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Gi T, Sato Y, Tokumitsu T, Yamashita A, Moriguchi-Goto S, Takeshima H, Sato S, Asada Y. Microvascular proliferation of brain metastases mimics glioblastomas in squash cytology. Cytopathology 2016; 28:228-234. [PMID: 27995658 DOI: 10.1111/cyt.12405] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/13/2016] [Indexed: 11/28/2022]
Abstract
OBJECTIVE Although microvascular proliferation is a key feature in the diagnosis of high-grade glioma, the characteristics of metastatic tumour vessels in smear preparations have not been documented. In this study, the vascular changes in metastatic brain tumours, using squash cytology to examine the vascular patterns in brain metastases, were reviewed. METHODS One hundred and forty-three squash smears of brain tissue, including 25 normal or reactive tissue, 23 malignant lymphomas, 8 grade I glioma (pilocytic astrocytoma), 23 grade II glioma (diffuse astrocytoma and oligodendroglioma), 42 grade IV glioma (glioblastoma), and 22 metastasis, were assessed. Two vascular patterns were assessed: thick and branching, and glomeruloid. The vessel density, nuclear layer and the number of vessel branches were compared. Furthermore, tumour vessels of brain metastases were analysed by histology and for immunohistochemical expression of CD34, α-smooth muscle actin (SMA) and high-molecular-weight caldesmon (h-CD). RESULTS Among 22 metastatic tumours, thick and branching vessels were found in 17 (77%) and glomeruloid vessels in 13 (59%). These incidences of microvascular proliferation patterns were similar to those of glioblastomas or pilocytic astrocytomas. Vessel density, nuclear layer and vessel wall branches were significantly higher in metastatic tumours than malignant lymphomas, grade II gliomas or normal brain tissues. Glomeruloid vessels consisted of CD34-positive cells and α-SMA-positive cells, and α-SMA-positive cells had a low h-CD expression. These immunohistochemical patterns were similar to those of high-grade gliomas. CONCLUSIONS The vascular features of metastatic brain tumours are similar to those of glioblastomas, suggesting that these microvascular proliferations contribute to the progression of metastatic tumours.
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Nakanishi K, Yamashita A, Miyamoto T, Takeguch R, Furuya A, Matsuo K, Tanahashi Y, Kawamura M, Sengoku K. P450 oxidoreductase deficiency with maternal virilization during pregnancy. CLIN EXP OBSTET GYN 2016. [DOI: 10.12891/ceog3172.2016] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022]
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Tokumitsu T, Sato Y, Yamashita A, Moriguchi-Goto S, Kondo K, Nanashima A, Asada Y. Immunocytochemistry for Claudin-18 and Maspin in biliary brushing cytology increases the accuracy of diagnosing pancreatobiliary malignancies. Cytopathology 2016; 28:116-121. [PMID: 27527114 DOI: 10.1111/cyt.12368] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/16/2016] [Indexed: 12/14/2022]
Abstract
OBJECTIVE Biliary brush cytology is an important diagnostic tool in the evaluation of pancreatobiliary malignancies. However, it is difficult to distinguish between malignant and benign cells. The present study evaluated the utility of immunocytochemical expression of Claudin-18 and Maspin in brushing cytology specimens of pancreatobiliary lesions in the diagnosis of pancreatobiliary malignancies. METHODS The study retrospectively assessed biliary and pancreatic duct brushing cytology specimens of 43 patients whose pancreatobiliary lesions were histologically diagnosed at the University of Miyazaki Hospital. Scanty cellularity slides and cases with no histological confirmation were excluded. Alcohol-fixed and Papanicolaou-stained slides were immunostained with monoclonal antibodies to Claudin-18 and Maspin. RESULTS Of the 43 patients, 35 (81.4%) were finally histologically diagnosed with invasive adenocarcinomas. The sensitivity of routine cytology for the detection of malignancy was 63%, and the specificity was 100%. The sensitivity of cytology in combination with immunocytochemical expression of Claudin-18 (89%) or Claudin-18 and/or Maspin (97%) was significantly higher than that of cytology alone (P < 0.01). CONCLUSION Immunocytochemical staining for Claudin-18 and Maspin improved the diagnostic sensitivity for pancreatobiliary adenocarcinomas.
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Li ZY, Yamashita A, Kawashita N, Sasaki T, Pan Y, Ono KI, Ikuta K, Li YG. Characterization of two anti-dengue human monoclonal antibodies prepared from PBMCs of patients with dengue illness in Thailand. Acta Virol 2016; 60:166-73. [PMID: 27265466 DOI: 10.4149/av_2016_02_166] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
The global spread of the four dengue virus (DENV) serotypes (dengue-1 to -4) has made this virus a major and growing public health concern. Generally, pre-existing neutralizing antibodies derived from primary infection play a significant role in protecting against subsequent infection with the same serotype. By contrast, these pre-existing antibodies are believed to mediate a non-protective response to subsequent heterotypic DENV infections, leading to the onset of dengue illness. In this study, two monoclonal antibodies prepared by using peripheral blood mononuclear cells (PBMCs) from patients with dengue fever were characterized. Epitope mapping revealed that amino acid residues 254-278 in domain II of the viral envelope protein E were the target region of these antibodies. A database search revealed that certain sequences in this epitope region showed high conservation among the four serotypes of DENV. These two human monoclonal antibodies could neutralize DENV-2,-4 more effectively than DENV-1,-3. The amino acid sequences could not explain this difference in neutralizing activity. However, the 3D structure results showed that amino acid 274 could be the critical residue for the difference in neutralization. These results may provide basic information for the development of a dengue vaccine.
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Tamura K, Wakui H, Azushima K, Uneda K, Haku S, Kobayashi R, Ohki K, Haruhara K, Kinguchi S, Matsuda M, Yamashita A, Umemura S. Angiotensin II Type 1 Receptor Binding Molecule ATRAP as a Possible Modulator of Renal Sodium Handling and Blood Pressure in Pathophysiology. Curr Med Chem 2016; 22:3210-6. [PMID: 26295465 DOI: 10.2174/0929867322666150821095036] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2015] [Revised: 08/19/2015] [Accepted: 08/20/2015] [Indexed: 11/22/2022]
Abstract
Exaggerated activation of the renin-angiotensin system via tissue angiotensin II (Ang II) type 1 receptor (AT1R) signaling exerts detrimental effects on cardiovascular, renal and endocrine systems to provoke hypertension and related target organ damage. On the other hand, accumulated research evidence of both basic and clinical studies shows that physiological AT1R signaling also plays an indispensable role for the normal organ development such as the kidney and the maintenance of cardiovascular and renal homeostasis. Such functional diversity of AT1R signaling prompts us to seek a new strategy of selective modulation of AT1R signaling in pathophysiology. In the course of an investigational search for a means to functionally and selectively modulate AT1R signaling for that purpose, a molecule directly interacting with the carboxyl-terminal cytoplasmic domain of AT1R was identified by employing yeast two-hybrid screening of a mouse kidney cDNA library and named AT1R-associated protein (ATRAP). The results of functional analysis showed that ATRAP promotes constitutive AT1R internalization in cultured cells and inhibits Ang II-mediated pathological response in mouse distal convoluted cells. The ATRAP is expressed in a variety of tissues including the kidney where ATRAP is abundantly distributed in epithelial cells along the renal tubules. The results employing genetic engineered mice with modified ATRAP expression showed that ATRAP plays a key role in the regulation of renal sodium handling and the modulation of blood pressure in response to pathological stimuli such as chronic Ang II infusion, and suggest ATRAP to be a target of interest.
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Oda T, Okamura T, Miyazaki Y, Nakamura T, Mikamo A, Wada Y, Yamashita A, Takahashi M, Hayashida K, Hamano K, Yano M. 1-Year Follow-Up of Contained Aortic Root Rupture After Transcatheter Aortic Valve Replacement. JACC Cardiovasc Interv 2016; 9:295-296. [PMID: 26777328 DOI: 10.1016/j.jcin.2015.10.037] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/05/2015] [Accepted: 10/08/2015] [Indexed: 10/22/2022]
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Nakanishi K, Yamashita A, Miyamoto T, Takeguchi R, Furuya A, Matsuo K, Tanahashi Y, Kawamura M, Sengoku K. P450 oxidoreductase deficiency with maternal virilization during pregnancy. CLIN EXP OBSTET GYN 2016; 43:902-904. [PMID: 29944250] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
PURPOSE The authors report on a rare case of maternal virilization during pregnancy caused by autosomal recessive P450 oxidore- ductase (POR) deficiency. MATERIALS AND METHODS A 24-year-old primigravida developed a deepening voice and hirsutism in the second trimester. Prenatal ultrasonography failed to detect any fetal abnormality and fetal growth was normal. POR deficiency was suspected, but the mother declined fetal genetic testing. A female neonate was delivered by cesarean section at 41 weeks' gestation. RESULTS The neonate had skeletal abnormalities. Mutational analysis of the POR gene demonstrated homozygosity for c.1370 G>A and p.R457H in the patient and heterozygosity in her parents. POR deficiency was confirmed in the neonate. CONCLUSION POR deficiency should be suspected in cases of maternal virilization. Maternal urinary estriol, fetal magnetic resonance imaging, and parental genetic testing should be performed. Parental consent for fetal genetic testing should be sought to ensure prompt diagnosis and early treatment.
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Niihara M, Tsubosa Y, Yamashita A, Tsumaki H, Ishikawa H, Nagata N, Onozawa Y, Fukuda H. SUN-PP136: Changes in Body Weight and Body Mass Index After Esophagectomy. Clin Nutr 2015. [DOI: 10.1016/s0261-5614(15)30286-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Utada K, Ishida K, Tohyama S, Urushima Y, Mizukami Y, Yamashita A, Uchida M, Matsumoto M. The combination of insulin-like growth factor 1 and erythropoietin protects against ischemic spinal cord injury in rabbits. J Anesth 2015; 29:741-8. [PMID: 26003536 DOI: 10.1007/s00540-015-2031-y] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2015] [Accepted: 05/05/2015] [Indexed: 11/24/2022]
Abstract
INTRODUCTION Insulin-like growth factor 1 (IGF-1) and erythropoietin (EPO) have been reported to independently protect against ischemic spinal cord injury in rabbits. In the present study, we investigated whether the combination of IGF-1 and EPO protects against ischemic spinal cord injury in rabbits. METHODS Animals were assigned to 1 of 4 groups (n = 6 in each): a control group (saline), an IGF-1 group (IGF-1 0.3 mg/kg), an EPO group (EPO 800 U/kg), or an IGF-1 + EPO group (IGF-1 0.3 mg/kg + EPO 800 U/kg). Spinal cord ischemia was produced by occluding the abdominal aorta for 15 min. Saline, IGF-1, and EPO were administered intravenously just after the start of reperfusion. Hindlimb motor function was assessed daily for 7 days, after which histopathological evaluation was performed. To analyze phosphorylation of signal transduction molecules, animals were assigned to 1 of the 4 groups (n = 8 in each). Spinal cord ischemia and the treatment were the same as those described above. The spinal cords were removed at 15 or 30 min after reperfusion and used to analyze phosphorylation of signal transduction molecules. Four animals served as the preischemic control, and the spinal cord was removed just before the start of ischemia. RESULTS In the IGF-1 + EPO group, both neurological and histopathological outcomes were significantly improved as compared to the control group, which was consistent with the increase of Janus kinase-2 (JAK2) phosphorylation. CONCLUSIONS The combination of IGF-1 and EPO protects against ischemic spinal cord injury in rabbits. JAK2 might contribute to the protective effect.
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Arimoto T, Kawana K, Adachi K, Ikeda Y, Nagasaka K, Tsuruga T, Yamashita A, Oda K, Ishikawa M, Kasamatsu T, Onda T, Konishi I, Yoshikawa H, Yaegashi N. Minimization of curative surgery for treatment of early cervical cancer: a review. Jpn J Clin Oncol 2015; 45:611-6. [DOI: 10.1093/jjco/hyv048] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2014] [Accepted: 03/10/2015] [Indexed: 11/14/2022] Open
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Ishida K, Yamashita A, Uchida M, Matsumoto M. [Development of postoperative cognitive dysfunction following major vascular surgery]. MASUI. THE JAPANESE JOURNAL OF ANESTHESIOLOGY 2014; 63:1211-1218. [PMID: 25731052] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The development of postoperative cognitive dysfunction (POCD) is a devastating complication, leading to a poor postoperative quality of life. Even though the number of patients undergoing major vascular surgery has increased, the development of POCD has not been well evaluated in these patients compared with patients undergoing coronary artery bypass graft surgery (CABG). According to previous reports, more patients undergoing major vascular surgery by deep circulatory arrest or retrograde cerebral perfusion, and an equal or even larger number of patients undergoing surgery by selective cerebral perfusion, seem to develop POCD when compared with patients after CABG. However, only a small numbers of patients have been assessed and the timing of evaluating POCD has varied in previous studies. Well-organized studies with a sufficient number of cases and systematic post-operative evaluation of POCD are necessary.
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Tachibana K, Higami T, Miyaki Y, Hagiwara T, Yamashita A, Takagi N. 136 * IMPACT OF SEQUENTIAL BYPASS GRAFTING WITH FULL SKELETONISED IN-SITU ARTERIAL GRAFTS. Interact Cardiovasc Thorac Surg 2014. [DOI: 10.1093/icvts/ivu276.136] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Iwakiri T, Matsuura Y, Yamashita A, Uezono S, Hisanaga S, Tokura T, Kitamura K, Asada Y, Fujimoto S. Serum C-reactive protein reflects the proportions of cellular crescent formation and glomerulosclerosis in patients with microscopic polyangiitis. Presse Med 2013. [DOI: 10.1016/j.lpm.2013.02.195] [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] Open
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Shindo H, Maekawa S, Komase K, Miura M, Kadokura M, Sueki R, Komatsu N, Shindo K, Amemiya F, Nakayama Y, Inoue T, Sakamoto M, Yamashita A, Moriishi K, Enomoto N. IL-28B (IFN-λ3) and IFN-α synergistically inhibit HCV replication. J Viral Hepat 2013; 20:281-9. [PMID: 23490373 DOI: 10.1111/j.1365-2893.2012.01649.x] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/15/2012] [Accepted: 06/07/2012] [Indexed: 01/09/2023]
Abstract
Genetic variation in the IL-28B (interleukin-28B; interferon lambda 3) region has been associated with sustained virological response (SVR) rates in patients with chronic hepatitis C treated with peginterferon-α and ribavirin. However, the mechanisms by which polymorphisms in the IL-28B gene region affect host antiviral responses are not well understood. Using the HCV 1b and 2a replicon system, we compared the effects of IFN-λs and IFN-α on HCV RNA replication. The anti-HCV effect of IFN-λ3 and IFN-α in combination was also assessed. Changes in gene expression induced by IFN-λ3 and IFN-α were compared using cDNA microarray analysis. IFN-λs at concentrations of 1 ng/mL or more exhibited concentration- and time-dependent HCV inhibition. In combination, IFN-λ3 and IFN-α had a synergistic anti-HCV effect; however, no synergistic enhancement was observed for interferon-stimulated response element (ISRE) activity or upregulation of interferon-stimulated genes (ISGs). With respect to the time course of ISG upregulation, the peak of IFN-λ3-induced gene expression occurred later and lasted longer than that induced by IFN-α. In addition, although the genes upregulated by IFN-α and IFN-λ3 were similar to microarray analysis, interferon-stimulated gene expression appeared early and was prolonged by combined administration of these two IFNs. In conclusion, IFN-α and IFN-λ3 in combination showed synergistic anti-HCV activity in vitro. Differences in time-dependent upregulation of these genes might contribute to the synergistic antiviral activity.
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Yonehiro J, Yoshida Y, Yamashita A, Yoshizawa S, Ohta K, Kamata N, Okihara T, Nishimura F. Flavonol-containing phosphorylated pullulan may attenuate pulp inflammation. Int Endod J 2012; 46:119-27. [DOI: 10.1111/j.1365-2591.2012.02095.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2011] [Accepted: 06/01/2012] [Indexed: 01/09/2023]
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41
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Yonehiro J, Yamashita A, Yoshida Y, Yoshizawa S, Ohta K, Kamata N, Okihara T, Nishimura F. Establishment of anex vivopulpitis model by co-culturing immortalized dental pulp cells and macrophages. Int Endod J 2012; 45:1103-8. [DOI: 10.1111/j.1365-2591.2012.02074.x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Yamashita A, Matsumoto M. [Risk management in spinal anesthesia]. MASUI. THE JAPANESE JOURNAL OF ANESTHESIOLOGY 2011; 60:1275-1283. [PMID: 22175167] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
More than one hundred years have passed since Bier first succeeded in spinal anesthesia. Spinal anesthesia now spreads all over the world because it has many advantages. Spinal anesthesia requires both a simple technique and a small volume of drug, produces profound analgesia, and is devoid of systemic pharmacologic side effects. However, several complications after spinal anesthesia have been reported. Although some of them rarely occur, they cause serious consequences once they happen. Those include cardiac arrest, meningitis, intracranial subdural hematoma, spinal epidural hematoma and cauda equina syndrome. Patients should be informed in detail of the incidence, severity, and outcome of these complications, especially when alternative analgesic methods can be chosen. The prediction, early detection and prompt start of the treatment of the complications after spinal anesthesia are important to minimize the risk of adverse outcome.
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MESH Headings
- Anaphylaxis/epidemiology
- Anaphylaxis/etiology
- Anaphylaxis/prevention & control
- Anesthesia, Spinal/adverse effects
- Anesthesia, Spinal/methods
- Heart Arrest/epidemiology
- Heart Arrest/etiology
- Heart Arrest/prevention & control
- Hematoma, Epidural, Spinal/epidemiology
- Hematoma, Epidural, Spinal/etiology
- Hematoma, Epidural, Spinal/prevention & control
- Hematoma, Subdural, Intracranial/epidemiology
- Hematoma, Subdural, Intracranial/etiology
- Hematoma, Subdural, Intracranial/prevention & control
- Humans
- Informed Consent
- Intraoperative Complications/epidemiology
- Intraoperative Complications/etiology
- Intraoperative Complications/prevention & control
- Meningitis/epidemiology
- Meningitis/etiology
- Meningitis/prevention & control
- Polyradiculopathy/epidemiology
- Polyradiculopathy/etiology
- Polyradiculopathy/prevention & control
- Postoperative Complications/epidemiology
- Postoperative Complications/etiology
- Postoperative Complications/prevention & control
- Risk Factors
- Risk Management
- Spinal Cord Injuries/epidemiology
- Spinal Cord Injuries/etiology
- Spinal Cord Injuries/prevention & control
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Matsuda S, Yamashita A, Sato Y, Kitajima S, Koike T, Sugita C, Moriguchi-Goto S, Hatakeyama K, Takahashi M, Koshimoto C, Matsuura Y, Iwakiri T, Chen YE, Fan J, Asada Y. Human C-reactive protein enhances thrombus formation after neointimal balloon injury in transgenic rabbits. J Thromb Haemost 2011; 9:201-8. [PMID: 21029360 DOI: 10.1111/j.1538-7836.2010.04086.x] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
BACKGROUND High plasma levels of C-reactive protein (CRP) constitute a powerful predictive marker of cardiovascular events. Several lines of evidence suggest that CRP has prothrombogenic effects. However, whether CRP directly participates in the pathogenesis of thrombosis in vivo has not been fully clarified. OBJECTIVE To test whether human CRP (hCRP) affects arterial thrombus formation after balloon injury of smooth muscle cell (SMC)-rich or macrophage-rich neointima. METHODS We compared the susceptibility of transgenic (Tg) rabbits expressing hCRP (46.21 ± 13.85 mg L(-1), n = 22) and non-Tg rabbits to arterial thrombus formation after balloon injury of SMC-rich or macrophage-rich neointima. RESULTS Thrombus size on SMC-rich or macrophage-rich neointima was significantly increased, and was accompanied by an increase in fibrin content in hCRP-Tg rabbits, as compared with non-Tg rabbits. Thrombus size did not significantly differ between SMC-rich and macrophage-rich neointima in hCRP-Tg rabbits. Tissue factor (TF) mRNA expression and activity in these neointimal lesions were significantly increased in hCRP-Tg rabbits as compared with non-Tg rabbits. The degree of CRP deposition correlated with the elevated TF expression and thrombus size on injured neointima. In addition, hCRP isolated from hCRP-Tg rabbit plasma induced TF mRNA expression and activity in rabbit cultured vascular SMCs. CONCLUSIONS These results suggest that elevated plasma hCRP levels promote thrombus formation on injured SMC-rich neointima by enhancing TF expression, but have no additive effects in macrophage-rich neointima.
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MESH Headings
- Animals
- Animals, Genetically Modified
- C-Reactive Protein/genetics
- C-Reactive Protein/metabolism
- Catheterization
- Cell Proliferation
- Cells, Cultured
- Disease Models, Animal
- Femoral Artery/injuries
- Femoral Artery/metabolism
- Femoral Artery/pathology
- Humans
- Hyperlipidemias/genetics
- Hyperlipidemias/metabolism
- Macrophages/metabolism
- Male
- Muscle, Smooth, Vascular/injuries
- Muscle, Smooth, Vascular/metabolism
- Muscle, Smooth, Vascular/pathology
- Myocytes, Smooth Muscle/metabolism
- Myocytes, Smooth Muscle/pathology
- RNA, Messenger/metabolism
- Rabbits
- Thromboplastin/genetics
- Thrombosis/blood
- Thrombosis/genetics
- Thrombosis/metabolism
- Thrombosis/pathology
- Time Factors
- Tunica Intima/injuries
- Tunica Intima/metabolism
- Tunica Intima/pathology
- Up-Regulation
- Vascular System Injuries/blood
- Vascular System Injuries/genetics
- Vascular System Injuries/metabolism
- Vascular System Injuries/pathology
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Lira FS, Yamashita A, Carnevali LC, Gonçalves DC, Lima WP, Rosa JC, Caperuto EC, Rosa LFC, Seelaender M. Exercise training reduces PGE2 levels and induces recovery from steatosis in tumor-bearing rats. Horm Metab Res 2010; 42:944-9. [PMID: 21064006 DOI: 10.1055/s-0030-1267949] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
The effects of endurance training on PGE (2) levels and upon the maximal activity of hepatic carnitine palmitoyltransferase (CPT) system were studied in rats bearing the Walker 256 carciosarcoma. Animals were randomly assigned to a sedentary control (SC), sedentary tumor-bearing (ST), exercised control (EC), and as an exercised tumor-bearing (ET) group. Trained rats ran on a treadmill (60% VO (2) max) for 60 min/day, 5 days/week, for 8 weeks. We examined the mRNA expression (RT-PCR) and maximal activity (radioassay) of the carnitine palmitoyltransferase system enzymes (CPT I and CPT II), as well as the gene expression of fatty-acid-binding protein (L-FABP) in the liver. PGE (2) content was measured in the serum, in tumor cells, and in the liver (ELISA). CPT I and CPT II maximal activity were decreased (p<0.01) in ST when compared with SC. In contrast, serum PGE (2) was increased (p<0.05) in cachectic animals as compared with SC. In the liver, PGE (2) content was also increased (p<0.05) when compared with SC. Endurance training restored maximal CPT I and CPT II activity in the tumor-bearing animals (p<0.0001). Exercise training induced PGE (2) levels to return to control values in the liver of tumor-bearing training rats (p<0.05) and decreased the eicosanoid content in the tumor (p<0.01). In conclusion, endurance training was capable of reestablishing liver carnitine palmitoyltransferase (CPT) system activity associated with decreased PGE (2) levels in cachectic tumor-bearing animals, preventing steatosis.
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Sumi T, Yamashita A, Matsuda S, Goto S, Nishihira K, Furukoji E, Sugimura H, Kawahara H, Imamura T, Kitamura K, Tamura S, Asada Y. Disturbed blood flow induces erosive injury to smooth muscle cell-rich neointima and promotes thrombus formation in rabbit femoral arteries. J Thromb Haemost 2010; 8:1394-402. [PMID: 20230423 DOI: 10.1111/j.1538-7836.2010.03843.x] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
BACKGROUND Plaque erosion is a cause of atherothrombosis that preferentially occurs on smooth muscle cell (SMC)- and proteoglycan-rich rather than lipid-rich plaques. However, its underlying mechanisms remain unknown. OBJECTIVE To determine whether disturbed blood flow induces erosive injury and thrombus formation on SMC-rich neointima. METHODS Three weeks after balloon injury, SMC-rich neointima with increased tissue factor (TF) activity developed in rabbit femoral arteries that were narrowed with a vascular occluder to disturb blood flow after stenosis. Neointimal injury and thrombus formation were assessed at 15, 30, and 180 min after the vascular narrowing. RESULTS Endothelial detachment, platelet adhesion and neointimal cell apoptosis became evident at the post-stenotic regions of all femoral arteries (n = 5) within 15 min of narrowing. Mural thrombi composed of platelet and fibrin developed after 30 min, and then occlusive thrombi were generated in three out of five vessels after 180 min. The identical vascular narrowing of normal femoral arteries also induced endothelial detachment with small platelet thrombi at post-stenotic regions, but fibrin and occlusive thrombi did not develop. Computational simulation analysis indicated that oscillatory shear stress contributes to the development of erosive damage to the neointima. CONCLUSIONS These results suggest that disturbed post-stenotic blood flow can induce erosive injury in SMC-rich plaques and promote thrombus formation that results in vascular events.
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Harada K, Ishida K, Yamashita A, Yoshimura M, Matsumoto M, Sakabe T. [Hypertension and tachycardia during endoscopic radial artery harvesting in two patients undergoing coronary artery bypass grafting]. MASUI. THE JAPANESE JOURNAL OF ANESTHESIOLOGY 2009; 58:745-748. [PMID: 19522268] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Hypertension and tachycardia occurred during endoscopic radial artery harvesting in two patients undergoing coronary artery bypass grafting. Despite anesthesia maintained with moderate doses of fentanyl and isoflurane, hypertension and tachycardia occurred 10-15 min after tourniquet application and graft harvesting procedure. Tourniquet pain or direct stimulation to radial nerve by CO2 insufflation might be the causes. Although endoscopic radial artery harvesting is reported excellent for cosmetics with low incidence of complications such as infection and hematoma, hemodynamic change can occur during harvesting. Careful evaluation and management of hemodynamic changes should be exercised during this procedure in the patient with unstable angina and low cardiac function.
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Shirasawa Y, Matsumoto M, Yoshimura M, Yamashita A, Fukuda S, Ishida K, Sakabe T. Does high-dose opioid anesthesia exacerbate ischemic spinal cord injury in rabbits? J Anesth 2009; 23:242-8. [PMID: 19444564 DOI: 10.1007/s00540-009-0741-8] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2008] [Accepted: 01/19/2009] [Indexed: 01/01/2023]
Abstract
PURPOSE Intrathecal morphine given during a post-ischemic period has been reported to have the potential to exacerbate ischemic spinal cord injury. However, it remains unknown whether synthetic opioids administered systemically exacerbate ischemic injury. We sought to compare the damage of the spinal cord after transient spinal cord ischemia in rabbits anesthetized with three different regimens; isoflurane, fentanyl with isoflurane, and remifentanil with isoflurane. METHODS We assigned rabbits to three groups (n = 9 in each); an isoflurane group (isoflurane 1 minimum alveolar concentration [MAC]), a fentanyl group (isoflurane 0.5 MAC + 100 microg x kg(-1) i.v. fentanyl given over 30 min before aortic occlusion), and a remifentanil group (isoflurane 0.5 MAC + 1 microg x kg(-1) x min(-1) i.v. remifentanil started 30 min before aortic occlusion and maintained until 1 h after reperfusion). Spinal cord ischemia was produced by occluding the abdominal aorta for 13 min. Hindlimb motor function (score range: 4, normal to 0, paraplegia) was assessed daily for 7 days, and then the number of normal neurons in the anterior spinal cord was counted. RESULTS Severe motor dysfunction (score < or = 1) was observed in seven, four, and five animals in the isoflurane, fentanyl, and remifentanil groups, respectively. There were no significant intergroup differences in neurological scores. There were no differences in the numbers of normal neurons among the three groups (22 +/- 22, 42 +/- 30, 33 +/- 28, respectively). CONCLUSION Our results suggest that neither i.v. fentanyl nor i.v. remifentanil added to 0.5 MAC isoflurane exacerbated ischemic spinal cord injury in rabbits when compared to 1 MAC isoflurane.
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Oka S, Toshida T, Maruyama K, Nakajima K, Yamashita A, Sugiura T. 2-Arachidonoyl-sn-glycero-3-phosphoinositol: A Possible Natural Ligand for GPR55. J Biochem 2008; 145:13-20. [DOI: 10.1093/jb/mvn136] [Citation(s) in RCA: 142] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Yamashita A, Soga Y, Iwamoto Y, Asano T, Li Y, Abiko Y, Nishimura F. DNA microarray analyses of genes expressed differentially in 3T3-L1 adipocytes co-cultured with murine macrophage cell line RAW264.7 in the presence of the toll-like receptor 4 ligand bacterial endotoxin. Int J Obes (Lond) 2008; 32:1725-9. [PMID: 18779827 DOI: 10.1038/ijo.2008.153] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Recent studies have suggested that macrophages were integrated into adipose tissues to interact with adipocytes, thereby exacerbating inflammatory responses. Furthermore, both adipocytes and macrophages appear to express toll-like receptor-4 (TLR-4), and free fatty acids may stimulate cells through TLR-4. Herein, we analyzed genes differentially expressed in adipocytes when co-cultured with macrophages in the presence of a ligand for TLR-4, bacterial lipopolysaccharide (LPS). RAW264.7, a murine macrophage cell line and differentiated 3T3-L1 adipocytes were co-cultured using a transwell system. Genes differentially expressed in adipocytes were analyzed by the DNA microarray method following 4, 8, 12 and 24 h stimulation with 1 ng ml(-1) of Escherichia coli LPS. Randomly selected genes with high expressions were confirmed by quantitative methods at both the gene and the protein level. Co-culture of macrophages and adipocytes with a low LPS concentration (1 ng ml(-1)) markedly upregulated gene expressions associated with inflammation and/or angiogenesis, such as those of interleukin-6 (IL-6), MCP-1, RANTES and CXCL1/KC, in adipocytes. Furthermore, several genes associated with insulin resistance were differentially expressed. Upregulations of genes encoding MCP-1, RANTES and CXC/KC were confirmed by quantitative methods. These results suggest that ligands for TLR-4 stimulate both adipocytes and macrophages to upregulate the expressions of many genes associated with inflammation and/or angiogenesis.
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Miyaura K, Morita M, Matsuka Y, Yamashita A, Watanabe T. Rehabilitation of biting abilities in patients with different types of dental prostheses. J Oral Rehabil 2008. [DOI: 10.1111/j.1365-2842.2000.00620.x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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