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Chen F, Zhang Y, Peng P, Huang XT, Qiu ZH, Liu BC, Yang TL, Yang B, Guo Y. Isolation and culture of human primary osteoblasts: Comparing the effects of differences in method details on osteoblast characteristics. Genes Dis 2024; 11:546-549. [PMID: 37692490 PMCID: PMC10491899 DOI: 10.1016/j.gendis.2023.03.024] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2022] [Revised: 03/19/2023] [Accepted: 03/20/2023] [Indexed: 09/12/2023] Open
Affiliation(s)
- Fei Chen
- Key Laboratory of Biomedical Information Engineering of Ministry of Education, Biomedical Informatics & Genomics Center, School of Life Science and Technology, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China
| | - Yan Zhang
- Key Laboratory of Biomedical Information Engineering of Ministry of Education, Biomedical Informatics & Genomics Center, School of Life Science and Technology, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China
| | - Pai Peng
- Key Laboratory of Biomedical Information Engineering of Ministry of Education, Biomedical Informatics & Genomics Center, School of Life Science and Technology, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China
| | - Xiao-Ting Huang
- Key Laboratory of Biomedical Information Engineering of Ministry of Education, Biomedical Informatics & Genomics Center, School of Life Science and Technology, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China
| | - Zi-Han Qiu
- Key Laboratory of Biomedical Information Engineering of Ministry of Education, Biomedical Informatics & Genomics Center, School of Life Science and Technology, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China
| | - Bao-Cheng Liu
- Department of Orthopaedics, Shannxi Provincial People's Hospital (The Third Affiliated Hospital of Xi'an Jiaotong University), Xi'an, Shaanxi 710068, China
| | - Tie-Lin Yang
- Key Laboratory of Biomedical Information Engineering of Ministry of Education, Biomedical Informatics & Genomics Center, School of Life Science and Technology, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China
| | - Bo Yang
- Department of Orthopaedics, Shannxi Provincial People's Hospital (The Third Affiliated Hospital of Xi'an Jiaotong University), Xi'an, Shaanxi 710068, China
| | - Yan Guo
- Key Laboratory of Biomedical Information Engineering of Ministry of Education, Biomedical Informatics & Genomics Center, School of Life Science and Technology, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China
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Chen N, Song DD, Qiu ZH, Cui B, Diao YG. [Effect of high flow nasal catheter oxygen to prevent hypoxemia in endoscopic retrograde cholangiopancreatography surgery in aged]. Zhonghua Yi Xue Za Zhi 2023; 103:3273-3278. [PMID: 37926571 DOI: 10.3760/cma.j.cn112137-20230414-00612] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Subscribe] [Scholar Register] [Indexed: 11/07/2023]
Abstract
Objective: To explore the effect of high-flow nasal catheter oxygen inhalation in preventing hypoxemia during endoscopic retrograde cholangiopancreatography (ERCP) surgery in elderly patients. Methods: From September 2021 to September 2022, 116 elderly patients (aged ≥ 70 years) who underwent elective ERCP in the Northern Theater General Hospital were prospectively selected, then divided into general nasal catheter oxygen inhalation group [group C, 31 males and 27 females, aged (79.8±6.4) years] and high-flow nasal catheter oxygen inhalation group [group H, 33 males and 25 females, aged (81.4±6.7) years], with 58 patients in each group. All patients were monitored for anesthesia by target-controlled infusion of propofol and remifentanil. The main outcome index was the incidence of intraoperative subclinical hypoxemia (90% ≤ SpO2 < 95%, duration >5 s), hypoxemia (75% < SpO2 < 90%, 5 s < duration ≤ 60 s) and severe hypoxemia (SpO2 < 75% or SpO2 < 90%, duration > 60 s). Secondary observation measures were SpO2 from T0 to T5 (T0, before anesthesia induction; T1, immediately after anesthesia induction; T2, endoscopic introduction; T3, duodenal papula intubation; T4, endoscopic withdrawal; T5, postoperative awakening), the arterial oxygen partial pressure (PaO2), carbon dioxide partial pressure (PaCO2) and pH at T0, 15 min after the induction and T5. Results: The incidence of intraoperative subclinical hypoxemia in group C and group H was 12.0% (7/58) and 3.4% (2/58) respectively, which showed no significant statistical difference (P=0.165) from each other. The incidence of intraoperative hypoxemia in group H was 8.6% (5/58), which was significantly lower than 31.0% (18/58) of group C (P=0.003). Neither group had intraoperative severe hypoxemia. SpO2 of group H were (98.2±0.9)%, (98.2±0.9)%, (97.8±1.7)% and (97.7±1.7)% at T1, T2, T3, T4, which were higher than (96.8±2.1)%, (96.4±3.0)%, (96.1±2.9)% and (96.4±3.4)% in group C (all P<0.05). PaO2 at 15 min after induction in group H was (240.5±46.7) mmHg (1 mmHg=0.133 kPa), which was higher than that of group C (170.6±33.4) mmHg (P<0.001). There was no statistically significant difference in pH and PaCO2 between the two groups of patients at each timepoint. Conclusion: High flow nasal catheter oxygen can effectively reduce the incidence of hypoxemia in ERCP in elderly patients.
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Affiliation(s)
- N Chen
- Department of Anesthesiology, Northern Theater Command General Hospital, Shenyang 110016, China
| | - D D Song
- Department of Anesthesiology, Northern Theater Command General Hospital, Shenyang 110016, China
| | - Z H Qiu
- Department of Anesthesiology, Northern Theater Command General Hospital, Shenyang 110016, China
| | - B Cui
- Department of Anesthesiology, Northern Theater Command General Hospital, Shenyang 110016, China
| | - Y G Diao
- Department of Anesthesiology, Northern Theater Command General Hospital, Shenyang 110016, China
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Lin YW, Kang WP, Hong CQ, Huang BL, Qiu ZH, Liu CT, Chu LY, Xu YW, Guo HP, Wu FC. Nutritional and immune-related indicators-based Nomogram for predicting overall survival of surgical oral tongue squamous cell carcinoma. Sci Rep 2023; 13:8525. [PMID: 37237026 DOI: 10.1038/s41598-023-35244-y] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2023] [Accepted: 05/15/2023] [Indexed: 05/28/2023] Open
Abstract
Oral tongue squamous cell carcinoma (OTSCC) is one of the most aggressive oral tumors. The aim of this study was to establish a nomogram to predict overall survival (OS) of TSCC patients after surgery. 169 TSCC patients who underwent surgical treatments in the Cancer Hospital of Shantou University Medical College were included. A nomogram based on Cox regression analysis results was established and internally validated using bootstrap resampling method. pTNM stage, age and total protein, immunoglobulin G, factor B and red blood cell count were identified as independent prognostic factors to create the nomogram. The Akaike Information Criterion and Bayesian Information Criterion of the nomogram were lower than those of pTNM stage, indicating a better goodness-of-fit of the nomogram for predicting OS. The bootstrap-corrected concordance index of nomogram was higher than that of pTNM stage (0.794 vs. 0.665, p = 0.0008). The nomogram also had a good calibration and improved overall net benefit. Based on the cutoff value obtained from the nomogram, the proposed high-risk group had poorer OS than low-risk group (p < 0.0001). The nomogram based on nutritional and immune-related indicators represents a promising tool for outcome prediction of surgical OTSCC.
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Affiliation(s)
- Yi-Wei Lin
- Department of Clinical Laboratory Medicine, the Cancer Hospital of Shantou University Medical College, Shantou, 515041, China
- Esophageal Cancer Prevention and Control Research Center, the Cancer Hospital of Shantou University Medical College, Shantou, 515041, China
| | - Wei-Piao Kang
- Department of Otolaryngology, the Second Affiliated Hospital of Shantou University Medical College, Shantou, 515041, China
| | - Chao-Qun Hong
- Esophageal Cancer Prevention and Control Research Center, the Cancer Hospital of Shantou University Medical College, Shantou, 515041, China
- Department of Oncological Laboratory Research, the Cancer Hospital of Shantou University Medical College, Shantou, 515041, China
| | - Bin-Liang Huang
- Department of Clinical Laboratory Medicine, the Cancer Hospital of Shantou University Medical College, Shantou, 515041, China
- Esophageal Cancer Prevention and Control Research Center, the Cancer Hospital of Shantou University Medical College, Shantou, 515041, China
| | - Zi-Han Qiu
- The First Affiliated Hospital of Shantou University Medical College, Shantou, 515041, China
| | - Can-Tong Liu
- Department of Clinical Laboratory Medicine, the Cancer Hospital of Shantou University Medical College, Shantou, 515041, China
- Esophageal Cancer Prevention and Control Research Center, the Cancer Hospital of Shantou University Medical College, Shantou, 515041, China
| | - Ling-Yu Chu
- Department of Clinical Laboratory Medicine, the Cancer Hospital of Shantou University Medical College, Shantou, 515041, China
- Esophageal Cancer Prevention and Control Research Center, the Cancer Hospital of Shantou University Medical College, Shantou, 515041, China
| | - Yi-Wei Xu
- Department of Clinical Laboratory Medicine, the Cancer Hospital of Shantou University Medical College, Shantou, 515041, China.
- Esophageal Cancer Prevention and Control Research Center, the Cancer Hospital of Shantou University Medical College, Shantou, 515041, China.
- Guangdong Esophageal Cancer Institute, Shantou University Medical College, Shantou, 515041, China.
| | - Hai-Peng Guo
- Department of Head and Neck Surgery, the Cancer Hospital of Shantou University Medical College, Shantou, 515041, China.
| | - Fang-Cai Wu
- Department of Radiation Oncology, the Cancer Hospital of Shantou University Medical College, Shantou, 515041, China.
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Qiu ZH, Zeng J, Zuo Q, Liu ZQ. External penetrating laryngeal trauma caused by a metal fragment: A Case Report. World J Clin Cases 2022; 10:1394-1400. [PMID: 35211575 PMCID: PMC8855201 DOI: 10.12998/wjcc.v10.i4.1394] [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] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/05/2021] [Revised: 12/08/2021] [Accepted: 12/23/2021] [Indexed: 02/06/2023] Open
Abstract
BACKGROUND Although external penetrating laryngeal trauma is rare in the clinic, such cases often result in a high mortality rate. The early recognition of injury, protection of the airway, one-stage laryngeal reconstruction with miniplates and interdisciplinary cooperation are important in the treatment of such patients.
CASE SUMMARY A 58-year-old male worker sustained a penetrating injury in the left neck. After computed tomography scanning at a local hospital, he was transferred to our hospital, where he underwent tracheotomy, neck exploration, extraction of the foreign object, debridement and repair of the thyroid cartilage using titanium miniplates. An endo laryngeal stent was inserted, which was removed 12 days later. The patient recovered well and his voice rapidly improved after surgery.
CONCLUSION Penetrating laryngeal trauma is uncommon. We successfully treated a patient with early laryngeal reconstruction and management by interdisciplinary cooperation.
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Affiliation(s)
- Zi-Han Qiu
- Department of Otolaryngology-Head and Neck Surgery, the First Affiliated Hospital of Shantou University Medical College, Shantou 515041, Guangdong Province, China
| | - Jin Zeng
- Department of Otolaryngology Head and Neck Surgery, Peking University Third Hospital, Beijing 100191, China
| | - Qiang Zuo
- Department of Otolaryngology Head and Neck Surgery, Peking University Third Hospital, Beijing 100191, China
| | - Zhong-Qi Liu
- Department of Otolaryngology Head and Neck Surgery, Peking University Third Hospital, Beijing 100191, China
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Luo LM, Huang BT, Chen CZ, Wang Y, Su CH, Peng GB, Zeng CB, Wu YX, Wang RH, Huang K, Qiu ZH. A Combined Model to Improve the Prediction of Local Control for Lung Cancer Patients Undergoing Stereotactic Body Radiotherapy Based on Radiomic Signature Plus Clinical and Dosimetric Parameters. Front Oncol 2022; 11:819047. [PMID: 35174072 PMCID: PMC8841423 DOI: 10.3389/fonc.2021.819047] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2021] [Accepted: 12/31/2021] [Indexed: 02/05/2023] Open
Abstract
PURPOSE Stereotactic body radiotherapy (SBRT) is an important treatment modality for lung cancer patients, however, tumor local recurrence rate remains some challenge and there is no reliable prediction tool. This study aims to develop a prediction model of local control for lung cancer patients undergoing SBRT based on radiomics signature combining with clinical and dosimetric parameters. METHODS The radiomics model, clinical model and combined model were developed by radiomics features, incorporating clinical and dosimetric parameters and radiomics signatures plus clinical and dosimetric parameters, respectively. Three models were established by logistic regression (LR), decision tree (DT) or support vector machine (SVM). The performance of models was assessed by receiver operating characteristic curve (ROC) and DeLong test. Furthermore, a nomogram was built and was assessed by calibration curve, Hosmer-Lemeshow and decision curve. RESULTS The LR method was selected for model establishment. The radiomics model, clinical model and combined model showed favorite performance and calibration (Area under the ROC curve (AUC) 0.811, 0.845 and 0.911 in the training group, 0.702, 0.786 and 0.818 in the validation group, respectively). The performance of combined model was significantly superior than the other two models. In addition, Calibration curve and Hosmer-Lemeshow (training group: P = 0.898, validation group: P = 0.891) showed good calibration of combined nomogram and decision curve proved its clinical utility. CONCLUSIONS The combined model based on radiomics features plus clinical and dosimetric parameters can improve the prediction of 1-year local control for lung cancer patients undergoing SBRT.
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Affiliation(s)
- Li-Mei Luo
- Department of Radiation Oncology, Shantou University Medical College, Shantou, China
- Department of Radiation Oncology, Cancer Hospital of Shantou University Medical College, Shantou, China
| | - Bao-Tian Huang
- Department of Radiation Oncology, Cancer Hospital of Shantou University Medical College, Shantou, China
| | - Chuang-Zhen Chen
- Department of Radiation Oncology, Cancer Hospital of Shantou University Medical College, Shantou, China
| | - Ying Wang
- Department of Radiation Oncology, Shantou University Medical College, Shantou, China
- Department of Radiation Oncology, Cancer Hospital of Shantou University Medical College, Shantou, China
| | - Chuang-Huang Su
- Department of Radiation Oncology, Shantou Central Hospital, Shantou, China
| | - Guo-Bo Peng
- Department of Radiation Oncology, Meizhou People’s Hospital (Huangtang Hospital), Meizhou Academy of Medical Sciences, Meizhou, China
| | - Cheng-Bing Zeng
- Department of Radiation Oncology, Cancer Hospital of Shantou University Medical College, Shantou, China
| | - Yan-Xuan Wu
- Department of Radiation Oncology, Cancer Hospital of Shantou University Medical College, Shantou, China
| | - Ruo-Heng Wang
- Department of Radiation Oncology, Shantou University Medical College, Shantou, China
- Department of Radiation Oncology, Cancer Hospital of Shantou University Medical College, Shantou, China
| | - Kang Huang
- Department of Radiation Oncology, Shantou University Medical College, Shantou, China
- Department of Radiation Oncology, Cancer Hospital of Shantou University Medical College, Shantou, China
| | - Zi-Han Qiu
- Department of Otolaryngology-Head and Neck Surgery, The First Affiliated Hospital of Shantou University Medical College, Shantou, China
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Ren Y, Qiu ZH, Wu WH, Dong XG, Han S, Zhang FL, Kong FL, Li FE. Hypertriglyceridemic waist phenotype: Association with initial neurological severity and etiologic subtypes in patients with acute ischemic stroke. Front Endocrinol (Lausanne) 2022; 13:1024398. [PMID: 36531467 PMCID: PMC9751905 DOI: 10.3389/fendo.2022.1024398] [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] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/21/2022] [Accepted: 11/03/2022] [Indexed: 12/02/2022] Open
Abstract
OBJECTIVE To explore the relationship of hypertriglyceridemic waist phenotype (HTWP) with initial neurological severity and etiologic subtypes in patients with acute ischemic stroke. METHODS The data for this study were collected from hospitalized patients within 72 h of acute ischemic stroke onset at the Department of Neurology of the Affiliated Hospital of Beihua University from 1 July 2020 to 30 June 2022. The initial neurological severity was assessed by the National Institute of Health Stroke Scale (NIHSS) on the day of admission: NIHSS <6 was defined as mild stroke, and NIHSS ≥6 as moderate to severe stroke. HTWP was defined by fasting serum triglycerides ≥1.7 mmol/L and waist circumference ≥90 cm in men and ≥80 cm in women. Differentiation of etiologic subtypes was based on the method reported in the Trial of Org 10 172 in Acute Stroke Treatment. Multivariate logistic regression analysis was used to analyze the association of HTWP with initial neurological severity and etiologic subtypes. RESULTS The study included 431 patients. Compared with the normal waist-normal blood triglyceride group, patients with HTWP had reduced risks of moderate to severe stroke [odds ratio (OR): 0.384, 95% confidence interval (CI): 0.170-0.869; P = 0.022]. In addition, the risk of small-artery occlusion stroke was 2.318 times higher in the HTWP group than in the normal triglyceride-normal waist (NWNT) group (OR: 2.318, 95% CI: 1.244-4.319; P = 0.008). CONCLUSION Initial neurological severity was less severe in patients with HTWP, and HTWP was associated with an increased risk of small-artery occlusion stroke.
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Affiliation(s)
- Yuan Ren
- Department of Postgraduate, School of Clinical Medicine, Beihua University, Jilin, China
- Department of Neurology, Zhujiang Hospital, Southern Medical University, Guangzhou, China
| | - Zi-Han Qiu
- Department of Postgraduate, School of Clinical Medicine, Beihua University, Jilin, China
| | - Wei-Hua Wu
- Department of Neurology, the Affiliated Hospital of Beihua University, Jilin, China
| | - Xiao-Guang Dong
- Department of Neurology, the Affiliated Hospital of Beihua University, Jilin, China
| | - Shuang Han
- Department of Postgraduate, School of Clinical Medicine, Beihua University, Jilin, China
| | - Fu-Liang Zhang
- Department of Neurology, The First Hospital of Jilin University, Changchun, China
| | - Fan-Li Kong
- Department of Neurology, The First Hospital of Jilin University, Changchun, China
- *Correspondence: Fan-Li Kong, ; Feng-E Li,
| | - Feng-E Li
- Department of Neurology, the Affiliated Hospital of Beihua University, Jilin, China
- *Correspondence: Fan-Li Kong, ; Feng-E Li,
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Lin YW, Kang WP, Huang BL, Qiu ZH, Wei LF, Zhang B, Ding TY, Luo Y, Liu CT, Chu LY, Guo HP, Xu YW, Peng YH. Nomogram based on clinical characteristics and serological inflammation markers to predict overall survival of oral tongue squamous cell carcinoma patient after surgery. BMC Oral Health 2021; 21:667. [PMID: 34961504 PMCID: PMC8711158 DOI: 10.1186/s12903-021-02028-7] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2021] [Accepted: 12/14/2021] [Indexed: 02/07/2023] Open
Abstract
BACKGROUND Oral tongue squamous cell carcinoma (OTSCC) is a prevalent malignant disease that is characterized by high rates of metastasis and postoperative recurrence. The aim of this study was to establish a nomogram to predict the outcome of OTSCC patients after surgery. METHODS We retrospectively analyzed 169 OTSCC patients who underwent treatments in the Cancer Hospital of Shantou University Medical College from 2008 to 2019. The Cox regression analysis was performed to determine the independent prognostic factors associated with patient's overall survival (OS). A nomogram based on these prognostic factors was established and internally validated using a bootstrap resampling method. RESULTS Multivariate Cox regression analysis revealed the independent prognostic factors for OS were TNM stage, age, lymphocyte-to-monocyte ratio and immunoglobulin G, all of which were identified to create the nomogram. The Akaike Information Criterion and Bayesian Information Criterion of the nomogram were lower than those of TNM stage (292.222 vs. 305.480; 298.444 vs. 307.036, respectively), indicating a better goodness-of-fit of the nomogram for predicting OS. The bootstrap-corrected of concordance index (C-index) of nomogram was 0.784 (95% CI 0.708-0.860), which was higher than that of TNM stage (0.685, 95% CI 0.603-0.767, P = 0.017). The results of time-dependent C-index for OS also showed that the nomogram had a better discriminative ability than that of TNM stage. The calibration curves of the nomogram showed good consistency between the probabilities and observed values. The decision curve analysis also revealed the potential clinical usefulness of the nomogram. Based on the cutoff value obtained from the nomogram, the proposed high-risk group had poorer OS than low-risk group (P < 0.0001). CONCLUSIONS The nomogram based on clinical characteristics and serological inflammation markers might be useful for outcome prediction of OTSCC patient.
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Affiliation(s)
- Yi-Wei Lin
- Department of Clinical Laboratory Medicine, The Cancer Hospital of Shantou University Medical College, Shantou, 515041, Guangdong, People's Republic of China
- Precision Medicine Research Center, Shantou University Medical College, Shantou, 515041, Guangdong, People's Republic of China
| | - Wei-Piao Kang
- Department of Otolaryngology, The Second Affiliated Hospital of Shantou University Medical College, Shantou, 515041, Guangdong, People's Republic of China
| | - Bin-Liang Huang
- Department of Clinical Laboratory Medicine, The Cancer Hospital of Shantou University Medical College, Shantou, 515041, Guangdong, People's Republic of China
- Precision Medicine Research Center, Shantou University Medical College, Shantou, 515041, Guangdong, People's Republic of China
| | - Zi-Han Qiu
- Department of Otolaryngology-Head and Neck Surgery, The First Affiliated Hospital of Shantou University Medical College, Shantou, 515041, Guangdong, People's Republic of China
| | - Lai-Feng Wei
- Department of Clinical Laboratory Medicine, The Cancer Hospital of Shantou University Medical College, Shantou, 515041, Guangdong, People's Republic of China
- Precision Medicine Research Center, Shantou University Medical College, Shantou, 515041, Guangdong, People's Republic of China
| | - Biao Zhang
- Department of Clinical Laboratory Medicine, The Cancer Hospital of Shantou University Medical College, Shantou, 515041, Guangdong, People's Republic of China
- Precision Medicine Research Center, Shantou University Medical College, Shantou, 515041, Guangdong, People's Republic of China
| | - Tian-Yan Ding
- Department of Clinical Laboratory Medicine, The Cancer Hospital of Shantou University Medical College, Shantou, 515041, Guangdong, People's Republic of China
- Precision Medicine Research Center, Shantou University Medical College, Shantou, 515041, Guangdong, People's Republic of China
| | - Yun Luo
- Department of Clinical Laboratory Medicine, The Cancer Hospital of Shantou University Medical College, Shantou, 515041, Guangdong, People's Republic of China
- Precision Medicine Research Center, Shantou University Medical College, Shantou, 515041, Guangdong, People's Republic of China
| | - Can-Tong Liu
- Department of Clinical Laboratory Medicine, The Cancer Hospital of Shantou University Medical College, Shantou, 515041, Guangdong, People's Republic of China
- Precision Medicine Research Center, Shantou University Medical College, Shantou, 515041, Guangdong, People's Republic of China
| | - Ling-Yu Chu
- Department of Clinical Laboratory Medicine, The Cancer Hospital of Shantou University Medical College, Shantou, 515041, Guangdong, People's Republic of China
- Precision Medicine Research Center, Shantou University Medical College, Shantou, 515041, Guangdong, People's Republic of China
| | - Hai-Peng Guo
- Department of Head and Neck Surgery, The Cancer Hospital of Shantou University Medical College, Shantou, 515041, Guangdong, People's Republic of China.
| | - Yi-Wei Xu
- Department of Clinical Laboratory Medicine, The Cancer Hospital of Shantou University Medical College, Shantou, 515041, Guangdong, People's Republic of China.
- Precision Medicine Research Center, Shantou University Medical College, Shantou, 515041, Guangdong, People's Republic of China.
- Guangdong Esophageal Cancer Institute, The Cancer Hospital of Shantou University Medical College, Shantou, 515041, Guangdong, People's Republic of China.
| | - Yu-Hui Peng
- Department of Clinical Laboratory Medicine, The Cancer Hospital of Shantou University Medical College, Shantou, 515041, Guangdong, People's Republic of China.
- Precision Medicine Research Center, Shantou University Medical College, Shantou, 515041, Guangdong, People's Republic of China.
- Guangdong Esophageal Cancer Institute, The Cancer Hospital of Shantou University Medical College, Shantou, 515041, Guangdong, People's Republic of China.
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Lin Y, Kang W, Huang B, Qiu Z, Wei L, Zhang B, Ding T, Luo Y, Liu C, Chu L, Guo H, Xu Y, Peng Y. Nomogram Based On Clinical Characteristics and Serological Inflammation Markers To Predict Overall Survival of Tongue Squamous Cell Carcinoma Patient After Surgery.. [DOI: 10.21203/rs.3.rs-900581/v1] [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] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
Abstract
Background
Tongue squamous cell carcinoma (TSCC) is a prevalent malignant disease that is characterized by high rates of metastasis and postoperative recurrence. The aim of this study was to establish a nomogram to predict the outcome of TSCC patients after surgery.
Methods
We retrospectively analyzed 169 TSCC patients who underwent treatments in the Cancer Hospital of Shantou University Medical College from 2008 to 2019. The Cox regression analysis was performed to determine the independent prognostic factors associated with patient’s overall survival (OS). A nomogram based on these prognostic factors was established and internally validated using a bootstrap resampling method.
Results
Multivariate Cox regression analysis revealed the independent prognostic factors for OS were TNM stage, age, lymphocyte-to-monocyte ratio and immunoglobulin G, all of which were identified to create the nomogram. The Akaike Information Criterion and Bayesian Information Criterion of the nomogram were lower than those of TNM stage (292.222 vs. 305.480; 298.444 vs. 307.036, respectively), indicating a better goodness-of-fit of the nomogram for predicting OS. The bootstrap-corrected of concordance index (C-index) of nomogram was 0.784 (95% CI: 0.708–0.860), which was higher than that of TNM stage (0.685, 95% CI: 0.603–0.767, P = 0.017). The results of time-dependent C-index for OS also showed that the nomogram had a better discriminative ability than that of TNM stage. The calibration curves of the nomogram showed good consistency between the probabilities and observed values. The decision curve analysis also revealed the potential clinical usefulness of the nomogram. Based on the cutoff value obtained from the nomogram, the proposed high-risk group had poorer OS than low-risk group (P < 0.0001).
Conclusions
The nomogram based on clinical characteristics and serological inflammation markers might be useful for outcome prediction of TSCC patient.
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Affiliation(s)
- Yi-Wei Lin
- the Cancer Hospital of Shantou University Medical College
| | - Wei-Piao Kang
- the Second Affiliated Hospital of Shantou University Medical College
| | | | - Zi-Han Qiu
- The First Affiliated Hospital of Shantou University Medical College
| | - Lai-Feng Wei
- the Cancer Hospital of Shantou University Medical College
| | - Biao Zhang
- the Cancer Hospital of Shantou University Medical College
| | - Tian-Yan Ding
- the Cancer Hospital of Shantou University Medical College
| | - Yun Luo
- the Cancer Hospital of Shantou University Medical College
| | - Can-Tong Liu
- the Cancer Hospital of Shantou University Medical College
| | - Ling-Yu Chu
- the Cancer Hospital of Shantou University Medical College
| | - Hai-Peng Guo
- the Cancer Hospital of Shantou University Medical College
| | - Yi-Wei Xu
- the Cancer Hospital of Shantou University Medical College
| | - Yu-Hui Peng
- the Cancer Hospital of Shantou University Medical College
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Zhang WB, Du QJ, Li H, Sun AJ, Qiu ZH, Wu CN, Zhao G, Gong H, Hu K, Zou YZ, Ge JB. The therapeutic effect of rosuvastatin on cardiac remodelling from hypertrophy to fibrosis during the end-stage hypertension in rats. J Cell Mol Med 2013; 16:2227-37. [PMID: 22288611 PMCID: PMC3822992 DOI: 10.1111/j.1582-4934.2012.01536.x] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
End-stage hypertensive heart disease is an increasing cause of cardiac mortality. Therefore, the current study focused on the cardiac remodelling from hypertrophy to fibrosis in old-aged spontaneously hypertensive rats (SHRs), and explored the therapeutic effects of Rosuvastatin and its possible mechanism(s) of action. Spontaneously hypertensive rats at age 52 weeks were randomly divided into three groups, the first two to receive Rosuvastatin at a dose of 20 mg/kg/day and 40 mg/kg/day, respectively, and the third to receive placebo, which was to be compared with Wistar-Kyoto as controls. After 2-month treatment, SBP, heart to body weight ratio (HW/BW%) and echocardiographic features were evaluated, followed by haematoxylin and eosin and Masson trichrome staining in conjunction with qPCR of foetal gene expressions. Transferase-mediated dUTP nick-end labelling assay and immunofluorescent labelling for active caspase-3 were used to detect the apoptotic cardiomyocytes. Signaling pathways involved were examined by using western blot. Old-aged SHR developed end-stage hypertensive heart disease characterized by significant enhancement of HW/BW%, LVAWd and LVPWd, and decreased LVEF and LVFS, accompanied by cardiomyocytes enlargement and fibrosis along with activation of foetal gene programme. Cardiac apoptosis increased significantly during the transition process. Rosuvastatin reduced hypertrophy significantly via AT1 Receptor-PKCβ2/α-ERK-c-fos pathway; protected myocardium against apoptosis via Akt-FOXO1, Bcl-2 family and survivin pathways and consequently suppressed the caspase-3 activity. The present study revealed that old-aged SHRs developed cardiac remodelling from hypertrophy to fibrosis via cardiac apoptosis during the end stage of hypertensive heart disease. These pathological changes might be the consequence of activation of AT1 Receptor-PKCβ2/α-ERK-c-fos and AKT-FOXO1/Bcl-2/survivin/Caspase3 signaling. Rosuvastatin effectively attenuated the structural changes by reversing the signaling transductions involved.
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Affiliation(s)
- W B Zhang
- Shanghai Institute of Cardiovascular Diseases, Zhongshan Hospital, Fudan University, Shanghai, China
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Qiu ZH, Gijón MA, de Carvalho MS, Spencer DM, Leslie CC. The role of calcium and phosphorylation of cytosolic phospholipase A2 in regulating arachidonic acid release in macrophages. J Biol Chem 1998; 273:8203-11. [PMID: 9525925 DOI: 10.1074/jbc.273.14.8203] [Citation(s) in RCA: 179] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Arachidonic acid release is induced in macrophages with diverse agonists including calcium ionophores, phorbol myristate acetate (PMA), okadaic acid, and the phagocytic particle, zymosan, and correlates with activation of cytosolic phospholipase A2 (cPLA2). The role of calcium and phosphorylation of cPLA2 in regulating arachidonic acid release was investigated. Zymosan induced a rapid and transient increase in [Ca2+]i. This in itself is not sufficient to induce arachidonic acid release since ATP and platelet activating factor (PAF), agonists that induce transient calcium mobilization in macrophages, induced little arachidonic acid release. Unlike zymosan, which is a strong activator of mitogen-activated protein kinase (MAPK), ATP and PAF were weak MAPK activators and induced only a partial and transient increase in cPLA2 phosphorylation (gel shift). However, ATP or PAF together with colony stimulating factor-1 (CSF-1) synergistically stimulated arachidonic acid release. CSF-1 is a strong MAPK activator that induces a rapid and complete cPLA2 gel shift but not calcium mobilization or arachidonic acid release. Arachidonic acid release was more rapid in response to CSF-1 plus ATP or PAF than zymosan and correlated with the time course of the cPLA2 gel shift. Although low concentrations of ionomycin induced a lower magnitude of calcium mobilization than ATP, the response was more sustained resulting in arachidonic acid release. A23187 and ionomycin induced weak MAPK activation, and a partial and transient cPLA2 gel shift. The MAPK kinase inhibitor, PD 98059 suppressed A23187-induced MAPK activation and cPLA2 gel shift but had little effect on arachidonic acid release. These results indicate that in macrophages a transient increase in [Ca2+]i and sustained phosphorylation of cPLA2 can act together to promote arachidonic acid release but neither alone is sufficient. A sustained increase in calcium is sufficient for inducing arachidonic acid release. However, PMA and okadaic acid induce arachidonic acid release without increasing [Ca2+]i, although resting levels of calcium are required, suggesting alternative mechanisms of regulation.
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Affiliation(s)
- Z H Qiu
- Division of Basic Science, Department of Pediatrics, National Jewish Medical and Research Center, Denver, Colorado 80206, USA
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Qiu ZH, He FC. [Regulation of liver regeneration by hepatocyte growth factor-humor and hepatocyte growth factor-cytosol]. Sheng Li Ke Xue Jin Zhan 1995; 26:256-8. [PMID: 8584897] [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: 01/31/2023]
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12
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Xu XX, Rock CO, Qiu ZH, Leslie CC, Jackowski S. Regulation of cytosolic phospholipase A2 phosphorylation and eicosanoid production by colony-stimulating factor 1. J Biol Chem 1994; 269:31693-700. [PMID: 7989342] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
Abstract
A colony-stimulating factor 1 (CSF-1)-dependent murine macrophage cell line (BAC1.2F5) and peritoneal macrophages were used to investigate the relationship between growth factor-dependent phosphorylation/activation of the 85-kDa cytosolic phospholipase A2 (cPLA2) and arachidonic acid metabolism. The addition of CSF-1 to quiescent BAC1.2F5 cells was followed by the rapid phosphorylation, electrophoretic gel retardation, and stable increase in the specific activity of cPLA2 that correlated with the activation of ERK kinases. cPLA2 phosphorylation depended on the presence of growth factor and persisted throughout the cell cycle. CSF-1 inhibited prostaglandin E2 production and did not enhance arachidonic acid release or increase the levels of lysophosphatidylcholine or glycerophosphocholine. Treatment of BAC1.2F5 cells with the calcium ionophore A23187 plus CSF-1 did not stimulate eicosanoid release. Instead, CSF-1 enhanced the rate of exogenous arachidonic acid incorporation into phosphatidylcholine and its subsequent transfer to phosphatidylethanolamine suggesting that higher rates of arachidonic acid acylation may contribute to the suppression of prostaglandin production. In peritoneal macrophages, ERK kinase activity was stimulated and cPLA2 was phosphorylated and activated in response to CSF-1. However, CSF-1 did not trigger eicosanoid release but did augment arachidonic acid mobilization and prostaglandin E2 production elicited by zymosan and A23187. Thus, cPLA2 phosphorylation/activation and calcium mobilization are not the only determinants for eicosanoid release, and additional components in differentiated tissue macrophages are also required.
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Affiliation(s)
- X X Xu
- Department of Biochemistry, St. Jude Children's Research Hospital, Memphis, Tennessee 38101
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Qiu ZH, Leslie CC. Protein kinase C-dependent and -independent pathways of mitogen-activated protein kinase activation in macrophages by stimuli that activate phospholipase A2. J Biol Chem 1994; 269:19480-7. [PMID: 8034717] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
Abstract
The activation of mitogen-activated protein kinase (MAP kinase) in macrophages and the involvement of protein kinase C (PKC) in MAP kinase activation was investigated in macrophages exposed to agents that have previously been shown to activate the 85-kDa cytosolic phospholipase A2 (PLA2) and induce arachidonic acid release. Phorbol 12-myristate 13-acetate (PMA) and zymosan maximally stimulated MAP kinase activity by 5 and 15 min, respectively, whereas the response to okadaic acid was maximal by 60-90 min. MAP kinase activation correlated with tyrosine phosphorylation of p44 MAP kinase in PMA-stimulated cells and p44 and p42 MAP kinases in zymosan- and okadaic acid-stimulated cells. MAP kinase activity was not elevated in A23187-stimulated macrophages. Inhibition of PKC with the inhibitor, bisindolylmaleimide (GF109203X), or by prolonged exposure to PMA suppressed both arachidonic acid release and MAP kinase activation in PMA- and zymosan-stimulated macrophages but not in okadaic acid or A23187-treated cells. However, prolonged exposure to PMA did not suppress the increased cytosolic PLA2 activity in agonist-treated macrophages. This approach was complicated since initial exposure to PMA to down-regulate PKC increased cytosolic PLA2 activity which remained elevated for 16 h. In contrast, GF109203X treatment suppressed the increase in cytosolic PLA2 activity in response to zymosan and PMA but not to okadaic acid or A23187. The results demonstrate that PMA and zymosan trigger PKC activation that leads to the activation of MAP kinase and PLA2, whereas these responses are PKC independent in okadaic acid-treated cells. In addition, the results are consistent with a role for MAP kinase activation in regulating the activation of the 85-kDa PLA2 and arachidonic acid release in PMA-, zymosan-, and okadaic acid-stimulated cells, whereas these responses in A23187-treated cells are MAP kinase-and PKC-independent.
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Affiliation(s)
- Z H Qiu
- Department of Pediatrics, National Jewish Center for Immunology and Respiratory Medicine, Denver, Colorado 80206
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Qiu ZH, de Carvalho MS, Leslie CC. Regulation of phospholipase A2 activation by phosphorylation in mouse peritoneal macrophages. J Biol Chem 1993; 268:24506-13. [PMID: 8227003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023] Open
Abstract
The regulation of phospholipase A2 (PLA2) activation by phosphorylation, and phosphorylation of an 85-kDa, arachidonoyl-hydrolyzing PLA2 was investigated in mouse peritoneal macrophages. Phorbol 12-myristate 13-acetate (PMA) and okadaic acid, an inhibitor of serine/threonine phosphatases, stimulated arachidonic acid release, supporting a role for phosphorylation events in regulating PLA2 activation. In response to zymosan, PMA, or A23187, arachidonic acid was released at a linear rate up to 30-45 min after stimulation, whereas there was a 30-min lag preceding arachidonic acid release in response to okadaic acid. The 85-kDa PLA2 was phosphorylated on serine in the macrophages, and the level of phosphorylation increased in response to zymosan, PMA, okadaic acid, and, to a lesser extent, A23187. Two-dimensional phosphopeptide mapping revealed multiple phosphopeptides, several of which showed increased phosphorylation in response to zymosan, okadaic acid, and PMA. Zymosan, PMA, A23187, or okadaic acid stimulated time-dependent increases in PLA2 activity in the cytosolic fraction. PLA2 activation was most rapid in response to PMA, whereas activation in response to okadaic acid was delayed similar to the time course of arachidonic acid release. The cytosolic PLA2 had characteristics of the 85-kDa enzyme, including kinetic properties and substrate preference. Phosphatase treatment of the cytosols dephosphorylated the 85-kDa PLA2 and reversed the increase in activity. The results provide evidence that phosphorylation of the 85-kDa PLA2, induced by stimuli that induce arachidonic acid release, is an important mechanism for activation of the enzyme in macrophages.
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Affiliation(s)
- Z H Qiu
- Department of Pediatrics, National Jewish Center for Immunology and Respiratory Medicine, Denver, Colorado 80206
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Singer B, Antoccia A, Basu AK, Dosanjh MK, Fraenkel-Conrat H, Gallagher PE, Kuśmierek JT, Qiu ZH, Rydberg B. Both purified human 1,N6-ethenoadenine-binding protein and purified human 3-methyladenine-DNA glycosylase act on 1,N6-ethenoadenine and 3-methyladenine. Proc Natl Acad Sci U S A 1992; 89:9386-90. [PMID: 1409645 PMCID: PMC50136 DOI: 10.1073/pnas.89.20.9386] [Citation(s) in RCA: 81] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
We previously described a protein, isolated from human tissues and cells, that bound to a defined double-stranded oligonucleotide containing a single site-specifically placed 1,N6-ethenoadenine. It was further demonstrated that this protein was a glycosylase and released 1,N6-ethenoadenine. We now find that this enzyme also releases 3-methyladenine from methylated DNA and that 3-methyladenine-DNA glycosylase behaves in the same manner, binding to the ethenoadenine-containing oligonucleotide and cleaving both ethenoadenine and 3-methyladenine from DNA containing these adducts. The rate and extent of glycosylase activities toward the two adducts are similar.
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Affiliation(s)
- B Singer
- Donner Laboratory, Life Sciences Division, Lawrence Berkeley Laboratory, University of California, Berkeley 94720
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Qiu ZH, Yu L, Yu CA. Spin-label electron paramagnetic resonance and differential scanning calorimetry studies of the interaction between mitochondrial cytochrome c oxidase and adenosine triphosphate synthase complex. Biochemistry 1992; 31:3297-302. [PMID: 1313290 DOI: 10.1021/bi00127a036] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
The interaction between cytochrome c oxidase complex and adenosine triphosphate synthase (F1F0) complex in the purified, dispersed state and embedded in phospholipid vesicles was studied by differential scanning calorimetry and by spin-label electron paramagnetic resonance. The detergent-dispersed cytochrome oxidase and F1F0 complexes undergo endothermic thermodenaturation. However, when these complexes are embedded in phospholipid vesicles, they undergo exothermic thermodenaturation. The energy released is believed to result from the collapse of a strained interaction between unsaturated fatty acyl groups of phospholipids and an exposed area of the complex formed by the removal of interacting proteins. The exothermic enthalpy change of thermodenaturation of a protein-phospholipid exothermic enthalpy change of thermodenaturation of a protein-phospholipid vesicle containing both cytochrome oxidase complex and F1F0 was smaller than that of a mixture of protein-phospholipid vesicles formed from each individual electron transfer complex. This suggests specific interaction between cytochrome oxidase complex and F1F0 in the membrane. Further evidence for interaction between these two complexes is provided by saturation transfer EPR studies in which the rotational correlation time of spin-labeled cytochrome oxidase increases significantly when the complex is mixed with F1F0 prior to being embedded in phospholipid vesicles. From these results, it is concluded that at least a part of cytochrome oxidase and a part of F1F0 form a supermacromolecular complex in the inner mitochondrial membrane. No such supermacromolecular complex is detected between F1F0 and ubiquinol--cytochrome c reductase.
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Affiliation(s)
- Z H Qiu
- Department of Biochemistry, Oklahoma State University, Stillwater 74078
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Rydberg B, Qiu ZH, Dosanjh MK, Singer B. Partial purification of a human DNA glycosylase acting on the cyclic carcinogen adduct 1,N6-ethenodeoxyadenosine. Cancer Res 1992; 52:1377-9. [PMID: 1737401] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
We previously reported that a variety of human cells and tissues contained a Mr35,000 DNA-binding protein which selectively recognized a single 1,N6-ethenoadenine in a defined 25-base double-stranded oligonucleotide (B. Rydberg et al., Proc. Natl. Acad. Sci. USA, 88: 6839-6842, 1991). We now demonstrate that incubation of the same duplex with 50-fold partially purified binding protein from human placenta results in release of the free 1,N6-ethenoadenine base, indicative of DNA glycosylase action. This enzyme activity appears unique in that it excises a cyclic adduct resulting from a known human carcinogen.
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Affiliation(s)
- B Rydberg
- Division of Cell and Molecular Biology, Donner Laboratory, Lawrence Berkeley Laboratory, University of California, Berkeley 94720
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Güner S, Robertson DE, Yu L, Qiu ZH, Yu CA, Knaff DB. The Rhodospirillum rubrum cytochrome bc1 complex: redox properties, inhibitor sensitivity and proton pumping. Biochim Biophys Acta 1991; 1058:269-79. [PMID: 1646633 DOI: 10.1016/s0005-2728(05)80247-6] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
A detergent-solubilized, three-subunit-containing cytochrome bc1 complex, isolated from the photosynthetic bacterium R. rubrum, has been shown to be highly sensitive to stigmatellin, myxothiazol, antimycin A and UHDBT, four specific inhibitors of these complexes. Oxidation-reduction titrations have allowed the determination of Em values for all the electron-carrying prosthetic groups in the complex. Antimycin A has been shown to produce a red shift in the alpha-band absorbance maximum of one of the cytochrome b hemes in the complex and stigmatellin has been shown to alter both the Em and EPR g-values of the Rieske iron-sulfur protein in the complex. Western blots have revealed antigenic similarities between the cytochrome subunits of the R. rubrum complex and those of the related photosynthetic bacteria, Rb. capsulatus and Rb. sphaeroides. The R. rubrum complex has been incorporated into liposomes. These liposomes exhibit respiratory control and are able to couple electron transfer from quinol to cytochrome c to proton translocation across the liposome membrane in a manner consistent with a Q-cycle mechanism. It can thus be concluded that neither electron transport nor coupled proton translocation by the cytochrome bc1 complex requires more than three subunits in R. rubrum.
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Affiliation(s)
- S Güner
- Department of Chemistry and Biochemistry, Texas Tech University, Lubbock 79409-1061
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Qiu ZH, Lin QS. Spectra properties of rat liver mitochondrial choline dehydrogenase. Sci China B 1990; 33:955-63. [PMID: 2242219] [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: 12/30/2022]
Abstract
Choline dehydrogenase contains the prosthetic group FAD, non-haem iron and acid labile sulfur. However, the absorption spectra of the purified enzyme do not change after adding substrate. The reduced absorption spectra of choline dehydrogenase can only be determined after the addition of dithionite. Those choline dehydrogenases situated in the mitochondrial inner membrane can be reduced by substrate and exist in the reduced state. When cholate was used to solubilize the substrate-reduced choline dehydrogenase, the reduced spectra will gradually disappear. However, if solubilization is carried out under anaerobic conditions, the reduced spectra can be retained, suggesting that the solubilized choline dehydrogenase can use oxygen as an acceptor.
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Affiliation(s)
- Z H Qiu
- Shanghai Institute of Biochemistry, Academia Sinica, PRC
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