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Belle JI, Sen D, Baer JM, Liu X, Lander VE, Ye J, Sells BE, Knolhoff BL, Faiz A, Kang LI, Qian G, Fields RC, Ding L, Kim H, Provenzano PP, Stewart SA, DeNardo DG. Senescence Defines a Distinct Subset of Myofibroblasts That Orchestrates Immunosuppression in Pancreatic Cancer. Cancer Discov 2024:OF1-OF32. [PMID: 38683683 DOI: 10.1158/2159-8290.cd-23-0428] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2023] [Revised: 01/29/2024] [Accepted: 03/08/2024] [Indexed: 05/01/2024]
Abstract
Pancreatic ductal adenocarcinoma (PDAC) therapeutic resistance is largely attributed to a unique tumor microenvironment embedded with an abundance of cancer-associated fibroblasts (CAF). Distinct CAF populations were recently identified, but the phenotypic drivers and specific impact of CAF heterogeneity remain unclear. In this study, we identify a subpopulation of senescent myofibroblastic CAFs (SenCAF) in mouse and human PDAC. These SenCAFs are a phenotypically distinct subset of myofibroblastic CAFs that localize near tumor ducts and accumulate with PDAC progression. To assess the impact of endogenous SenCAFs in PDAC, we used an LSL-KRASG12D;p53flox;p48-CRE;INK-ATTAC (KPPC-IA) mouse model of spontaneous PDAC with inducible senescent cell depletion. Depletion of senescent stromal cells in genetic and pharmacologic PDAC models relieved immune suppression by macrophages, delayed tumor progression, and increased responsiveness to chemotherapy. Collectively, our findings demonstrate that SenCAFs promote PDAC progression and immune cell dysfunction. SIGNIFICANCE CAF heterogeneity in PDAC remains poorly understood. In this study, we identify a novel subpopulation of senescent CAFs that promotes PDAC progression and immunosuppression. Targeting CAF senescence in combination therapies could increase tumor vulnerability to chemo- or immunotherapy. See related article by Ye et al.
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Affiliation(s)
- Jad I Belle
- Department of Medicine, Washington University School of Medicine, St. Louis, Missouri
| | - Devashish Sen
- Department of Medicine, Washington University School of Medicine, St. Louis, Missouri
| | - John M Baer
- Department of Medicine, Washington University School of Medicine, St. Louis, Missouri
| | - Xiuting Liu
- Department of Medicine, Washington University School of Medicine, St. Louis, Missouri
| | - Varintra E Lander
- Department of Medicine, Washington University School of Medicine, St. Louis, Missouri
| | - Jiayu Ye
- Department of Cell Biology and Physiology, Washington University School of Medicine, St. Louis, Missouri
| | - Blake E Sells
- Department of Medicine, Washington University School of Medicine, St. Louis, Missouri
| | - Brett L Knolhoff
- Department of Medicine, Washington University School of Medicine, St. Louis, Missouri
| | - Ahmad Faiz
- Department of Medicine, Washington University School of Medicine, St. Louis, Missouri
| | - Liang-I Kang
- Department of Medicine, Washington University School of Medicine, St. Louis, Missouri
- Department of Pathology and Immunology, Washington University School of Medicine, St. Louis, Missouri
- Siteman Cancer Center, Washington University School of Medicine, St. Louis, Missouri
| | - Guhan Qian
- Department of Biomedical Engineering, University of Minnesota, Minneapolis, Minnesota
- Department of Hematology, Oncology, and Transplantation, University of Minnesota, Minneapolis, Minnesota
| | - Ryan C Fields
- Siteman Cancer Center, Washington University School of Medicine, St. Louis, Missouri
- Department of Surgery, Washington University School of Medicine, St. Louis, Missouri
| | - Li Ding
- Department of Medicine, Washington University School of Medicine, St. Louis, Missouri
| | - Hyun Kim
- Siteman Cancer Center, Washington University School of Medicine, St. Louis, Missouri
- Department of Radiation Oncology, Washington University School of Medicine, St. Louis, Missouri
| | - Paolo P Provenzano
- Department of Biomedical Engineering, University of Minnesota, Minneapolis, Minnesota
- Department of Hematology, Oncology, and Transplantation, University of Minnesota, Minneapolis, Minnesota
| | - Sheila A Stewart
- Department of Cell Biology and Physiology, Washington University School of Medicine, St. Louis, Missouri
- Siteman Cancer Center, Washington University School of Medicine, St. Louis, Missouri
| | - David G DeNardo
- Department of Medicine, Washington University School of Medicine, St. Louis, Missouri
- Department of Pathology and Immunology, Washington University School of Medicine, St. Louis, Missouri
- Siteman Cancer Center, Washington University School of Medicine, St. Louis, Missouri
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Chen S, Diao HX, Zhao YQ, Jiang ZC, Liu K, Zhang ZY, A X, Ling WW, Qian G. [The predictive value of microvascular obstruction for adverse left ventricular remodeling after primary percutaneous coronary intervention in patients with acute ST-elevation myocardial infarction: a prospective study]. Zhonghua Nei Ke Za Zhi 2023; 62:1458-1464. [PMID: 38044073 DOI: 10.3760/cma.j.cn112138-20221220-00944] [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] [Subscribe] [Scholar Register] [Indexed: 12/05/2023]
Abstract
Objectives: Microvascular obstruction (MVO) is a specific cardiac magnetic resonance (CMR) imaging feature in patients with acute myocardial infarction. The purpose of this study was to elucidate the predictive value of MVO in left ventricular adverse remodeling after primary percutaneous coronary intervention (PCI) in patients with acute ST-elevation myocardial infarction (STEMI). Methods: A total of 167 patients with STEMI undergoing primary PCI in the Chinese PLA General Hospital from 2016 to 2020 were enrolled in this prospective cohort study, the average age of study patients was 57±10 years old, with 151 males (90.4%) and 16 females (9.6%). The patients were divided into the MVO group (n=81) and non-MVO group (n=86) according to the presence or absence of MVO on CMR imaging, respectively. The primary endpoint of the study was the occurrence of left ventricular adverse remodeling, which was defined as an increase in left ventricular end diastolic volume (LVEDV) by >20% at 6 months after primary PCI compared with the baseline. Patients who completed follow-up were diagnosed as left ventricular adverse remodeling or no left ventricular adverse remodeling according to CMR. The baseline data, perioperative data, and related data of end points were compared between the MVO group and non-MVO group. Finally, the predictive value of MVO in left ventricular adverse remodeling was calculated by receiver operating characteristic curve analysis. Results: In the baseline data, preoperative thrombolysis in myocardial infarction (TIMI) flow (χ2=13.74, P=0.003) and postoperative TIMI flow (χ2=14.87, P=0.001) were both obviously decreased in the MVO group. After 6 months of follow-up, the incidence of left ventricular adverse remodeling in the MVO group was significantly higher than that in the non-MVO group [37.0%(27/73) vs. 18.9%(14/74), χ2=5.96, P=0.015]. The left ventricular end systolic volume at 6 months post infarction in the MVO group was significantly larger than that in the non-MVO group [(94±32) vs. (68±20) ml, t=-5.98, P<0.001], as well as the LVEDV [(169±38) vs. (143±29) ml, t=-4.74, P<0.001]. Receiver operating characteristic curve showed that the area under the curve of MVO size for predicting left ventricular adverse remodeling was 0.637. Conclusion: The risk of left ventricular adverse remodeling is significantly increased in patients with MVO after primary PCI for acute STEMI.
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Affiliation(s)
- S Chen
- Department of Cardiology, the First Medical Center of Chinese PLA General Hospital, Beijing 100853, China
| | - H X Diao
- Department of Cardiology, the First Medical Center of Chinese PLA General Hospital, Beijing 100853, China
| | - Y Q Zhao
- Department of Cardiology, the First Medical Center of Chinese PLA General Hospital, Beijing 100853, China
| | - Z C Jiang
- Department of Cardiology, the First Medical Center of Chinese PLA General Hospital, Beijing 100853, China
| | - K Liu
- Department of Cardiology, the First Medical Center of Chinese PLA General Hospital, Beijing 100853, China
| | - Z Y Zhang
- Department of Cardiology, the First Medical Center of Chinese PLA General Hospital, Beijing 100853, China
| | - X A
- Department of Cardiology, the First Medical Center of Chinese PLA General Hospital, Beijing 100853, China
| | - W W Ling
- Department of Cardiology, the First Medical Center of Chinese PLA General Hospital, Beijing 100853, China
| | - G Qian
- Department of Cardiology, the First Medical Center of Chinese PLA General Hospital, Beijing 100853, China
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Heussner RK, Zhang H, Qian G, Baker MJ, Provenzano PP. Differential contractility regulates cancer stem cell migration. Biophys J 2023; 122:1198-1210. [PMID: 36772795 PMCID: PMC10111274 DOI: 10.1016/j.bpj.2023.02.008] [Citation(s) in RCA: 1] [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] [Received: 12/16/2021] [Revised: 10/22/2022] [Accepted: 02/07/2023] [Indexed: 02/11/2023] Open
Abstract
Cancer stem cells (CSCs) are known to have a high capacity for tumor initiation and the formation of metastases. We have previously shown that in collagen constructs mimetic of aligned extracellular matrix architectures observed in carcinomas, breast CSCs demonstrate enhanced directional and total motility compared with more differentiated carcinoma populations. Here, we show that CSCs maintain increased motility in diverse environments including on 2D elastic polyacrylamide gels of various stiffness, 3D randomly oriented collagen matrices, and ectopic cerebral slices representative of a common metastatic site. A consistent twofold increase of CSC motility across platforms suggests a general shift in cell migration mechanics between well-differentiated carcinoma cells and their stem-like counterparts. To further elucidate the source of differences in migration, we demonstrate that CSCs are less contractile than the whole population (WP) and develop fewer and smaller focal adhesions and show that enhanced CSC migration can be tuned via contractile forces. The WP can be shifted to a CSC-like migratory phenotype using partial myosin II inhibition. Inversely, CSCs can be shifted to a less migratory WP-like phenotype using microtubule-destabilizing drugs that increase contractility or by directly enhancing contractile forces. This work begins to reveal the mechanistic differences driving CSC migration and raises important implications regarding the potentially disparate effects of microtubule-targeting agents on the motility of different cell populations.
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Affiliation(s)
- Rachel K Heussner
- Department of Biomedical Engineering, University of Minnesota, Minneapolis, Minnesota; University of Minnesota Physical Sciences in Oncology Center, Minneapolis, Minnesota
| | - Hongrong Zhang
- Department of Biomedical Engineering, University of Minnesota, Minneapolis, Minnesota; University of Minnesota Physical Sciences in Oncology Center, Minneapolis, Minnesota; University of Minnesota Center for Multiparametric Imaging of Tumor Immune Microenvironments, Minneapolis, Minnesota
| | - Guhan Qian
- Department of Biomedical Engineering, University of Minnesota, Minneapolis, Minnesota; University of Minnesota Physical Sciences in Oncology Center, Minneapolis, Minnesota; University of Minnesota Center for Multiparametric Imaging of Tumor Immune Microenvironments, Minneapolis, Minnesota
| | - Mikayla J Baker
- Department of Biomedical Engineering, University of Minnesota, Minneapolis, Minnesota; University of Minnesota Physical Sciences in Oncology Center, Minneapolis, Minnesota; University of Minnesota Center for Multiparametric Imaging of Tumor Immune Microenvironments, Minneapolis, Minnesota
| | - Paolo P Provenzano
- Department of Biomedical Engineering, University of Minnesota, Minneapolis, Minnesota; University of Minnesota Physical Sciences in Oncology Center, Minneapolis, Minnesota; University of Minnesota Center for Multiparametric Imaging of Tumor Immune Microenvironments, Minneapolis, Minnesota; Masonic Cancer Center, University of Minnesota, Minneapolis, Minnesota; Department of Hematology, Oncology, and Transplantation, University of Minnesota, Minneapolis, Minnesota; Institute for Engineering in Medicine, University of Minnesota, Minneapolis, Minnesota; Stem Cell Institute, University of Minnesota, Minneapolis, Minnesota.
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Cui JG, Jin QH, Wu X, Yang X, Qian G, Chen YD. [Protection of side-branch ostium by the jailed balloon technique validated by three-dimensional optical coherence tomography]. Zhonghua Xin Xue Guan Bing Za Zhi 2023; 51:136-142. [PMID: 36789592 DOI: 10.3760/cma.j.cn112148-20220927-00751] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 02/16/2023]
Abstract
Objective: To evaluate the protective effect of jailed balloon technique on side branch (SB) ostium using three-dimensional optical coherence tomography(OCT). Methods: This is a retrospective study. Consecutive coronary disease patients with coronary artery bifurcation lesions who underwent percutaneous coronary intervention (PCI) and completed pre-and post-procedural OCT examinations at the Chinese People's Liberation Army General Hospital from September 2019 to March 2022 were enrolled. Patients were divided into the jailed balloon technique group and the unprotected group according to the options applied for the SB. The SB ostium area difference was calculated from OCT images (SB ostium area difference=post-PCI SB ostium area-pre-PCI SB ostium area). The SB ostium area differences were compared between the two groups and compared further in the subgroup of true bifurcation lesions and non-true bifurcation lesions. In the jailed balloon group, the SB ostium area difference was compared between the active jailed balloon technique and the conventional jailed balloon technique, between the jailed balloon>2.0 mm diameter and the jailed balloon≤2.0 mm diameter, and between the higher balloon pressure (>4 atm, 1 atm=101.325 kPa) and the lower balloon pressure (≤4 atm). Multivariate linear regression analysis was used to explore the correlation between the technical parameters of the jailed balloon technique and the SB protection effect. Results: A total of 176 patients with 236 bifurcation lesions were enrolled, aged (60.7±9.3) years, and there were 128 male patients (72.7%). There were 67 patients in the jailed balloon technique group with 71 bifurcation lesions and 123 patients in the unprotected group with 165 bifurcation lesions. Fourteen patients had 2 to 3 lesions, which were treated in different ways, so they appeared in the unprotected group and the jailed balloon technique group at the same time. The area difference in SB ostium was greater in the jailed balloon group than in the unprotected group (0.07 (-0.43, 1.05)mm2 vs.-0.33 (-0.83, 0.26)mm2, P<0.001), and the results were consistent in the true bifurcation lesion subgroup (0.29 (-0.35, 0.96)mm2 vs.-0.26 (-0.64, 0.29)mm2, P=0.004), while the difference between the two groups in the non-true bifurcation lesion subgroup was not statistically significant (P=0.136). In the jailed balloon technique group, the SB ostium area difference was greater in patients treated with the active jailed balloon technique than in those treated with the conventional jailed balloon technique ((0.43±1.36)mm2 vs. (-0.22±0.52)mm2, P=0.013). The difference in SB ostium area was greater in those using>2.0 mm diameter jailed balloons than in those using≤2.0 mm diameter jailed balloons (0.25 (-0.51, 1.31) mm2 vs.-0.01 (-0.45, 0.63) mm2, P=0.020), while SB ostium area difference was similar between those endowed with higher balloon pressure (>4 atm) compared to those with lower balloon pressure (≤4 atm) (P=0.731). Multivariate linear regression analysis showed that there was a positive correlation between jailed balloon diameter and SB ostium area difference (r=0.344, P=0.019). Conclusions: The jailed balloon technique significantly protects SB ostium, especially in patients with true bifurcation lesions. The active jailed balloon technique and larger diameter balloons may provide more protection to the SB.
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Affiliation(s)
- J G Cui
- School of Medicine, Nankai University, Tianjin 300071, China Department of Cardiology, General Hospital of Chinese People's Liberation Army, Beijing 100853, China
| | - Q H Jin
- Department of Cardiology, General Hospital of Chinese People's Liberation Army, Beijing 100853, China
| | - X Wu
- Chinese People's Liberation Army Medical School, Beijing 100853, China
| | - X Yang
- Department of Cardiology, General Hospital of Chinese People's Liberation Army, Beijing 100853, China
| | - G Qian
- Department of Cardiology, General Hospital of Chinese People's Liberation Army, Beijing 100853, China
| | - Y D Chen
- Department of Cardiology, General Hospital of Chinese People's Liberation Army, Beijing 100853, China
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DI Iorio M, Cook C, Vanni K, Patel N, D’silva K, Fu X, Wang J, Prisco L, Kowalski E, Zaccardelli A, Martin L, Qian G, Hsu T, Wallace Z, Sparks J. POS1234 DMARD DISRUPTION, INCREASED DISEASE ACTIVITY, AND PROLONGED SYMPTOM DURATION AFTER ACUTE COVID-19 AMONG PATIENTS WITH RHEUMATIC DISEASE: A PROSPECTIVE STUDY. Ann Rheum Dis 2022. [DOI: 10.1136/annrheumdis-2022-eular.2718] [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: 11/03/2022]
Abstract
BackgroundSystemic autoimmune rheumatic disease (SARD) patients may be at risk for disease flare and prolonged symptom duration after COVID-19, perhaps related to DMARD disruption and immune activation.ObjectivesTo describe DMARD disruption and identify differences in SARD activity among patients with and without prolonged COVID-19 symptom duration.MethodsWe identified all SARD patients with confirmed COVID-19 at the Mass General Brigham healthcare system in Boston, USA; prospective recruitment is ongoing. Surveys were used to collect demographics, clinical characteristics, DMARD disruption, COVID-19 course, and SARD disease activity before and after COVID-19. The survey included validated instruments measuring disease activity, pain, fatigue, functional status, and respiratory quality of life. Prolonged symptom duration was defined as COVID-19 symptoms lasting ≥28 days. We compared differences in patient-reported measures between those with and without prolonged symptoms.ResultsWe analyzed survey responses from 174 COVID-19 survivors with SARDs (mean age 52±16 years, 81% female, 80% White). The most common SARDs were RA (40%) and SLE (14%). Fifty-one percent of the 127 respondents on any DMARD reported a disruption to their regimen at COVID-19 onset (Figure 1). Among individual DMARDs, 56-77% were reported to have any change, except for hydroxychloroquine (23%) and rituximab (46%). SARD flare after COVID-19 was reported by 41% of respondents (Table 1). Patient global assessment of SARD activity was worse after COVID-19 (mean 7.6±2.3 before vs. 6.6±2.9 after COVID-19, p<0.001). Prolonged symptom duration was reported by 45% of participants. Those with prolonged symptoms had a higher initial COVID-19 symptom count (median 7 vs. 4, p<0.001) and were more likely to be hospitalized for COVID-19 (28% vs. 17%, p=0.001). Respondents experiencing prolonged symptom duration had higher disease activity on RAPID3 (p=0.007) as well as more pain (p<0.001) and fatigue (p=0.03) compared to those without prolonged symptoms.Table 1.Acute COVID-19 course, SARD flare/activity, and patient-reported outcomes among COVID-19 survivors with SARDs.All COVID-19 survivors with SARDs (n=174)Prolonged symptom duration ≥28 days (n=78)No prolonged symptom duration/(n=96)p-value (prolonged vs. not)Acute COVID-19 courseCOVID-19 symptom duration, days, median [IQR]14 [9, 29]46 [30, 65]11 [7, 14]<0.0001Initial symptom count, median [IQR]6 [3, 8]7 [6, 9]4 [2, 7]<0.001Hospitalized, n (%)38 (22)22 (28)16 (17)0.001SARD flare/activitySelf-reported SARD flare after COVID-19, n (%)71 (41)38 (49)33 (34)0.15Disease activity by RAPID3, median [IQR]9 [4, 14]11.2 [6, 16]7 [3, 13]0.0067RAPID3 categorical score, n (%)0.13Remission (0)11 (7)4 (5)7 (7)Near remission (0.3-1.0)23 (14)5 (7)18 (19)Low severity (1.3-2.0)26 (15)10 (14)16 (17)Moderate severity (2.3-4.0)55 (33)27 (36)28 (29)High severity (4.3-10.0)54 (32)28 (38)26 (27)Patient-reported outcomesPain by SF-MPQ, median [IQR]2 [1, 2]2 [1, 2]1 [0, 2]0.0008Fatigue by FSI, median [IQR]53 [27, 84]66 [31, 91.5]43 [26, 76]0.031mHAQ, median [IQR]0.125 [0, 0.38]0.25 [0, 0.75]0.125 [0, 0.38]0.11Respiratory quality of life by SGRQ, global [IQR]15 [4, 29]16 [4, 36]10 [4, 26]0.49RAPID3, Routine Assessment of Patient Index Data 3; SF-MPQ, Short-form McGill Pain Questionnaire; FSI, Fatigue Symptom Inventory; mHAQ, modified Health Assessment Questionnaire; SGRQ, Saint George’s Respiratory Questionnaire.Figure 1.Frequency of baseline DMARD use and proportion with any disruption at COVID-19 onset.ConclusionDMARD disruption, SARD flare, and prolonged symptoms were common in this prospective study of COVID-19 survivors with SARDs. Those with prolonged COVID-19 symptom duration, defined as ≥28 days, had higher SARD activity, more pain, and more fatigue compared to those without prolonged symptoms. These findings suggest that post-acute sequelae of COVID-19 may have a large impact on underlying SARD activity and quality of life.Disclosure of InterestsMichael Di Iorio: None declared, Claire Cook: None declared, Kathleen Vanni: None declared, Naomi Patel Consultant of: Receives consulting fees from FVC Health unrelated to this work., Kristin D’Silva: None declared, Xiaoqing Fu: None declared, Jiaqi Wang: None declared, Lauren Prisco: None declared, Emily Kowalski: None declared, Alessandra Zaccardelli: None declared, Lily Martin: None declared, Grace Qian: None declared, Tiffany Hsu: None declared, Zachary Wallace Consultant of: Receives consulting fees from Viela Bio, Zenas BioPharma, and MedPace unrelated to this work., Grant/research support from: Receives research support from Bristol-Myers Squibb and Principia/Sanofi., Jeffrey Sparks Consultant of: Receives consultant fees from AbbVie, Amgen, Boehringer Ingelheim, Bristol Myers Squibb, Gilead, Inova Diagnostics, Janssen, Optum, and Pfizer unrelated to this work., Grant/research support from: Receives research support from Bristol Myers Squibb.
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Gilbert E, Figueroa-Parra G, Valenzuela-Almada M, Vallejo S, Neville MR, Patel N, Cook C, Fu X, Hagi R, McDermott G, Di Iorio M, Masto L, Vanni K, Kowalski E, Qian G, Wallace Z, Duarte-Garcia A, Sparks J. OP0251 IMPACT OF INTERSTITIAL LUNG DISEASE ON SEVERE COVID-19 OUTCOMES FOR PATIENTS WITH RHEUMATOID ARTHRITIS: A MULTICENTER STUDY. Ann Rheum Dis 2022. [DOI: 10.1136/annrheumdis-2022-eular.2973] [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: 11/04/2022]
Abstract
BackgroundRA has been associated with poor COVID-19 outcomes, but few studies have investigated outcomes in RA features such as interstitial lung disease.ObjectivesTo assess COVID-19 outcomes in patients with RA overall, and those with and without ILD, compared to general population comparators.MethodsA multicenter, retrospective cohort study was conducted at Mayo Clinic (19 hospitals and affiliated outpatient centers in 4 states) and Mass General Brigham (14 hospitals and affiliated outpatient centers in New England). Consecutive patients with RA meeting ACR/EULAR criteria and a positive COVID-19 test from March 1, 2020 through June 6, 2021 were matched 1:5 on age, sex, race, and COVID-19 test date with general population comparators without RA. RA features assessed included: RA-ILD per Bongartz criteria [1], duration, rheumatoid factor (RF), cyclic citrullinated peptide antibody (CCP), bone erosions, and treatments. The primary outcome was a composite of hospitalization or death following COVID-19 diagnosis. We used multivariable Cox regression to investigate the association of RA, and features such as ILD, with COVID-19 outcomes compared to matched comparators.ResultsWe analyzed 582 patients with RA and 2892 comparators without RA, all with COVID-19. Mean age was 62 years, 51% were female, and 79% were White. Mean RA duration was 11 years, 67% were seropositive (52% RF+ and 54% CCP+), 27% had bone erosions, 28% were on steroids, and 79% were on DMARDs. 50/582 (9%) patients with RA had ILD.The COVID-19 hospitalization or death rate for RA patients was higher than comparators (3.0 per 1,000 days [95% CI 2.5-3.6] vs. 1.9 per 1,000 days [95% CI 1.7-2.1], respectively). Overall, RA patients had a 53% higher risk of hospitalization or death than comparators after adjustment (95% CI 1.20-1.94).Among those with RA-ILD, the hospitalization or death rate was significantly higher than comparators (10.9 [95% CI 6.7-15.2] vs. 2.5 per 1,000 days [1.8-3.2], respectively). RA-ILD was associated with nearly 3-fold higher risk for hospitalization or death than comparators (multivariable HR 2.84 [95% CI 1.64-4.91], Table 1). There was a significant interaction between RA/comparator status and presence/absence of ILD for risk of severe COVID-19 (p<0.001, Figure 1). The elevated risk for severe COVID-19 was similar for RA subgroups defined by serostatus or bone erosions.Table 1.Frequencies, proportions, and hazard ratios for COVID-19 outcomes, comparing all RA patients, and subgroups with or without RA-ILD, to matched comparators.COVID-19 OutcomesAll RA Patients (n=582)RA-ILD (n=50)RA Patients without ILD (n=532)Comparators (n=2,892)Hospitalization, n (%)121 (21)24 (48)97 (18)402 (14)Unadjusted HR (95% CI)1.58 (1.27, 1.96)2.65 (1.71, 4.09)1.43 (1.12, 1.82)Ref.Adjusted* HR (95% CI)1.45 (1.14, 1.83)2.35 (1.38, 4.00)1.31 (1.00, 1.70)Ref.Death, n (%)26 (4)9 (18)17 (3)63 (2)Unadjusted HR (95% CI)1.72 (0.98, 3.01)5.88 (2.07, 16.71)1.13 (0.56, 2.29)Ref.Adjusted* HR (95% CI)1.24 (0.66, 2.32)13.94 (4.30, 45.18)0.75 (0.35, 1.63)Ref.Hospitalization or death, n (%)126 (22)25 (50)101 (19)419 (14)Unadjusted HR (95% CI)1.66 (1.33, 2.07)3.01 (1.93, 4.70)1.47 (1.14, 1.89)Ref.Adjusted* HR (95% CI)1.53 (1.20, 1.94)2.84 (1.64, 4.91)1.34 (1.02, 1.77)Ref.*Adjusted for age, sex, race, and smokingFigure 1.Multivariable hazard ratios for the composite outcome of hospitalization or death from COVID-19, comparing all RA and subgroups by serostatus, bone erosions, and ILD to matched comparators without RA.ConclusionWe confirmed that RA was associated with severe COVID-19 outcomes compared to the general population. We found evidence that ILD may be an effect modifier for the relationship between RA and severe COVID-19 outcomes, but RA subgroups defined by serostatus and bone erosions had similarly elevated risk. These findings suggest that ILD or its treatment may be a major contributor to severe COVID-19 outcomes in RA.References[1]Bongartz, T, et al, Arthritis Rheum. 2010 Jun;62(6):1583-91.Disclosure of InterestsNone declared
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Chen W, Yang X, Zhou Y, Ma Q, Wu X, Sha Y, Qian G. [Bax inhibitor-1 inhibits calcification of vascular smooth muscle cells in vitro]. Nan Fang Yi Ke Da Xue Xue Bao 2021; 41:1177-1182. [PMID: 34549708 DOI: 10.12122/j.issn.1673-4254.2021.08.08] [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: 11/24/2022]
Abstract
OBJECTIVE To investigate the effect of Bax inhibitor-1(BI-1)on calcification of vascular smooth muscle cells(VSMCs). METHODS VSMCs were isolated from the thoracic aorta of SD rats.VSMCs or BI-1-overexpressing VSMCs(transfected with a BI-1-overexpressing plasmid) were cultured in normal medium or calcified medium containing β-glycerophosphate and calcium chloride, and the cell calcification was examined with Alizarin red staining.Enzyme-linked immunosorbent assay was used to determine the intracellular calcium content and alkaline phosphatase activity.The expression levels of Runt-related transcription factor 2 (RUNX2), bone morphogenetic protein 2 (BMP-2) and caspase-3 were detected with Western blotting. RESULTS After 14 days of culture in the calcified medium, the VSMCs showed significantly reduced expression of BI-1 protein(P=0.001).BI-1 overexpression in the VSMCs caused a significant reduction of calcium level and alkaline phosphatase activities(P=0.0006) and lowered the expression levels of RUNX2 and BMP-2 (P=0.0001) in the cells.The VSMCs with induced calcification exhibited a significantly increased apoptosis rate, but BI-1 overexpression obviously inhibited VSMC apoptosis in the calcified medium (P=0.0003). CONCLUSION BI-1 may attenuate vascular calcification by inhibiting calcium deposition, osteogenic differentiation and apoptosis.
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Affiliation(s)
- W Chen
- Department of Cardiology, Beijing Anzhen Hospital of Capital Medical University, Beijing Institute of Heart, Lung and Blood Vessel Disease, Beijing Key Laboratory of Precision Medicine of Coronary Atherosclerotic Disease, Beijing 100029, China.,Department of Cardiology, Second Medical Center, General Hospital of PLA, Beijing 100853, China
| | - X Yang
- Department of Cardiology, First Medical Center, General Hospital of PLA, Beijing 100853, China
| | - Y Zhou
- Department of Cardiology, Beijing Anzhen Hospital of Capital Medical University, Beijing Institute of Heart, Lung and Blood Vessel Disease, Beijing Key Laboratory of Precision Medicine of Coronary Atherosclerotic Disease, Beijing 100029, China
| | - Q Ma
- Department of Cardiology, Beijing Anzhen Hospital of Capital Medical University, Beijing Institute of Heart, Lung and Blood Vessel Disease, Beijing Key Laboratory of Precision Medicine of Coronary Atherosclerotic Disease, Beijing 100029, China
| | - X Wu
- Department of Cardiology, Second Medical Center, General Hospital of PLA, Beijing 100853, China
| | - Y Sha
- Department of Cardiology, Second Medical Center, General Hospital of PLA, Beijing 100853, China
| | - G Qian
- Department of Cardiology, First Medical Center, General Hospital of PLA, Beijing 100853, China
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8
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Tang X, Suddarth S, Qian G, Garwood M. Ultra-low frequency EPR using longitudinal detection and fictitious-field modulation. J Magn Reson 2020; 321:106855. [PMID: 33186882 PMCID: PMC7718292 DOI: 10.1016/j.jmr.2020.106855] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/17/2020] [Revised: 10/18/2020] [Accepted: 10/19/2020] [Indexed: 06/11/2023]
Abstract
When viewed in a rotating frame of reference, a transverse-plane radiofrequency (RF) field manifests as a longitudinal field component called the fictitious field. By modulating the RF field and thus the fictitious field, detectable longitudinal magnetization patterns have previously been shown to be measurable. By combining fictitious-field modulation and longitudinal detection, here we demonstrate EPR spectroscopy and one-dimensional imaging in a custom-built longitudinal detection system operating at an ultra-low frequency (24 MHz) for detecting electron spins with short (~nanoseconds) relaxation times. Simultaneous transmit and receive with low transmitter leakage level (~80 dB isolation) is also demonstrated.
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Affiliation(s)
- Xueyan Tang
- Center for Magnetic Resonance Research and Department of Radiology, University of Minnesota, 2021 6(th) Street SE, Minneapolis, MN 55455, USA
| | - Steven Suddarth
- Center for Magnetic Resonance Research and Department of Radiology, University of Minnesota, 2021 6(th) Street SE, Minneapolis, MN 55455, USA
| | - Guhan Qian
- Center for Magnetic Resonance Research and Department of Radiology, University of Minnesota, 2021 6(th) Street SE, Minneapolis, MN 55455, USA
| | - Michael Garwood
- Center for Magnetic Resonance Research and Department of Radiology, University of Minnesota, 2021 6(th) Street SE, Minneapolis, MN 55455, USA.
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9
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Fan F, Shan H, Kalra MK, Singh R, Qian G, Getzin M, Teng Y, Hahn J, Wang G. Quadratic Autoencoder (Q-AE) for Low-Dose CT Denoising. IEEE Trans Med Imaging 2020; 39:2035-2050. [PMID: 31902758 PMCID: PMC7376975 DOI: 10.1109/tmi.2019.2963248] [Citation(s) in RCA: 38] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
Inspired by complexity and diversity of biological neurons, our group proposed quadratic neurons by replacing the inner product in current artificial neurons with a quadratic operation on input data, thereby enhancing the capability of an individual neuron. Along this direction, we are motivated to evaluate the power of quadratic neurons in popular network architectures, simulating human-like learning in the form of "quadratic-neuron-based deep learning". Our prior theoretical studies have shown important merits of quadratic neurons and networks in representation, efficiency, and interpretability. In this paper, we use quadratic neurons to construct an encoder-decoder structure, referred as the quadratic autoencoder, and apply it to low-dose CT denoising. The experimental results on the Mayo low-dose CT dataset demonstrate the utility and robustness of quadratic autoencoder in terms of image denoising and model efficiency. To our best knowledge, this is the first time that the deep learning approach is implemented with a new type of neurons and demonstrates a significant potential in the medical imaging field.
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Affiliation(s)
- Fenglei Fan
- Department of Biomedical Engineering, Rensselaer Polytechnic Institute, Troy, NY, USA
| | - Hongming Shan
- Department of Biomedical Engineering, Rensselaer Polytechnic Institute, Troy, NY, USA
| | - Mannudeep K. Kalra
- Department of Radiology, Massachusetts General Hospital, Boston, MA 02114, USA
| | - Ramandeep Singh
- Department of Radiology, Massachusetts General Hospital, Boston, MA 02114, USA
| | - Guhan Qian
- Department of Biomedical Engineering, Rensselaer Polytechnic Institute, Troy, NY, USA
| | - Matthew Getzin
- Department of Biomedical Engineering, Rensselaer Polytechnic Institute, Troy, NY, USA
| | - Yueyang Teng
- Sino-Dutch Biomedical and Information Engineering School, Northeastern University, Shenyang, China, 110169
| | - Juergen Hahn
- Department of Biomedical Engineering, Rensselaer Polytechnic Institute, Troy, NY, USA
| | - Ge Wang
- Department of Biomedical Engineering, Rensselaer Polytechnic Institute, Troy, NY, USA
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10
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De Man Q, Haneda E, Claus B, Fitzgerald P, De Man B, Qian G, Shan H, Min J, Sabuncu M, Wang G. A two-dimensional feasibility study of deep learning-based feature detection and characterization directly from CT sinograms. Med Phys 2020; 46:e790-e800. [PMID: 31811791 DOI: 10.1002/mp.13640] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [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] [Received: 10/23/2018] [Revised: 05/27/2019] [Accepted: 05/27/2019] [Indexed: 11/07/2022] Open
Abstract
Machine Learning, especially deep learning, has been used in typical x-ray computed tomography (CT) applications, including image reconstruction, image enhancement, image domain feature detection and image domain feature characterization. To our knowledge, this is the first study on machine learning for feature detection and analysis directly based on CT projection data. Specifically, we present neural network methods for blood vessel detection and characterization in the sinogram domain avoiding any partial volume, beam hardening, or motion artifacts introduced during reconstruction. First, we estimate sinogram domain vessel maps using a residual encoder-decoder convolutional neural network (REDCNN). Next, we estimate the vessel centerline and we extract the vessel-only sinogram from the original sinogram, eliminating any background information. Finally, we use a fully connected neural network to estimate the vessel lumen cross-sectional area from the vessel-only sinogram. We trained and tested the proposed methods using CatSim simulations, real CT measurements of vessel phantoms, and clinical data from the NIH CT image database. We achieved encouraging initial results showing the feasibility of CT analysis in the sinogram domain. In principle, sinogram domain analysis should be possible for many other and more complicated clinical CT analysis tasks. Further studies are needed for this sinogram domain analysis approach to become practical for clinical applications.
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Affiliation(s)
| | | | | | | | | | - Guhan Qian
- Rensselaer Polytechnic Institute, Troy, NY, 12180, USA
| | - Hongming Shan
- Rensselaer Polytechnic Institute, Troy, NY, 12180, USA
| | - James Min
- Weill Cornell Medical Center, New York, NY, 10065, USA
| | | | - Ge Wang
- Rensselaer Polytechnic Institute, Troy, NY, 12180, USA
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11
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Qian G, Xu X, Chen L, Xia S, Wang A, Chuai Y, Jiang W. The effect of maternal low flow oxygen administration during the second stage of labour on umbilical cord artery pH: a randomised controlled trial. BJOG 2018; 124:678-685. [PMID: 28224745 DOI: 10.1111/1471-0528.14418] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/28/2016] [Indexed: 11/29/2022]
Abstract
OBJECTIVE To assess the effect of maternal low flow oxygen administration during the second stage of labour on umbilical cord artery pH. DESIGN A randomised controlled trial. SETTING A tertiary teaching hospital in China. POPULATION Women in the second stage of labour with no complications. METHODS About 443 women were randomly allocated to receive either supplemental oxygen at a flow rate of 2 l/min or a sham supplementation by nasal cannula. Healthcare providers, women and outcome assessors were blinded to allocation. MAIN OUTCOME MEASURES Umbilical cord artery pH and fetal heart rate (FHR) pattern. RESULTS Baseline characteristics were similar between the two groups. There were no significant differences between the two groups in the umbilical cord artery pH [median 7.261, interquartile range (IQR) 7.228-7.295 versus 7.266 (IQR 7.232-7.297), P = 0.64], the proportion with pH less than 7.2 [30/219 versus 34/224, P = 0.66, RR (relative risk) 0.9, 95% CI 0.57-1.42], and the proportion with normal FHR pattern (147/219 versus 153/224, P = 0.79, RR 0.98, 95% CI 0.86-1.12). Maternal partial pressure of dissolved oxygen was significantly higher in the oxygen group than in the sham group [median 150.0 mmHg (IQR 142.6-156.7) versus 112.0 (IQR 104.8-118.3), P < 0.001], whereas carbon dioxide was significantly lower in the oxygen group than in the sham group (mean difference -1.1, 95% CI -2.1 to -0.1, P = 0.03). CONCLUSION The use of 2 l/min maternal oxygen during the second stage of labour did not adversely affect either the umbilical artery pH or the FHR pattern distribution. TWEETABLE ABSTRACT No difference in abnormal fetal acid base or normal heart rate if maternal O2 given, randomised trial finds.
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Affiliation(s)
- G Qian
- Department of Obstetrics and Gynaecology, Navy General Hospital, Beijing, China
| | - X Xu
- Department of Anaesthesia, Navy General Hospital, Beijing, China.,Department of Anaesthesia, Chaoyang Chinese Traditional and Western Medicine Emergency Medical Center, Beijing, China
| | - L Chen
- Department of Obstetrics and Gynaecology, Navy General Hospital, Beijing, China
| | - S Xia
- Department of Obstetrics and Gynaecology, Navy General Hospital, Beijing, China
| | - A Wang
- Department of Obstetrics and Gynaecology, Navy General Hospital, Beijing, China
| | - Y Chuai
- Department of Obstetrics and Gynaecology, Navy General Hospital, Beijing, China
| | - W Jiang
- Department of Obstetrics and Gynaecology, Navy General Hospital, Beijing, China
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Wang K, Shen F, Liu J, Yan Z, Li J, Xia Y, Shi L, Qian G, Lu Z, Chen Y, Wan X, Wu M, Zhang Y. Antiviral therapy improves outcomes after radiofrequency ablation for HBV-related hepatocellular carcinoma: A propensity score matching analysis. Ann Oncol 2018. [DOI: 10.1093/annonc/mdy282.092] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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13
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Niffenegger M, Qian G, Gonzalez-Albuixech V, Sharabi M, Lafferty N. Analysis of a reactor pressure vessel subjected to pressurized thermal shocks. Int J CMEM 2016. [DOI: 10.2495/cmem-v4-n3-288-300] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
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14
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Lv F, Qian G, You W, Lin H, Wang XF, Qiu GS, Jiang YS, Pang LX, Kang YM, Jia BF, Xu JZ, Yu Y. Variants in mitochondrial tRNA gene may not be associated with thyroid carcinoma. Balkan J Med Genet 2016; 18:59-64. [PMID: 27785398 PMCID: PMC5026273 DOI: 10.1515/bjmg-2015-0090] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
Thyroid cancer is a very common form of endocrine system malignancy. To date, the molecular mechanism underlying thyroid cancer remains poorly understood. Studies of oncocytic tumors have led to a hypothesis which proposes that defects in oxidative phosphorylation (OX- PHOS) may result in a compensatory increase in mitochondrial replication and gene expression. As a result, mitochondrial DNA (mtDNA) mutation analysis has become a useful tool to explore the molecular basis of this disease. Among these mutations, mitochondrial transfer RNAs (mttRNAs) are the hot spots for pathogenic mutations associated with thyroid cancer. However, due to its high mutation rate, the role of mt-tRNA variants in thyroid cancer is still controversial. To address this problem, in this study, we reassessed seven reported mt-tRNA variants: tRNAAsp G7521A, tRNAArg T10411C and T10463C, tRNALeu(CUN) A12308G, tRNAIle G4292C and C4312T, and tRNAAla T5655C, in clinical manifestations of thyroid cancer. We first performed the phylogenetic conservation analysis for these variants; moreover, we used a bioinformatic tool to compare the minimum free energy (G) of mt-tRNA with and without mutations. Most strikingly, none of these variants caused the significant change of the G between the wild-type and the mutant form, suggesting that they may not play an important roles in thyroid cancer. In addition, we screened the frequency of the “pathogenic” A12308G alternation in 300 patients with thyroid cancer and 200 healthy controls. We found that there were five patients and three control subjects carrying this variant. It seemed that the A12308G variant may be a common polymorphism in the human population. Taken together, our study indicated that variants in mt-tRNA genes may not play active roles in patients with thyroid cancer.
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Affiliation(s)
- F Lv
- Department of Breast Surgery, Henan Provincial People’s Hospital, Zhengzhou, People’s Republic of China
| | - G Qian
- Department of Endocrinology, Ningbo Fourth Hospital, Xiangshan, People’s Republic of China
| | - W You
- Department of Breast Surgery, Henan Provincial People’s Hospital, Zhengzhou, People’s Republic of China
| | - H Lin
- College of Laboratory Medicine and Life Sciences, Wenzhou Medical University, Wenzhou, People’s Republic of China
| | - XF Wang
- College of Laboratory Medicine and Life Sciences, Wenzhou Medical University, Wenzhou, People’s Republic of China
| | - GS Qiu
- Department of Endocrinology, Ningbo Fourth Hospital, Xiangshan, People’s Republic of China
| | - YS Jiang
- Department of Endocrinology, Ningbo Fourth Hospital, Xiangshan, People’s Republic of China
| | - LX Pang
- College of Laboratory Medicine and Life Sciences, Wenzhou Medical University, Wenzhou, People’s Republic of China
| | - YM Kang
- School of Basic Medical Sciences, Inner Mongolia Medical University, Hohhot, People’s Republic of China
| | - BF Jia
- School of Basic Medical Sciences, Inner Mongolia Medical University, Hohhot, People’s Republic of China
| | - JZ Xu
- Department of Clinical Pharmacy, the Affiliated Wenling Hospital of Wenzhou Medial University, Wenling, People’s Republic of China
| | - Y Yu
- Department of Breast Surgery, Henan Provincial People’s Hospital, Zhengzhou, People’s Republic of China
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15
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Yu Y, Lv F, Lin H, Qian G, Jiang YS, Pang LX, Wang YP, Wang XF, Kang YM, Li CB, Liu Q, Xu JZ, You W. Mitochondrial ND3 G10398A mutation: a biomarker for breast cancer. Genet Mol Res 2015; 14:17426-31. [PMID: 26782384 DOI: 10.4238/2015.december.21.12] [Citation(s) in RCA: 15] [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] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Mitochondrial DNA mutations have been found to play important roles in carcinogenesis. The most common G10398A mutation, a non-conservative amino acid substitution from Thr to Ala, seems to be involved in the tumorigenesis of breast cancer. Results from studies concerning this mutation remain inconclusive. In the current study, we first took clinical and molecular datasets from case-control studies to determine the association between the G10398A mutation and breast cancer. We further used the Phylotree to determine the haplogroups of this mutation. The frequencies of this mutation in 500 unrelated healthy controls were also screened. We found that this mutation is very common in the human population, and may be a polymorph.
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Affiliation(s)
- Y Yu
- Department of Breast Surgery, Henan Provincial People's Hospital, Zhengzhou, China
| | - F Lv
- Department of Breast Surgery, Henan Provincial People's Hospital, Zhengzhou, China
| | - H Lin
- College of Laboratory Medicine and Life Sciences, Wenzhou Medical University, Wenzhou, China
| | - G Qian
- Department of Endocrinology, Ningbo Fourth Hospital, Xiangshan, China
| | - Y S Jiang
- Department of Endocrinology, Ningbo Fourth Hospital, Xiangshan, China
| | - L X Pang
- College of Laboratory Medicine and Life Sciences, Wenzhou Medical University, Wenzhou, China
| | - Y P Wang
- College of Laboratory Medicine and Life Sciences, Wenzhou Medical University, Wenzhou, China
| | - X F Wang
- College of Laboratory Medicine and Life Sciences, Wenzhou Medical University, Wenzhou, China
| | - Y M Kang
- School of Basic Medical Sciences, Inner Mongolia Medical University, Hohhot, China
| | - C B Li
- School of Basic Medical Sciences, Inner Mongolia Medical University, Hohhot, China
| | - Q Liu
- Department of Clinical Laboratory Center, Shaoxing People's Hospital, Shaoxing Hospital of Zhejiang University, Shaoxing, China
| | - J Z Xu
- Department of Clinical Pharmacy, The Affiliated Wenling Hospital of Wenzhou Medial University, Wenling, China
| | - W You
- Department of Breast Surgery, Henan Provincial People's Hospital, Zhengzhou, China
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16
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González-Albuixech V, Qian G, Niffenegger M. Integrity analysis of reactor pressure vessels subjected to pressurized thermal shocks by XFEM. Nuclear Engineering and Design 2014. [DOI: 10.1016/j.nucengdes.2014.04.038] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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17
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Qian G, Ran X, Zhou CX, Deng DQ, Zhang PL, Guo Y, Luo JH, Zhou XH, Xie H, Cai M. Systemic lupus erythematosus patients in the low-latitude plateau of China: altitudinal influences. Lupus 2014; 23:1537-45. [PMID: 25059490 DOI: 10.1177/0961203314544186] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
The current study was to investigate the features of hospitalized patients with systemic lupus erythematosus (SLE) at different altitudes. The correlation between SLE activity and altitudinal variations was also explored. Medical records of 1029 patients were retrospectively reviewed. Activity of SLE in each organ system was recorded using the Systemic Lupus Erythematosus Disease Activity Index (SLEDAI). There was no significant correlation between SLE activity and altitudes (r = 0.003, p = 0.159). Age at onset for SLE patients at high altitudes was significantly younger than that at low and moderate altitudes (p = 0.022 and p = 0.004, respectively). Age at SLE admission at low altitudes was significant older than those at moderate and high altitudes (p = 0.011 and p < 0.001, respectively). Patients at high altitudes had shorter duration from disease onset to admission than those at moderate altitudes (p = 0.009). Incidence of Sm antibodies-positive for resident patients at high altitudes was 36.4%, which were higher than that at moderate altitudes (p = 0.003). We found increasing trends of CNS activity in active patients; immunological and renal activities in inactive patients were correlated with elevated altitudes (p = 0.024, p = 0.004, p = 0.005), while arthritis scores in active patients showed the tendency of decreasing with the rise of elevation (p = 0.002). Hemoglobin level, red blood cell and platelet counts at high altitudes were significantly lower than those at low altitudes (p < 0.05, respectively). There was no significant difference in hemoglobin level between moderate- and low-altitude groups (p > 0.05). No significant difference in platelet counts between moderate- and high-altitude groups was observed (p > 0.05). Our findings suggest that some clinical features, laboratory tests and activity of main organs in SLE are influenced by altitudes. Furthermore, organ activities of active and inactive SLE patients have different patterns of altitudinal variations. These distinctive variations likely reveal that peculiar environmental factors at high altitudes can affect the development of SLE.
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Affiliation(s)
- G Qian
- Department of Dermatology & Rheumatology, The Second Affiliated Hospital of Kunming Medical University, Kunming, China
| | - X Ran
- Department of Dermatology & Rheumatology, The Second Affiliated Hospital of Kunming Medical University, Kunming, China
| | - C X Zhou
- Department of Dermatology & Rheumatology, The Second Affiliated Hospital of Kunming Medical University, Kunming, China
| | - D Q Deng
- Department of Dermatology & Rheumatology, The Second Affiliated Hospital of Kunming Medical University, Kunming, China
| | - P L Zhang
- Department of Dermatology & Rheumatology, The Second Affiliated Hospital of Kunming Medical University, Kunming, China
| | - Y Guo
- Department of Dermatology & Rheumatology, The Second Affiliated Hospital of Kunming Medical University, Kunming, China
| | - J H Luo
- Department of Epidemiology, School of Public Health, Kunming Medical University, Kunming, China
| | - X H Zhou
- Department of Dermatology & Rheumatology, The Second Affiliated Hospital of Kunming Medical University, Kunming, China
| | - H Xie
- Department of Dermatology & Rheumatology, The Second Affiliated Hospital of Kunming Medical University, Kunming, China
| | - M Cai
- Department of Dermatology & Rheumatology, The Second Affiliated Hospital of Kunming Medical University, Kunming, China
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Zhang Q, Qian G, Ding Z. Xuemaitong granules attenuate carotid atherosclerosis by decreasing the expression of CD14+CD16+ monocytes, IL-6, TNF-α, and hsCRP. Genet Mol Res 2014; 13:7519-27. [DOI: 10.4238/2014.september.12.19] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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19
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Shuaib FMB, Jolly PE, Ehiri JE, Ellis WO, Yatich NJ, Funkhouser E, Person SD, Williams JH, Qian G, Wang JS. Socio-demographic determinants of aflatoxin B1-lysine adduct levels among pregnant women in Kumasi, Ghana. Ghana Med J 2012; 46:179-88. [PMID: 23661836 PMCID: PMC3645171] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/02/2023] Open
Abstract
OBJECTIVES Aflatoxins are fungal metabolites that contaminate staple food crops in many developing countries. Although studies have linked these toxins to adverse birth outcomes and poor infant development, no study has investigated the socio-demographic and economic determinants of aflatoxin levels among pregnant women living in sub-Saharan Africa. DESIGN A cross-sectional study was conducted among 785 pregnant women in Kumasi. Aflatoxin B1 lysine adduct levels (AF-ALB) were determined by High Performance Liquid Chromatography. Analysis of variance was used to determine mean log AF-ALB levels and significance of differences in these levels according to socio-demographic variables. Logistic regression was used to identify independent associations of socio-demographics with having AF-ALB levels (≥ 11.34 pg/mg; upper quartile). RESULTS AF-ALB levels ranged from 0.44 pg/mg to 268.73 pg/mg albumin with a median level of 5.0 pg/mg. Bivariate analyses indicates that mean ln AF-ALB as well as the percent of women having high AF-ALB levels (≥ 11.34 pg/mg; upper quartile) were inversely associated with indices of higher socioeconomic status: higher education and income, being employed and having a flush toilet. Higher income, being employed, having one child (verses no children) and having a flush toilet (verses no toilet facilities) were each independently associated with a 30-40% reduced odds of high AF-ALB levels. CONCLUSIONS Additional research is needed to investigate how socio-demographic and economic factors interact to influence aflatoxin ingestion by individuals in regions with high aflatoxin crop contamination. This knowledge can be used to formulate and implement policies that will reduce exposure of women and their unborn children to these toxins.
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Affiliation(s)
- F M B Shuaib
- Department of Epidemiology, Ryals School of Public Health, University of Alabama at Birmingham, 1665 University Boulevard, Birmingham, AL 35294-0022, USA.
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Yüce B, Kemmer M, Qian G, Müller M, Sibaev A, Li Y, Kreis ME, Storr M. Cannabinoid 1 receptors modulate intestinal sensory and motor function in rat. Neurogastroenterol Motil 2010; 22:672-e205. [PMID: 20158615 DOI: 10.1111/j.1365-2982.2010.01473.x] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [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] [Indexed: 02/08/2023]
Abstract
BACKGROUND Cannabinoid receptors are involved in visceral pain perception and control of intestinal motility in vivo. The underlying mechanisms are not well characterized. We aimed to determine whether the cannabinoid-1 (CB(1)) receptor modulates intestinal afferent nerve discharge and the peristaltic reflex. METHODS Rats were anesthetized and intestinal segments were removed. Afferent nerve discharge from a mesenteric nerve was investigated in vitro in the presence of the CB(1) antagonist SR 141716A or the CB(1) agonist WIN 55212-2. The myenteric peristaltic reflex was induced by electrical field stimulation and influence of SR 141716A or WIN 55212-2 was recorded. KEY RESULTS Afferent nerve discharge to the algesic mediator bradykinin was reduced to 11 +/- 5.1 imp s(-1) following pretreatment with SR 141716A and unchanged after WIN 55212-2 compared to 63 +/- 15.4 imp s(-1) in controls. At maximum distension pressure (80 cmH(2)O) during ramp distension, 92 +/- 12.4 imp s(-1) were reached following SR 141716A compared to 260 +/- 13.2 in vehicle controls and 227 +/- 15.4 in WIN 55212-2 pretreated animals. In contrast, afferent discharge to 5-HT (500 micromol L(-1)) was increased to 75 +/- 24.6 imp s(-1) following WIN 55212-2 compared to 18 +/- 5.9 imp s(-1) in controls, whereas SR 141716A had no effect. Ascending neuronal contractions were dose-dependently attenuated in the presence of SR 141716A and latency of these contractions was reduced. WIN 55212-2 had opposite effects that were abolished by SR 141716A. CONCLUSIONS & INFERENCES Activation of the CB(1) receptor differentially alters afferent intestinal nerve sensitivity to bradykinin, 5-HT, and noxious mechanical distension, while it strengthens ascending neuronal contractions. Further studies are needed to determine the physiological relevance of these observations.
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Affiliation(s)
- B Yüce
- Department of Internal Medicine II, Ludwig Maximilians University, 81377 Munich, Germany.
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21
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Wang Y, Qian G, Wang G, Cheng X, Bai C, Wang X. Potential therapy of Fc-antigen combination-encoding DNA vaccination in mouse allergic airway inflammation. Clin Exp Immunol 2008; 154:115-22. [PMID: 18727625 DOI: 10.1111/j.1365-2249.2008.03736.x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
Abstract
Vaccination with allergen-encoding DNA has been proposed as having potential for allergen-specific immunotherapy. In this study, we examine the therapeutic effect of allergen-encoding DNA vaccination directly to dendritic cells (DCs) on allergen-induced allergic airway inflammation in a mouse model and explore potential mechanism. Ovalbumin (OVA)-sensitized and challenged mice were immunized with DNA vaccine and received bronchoalveolar lavage (BAL) 1 day after the last challenge, to measure BAL levels of interleukin (IL)-4, IL-5, interferon (IFN)-gamma and differential cell count. Pulmonary DCs and Spleen DCs were purified and sorted according to the expression of CD(11c) (+)CD(80) (+) and CD(11c) (+)CD(86) (+) co-stimulatory molecules. Our data demonstrated that DNA vaccine therapy with OVA-Fc-pcDNA(3.1) significantly prevented OVA-increased levels of IL-4, IL-5 and the percentage of eosinophils and OVA-decreased level of IFN-gamma. OVA-Fc-pcDNA(3.1)-treated mice had less severity of airway inflammation, and lower expression of CD(11c) (+)CD(80) (+) and CD(11c) (+)CD(86) (+) on pulmonary DCs, as compared with animals with OVA-pcDNA(3.1,) pcDNA(3.1) and OVA respectively. DNA vaccine encoding both Fc and OVA was shown to be more effective than DNA vaccine encoding OVA alone. Our data indicate that Fc-antigen combination-encoding DNA vaccination has better preventive effects on antigen-induced airway inflammation by regulating DCs, and may be a new alternative therapy for asthma.
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Affiliation(s)
- Y Wang
- Department of Pulmonary Medicine, Zhongshan Hospital, Fudan University, Shanghai, China
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Han ZX, Qian G, Wu F, Pan ZF, Deng GB, Yu MQ. Sequences variation and classification of B-hordein genes in hull-less barley from the Qinghai-Tibet Plateau. Mol Biol 2008. [DOI: 10.1134/s0026893308010081] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Han ZX, Qian G, Wu F, Pan ZF, Deng GB, Yu MQ. [Sequences variation and classification of B-hordein genes in hull-less barley from Qinghai-Tibet Plateau]. Mol Biol (Mosk) 2008; 42:63-70. [PMID: 18389621] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
The goal of this study is to understand the evolution relationship of the members of B-hordein gene family in hull-less barley by analysis of their structure and to explore their utility in grain quality improvement. Six copies of B-hordein gene (Hn1-Hn3, Hn7-Hn9) were cloned from six hull-less barley cultivars collected from Qinghai-Tibet Plateau and molecularly characterized. Comparison of their predicted polypeptide sequences with the published suggested that they all share the same basic protein structures. In addition, we found that the C-terminal end sequences of all B-hordeins shared a similar feature. In the six clones and the other three published (Hn4, Hn5 and Hn6) from hull-less barley, Hn2 and Hn7 contained identical C-terminal end sequence DIMPVDFWH, Hn3, Hn4, Hn5, Hn8 and Hn9 also shared the common sequence DIMPPDFWH, which was similar to that of a B-hordein reported previously. Both Hnl and Hn6 exhibited differences in their C-terminal end sequences, and they clustered into different subgroups. The B-hordeins with identical C-terminal end sequences were clustered into a same subgroup, so we believe that B-hordein gene subfamilies possibly can be classified on the basis of the conserved C-terminal end sequences of predicted polypeptide. Phylogenetic analysis also indicated that there is a relatively weak identity between our predicted B-hordeins and those reported from H. chilense and H. brevisubulatum. All of our nine predicted B-hordeins were clustered together and other B-hordeins formed another cluster. The possible use of these genes in relation to the barley quality is discussed.
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Abstract
The Notch proteins constitute a family of transmembrane receptors that play a pivotal role in cellular differentiation, proliferation, and apoptosis. RNA interference of Presenilin1 (PS1) and Notch1 was carried out in this research to determine whether it could block Notch signaling and induce growth inhibition in HeLa cells. We transfected synthesized target small interfering RNA (siRNA) into HeLa cells, and blocking of Notch signaling was detected by C-promoter binding factor-1 (CBF1) reporter. We then conducted cell proliferation assay. Cells transfected with PS1 and Notch1 siRNA showed great inhibition in proliferation compared to the controls in vitro and in vivo. We conclude that RNA interference of PS1 or Notch1 can block Notch signaling and consequently induce growth inhibition of HeLa cells.
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Affiliation(s)
- H Yu
- Research Center for Human Gene Therapy, Department of Biochemistry and Molecular Biology, School of Medicine, Shanghai Jiao Tong University, Shanghai, China
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Cangiane L, Lederman G, Qian G, Fastaia M, Gilson B. 2173. Int J Radiat Oncol Biol Phys 2006. [DOI: 10.1016/j.ijrobp.2006.07.578] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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27
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Fastaia M, Lederman G, Israeli R, Qian G, Gilson B, Volpicella F. 2279. Int J Radiat Oncol Biol Phys 2006. [DOI: 10.1016/j.ijrobp.2006.07.686] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Lederman G, Qian G, Fastaia M, Gilson B, Cangiane L. 2641. Int J Radiat Oncol Biol Phys 2006. [DOI: 10.1016/j.ijrobp.2006.07.1055] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Abstract
OBJECTIVE AND DESIGN The aim of this study was to investigate whether P12, a lipopolysaccharide (LPS)-binding protein (LBP) inhibitory peptide could reduce LPS induced inflammation in vitro and in vivo. MATERIAL AND METHODS Human monocyte-like cell line (U937 cells) was grown in RPMI 1640 and stimulated with PMA in order to induce differentiation to the macrophage stage. A total of 70 Kunming mice (8-12 wk old) were used in our experiments. The effects of P12 on the binding of LPS to U937 cells and alveolar macrophages (AMs) were determined by flow cytometric analysis. Nuclear factor kappa B (NF-kappa B) translocation was evaluated with subunit P65 by Western blotting. The production of tumor necrosis factor-alpha (TNF-alpha), alanine transaminase (ALT), and nitric oxide (NO) as measured by ELISA, enzymatic activity assay, and enzymatic assay with nitrate reductase. Differences among groups were determined using one-way ANOVA test and Fisher exact test. TREATMENT U937 cells were treated with LPS, LBP, and indicated concentrations of P12. Mice were administered LPS intraperitoneally and P12 via the tail vein. RESULTS P12 inhibited the binding of FITC-conjugated LPS (FITC-LPS) to U937 cells and AMs. NF-kappa B translocation and the production of TNF-alpha, ALT, and NO induced by LPS was also significantly suppressed by P12. Furthermore P12 protected mice from LPS-induced death. CONCLUSIONS The results suggest that blockade of LBP at inflammation sites might attenuate LPS-induced circulatory shock. This results in a beneficial effect in a mouse model of endotoxemia.
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Affiliation(s)
- X Wu
- Institute of Respiratory Disease, Xinqiao Hospital, Third Military Medical University, Chongqing, 400037, China
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Qian G, Lowry J, Silverman P, Grosman I, Makara D, Lederman G. Stereotactic extra-cranial radiosurgery for renal cell carcinoma. Int J Radiat Oncol Biol Phys 2003. [DOI: 10.1016/s0360-3016(03)01136-2] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Abstract
The utility of using inertial data for the structure-from-motion (SfM) problem is addressed. We show how inertial data can be used for improved noise resistance, reduction of inherent ambiguities, and handling of mixed-domain sequences. We also show that the number of feature points needed for accurate and robust SfM estimation can be significantly reduced when inertial data are employed. Cramér-Rao lower bounds are computed to quantify the improvements in estimating motion parameters. A robust extended-Kalman-filter-based SfM algorithm using inertial data is then developed to fully exploit the inertial information. This algorithm has been tested by using synthetic and real image sequences, and the results show the efficacy of using inertial data for the SfM problem.
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Affiliation(s)
- G Qian
- Department of Electrical and Computer Engineering, Center for Automation Research, University of Maryland, College Park, Maryland 20742-3275, USA
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Li J, Xu X, Han B, Huang G, Qian G, Liang P, Yang T. [Construction of a subtracted cDNA library of differentially expressed genes in human normal liver tissue and primary hepatocellular carcinoma tissue]. ZHONGHUA GAN ZANG BING ZA ZHI = ZHONGHUA GANZANGBING ZAZHI = CHINESE JOURNAL OF HEPATOLOGY 2001; 9:346-8. [PMID: 11782302] [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] [Subscribe] [Scholar Register] [Indexed: 02/23/2023]
Abstract
OBJECTIVE To construct a subtracted cDNA library of differentially expressed genes in human normal liver tissue and primary hepatocellular carcinoma (HCC) tissue. METHODS Using the suppression subtractive hybridization (SSH), a novel technique has been described recently. cDNA fragments of missing or low expressing tumor suppressor genes in HCC tissue were isolated using paracancerous normal liver tissue and HCC tissue as targets. Then these cDNA fragments were directly inserted into T/A cloning vector to set up the subtractive library. Amplification of the library was carried out with transformation of E.coli by high voltage electroperforation. One hundred positive bacteria clones were randomly picked and identified using enzyme restriction method. RESULTS The amplified library contained more than 4,000 positive bacteria clones. Random analysis of 100 clones with enzyme restriction method showed that all clones contained 200-600 bp inserts. CONCLUSIONS A subtracted cDNA library of differentially expressed genes in human normal liver tissue and HCC tissue is constructed successfully with SSH and T/A cloning techniques. The library is efficient and lays solid foundation for screening and cloning new and specific missing or low expressing tumor suppressor genes of HCC.
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Affiliation(s)
- J Li
- Department of Hepatobiliary Surgery, Xinqiao Hospital, Third Military Medical University, Chongqing 400037, China
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Xu X, Qian G, Zhu Y. [Changes of L-selectin expression on polymorphonuclear leukocytes and its role during polymorphonuclear leukocytes sequestration in lungs of rats with acute lung injury]. Zhonghua Jie He He Hu Xi Za Zhi 2001; 24:732-5. [PMID: 11930702] [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] [Subscribe] [Scholar Register] [Indexed: 02/24/2023]
Abstract
OBJECTIVE To explore the changes of L-selectin protein expression on peripheral blood polymorphonuclear leukocytes (PMN) and their role during PMN sequestration in the lungs of rats with acute lung injury (ALI). METHODS The model of ALI in rat was established by intravenous injection of E. Coli endotoxin (ET). The protein expression of L-selectin on peripheral blood PMNs was measured by immunofluorescence and flow cytometry. Myeloperoxidase (MPO) enzyme analysis and histology were employed to estimate the quantity of PMN sequestration in lungs of rats during ALI. RESULTS (1) The protein expression of L-selectin on PMN after injection of ET (7.8 +/- 1.6) was all significantly lower than that in control group (10.5 +/- 2.1, P < 0.05). (2) MPO activity increased significantly after injection of ET in comparison with the control group [0.069 +/- 0.011) U/mg lung tissue, P < 0.01]. The difference was not significant between the fucodin treated 5 min group [(0.391 +/- 0.071) U/mg lung tissue] and ET-treated 5 min group [(0.359 +/- 0.074) U/mg lung tissue]. But MPO activity was significantly lower in fucodin-treated 15 min group [(0.396 +/- 0.061) U/mg lung tissue] than that in ET-treated group at same time point [(0.490 +/- 0.069) U/mg lung tissue, P < 0.05]. CONCLUSIONS (1) In physiological state, L-selectin are consistently expressed on the surface of PMN membrane. The protein expression of L-selectin on PMNs reduces rapidly after injection of ET and is the lowest at 15 min, then gradually increases. (2) The early stage of PMN sequestration in lungs is not dependent on L-selectin, but L-selectin is still important for maintaining a continual PMN sequestration in lungs of rats with ALI.
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Affiliation(s)
- X Xu
- Department of Respiratory Disease, Xinqiao Hospital, Chongqing 400037, China
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34
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Huang G, Qian G, Cheng D. [The effect of monocarboxylate transporter gene on the regulation of pHi and growth character in cancer cells]. Zhonghua Jie He He Hu Xi Za Zhi 2001; 24:666-70. [PMID: 16136905] [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] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
OBJECTIVE To study the influence of the first subtype of monocarboxylate transporter (MCT1) gene on pHi regulation, lactate transport and cell growth in tumor cells. METHODS (1) With RT-PCR technique, MCT1 cDNA fragment was cloned from human lung cancer cells A549, and the cloned fragment MCT1 was reversely inserted into the vector pLXSN to acquire antisense expression recombinant vector pLXSN-MCT1. (2) pLXSN, pLXSN-MCT1 were respectively introduced into the A549 cells by electroporation. The transfected A549 cell resistant to G418 drug was selected as positive clones and proved by PCR. The changes of intracellular pH and lactate in the transfected A549 cells were detected by spectrophotometric method. Cell growth was studied by cell growth curve. RESULTS (1) The cloned fragment was in the length of 640 bp and successfully bound to pLXSN. It was also proved to be the objective one by DNA sequencing. (2) Intracellular pH and lactate were remarkably decreased in the cells transfected pLXSN-MCT1, comparing to A549 cells without transfection (P < 0.001). The growth of A549 cells transfected pLXSN-MCT1 was also inhibited remarkably. CONCLUSION MCT1 gene could play an important role in pHi regulation, lactate transport and cell growth in tumor cells.
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Affiliation(s)
- G Huang
- Institute of Respiratory Disease, Xinqiao Hospital, Third Military Medical University, Chongqing 400037, China
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Xiong W, Qian G, Huang G. [Recent advances of molecular abnormalities in lung cancer]. Zhonghua Jie He He Hu Xi Za Zhi 2001; 24:690-2. [PMID: 16136911] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
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36
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Sun DD, Tay JH, Cheong HK, Leung DL, Qian G. Recovery of heavy metals and stabilization of spent hydrotreating catalyst using a glass-ceramic matrix. J Hazard Mater 2001; 87:213-223. [PMID: 11566411 DOI: 10.1016/s0304-3894(01)00279-5] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Chemical analysis of spent Co/Mo/gamma Al(2)O(3) catalyst revealed the presence of carbon, molybdenum, sulfur, vanadium and cobalt at levels of 16.0, 10.9, 7.3, 4.6 and 4.0 wt.%, respectively. It was found that calcination at 500 degrees C provides an effective solution for the removal of carbon and sulfur and this generates the oxide form of the heavy metals. The removal of these heavy metals can be achieved through a two-stage leaching process. During the first stage, in which concentrated ammonia is used and it has been found that this process can be successful in removing as much as 83% (w/v) Mo. In a second stage, it was found that using 10% (v/v) of sulfuric acid, it was possible to account for up to 77% (w/v) Co and 4% (w/v) Mo removal. Leaching test results indicated that the vanadium present in the heated spent catalyst was almost stabilized but the molybdenum and cobalt were not. The combination of two solid wastes, ladle furnace slag (LFS) and treated residue of spent catalyst, could be used for making a high value-added anorthite glass-ceramic materials. Further leaching tests showed that ceramic glass materials provided a very effective method of Co, Mo and V heavy metals stabilization resulting in a product with a possible commercial value.
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Affiliation(s)
- D D Sun
- Environmental Engineering Research Centre, School of Civil and Structural Engineering, Nanyang Technological University, Nanyang Avenue, 639798, Singapore, Singapore.
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Unger JB, Yan L, Chen X, Jiang X, Azen S, Qian G, Tan S, Jie G, Sun P, ChunHong L, Chou CP, Zheng H, Anderson Johnson C. Adolescent smoking in Wuhan, China: baseline data from the Wuhan Smoking Prevention Trial. Am J Prev Med 2001; 21:162-9. [PMID: 11567835 DOI: 10.1016/s0749-3797(01)00346-4] [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] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
BACKGROUND This study reports the prevalence of adolescent smoking in the urban and rural areas of Wuhan, China, the capital of Hubei Province, on the Yangtze River in central China. METHODS Smoking behavior was examined by age, gender, and urbanicity as part of the Wuhan Smoking Prevention Trial. Subjects included 6994 seventh- to ninth-grade students attending 22 randomly selected schools in urban and rural districts. Outcome measures included lifetime smoking, past-30-day smoking, established smoking (>100 cigarettes in lifetime), and susceptibility to smoking (absence of a firm commitment not to smoke). RESULTS Lifetime smoking prevalence was 47% among boys and 18% among girls. Past-30-day smoking prevalence was 16% among boys and 4% among girls. Established smoking prevalence was 2% among boys and 0% among girls. The prevalence of susceptibility to smoking was 31% among boys and 10% among girls. Smoking increased significantly with age (p<.0005). Susceptibility was more prevalent in rural areas than in urban areas (p<.05), but there were no urban-rural differences in lifetime, past 30-day smoking, or established smoking. Trend analyses revealed that smoking increased with age more rapidly among boys than among girls (p<.05). Smoking was more prevalent among rural boys than among urban boys, but it was more prevalent among urban girls than among rural girls (p<.05). CONCLUSIONS Adolescent smoking is a significant public health problem in China. Boys are at particularly high risk, as are girls living in urban areas. Effective smoking prevention programs for adolescents, as well as restrictions on tobacco industry marketing and youth access to tobacco, are needed to prevent tobacco-related morbidity and mortality in China.
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Affiliation(s)
- J B Unger
- Department of Preventive Medicine, University of Southern California School of Medicine, Los Angeles, California, USA.
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Li Z, Wang C, Qian G. [The influence of dexamethasone on mRNA expression of interleukin-5, interleukin-3 and granulocyte-macrophage colony-stimulating factor receptors in eosinophils of guinea pig asthma model]. Zhonghua Jie He He Hu Xi Za Zhi 2001; 24:542-7. [PMID: 11758170] [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] [Subscribe] [Scholar Register] [Indexed: 02/23/2023]
Abstract
OBJECTIVE To investigate the iufluence of dexamethasone (DM) on expression of interleukin-5 receptor alpha(IL-5R alpha), interleukin-3 receptor alpha (IL-3R alpha), granulocyte-macrophage-colony-stimulating factor receptor alpha(GM-CSFR alpha) and common beta receptor (beta cR) in bronchalveolar lavage fluid (BALF) eosinophils in guinea pig asthma model, and to study the mechanism of promotion effect of steroid on eosinophil apoptosis. METHODS 18 guinea pigs were divided into three groups randomly, normal control group, asthma group and DM-treated group. Asthma models of guinea pig were sensitized by ovalbumin(OVA). Hypodense EOS (HEOS) and normodense EOS (NEOS) were purified from BALF by gradients of percoll. Apoptosis was detected by method of TdT-mediated dUTP nick end labeling. The mRNA expression of IL-5R alpha, IL-3R alpha, GM-CSFR alpha and common beta receptor (beta cR) in eosinophils were measured by RT-PCR and in situ hybridization. RESULTS Apoptosis of HEOS and NEOS in asthma group(4.0 +/- 2.0 and 3.0 +/- 2.0, respectively) were significanteylower than normal group(8.0 +/- 2.0 and, 7.0 +/- 2.0 respectively, P < 0.01), while the numbers of EOS cells (75.2 +/- 12.6 and 50.7 +/- 11.2, respectively) were significantly higher than normal group (4.8 +/- 1.5 and 9.5 +/- 2.6, respectively, P < 0.01). The BALF HEOS and NEOS of asthma group were remarkably reduced after DM treatment (14.8 +/- 8.0 and 20.0 +/- 7.0, respectively, P < 0.01), Eosinophils apoptosis in DM-treated group (24.0 +/- 5.0 and 22.0 +/- 4.0, respectively) was remarkably higher than those in asthma group (P < 0.01); The expressions of IL-5R alpha, IL-3R alpha, GM-CSFR alpha mRNA of BALF EOS of asthma group were significantly lower, but the expression of beta cR mRNA was significantly higher than those of normal group(P < 0.01, 0.05). The expressions of IL-5R alpha, IL-3R alpha, GM-CSFR alpha mRNA in EOS of DM-treated group were significantly higher, while the expression of beta cR mRNA were significantly lower than those of asthma group (P < 0.01, 0.05). CONCLUSIONS DM promote the apoptosis of BALF EOS of guinea pigs asthma models. and reduce EOS infiltration in lung of guinea pigs asthma models. It also decreased the effect of IL-5, IL-3 and GM-CSF and promoted the apoptosis of lung EOS through inducing the mRNA expression of their specific alpha chain and reducing the mRNA expression of the common beta chain.
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Affiliation(s)
- Z Li
- Institute of Respiratory Diseases, Xinqiao Hospital, Third Military Medical University, Chongqing 400037, China
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Cai S, Zhang J, Qian G. [Impact of quantitative and qualitative pathogen culture on the outcome of ventilator-associated pneumonia]. Zhonghua Jie He He Hu Xi Za Zhi 2001; 24:494-7. [PMID: 11718043] [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] [Subscribe] [Scholar Register] [Indexed: 02/22/2023]
Abstract
OBJECTIVE To evaluate the impact diagnostic methods with either quantitative culture (QC) or qualitative routine culture (RC) on the outcome of VAP. METHODS A prospective, controlled clinical trial in 93 consecutive VAP episodes of 31 patients receiving mechanical ventilation was conducted. VAP episodes were randomly and crossly divided into QC (43 episodes, underwent FOB-PSB-QC) and RC group (50 episodes, underwent ETA-RC). Empirical antibiotic treatment was given according to the attending physician and modified according to the results of culture and sensitivity. The outcomes of VAP were assessed. RESULTS There were no differences with regard to mortality, super-infection rate, antibiotic resistance rate and cost of antibiotics when comparing QC versus RC diagnostic methods and management based on two diagnostic strategies. Inappropriate initial empirical antibiotic treatment led to a higher mortality (17.7%) when compared with those with appropriate treatment. CONCLUSION The present study demonstrates that the outcome of VAP is probably more dependent on the adequacy of the initial antibiotic treatment than on the use of either diagnostic sampling.
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Affiliation(s)
- S Cai
- General Hospital of PLA, Beijing 100853, China
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Qian G. [Make effort to raise the diagnostic and therapeutic levels of lung cancer]. Zhonghua Jie He He Hu Xi Za Zhi 2001; 24:449. [PMID: 11718032] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/22/2023]
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41
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Cai S, Zhang J, Qian G. [Correlation of endotracheal tube biofilm and recurrent ventilator-associated pneumonia with Pseudomonas aeruginosa]. Zhonghua Jie He He Hu Xi Za Zhi 2001; 24:339-41. [PMID: 11802984] [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] [Subscribe] [Scholar Register] [Indexed: 02/23/2023]
Abstract
OBJECTIVE To determine the correlation of endotracheal tube biofilm (ETT-BF) and recurrent ventilator-associated pneumonia with Pseudomonas aeruginosa (PA-VAP) in long-term ventilation patients. METHODS Pulsed-field gel electrophoresis (PFGE) of Spe I enzyme-restricted chromosomal DNA was performed to identify the DNA patterns of Pseudomonas aeruginosa from ETT-BF, pharynx and lower respiratory tract secretion in 15 VAP patients. The chromosomal DNA fingerprint profile of each strain was compared with those from all other strains to calculate the similarity by using the correlation coefficient. The strains were then grouped and groups were depicted as a dendrite using the average clustering algorithm. RESULTS When bacteria has been isolated from ETT-BF, the same DNA pattern species are isolated from the lower respiratory tract secretion in 7 of 15 patients. Recurrent PA-VAP is caused by closely related and indistinguishable isolates in 6 of 15 patients. All PEGE patterns from 9 patients are different from one another (correlation coefficient < 31.2%). CONCLUSIONS The close pathogenic relationship between ETT-BF and lower airway secretion suggests that adhesive colonization of ETTs may be an important factor in the pathogenesis of VAP.
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Affiliation(s)
- S Cai
- General Hospital of PLA, Beijing 100853, China
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Yao W, Zhao B, Zhao Y, Wang W, Qian G. Ultrasonographic texture analysis of parenchymatous organs by the four-neighborhood-pixels algorithm: clinical experiment. J Ultrasound Med 2001; 20:465-471. [PMID: 11345103 DOI: 10.7863/jum.2001.20.5.465] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
OBJECTIVE The parenchyma of organs such as liver, thyroid, and mammary gland during climacterium have common ultrasonographic textural features, which together form what we call small-dot-structure texture. To study this texture we designed the 4-neighborhood-pixels algorithm, an ultrasonographic texture analysis algorithm. The objective of this study was to confirm whether the 4-neighborhood-pixels algorithm can reflect the features of small-dot-structure texture. METHODS A changed small-dot-structure texture and 3 other textures were compared with the normal small-dot-structure texture in 4 groups, and a histogram algorithm was used for contrast with the 4-neighborhood-pixels algorithm. RESULTS The 4-neighborhood-pixels algorithm could reflect all the textural differences, but the histogram algorithm could reflect only some of them. CONCLUSIONS The 4-neighborhood-pixels algorithm is a good algorithm for analyzing ultrasonographic small-dot-structure texture. Not only can it reflect changes in the small-dot-structure texture, but it can also differentiate between small-dot-structure and non-small-dot-structure textures.
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Affiliation(s)
- W Yao
- Ultrasonic Examination Department, Changhai Hospital, Shanghai, People's Republic of China
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Sun G, He X, Qian G, Pu Y. [Detection of aflatoxin-albumin adducts in human serum and its application]. Wei Sheng Yan Jiu 2001; 30:185-8. [PMID: 12525098] [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] [Subscribe] [Scholar Register] [Indexed: 02/28/2023]
Abstract
Exposure to aflatoxin B1 (AFB1) is one of the major risk factors in the etiology of human hepatocellular carcinoma (HCC). The development of highly sensitive and specific methods for detecting AFB1 and its macromolecular biomarkers are critical for identifying individuals at risk for hepatocellular carcinoma. The detection of aflatoxin-albumin adducts (AFB-ALB) in serum has been used to investigate the relationship between aflatoxin exposure and HCC. A more sensitive and reliable method to detect AFB-ALB in serum was modified by separating serum albumin with Microcon-50 microconcentrators in stead of using precipitation. The method could separate serum albumin quickly and make protein digested in the same container. Thus, the step for transferring samples was reduced and recovery rate was improved. The AFB-ALB adducts were then determined by radioimmunoassay. The AFB-ALB adducts of human serum samples from Qidong, Jiangsu Province, and Fusui, Guangxi Zhuang Autonomous Region of the People's Republic of China were detected. The results indicated that the exposure of AFB1 is common and the positive rate for AFB-ALB adducts in serum of these populations is high.
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Affiliation(s)
- G Sun
- Department of Nutrition and Food Hygiene, School of Public Health, South-east University, Nanjing 210009, China
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44
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He X, Guo X, Qian G, He X, Huang G, Chen W, Li S. [Experimental study on human pulmonary adenocarcinoma cell A549 transfected with HSV₁-TK gene in vitro and in vivo]. Zhongguo Fei Ai Za Zhi 2001; 4:25-8. [PMID: 21040632 DOI: 10.3779/j.issn.1009-3419.2001.01.07] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
BACKGROUND To observe killing effect of HSV₁-TK/GCV system on human pulmonary adenocarcinoma cell A549 in vitro and in vivo. METHODS A retroviral vector containing TK gene was constructed and transduced into pulmonary adenocarcinoma cell A549 by electroporation. The sensitivity of transfected cell to GCV in vitro and bystander effect and cellular apoptosis were observed. The recombination and expression of TK gene were examined by DNA PCR and in situ hybridization individually. In addition, the therapeutic effect of GCV on subcutaneous tumors inoculated with transfected and parental cells respectively was observed. RESULTS The transfected cells were irregular in shape, polyangular and easy of vacuolization. The double time of A549,A549-PLXSN and A549-TK was 36.15±3.27,40.82±3.75 and 42.06±4.12 hours respectively (P>0.05). The sensitivity of transfected cells to GCV was 46 times higher than that of parental cells and bystander effect was more apparent in high density inoculation cells than in low density. Apoptotic bodies and semimoon feature in nuclear were observed in transfected cells, but not in parental cell. Apoptotic cells were found significantly more in transfected cells than in parental cells by FCM and TUNEL (P<0.001). The recombination and expression of TK gene were positive in the transfected cells. In vivo, growth of tumors which formed by transfected cells was significantly inhibited by GCV, however, there was no similar inhibitive effect found in control group. CONCLUSIONS The transfected cells have obtained sensitivity to GCV. The killing effect of TK/GCV system on tumor cells is probably related to apoptosis. GCV could inhibit growth of tumors inoculated by transfected cells.
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Affiliation(s)
- X He
- Department of Respiratory Diseases, Pearl River Hospital, The First Military Medical University, Guangzhou, Guangdong 510282, P.R.China
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Liu Y, Wu M, Qian G, Zhang B, Chen H, Fu J, Huang C. Changes and significance of circulating hepatocellular carcinoma cells in recurrent hepatocellular carcinoma patients after combined treatment. Zhonghua Gan Zang Bing Za Zhi 2001; 9:40-1. [PMID: 11242135] [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] [Subscribe] [Scholar Register] [Indexed: 02/19/2023]
Abstract
OBJECTIVE To study the changes and significance of circulating hepatocellular carcinoma cells in recurrent hepatocellular carcinoma (HCC) patients after combined treatment of transarterial chemo-embolization(TACE) and percutaneous ethanol injection(PEI). METHODS We detected 19 blood samples from the recurrent HCC patients by nested RT-PCR to find out AFP mRNA before and after the treatment. RESULTS There were 7 patients with AFP mRNA positive before treatment (36.8%), and none of patients with AFP mRNA positive after treatment. CONCLUSIONS Combined treatment of TACE and PEI can effectively eliminate circulating hepatocellular carcinoma cells and thereby prevent metastasis and recurrence of HCC.
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Affiliation(s)
- Y Liu
- Institute of East Hepatobiliary Surgery, Second Military Medical University, Shanghai 200433, China
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Liu C, Qian G, Liu H. [Experimental study on suppressive effect of ginkgo extract on adhesion of vascular endothelial cell to monocyte induced by minimally modified low density lipoprotein]. Zhongguo Zhong Xi Yi Jie He Za Zhi 2000; 20:917-9. [PMID: 11938864] [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] [Subscribe] [Scholar Register] [Indexed: 02/24/2023]
Abstract
OBJECTIVE To observe the effect of Ginkgo extract on the interaction between minimally modified low density lipoprotein (MM-LDL) induced human umbilical vein endothelial cell (HUVEC) and U937 monocyte-like cell line. METHODS The adhesive percentage between HUVEC and U937 by counting and the expression of VCAM-1, ICAM-1, P-selectin by ELISA. RESULTS Treatment of HUVEC with MM-LDL (75 micrograms/ml) for 4 hrs could significantly increase the adhesion of U937 to HUVEC (P < 0.01) and Ginkgo extract could suppress the adhesion in dose-dependent manner. The surface expression of VCAM-1, ICAM-1, P-selectin was not induced by MM-LDL, while recombination tumor necrosis factor-alpha 5.0 ng/ml, as a positive control, could do. CONCLUSION Ginkgo extract afforded protection against HUVEC damage induced by MM-LDL and the adhesion of monocytes to endothelial cells induced by MM-LDL is not mediated by VCAM-1, ICAM-1 and P-selectin.
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Affiliation(s)
- C Liu
- Institute of Hematology, Chinese Academy of Medical Sciences, Tianjin 300020
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Si J, Cao Q, Gao M, Fang L, Qian G, Wang Y. Changes in serum ammonia concentration in cirrhotic patients with Helicobacter pylori infection. Chin Med J (Engl) 2000; 113:1080-1. [PMID: 11776140] [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: 02/23/2023] Open
Abstract
OBJECTIVE To study whether liver cirrhosis associated with Helicobacter pylori (H. pylori) infection will induce increased serum ammonia and whether the peripheral serum ammonia reflects the level of portal vein serum ammonia. METHODS Blood was taken from the portal vein and the cubital vein in cirrhotic patients with and without H. pylori infection and non-cirrhotic patients (splenic rupture) with and without H. pylori infection, and the serum ammonia was measured. RESULTS The mean levels of serum ammonia in the group of cirrhotic patients with H. pylori infection were 167.82 +/- 8.97 mumol/L (portal vein) and 142.2 +/- 13.35 mumol/L (cubital vein). They were increased significantly as compared with cirrhotic patients without H. pylori infection (47.68 +/- 12.03 mumol/L portal vein and 37.23 +/- 7.04 mumol/L cubital vein), and also compared with the groups of splenic rupture patients with and without H. pylori infection (P < 0.01). There was no significant difference between the serum ammonia level of the cubital vein and portal vein (P > 0.05). CONCLUSIONS H. pylori infection can induce an increase in serum ammonia in patients with liver dysfunction, and the peripheral serum ammonia measurement may replace the portal vein serum ammonia as a monitoring method. Eradication of H. pylori in cirrhotic patients may prevent hepatic encephalopathy (HE).
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Affiliation(s)
- J Si
- Gastrointestinal Department, Sir Run Run Shaw Hospital, Zhejiang University, Hangzhou 310016, China
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Wang G, Qian G, Mao B. [Effect of hypoxia and carbon monoxide on rat pulmonary arterial smooth muscle cell]. Zhonghua Nei Ke Za Zhi 2000; 39:682-5. [PMID: 11374176] [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] [Subscribe] [Scholar Register] [Indexed: 04/16/2023]
Abstract
OBJECTIVE To investigate the effect of carbon monoxide on rat pulmonary arterial smooth muscle cell (VSMC). METHODS Three groups were randomly divided, (1) Normoxia group(N), (2) Hypoxia group(H), (3) 3% CO + 1% O2 group (CO + H), then tested by immunocytochemical analysis 3H-TdR in incorporation. RESULTS (1) Hypoxia initiated the chang of VSMC from contractile phenotype to synthetic phenotype, the endoplasmic reticulum became dilated, the mitochondria became swollen and myelin figure appeared. alpha-actin and muscle fiber decreased. The form of VSMC in CO + H was similar to that in N. (2) Intracellular Ca2+ level of VSMC in H [4 h, 8 h, 12 h, 24 h, 36 h were (382.00 +/- 37.92) mmol/L, (456.00 +/- 53.76) mmol/L, (517.00 +/- 47.34) mmol/L, (608.00 +/- 35.92) mmol/L, (567.00 +/- 46.72) mmol/L, respectively] increased significantly(P < 0.01) than in N[4 h was(319.00 +/- 47.45) mmol/L], but that in CO + H increased slightly. (3) cAMP and cGMP level of VSMC in H increased significantly, cAMP of VSMC in CO + H increased significantly [2 h, 8 h, 12 h, 24 h were (1.87 +/- 0.36) pmol/mg protein, (2.16 +/- 0.36) pmol/mg protein, (2.36 +/- 0.41) pmol/mg protein, (2.12 +/- 0.39) pmol/mg protein, respectively] but cGMP of VSMC in CO + H increased slightly[2 h, 8 h, 12 h, 24 h were (0.52 +/- 0.21) pmol/mg protein, (0.58 +/- 0.21) pmol/mg protein, (0.60 +/- 0.24) pmol/mg protein, (0.68 +/- 0.29) pmol/mg protein, respectively]. CONCLUSION Hypoxia may promote the proliferation of VSMC by second messenger system and CO in low desities can depress the action of hypoxia partly by Ca(2+)-cGMP system or by the expression of E2F-1 gene.
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Affiliation(s)
- G Wang
- Institute of Respiratory Disease, Xinqiao Hospital, Third Military Medical University, Changqing 400037, China
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Hu Y, Qian G, Mao B, Xiao T, Li Y, Cao S. [Malignant transformation of mouse embryonic fibroblast induced by mitochondrial DNA fragments]. Zhonghua Bing Li Xue Za Zhi 2000; 29:39-42. [PMID: 11866891] [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] [Subscribe] [Scholar Register] [Indexed: 02/23/2023]
Abstract
OBJECTIVE To investigate the malignant transforming effect and mechanism of mitochondrial DNA (mtDNA) fragments. METHODS Tumorigenicity of mtDNA-transformed mouse embryonic fibroblast (NIH3T3) in nude mice was studied using transgenic techniques. Transformed tumors were detected by pathological examination and hybridization signals of mtDNA probe were analyzed by fluorescence in situ hybridization (FISH) techniques. RESULTS Hybridization signals were observed on the nuclei of 18% - 20% NIH 3T3 cells 1 week after mtDNA fragments transforming. Tumor from mtDNA-transformed NIH 3T3 cells was developed in all 8 nude mice (8/8) respectively 2 weeks after the transformation. The pathological characteristics of the tumors developed were similar to that of fibrosarcoma. CONCLUSIONS Auto-integration of mtDNA fragments into nuclear genome is a new factor involved in carcinogenesis.
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Affiliation(s)
- Y Hu
- PLA Institute of Respiratory Diseases, Xinqiao Hospital, Third Military Medical University, Chongqing 400037, China.
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Song Y, Mao B, Qian G. [Effects of dexamethasone on apoptosis and expression of Fas/FasL system in lung tissues of ALI rats]. Zhonghua Jie He He Hu Xi Za Zhi 2000; 23:23-6. [PMID: 11778176] [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] [Subscribe] [Scholar Register] [Indexed: 02/23/2023]
Abstract
OBJECTIVE To determine whether apoptosis occurs in the lung tissues from rats with acute lung injury (ALI), and observe protective effects of dexamethasone by regulating apoptosis of lung tissues in rats with ALI. METHODS By using TUNEL, in situ hybridization, SqRT-PCR and immunocytochemistry techniques, apoptosis and Fas, FasL expression were studied during early phase of ALI in rats. RESULTS LPS leads to the rapid appearance of apoptosis in alveolar epithelial cells and pulmonary vascular endothelial cells at early stage of ALI in rats. The expression of Fas, FasL mRNA and protein was up-regulated in lung tissues of rats with ALI. The administration of dexamethasone suppressed apoptosis as well as expression of Fas, FasL mRNA and protein, inhibited TNF-alpha production and abated lung injury. CONCLUSIONS The excessive apoptosis and Fas/FasL system may play a role in the pathogenesis of LPS-induced ALI in rats. The protective effects of dexamethasone include inhibiting inflammatory mediators production, suppressing the activation of Fas/FasL system and apoptosis in lung tissues of ALI rats.
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Affiliation(s)
- Y Song
- Department of Respiratory Medicine, Nanjing General Hospital of Nanjing Command, Nanjing 210002, China
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