Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 20 de 349
Filtrar
Mais filtros

Base de dados
País/Região como assunto
Tipo de documento
Intervalo de ano de publicação
1.
Annu Rev Immunol ; 29: 45-69, 2011.
Artigo em Inglês | MEDLINE | ID: mdl-21166539

RESUMO

Basophils are the rarest granulocytes and represent less than 1% of peripheral blood leukocytes. They are evolutionarily conserved in many animal species, but their functional significance remained an enigma long after their discovery by Paul Ehrlich in 1879. Studies of basophils were hindered by their rarity, by difficulties in identifying them, and by the paucity of useful analytical tools. Because basophils display several characteristics shared by tissue-resident mast cells, they were often considered minor and possibly redundant relatives of mast cells or even blood-circulating precursors of mast cells. However, newly developed tools for their functional analysis, including basophil-depleting antibodies and genetically engineered mice deficient only in basophils, have fueled basophil research and defined previously unrecognized functions of basophils. We now appreciate that basophils play nonredundant roles in acquired immunity regulation, protective immunity to pathogens, and immunological disorders such as allergy and autoimmunity.


Assuntos
Basófilos/imunologia , Animais , Humanos , Doenças do Sistema Imunitário/imunologia , Doenças do Sistema Imunitário/patologia , Ativação Linfocitária , Células Th2/citologia
2.
Chemistry ; : e202401226, 2024 Jul 18.
Artigo em Inglês | MEDLINE | ID: mdl-39023079

RESUMO

Lipophosphoglycans (LPGs) are found on the surface of Leishmania, a protozoan parasite, and are immunologically important. Herein, disaccharide 1-phosphate repeating units of LPGs were successfully synthesized on a solid support with high anomeric purity using a disaccharide α-1-phosphoramidite building block. To enhance solubility in the reaction solvent, hydroxy-protecting groups in the form of para-t-butylbenzoyl were introduced to the building block. The saccharide chain was elongated via stable glycosyl boranophosphate linkages, followed by the conversion of inter-sugar linkages to phosphodiester counterparts using an oxaziridine derivative. The addition of a silylating reagent post-reaction with the oxaziridine derivative efficiently facilitated the conversion of boranophosohodiesters to phosphodiesters. This method enabled the α-selective synthesis of up to 15 repeating units, marking the longest homogeneous repeating units of LPGs  synthesized chemically.  Given the chain length equivalence to native LPGs, the method developed herein holds promise for advancing anti-Leishmanial pharmaceuticals and vaccines.

3.
Thromb J ; 22(1): 10, 2024 Jan 15.
Artigo em Inglês | MEDLINE | ID: mdl-38225597

RESUMO

BACKGROUND: Disseminated intravascular coagulation (DIC) syndrome is a highly lethal condition characterized by the complication of multiple organ damage. Although the effects of combined antithrombin (AT) and recombinant thrombomodulin (rTM) on DIC syndrome have previously been examined, the results are inconsistent and inconclusive. Therefore, we conducted a systematic review on the combined administration of AT and rTM for the treatment of septic DIC to investigate the superiority of the combination therapy over either AT or rTM monotherapy using a random-effects analysis model. METHOD: We searched electronic databases, including Medline, Cochrane Central Register of Controlled Trials, Scopus, and Igaku-Chuo Zasshi (ICHU-SHI) Japanese Central Review of Medicine Web from inception to January 2022. Studies assessing the efficacy of combined AT and rTM were included. The primary outcome was all-cause mortality, and the secondary outcome was occurrence of serious bleeding complications compared to monotherapy. We presented the pooled odds ratio (OR) or hazard ratio (HR) with 95% confidence intervals (CI) depending on reporting results in each primary study. RESULTS: We analyzed seven enrolled clinical trials, all of which were observational studies. Combination therapy had a non-significant favorable association with lower 28-day mortality compared to monotherapy (HR 0.67 [0.43-1.05], OR 0.73 [0.45-1.18]). The I2 values were 60% and 72%, respectively, suggesting high heterogeneity. As a secondary outcome, bleeding complications were similar between the two groups (pooled OR 1.11 [0.55-2.23], I2 value 55%). CONCLUSIONS: Although the findings in this analysis could not confirm a statistically significant effect of AT and rTM combination therapy for septic DIC, it showed a promising effect in terms of improving mortality. The incidence of bleeding was low and clinically feasible. Further research is warranted to draw more conclusive results. TRIAL REGISTRATION: This study was registered in the University Hospital Medical Information Network (UMIN) Clinical Trials Registry (UMIN ID: 000049820).

4.
J Org Chem ; 88(15): 10617-10631, 2023 08 04.
Artigo em Inglês | MEDLINE | ID: mdl-37462534

RESUMO

In this study, we successfully synthesized several kinds of P-modified nucleic acids from boranophosphate DNAs via an acyl phosphite intermediate in solution and on a solid support. In the solution-phase synthesis, phosphorothioate diester, phosphotriester, and phosphoramidate diester were synthesized in a one-pot reaction from boranophosphodiester via the conversion of an acyl phosphite as a key intermediate. In addition, doubly P-modified nucleic acid derivatives which were difficult to synthesize by the phosphoramidite and H-phosphonate methods were also obtained by the conversion reaction. In the solid-phase synthesis, a boranophosphate derivative was synthesized on a solid support using the H-boranophosphonate method. Then, an acyl phosphite intermediate was formed by treatment with pivaloyl chloride in pyridine, followed by appropriate transformations to obtain the P-modified derivatives such as phosphotriester and phosphorothioate diester. Notably, it was suggested that the conversion reaction of a boranophosphate to a phosphorothioate diester proceeded with retention of the stereochemistry of the phosphorous center. In addition, a phosphorothioate/phosphate chimeric dodecamer was successfully synthesized from a boranophosphate/phosphate chimeric dodecamer using the same strategy. Therefore, boranophosphate derivatives are versatile precursors for the synthesis of P-modified DNA, including chimeric derivatives.


Assuntos
Fosfitos , Fosfatos , DNA
5.
Org Biomol Chem ; 21(12): 2486-2492, 2023 03 22.
Artigo em Inglês | MEDLINE | ID: mdl-36688350

RESUMO

In this study, we developed a new approach for the solution-phase synthesis of oligodeoxynucleotides (ODNs) using nucleoside 3'-H-phosphonamidate derivatives as monomers. The H-phosphonamidate monomers having a heterocyclic amino group as the leaving group reacted with an alcohol to form an internucleotidic H-phosphonate diester under mild basic conditions without using additives. The resultant internucleotidic linkage was converted into a more stable linkage, such as an S-cyanoethyl phosphorothioate diester. Moreover, under the conditions for detritylation, the unreacted H-phosphonamidate monomer was converted into a water-soluble compound, which was easily removed by extraction. Thus, only simple extractions were required to purify intermediates, and the solution-phase synthesis of trithymidine diphosphorothioate from the monomer was achieved with only one silica gel column chromatography purification. This method was applied to deoxyadenosine, deoxycytidine, and deoxyguanosine derivatives. This strategy enables us to reduce the number of reagents and simplify the purification process.


Assuntos
Oligodesoxirribonucleotídeos , Organofosfonatos , Oligodesoxirribonucleotídeos/química
6.
Org Biomol Chem ; 21(37): 7580-7592, 2023 09 27.
Artigo em Inglês | MEDLINE | ID: mdl-37674464

RESUMO

In this study, we developed a new approach for the solid-phase synthesis of oligodeoxynucleotides (ODNs) using nucleobase-unprotected oxazaphospholidine derivatives. We tackled the problem of the difficult purification of N-unprotected monomers due to their high affinity to silica gel by introducing a tetrahydrogeranyl group into the oxazaphospholidine monomers, thereby enhancing the lipophilicity and facilitating the isolation. In addition, the cyclic structure of oxazaphospholidine enabled a hydroxy-group-selective condensation with sufficient efficiency. Unmodified and boranophosphate/phosphate chimeric ODNs were successfully synthesized using this strategy. This synthetic method can be expected to afford ODNs containing base-labile functional groups.


Assuntos
Oligodesoxirribonucleotídeos , Técnicas de Síntese em Fase Sólida , Oligodesoxirribonucleotídeos/química , Oxazóis/química , Estereoisomerismo
7.
BMC Endocr Disord ; 23(1): 276, 2023 Dec 18.
Artigo em Inglês | MEDLINE | ID: mdl-38110958

RESUMO

BACKGROUND: Primary adrenal leiomyosarcoma is a rare and aggressive mesenchymal tumor derived from the smooth muscle wall of a central adrenal vein or its tributaries; therefore, tumors tend to invade the inferior vena cava and cause thrombosis. The great majority of tumors grow rapidly, which makes the disease difficult to diagnose in its early clinical stages and needs differentiation from adrenocortical carcinomas for the selection of chemotherapy including mitotane which causes adrenal insufficiency. CASE PRESENTATION: We presented two patients with adrenal leiomyosarcoma who were referred to our hospital with abdominal pain and harboring large adrenal tumors and inferior vena cava thrombosis. The endocrine findings, including serum catecholamine levels, were unremarkable. These two patients were considered clinically inoperable, and CT-guided core needle biopsy was performed to obtain the definitive histopathological diagnosis and determine the modes of therapy. The masses were subsequently diagnosed as primary adrenal leiomyosarcoma based on the histological features and positive immunoreactivity for SMA (smooth muscle actin), desmin, and vimentin. CONCLUSIONS: Adrenal leiomyosarcoma derived from the smooth muscle wall of a central adrenal vein or its tributaries is rare but should be considered a differential diagnosis in the case of nonfunctioning adrenal tumors extending directly to the inferior vena cava. CT-guided biopsy is considered useful for histopathological diagnosis and clinical management of patients with inoperable advanced adrenal tumors without any hormone excess.


Assuntos
Neoplasias do Córtex Suprarrenal , Neoplasias das Glândulas Suprarrenais , Leiomiossarcoma , Trombose , Humanos , Leiomiossarcoma/diagnóstico , Leiomiossarcoma/patologia , Trombose/diagnóstico , Neoplasias das Glândulas Suprarrenais/diagnóstico por imagem , Diagnóstico Diferencial , Neoplasias do Córtex Suprarrenal/diagnóstico
8.
Chem Pharm Bull (Tokyo) ; 71(7): 616-619, 2023.
Artigo em Inglês | MEDLINE | ID: mdl-37394608

RESUMO

We developed a simple and sensitive analytical HPLC method for the determination of acetylated hyaluronic acid (AcHA) in moisturizing and milk lotions. AcHA with different molecular weights was separated as a single peak using a C4 column and detected through post-column derivatization using 2-cyanoacetamide. The limits of detection and quantification were 60 and 200 ng, respectively. We found that AcHA in water was successfully extracted into a strong anion exchange (SAX) spin column with a recovery rate of AcHA was 63.8 ± 1.8%. Although the supernatant from acetone precipitation of lotions could pass through the spin column, the recovery rate (%) and accuracy of AcHA were affected by the viscous properties of cosmetics and acidic and acetone-soluble ingredients. Upon conducting analytical methods in this study, the concentration of AcHA in nine lotions was found to have ranged from 7.50 to 83.3 µg/mL. These values are comparable to the concentration range of AcHA in emulsions that have been previously evaluated for their superior effects. We believe that the analytical and extraction method is useful for the qualitative analysis of AcHA in moisturizing and milk lotions.


Assuntos
Ácido Hialurônico , Leite , Animais , Cromatografia Líquida de Alta Pressão/métodos , Acetona , Emulsões
9.
Minim Invasive Ther Allied Technol ; 32(6): 345-347, 2023 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-37729442

RESUMO

A 68-year-old man with a history of valve-sparing aortic root replacement and endoscopic aortic valve replacement was admitted to our hospital with dyspnea. Transthoracic echocardiography revealed severe pulmonary valve regurgitation. The patient had undergone cardiac surgery twice, through median sternotomy and right thoracotomy; therefore, we planned endoscopic pulmonary valve replacement via the left thoracic approach. The patient was placed in a modified right lateral decubitus position and underwent mild hypothermic cardiopulmonary bypass. An on-pump beating-heart technique was used during surgery. The 3D endoscopic system and trocars for surgical instruments were inserted through the left 3rd and 4th intercostal spaces. After incision of the pulmonary artery, the pulmonary cusps were resected. A 27-mm St Jude Medical Epic heart valve was implanted in the intra-annular position. Subsequently, the left atrial appendage was resected. The patient was discharged without complications. To our knowledge, this is the first case of totally endoscopic pulmonary valve replacement.


Assuntos
Procedimentos Cirúrgicos Cardíacos , Implante de Prótese de Valva Cardíaca , Próteses Valvulares Cardíacas , Valva Pulmonar , Masculino , Humanos , Idoso , Implante de Prótese de Valva Cardíaca/métodos , Valva Pulmonar/cirurgia , Procedimentos Cirúrgicos Cardíacos/métodos , Endoscopia , Valva Aórtica/cirurgia , Procedimentos Cirúrgicos Minimamente Invasivos/métodos
10.
Kyobu Geka ; 76(6): 463-467, 2023 Jun.
Artigo em Japonês | MEDLINE | ID: mdl-37258026

RESUMO

A 60-year-old woman was admitted to our institution for exertional dyspnea. Transthoracic echocardiography revealed a 1.6 cm secundum atrial septal defect( ASD) and a 4.2×3.1 cm mobile left atrial mass originating from the ASD. The tumor migrated to the mitral valve during diastole and to the atrial septal defect during systole. A totally endoscopic approach via a small right thoracotomy was adopted to resect the mass and close the ASD with a Hemashield patch. Histopathologic examination of the excised mass was consistent with myxoma. The postoperative course was uneventful. A 2-year follow-up revealed no recurrence of the myxoma and ASD.


Assuntos
Fibrilação Atrial , Neoplasias Cardíacas , Comunicação Interatrial , Mixoma , Feminino , Humanos , Pessoa de Meia-Idade , Comunicação Interatrial/diagnóstico por imagem , Comunicação Interatrial/cirurgia , Neoplasias Cardíacas/diagnóstico por imagem , Neoplasias Cardíacas/cirurgia , Ecocardiografia , Mixoma/diagnóstico por imagem , Mixoma/cirurgia
11.
Bull Tokyo Dent Coll ; 64(3): 89-95, 2023 Dec 28.
Artigo em Inglês | MEDLINE | ID: mdl-37599087

RESUMO

The aim of this study was to investigate the effects of combining mechanical (ultrasonic) and chemical cleaning (using denture cleaners) on the surface roughness of silicone or acrylic soft relining materials. The silicone soft relining material with the lowest Shore A hardness and a acrylic soft relining material routinely used in Japan were selected. Four groups were established based on type of treatment: immersion in water (W); ultrasonic cleaning in tap water (U); ultrasonic cleaning in a hypochlorous acid denture cleanser (HU); or ultrasonic cleaning in an acidic denture cleanser (AU). Following the tests, surface roughness was determined as the arithmetic mean height of the surface (Sa) and maximum height (Sz). Data were analyzed using the Kruskal-Wallis test followed by Bonferroni correction for a multiple comparison. No significant difference was observed in the Sa or Sz of the silicone soft relining material between the 4 groups. Significant differences were observed in the Sa of the acrylic soft relining material between Groups W and HU (p=0.008) and between Groups W and AU (p=0.008), but no significant differences in the Sz among the 4 groups. Combining U with AU or U with HU yielded no increase in the surface roughness of the silicon soft relining material. The surface roughness of the acrylic soft relining material showed an increase, however, with the combination treatments used.


Assuntos
Reembasadores de Dentadura , Silicones , Humanos , Higienizadores de Dentadura , Teste de Materiais , Propriedades de Superfície , Água , Bases de Dentadura
12.
J Org Chem ; 87(6): 3895-3909, 2022 03 18.
Artigo em Inglês | MEDLINE | ID: mdl-34908418

RESUMO

In this study, we successfully synthesized boranophosphate (PB), phosphorothioate (PS), and phosphate (PO) chimeric oligonucleotides (ODNs) as a candidate for the antisense oligonucleotides (ASOs). The PB/PS/PO-ODNs were synthesized utilizing H-boranophosphonate, H-phosphonothioate, and H-phosphonate monomers. Each monomer was condensed with a hydroxy group to create H-boranophosphonate, H-phosphonothioate, and H-phosphonate diester linkages, which were oxidized into PB, PS, and PO linkages in the final stage of the synthesis, respectively. As for condensation of an H-phosphonothioate monomer, regulating chemoselectivity was necessary since the monomer has two nucleophilic centers: S and O atoms. To deal with this problem, we used phosphonium-type condensing reagents, which could control the chemoselectivity. In this strategy, we could synthesize PB/PS/PO oligomers, including a 2'-OMe gapmer-type dodecamer. The physiological and biological properties of the synthesized chimeric ODNs were also evaluated. Insights from the evaluation of physiological and biological properties suggested that the introduction of suitable P-modification and sugar modification at proper sites of ODNs would control the duplex stability, nuclease resistance, RNase H-inducing ability, and one base mismatch discrimination ability, which are critical properties as potent ASOs.


Assuntos
Organofosfonatos , Oligonucleotídeos Fosforotioatos , Boranos , Oligonucleotídeos Antissenso , Fosfatos , Técnicas de Síntese em Fase Sólida
13.
Org Biomol Chem ; 20(42): 8243-8258, 2022 Nov 02.
Artigo em Inglês | MEDLINE | ID: mdl-36222332

RESUMO

Recently, double-stranded oligonucleotide therapeutics with A-type duplex structures such as short interfering RNAs have gained considerable attention. We have reported the synthesis of cationic oligosaccharides that selectively bind to A-type oligonucleotide duplexes. In particular, oligodiaminogalactose (ODAGal) has a strong stabilizing effect on A-type oligonucleotide duplexes. However, an efficient synthetic method has not been established for ODAGals and the properties of ODAGals have been investigated only up to 4mer. The most crucial problem of the synthesis was side reactions on a p-methoxybenzyl (PMB) protecting group of a 3-hydroxy group. In this paper, the benzyl (Bn) group was chosen as a protecting group of the 3-hydroxy group to suppress the side reactions on protecting groups, and the yields of glycosylation reactions were significantly improved. Moreover, optimization of the conditions for the deprotection of the Bn groups allowed the efficient synthesis of fully deprotected ODAGals, and ODAGal 5mer and 6mer were synthesized for the first time. In addition, we systematically investigated the effects of these ODAGals on the properties of several oligonucleotide duplexes. It was found that ODAGal 4-6mers stabilized the A-type oligonucleotide duplexes thermally and biologically, typically without their structural changes and the effect was notable with longer ODAGals.


Assuntos
Oligonucleotídeos , RNA de Cadeia Dupla , Oligonucleotídeos/química , RNA Interferente Pequeno , Cátions/química , Oligossacarídeos/química
14.
Kyobu Geka ; 75(3): 189-192, 2022 Mar.
Artigo em Japonês | MEDLINE | ID: mdl-35249951

RESUMO

A 73-year-old man had Stanford type B acute aortic dissection 11 years before. He had underwent thoracoabdominal aortic replacement due to thoracoabdominal aneurysm nine years before and hemiarch aortic replacement due to Stanford type A acute aortic dissection four years before. We performed surgery because the dissecting aortic aneurysm in the distal arch has enlarged. We selected thoracic endovascular aortic repair( TEVAR) because of reoperation, but the true lumen of the descending aorta was highly narrowed, we had to deploy stent-grafts into the false lumen. Since the proximal and distal parts of endovascular thoracic stent-grafts were deployed into the previously implanted Dacron grafts, we could deploy them without vascular injury. If both proximal and distal parts of stent-grafts can be deployed into vascular prosthesis, deploying the stent-grafts into the false lumen may be a feasible option.


Assuntos
Aneurisma da Aorta Torácica , Implante de Prótese Vascular , Procedimentos Endovasculares , Idoso , Aneurisma da Aorta Torácica/diagnóstico por imagem , Aneurisma da Aorta Torácica/cirurgia , Prótese Vascular , Humanos , Masculino , Estudos Retrospectivos , Stents , Resultado do Tratamento
15.
Eur Radiol ; 31(8): 5454-5463, 2021 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-33515087

RESUMO

OBJECTIVE: The impact of clinical information on radiological diagnoses and subsequent clinical management has not been sufficiently investigated. This study aimed to compare diagnostic performance between radiological reports made with and without clinical information and to evaluate differences in the clinical management decisions based on each of these reports. METHODS: We retrospectively reviewed 410 patients who presented with acute abdominal pain and underwent unenhanced (n = 248) or enhanced CT (n = 162). Clinical information including age, sex, current and past history, physical findings, and laboratory tests were collected. Six radiologists independently interpreted CTs that were randomly assigned with or without clinical information, made radiological diagnoses, and scored the diagnostic confidence level. Four general and emergency physicians simulated clinical management (i.e., followed up in the outpatient clinic, hospitalized for conservative therapy, or referred to other departments for invasive therapy) based on reports made with or without the clinical information. Reference standards for the radiological diagnoses and clinical management were defined by an independent expert panel. RESULTS: The radiological diagnoses made with clinical information were more accurate than those made without clinical information (93.7% vs. 87.8%, p = 0.008). Median interpretation time for radiological reporting with clinical information was significantly shorter than that without clinical information (median 122.0 vs. 139.0 s, p < 0.001). Clinical simulation better matched the reference standard for clinical management when radiological diagnoses were made with reference to clinical information (97.3% vs. 87.8%, p < 0.001). CONCLUSION: Access to adequate clinical information enables accurate radiological diagnoses and appropriate subsequent clinical management of patients with acute abdominal pain. KEY POINTS: • Radiological interpretation improved diagnostic accuracy and confidence level when clinical information was provided. • Providing clinical information did not extend the interpretation time required by radiologists. • Radiological interpretation with clinical information led to correct clinical management by physicians.


Assuntos
Médicos , Tomografia Computadorizada por Raios X , Dor Abdominal/diagnóstico por imagem , Dor Abdominal/terapia , Serviço Hospitalar de Emergência , Humanos , Radiologistas , Estudos Retrospectivos
16.
BMC Neurol ; 21(1): 274, 2021 Jul 09.
Artigo em Inglês | MEDLINE | ID: mdl-34243715

RESUMO

BACKGROUND: Ischemic stroke, including transient ischemic attack (TIA) and acute-phase cerebral infarction (aCI), is a serious health problem in the aging society. Thus, this study aimed to identify TIA and aCI biomarkers. METHODS: In 19 patients with TIA, candidate antigens recognized by serum IgG autoantibodies were screened using a human aortic endothelial cell cDNA library. Through amplified luminescent proximity homogeneous assay-linked immunosorbent assay (AlphaLISA), serum antibody levels against the candidate antigens were examined in healthy donor (HD), TIA, and aCI cohorts (n = 285, 92, and 529). The plasma antibody levels in the Japan Public Health Center-based Prospective Cohort Study (1991-1993) were also examined. RESULTS: The candidate antigens were aldolase A (ALDOA) and fumarate hydratase (FH). In AlphaLISA, patients with TIA or aCI had higher anti-ALDOA antibody (ALDOA-Ab) and anti-FH antibody (FH-Ab) levels than the HDs (P < 0.05). In a multivariate logistic regression analysis, the ALDOA-Ab (odds ratio [OR]: 2.46, P = 0.0050) and FH-Ab (OR: 2.49, P = 0.0037) levels were independent predictors of TIA. According to the case-control study, the ALDOA-Ab (OR: 2.50, P < 0.01) and FH-Ab (OR: 2.60, P < 0.01) levels were associated with aCI risk. In a correlation analysis, both ALDOA-Abs and FH-Abs were well associated with hypertension, coronary heart disease, and habitual smoking. These antibody levels also correlated well with maximum intima-media thickness, which reflects atherosclerotic stenosis. CONCLUSIONS: ALDOA-Abs and FH-Abs can be novel potential biomarkers for predicting atherosclerotic TIA and aCI.


Assuntos
Autoanticorpos/sangue , Infarto Cerebral , Ataque Isquêmico Transitório , Biomarcadores/sangue , Estudos de Casos e Controles , Infarto Cerebral/sangue , Infarto Cerebral/epidemiologia , Frutose-Bifosfato Aldolase/imunologia , Humanos , Ataque Isquêmico Transitório/sangue , Ataque Isquêmico Transitório/epidemiologia
17.
Org Biomol Chem ; 19(31): 6865-6870, 2021 08 21.
Artigo em Inglês | MEDLINE | ID: mdl-34323246

RESUMO

Sequence-dependent off-target effects are a serious problem of antisense oligonucleotide-based drugs. Some of these side effects are induced by ribonuclease H (RNase H)-mediated cleavage of non-target RNAs with base sequences similar to that of the target RNA. We found that an artificial cationic oligosaccharide, ODAGal4, improved single-base discrimination for RNase H cleavage.


Assuntos
Ribonuclease H
18.
Circ J ; 85(10): 1885-1891, 2021 09 24.
Artigo em Inglês | MEDLINE | ID: mdl-33762525

RESUMO

BACKGROUND: Effects of rapid electrical defibrillation and ß-blockade on coronary ischemia/reperfusion-induced ventricular fibrillation (VF) during cardiopulmonary resuscitation (CPR) remain unknown.Methods and Results:After induction of VF by 30 min of ischemia followed by reperfusion, animals were treated with defibrillation alone (Group A, n=13), 2 min of open-chest cardiac massage followed by defibrillation (Group B, n=11), or the same therapy to Group B with propranolol (1 mg/kg, i.v.) treatment before ischemia/reperfusion (Group C, n=11). If return of spontaneous circulation (ROSC) was not attained, each therapy was repeated ≤3 times (Set-1). When ROSC was not obtained within Set-1, cardiac massage was applied to all animals followed by defibrillation, which was repeated ≤3 times (Set-2). ROSC after Set-1 was 8% in Group A, 82% in Group B and 82% in Group C, whereas that after Set-2 was 62% in Group A, 100% in Group B and 82% in Group C. Each animal with ROSC in Groups A (n=8) and B (n=11) showed sinus rhythm, whereas those in Group C (n=9) had sinus rhythm (n=5), atrial fibrillation (n=1), accelerated idioventricular rhythm (n=2) and atrioventricular block (n=1). Post ROSC heart rate and mean arterial pressure were significantly lower in Group C. CONCLUSIONS: Cardiac massage increased the likelihood of ROSC vs. rapid defibrillation, but ß-blocker pretreatment may worsen hemodynamics and electrical stability after ROSC.


Assuntos
Reanimação Cardiopulmonar , Parada Cardíaca , Animais , Modelos Animais de Doenças , Cães , Cardioversão Elétrica , Parada Cardíaca/terapia , Massagem Cardíaca , Humanos , Isquemia , Reperfusão , Fibrilação Ventricular/terapia
19.
Nucleic Acids Res ; 47(14): 7321-7332, 2019 08 22.
Artigo em Inglês | MEDLINE | ID: mdl-31214713

RESUMO

AntimiR is an antisense oligonucleotide that has been developed to silence microRNA (miRNA) for the treatment of intractable diseases. Enhancement of its in vivo efficacy and improvement of its toxicity are highly desirable but remain challenging. We here design heteroduplex oligonucleotide (HDO)-antimiR as a new technology comprising an antimiR and its complementary RNA. HDO-antimiR binds targeted miRNA in vivo more efficiently by 12-fold than the parent single-stranded antimiR. HDO-antimiR also produced enhanced phenotypic effects in mice with upregulated expression of miRNA-targeting messenger RNAs. In addition, we demonstrated that the enhanced potency of HDO-antimiR was not explained by its bio-stability or delivery to the targeted cell, but reflected an improved intracellular potency. Our findings provide new insights into biology of miRNA silencing by double-stranded oligonucleotides and support the in vivo potential of this technology based on a new class of for the treatment of miRNA-related diseases.


Assuntos
DNA de Cadeia Simples/genética , Inativação Gênica , MicroRNAs/genética , Ácidos Nucleicos Heteroduplexes/genética , Oligonucleotídeos Antissenso/genética , Animais , Northern Blotting , DNA de Cadeia Simples/metabolismo , Feminino , Regulação da Expressão Gênica , Rim/metabolismo , Fígado/metabolismo , Camundongos Endogâmicos ICR , MicroRNAs/metabolismo , Ácidos Nucleicos Heteroduplexes/metabolismo , Ácidos Nucleicos Heteroduplexes/farmacocinética , Oligonucleotídeos Antissenso/metabolismo , Oligonucleotídeos Antissenso/farmacocinética , RNA Mensageiro/genética , RNA Mensageiro/metabolismo , Baço/metabolismo
20.
Kyobu Geka ; 74(6): 424-428, 2021 Jun.
Artigo em Japonês | MEDLINE | ID: mdl-34059584

RESUMO

We report a case of a ruptured coronary artery aneurysm. An 87-year-old woman suffered from cardiac tamponade due to a ruptured coronary artery aneurysm. Coronary angiography showed a giant coronary aneurysm without coronary artery fistula. Emergency surgery was performed through median sternotomy. We performed aneurysmectomy and ligation of the perfusion arteries under cardiopulmonary bypass. The patient's postoperative course was uneventful. We also reviewed nine cases of ruptured coronary artery aneurysm without coronary artery fistula in Japan. The disease is a rare clinical state and considered to be an indication for emergency surgery.


Assuntos
Tamponamento Cardíaco , Aneurisma Coronário , Idoso de 80 Anos ou mais , Tamponamento Cardíaco/diagnóstico por imagem , Tamponamento Cardíaco/etiologia , Tamponamento Cardíaco/cirurgia , Aneurisma Coronário/complicações , Aneurisma Coronário/diagnóstico por imagem , Aneurisma Coronário/cirurgia , Angiografia Coronária , Vasos Coronários/diagnóstico por imagem , Vasos Coronários/cirurgia , Feminino , Humanos , Japão
SELEÇÃO DE REFERÊNCIAS
Detalhe da pesquisa