation (increase of facial temperature) for both ingroup and outgroup infant faces. At the behavioral level, both Japanese and Italian adults showed significant preferences for ingroup adults. Arousal responses to infants appear to be mediated by the autonomic nervous system and are not dependent on direct caregiving exposure, but behavioral responses appear to be mediated by higher-order cognitive processing based on social acceptance and cultural exposure.
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Esposito G, Nakazawa J, Venuti P, Bornstein MH. Judgment of infant cry: The roles of acoustic characteristics and sociodemographic characteristics. JAPANESE PSYCHOLOGICAL RESEARCH 2014; 57:126-134. [PMID: 29681650 DOI: 10.1111/jpr.12072] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Adult judgments of infant cry are determined by both acoustic properties of the cry and listener sociodemographic characteristics. The main purpose of this research was to investigate how these two sources shape adult judgments of infant cry. We systematically manipulated both the acoustic properties of infant cries and contrasted listener sociodemographic characteristics. Then, we asked participants to listen to several acoustic manipulations of infant cries and to judge the level of distress the infant was expressing and the level of distress participants felt when listening. Finally, as a contrasting condition, participants estimated the age of the crying infant. Using tree-based models, we found that judgments of the level of distress the infant was expressing as well as the level of distress listeners felt are mainly accounted for by select acoustic properties of infant cry (proportion of sound/pause, fundamental frequency, and number of utterances), whereas age estimates of a crying infant are determined mainly by listener sociodemographic characteristics (gender and parental status). Implications for understanding infant cry and its effects as well as early caregiver-infant interactions are discussed.
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Esposito G, Nakazawa J, Ogawa S, Stival R, Putnick DL, Bornstein MH. Using Infrared Thermography to Assess Emotional Responses to Infants. EARLY CHILD DEVELOPMENT AND CARE 2014; 185:438-447. [PMID: 29527089 PMCID: PMC5844285 DOI: 10.1080/03004430.2014.932153] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Adult-infant interactions operate simultaneously across multiple domains and at multiple levels - from physiology to behavior. Unpackaging and understanding them, therefore, involves analysis of multiple data streams. In this study, we tested physiological responses and cognitive preferences for infant and adult faces in adult females and males. Infrared thermography was used to assess facial temperature changes as a measure of emotional valence, and we used a behavioral rating system to assess adults' expressed preferences. We found greater physiological activation in response to infant stimuli in females than males. As for cognitive preferences, we found greater responses to adult stimuli than to infant stimuli, both in males and females. The results are discuss in light of the Life History Theory. Finally, we discuss the importance of integrating the two data streams on our conclusions.
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Sugimoto T, Soumura M, Danno K, Kaji K, Kondo M, Hirata K, Nakazawa J, Uzu T, Nishio Y, Kashiwagi A. Scleroderma renal crisis in a patient with anticentromere antibody-positive limited cutaneous systemic sclerosis. Mod Rheumatol 2014. [DOI: 10.3109/s10165-006-0504-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Nakazawa J, Yata A, Hori T, Stack TDP, Naruta Y, Hikichi S. Catalytic Alkane Oxidation by Homogeneous and Silica-supported Cobalt(II) Complex Catalysts with a Triazolyl Group-containing Tetradentate Ligand. CHEM LETT 2013. [DOI: 10.1246/cl.130464] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Hashimoto Y, Itagaki Y, Sugahara S, Niimi M, Nakazawa J, Takaya K, Ishii M, Kamiuchi K, Isono M. A case of diabetic ketoacidosis complicated by fatal acute abdominal aortic thrombosis. Diabetol Int 2013. [DOI: 10.1007/s13340-013-0115-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Esposito G, Nakazawa J, Venuti P, Bornstein MH. Componential deconstruction of infant distress vocalizations via tree-based models: a study of cry in autism spectrum disorder and typical development. RESEARCH IN DEVELOPMENTAL DISABILITIES 2013; 34:2717-24. [PMID: 23774058 PMCID: PMC3741341 DOI: 10.1016/j.ridd.2013.05.036] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/06/2013] [Revised: 05/15/2013] [Accepted: 05/21/2013] [Indexed: 05/31/2023]
Abstract
Understanding early episodes of cry is essential to improve caregiver-child interaction and child well-being. Caregiver perceptions of cry are based on interpretations of different acoustic characteristics of the cry, including the length of the pauses, the number of utterances, and the fundamental frequency. In this study, we used tree-based models to establish a hierarchy of effect in terms of how these acoustic characteristics influence perceptions of cries of children with autism compared to cries of typically developing children. In two studies, one in Italy and the other in Japan, we found that cries of children with autism are perceived more negatively. We also found that the length of the pauses, more than the number of utterances or fundamental frequency, determines listeners' negative perceptions. Implications for early caregiver-child interactions are discussed.
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Nakazawa J, Terada S, Yamada M, Hikichi S. Structural Characterization and Oxidation Reactivity of a Nickel(II) Acylperoxo Complex. J Am Chem Soc 2013; 135:6010-3. [DOI: 10.1021/ja4020277] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Nakazawa J, Hori T, Stack TDP, Hikichi S. Alkane Oxidation by an Immobilized Nickel Complex Catalyst: Structural and Reactivity Differences Induced by Surface-Ligand Density on Mesoporous Silica. Chem Asian J 2013; 8:1191-9. [DOI: 10.1002/asia.201300165] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2013] [Indexed: 11/06/2022]
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Komatsuzaki H, Shiota A, Hazawa S, Itoh M, Miyamura N, Miki N, Takano Y, Nakazawa J, Inagaki A, Akita M, Hikichi S. Manganese(II) semiquinonato and manganese(III) catecholato complexes with tridentate ligand: modeling the substrate-binding state of manganese-dependent catechol dioxygenase and reactivity with molecular oxygen. Chem Asian J 2013; 8:1115-9. [PMID: 23512755 DOI: 10.1002/asia.201300029] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2013] [Revised: 02/19/2013] [Indexed: 11/06/2022]
Abstract
Catecholate catwalk: Monomeric manganese(III) catecholato and manganese(II) semiquinonato complexes as the substrate-binding model of catechol dioxygenase have been synthesized and structurally characterized. The semiquinonato complex reacted with molecular oxygen to give ring-cleaved products and benzoquinone in the catalytic condition.
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Enomoto J, Nakazawa J, Mizuno Y, Shirai T, Ogawa J, Niwa K. Psychosocial Factors Influencing Mental Health in Adults With Congenital Heart Disease. Circ J 2013; 77:749-55. [DOI: 10.1253/circj.cj-12-0716] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Hikichi S, Hanaue K, Fujimura T, Okuda H, Nakazawa J, Ohzu Y, Kobayashi C, Akita M. Characterization of nickel(ii)-acylperoxo species relevant to catalytic alkanehydroxylation by nickel complex with mCPBA. Dalton Trans 2013; 42:3346-56. [DOI: 10.1039/c2dt32419a] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
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Ikeda A, Hoshino K, Komatsuzaki H, Satoh M, Nakazawa J, Hikichi S. O2 activation and external substrate oxidation capability of a Co(ii)–semiquinonato complex. NEW J CHEM 2013. [DOI: 10.1039/c3nj00215b] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Nakazawa J, Hagiwara J, Shimazaki Y, Tani F, Naruta Y. Synthesis, Characterization, and Small Hydrocarbon Encapsulation of Dicavitand-Porphyrins. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2012. [DOI: 10.1246/bcsj.20120107] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Esposito G, Nakazawa J, Venuti P, Bornstein MH. Perceptions of distress in young children with autism compared to typically developing children: a cultural comparison between Japan and Italy. RESEARCH IN DEVELOPMENTAL DISABILITIES 2012; 33:1059-67. [PMID: 22502830 PMCID: PMC3328100 DOI: 10.1016/j.ridd.2012.01.014] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/23/2011] [Revised: 01/25/2012] [Accepted: 01/25/2012] [Indexed: 05/14/2023]
Abstract
This study investigates how adults in two contrasting cultures (Italian and Japanese) perceive episodes of crying of typically developing (TD) children and children with Autism Disorder (AD). Although cries of children with AD have been reported to elicit more distress in Western cultures, it is not known whether similar findings hold in Eastern cultures. In Experiment 1, we artificially modified structural parameters (fundamental frequency, duration of pauses, waveform modulation) of cries and asked Italian and Japanese adults to judge levels of expressed and felt distress in the cries. In Experiment 2, we asked Italian and Japanese adults to report these levels of distress on hearing cries of AD and TD children. In both cultures, cries with higher fundamental frequency and shorter pause durations were judged more distressing and distressed and observers perceived cries of children with AD as more distressing and distressed than cries of TD children. The similar responses in adults from two contrasting societies constitute evidence that reactions to cries of children with AD might be universal.
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Ono H, Nishijima Y, Adachi N, Sakamoto M, Kudo Y, Nakazawa J, Kaneko K, Nakao A. Hydrogen(H2) treatment for acute erythymatous skin diseases. A report of 4 patients with safety data and a non-controlled feasibility study with H2 concentration measurement on two volunteers. Med Gas Res 2012; 2:14. [PMID: 22607973 PMCID: PMC3407032 DOI: 10.1186/2045-9912-2-14] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2011] [Accepted: 05/20/2012] [Indexed: 11/10/2022] Open
Abstract
Background We have treated 4 patients of acute erythematous skin diseases with fever and/or pain by H2 enriched intravenous fluid. We also added data from two volunteers for assessing the mode of H2 delivery to the skin for evaluation of feasibility of H2 treatment for this type of skin diseases. Methods All of the four patients received intravenous administration of 500 ml of H2 enriched fluid in 30 min for more than 3 days except in one patient for only once. From two volunteers (one for intravenous H2 administration and the other for H2 inhalation), blood samples were withdrawn serially and air samples were collected from a heavy duty plastic bag covering a leg, before, during and after H2 administration. These samples were checked for H2 concentration immediately by gas chromatography. Multiple physiological parameters and blood chemistry data were collected also. Results Erythema of these 4 patients and associated symptoms improved significantly after the H2 treatment and did not recur. Administration of H2 did not change physiological parameters and did not cause deterioration of the blood chemistry. The H2 concentration in the blood from the volunteers rapidly increased with H2 inhalation and slowly decreased with cessation of H2 particularly in the venous blood, while H2 concentration of the air from the surface of the leg showed much slower changes even after H2 inhalation was discontinued, at least during the time of sample collection. Conclusion An improvement in acute erythemtous skin diseases followed the administration of H2 enriched fluid without compromising the safety. The H2 delivery study of two volunteers suggested initial direct delivery and additional prolonged delivery possibly from a slowly desaturating reservoir in the skin to the surface.
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Nakazawa J, Smith BJ, Stack TDP. Discrete complexes immobilized onto click-SBA-15 silica: controllable loadings and the impact of surface coverage on catalysis. J Am Chem Soc 2012; 134:2750-9. [PMID: 22277027 DOI: 10.1021/ja210400u] [Citation(s) in RCA: 103] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Azidopropyl functionalized mesoporous silica SBA-15 were prepared with variable azide loadings of 0.03-0.7 mmol g(-1) (~2-50% of maximal surface coverage) through a direct synthesis, co-condensation approach. These materials are functionalized selectively with ethynylated organic moieties through a copper-catalyzed azide alkyne cycloaddition (CuAAC) or "click" reaction. Specific loading within a material can be regulated by either the azide loading or limiting the alkyne reagent relative to the azide loading. The immobilization of ferrocene, pyrene, tris(pyridylmethyl)amine (TPA), and iron porphyrin (FeTPP) demonstrates the robust nature and reproducibility of this two-step synthetic attachment strategy. Loading-sensitive pyrene fluorescence correlates with a theoretically random surface distribution, rather than a uniform one; site-isolation of tethered moieties ~15 Å in length occurs at loadings less than 0.02 mmol g(-1). The effect of surface loading on reactivity is observed in the oxygenation of SBA-15-[Cu(I)(TPA)]. SBA-15-[Mn(II)(TPA)]-catalyzed epoxidation exhibits a systematic dependence on surface loading. A comparison of homogeneous, site-isolated and site-dense complexes provides insight into catalyst speciation and ligand activity.
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Nakazawa J, Ogiwara H, Kashiwazaki Y, Ishii A, Imamura N, Samejima Y, Hikichi S. Dioxygen activation and substrate oxygenation by a p-nitrothiophenolatonickel complex: unique effects of an acetonitrile solvent and the p-nitro group of the ligand. Inorg Chem 2011; 50:9933-5. [PMID: 21916455 DOI: 10.1021/ic201555f] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
The nickel(II) complex [Ni(Tp(Me2)) (SC(6)H(4)NO(2))] [1a; Tp(Me2) = hydrotris(3,5-dimethylpyrazol-1-yl)borate] reacts with O(2) to form the ligand oxygenation product ArSO(2)(-) in MeCN, and also 1a catalyzes the oxygenation of external substrates such as triphenylphosphine. The reactivity may correlate to the unique quinoid-like resonance structure of the thiophenolate ligand. The structure is stabilized by a p-nitro group and induced by coordination of MeCN.
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Ono H, Nishijima Y, Adachi N, Tachibana S, Chitoku S, Mukaihara S, Sakamoto M, Kudo Y, Nakazawa J, Kaneko K, Nawashiro H. Improved brain MRI indices in the acute brain stem infarct sites treated with hydroxyl radical scavengers, Edaravone and hydrogen, as compared to Edaravone alone. A non-controlled study. Med Gas Res 2011; 1:12. [PMID: 22146068 PMCID: PMC3231971 DOI: 10.1186/2045-9912-1-12] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2011] [Accepted: 06/07/2011] [Indexed: 12/24/2022] Open
Abstract
BACKGROUND In acute stage of cerebral infarction, MRI indices (rDWI & rADC) deteriorate during the first 3-7 days after the ictus and then gradually normalize in approximately 10 days (pseudonormalization time), although the tissue is already infarcted. Since effective treatments improve these indices significantly and in less than the natural pseudonormalization time, a combined analysis of these changes provides an opportunity for objective evaluation on the effectiveness of various treatments for cerebral infarction. Hydroxyl radicals are highly destructive to the tissue and aggravate cerebral infarction. We treated brainstem infarction patients in acute stage with hydroxyl radical scavengers (Edaravone and hydrogen) by intravenous administration and evaluated the effects of the treatment by a serial observation and analysis of these MRI indices. The effects of the treatment were evaluated and compared in two groups, an Edaravone alone group and a combined group with Edaravone and hydrogen, in order to assess beneficial effects of addition of hydrogen. METHODS The patients were divided in Edaravone only group (E group. 26 patients) and combined treatment group with Edaravone and hydrogen enriched saline (EH group. 8 patients). The extent of the initial hump of rDWI, the initial dip of rADC and pseudo-normalization time were determined in each patient serially and averages of these data were compared in these two groups and also with the natural course in the literatures. RESULTS The initial hump of rDWI reached 2.0 in the E group which was better than 2.5 of the natural course but was not as good as 1.5 of the EH group. The initial dip of rADC was 0.6 in the E group which was close to the natural course but worse than 0.8 of the EH group. Pseudonormalization time of rDWI and rADC was 9 days only in EH group but longer in other groups. Addition of hydrogen caused no side effects. CONCLUSIONS Administration of hydroxyl radical scavengers in acute stage of brainstem infarction improved MRI indices against the natural course. The effects were more obvious and significant in the EH group. These findings may imply the need for more frequent daily administration of hydroxyl scavenger, or possible additional hydrogen effects on scavenger mechanisms.
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Hikichi S, Fujita K, Manabe Y, Akita M, Nakazawa J, Komatsuzaki H. Coordination Properties of Organoborate Ligands - Steric Hindrance Around the Distal Boron Center Directs the Conformation of the Dialkylbis(imidazolyl)borate Scaffold. Eur J Inorg Chem 2010. [DOI: 10.1002/ejic.201000629] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Nakazawa J, Isshiki K, Sugimoto T, Araki SI, Kume S, Yokomaku Y, Chin-Kanasaki M, Sakaguchi M, Koya D, Haneda M, Kashiwagi A, Uzu T. Renoprotective effects of asialoerythropoietin in diabetic mice against ischaemia-reperfusion-induced acute kidney injury. Nephrology (Carlton) 2010; 15:93-101. [PMID: 20377776 DOI: 10.1111/j.1440-1797.2009.01170.x] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
AIM Diabetic patients are at higher risk of failure to recover after acute kidney injury, however, the mechanism and therapeutic strategies remain unclear. Erythropoietin is cytoprotective in a variety of non-haematopoietic cells. The aim of the present study was to clarify the mechanism of diabetes-related acceleration of renal damage after ischaemia-reperfusion injury and to examine the therapeutic potential of asialoerythropoietin, a non-haematopoietic erythropoietin derivative, against ischaemia-reperfusion-induced acute kidney injury in diabetic mice. METHODS C57BL/6J mice with and without streptozotocin-induced diabetes were subjected to 30 min unilateral renal ischaemia-reperfusion injury at 1 week after induction of diabetes. They were divided into four group: (i) non-diabetic plus ischaemia-reperfusion injury; (ii) non-diabetic plus ischaemia-reperfusion injury plus asialoerythropoietin (3000 IU/kg bodyweight); (iii) diabetic plus ischaemia-reperfusion injury; and (iv) diabetic plus ischemia-reperfusion injury plus asialoerythropoietin. Experiments were conducted at the indicated time periods after ischaemia-reperfusion injury. RESULTS Ischaemia-reperfusion injury of diabetic kidney resulted in significantly low protein expression levels of bcl-2, an anti-apoptotic molecule, and bone morphogenetic protein-7 (BMP-7), an anti-fibrotic and pro-regenerative factor, compared with non-diabetic kidneys. Diabetic kidney subsequently showed severe damage including increased tubular cell apoptosis, tubulointerstitial fibrosis and decreased tubular proliferation, compared with non-diabetic kidney. Treatment with asialoerythropoietin induced bcl-2 and BMP-7 expression in diabetic kidney and decreased tubular cell apoptosis, tubulointerstitial fibrosis and accelerated tubular proliferation. CONCLUSION Reduced induction bcl-2 and BMP-7 may play a role in the acceleration of renal damage after ischaemia-reperfusion injury in diabetic kidney. The renoprotective effects of asialoerythropoietin on acute kidney injury may be mediated through the induction of bcl-2 and BMP-7.
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