1
|
Shi Y, Lu Y, Zhang RD, Zhang YY, Lin W, Yu JJ, Wu Y, Fan J, Qi PJ, Huang PL, Cai LX, Huang Q, Zhang P, Sun YM, Liu Y, Zheng HY. [Clinical characteristics and prognosis of 28 cases of infant acute lymphoblastic leukemia]. Zhonghua Er Ke Za Zhi 2024; 62:49-54. [PMID: 38154977 DOI: 10.3760/cma.j.cn112140-20230720-00020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Subscribe] [Scholar Register] [Indexed: 12/30/2023]
Abstract
Objective: To analyze the clinical characteristics and prognosis of patients with infant acute lymphoblastic leukemia (IALL). Methods: A retrospective cohort study.Clinical data, treatment and prognosis of 28 cases of IALL who have been treated at Beijing Children's Hospital, Capital Medical University and Baoding Children's Hospital from October 2013 to May 2023 were analyzed retrospectively. Based on the results of fluorescence in situ hybridization (FISH), all patients were divided into KMT2A gene rearrangement (KMT2A-R) positive group and KMT2A-R negative group. The prognosis of two groups were compared. Kaplan-Meier method and Log-Rank test were used to analyze the survival of the patients. Results: Among 28 cases of IALL, there were 10 males and 18 females, with the onset age of 10.9 (9.4,11.8) months. In terms of immune classification, 25 cases were B-ALL (89%), while the remaining 3 cases were T-ALL (11%). Most infant B-ALL showed pro-B lymphocyte phenotype (16/25,64%). A total of 22 cases (79%) obtained chromosome karyotype results, of which 7 were normal karyotypes, no complex karyotypes and 15 were abnormal karyotypes were found. Among abnormal karyotypes, there were 4 cases of t (9; 11), 2 cases of t (4; 11), 2 cases of t (11; 19), 1 case of t (1; 11) and 6 cases of other abnormal karyotypes. A total of 19 cases (68%) were positive for KMT2A-R detected by FISH. The KMT2A fusion gene was detected by real-time PCR in 16 cases (57%). A total of 24 patients completed standardized induction chemotherapy and were able to undergo efficacy evaluation, 23 cases (96%) achieved complete remission through induction chemotherapy, 4 cases (17%) died of relapse. The 5-year event free survival rate (EFS) was (46±13)%, and the 5-year overall survival rate (OS) was (73±10)%.The survival time was 31.3 (3.3, 62.5) months. There was no significant statistical difference in 5-year EFS ((46±14)% vs. (61±18)%) and 5-year OS ((64±13)% vs. (86±13)%) between the KMT2A-R positive group (15 cases) and the KMT2A-R negative group (9 cases) (χ2=1.88, 1.47, P=0.170, 0.224). Conclusions: Most IALL patients were accompanied by KMT2A-R. They had poor tolerance to traditional chemotherapy, the relapse rate during treatment was high and the prognosis was poor.
Collapse
Affiliation(s)
- Y Shi
- Hematology Center, Beijing Children's Hospital, Capital Medical University, National Center for Children's Health, Beijing Key Laboratory of Pediatric Hematology Oncology, National Key Clinical Discipline of Pediatric Hematology, National Key Discipline of Pediatrics, Key Laboratory of Major Diseases in Children, Ministry of Education, Beijing 100045, China
| | - Y Lu
- Hematology Oncology Center, Baoding Children's Hospital,Baoding Key Laboratory of Precision Medicine for Pediatric Hematology Oncology, Hematology Oncology Center of National Center for Children's Health in Baoding, Baoding 071027, China
| | - R D Zhang
- Hematology Center, Beijing Children's Hospital, Capital Medical University, National Center for Children's Health, Beijing Key Laboratory of Pediatric Hematology Oncology, National Key Clinical Discipline of Pediatric Hematology, National Key Discipline of Pediatrics, Key Laboratory of Major Diseases in Children, Ministry of Education, Beijing 100045, China
| | - Y Y Zhang
- Hematology Center, Beijing Children's Hospital, Capital Medical University, National Center for Children's Health, Beijing Key Laboratory of Pediatric Hematology Oncology, National Key Clinical Discipline of Pediatric Hematology, National Key Discipline of Pediatrics, Key Laboratory of Major Diseases in Children, Ministry of Education, Beijing 100045, China
| | - W Lin
- Hematology Center, Beijing Children's Hospital, Capital Medical University, National Center for Children's Health, Beijing Key Laboratory of Pediatric Hematology Oncology, National Key Clinical Discipline of Pediatric Hematology, National Key Discipline of Pediatrics, Key Laboratory of Major Diseases in Children, Ministry of Education, Beijing 100045, China
| | - J J Yu
- Hematology Center, Beijing Children's Hospital, Capital Medical University, National Center for Children's Health, Beijing Key Laboratory of Pediatric Hematology Oncology, National Key Clinical Discipline of Pediatric Hematology, National Key Discipline of Pediatrics, Key Laboratory of Major Diseases in Children, Ministry of Education, Beijing 100045, China
| | - Y Wu
- Hematology Center, Beijing Children's Hospital, Capital Medical University, National Center for Children's Health, Beijing Key Laboratory of Pediatric Hematology Oncology, National Key Clinical Discipline of Pediatric Hematology, National Key Discipline of Pediatrics, Key Laboratory of Major Diseases in Children, Ministry of Education, Beijing 100045, China
| | - J Fan
- Hematology Center, Beijing Children's Hospital, Capital Medical University, National Center for Children's Health, Beijing Key Laboratory of Pediatric Hematology Oncology, National Key Clinical Discipline of Pediatric Hematology, National Key Discipline of Pediatrics, Key Laboratory of Major Diseases in Children, Ministry of Education, Beijing 100045, China
| | - P J Qi
- Hematology Center, Beijing Children's Hospital, Capital Medical University, National Center for Children's Health, Beijing Key Laboratory of Pediatric Hematology Oncology, National Key Clinical Discipline of Pediatric Hematology, National Key Discipline of Pediatrics, Key Laboratory of Major Diseases in Children, Ministry of Education, Beijing 100045, China
| | - P L Huang
- Hematology Center, Beijing Children's Hospital, Capital Medical University, National Center for Children's Health, Beijing Key Laboratory of Pediatric Hematology Oncology, National Key Clinical Discipline of Pediatric Hematology, National Key Discipline of Pediatrics, Key Laboratory of Major Diseases in Children, Ministry of Education, Beijing 100045, China
| | - L X Cai
- Hematology Oncology Center, Baoding Children's Hospital,Baoding Key Laboratory of Precision Medicine for Pediatric Hematology Oncology, Hematology Oncology Center of National Center for Children's Health in Baoding, Baoding 071027, China
| | - Q Huang
- Hematology Oncology Center, Baoding Children's Hospital,Baoding Key Laboratory of Precision Medicine for Pediatric Hematology Oncology, Hematology Oncology Center of National Center for Children's Health in Baoding, Baoding 071027, China
| | - P Zhang
- Hematology Oncology Center, Baoding Children's Hospital,Baoding Key Laboratory of Precision Medicine for Pediatric Hematology Oncology, Hematology Oncology Center of National Center for Children's Health in Baoding, Baoding 071027, China
| | - Y M Sun
- Hematology Oncology Center, Baoding Children's Hospital,Baoding Key Laboratory of Precision Medicine for Pediatric Hematology Oncology, Hematology Oncology Center of National Center for Children's Health in Baoding, Baoding 071027, China
| | - Y Liu
- Hematology Oncology Center, Baoding Children's Hospital,Baoding Key Laboratory of Precision Medicine for Pediatric Hematology Oncology, Hematology Oncology Center of National Center for Children's Health in Baoding, Baoding 071027, China
| | - H Y Zheng
- Hematology Center, Beijing Children's Hospital, Capital Medical University, National Center for Children's Health, Beijing Key Laboratory of Pediatric Hematology Oncology, National Key Clinical Discipline of Pediatric Hematology, National Key Discipline of Pediatrics, Key Laboratory of Major Diseases in Children, Ministry of Education, Beijing 100045, China
| |
Collapse
|
2
|
Shen X, Chang LG, Hu MY, Yan D, Zhou LN, Ma Y, Ling SK, Fu YQ, Zhang SY, Kong B, Huang PL. KrasG12D-LOH promotes malignant biological behavior and energy metabolism of pancreatic ductal adenocarcinoma cells through the mTOR signaling pathway. Neoplasma 2019; 65:81-88. [PMID: 29322792 DOI: 10.4149/neo_2018_170224n142] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Oncogenic Kras with loss of heterozygosity (LOH) is frequently detected in various tumours. However, the exact function and mechanism by which KrasG12D-LOH operates remain unclear. Therefore, the current study investigated the effect of KrasG12D-LOH on the malignant phenotype of pancreatic ductal adenocarcinoma (PDAC) cells. Our investigation revealed that KrasG12D-LOH is associated with increased proliferation, invasion and reduced apoptosis in PDAC cells. The results also exhibited enhanced glycolytic phenotype of KrasG12D-LOH PDAC cells. Hyperactive mTOR plays a significant role in the initiation and maintenance of tumors. To investigate the correlation between KrasG12D-LOH and mTOR, the mTOR signaling pathway was detected by western blot analysis. We found that KrasG12D-LOH up-regulated Akt, AMPK, REDD1 and mTOR in PDAC cells. In summary, our results demonstrated that KrasG12D-LOH promotes oncogenic Kras-induced PDAC by regulating energy metabolism and mTOR signaling pathway. These data may provide novel therapeutic perspectives for PDAC.
Collapse
|
3
|
Xie GY, Chen W, Wang QK, Cheng XR, Xu JN, Huang PL. [Oxidative damage effects induced by CdTe quantum dots in mice]. Zhonghua Lao Dong Wei Sheng Zhi Ye Bing Za Zhi 2018; 35:487-490. [PMID: 29081095 DOI: 10.3760/cma.j.issn.1001-9391.2017.07.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Objective: To investigate Oxidative damage effects induced by CdTe Quantum Dots (QDs) in mice. Methods: 40 ICR mice were randomly divided into 5 groups: one control group (normal saline) ; four CdTe QDs (exposed by intravenous injection of 0.2 ml of CdTe QDs at the concentration of 0、0.5、5.0、50.0 and 500.0 nmol/ml respectively) . After 24 h, the mice were decapitated and the blood was collected for serum biochemically indexes、hematology indexes, the activities of SOD、GSH-Px and the concentration of MDA were all detected. Results: The results showed in the four CdTe QDs exposure groups, the level of CRE、PLT and the concentration of MDA were all significantly lower than those of the control group (P<0.05 or P<0.01) ; the activities GSH-Px in 50.0 and 500.0 nmol/ml CdTe QDs group were significantly higher than those of control group (P<0.01) . Conclusion: It was suggested that CdTe QDs at 0.5 nmol/ml could induce Oxidative damage effects in mice.
Collapse
Affiliation(s)
- G Y Xie
- National Insititue of Occupational Health and Poison Control, Chinese Center for Disease Control and Prevention, Beijing 100050, China
| | | | | | | | | | | |
Collapse
|
4
|
Pong YH, Chang CJ, Tsai VFS, Tsai DC, Tsai JH, Lee IC, Huang PL. Genital Tuberculosis Presenting as Acute Scrotum Mimicking Fournier's Gangrene. HONG KONG J EMERG ME 2017. [DOI: 10.1177/102490791302000509] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Genital tuberculosis usually presents as local symptoms such as lower abdominal pain and a sensation of scrotal bloating. We report a rare case of genital tuberculosis in a 46-year-old man presenting with symptoms that mimic Fournier's gangrene. He had a progressive local symptoms of scrotal tenderness, redness, swelling, and local rise in temperature. The patient underwent emergency open debridement, and pathology confirmed tuberculosis infection. Recovery was uneventful after 6 months of anti-tuberculosis drug treatment. Literature of genital tuberculosis is also reviewed.
Collapse
|
5
|
Li HL, Hu Y, Meng PJ, Zhang XY, Xie YY, Huang PL. [Size exclusionchromatography-high-performance liquid chromatography-inductively coupled plasma mass spectrometry for measuring the stability of cadmium telluridequantum dots]. Zhonghua Lao Dong Wei Sheng Zhi Ye Bing Za Zhi 2017; 35:217-220. [PMID: 28511312 DOI: 10.3760/cma.j.issn.1001-9391.2017.03.016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Objective: To investigate the peak time and peak area of elements in cadmium telluride quantum dots (CdTe QDs) using size exclusion chromatography-high-performance liquid chromatography-inductively coupled plasma mass spectrometry, as well as the biological stability of CdTe QDs in vivo and in vitro. Methods: Transmission electron microscope and ultraviolet fluorescence were used for characterization and synthesis of water-soluble CdTe QDs, and CdTe QDs were added to double-distilled water, mobile phase, or bovine serum medium to observe the change in stability after different periods of time. CdTe QDs were injected into the vein of mice, and the changes in the morphology of CdTe QDs in serum and the liver were measured at 1, 24, and 72 hours after exposure. Size exclusion chromatography-high-performance liquid chromatography was used for the elution of the compounds in the solution based on their volume, and then inductively coupled plasma mass spectrometry was performed for the eluent. The flow time of (114)Cd and (130)Te and molar ratio were used for qualitative analysis of CdTe QDs, and the peak area was used to judge whether CdTe QDs were degraded. Results: CdTe QDs were diluted to a concentration of 0.5 mmol/L with double-distilled water and then placed in a dark place at room temperature; CdTe QDs were completely degraded after 60 minutes. CdTe QDs were diluted to a concentration of 0.005 mmol/L with a mobile phase, and the peak of CdTe QDs was not detected. After CdTe QDs were placed in a dark place at room temperature for 48 hours at a concentration of 0.005 mmol/L in bovine serum mediumin vitro, the peak area of (114)Cd was 6179841-7346084, and the peak area of (130)Te was 1077913-1191066. CdTe QDs had the highest peak area at 1 hour after exposure, and the peak areas of (114)Cd and (130)Te were 18183894 and 25187987, respectively. CdTe QDs were quickly degraded in the liver; at 1 hour after exposure, the degradation products of CdTe QDs containing Cd were observed in liver tissue homogenate, and CdTe QDs were largely degradedat 24 hours. Conclusion: This method can be used to investigate the biological stability of CdTe QDs. CdTe QDs are degraded in the liver and produce Cd(2+), which may cause toxic reaction.
Collapse
Affiliation(s)
- H L Li
- Capital Medical University School of Public Health, Beijing 100069, China
| | | | | | | | | | | |
Collapse
|
6
|
Kim YR, Tejima E, Huang S, Atochin DN, Dai G, Lo EH, Huang PL, Bogdanov A, Rosen BR. In vivo quantification of transvascular water exchange during the acute phase of permanent stroke. Magn Reson Med 2009; 60:813-21. [PMID: 18816832 DOI: 10.1002/mrm.21708] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Mechanisms that underlie early ischemic damages to the blood-brain-barrier (BBB) are not well understood. This study presents a novel magnetic resonance imaging (MRI) technique using a widely available pulse sequence and a long-circulating intravascular contrast agent to quantify water movements across the BBB at early stages of stroke progression. We characterized the integrity of the BBB by measuring the flip angle dependence of the water exchange-affected MRI signal intensity, to generate an efficient quantitative index of vascular permeability (WEI, or water exchange index). We performed in vivo MRI experiments to measure the transvascular WEI immediately after the permanent filament occlusion of the middle cerebral artery of mice (n = 5), in which we monitored changes in blood volume (V(b)), apparent diffusion coefficient (ADC), and intra-/extravascular WEI for 4 hours. Statistically significant elevations (P < 0.05) of WEI in the ischemic tissue were observed as early as 1 hour after ischemic onset. Initial reduction of the apparent blood volume (V(app)) in the infarct cortex was followed by a continuous increase of V(app) over time. Although the measured ADC in the ipsilesional cortex continuously decreased, the abnormally high intra-/extravascular WEI remained constant at a significantly elevated level, indicating apparent BBB injury at this early stage of stroke.
Collapse
Affiliation(s)
- Y R Kim
- Athinoula A. Martinos Center for Biomedical Imaging/Radiology, Massachusetts General Hospital, Charleston, Massachusetts 02129, USA.
| | | | | | | | | | | | | | | | | |
Collapse
|
7
|
Kuhlencordt PJ, Padmapriya P, Rützel S, Schödel J, Hu K, Schäfer A, Huang PL, Ertl G, Bauersachs J. Ezetimibe potently reduces vascular inflammation and arteriosclerosis in eNOS-deficient ApoE ko mice. Atherosclerosis 2008; 202:48-57. [PMID: 18479686 DOI: 10.1016/j.atherosclerosis.2008.03.021] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/18/2007] [Revised: 03/13/2008] [Accepted: 03/16/2008] [Indexed: 10/22/2022]
Abstract
OBJECTIVE Hypercholesterolemia is associated with decreased vascular nitric oxide bioavailability and deletion of endothelial nitric oxide synthase (eNOS) markedly accelerates atherosclerosis development in apolipoprotein E knockout (apoE ko) mice. The current study tests whether atheroprotection provided by a lipid lowering therapy with Ezetimibe depends on eNOS. METHODS/RESULTS ApoE ko and apoE/eNOS double ko (dko) mice received a high fat diet with or without 0.05% Ezetimibe. Ezetimibe significantly reduced plasma cholesterol concentrations and atherogenic lipoproteins in both genotypes to a similar extent. Moreover, the drug reduced vascular inflammation, as it significantly reduced vascular cell adhesion molecule-1 (VCAM-1) expression and vascular CD14 expression, a marker for mononuclear cell infiltration, in both genotypes. Neither NOS protein expression nor vascular reactivity of aortic rings was changed in apoE ko mice following Ezetimibe treatment. Significant lesion reduction was seen in Ezetimibe-treated male and female apoE ko and apoE/eNOS dko animals (p<or=0.05). Interestingly, the drug-mediated additional atheroprotection in male apoE ko, compared to male eNOS dko mice, suggesting that lipid lowering does provide additional eNOS-dependent atheroprotection in this experimental group. CONCLUSION Lipid lowering with Ezetimibe potently reduces atherosclerosis and vascular inflammation independent of eNOS. Moreover, Ezetimibe did not exert any effects on eNOS protein expression or enzyme activity. However, additional atheroprotection by Ezetimibe was observed in eNOS competent apoE ko mice, suggesting that some of the drug's anti-atherosclerotic effects are mediated by the eNOS pathway.
Collapse
Affiliation(s)
- Peter J Kuhlencordt
- Medizinische Klinik I/Herz-Kreislaufzentrum, Universitätsklinikum, Julius-Maximilians-Universität-Würzburg, Josef-Schneider-Str. 2, D97080 Würzburg, Germany.
| | | | | | | | | | | | | | | | | |
Collapse
|
8
|
Lee SR, Lok J, Rosell A, Kim HY, Murata Y, Atochin D, Huang PL, Wang X, Ayata C, Moskowitz MA, Lo EH. Reduction of hippocampal cell death and proteolytic responses in tissue plasminogen activator knockout mice after transient global cerebral ischemia. Neuroscience 2007; 150:50-7. [PMID: 17936515 DOI: 10.1016/j.neuroscience.2007.06.029] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2007] [Revised: 06/08/2007] [Accepted: 07/10/2007] [Indexed: 10/22/2022]
Abstract
Knockout mice deficient in tissue plasminogen activator (tPA) are protected against hippocampal excitotoxicity. But it is unknown whether similar neuroprotection occurs after transient global cerebral ischemia, which is known to selectively affect the hippocampus. In this study, we tested the hypothesis that hippocampal cell death in tPA knockout mice would be reduced after transient global cerebral ischemia, and this neuroprotection would occur concomitantly with amelioration of both intra- and extracellular proteolytic cascades. Wild-type and tPA knockout mice were subjected to 20 min of transient bilateral occlusions of the common carotid arteries. Three days later, Nissl and terminal deoxynucleotidyl transferase biotin-dUTP nick end labeling staining demonstrated that hippocampal cell death was significantly reduced in tPA knockout brains compared with wild-type brains. Caspase-3 and the two major brain gelatinases (matrix metalloproteinase (MMP)-9 and MMP-2) were assessed as representative measurements of intra- and extracellular proteolysis. Post-ischemic levels of caspase-3, MMP-9 and MMP-2 were similarly reduced in tPA knockouts compared with wild-type hippocampi. Taken together, these data suggest that endogenous tPA contributes to hippocampal injury after cerebral ischemia, and these pathophysiologic pathways may involve links to aberrant activation of caspases and MMPs.
Collapse
Affiliation(s)
- S-R Lee
- Neuroprotection Research Laboratory, Department of Radiology, Massachusetts General Hospital, Harvard Medical School, Boston, MA 02129, USA
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
9
|
Atochin DN, Murciano JC, Gürsoy-Ozdemir Y, Krasik T, Noda F, Ayata C, Dunn AK, Moskowitz MA, Huang PL, Muzykantov VR. Mouse Model of Microembolic Stroke and Reperfusion. Stroke 2004; 35:2177-82. [PMID: 15256680 DOI: 10.1161/01.str.0000137412.35700.0e] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
BACKGROUND AND PURPOSE To test the role of fibrinolysis in stroke, we used a mouse model in which preformed 2.5- to 3-microm-diameter fibrin microemboli are injected into the cerebral circulation. The microemboli lodge in the downstream precapillary vasculature and are susceptible to fibrinolysis. METHODS We injected various doses of microemboli into the internal carotid artery in mice and characterized their distribution, effects on cerebral blood flow, neurological deficit, infarct area, and spontaneous dissolution. By comparing wild-type and tissue plasminogen activator (tPA) knockout (tPA-/-) mice, we analyzed the role of endogenous tPA in acute thrombotic stroke. RESULTS Microemboli cause dose-dependent brain injury. Although moderate doses of microemboli are followed by spontaneous reperfusion, they result in reproducible injury. Gene knockout of tPA markedly delays dissolution of cerebral emboli and restoration of blood flow and aggravates ischemic thrombotic infarction in the brain. CONCLUSIONS We describe a microembolic model of stroke, in which degree of injury can be controlled by the dose of microemboli injected. Unlike vessel occlusion models, this model can be modulated to allow spontaneous fibrinolysis. Application to tPA-/- mice supports a key role of endogenous tPA in restoring cerebral blood flow and limiting infarct size after thrombosis.
Collapse
Affiliation(s)
- D N Atochin
- Cardiovascular Research Center, Massachusetts General Hospital, Charlestown, Massachusetts 02129, USA
| | | | | | | | | | | | | | | | | | | |
Collapse
|
10
|
Atochin DN, Demchenko IT, Astern J, Boso AE, Piantadosi CA, Huang PL. Contributions of endothelial and neuronal nitric oxide synthases to cerebrovascular responses to hyperoxia. J Cereb Blood Flow Metab 2003; 23:1219-26. [PMID: 14526232 DOI: 10.1097/01.wcb.0000089601.87125.e4] [Citation(s) in RCA: 77] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
Hyperoxia causes a transient decrease in CBF, followed by a later rise. The mediators of these effects are not known. We used mice lacking endothelial or neuronal nitric oxide synthase (NOS) isoforms (eNOS-/- and nNOS-/- mice) to study the roles of the NOS isoforms in mediating changes in cerebral vascular tone in response to hyperoxia. Resting regional cerebral blood flow (rCBF) did not differ between wild type (WT), eNOS-/- mice, and nNOS-/- mice. eNOS-/- mice showed decreased cerebrovascular reactivities to NG-nitro-L-arginine methyl ester (L-NAME), PAPA NONOate, acetylcholine (Ach), and SOD1. In response to hyperbaric oxygen (HBO2) at 5 ATA, WT and nNOS-/- mice showed decreases in rCBF over 30 minutes, but eNOS-/- mice did not. After 60 minutes HBO2, rCBF increased more in WT mice than in eNOS-/- or nNOS-/- mice. Brain NO-metabolites (NOx) decreased in WT and eNOS-/- mice within 30 minutes of HBO2, but after 45 minutes, NOx rose above control levels, whereas they did not change in nNOS-/- mice. Brain 3NT increased during HBO2 in WT and eNOS-/- but did not change in nNOS-/- mice. These results suggest that modulation of eNOS-derived NO by HBO2 is responsible for the early vasoconstriction responses, whereas late HBO2-induced vasodilation depends upon both eNOS and nNOS.
Collapse
Affiliation(s)
- D N Atochin
- Cardiovascular Research Center, Massachusetts General Hospital, Charlestown, Massachusetts 02129, USA
| | | | | | | | | | | |
Collapse
|
11
|
Chung MI, Han FW, Lin HC, Liou SS, Huang PL, Ko HH, Chang YL, Kang JJ, Teng CM, Lin CN. Synthesis, antiplatelet and vasorelaxing effects of monooxygenated flavones and flavonoxypropanolamines. J Pharm Pharmacol 2001; 53:1601-9. [PMID: 11804390 DOI: 10.1211/0022357011778205] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
Abstract
A series of flavones and flavonoxypropanolamines were synthesized and tested in-vitro for their ability to inhibit aggregation of washed rabbit platelets and human platelet-rich plasma (PRP), and for vasoconstriction of rat thoracic aorta. The various substituted positions of the hydroxyl group in flavone ring B and the various oxypropanolamine side chains substituted at position C-2' of flavone modified the antiplatelet effects. All the compounds tested in human PRP showed significant inhibition of secondary aggregation induced by adrenaline (epinephrine), suggesting that the antiplatelet effect of these compounds is mainly due to an inhibitory effect on thromboxane formation. Compounds 11 and 12 also had potent vasorelaxant effects in rat thoracic aorta. Phenylephrine- and high-K+-induced 45Ca2+ influx in aorta were both inhibited by the selected compound 11. This result indicates that the inhibitory effect of 11 on the contractile response caused by high-K+ medium and noradrenaline (norepinephrine) in rat thoracic aorta is mainly due to inhibition of Ca2+ influx through both voltage-dependent and receptor-operated Ca2+ channels.
Collapse
Affiliation(s)
- M I Chung
- School of Pharmacy, Kaohsiung Medical University, Taiwan, Republic of China.
| | | | | | | | | | | | | | | | | | | |
Collapse
|
12
|
Chen J, Kuhlencordt PJ, Astern J, Gyurko R, Huang PL. Hypertension does not account for the accelerated atherosclerosis and development of aneurysms in male apolipoprotein e/endothelial nitric oxide synthase double knockout mice. Circulation 2001; 104:2391-4. [PMID: 11705813 DOI: 10.1161/hc4501.099729] [Citation(s) in RCA: 107] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
BACKGROUND Apolipoprotein E (apoE)/endothelial nitric oxide synthase (eNOS) double knockout (DKO) mice demonstrate accelerated atherosclerosis and develop abdominal aortic aneurysms and aortic dissection, suggesting a role for eNOS in suppressing atherogenesis. To test whether accelerated atherosclerosis and aortic aneurysms were due to hypertension, we administered hydralazine to male apoE/eNOS DKO mice to reduce blood pressure. METHODS AND RESULTS Male apoE/eNOS DKO mice were treated with hydralazine in their drinking water (250 mg/L) using a dose that lowers the blood pressure to levels seen in apoE KO mice. The mice were fed a Western-type diet for 16 weeks, and lesion formation was assessed by inspection of the vessel and staining with Sudan IV. Hydralazine-treated, normotensive male apoE/eNOS DKO mice developed increased aortic lesion areas (30.0+/-2.8%, n=11) compared with male apoE KO mice (14.6+/-0.8%, n=7). The extent of lesion formation was not significantly different from male apoE/eNOS DKO mice that were not given hydralazine (28.3+/-3.1%, n=9). Four of 11 hydralazine-treated male apoE/eNOS DKO mice developed abdominal aortic aneurysms. CONCLUSIONS Hypertension is not required for the accelerated atherosclerosis seen in apoE/eNOS DKO animals, and control of hypertension during a 16-week period does not prevent aortic aneurysm formation.
Collapse
Affiliation(s)
- J Chen
- Cardiovascular Research Center and Cardiology Division, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts, USA
| | | | | | | | | |
Collapse
|
13
|
Koedel U, Paul R, Winkler F, Kastenbauer S, Huang PL, Pfister HW. Lack of endothelial nitric oxide synthase aggravates murine pneumococcal meningitis. J Neuropathol Exp Neurol 2001; 60:1041-50. [PMID: 11706934 DOI: 10.1093/jnen/60.11.1041] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Nitric oxide (NO) plays a central role in the pathogenesis of bacterial meningitis. However, the role of NO produced by endothelial NO synthase (eNOS) in meningitis is still unclear. We investigated the influence of eNOS depletion on the inflammatory host response, intracranial complications, and outcome in experimental pneumococcal meningitis. Leukocyte accumulation in the cerebrospinal fluid was more pronounced in infected eNOS-deficient mice than in infected wild type mice. This effect could be attributed to an increased expression of P-selectin, macrophage inflammatory protein-2, keratinocyte-derived cytokine, and interleukin (IL)-1beta in the brain of infected eNOS-deficient mice. However, no differences in the cerebral expression of intercellular adhesion molecule-1, tumor necrosis factor-alpha, and IL-6 as well as of neuronal NOS and inducible NOS could be detected between infected wild type and mutant mice. In addition to enhanced leukocyte infiltration into the CSF, meningitis-associated intracranial complications including blood-brain barrier disruption and the rise in intracranial pressure were significantly augmented in infected eNOS-deficient mice. The aggravation of intracranial complications was paralleled by a worsening of the disease, as evidenced by a more pronounced hypothermia, an enhanced weight reduction, and an increased death rate. The current data indicate that eNOS deficiency is detrimental in bacterial meningitis. This effect seems to be related to an increased expression of (certain) cytokines/chemokines and adhesion molecules; thus leading to increased meningeal inflammation and, subsequently, to aggravated intracranial complications.
Collapse
Affiliation(s)
- U Koedel
- Department of Neurology, Klinikum Grosshadern, Ludwig-Maximilians University of Munich, Germany
| | | | | | | | | | | |
Collapse
|
14
|
Sun Y, Huang PL, Li JJ, Huang YQ, Zhang L, Huang PL, Lee-Huang S. Anti-HIV agent MAP30 modulates the expression profile of viral and cellular genes for proliferation and apoptosis in AIDS-related lymphoma cells infected with Kaposi's sarcoma-associated virus. Biochem Biophys Res Commun 2001; 287:983-94. [PMID: 11573962 DOI: 10.1006/bbrc.2001.5689] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The anti-HIV agent MAP30 (Momordica anti-HIV protein, 30 kDa) inhibits the proliferation of BC-2, an AIDS-related primary effusion lymphoma (PEL) cell line derived from an AIDS patient. BC-2 cells are latently infected with Kaposi's sarcoma-associated herpes virus (KSHV), also known as human herpes virus 8 (HHV8). We examined the effect of MAP30 on the expression of viral and cellular genes in BC-2 during latent and lytic states of the viral life cycle. By Northern analysis and RT-PCR, we found that MAP30 downregulates the expression of viral cyclin D (vCD), viral interleukin-6 (vIL-6), and viral FLIP (vFLIP), genes involved in cell cycle regulation, viral pathogenesis, and apoptosis. By pathway-specific cDNA microarray analysis, we found that BC-2 cells express high levels of egr-1, ATF-2, hsp27, hsp90, IkappaB, mdm2, skp1, and IL-2, cellular genes involved in mitogenesis, tumorigenesis, and inhibition of apoptosis in NFkappaB and p53 signaling pathways. These results define for the first time the specific cellular pathways involved in AIDS-related tumorigenesis and suggest specific novel targets for the treatment. Furthermore, we found that MAP30 downregulates the expression of egr-1, ATF-2, hsp27, hsp90, IkappaB, mdm2, and Skp1, while it upregulates the pro-apoptotic-related genes Bax, CRADD, and caspase-3. Thus, MAP30 modulates the expression of both viral and cellular genes involved in KS pathogenesis. These results provide valuable insight into the molecular mechanisms of MAP30 anti-KS action and suggest its utility as a therapeutic agent against AIDS-related tumors.
Collapse
Affiliation(s)
- Y Sun
- Department of Biochemistry, New York University School of Medicine, New York, NY 10016, USA
| | | | | | | | | | | | | |
Collapse
|
15
|
Keilhoff G, Seidel B, Reiser M, Stanarius A, Huang PL, Bogerts B, Wolf G, Bernstein HG. Lack of neuronal NOS has consequences for the expression of POMC and POMC-derived peptides in the mouse pituitary. Acta Histochem 2001; 103:397-412. [PMID: 11700945 DOI: 10.1078/0065-1281-00611] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
The relevance of NO in neuroendocrine signalling has been investigated by analysis of cellular expression of pro-opiomelanocortin (POMC) and the POMC-derived peptides beta-endorphin, alpha-melanocyte stimulating hormone and adrenocorticotropin. Expression patterns were studied in the pituitary gland of 150-day old wild-type and neuronal-NOS (nNOS) knock-out mice by using immunohistochemistry, in situ hybridization and Northern blot analysis. Remaining NO-generating capacities in the knock-out mice were demonstrated by immunohistochemical localization of inducible, endothelial and neuronal NOS isoforms. Quantitative analysis revealed that cellular expression of POMC mRNA was drastically reduced in the pituitary of knock-out mice in comparison to controls. In situ hybridization studies demonstrated that this reduction was most pronounced in the intermediate lobe, while the anterior lobe was much less affected. Immunostaining for the proteolytic fragments of POMC was significantly reduced in the intermediate lobe cells of knock-out mice. A moderate reduction of immunostaining for these peptides was also observed in adenopituitary cells of nNOS knock-out mice. Our data demonstrate that the lack of nNOS substantially affects cellular levels of pituitary opioid peptides, which may have consequences for the response of these animals to stress and pain.
Collapse
Affiliation(s)
- G Keilhoff
- Institute of Medical Neurobiology, University of Magdeburg, Germany.
| | | | | | | | | | | | | | | |
Collapse
|
16
|
Elibol B, Söylemezoglu F, Unal I, Fujii M, Hirt L, Huang PL, Moskowitz MA, Dalkara T. Nitric oxide is involved in ischemia-induced apoptosis in brain: a study in neuronal nitric oxide synthase null mice. Neuroscience 2001; 105:79-86. [PMID: 11483302 DOI: 10.1016/s0306-4522(01)00159-2] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Nitric oxide can promote or inhibit apoptosis depending on the cell type and coexisting metabolic or experimental conditions. We examined the impact of nitric oxide on development of apoptosis 6, 24, and 72 h after permanent middle cerebral artery occlusion in mutant mice that lack the ability to generate nitric oxide from neuronal nitric oxide synthase. Adjacent coronal sections passing through the anterior commissure were stained with hematoxylin and eosin or terminal deoxynucleotidyl transferase-mediated dUTP nick end labeling (TUNEL). Immunoblotting was used to identify changes in the anti- and proapoptotic proteins Bcl-2 and Bax, respectively. Activation of caspases was assessed by appearance of actin cleavage products using a novel antiserum directed against 32-kDa actin fragment (fractin). In the neuronal nitric oxide synthase mutant mouse, infarct size and TUNEL positive apoptotic neurons were reduced compared to the wild-type controls. At 6 h, Bcl-2 levels in the ischemic hemisphere were increased in mutants but decreased in the wild-type strain. Bax levels did not change significantly. Caspase-mediated actin cleavage appeared in the ischemic hemisphere at this time point, and was significantly less in mutant brains at 72 h compared to the wild-type. The reduction in the number of TUNEL and fractin positive apoptotic cells appears far greater than anticipated based on the smaller lesion size in mutant mice.Hence, from these data we suggest that a deficiency in neuronal nitric oxide production slows the development of apoptotic cell death after ischemic injury and is associated with preserved Bcl-2 levels and delayed activation of effector caspases.
Collapse
Affiliation(s)
- B Elibol
- Department of Neurology, Faculty of Medicine, and Institute of neurological Sciences and Psychiatry, Hacettepe university, Ankara, Turkey
| | | | | | | | | | | | | | | |
Collapse
|
17
|
Scherrer-Crosbie M, Ullrich R, Bloch KD, Nakajima H, Nasseri B, Aretz HT, Lindsey ML, Vançon AC, Huang PL, Lee RT, Zapol WM, Picard MH. Endothelial nitric oxide synthase limits left ventricular remodeling after myocardial infarction in mice. Circulation 2001; 104:1286-91. [PMID: 11551881 DOI: 10.1161/hc3601.094298] [Citation(s) in RCA: 224] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Background- To investigate the role of endothelial nitric oxide synthase (NOS3) in left ventricular (LV) remodeling after myocardial infarction (MI), the impact of left anterior descending coronary artery ligation on LV size and function was compared in 2- to 4-month-old wild-type (WT) and NOS3-deficient mice (NOS3(-/-)). Methods and Results- Two days after MI, both strains of mice had a similar LV size, fractional shortening, and ejection fraction by echocardiography. Twenty-eight days after MI, both strains had dilated LVs with decreased fractional shortening and lower ejection fractions. Although the infarcted fraction of the LV was similar in both strains, LV end-diastolic internal diameter, end-diastolic volume, and mass were greater, but fractional shortening, ejection fraction, and the maximum rate of developed LV pressure (dP/dt(max)) were lower in NOS3(-/-) than in WT mice. Impairment of diastolic function, as measured by the time constant of isovolumic relaxation (tau) and the maximum rate of LV pressure decay (dP/dt(min)), was more marked in NOS3(-/-) than in WT mice. Mortality after MI was greater in NOS3(-/-) than in WT mice. Long-term administration of hydralazine normalized blood pressure in NOS3(-/-) mice, but it did not prevent the LV dilatation, impaired systolic and diastolic function, and increased LV mass that followed MI. In WT mice, capillary density and myocyte width in the nonischemic portion of the LV did not differ before and 28 days after MI, whereas in NOS3(-/-) mice, capillary density decreased and myocyte width increased after MI, whether or not hydralazine was administered. Conclusions- These results suggest that the presence of NOS3 limits LV dysfunction and remodeling in a murine model of MI by an afterload-independent mechanism, in part by decreasing myocyte hypertrophy in the remote myocardium.
Collapse
Affiliation(s)
- M Scherrer-Crosbie
- Cardiology Division, Cardiovascular Research Center, Department of Medicine, Boston, Massachusetts, USA.
| | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
18
|
Sanz MJ, Hickey MJ, Johnston B, McCafferty DM, Raharjo E, Huang PL, Kubes P. Neuronal nitric oxide synthase (NOS) regulates leukocyte-endothelial cell interactions in endothelial NOS deficient mice. Br J Pharmacol 2001; 134:305-12. [PMID: 11564648 PMCID: PMC1572945 DOI: 10.1038/sj.bjp.0704234] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
Abstract
1. The present study was designed to examine the possible role of neuronal nitric oxide synthase (nNOS) in regulation of leukocyte - endothelial cell interactions in the absence of endothelial nitric oxide synthase (eNOS), using intravital microscopy of the cremasteric microcirculation of eNOS(-/-) mice. 2. Baseline leukocyte rolling and adhesion revealed no differences between wild-type and eNOS(-/-) mice in either the cremasteric or intestinal microcirculations. 3. Superfusion with L-NAME (100 microM) caused a progressive and significant increase in leukocyte adhesion in both wild-type and eNOS(-/-) mice, without detecting differences between the two strains of mice. 4. Superfusion with 7-nitroindazole (100 microM), a selective inhibitor of nNOS, had no effect on leukocyte adhesion in wild-type animals. However, it increased leukocyte adhesion significantly in eNOS(-/-) mice, which was reversed by systemic L-arginine pre-administration. 5. Stimulation of the microvasculature with H(2)O(2) (100 microM) induced a transient elevation in leukocyte rolling in wild-type mice. Conversely, the effect persisted during the entire 60 min of experimental protocol in eNOS(-/-) mice either with or without 7-nitroindazole. 6. Semi-quantitative analysis by RT - PCR of the mRNA for nNOS levels in eNOS(-/-) and wild-type animals, showed increased expression of nNOS in both brain and skeletal muscle of eNOS(-/-) mice. 7. In conclusion, we have demonstrated that leukocyte-endothelial cell interactions are predominantly modulated by eNOS isoform in postcapillary venules of normal mice, whereas nNOS appears to assume the same role in eNOS(-/-) mice. Interestingly, unlike eNOS there was insufficient NO produced by nNOS to overcome leukocyte recruitment elicited by oxidative stress, suggesting that nNOS cannot completely compensate for eNOS.
Collapse
Affiliation(s)
- M J Sanz
- Immunology Research Group, University of Calgary, Calgary, Alberta T2N 4N1, Canada.
| | | | | | | | | | | | | |
Collapse
|
19
|
Kuhlencordt PJ, Gyurko R, Han F, Scherrer-Crosbie M, Aretz TH, Hajjar R, Picard MH, Huang PL. Accelerated atherosclerosis, aortic aneurysm formation, and ischemic heart disease in apolipoprotein E/endothelial nitric oxide synthase double-knockout mice. Circulation 2001; 104:448-54. [PMID: 11468208 DOI: 10.1161/hc2901.091399] [Citation(s) in RCA: 430] [Impact Index Per Article: 18.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
BACKGROUND To test whether deficiency in endothelial nitric oxide synthase (eNOS) affects atherosclerosis development, we compared lesion formation in apolipoprotein E (apoE)/eNOS-double knockout (DKO) and apoE-knockout (KO) control animals. METHODS AND RESULTS After 16 weeks of "Western-type" diet, apoE/eNOS-DKO males and females showed significant increases in lesion area of 93.6% and 59.2% compared with apoE-KO mice. All apoE/eNOS-DKO animals studied developed peripheral coronary arteriosclerosis, associated with perivascular and myocardial fibrosis, whereas none of the apoE-KO mice did. Transthoracic echocardiography showed a significantly increased left ventricular wall thickness and decreased fractional shortening in DKO animals. Mean arterial pressure was increased in DKO mice and was comparable in degree to eNOS-KO animals. Male DKO animals developed atherosclerotic abdominal aneurysms and aortic dissection. CONCLUSIONS eNOS deficiency increases atherosclerosis in Western-type diet-fed apoE-KO animals and introduces coronary disease and an array of cardiovascular complications, including spontaneous aortic aneurysm and dissection. This phenotype constitutes the first murine model to demonstrate distal coronary arteriosclerosis associated with evidence of myocardial ischemia, infarction, and heart failure. Hypertrophy and reduced left ventricular function cannot be explained by increased blood pressure alone, because eNOS-KO animals do not develop these complications.
Collapse
Affiliation(s)
- P J Kuhlencordt
- Cardiovascular Research Center, Cardiology Division, Department of Pathology, Massachusetts General Hospital, Boston, Massachusetts, USA
| | | | | | | | | | | | | | | |
Collapse
|
20
|
Feletou M, Lonchampt M, Coge F, Galizzi JP, Bassoullet C, Merial C, Robineau P, Boutin JA, Huang PL, Vanhoutte PM, Canet E. Regulation of murine airway responsiveness by endothelial nitric oxide synthase. Am J Physiol Lung Cell Mol Physiol 2001; 281:L258-67. [PMID: 11404269 DOI: 10.1152/ajplung.2001.281.1.l258] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Nitric oxide (NO) is a potent vasodilator, but it can also modulate contractile responses of the airway smooth muscle. Whether or not endothelial (e) NO synthase (NOS) contributes to the regulation of bronchial tone is unknown at present. Experiments were designed to investigate the isoforms of NOS that are expressed in murine airways and to determine whether or not the endogenous release of NO modulates bronchial tone in wild-type mice and in mice with targeted deletion of eNOS [eNOS(-/-)]. The presence of neuronal NOS (nNOS), inducible NOS (iNOS), and eNOS in murine trachea and lung parenchyma was assessed by RT-PCR, immunoblotting, and immunohistochemistry. Airway resistance was measured in conscious unrestrained mice by means of a whole body plethysmography chamber. The three isoforms of NOS were constitutively present in lungs of wild-type mice, whereas only iNOS and nNOS were present in eNOS(-/-) mice. Labeling of nNOS was localized in submucosal airway nerves but was not consistently detected, and iNOS immunoreactivity was observed in tracheal and bronchiolar epithelial cells, whereas eNOS was expressed in endothelial cells. In wild-type mice, treatment with N-nitro-L-arginine methyl ester, but not with aminoguanidine, potentiated the increase in airway resistance produced by inhalation of methacholine. eNOS(-/-) mice were hyperresponsive to inhaled methacholine and markedly less sensitive to N-nitro-L-arginine methyl ester. These results demonstrate that the three NOS isoforms are expressed constitutively in murine lung and that NO derived from eNOS plays a physiological role in controlling bronchial airway reactivity.
Collapse
Affiliation(s)
- M Feletou
- Institut de Recherches Servier, 92150 Suresnes, France
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
21
|
Kuhlencordt PJ, Chen J, Han F, Astern J, Huang PL. Genetic deficiency of inducible nitric oxide synthase reduces atherosclerosis and lowers plasma lipid peroxides in apolipoprotein E-knockout mice. Circulation 2001; 103:3099-104. [PMID: 11425775 DOI: 10.1161/01.cir.103.25.3099] [Citation(s) in RCA: 171] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
BACKGROUND Inducible nitric oxide synthase (iNOS) is expressed by leukocytes and smooth muscle cells in atherosclerotic lesions. To test whether NO produced by iNOS deficiency affects atherosclerosis, we studied apoE/iNOS-double knockout (dKO) and apoE-knockout (KO) control animals fed a "Western-type" diet. METHODS AND RESULTS After 16 weeks of Western-type diet, the aortic lesion area in apoE/iNOS-dKO males and females was significantly reduced, by 22% and 21%, respectively, compared with apoE-KO males and females. This effect was more pronounced after 24 weeks of Western-type diet, after which lesion formation in male and female dKO mice was reduced by 38% and 40%, respectively. Plasma levels of lipoperoxides in apoE/iNOS-dKO mice (2.0+/-0.23 micromol/L) were significantly lower than in apoE-KO control animals (3.2+/-0.44 micromol/L; P=0.02). To test whether substrate deficiency plays a role in the proatherogenic actions of iNOS, we administered L-arginine to apoE-KO animals for 16 and 24 weeks. L-Arginine treatment did not affect lesion formation in apoE-KO animals fed a Western-type diet. CONCLUSIONS Genetic deficiency of iNOS decreases diet-induced atherosclerosis and lowers plasma levels of lipoperoxides, a marker for oxidative stress, in apoE-KO animals. Reduction in iNOS-mediated oxidative stress could partly explain protection from lesion formation in dKO animals. L-Arginine supplementation did not change lesion area in apoE-KO mice, indicating that substrate deficiency is not a likely cause for iNOS-mediated injury in this model of atherosclerosis.
Collapse
Affiliation(s)
- P J Kuhlencordt
- Cardiovascular Research Center and Cardiology Division, Massachusetts General Hospital, and Harvard Medical School, Boston, Massachusetts, USA
| | | | | | | | | |
Collapse
|
22
|
Scalia R, Gooszen ME, Jones SP, Hoffmeyer M, Rimmer DM, Trocha SD, Huang PL, Smith MB, Lefer AM, Lefer DJ. Simvastatin exerts both anti-inflammatory and cardioprotective effects in apolipoprotein E-deficient mice. Circulation 2001; 103:2598-603. [PMID: 11382730 DOI: 10.1161/01.cir.103.21.2598] [Citation(s) in RCA: 144] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
BACKGROUND Simvastatin attenuates ischemia and reperfusion in normocholesterolemic animals by stabilizing endothelial nitric oxide synthase activity and inhibiting neutrophil-mediated injury. Because endothelial dysfunction is a detrimental effect of hypercholesterolemia, we examined whether short-term treatment with simvastatin could inhibit leukocyte-endothelium interaction and attenuate myocardial ischemia-reperfusion injury in apoE-deficient (apoE(-/-)) mice fed a high-cholesterol diet. METHODS AND RESULTS We studied leukocyte-endothelium interactions in apoE(-/-) mice fed a normal or a high-cholesterol diet after short-term (ie, 18 hours) simvastatin treatment. We also studied simvastatin treatment in myocardial ischemia-reperfusion injury by subjecting apoE(-/-) mice to 30 minutes of ischemia and 24 hours of reperfusion. ApoE(-/-) mice fed a high-cholesterol diet exhibited higher blood cholesterol levels, which were not affected by short-term simvastatin treatment. However, the increased leukocyte rolling and adherence that occurred in cholesterol-fed apoE(-/-) mice (P<0.001 versus control diet) were significantly attenuated by simvastatin treatment (P<0.01 versus vehicle). Cholesterol-fed apoE(-/-) mice subjected to myocardial ischemia-reperfusion also experienced increased myocardial necrosis (P<0.01 versus control diet), which was significantly attenuated by simvastatin (P<0.01 versus vehicle). Simvastatin therapy also significantly increased vascular nitric oxide production in apoE(-/-) mice. CONCLUSIONS Simvastatin attenuates leukocyte-endothelial cell interactions and ameliorates ischemic injury in hypercholesterolemic mice independently of lipid-lowering actions.
Collapse
Affiliation(s)
- R Scalia
- Department of Physiology, Jefferson Medical College, Thomas Jefferson University, Philadelphia, PA, USA
| | | | | | | | | | | | | | | | | | | |
Collapse
|
23
|
Amin-Hanjani S, Stagliano NE, Yamada M, Huang PL, Liao JK, Moskowitz MA. Mevastatin, an HMG-CoA reductase inhibitor, reduces stroke damage and upregulates endothelial nitric oxide synthase in mice. Stroke 2001; 32:980-6. [PMID: 11283400 DOI: 10.1161/01.str.32.4.980] [Citation(s) in RCA: 228] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
BACKGROUND AND PURPOSE The 3-hydroxy-3-methylglutaryl coenzyme A (HMG-CoA) reductase inhibitors (statins) lower serum cholesterol and decrease the incidence of stroke and cardiovascular disease. There is growing evidence that statins exert some of their beneficial effects independent of cholesterol lowering. Indeed, we have previously demonstrated that chronic simvastatin administration upregulates endothelial nitric oxide synthase (eNOS), resulting in more functional protein, augmentation of cerebral blood flow, and neuroprotection in a murine model of cerebral ischemia. In this report we examined whether another member of the statin family shared these effects and whether eNOS upregulation is sustained with longer treatment. METHODS Mevastatin (2 mg/kg or 20 mg/kg per day) was administered to 18- to 22-g male mice for 7, 14, or 28 days before 2-hour middle cerebral artery occlusion with the use of the filament model (n=9 to 12). Neurological deficits and cerebral infarct volumes were assessed at 24 hours. Arterial blood pressure and gases, relative cerebral blood flow, and blood cholesterol levels were monitored in a subset of animals (n=5). Absolute cerebral blood flow was measured by the [(14)C]iodoamphetamine indicator fractionation technique (n=6). eNOS mRNA and protein levels were determined. RESULTS Mevastatin increased levels of eNOS mRNA and protein, reduced infarct size, and improved neurological deficits in a dose- and time-dependent manner. Greatest protection was seen with 14- and 28-day high-dose treatment (26% and 37% infarct reduction, respectively). Cholesterol levels were reduced only after 28 days of treatment and did not correlate with infarct reduction. Baseline absolute cerebral blood flow was 30% higher after 14-day high-dose treatment. CONCLUSIONS Chronic prophylactic treatment with mevastatin upregulated eNOS and augmented cerebral blood flow. These changes occurred in the absence of changes in serum cholesterol levels, were sustained for up to 1 month of treatment, and resulted in neuroprotection after middle cerebral artery occlusion.
Collapse
Affiliation(s)
- S Amin-Hanjani
- Stroke and Neurovascular Regulation Laboratory, Massachusetts General Hospital, Harvard Medical School, Charlestown, Massachusetts, USA
| | | | | | | | | | | |
Collapse
|
24
|
Comtois AS, Barreiro E, Huang PL, Marette A, Perrault M, Hussain SN. Lipopolysaccharide-induced diaphragmatic contractile dysfunction and sarcolemmal injury in mice lacking the neuronal nitric oxide synthase. Am J Respir Crit Care Med 2001; 163:977-82. [PMID: 11282776 DOI: 10.1164/ajrccm.163.4.9912057] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
In this study we evaluated the role of the neuronal nitric oxide synthase (nNOS) in lipopolysaccharide (LPS)-induced diaphragmatic contractile dysfunction and sarcolemmal injury. Wild-type (WT) mice or mice deficient in the nNOS gene (nNOS(-/-)) were injected with either saline (control) or Escherichia coli LPS (LPS groups) and sacrificed 12 h later. The diaphragm was then examined for NOS expression, NOS activity, and in-vitro contractility. We also assessed sarcolemmal injury in isolated muscle strips under resting condition and after 3 min of artificial stimulations. In WT mice, LPS injection reduced maximum force to about 75% of that of control animals and raised total NOS activity significantly due to the induction of the iNOS isoform. Although muscle fiber injury was minimal under resting condition, the percentage of injured fibers in control and LPS-injected mice approached 27% and 40% of total fibers, respectively, in response to artificial stimulation. By comparison, LPS injection in nNOS(-/-) mice elicited a worsening of muscle contractility (maximum force < 60% of control animals) but elicited degrees of sarcolemmal injury similar to those observed in the WT animals. In addition, muscle NOS activity and iNOS protein level in nNOS(-/-) mice injected with LPS reached about 10% and 60% of that of WT animals, respectively (p < 0.05 compared with WT animals). Protein level of endothelial NOS isoform in the diaphragm was not altered by LPS injection in either WT or nNOS(-/-) animals. We conclude that nNOS plays a protective role in attenuating the negative influence of sepsis on diaphragmatic contractility but is not involved in the pathogenesis of sepsis-induced sarcolemmal injury.
Collapse
Affiliation(s)
- A S Comtois
- Critical Care and Respiratory Divisions, Royal Victoria Hospital and Meakins-Christie Laboratories, McGill University, Montréal, Québec, Canada
| | | | | | | | | | | |
Collapse
|
25
|
Fukumura D, Gohongi T, Kadambi A, Izumi Y, Ang J, Yun CO, Buerk DG, Huang PL, Jain RK. Predominant role of endothelial nitric oxide synthase in vascular endothelial growth factor-induced angiogenesis and vascular permeability. Proc Natl Acad Sci U S A 2001; 98:2604-9. [PMID: 11226286 PMCID: PMC30185 DOI: 10.1073/pnas.041359198] [Citation(s) in RCA: 731] [Impact Index Per Article: 31.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Nitric oxide (NO) plays a critical role in vascular endothelial growth factor (VEGF)-induced angiogenesis and vascular hyperpermeability. However, the relative contribution of different NO synthase (NOS) isoforms to these processes is not known. Here, we evaluated the relative contributions of endothelial and inducible NOS (eNOS and iNOS, respectively) to angiogenesis and permeability of VEGF-induced angiogenic vessels. The contribution of eNOS was assessed by using an eNOS-deficient mouse, and iNOS contribution was assessed by using a selective inhibitor [l-N(6)-(1-iminoethyl) lysine, l-NIL] and an iNOS-deficient mouse. Angiogenesis was induced by VEGF in type I collagen gels placed in the mouse cranial window. Angiogenesis, vessel diameter, blood flow rate, and vascular permeability were proportional to NO levels measured with microelectrodes: Wild-type (WT) > or = WT with l-NIL or iNOS(-/-) > eNOS(-/-) > or = eNOS(-/-) with l-NIL. The role of NOS in VEGF-induced acute vascular permeability increase in quiescent vessels also was determined by using eNOS- and iNOS-deficient mice. VEGF superfusion significantly increased permeability in both WT and iNOS(-/-) mice but not in eNOS(-/-) mice. These findings suggest that eNOS plays a predominant role in VEGF-induced angiogenesis and vascular permeability. Thus, selective modulation of eNOS activity is a promising strategy for altering angiogenesis and vascular permeability in vivo.
Collapse
Affiliation(s)
- D Fukumura
- Edwin L. Steele Laboratory, Department of Radiation Oncology, Massachusetts General Hospital and Harvard Medical School, 100 Blossom Street, Boston, MA 02114, USA.
| | | | | | | | | | | | | | | | | |
Collapse
|
26
|
Grange RW, Isotani E, Lau KS, Kamm KE, Huang PL, Stull JT. Nitric oxide contributes to vascular smooth muscle relaxation in contracting fast-twitch muscles. Physiol Genomics 2001; 5:35-44. [PMID: 11161004 DOI: 10.1152/physiolgenomics.2001.5.1.35] [Citation(s) in RCA: 68] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
During skeletal muscle contraction, NO derived from neuronal nitric oxide synthase (nNOS) in skeletal muscle fibers or from endothelial cells (eNOS) may relax vascular smooth muscle contributing to functional hyperemia. To examine the relative importance of these pathways, smooth muscle myosin regulatory light chain (smRLC) phosphorylation was assessed as an index of vascular tone in isolated extensor digitorum longus (EDL) muscles from C57, nNOS(-/-), and eNOS(-/-) mice. The smRLC phosphorylation (in mol phosphate per mol smRLC) in C57 resting muscles (0.12 +/- 0.04) was increased 3.7-fold (0.44 +/- 0.03) by phenylephrine (PE). Reversal of this increase with electrical stimulation (to 0.19 +/- 0.03; P < 0.05) was partially blocked by N(omega)-nitro-l-arginine (NLA). In nNOS(-/-) EDL, the PE-induced increase in smRLC phosphorylation (0.10 +/- 0.02 to 0.49 +/- 0.04) was partially decreased by stimulation (0.25 +/- 0.04). In eNOS(-/-) EDL, the control value for smRLC was increased (0.24 +/- 0.04), and PE-induced smRLC phosphorylation (0.36 +/- 0.06) was decreased by stimulation even in the presence of NLA (to 0.20 +/- 0.02; P < 0.05). These results suggest that in addition to NO-independent mechanisms, NO derived from both nNOS and eNOS plays a role in the integrative vascular response of contracting skeletal muscle.
Collapse
Affiliation(s)
- R W Grange
- Department of Physiology, University of Texas Southwestern Medical Center at Dallas, Dallas, Texas 75235-9040, USA.
| | | | | | | | | | | |
Collapse
|
27
|
Brooks SE, Gu X, Samuel S, Marcus DM, Bartoli M, Huang PL, Caldwell RB. Reduced severity of oxygen-induced retinopathy in eNOS-deficient mice. Invest Ophthalmol Vis Sci 2001; 42:222-8. [PMID: 11133872] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/18/2023] Open
Abstract
PURPOSE Exposure of premature human infants to hyperoxia results in the obliteration of developing retina capillaries, leading to a vision-threatening retinopathy termed retinopathy of prematurity (ROP). The authors hypothesized that this process may be mediated in part by endothelial nitric oxide (NO)-derived oxidants such as peroxynitrite and tested this hypothesis in a mouse model of ROP. METHODS Normal mice, mice treated with the nitric oxide synthase (NOS) inhibitor N:(G)-nitro-L-arginine (L-NNA), and knockout mice carrying a homozygous targeted disruption of the gene for endothelial NOS (eNOS) were studied in an experimental model of ROP. Retinas were compared for extent of capillary obliteration in hyperoxia, vascular endothelial growth factor (VEGF) expression, nitrotyrosine formation, and vitreous neovascularization. RESULTS Oxygen-induced retinal vaso-obliteration was significantly reduced by L-NNA treatment (43% decrease from controls). The eNOS-deficient mice showed a similar reduction in vaso-obliteration (46% decrease from controls), and vitreous neovascularization was also substantially reduced (threefold decrease). Retinal nitrotyrosine formation, a measure of in situ peroxynitrite modification of proteins, was significantly elevated in normal mice during hyperoxia, in a spatial and temporal pattern consistent with a role in oxygen-induced vaso-obliteration. This was not seen in eNOS-deficient mice. VEGF expression was similar in both groups of mice, although suppression in hyperoxia was slightly blunted in eNOS-deficient mice. CONCLUSIONS These data suggest a role for NO and peroxynitrite in the pathogenesis of ROP. Therapies aimed at modulation of eNOS activity may have therapeutic potential for preventing ROP.
Collapse
Affiliation(s)
- S E Brooks
- Departments of Ophthalmology, Pediatrics, Cellular Biology and Anatomy, Medical College of Georgia, Augusta, GA 30912, USA.
| | | | | | | | | | | | | |
Collapse
|
28
|
Lee TC, Buerkle H, Wang CJ, Liang CL, Lu K, Huang PL, Cheng CH, Yang LC. Effect of isoflurane versus nicardipine on blood flow of lumbar paraspinal muscles during controlled hypotension for spinal surgery. Spine (Phila Pa 1976) 2001; 26:105-9; discussion 109. [PMID: 11148653 DOI: 10.1097/00007632-200101010-00018] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
STUDY DESIGN This study compared the effects of isoflurane and nicardipine on regional blood flow of the lumbar paraspinal muscles. OBJECTIVES The purpose of this study was to determine whether treatment with hypotensive agents result in ischemia of the lumbar paraspinal muscles, thereby facilitating surgical procedures. SUMMARY OF BACKGROUND DATA Despite the general acceptance of controlled hypotension as effective in reducing blood loss during spinal surgery, the changes of blood flow that occur at the lumbar paraspinal muscles when this technique is applied remain unclear. The use of laser Doppler flowmetry allows changes of muscle blood flow to be easily detected in real time with minimal invasion, thereby allowing differences among distinct pharmacological approaches for induction and maintenance of controlled hypotension to be evaluated. METHODS The prehypotensive and hypotensive (reduction of mean arterial pressure by 20 mm Hg) blood flow of the lumbar paraspinal muscles were assessed with a laser Doppler flowmeter in 40 patients undergoing lumbar spinal surgery. The first half of the patients (n = 20) received isoflurane, whereas the second half received nicardipine to achieve arterial hypotension. RESULTS Compared with the prehypotensive state, during the hypotensive state, patients in the isoflurane group exhibited a 17% to 46% (mean, 33.7%) decrease in lumbar paraspinal muscle blood flow, whereas patients in the nicardipine group exhibited a 24% to 177% (mean, 82.5%) increase in lumbar paraspinal muscle blood flow. Statistical analysis showed a significant difference in the changes of flux after induced hypotension between the isoflurane and nicardipine group (P < 0.001). CONCLUSIONS Depending on the pharmacological treatment used to achieve arterial hypotension in spine surgery, there will be either a reduction in paraspinal muscle blood flow (ischemia) or an enhancement of this blood flow (hyperemia).
Collapse
Affiliation(s)
- T C Lee
- Department of Neurosurgery, Kaohsiung Chang Gung Memorial Hospital, Kaohsiung, Taiwan
| | | | | | | | | | | | | | | |
Collapse
|
29
|
Putzke J, Seidel B, Huang PL, Wolf G. Differential expression of alternatively spliced isoforms of neuronal nitric oxide synthase (nNOS) and N-methyl-D-aspartate receptors (NMDAR) in knockout mice deficient in nNOS alpha (nNOS alpha(Delta/Delta) mice). Brain Res Mol Brain Res 2000; 85:13-23. [PMID: 11146102 DOI: 10.1016/s0169-328x(00)00220-5] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
Recent data suggest that the neuronal isoform of nitric oxide synthase (nNOS) and glutamate receptors of the N-methyl-D-aspartate (NMDA) type are physically coupled and, hence, functionally interrelated. Several alternatively spliced isoforms of the N-methyl-D-aspartate receptor 1 (NMDAR1) subunit and the neuronal nitric oxide synthase (nNOS) are known, and recent studies have shown that a spliced C-terminal may be responsible for the coupling of NMDAR's to nNOS via its PDZ domain and the postsynaptic density protein PSD95. However, little is known about whether and to what extent changes in nNOS expression influence NMDA receptor density or function. We have therefore compared the localization of nNOS alpha, beta and gamma with that of two relevant NMDAR1 splice variants in wild-type mice versus knockout mice deficient in nNOS alpha, generated by homologous recombination with a targeted deletion of exon 2, containing one PDZ domain (nNOS alpha(Delta/Delta) mice). Whereas nNOS alpha was completely absent in nNOS alpha(Delta/Delta) mice, nNOS beta and gamma were expressed in both wild-type and knockout animals. nNOS gamma mRNA, though, was hardly detectable, if at all, mainly within the olfactory bulb, the cerebellum and mesencephalic nuclei of knockout animals. The expression of the NMDAR1-1 splice variant (without any short carboxy-terminal amino acid motif, recognized by PDZ domains) was remarkably decreased in striatal, cortical, hippocampal and cerebellar tissue in nNOS alpha(Delta/Delta) animals, but no changes in NMDAR1-4 (with an alternatively spliced C-terminal and thus with a PDZ binding motif) mRNA and protein levels were observed. While NMDAR1-4 may be related to receptor targeting and clustering to PSD95 and to nNOS, our data suggest that differences in nNOS expression obviously do not directly influence gene expression of this particular NMDAR splice variant. Otherwise, the observed diminution of NMDAR1-1 splice variant mRNA and protein levels may, at least partially, explain the decreased vulnerability of nNOS alpha(Delta/Delta) mice to glutamate-mediated neurotoxicity.
Collapse
Affiliation(s)
- J Putzke
- Institute of Medical Neurobiology, University of Magdeburg, Leipziger Strasse 44, Magdeburg D-39120, Germany.
| | | | | | | |
Collapse
|
30
|
Abstract
BACKGROUND A substantial amount of data suggesting that endothelial cell nitric oxide synthase (eNOS) plays a cardioprotective role in animal models of ischemia-reperfusion injury has amassed. We have previously demonstrated that eNOS-deficient (-/-) mice exhibit significantly larger myocardial infarcts than do wild-type mice. Few investigations have examined the neuronal form of nitric oxide synthase in the heart. The two constitutive isoforms have been demonstrated to play differing roles in studies of cerebral ischemia-reperfusion. OBJECTIVE To characterize the role of neuronal nitric oxide synthase (nNOS) in myocardial ischemia-reperfusion injury. METHODS Wild-type and nNOS -/- mice were subjected to 20 min of coronary artery occlusion and 120 min of reflow. RESULTS We found no significant difference between the two groups in terms of infarct size. Microscopic cross-sections from both groups were examined for infiltration of polymorphonuclear leukocyte. Hearts of nNOS -/- mice exhibited significantly (P < 0.05) more polymorphonuclear leukocytes than did hearts of wild-type mice. CONCLUSION Despite the fact that eNOS plays a cardioprotective role in the ischemic-reperfused myocardium, we observed no change in size of myocardial infarcts when nNOS was genetically disrupted.
Collapse
Affiliation(s)
- S P Jones
- Department of Molecular and Cellular Physiology, Louisiana State University Health Sciences Center, Shreveport 71130, USA
| | | | | | | |
Collapse
|
31
|
Huang PL. Mouse models of nitric oxide synthase deficiency. J Am Soc Nephrol 2000; 11 Suppl 16:S120-3. [PMID: 11065342] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/18/2023] Open
Abstract
Knockout mice for each of the three nitric oxide (NO) synthase (NOS) genes have been generated. Their phenotypes reflect the roles of each NOS isoform in physiologic and pathologic processes. This article reviews how neuronal NOS (nNOS) and endothelial NOS (eNOS) knockout mice have contributed to our knowledge of the roles of NO in cerebral ischemia, cardiovascular processes, and the autonomic nervous system. In some instances, the effects of NO produced by one isoform antagonize the effects of NO produced by another isoform. For example, after cerebral ischemia, the nNOS isoform is involved in tissue injury, whereas the eNOS isoform is important in maintaining blood flow. All three isoforms are expressed in the respiratory tract, but only the nNOS isoform appears to be involved in modulating airway responsiveness and only the inducible NOS isoform appears to respond to antigen stimulation. In the cardiovascular system, endothelial NO is important for vascular tone, systolic and diastolic cardiac function, vascular proliferative responses to injury, platelet aggregation, and hemostasis.
Collapse
Affiliation(s)
- P L Huang
- Cardiovascular Research Center and Cardiology Division, Massachusetts General Hospital, Harvard Medical School, Charlestown, Massachusetts 02129-2060, USA
| |
Collapse
|
32
|
Brandes RP, Schmitz-Winnenthal FH, Félétou M, Gödecke A, Huang PL, Vanhoutte PM, Fleming I, Busse R. An endothelium-derived hyperpolarizing factor distinct from NO and prostacyclin is a major endothelium-dependent vasodilator in resistance vessels of wild-type and endothelial NO synthase knockout mice. Proc Natl Acad Sci U S A 2000; 97:9747-52. [PMID: 10944233 PMCID: PMC16936 DOI: 10.1073/pnas.97.17.9747] [Citation(s) in RCA: 217] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
In addition to nitric oxide (NO) and prostacyclin (PGI(2)), the endothelium generates the endothelium-derived hyperpolarizing factor (EDHF). We set out to determine whether an EDHF-like response can be detected in wild-type (WT) and endothelial NO synthase knockout mice (eNOS -/-) mice. Vasodilator responses to endothelium-dependent agonists were determined in vivo and in vitro. In vivo, bradykinin induced a pronounced, dose-dependent decrease in mean arterial pressure (MAP) which did not differ between WT and eNOS -/- mice and was unaffected by treatment with N(omega)-nitro-l-arginine methyl ester and diclofenac. In the saline-perfused hindlimb of WT and eNOS -/- mice, marked N(omega)-nitro-l-arginine (l-NA, 300 micromol/liter)- and diclofenac-insensitive vasodilations in response to both bradykinin and acetylcholine (ACh) were observed, which were more pronounced than the agonist-induced vasodilation in the hindlimb of WT in the absence of l-NA. This endothelium-dependent, NO/PGI(2)-independent vasodilatation was sensitive to KCl (40 mM) and to the combination of apamin and charybdotoxin. Gap junction inhibitors (18alpha-glycyrrhetinic acid, octanol, heptanol) and CB-1 cannabinoid-receptor agonists (Delta(9)-tetrahydrocannabinol, HU210) impaired EDHF-mediated vasodilation, whereas inhibition of cytochrome P450 enzymes, soluble guanylyl cyclase, or adenosine receptors had no effect on EDHF-mediated responses. These results demonstrate that in murine resistance vessels the predominant agonist-induced endothelium-dependent vasodilation in vivo and in vitro is not mediated by NO, PGI(2), or a cytochrome P450 metabolite, but by an EDHF-like principle that requires functional gap junctions.
Collapse
Affiliation(s)
- R P Brandes
- Institut für Kardiovaskuläre Physiologie, Klinikum der J.W. Goethe-Universität, Frankfurt am Main, Germany.
| | | | | | | | | | | | | | | |
Collapse
|
33
|
Abstract
Lactating female rodents protect their pups by expressing fierce aggression, termed maternal aggression, toward intruders. Mice lacking the neuronal nitric oxide synthase gene (nNOS-/-) exhibit significantly impaired maternal aggression, but increased male aggression, suggesting that nitric oxide (NO) produced by nNOS has opposite actions in maternal and male aggression. In contrast, mice lacking the endothelial nitric oxide synthase gene (eNOS-/-) exhibit almost no male aggression, suggesting that NO produced by eNOS facilitates male aggression. In the present study, maternal aggression in eNOS-/- mice was examined and found to be normal relative to wild-type (WT) mice in terms of the percentage displaying aggression, the average number of attacks against a male intruder, and the total amount of time spent attacking the male intruder. The eNOS-/- females also displayed normal pup retrieval behavior. Because a significant elevation of citrulline, an indirect marker of NO synthesis, occurs in neurons of the hypothalamus of lactating WT mice in association with maternal aggression, we examined the brains of eNOS-/- females for citrulline immunoreactivity following an aggressive encounter. The aggressive eNOS-/- females exhibited a significant elevation of citrulline in the medial preoptic nucleus and the subparaventricular zone of the hypothalamus relative to unstimulated lactating eNOS-/- females. Taken together, these results suggest that NO produced by eNOS neither facilitates nor inhibits maternal aggression and that NO produced by eNOS has a different role in maternal and male aggression.
Collapse
Affiliation(s)
- S C Gammie
- Department of Psychology, The Johns Hopkins University, Baltimore, Maryland 21218, USA.
| | | | | |
Collapse
|
34
|
Laufs U, Endres M, Stagliano N, Amin-Hanjani S, Chui DS, Yang SX, Simoncini T, Yamada M, Rabkin E, Allen PG, Huang PL, Böhm M, Schoen FJ, Moskowitz MA, Liao JK. Neuroprotection mediated by changes in the endothelial actin cytoskeleton. J Clin Invest 2000; 106:15-24. [PMID: 10880044 PMCID: PMC314365 DOI: 10.1172/jci9639] [Citation(s) in RCA: 224] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023] Open
Abstract
Cerebral blood flow is regulated by endothelium-derived nitric oxide (NO), and endothelial NO synthase-deficient (eNOS-deficient; eNOS(-/-)) mice develop larger cerebral infarctions following middle cerebral artery (MCA) occlusion. We report that disruption of Rho-mediated endothelial actin cytoskeleton leads to the upregulation of eNOS expression and reduces the severity of cerebral ischemia following MCA occlusion. Mice treated with the Rho inhibitor Clostridium botulinum C3 transferase (10 microgram/d) or the actin cytoskeleton disrupter cytochalasin D (1 mg/kg) showed a two- to fourfold increase in vascular eNOS expression and activity. This increase in eNOS expression was not due to increases in eNOS gene transcription, but to prolongation of eNOS mRNA half-life from 10 +/- 3 hours to 24 +/- 4 hours. Indeed, endothelial cells overexpressing a dominant-negative Rho mutant (N19RhoA) exhibited decreased actin stress fiber formation and increased eNOS expression. Inhibition of vascular Rho guanosine-5'-triphosphate binding activity by the 3-hydroxy-3-methylglutaryl-coenzyme A reductase inhibitor simvastatin increased cerebral blood flow to ischemic regions of the brain, and mice treated with simvastatin, C3 transferase, or cytochalasin D showed smaller cerebral infarctions following MCA occlusion. No neuroprotection was observed with these agents in eNOS(-/-) mice. These findings suggest that therapies which target the endothelial actin cytoskeleton may have beneficial effects in ischemic stroke.
Collapse
Affiliation(s)
- U Laufs
- Cardiovascular Division, Department of Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston, Massachusetts, USA
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
35
|
Cheng HZ, Huang PL, Huang SL, Kao FJ. Reentrant two-mirror ring resonator for generation of a single-frequency green laser. Opt Lett 2000; 25:542-544. [PMID: 18064105 DOI: 10.1364/ol.25.000542] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
A nonplanar, reentrant two-spherical-mirror ring cavity is demonstrated. It is compact and free of astigmatism. Unidirectional operation is achieved by use of reciprocal and nonreciprocal polarization rotators to differentiate round-trip loss. A single-frequency green laser is generated by intracavity frequency doubling. Amplitude noise as low as 0.25% is achieved.
Collapse
|
36
|
Yamada M, Huang Z, Dalkara T, Endres M, Laufs U, Waeber C, Huang PL, Liao JK, Moskowitz MA. Endothelial nitric oxide synthase-dependent cerebral blood flow augmentation by L-arginine after chronic statin treatment. J Cereb Blood Flow Metab 2000; 20:709-17. [PMID: 10779015 DOI: 10.1097/00004647-200004000-00008] [Citation(s) in RCA: 114] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Nitric oxide, a product of nitric oxide synthase activity, relaxes vascular smooth muscle and elevates brain blood flow. We evaluated the importance of eNOS to cerebral blood flow augmentation after L-arginine infusion and increases in flow after eNOS upregulation in SV-129 mice. Blood flow was measured by laser-Doppler flowmetry before and after L-arginine infusion (450 mg/kg during a 15-minute period) or measured by 14C-iodoamphetamine indicator fractionation or 14C-iodoantipyrine tissue equilibration techniques. rCBF increased by 26% (laser Doppler flowmetry) after L-arginine infusion but did not change in mutant mice deficient in eNOS expression. After eNOS upregulation by chronic simvastatin treatment (2 mg/kg subcutaneously, daily for 14 days), L-arginine amplified and sustained the hyperemia (38%) and increased absolute brain blood flow from 86 +/- 7 to 119 +/- 10 mL/100 g per minute. Furthermore, pretreatment with simvastatin enhanced blood flow within ischemic brain tissue after middle cerebral artery occlusion. Together, these findings suggest that eNOS activity is critical for blood flow augmentation during acute L-arginine infusion, and chronic eNOS upregulation combined with L-arginine administration provides a novel strategy to elevate cerebral blood flow in the normal and ischemic brain.
Collapse
Affiliation(s)
- M Yamada
- Stroke and Neurovascular Regulation, Massachusetts General Hospital, Harvard Medical School, Charlestown, USA
| | | | | | | | | | | | | | | | | |
Collapse
|
37
|
Wu HH, Cork RJ, Huang PL, Shuman DL, Mize RR. Refinement of the ipsilateral retinocollicular projection is disrupted in double endothelial and neuronal nitric oxide synthase gene knockout mice. Brain Res Dev Brain Res 2000; 120:105-11. [PMID: 10727738 DOI: 10.1016/s0165-3806(99)00145-5] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
Development of retinal connections to the superior colliculus (SC) requires an activity dependent refinement process in which axons gradually become restricted to appropriate retinotopic locations. Nitric oxide has been implicated in this process. We tested this possibility by studying the refinement of the ipsilateral retinocollicular projections (IRP) in normal C57-BL/6 mice and in double knockout mice in which the genes for the edothelial and neuronal isoforms of nitric oxide synthase (e, nNOS) were disrupted. Mice aged between P19 and adulthood were perfused 44-48 h after anterograde injections of WGA-HRP into one eye in order to measure the distribution of the labeled IRP. In normal mice, segregation of the IRP was complete at P21, with the ipsilateral projection restricted to the rostro-medial SC. By contrast, the ipsilateral projection was spread over much more of the SC in double e, nNOS knockouts at P21 with patches of label distributed across the entire medio-lateral axis of the rostral 700 microm. Although the distribution of the ipsilateral projection became more restricted in knockout animals at later ages, it was still more extensive than that of normal mice of the same age at P28 and P42. In the adult, the distribution of axons was similar in both normal and double knockout animals. These results show that refinement of the IRP is delayed when expression of eNOS and nNOS is disrupted, presumably to axons with uncorrelated activity because nitric oxide serves as a repellant molecule during normal development.
Collapse
Affiliation(s)
- H H Wu
- Department of Cell Biology and Anatomy and The Neuroscience Center, Louisiana State University Health Sciences Center, 1901 Perdido Street, New Orleans, LA, USA
| | | | | | | | | |
Collapse
|
38
|
Calingasan NY, Huang PL, Chun HS, Fabian A, Gibson GE. Vascular factors are critical in selective neuronal loss in an animal model of impaired oxidative metabolism. J Neuropathol Exp Neurol 2000; 59:207-17. [PMID: 10744059 DOI: 10.1093/jnen/59.3.207] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Thiamine deficiency (TD) models the cellular and molecular mechanisms by which chronic oxidative deficits lead to death of select neurons in brain. Region- and cell-specific oxidative stress and vascular changes accompany the TD-induced neurodegeneration. The current studies analyzed the role of oxidative stress in initiating these events by testing the role of intercellular adhesion molecule-1 (ICAM-1) and endothelial nitric oxide synthase (eNOS) in the selective neuronal loss that begins in the submedial thalamic nucleus of mice. Oxidative stress to microvessels is known to induce eNOS and ICAM-1. TD increased ICAM-1 immunoreactivity in microvessels within the submedial nucleus and adjacent regions 1 day prior to the onset of neuronal loss. On subsequent days, the pattern of ICAM-1 induction overlapped that of neuronal loss, and of induction of the oxidative stress marker heme oxygenase-1 (HO-1). The intensity and extent of ICAM-1 and HO-1 induction progressively spread in parallel with the neuronal death in the thalamus. Targeted disruption of ICAM-1 or eNOS gene, but not the neuronal NOS gene, attenuated the TD-induced neurodegeneration and HO-1 induction. TD induced ICAM-1 in eNOS knockout mice, but did not induce eNOS in mice lacking ICAM-1. These results demonstrate that in TD, an ICAM-1-dependent pathway of eNOS induction leads to oxidative stress-mediated death of metabolically compromised neurons. Thus, TD provides a useful model to help elucidate the role of ICAM-1 and eNOS in the selective neuronal death in diseases in which oxidative stress is implicated.
Collapse
Affiliation(s)
- N Y Calingasan
- Weill Medical College of Cornell University at Burke Medical Research Institute, White Plains, New York 10605, USA
| | | | | | | | | |
Collapse
|
39
|
Lee-Huang S, Huang PL, Sun Y, Chen HC, Kung HF, Huang PL, Murphy WJ. Inhibition of MDA-MB-231 human breast tumor xenografts and HER2 expression by anti-tumor agents GAP31 and MAP30. Anticancer Res 2000; 20:653-9. [PMID: 10810336] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/16/2023]
Abstract
GAP31 (Gelonium protein of 31 kDa) and MAP30 (Momordica protein of 30 kDa) are agents isolated from the medicinal plants Gelonium multiflorum and Momordica charantia, respectively. The current study was conducted to investigate the efficacy of GAP31 and MAP30 on estrogen-independent and highly metastatic human breast tumor MDA-MB-231 both in vitro and in vivo. The effect of these agents on the expression of breast tumor antigen HER2 (also known as neu or as c-erbB 2) was also examined. Treatment of MDA-MB-231 breast cancer cells with GAP31 and MAP30 resulted in inhibition of cancer cell proliferation as well as inhibition of the expression of HER2 gene in vitro. When MDA-MB-231 human breast cancer cells were transferred into SCID mice, the mice developed extensive metastases and all mice succumbed to tumor by day 46. Treatment of the human breast cancer bearing SCID mice with GAP31 or MAP30 at 10 micrograms/injection EOD for 10 injections resulted in significant increases in survival, with 20-25% of the mice remaining tumor free for 96 days. Thus, anti-tumor agents GAP31 and MAP30 are effective against human breast cancer MDA-MB-231 in vitro and in vivo. These agents may therefore be a potential therapeutic use against breast carcinomas.
Collapse
Affiliation(s)
- S Lee-Huang
- Department of Biochemistry, New York University School of Medicine, NY 10016, USA
| | | | | | | | | | | | | |
Collapse
|
40
|
Abstract
To study the role of endothelial nitric oxide synthase (eNOS) in cardiac function, we compared eNOS expression, contractility, and relaxation in the left ventricles of wild-type and eNOS-deficient mice. eNOS immunostaining is localized to the macro- and microvascular endothelium throughout the myocardium in wild-type mice and is absent in eNOS-/- mice. Whereas blood pressure is elevated in eNOS-/- mice, baseline cardiac contractility (dP/dt(max)) is similar in wild-type and eNOS-/- mice (9,673 +/- 2, 447 and 9,928 +/- 1,566 mmHg/s, respectively). The beta-adrenergic agonist isoproterenol (Iso) at doses of >/=1 ng causes enhanced increases in dP/dt(max) in eNOS-/- mice compared with wild-type controls in vivo (P < 0.01) as well as in Langendorff isolated heart preparations (P < 0.02). beta-Adrenergic receptor binding (B(max)) is not significantly different in the two groups of animals (B(max) = 41.4 +/- 9.4 and 36.1 +/- 5.1 fmol/mg for wild-type and eNOS-/-). Iso-stimulated ventricular relaxation is also enhanced in the eNOS-/- mice, as measured by dP/dt(min) in the isolated heart. However, baseline ventricular relaxation is normal in eNOS-/- mice (tau = 5.2 +/- 1.0 and 5.6 +/- 1.5 ms for wild-type and eNOS-/-, respectively), whereas it is impaired in wild-type mice after NOS inhibition (tau = 8.3 +/- 2.4 ms). cGMP levels in the left ventricle are unaffected by eNOS gene deletion (wild-type: 3.1 +/- 0.8 pmol/mg, eNOS-/-: 3.1 +/- 0.6 pmol/mg), leading us to examine the level of another physiological regulator of cGMP. Atrial natriuretic peptide (ANP) expression is markedly upregulated in the eNOS-/- mice, and exogenous ANP restores ventricular relaxation in wild-type mice treated with NOS inhibitors. These results suggest that eNOS attenuates both inotropic and lusitropic responses to beta-adrenergic stimulation, and it also appears to regulate baseline ventricular relaxation in conjunction with ANP.
Collapse
Affiliation(s)
- R Gyurko
- Cardiovascular Research Center and Cardiology Division, Department of Medicine, Massachusetts General Hospital and Harvard Medical School, Charlestown, Massachusetts 02129, USA
| | | | | | | |
Collapse
|
41
|
Abstract
Nitric oxide (NO) is generated by 3 major isoforms of nitric oxide synthase (NOS) with complex and overlapping patterns of expression. This article presents several examples of how gene targeted mice lacking endothelial and neuronal isoforms have showed various roles of NO. Neuronal NOS knockout mice are resistant to global and focal cerebral ischemia, confirming a role for neuronal NO in cellular toxicity after stroke. Endothelial NOS knockout mice have increased susceptibility to stroke consistent with a vascular protective effect of NO. They are hypertensive and lack endothelium dependent relaxing factor activity. Analysis of cardiac function shows roles for NO in suppression of inotropic responses to beta-adrenergic agonists and in mediating basal diastolic relaxation. Endothelial NOS knockout mice respond to vascular injury with increased neointimal proliferation, consistent with a physiological role for NO to suppress smooth muscle cell proliferation.
Collapse
Affiliation(s)
- P L Huang
- Cardiovascular Research Center and Cardiology Division, Massachusetts General Hospital, Boston, USA
| |
Collapse
|
42
|
Lau KS, Grange RW, Isotani E, Sarelius IH, Kamm KE, Huang PL, Stull JT. nNOS and eNOS modulate cGMP formation and vascular response in contracting fast-twitch skeletal muscle. Physiol Genomics 2000; 2:21-7. [PMID: 11015578 DOI: 10.1152/physiolgenomics.2000.2.1.21] [Citation(s) in RCA: 120] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Nitric oxide (NO) from Ca(2+)-dependent neuronal nitric oxide synthase (nNOS) in skeletal muscle fibers may modulate vascular tone by a cGMP-dependent pathway similar to NO derived from NOS in endothelial cells (eNOS). In isolated fast-twitch extensor digitorum longus (EDL) muscles from control mice, cGMP formation increased approximately 166% with electrical stimulation (30 Hz, 15 s). cGMP levels were not altered in slow-twitch soleus muscles. The NOS inhibitor N(omega)-nitro-l-arginine abolished the contraction-induced increase in cGMP content in EDL muscles, and the NO donor sodium nitroprusside (SNP) increased cGMP content approximately 167% in noncontracting EDL muscles. SNP treatment but not electrical stimulation increased cGMP formation in muscles from nNOS(-/-) mice. cGMP formation in control and stimulated EDL muscles from eNOS(-/-) mice was less than that obtained with similarly treated muscles from control mice. Arteriolar relaxation in contracting fast-twitch mouse cremaster muscle was attenuated in muscles from mice lacking either nNOS or eNOS. These findings suggest that increases in cGMP and NO-dependent vascular relaxation in contracting fast-twitch skeletal muscle may require both nNOS and eNOS.
Collapse
Affiliation(s)
- K S Lau
- Department of Physiology, University of Texas Southwestern Medical Center, 5323 Harry Hines Boulevard, Dallas, Texas 75235-9040, USA.
| | | | | | | | | | | | | |
Collapse
|
43
|
Wang YX, Jacob J, Wingfield PT, Palmer I, Stahl SJ, Kaufman JD, Huang PL, Huang PL, Lee-Huang S, Torchia DA. Anti-HIV and anti-tumor protein MAP30, a 30 kDa single-strand type-I RIP, shares similar secondary structure and beta-sheet topology with the A chain of ricin, a type-II RIP. Protein Sci 2000; 9:138-44. [PMID: 10739256 PMCID: PMC2144446 DOI: 10.1110/ps.9.1.138] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
MAP30 is a 30 kDa single-stranded, type-I ribosome inactivating protein (RIP) possessing anti-tumor and anti-HIV activities. It binds both ribosomal RNA and the HIV-1 long-terminal repeat DNA. To understand the structural basis for MAP30 activities, we undertook the study of MAP30 by solution NMR spectroscopy. We report nearly complete 1H, 13C, and 15N chemical shift assignments of its 263 amino acids. Based upon an analysis of secondary 13C chemical shifts, 3J(HNHA) coupling constants, hydrogen exchange data, and nuclear Overhauser effect patterns, we find that the secondary structure and beta-sheet topology of MAP30 are very similar to those of the ricin A chain, a subunit of the well-known type-II RIP, even though two proteins display distinct activities. We therefore suggest that MAP30 and ricin A chain share a similar three-dimensional fold, and that the reported functional differences between two proteins arise primarily from differences in local three-dimensional structure and other structural properties such as surface electrostatic potentials.
Collapse
Affiliation(s)
- Y X Wang
- Molecular Structural Biology Core, National Institute of Dental and Craniofacial Research, National Institutes of Health, Bethesda, Maryland 20892, USA
| | | | | | | | | | | | | | | | | | | |
Collapse
|
44
|
Rothe F, Huang PL, Wolf G. Ultrastructural localization of neuronal nitric oxide synthase in the laterodorsal tegmental nucleus of wild-type and knockout mice. Neuroscience 1999; 94:193-201. [PMID: 10613509 DOI: 10.1016/s0306-4522(99)00263-8] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
The cellular and subcellular distribution of neuronal nitric oxide synthase and its related reduced beta-nicotinamide adenine dinucleotide phosphate (NADPH)-diaphorase activity was compared in wild-type and homozygous knockout mice, in which the gene for neuronal nitric oxide synthase has been disrupted, resulting in a lack of the predominant splice isoform alpha. In the laterodorsal tegmental nucleus, used as a model structure, the cholinergic principal neurons also exhibited an intensive neuronal nitric oxide synthase immunoreactivity. Using the tetrazolium salt 2-(2-benzothiazolyl)-5-styryl-3-(4'-phthalhydrazidyl)-tetrazo++ +-lium chloride (BSPT), these neurons were filled with NADPH-diaphorase reaction product, whereas the equivalent neurons of knockout mice showed, if at all, only traces of neuronal nitric oxide synthase immunoreactivity in parallel to a diminished NADPH-diaphorase labelling. Subcellularly, the neuronal nitric oxide synthase-related diaminobenzidine product was, apparently owing to diffusion artifact, more or less evenly distributed in the cytosol of the neuronal perikarya and dendrites of wild-type mice. In contrast, the BSPT reaction product formazan was closely and discretely attached to endocellular membranes. In the intensely NADPH-diaphorase stained neurons of wild-type mice, 85% of the mitochondria were, at least partly, labelled for BSPT-formazan, whilst in the equivalent neurons of mutant mice, only 13% of mitochondria were NADPH-diaphorase positive. Related to the NADPH-diaphorase activity in the principal neurons of wild-type mice, only 10% of membranes of the endoplasmic reticulum, 27% of mitochondrial membranes and 26% of the nuclear envelope exhibited NADPH-diaphorase activity in the mutant mice. Our findings with the BSPT histochemistry suggest that residues of NADPH-diaphorase positivity in mutant mice are attributed to the alternative splice isoforms beta and/or gamma of neuronal nitric oxide synthase. The splice isoform a is located predominantly at the membranes of the endoplasmic reticulum.
Collapse
Affiliation(s)
- F Rothe
- Institute of Medical Neurobiology, University of Magdeburg, Germany.
| | | | | |
Collapse
|
45
|
Wang YX, Neamati N, Jacob J, Palmer I, Stahl SJ, Kaufman JD, Huang PL, Huang PL, Winslow HE, Pommier Y, Wingfield PT, Lee-Huang S, Bax A, Torchia DA. Solution structure of anti-HIV-1 and anti-tumor protein MAP30: structural insights into its multiple functions. Cell 1999; 99:433-42. [PMID: 10571185 DOI: 10.1016/s0092-8674(00)81529-9] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
We present the solution structure of MAP30, a plant protein with anti-HIV and anti-tumor activities. Structural analysis and subsequent biochemical assays lead to several novel discoveries. First, MAP30 acts like a DNA glycosylase/apurinic (ap) lyase, an additional activity distinct from its known RNA N-glycosidase activity toward the 28S rRNA. Glycosylase/ap lyase activity explains MAP30's apparent inhibition of the HIV-1 integrase, MAP30's ability to irreversibly relax supercoiled DNA, and may be an alternative cytotoxic pathway that contributes to MAP30's anti-HIV/anti-tumor activities. Second, two distinct, but contiguous, subsites are responsible for MAP30's glycosylase/ap lyase activity. Third, Mn2+ and Zn2+ interact with negatively charged surfaces next to the catalytic sites, facilitating DNA substrate binding instead of directly participating in catalysis.
Collapse
Affiliation(s)
- Y X Wang
- Molecular Structural Biology Laboratory, National Institute of Dental and Craniofacial Research, National Institutes of Health, Bethesda, Maryland 20892-4310, USA
| | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
46
|
Abstract
Targeted disruption of the neuronal nitric oxide synthase (nNOS) and endothelial nitric oxide synthase (eNOS) genes has led to knockout mice that lack these isoforms. These animal models have been useful to study the roles of nitric oxide (NO) in physiologic processes. nNOS knockout mice have enlarged stomachs and defects in the inhibitory junction potential involved in gastrointestinal motility. eNOS knockout mice are hypertensive and lack endothelium-derived relaxing factor activity. When these animals are subjected to models of focal ischemia, the nNOS mutant mice develop smaller infarcts, consistent with a role for nNOS in neurotoxicity following cerebral ischemia. In contrast, eNOS mutant mice develop larger infarcts, and show a more pronounced hemodynamic effect of vascular occlusion. The knockout mice also show that nNOS and eNOS isoforms differentially modulate the release of neurotransmitters in various regions of the brain. eNOS knockout mice respond to vessel injury with greater neointimal proliferation, confirming that reduced NO levels seen in endothelial dysfunction change the vessel response to injury. Furthermore, eNOS mutant mice still show a protective effect of female gender, indicating that the mechanism of this protection cannot be limited to upregulation of eNOS expression. The eNOS mutant mice also prove that eNOS modulates the cardiac contractile response to ss-adrenergic agonists and baseline diastolic relaxation. Atrial natriuretic peptide, upregulated in the hearts of eNOS mutant mice, normalizes cGMP levels and restores normal diastolic relaxation.
Collapse
Affiliation(s)
- P L Huang
- Department of Medicine, Harvard Medical School, Cardiovascular Research Center and Cardiology Division, Massachusetts General Hospital, Boston, MA 02129, USA.
| |
Collapse
|
47
|
Kriegsfeld LJ, Demas GE, Huang PL, Burnett AL, Nelson RJ. Ejaculatory abnormalities in mice lacking the gene for endothelial nitric oxide synthase (eNOS-/-). Physiol Behav 1999; 67:561-6. [PMID: 10549894 DOI: 10.1016/s0031-9384(99)00100-6] [Citation(s) in RCA: 67] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Nitric oxide (NO) has been established as a neurotransmitter in both the central and peripheral nervous systems. Three isoforms of its synthetic enzyme, NO synthase (NOS), have been identified: 1) in the endothelial lining of blood vessels (eNOS), 2) an inducible form found in macrophages (iNOS), and 3) in neurons (nNOS). Previous studies using pharmacological agents that block all three isoforms of NOS have revealed that NO mediates several aspects of reproductive physiology and behavior, including anomalies in male sexual behavior and erectile function. To determine the specific contribution of the endothelial isoform of NOS in male reproductive behavior, we studied mice missing the gene for only eNOS (eNOS-/-). Wild-type (WT) and eNOS-/- animals were placed with an estrous WT female and observed for 45 min. Both WT and eNOS-/- mice displayed equivalent motivation to mount the stimulus female. However, eNOS-/- mice exhibited striking anomalies in ejaculatory function. A higher percentage of eNOS-/- than WT mice ejaculated during the testing period (p < 0.001). This increased propensity to ejaculate was apparently due to reduced stimulation required to elicit ejaculation; eNOS-/- mice required significantly fewer mounts (p < 0.003) and intromissions (p < 0.001) to ejaculate compared to WT mice. Taken together, these results suggest that NO synthesized by eNOS may be involved in ejaculatory physiology, but not sexual motivation.
Collapse
Affiliation(s)
- L J Kriegsfeld
- Department of Psychology, The Johns Hopkins University, Baltimore, MD 21218-2686, USA
| | | | | | | | | |
Collapse
|
48
|
Drazen DL, Klein SL, Burnett AL, Wallach EE, Crone JK, Huang PL, Nelson RJ. Reproductive function in female mice lacking the gene for endothelial nitric oxide synthase. Nitric Oxide 1999; 3:366-74. [PMID: 10534440 DOI: 10.1006/niox.1999.0251] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Nitric oxide (NO) acts as a neuronal messenger in both the central and peripheral nervous systems and has been implicated in reproductive physiology and behavior. Pharmacological inhibition of nitric oxide synthase (NOS) with the nonspecific NOS inhibitor, l-N(G)-nitro-Arg-methyl ester (l-NAME), induced deficits in both the number of ovarian rupture sites and the number of oocytes recovered in the oviducts of mice. Female neuronal NOS knockout (nNOS-/-) mice have normal numbers of rupture sites, but reduced numbers of oocytes recovered following systemic injections of gonadotropins, suggesting that NO produced by nNOS accounts, in part, for deficits in ovulatory efficiency observed after l-NAME administration. Additionally, endothelial NOS knockout (eNOS-/-) mice have reduced numbers of ovulated oocytes after superovulation. Because endothelial NOS has been identified in ovarian follicles, and because of the noted reduced breeding efficiency of eNOS-/- mice, the present study sought to determine the role of NO from eNOS in mediating the number of rupture sites present after ovulation. Estrous cycle length and variability were consistently reduced in eNOS-/- females. The number of rupture sites was normal in eNOS-/- mice under natural conditions and after administration of exogenous GnRH. After exogenous gonadotropin administration, eNOS-/- females displayed a significant reduction in the number of ovarian rupture sites. Female eNOS-/- mice also produced fewer pups/litter compared to WT mice. These data suggest that NO from endothelial sources might play a role in mediating rodent ovulation and may be involved in regulation of the timing of the estrous cycle.
Collapse
Affiliation(s)
- D L Drazen
- Departments of Psychology and Neuroscience, The Johns Hopkins University, Baltimore, Maryland, 21218, USA.
| | | | | | | | | | | | | |
Collapse
|
49
|
Huang PL, Sun Y, Chen HC, Kung HF, Lee-Huang S. Proteolytic fragments of anti-HIV and anti-tumor proteins MAP30 and GAP31 are biologically active. Biochem Biophys Res Commun 1999; 262:615-23. [PMID: 10471373 DOI: 10.1006/bbrc.1999.1213] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
We analyzed the structural and functional organization of anti-HIV and anti-tumor proteins MAP30 and GAP31 by limited proteolysis with endopeptidases Lys-C and Glu-C (V8). MAP30 and GAP31 are resistant to proteolytic digestion under conditions of as much as 5% (w/w) proteases. In the presence of 10% (w/w) protease, the central regions of the proteins are still resistant to proteolysis, whereas the N- and C-termini are accessible. Peptide fragments were purified by FPLC on Superdex 75 columns, characterized by gel electrophoresis, identified by amino acid sequencing, and analyzed for anti-HIV, anti-tumor, and other biochemical activities. We report here that limited proteolysis yields biologically active fragments of both MAP30 and GAP31. These fragments are active against HIV-1 and tumor cells with EC(50)s in the sub-nanomolar ranges, 0.2-0.4 nM. At the dose levels used in the assays, little cytotoxicity to normal cells was observed. In addition, these fragments remain fully active in HIV-integrase inhibition and HIV-LTR topological inactivation, but not ribosome inactivation. These results demonstrate that the antiviral and anti-tumor activities of MAP30 and GAP31 are independent of ribosome inactivation activity. In addition, we demonstrate that portions of the N- and C-termini are not essential for antiviral and anti-tumor activities, but do appear to be required for ribosome inactivation. These results may provide novel strategies for rational design and targeted development of mimetic antiviral and anti-tumor therapeutics.
Collapse
Affiliation(s)
- P L Huang
- American Biosciences, New York, New York, 10021, USA
| | | | | | | | | |
Collapse
|
50
|
Zhang L, Fishman MC, Huang PL. Estrogen mediates the protective effects of pregnancy and chorionic gonadotropin in a mouse model of vascular injury. Arterioscler Thromb Vasc Biol 1999; 19:2059-65. [PMID: 10479646 DOI: 10.1161/01.atv.19.9.2059] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
To determine why pregnancy protects against intimal proliferation in a mouse model of vessel injury, we administered chorionic gonadotropin to intact and ovariectomized female mice. Chorionic gonadotropin markedly suppressed intimal proliferation in intact but not in ovariectomized female mice, indicating that the protective effects of chorionic gonadotropin require ovarian function. To test whether estrogen or progesterone might mediate the protective effects of pregnancy and chorionic gonadotropin, we administered estrogen and progesterone to ovariectomized mice. Estrogen administration to ovariectomized mice to achieve the elevated levels seen in pregnancy was sufficient to reproduce the marked suppression of intimal proliferation in response to vessel injury. Progesterone administration reduced intimal proliferation to a lesser degree and was correlated with increases in estrogen to levels seen in nonpregnant female mice. Staining for proliferating cell nuclear antigen suggested that estrogen reduced medial and intimal cell proliferation. Both the classic estrogen receptor-alpha and the recently discovered estrogen receptor-beta are present in vascular tissue as assessed by immunohistochemistry, providing a possible mechanism for the effects of estrogen. These results suggest that the protective effects of estrogen do not plateau at levels seen in normal females but increase further with estrogen levels up through levels seen during pregnancy.
Collapse
Affiliation(s)
- L Zhang
- Cardiovascular Research Center and Cardiology Division, Massachusetts General Hospital, Boston, USA
| | | | | |
Collapse
|