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Yang HC, He JX, Yang Y, Han Z, Zhang B, Zhou S, Wu T, Qiao Q, He XL, Wang N. [Propensity score matching analysis of the short-term efficacy of Kamikawa versus double- tract reconstruction in laparoscopic proximal gastric cancer surgery]. Zhonghua Wei Chang Wai Ke Za Zhi 2024; 27:261-267. [PMID: 38532588 DOI: 10.3760/cma.j.cn441530-20230809-00040] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Subscribe] [Scholar Register] [Indexed: 03/28/2024]
Abstract
Objective: To compare the short-term efficacy of Kamikawa anastomosis and double-tract reconstruction (DTR) after proximal gastrectomy. Methods: This was a propensity score matched, retrospective, cohort study. Inclusion criteria comprised age 20-70 years, diagnosis of gastric cancer by pathological examination of preoperative endoscopic biopsies, tumor diameter ≤4 cm, and location in the upper 1/3 of the stomach (including the gastroesophageal junction), and TNM stage IA, IB, or IIA. The study cohort comprised 73 patients who had undergone laparoscopic proximal gastric cancer radical surgery in the Department of Gastroenterology, Tangdu Hospital, Air Force Medical University between June 2020 and February 2023, 19 of whom were in the Kamikawa group and 54 in the DTR group. After using R language to match the baseline characteristics of patients in a ratio of 1:2, there were 17 patients in the Kamikawa group and 34 in the DTR group. Surgery-related conditions, postoperative quality of life, and postoperative complications were compared between the two groups. Results: After propensity score matching, there were no statistically significant differences in baseline data between the two groups (P>0.05). Compared with the DTR group, the Kamikawa group had longer operative times (321.5±15.7 minutes vs. 296.8±26.1 minutes, t=32.056, P<0.001), longer anastomosis times (93.0±6.8 minutes vs. 45.3±7.7 minutes, t=56.303, P<0.001), and less bleeding (76 [54~103] mL vs.112 [82~148) mL, Z=71.536, P<0.001); these differences are statistically significant. There were no statistically significant differences between the two groups in tumor size, time to first postoperative passage of gas, postoperative hospital stay, number of lymph nodes removed, duration of lymph node dissection, or total hospitalization cost (all P>0.05). The median follow-up time was 6.1 ± 1.8 months. As to postoperative quality of life, the Kamikawa group had a lower rate of upper gastrointestinal contrast reflux than did the DTR group (0 vs. 29.4% [10/34], χ2=6.220, P=0.013); this difference is statistically significant. However, differences between the two groups in quality of life score on follow-up of 3 months and 6 months on the Gastroesophageal Reflux Disease (GERD) scale were not statistically significant (all P>0.05). The incidence of postoperative complications was 2/17 in the Kamikawa group, which is significantly lower than the 41.2% (14/34) in the DTR group (χ2=4.554, P=0.033). Conclusion: Kamikawa anastomosis and DTR are equally safe and effective procedures for reconstructing the digestive tract after proximal gastric surgery. Although Kamikawa anastomosis takes slightly longer and places higher demands on the surgical team, it is more effective at preventing postoperative reflux.
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Affiliation(s)
- H C Yang
- Department of General Surgery, Tangdu Hospital, Air Force Medical University, Xi'an 710038, China
| | - J X He
- Department of General Surgery, Tangdu Hospital, Air Force Medical University, Xi'an 710038, China
| | - Y Yang
- Department of General Surgery, Tangdu Hospital, Air Force Medical University, Xi'an 710038, China
| | - Z Han
- Department of General Surgery, Tangdu Hospital, Air Force Medical University, Xi'an 710038, China
| | - B Zhang
- Department of General Surgery, Tangdu Hospital, Air Force Medical University, Xi'an 710038, China
| | - S Zhou
- Department of General Surgery, Tangdu Hospital, Air Force Medical University, Xi'an 710038, China
| | - T Wu
- Department of General Surgery, Tangdu Hospital, Air Force Medical University, Xi'an 710038, China
| | - Q Qiao
- Department of General Surgery, Tangdu Hospital, Air Force Medical University, Xi'an 710038, China
| | - X L He
- Department of General Surgery, Tangdu Hospital, Air Force Medical University, Xi'an 710038, China
| | - N Wang
- Department of General Surgery, Tangdu Hospital, Air Force Medical University, Xi'an 710038, China
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Ali S, Ouyang PH, He JX, Chai YQ, Wei LF. Author Correction: Josephson radiation threshold detector. Sci Rep 2024; 14:5925. [PMID: 38467708 PMCID: PMC10928177 DOI: 10.1038/s41598-024-56375-w] [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] [Indexed: 03/13/2024] Open
Affiliation(s)
- Soragga Ali
- Information Quantum Technology Laboratory, International Cooperation Research Center of China Communication and Sensor Networks for Modern Transportation, School of Information Science and Technology, Southwest Jiaotong University, Chengdu, 610031, China
| | - P H Ouyang
- Information Quantum Technology Laboratory, International Cooperation Research Center of China Communication and Sensor Networks for Modern Transportation, School of Information Science and Technology, Southwest Jiaotong University, Chengdu, 610031, China
| | - J X He
- Information Quantum Technology Laboratory, International Cooperation Research Center of China Communication and Sensor Networks for Modern Transportation, School of Information Science and Technology, Southwest Jiaotong University, Chengdu, 610031, China
| | - Y Q Chai
- Information Quantum Technology Laboratory, International Cooperation Research Center of China Communication and Sensor Networks for Modern Transportation, School of Information Science and Technology, Southwest Jiaotong University, Chengdu, 610031, China
| | - L F Wei
- Information Quantum Technology Laboratory, International Cooperation Research Center of China Communication and Sensor Networks for Modern Transportation, School of Information Science and Technology, Southwest Jiaotong University, Chengdu, 610031, China.
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Ali S, Ouyang PH, He JX, Chai YQ, Wei LF. Josephson radiation threshold detector. Sci Rep 2024; 14:2531. [PMID: 38291128 PMCID: PMC10827805 DOI: 10.1038/s41598-024-52684-2] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2023] [Accepted: 01/19/2024] [Indexed: 02/01/2024] Open
Abstract
A Josephson radiation threshold detector (JRTD) that is based on the threshold behaviour of a current bias Josephson junction (CBJJ) is designed and fabricated for infrared radiation (IR@1550nm) detection at low temperatures. To achieve the optimal performance, we develop a binary hypothesis detection method to calibrate Josephson threshold behaviours (i.e. the switching current distributions of the CBJJ with the Al/AlOx/Al junction) in the absence and presence of radiation. In the absence of IR radiation, the junction transitioned with a measurable voltage drop across the junction, and this signal was treated as the events of hypothesis H0. The events of junction transition observed in the presence of the IR radiation served as hypothesis H1. Considering the usual Gaussian noise and based on statistical decision theory, the accumulated data of the measured switching current distributions are processed, and the threshold sensitivity of the demonstrated JRTD device is estimated. The minimum detectable IR radiation power of the proposed detector is approximately 0.74 pW, which corresponds to the photon rate of 5.692 × 106 photons/second. Further optimisation of JRTDs to implement the desired binary detection of a single photon is still a subject of argument, at least theoretically.
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Affiliation(s)
- Soragga Ali
- Information Quantum Technology Laboratory, International Cooperation Research Center of China Communication and Sensor Networks for Modern Transportation, School of Information Science and Technology, Southwest Jiaotong University, Chengdu, 610031, China
| | - P H Ouyang
- Information Quantum Technology Laboratory, International Cooperation Research Center of China Communication and Sensor Networks for Modern Transportation, School of Information Science and Technology, Southwest Jiaotong University, Chengdu, 610031, China
| | - J X He
- Information Quantum Technology Laboratory, International Cooperation Research Center of China Communication and Sensor Networks for Modern Transportation, School of Information Science and Technology, Southwest Jiaotong University, Chengdu, 610031, China
| | - Y Q Chai
- Information Quantum Technology Laboratory, International Cooperation Research Center of China Communication and Sensor Networks for Modern Transportation, School of Information Science and Technology, Southwest Jiaotong University, Chengdu, 610031, China
| | - L F Wei
- Information Quantum Technology Laboratory, International Cooperation Research Center of China Communication and Sensor Networks for Modern Transportation, School of Information Science and Technology, Southwest Jiaotong University, Chengdu, 610031, China.
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Lin L, Xie B, Shi J, Zhou CM, Yi J, Chen J, He JX, Wei HL. [IL-8 Links NF-κB and Wnt/β-Catenin Pathways in Persistent Inflammatory Response Induced by Chronic Helicobacter pylori Infection]. Mol Biol (Mosk) 2023; 57:713-716. [PMID: 37528793 DOI: 10.31857/s0026898423040134, edn: qlukej] [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] [Received: 08/03/2022] [Accepted: 02/03/2023] [Indexed: 08/03/2023]
Abstract
Helicobacter pylori (H. pylori) infection can cause persistent inflammatory response in human gastric mucosal epithelial cells, which may result in the occurrence of cancer. However, the underlying mechanism of carcinogenesis has not been elucidated yet. Herein, we established the models of chronic H. pylori infection in GES-1 cells and C57BL/6J mice. Interleukin 8 (IL-8) level was detected by ELISA. The expression of NF-κB p65, IL-8, Wnt2 and β-catenin mRNA and proteins was evaluated by real-time PCR, Western blotting, immunofluorescence staining, and immunohistochemistry. The infection of H. pylori in mice was evaluated by rapid urease test, H&E staining and Warthin-Starry silver staining. The morphological changes of gastric mucosa were observed by electron microscopy. Our results showed that in H. pylori infected gastric mucosal cells along with activation of NF-κB signaling pathway and increase of IL-8 level, the expression of Wnt2 was also increased significantly, which preliminarily indicates that IL-8 can positively regulate the expression of Wnt2. Studies in chronic H. pylori infected C57BL/6J mice models showed that there was an increased incidence of premalignant lesions in the gastric mucosa tissue. Through comparing changes of gastric mucosal cell ultrastructure and analyzing the relationship between NF-κB signaling pathway and Wnt2 expression, we found that H. pylori infection activated NF-κB signal pathways, and the massive release of IL-8 was positively correlated with the high expression of Wnt2 protein. Subsequently, the activated Wnt/β-catenin signal pathways may be involved in the malignant transformation of gastric mucosal cells. Collectively, H. pylori chronic infection may continuously lead to persistent inflammatory response: activate NF-κB pathway, promote IL-8 release and thereby activate Wnt/β-catenin pathway. IL-8 probably plays an important role of a linker in coupling these two signal pathways.
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Affiliation(s)
- L Lin
- Department of Hematology and Oncology, Gansu Provincial Maternity and Child-Care Hospital, Lanzhou, Gansu, 730050 China
| | - B Xie
- Key Laboratory of Preclinical Study for New Drugs of Gansu Province, School of Basic Medical Sciences, Lanzhou University, Lanzhou, Gansu, 730000 China
| | - J Shi
- Department of Blood Transfusion, The Second Hospital of Lanzhou University, Lanzhou, Gansu, 730000 China
| | - C M Zhou
- Department of Clinical Laboratory Center, The First Hospital of Lanzhou University, Lanzhou, Gansu, 730000 China
| | - J Yi
- Key Laboratory of Preclinical Study for New Drugs of Gansu Province, School of Basic Medical Sciences, Lanzhou University, Lanzhou, Gansu, 730000 China
| | - J Chen
- Key Laboratory of Preclinical Study for New Drugs of Gansu Province, School of Basic Medical Sciences, Lanzhou University, Lanzhou, Gansu, 730000 China
| | - J X He
- Basic Medical College, Gansu University of Chinese Medicine, Lanzhou, Gansu, 730000 China
| | - H L Wei
- Key Laboratory of Preclinical Study for New Drugs of Gansu Province, School of Basic Medical Sciences, Lanzhou University, Lanzhou, Gansu, 730000 China
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Wei MG, Zhou S, Zhang B, Yang Y, Wang K, Gao P, He JX, Wu T, Wang N, He XL. [Overlap esophagojejunostomy with multi-mode modifications in totally laparoscopic total gastrectomy: safety and feasibility of 152 cases from a single center]. Zhonghua Wei Chang Wai Ke Za Zhi 2022; 25:433-439. [PMID: 35599398 DOI: 10.3760/cma.j.cn441530-20220309-00098] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Objective: Currently, the Overlap anastomosis is one of the most favored reconstruction methods of intracorporeal esophagojejunostomy (EJS). Despite many advantages of the method, it remains some shortcomings to be improved when it comes to the retraction of the esophagus stump, the insertion of the anvil fork of the linear stapler into a "pseudo" lumen, and the closure of the common entry hole. This study aims to investigate the safety and feasibility of a multi-mode modified Overlap anastomosis. Methods: A descriptive case series study was conducted. Medical records of 152 consecutive patients who underwent totally laparoscopic total gastrectomy (TLTG) with our multi-mode modified Overlap EJS method by the same surgical team at our department from February 2017 to June 2020 were retrospectively analyzed. The multi-mode modified Overlap method mainly included (1) After ensuring the safety of tumor resection margin (proximal margin was at least 3 cm from the tumor), the esophagus was partially transected from left to right (with 5-8 mm width esophagus continuation). The specimen was then placed in a plastic bag which was tied up at the mouth using strings with a part of the esophageal wall poking through. Then the plastic bag containing the specimen was transferred to the right lumbar region, while the patient's body position was adjusted so that the abdominal esophagus could be pulled by the gravity of the specimen. (2) Using the "three-direction traction" method. The esophageal lumen was properly exposed, then guided by the gastric tube, the anvil fork was accurately placed into the esophageal lumen for completing the side-to-side EJS. (3) The 3-0 barbed suture was used in the closure of the common entry hole of the stapler from dorsally to ventrally with simple one-layer continuous suture (the stitch going from inside to inside) followed by continuous Lembert's suture (the stitch going from outside to outside). Combined with clinicopathological characteristics, the perioperative outcomes and postoperative complications of the whole group were analyzed and evaluated. Results: The study cohort included 129 men and 23 women, with a mean age of (60.2±9.1) years and a mean body mass index (BMI) of (23.2±3.1) kg/m(2). Of the 152 patients, 23 patients (15.1%) had a history of previous abdominal surgery; dentate line was invaded by tumor in 21 patients (13.8%). The mean length of the proximal resection margin was (3.3±0.3) cm and the postoperative pathological examination indicated negative resection margin tumor. The mean operative time and anastomotic time were (302.1±39.9) minutes and (29.8±5.4) minutes, respectively. The mean estimated blood loss was (87.9±46.4) ml. The mean length of postoperative hospital stay was (12.3±7.3) days. The overall severe postoperative complications (Clavien-Dindo ≥ II) occurred in 22 patients (14.5%). Six cases of pancreatic leakage were successfully recovered by adequate drainage, inhibition of pancreatic exocrine secretion and nutritional support. Ten cases of pneumonia and three cases of abdominal infection were cured with anti-infection and physical therapy. Two patients developed anastomotic leakage postoperatively. One case was caused by excessive tension of the Roux loop of the jejunum and excessive opening on the side of the jejunum after side-to-side anastomosis, and the other case was caused by an accidental intraoperative occurrence of "nasogastric tube stapled to the side-to-side anastomosis". Both of them recovered after conservative treatment including adequate drainage, anti-infection, and adequate nutritional support. One patient underwent immediate open surgery because of Peterson's hernia 7 days after TLTG, and the patient died due to extensive small bowel necrosis. Conclusions: Multi-mode modified overlap method simplifies the operation and reduces the difficulty of EJS. It is a safe and feasible method for EJS.
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Affiliation(s)
- M G Wei
- Department of General Surgery, The Second Affiliated Hospital, Air Force Medical University, Xi'an 710038, China
| | - S Zhou
- Department of General Surgery, The Second Affiliated Hospital, Air Force Medical University, Xi'an 710038, China
| | - B Zhang
- Department of General Surgery, The Second Affiliated Hospital, Air Force Medical University, Xi'an 710038, China
| | - Y Yang
- Department of General Surgery, The Second Affiliated Hospital, Air Force Medical University, Xi'an 710038, China
| | - K Wang
- Department of General Surgery, The Second Affiliated Hospital, Air Force Medical University, Xi'an 710038, China
| | - P Gao
- Department of General Surgery, The Second Affiliated Hospital, Air Force Medical University, Xi'an 710038, China
| | - J X He
- Department of General Surgery, The Second Affiliated Hospital, Air Force Medical University, Xi'an 710038, China
| | - T Wu
- Department of General Surgery, The Second Affiliated Hospital, Air Force Medical University, Xi'an 710038, China
| | - N Wang
- Department of General Surgery, The Second Affiliated Hospital, Air Force Medical University, Xi'an 710038, China
| | - X L He
- Department of General Surgery, The Second Affiliated Hospital, Air Force Medical University, Xi'an 710038, China
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Fan XS, Shen LL, Hu R, He JX, Li YT, Yuan H. [Research progress on the correlation between small dense low-density lipoprotein-cholesterol and atherosclerotic cardiovascular disease]. Zhonghua Yu Fang Yi Xue Za Zhi 2021; 55:1507-1512. [PMID: 34963252 DOI: 10.3760/cma.j.cn112150-20210817-00801] [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: 06/14/2023]
Abstract
Atherosclerotic cardiovascular disease (ASCVD), a series of cardiovascular diseases based on atherosclerosis, has attracted more clinical attention. However, with the increase of population-based research results, the diagnostic value of traditional blood lipid parameters such as low density lipoprotein-cholesterol (LDL-C) is showing limitations. In recent years, a large number of studies have confirmed that small dense low-density lipoprotein cholesterol (sdLDL-C) has lower affinity with low-density lipoprotein receptor, longer circulation time and easier to penetrate arterial endothelium, so it has stronger atherogenic effect. Therefore, we summarize the common detection methods of sdLDL-C, the research progress of the correlation between sdLDL-C and ASCVD risk, as well as the intervention measures and influencing factors of sdLDL-C level, in order to deepen the clinician's understanding of the role of sdLDL-C in ASCVD and achieve the early prevention, early detection and early diagnosis of chronic atherosclerosis.
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Affiliation(s)
- X S Fan
- Department of Clinical Laboratory, Beijing Anzhen Hospital, Beijing 100029, China
| | - L L Shen
- Graduate School, Capital Medical University, Beijing 100069, China
| | - R Hu
- Department of Clinical Laboratory, Beijing Anzhen Hospital, Beijing 100029, China
| | - J X He
- Department of Clinical Laboratory, Beijing Anzhen Hospital, Beijing 100029, China
| | - Y T Li
- Department of Laboratory Medicine, Capital Medical University, Beijing 100069, China
| | - H Yuan
- Department of Clinical Laboratory, Beijing Anzhen Hospital, Beijing 100029, China
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Chen LQ, Liu J, Yao Y, Yin J, He JX, Xu BP. [Two Chinese cases with STAT1 gene gain-of-function variation]. Zhonghua Er Ke Za Zhi 2021; 59:700-702. [PMID: 34333925 DOI: 10.3760/cma.j.cn112140-20210119-00061] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- L Q Chen
- China National Clinical Research Center for Respiratory Diseases, Department of Resiratory Diseases, Beijing Children's Hospital, Capital Medical University, National Center for Children's Health, Beijing 100045, China
| | - J Liu
- China National Clinical Research Center for Respiratory Diseases, Department of Resiratory Diseases, Beijing Children's Hospital, Capital Medical University, National Center for Children's Health, Beijing 100045, China
| | - Y Yao
- China National Clinical Research Center for Respiratory Diseases, Department of Resiratory Diseases, Beijing Children's Hospital, Capital Medical University, National Center for Children's Health, Beijing 100045, China
| | - J Yin
- China National Clinical Research Center for Respiratory Diseases, Department of Resiratory Diseases, Beijing Children's Hospital, Capital Medical University, National Center for Children's Health, Beijing 100045, China
| | - J X He
- China National Clinical Research Center for Respiratory Diseases, Department of Resiratory Diseases, Beijing Children's Hospital, Capital Medical University, National Center for Children's Health, Beijing 100045, China
| | - B P Xu
- China National Clinical Research Center for Respiratory Diseases, Department of Resiratory Diseases, Beijing Children's Hospital, Capital Medical University, National Center for Children's Health, Beijing 100045, China
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Hu LH, Xu X, Shen WY, Qi Y, Tian H, He JX. [Application of thoracoscopy-guided thoracic paravertebral block for analgesia after single-port video-assisted pulmonary lobectomy]. Zhonghua Yi Xue Za Zhi 2020; 100:2596-2600. [PMID: 32892605 DOI: 10.3760/cma.j.cn112137-20200525-01647] [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] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Objective: To investigate the effects of thoracoscopy-guided thoracic paravertebral block for analgesia after single-port video-assisted pulmonary lobectomy. Methods: From December 2019 to April 2020, 60 patients receiving single-port video-assisted pulmonary lobectomy at Ningbo Medical Center Lihuili Hospital were selected. The patients were randomly and equally divided into control group and paravertebral block group using a random number table. Patients of paravertebral block group were injected into the thoracic 4-5 intercostal, paravertebral 1 cm using 0.375% ropivacaine (20 ml) with thoracoscopy-guided at the end of surgery, while patients of control group were given patient controlled intravenous analgesia (PCIA). Postoperative visual analogue scale (VAS) and Ramsay sedation scale were recorded at 6, 12, 24, 36, 48 h after the surgery. The incidence of postoperative adverse reactions, additional dose and times of pethidine, the time to resume eating, the rate of postoperative active cough, the first time to get out of bed after surgery and postoperative hospital stay of two groups' patients were recorded. t test and chisquare test were used for statistical analysis. Results: The VAS score of paravertebral block group were lower than those of control group at all time points (all P<0.05). The Ramsay sedation scale of paravertebral block group were higher than those of control group at all time points (all P<0.05). The additional dose and times of pethidine of paravertebral block group were (8.2±2.3) mg and (0.2±0.1) time, which were lower than (87.8±15.3) mg and (1.8±0.3) time of control group, the differences were statistically significant (t=28.91, 34.37, all P<0.05). Incidence of nausea, vomiting and pruritus of paravertebral block group were 10.0%, 6.7% and 0, which were lower than 40.0%, 30.0% and 13.3% of control group, the differences were statistically significant (χ(2)=7.20, 5.45, 4.29, all P<0.05). The rate of postoperative active cough of paravertebral block group was 33.3%, which was higher than 10.0% of control group, the difference was statistically significant (χ(2)=4.81, P<0.05). The time to resume eating, the first time to get out of bed after surgery and postoperative hospital stay were (6.5±0.4) h, (20.9±3.1) h and (4.6±1.0) d, which were lower than (8.5±0.7) h, (28.6±4.8) h and (6.1±1.3) d of control group, the differences were statistically significant (t=13.47, 7.39, 4.19, all P<0.05). Conclusion: Thoracic paravertebral block under thoracoscopy-guided can effectively reduce the postoperative pain of single-port thoracoscopic lobectomy, with fewer adverse reactions, and is beneficial to postoperative recovery.
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Affiliation(s)
- L H Hu
- Department of Anesthesiology, Ningbo Medical Center Lihuili Hospital, Ningbo 315040, China
| | - X Xu
- Department of Anesthesiology, Ningbo Medical Center Lihuili Hospital, Ningbo 315040, China
| | - W Y Shen
- Department of Thoracic Surgery, Ningbo Medical Center Lihuili Hospital, Ningbo 315040, China
| | - Y Qi
- Department of Anesthesiology, Ningbo Medical Center Lihuili Hospital, Ningbo 315040, China
| | - H Tian
- Department of Thoracic Surgery, Ningbo Medical Center Lihuili Hospital, Ningbo 315040, China
| | - J X He
- Department of Thoracic Surgery, Ningbo Medical Center Lihuili Hospital, Ningbo 315040, China
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He JX, Le Mai Hoang K, Kho SH, Guo Z, Zhong W, Venkata Thappeta KR, Zamudio-Vázquez R, Hoo SN, Xiong Q, Duan H, Yang L, Chan-Park MB, Liu XW. Synthetic biohybrid peptidoglycan oligomers enable pan-bacteria-specific labeling and imaging: in vitro and in vivo. Chem Sci 2020; 11:3171-3179. [PMID: 34122822 PMCID: PMC8157403 DOI: 10.1039/c9sc06345e] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [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: 11/21/2022] Open
Abstract
Peptidoglycan is the core component of the bacterial cell wall, which makes it an attractive target for the development of bacterial targeting agents. Intercepting its enzymatic assembly with synthetic substrates allows for labeling and engineering of live bacterial cells. Over the past two decades, small-molecule-based labeling agents, such as antibiotics, d-amino acids or monosaccharides have been developed for probing biological processes in bacteria. Herein, peptidoglycan oligomers, substrates for transglycosylation, are prepared for the first time using a top-down approach, which starts from chitosan as a cheap feedstock. A high efficiency of labeling has been observed in all bacterial strains tested using micromolar substrates. In contrast, uptake into mammalian cells was barely observable. Additional mechanistic studies support a hypothesis of bacteria-specific metabolic labeling rather than non-specific binding to the bacterial surface. Eventually, its practicality in bacterial targeting capability is demonstrated in resistant strain detection and in vivo infection models.
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Affiliation(s)
- Jing-Xi He
- School of Physical and Mathematical Sciences, Nanyang Technological University 21 Nanyang Link Singapore 637371 Singapore .,School of Chemical and Biomedical Engineering, Nanyang Technological University 62 Nanyang Drive Singapore 637459 Singapore
| | - Kim Le Mai Hoang
- School of Physical and Mathematical Sciences, Nanyang Technological University 21 Nanyang Link Singapore 637371 Singapore
| | - Shu Hui Kho
- School of Physical and Mathematical Sciences, Nanyang Technological University 21 Nanyang Link Singapore 637371 Singapore .,NTU Institute for Health Technologies, Nanyang Technological University Singapore
| | - Zhong Guo
- School of Physical and Mathematical Sciences, Nanyang Technological University 21 Nanyang Link Singapore 637371 Singapore
| | - Wenbin Zhong
- School of Chemical and Biomedical Engineering, Nanyang Technological University 62 Nanyang Drive Singapore 637459 Singapore
| | - Kishore Reddy Venkata Thappeta
- School of Chemical and Biomedical Engineering, Nanyang Technological University 62 Nanyang Drive Singapore 637459 Singapore
| | - Rubí Zamudio-Vázquez
- School of Chemical and Biomedical Engineering, Nanyang Technological University 62 Nanyang Drive Singapore 637459 Singapore
| | - Sin Ni Hoo
- School of Physical and Mathematical Sciences, Nanyang Technological University 21 Nanyang Link Singapore 637371 Singapore
| | - Qirong Xiong
- School of Chemical and Biomedical Engineering, Nanyang Technological University 62 Nanyang Drive Singapore 637459 Singapore
| | - Hongwei Duan
- School of Chemical and Biomedical Engineering, Nanyang Technological University 62 Nanyang Drive Singapore 637459 Singapore
| | - Liang Yang
- School of Medicine, Southern University of Science and Technology Shenzhen 518055 China
| | - Mary B Chan-Park
- School of Chemical and Biomedical Engineering, Nanyang Technological University 62 Nanyang Drive Singapore 637459 Singapore
| | - Xue-Wei Liu
- School of Physical and Mathematical Sciences, Nanyang Technological University 21 Nanyang Link Singapore 637371 Singapore
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Báti G, He JX, Pal KB, Liu XW. Stereo- and regioselective glycosylation with protection-less sugar derivatives: an alluring strategy to access glycans and natural products. Chem Soc Rev 2019; 48:4006-4018. [DOI: 10.1039/c8cs00905h] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
This review delivers insights for dedicated chemists into the development of efficient methods in accessing carbohydrates at a lower cost.
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Affiliation(s)
- Gábor Báti
- Division of Chemistry and Biological Chemistry
- School of Physical and Mathematical Sciences
- Nanyang Technological University
- Singapore
| | - Jing-Xi He
- Division of Chemistry and Biological Chemistry
- School of Physical and Mathematical Sciences
- Nanyang Technological University
- Singapore
- School of Chemical and Biomedical Engineering
| | - Kumar Bhaskar Pal
- Division of Chemistry and Biological Chemistry
- School of Physical and Mathematical Sciences
- Nanyang Technological University
- Singapore
| | - Xue-Wei Liu
- Division of Chemistry and Biological Chemistry
- School of Physical and Mathematical Sciences
- Nanyang Technological University
- Singapore
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11
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Wang ZY, He JX, Xu ZG, Xu Z, Ma L. Cutaneous granuloma caused by Rhizopus oryzae with a novel mutation in the CYBB gene in a monozygotic male twin. J Eur Acad Dermatol Venereol 2018; 32:e184-e185. [PMID: 29178191 DOI: 10.1111/jdv.14711] [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] [Indexed: 11/29/2022]
Affiliation(s)
- Z Y Wang
- Department of Dermatology, Beijing Children's Hospital, Capital Medical University, National Center for Children's Health, 10045, Beijing, China
| | - J X He
- Department of Respiratory Medicine, Beijing Children's Hospital, Capital Medical University, National Center for Children's Health, 10045, Beijing, China
| | - Z G Xu
- Department of Dermatology, Beijing Children's Hospital, Capital Medical University, National Center for Children's Health, 10045, Beijing, China
| | - Z Xu
- Department of Dermatology, Beijing Children's Hospital, Capital Medical University, National Center for Children's Health, 10045, Beijing, China
| | - L Ma
- Department of Dermatology, Beijing Children's Hospital, Capital Medical University, National Center for Children's Health, 10045, Beijing, China
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12
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Abstract
Glycans are complex compounds consisting of sugars linked glycosidically, existing either as pure polysaccharides or as part of glycoconjugates. They are prevalent in nature and possess important functions in regulating biological pathways. However, their diversity coupled with physiochemical similarities makes it challenging to isolate them in large quantities for biochemical studies, hence hampering progress in glycobiology and glycomedicine. Glycochemistry presents an alternative strategy to obtain pure glycan compounds through artificial synthetic methods. Efforts in glycochemistry have been centered on glycosylation, the key reaction in glycochemistry, especially with regards to anomeric stereoselectivity in polysaccharides and glycoconjugates. In particular, the stereoelectronic and steric properties of glycosyl donors are commonly used to direct the stereoselectivity in glycosylation reactions. Classic glycosylation strategies typically involve saturated glycosyl donors, proceeding either directly using hydrogen bonds and conformational constraints or indirectly by installing moieties covalently through neighboring group participation and intramolecular aglycon delivery. Over the past years, new glycosylation strategies, tapping on the foundations of transition metal catalysis, have emerged. To leverage the power of coordination chemistry, unsaturated glycosyl donors were introduced. Not only are the number of protection/deprotection steps reduced, the resultant unsaturated glycoside provides opportunities for downstream functionalizations, allowing quick access to a variety of sugars, including rare sugars. Alongside the glycosyl donor, an equally important but neglected aspect for targeting stereoselective glycosylation is the glycosyl acceptor. In the case of dual-directing donors, glycosyl acceptors have proved themselves capable of becoming the dominating factor for stereocontrol. Interestingly, rational manipulation or selection of glycosyl acceptors with particular nucleophilicity and p Ka values can lead to different stereoselectivities, thereby proving the tunability of such acceptors to favor the formation of one anomer over the other stereoselectively. By further venturing beyond substrate controlled stereoselectivity, we are presented with the opportunity to effect stereoselective glycosylation through glycosylating reagents. Of the key reagents, stereoselective catalyst stands out as a greener and efficient alternative to direct stereoselective control with stoichiometric substrates. Recently, investigations into this approach of stereocontrol presented an intriguing range of stereoselectivities, achieved by merely varying the nature of catalysts used. Another crucial effort in glycochemistry is enhancing the efficiencies of glycosylations, by reducing the number of preparative steps before or during glycosylation. Through using transient masking groups or one-pot synthetic strategies, these streamlined approaches provide enormous convenience and practicability for oligosaccharide syntheses. This Account presents mainly our advancements beyond the conventional donor-controlled strategies over the past decade, with emphasis placed on mechanistic explanations of anomeric selectivities, thereby providing perspectives to inspire further progress toward a generalized unified strategy for preparing every type of glycan.
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Affiliation(s)
- Wei-Lin Leng
- School of Physical & Mathematical Sciences, Division of Chemistry and Biological Chemistry, Nanyang Technological University, 21 Nanyang Link, 637371 Singapore
| | - Hui Yao
- School of Physical & Mathematical Sciences, Division of Chemistry and Biological Chemistry, Nanyang Technological University, 21 Nanyang Link, 637371 Singapore
| | - Jing-Xi He
- School of Physical & Mathematical Sciences, Division of Chemistry and Biological Chemistry, Nanyang Technological University, 21 Nanyang Link, 637371 Singapore
- School of Chemical and Biomedical Engineering, Nanyang Technological University, 62 Nanyang Drive, 637459 Singapore
| | - Xue-Wei Liu
- School of Physical & Mathematical Sciences, Division of Chemistry and Biological Chemistry, Nanyang Technological University, 21 Nanyang Link, 637371 Singapore
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13
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Le Mai Hoang K, He JX, Báti G, Chan-Park MB, Liu XW. A minimalist approach to stereoselective glycosylation with unprotected donors. Nat Commun 2017; 8:1146. [PMID: 29079775 PMCID: PMC5660076 DOI: 10.1038/s41467-017-01073-7] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [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] [Received: 04/21/2017] [Accepted: 08/16/2017] [Indexed: 12/30/2022] Open
Abstract
Mechanistic study of carbohydrate interactions in biological systems calls for the chemical synthesis of these complex structures. Owing to the specific stereo-configuration at each anomeric linkage and diversity in branching, significant breakthroughs in recent years have focused on either stereoselective glycosylation methods or facile assembly of glycan chains. Here, we introduce the unification approach that offers both stereoselective glycosidic bond formation and removal of protection/deprotection steps required for further elongation. Using dialkylboryl triflate as an in situ masking reagent, a wide array of glycosyl donors carrying one to three unprotected hydroxyl groups reacts with various glycosyl acceptors to furnish the desired products with good control over regioselectivity and stereoselectivity. This approach demonstrates the feasibility of straightforward access to important structural scaffolds for complex glycoconjugate synthesis. Oligosaccharide synthesis is encumbered by multiple protection and deprotection steps. Here, the authors report a protection-free yet stereoselective and regioselective glycosylation strategy using boron-masked glycosyl donors, and demonstrate efficient synthesis of oligosaccharides over a wide substrate scope.
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Affiliation(s)
- Kim Le Mai Hoang
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore, 637371, Singapore
| | - Jing-Xi He
- School of Chemical and Biomedical Engineering, Nanyang Technological University, 62 Nanyang Drive, Singapore, 637459, Singapore
| | - Gábor Báti
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore, 637371, Singapore
| | - Mary B Chan-Park
- School of Chemical and Biomedical Engineering, Nanyang Technological University, 62 Nanyang Drive, Singapore, 637459, Singapore.
| | - Xue-Wei Liu
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore, 637371, Singapore.
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14
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He JX, Jiang YF. [The progress and prospect of application of genetic testing technology-based gene detection technology in the diagnosis and treatment of hereditary cancer]. Zhonghua Yu Fang Yi Xue Za Zhi 2017; 51:772-776. [PMID: 28763932 DOI: 10.3760/cma.j.issn.0253-9624.2017.08.022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Hereditary cancer is caused by specific pathogenic gene mutations. Early detection and early intervention are the most effective ways to prevent and control hereditary cancer. High-throughput sequencing based genetic testing technology (NGS) breaks through the restrictions of pedigree analysis, provide a convenient and efficient method to detect and diagnose hereditary cancer. Here, we introduce the mechanism of hereditary cancer, summarize, discuss and prospect the application of NGS and other genetic tests in the diagnosis of hereditary retinoblastoma, hereditary breast and ovarian cancer syndrome, hereditary colorectal cancer and other complex and rare hereditary tumors.
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Affiliation(s)
- J X He
- Genetic Diagnosis Center, The First Hospital of Jilin University, Changchun 130021, China
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15
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Tang L, Zhang L, He JX. [A case of Cernunnos gene deficiency]. Zhonghua Er Ke Za Zhi 2017; 55:390-391. [PMID: 28482394 DOI: 10.3760/cma.j.issn.0578-1310.2017.05.017] [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: 06/07/2023]
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16
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Zhang HW, Chen ZW, Wang LY, He JX, Zheng YP, Han WE, Yang B, Wang YL, Zhao ZQ, Bai M, Su LP. [Clinical characteristics and prognosis of concurrent positive t(14; 18) and myc gene rearrangement in diffuse large B cell lymphoma]. Zhonghua Zhong Liu Za Zhi 2016; 38:206-10. [PMID: 26988827 DOI: 10.3760/cma.j.issn.0253-3766.2016.03.009] [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
OBJECTIVE To study the incidence of positive t(14; 18) and myc gene rearrangement, and the clinical features and prognosis of concurrent positive t(14; 18) and myc gene rearrangement "double-hit lymphoma" (DHL) in diffuse large B cell lymphoma. METHODS The positive t(14; 18) and myc gene rearrangement in 106 cases of DLBCL were analyzed using interphase fluorescent in situ hybridization (FISH) technique. The expression of myc and bcl-2 proteins was determined by immunohistochemistry. The relationship of positive t(14; 18) and myc gene rearrangement with clinical features, pathogenesis and prognosis for the patients was analyzed. SPSS 16.0 software was used for statistical analysis. RESULTS Among the 106 cases, there were 27 (25.5%) cases with positive t(14; 18) and 13 (12.3%) cases with myc gene rearrangement, and 7 cases (6.6%) of DLBCL with concurrent t(14; 18)-positive and myc gene rearrangement. A relationship was observed between positive t(14; 18) and myc gene rearrangement (P=0.019). The follow-up data showed that the 7 DHL patients were in age of 52-84 years, the International Prognostic Index (IPI) scores were 3 in two cases, 4 in four cases and 5 in one case, and the ECOG scores were 3 in all the 7 cases. Four patients had bone marrow involvement and were combined with leukemia. The survival time ranged from 0.5 to 6 months, with a median survival of 4 months. The univariate analysis showed that B symptom, Ann Arbor stage, ECOG score, LDH level, IPI score, immunophenotype, bcl-2 protein expression, myc protein expression, and myc gene rearrangement were all associated with poor prognosis (P<0.05 for all). The multivariate analysis using a COX proportional hazard model confirmed that ECOG score, bcl-2 protein expression, myc protein expression, myc gene rearrangement, and immunophenotype were independent prognostic factors affecting survival (P<0.05 for all), among them, the myc gene rearrangement was the strongest prognostic factor (OR=4.337, P<0.001). CONCLUSIONS "Double-hit" DLBCL is rare and can be mainly identified only by molecular detection. Perhaps positive t(14; 18) and myc gene rearrangement play concurrent role in its "double-hit" pathogenesis. DHL are highly invasive, and most of DHL patients have poor prognosis. Further studies of larger case number are required to determine the pathologic features and the therapeutic strategy of this subgroup.
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Affiliation(s)
- H W Zhang
- Department of Hematology, Shanxi Tumor Hospital, Taiyuan 030013, China
| | - Z W Chen
- Department of Pathology, Fenyang College, Shanxi Medical University, Fenyang 032200, China
| | - L Y Wang
- Department of Hematology, Shanxi Tumor Hospital, Taiyuan 030013, China
| | - J X He
- Department of Hematology, Shanxi Tumor Hospital, Taiyuan 030013, China
| | - Y P Zheng
- Department of Hematology, Shanxi Tumor Hospital, Taiyuan 030013, China
| | - W E Han
- Department of Hematology, Shanxi Tumor Hospital, Taiyuan 030013, China
| | - B Yang
- Department of Hematology, Shanxi Tumor Hospital, Taiyuan 030013, China
| | - Y L Wang
- Department of Hematology, Shanxi Tumor Hospital, Taiyuan 030013, China
| | - Z Q Zhao
- Department of Hematology, Shanxi Tumor Hospital, Taiyuan 030013, China
| | - M Bai
- Department of Hematology, Shanxi Tumor Hospital, Taiyuan 030013, China
| | - L P Su
- Department of Hematology, Shanxi Tumor Hospital, Taiyuan 030013, China
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Abstract
OBJECTIVE Thoracic ganglioneuroma is sporadic and rarely reported. Pre-operative misdiagnosis often occurs in clinical practice. To improve diagnostic accuracy and facilitate differential diagnosis, we summarised the CT and MRI findings of thoracic ganglioneuroma. METHODS 22 cases of thoracic ganglioneuroma confirmed by surgery and pathology were retrospectively analysed in terms of CT (16 cases) and MRI data (6 cases). RESULTS Of 22 lesions, 19 occurred in the posterior mediastinum, 2 in the lateral pleura and 1 in the right chest. The CT value of the plain scans ranged from 20 to 40 HU (mean 29.1 HU) in 16 cases. Punctate calcification was noted in four cases. Patchy fat density shadow was found in one case. Arterial-phase CT found nearly no enhancement (6 cases) or slight enhancement (10 cases) with a CT value of 0-12 HU (mean 5.8 HU). In the delayed phase, enhancement was strengthened progressively, and CT value of 10-20 HU (mean 13.6 HU) was achieved after 120 s. T(1) weighted images showed homogeneous hypointense signals in five cases and hypointense signals mixed with patchy hyperintense signal shadow in one case. T(2) weighted images demonstrated heterogeneous hyperintense signals in all six cases, of which the whorled appearance was noted in one case. Gadolinium-diethylenetriaminepentaacetic acid (Gd-DTPA)-enhanced MRI found mildly heterogeneous enhancement in the arterial phase, and progressive mild enhancement in the delayed phase. CONCLUSION Thoracic ganglioneuroma shows hypodensity in plain CT. On CT and MRI, non-enhancement or slight enhancement in artery phase and progressive mild enhancement in delay phase are characteristic manifestations of ganglioneuroma in the thorax.
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Affiliation(s)
- Y B Guan
- Southern Medical University, Guangzhou, China
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18
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Wang S, Xu B, Zhang Y, He JX. Development of enzyme-linked immunosorbent assay (ELISA) for the detection of neomycin residues in pig muscle, chicken muscle, egg, fish, milk and kidney. Meat Sci 2008; 82:53-8. [PMID: 20416595 DOI: 10.1016/j.meatsci.2008.12.003] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2008] [Revised: 12/03/2008] [Accepted: 12/04/2008] [Indexed: 11/26/2022]
Abstract
A colorimetric competitive direct enzyme-linked immunosorbent assay (ELISA) method was developed using polyclonal antibody to determine neomycin residues in food of animal origin. No cross-reactivity of the antibody was observed with other aminoglycosides. The limit of detection of the method was 0.1μg/kg. A simple and efficient sample extraction method was established with recoveries of neomycin ranged from 75% to 105%. The detection limits were 5μg/kg(l) in pig muscle, chicken muscle, fish and milk, 10μg/kg in kidney and 20μg/kg in egg, respectively. Chemiluminescence assay was developed for detecting neomycin residues in pig muscle and chicken muscle. The limit of detection of the method was 0.015μg/kg, and the detection limits were 1.5μg/kg in pig muscle and 6μg/kg in chicken muscle. The ELISA tests were validated by HPLC, and the results showed a good correlation (r(2)) which was greater than 0.9.
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Affiliation(s)
- S Wang
- Key Laboratory of Food Nutrition and Safety, Ministry of Education of China, Tianjin University of Science and Technology, 29 The Thirteenth Road, Tianjin 300457, PR China
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19
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He JX, Akao T, Nishino T, Tani T. The influence of commonly prescribed synthetic drugs for peptic ulcer on the pharmacokinetic fate of glycyrrhizin from Shaoyao-Gancao-tang. Biol Pharm Bull 2001; 24:1395-9. [PMID: 11767109 DOI: 10.1248/bpb.24.1395] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The influence of synthetic drugs prescribed for peptic ulcer on the pharmacokinetic fate of glycyrrhizin (GL) from Shaoyao-Gancao-tang (SGT, a traditional Chinese formulation, Shakuyaku-Kanzo-to in Japanese) was investigated in rats. Co-administration of histamine H2-receptor antagonist (cimetidine) and anticholinergic drug (scopolamine butyl bromide) with SGT didn't influence the area under the plasma concentration-time curves (AUC) of glycyrrhetic acid (GA), an active metabolite derived from GL in SGT. The AUC of GA from SGT were significantly reduced by co-administration of synthetic drugs commonly used for peptic ulcer in a triple therapy (OAM), a combination of a proton pump inhibitor (omeprazole) and two antibiotics (amoxicillin and metronidazole). We found that the reduction of AUC in OAM treatment was due to the antibacterial effect of amoxicillin and metronidazole on intestinal bacteria in rat which lead to the decrease of GL-hydrolysis activity. The present study suggests that it may not be a proper way to use triple therapy containing antibiotics simultaneously with SGT for healing of chronic ulcers.
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Affiliation(s)
- J X He
- Institute of Natural Medicine, Toyama Medical and Pharmaceutical University, Japan
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20
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He JX, Jiang RQ, Zhang XX, Li ZS, Zhao GZ. [Genetic analysis for introgressive genes of petal color from Gossypium bickii to G. hirsutum L]. Yi Chuan Xue Bao 2001; 27:344-50. [PMID: 11147354] [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: 02/18/2023]
Abstract
The character of red petals with a large basal spot was transferred from Gossypium bickii into G. hirsutum L., and the pure lines (HBRL) with the character were obtained by Liang Zhenglan in 1988. Results of genetic analysis for G. hirsutum pure line of red petals (R3bic) and large basal spot (R2bic) were reported in the present study. The large basal spot was dominant to the small basal-spot and spotlessness of G. hirsutum. R2bic was shown to be allelic to R2 of G. hirsutum, and R2bic, R2 and r2 were multiple alleles. R2bic was found to be linked with Lc1, and linkage between R2bic and Lc1 was estimated at 37.31 +/- 2.44 centimorgans, The red petal (R3bic) was epistatic dominance to the yellow petal (Y1) and cream petal (y1), and R3bic is closely linked with R2bic. It is proposed that the introgressive gene of the large basal spot from G. bickii into G. hirsutum be assigned gene symbol R2bic, and the red petals be given the gene symbol R3bic.
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Affiliation(s)
- J X He
- Institute of Genetics, Chinese Academy of Sciences, Beijing 100101, China
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21
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Bi XL, Cao R, He JX, Han F, Wu SH. [Functional and structural study of the prokaryotic enhancer-like element VV16 from vaccinia virus genome]. Sheng Wu Gong Cheng Xue Bao 2000; 16:337-40. [PMID: 11059276] [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: 02/18/2023]
Abstract
An enhancer-like element VV16 from Vaccinia virus genome DNA was obtained by using the plasmid with CAT reporter gene. Sequence analysis showed the element of 112 bp is a part of the DNA-dependent RNA polymerase, polyA polymerase and DNA polymerase (RPO30 gene). It contains 4 AT-rich regions. Detection of beta-galactosidase activity showed that VV16 in the positive direction can increase the activity 9.0 times and VV16 in the negative direction can increase 4.1 times. The RNA dot blotting confirmed the enhancing activity of the element are on the transcription level. DNA deletion experiment indicated the sequences of 10 bp at the 5' end and 12 bp at the 3' end in the element are important to its function and the sequence from nt76 to nt82 is essential to its activity.
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Affiliation(s)
- X L Bi
- State Key Laboratory for Molecular Virology and Genetic Engineering, Chinese Academy of Preventive Medicine, Beijing
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22
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Cody WL, Cai C, Doherty AM, Edmunds JJ, He JX, Narasimhan LS, Plummer JS, Rapundalo ST, Rubin JR, Van Huis CA, St-Denis Y, Winocour PD, Siddiqui MA. The design of potent and selective inhibitors of thrombin utilizing a piperazinedione template: part 1. Bioorg Med Chem Lett 1999; 9:2497-502. [PMID: 10498196 DOI: 10.1016/s0960-894x(99)00418-7] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
Utilizing X-ray crystallography and molecular modeling, highly potent and selective peptidomimetic thrombin inhibitors have been designed containing a rigid piperazinedione template. The synthesis and biological activity of these compounds will be described.
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Affiliation(s)
- W L Cody
- Parke-Davis Pharmaceutical Research, Division of Warner-Lambert Company, Ann Arbor, MI 48105, USA
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23
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Cody WL, Augelli-Szafran CE, Berryman KA, Cai C, Doherty AM, Edmunds JJ, He JX, Narasimhan LS, Penvose-Yi J, Plummer JS, Rapundalo ST, Rubin JR, Van Huis CA, Leblond L, Winocour PD, Siddiqui MA. The design of potent and selective inhibitors of thrombin utilizing a piperazinedione template: part 2. Bioorg Med Chem Lett 1999; 9:2503-8. [PMID: 10498197 DOI: 10.1016/s0960-894x(99)00419-9] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Abstract
Potent and selective thrombin inhibitors have been prepared with a piperazinedione template and L-amino acids. Likewise, incorporation of D-amino acids led to potent inhibitors with a novel mode of binding. Herein, the structure activity relationships and structural aspects of these compounds will be described.
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Affiliation(s)
- W L Cody
- Parke-Davis Pharmaceutical Research, Division of Warner-Lambert Company, Ann Arbor, MI 48105, USA
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24
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Plummer JS, Berryman KA, Cai C, Cody WL, DiMaio J, Doherty AM, Edmunds JJ, He JX, Holland DR, Levesque S, Kent DR, Narasimhan LS, Rubin JR, Rapundalo ST, Siddiqui MA, Susser AJ, St-Denis Y, Winocour PD. Potent and selective bicyclic lactam inhibitors of thrombin: Part 2: P1 modifications. Bioorg Med Chem Lett 1998; 8:3409-14. [PMID: 9873743 DOI: 10.1016/s0960-894x(98)00613-1] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
The synthesis and antithrombotic activity of a series of nonpeptide bicyclic thrombin inhibitors is described. We have explored the SAR with modifications to the P1 site. The introduction of arginine mimetics at the P1 site led to potent and selective thrombin inhibitors.
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Affiliation(s)
- J S Plummer
- Parke-Davis Pharmaceutical Research, Division of Warner-Lambert Company, Ann Arbor, MI 48105, USA
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Cody WL, He JX, Reily MD, Haleen SJ, Walker DM, Reyner EL, Stewart BH, Doherty AM. Design of a potent combined pseudopeptide endothelin-A/endothelin-B receptor antagonist, Ac-DBhg16-Leu-Asp-Ile-[NMe]Ile-Trp21 (PD 156252): examination of its pharmacokinetic and spectral properties. J Med Chem 1997; 40:2228-40. [PMID: 9216842 DOI: 10.1021/jm970161m] [Citation(s) in RCA: 79] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
The endothelins (ETs) are a family of bicyclic 21-amino acid peptides that are potent and prolonged vasoconstrictors. It has been shown that highly potent combined ETA/ETB receptor antagonists can be developed from the C-terminal hexapeptide of ET (His16-Leu17-Asp18-Ile19-Ile20-Trp21), such as Ac-(D)Dip16-Leu-Asp-Ile-Ile-Trp21 (PD 142893) and Ac-DBhg16-Leu-Asp-Ile-Ile-Trp21 (PD 145065). However, these compounds are relatively unstable to enzymatic proteolysis as determined in an in vitro rat intestinal perfusate assay. This instability is thought to be due to carboxypeptidase activity. In fact, incubation of PD 145065 with carboxypeptidase inhibitors greatly increased its half-life in rat intestinal perfusate. By performing a reduced amide bond and N-methyl amino acid scan, it was discovered that N-methylation of Ile-20 resulted in a compound (Ac-DBhg16-Leu-Asp-Ile-[NMe]Ile-Trp21, PD 156252) that retained full receptor affinity at both endothelin receptor subtypes along with enhanced proteolytic stability and cellular permeability. Interestingly, N-methylation of this bond allows the cis configuration to be readily accessible which greatly alters the preferred structure of the entire molecule and may be responsible for the observed enhanced metabolic stability.
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Affiliation(s)
- W L Cody
- Department of Chemistry, Parke-Davis Pharmaceutical Research, Division of Warner-Lambert Company, Ann Arbor, Michigan 48105, USA.
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Abstract
Neurotensin (NT, pGlu-Leu-Tyr-Glu-Asn-Lys-Pro-Arg-Arg-Pro-Tyr-Ile-Leu) is a tridecapeptide that displays a wide spectrum of biological actions. Cyclic derivatives of a hexapeptide NT [(8-13)] (N alpha MeArg-Lys-Pro-Trp-Tle-Leu, Tle = tert-leucine) were designed and prepared by a combination of solution and solid-phase peptide synthetic methodologies. As reported previously, several analogs possessed nanomolar binding affinities for NT receptors in newborn (10-day-old) mouse brain membrane preparations. In this study, we determined the functional ability of these analogs to mobilize intracellular free calcium, [Ca2+]i, in HT-29 cells (human colonic adenocarcinoma). Of greatest interest were the cyclic compounds 2, 6 and 9 that had Ki values of 0.19, 3.50 and 4.18 microM for [3H]NT labeled receptors in the HT-29 cell membrane assay, respectively. In the functional assay, compounds 2 and 6 mobilized [Ca2+] with EC50 values of 0.13 and 20 microM, respectively. In comparison, Compound 9 blocked the NT-induced mobilization of [Ca2+]i, with an IC50 of 1.70 microM. The present findings indicate that small molecule cyclic analogs, that possess functional activity, can be designed and may have therapeutic utility in the treatment of schizophrenia and possibly other neurological disorders.
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Affiliation(s)
- H C Akunne
- College of Pharmacy, Florida A&M University, Tallahassee 32307, USA
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Stewart BH, Reyner EL, Tse E, Hayes RN, Werness S, He JX, Cody WL, Doherty AM. In vitro assessment of oral delivery for hexapeptide endothelin antagonists. Life Sci 1996; 58:971-82. [PMID: 8786709 DOI: 10.1016/0024-3205(96)00045-8] [Citation(s) in RCA: 9] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Endothelin (ET-1) is a 21-amino acid, vasoconstrictive peptide originally isolated from endothelial cells. It is one member of a class of potent, purportedly paracrine substances that act at receptors in multiple target organs. Antagonists to the receptor subtypes, ETA and ETB, have been designed around the hydrophobic carboxy-terminus of ET-1. The resulting hexapeptides possess low nanomolar receptor affinity, but face formidable challenges to oral delivery, given their peptidic nature. Hence, it was important to discriminate between analogs, as well as to optimize structural features combining binding potency with stability in intestinal fluids and permeability across biological membranes. PD 142893 (Ac-DDip16-Leu-Asp-Ile-Trp21) and PD 145065 (Ac-DBhg16-Leu-Asp-Ile-Ile-Trp21), as well as the N-methyl-isoleucine20 analogs were studies, where DDip = 3,3diphenylalanine and DBhg = 10,11-dihydro-5H-dibenzo[a,d]cycloheptene glycine. Analyses were conducted with specific HPLC methods. Permeabilities across CACO-2 cell monolayers ranged from 2.0x10(-4) to 6.3x10(-4)cm/min. The results suggested that these compounds can be absorbed in vivo, based on comparison of permeabilities with those obtained with reference compounds. Much greater differences were observed between the analogs when stability half-lives were compared after incubation in rat intestinal perfusate. The parent peptides, PD 142893 and PD 145065, were unstable, with half-lives less than 20 min. N-Methylation of Ile20 resulted in large increases in stability half-lives to greater 500 min. Enzyme inhibition studies demonstrated the involvement of carboxypeptidase A in production of the primary metabolite, the des-Trp derivative. Identification of the primary metabolite of the parent peptide was made by differential UV scanning at 214/280 nm and mass spectral analyses.
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Affiliation(s)
- B H Stewart
- Pharmacokinetics and Drug Metabolism Department, Parke-Davis Pharmaceutical Research, Warner-Lambert Company, Ann Arbor MI 48105 USA
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Cody WL, He JX, DePue PL, Waite LA, Leonard DM, Sefler AM, Kaltenbronn JS, Haleen SJ, Walker DM, Flynn MA. Structure-activity relationships of the potent combined endothelin-A/endothelin-B receptor antagonist Ac-DDip16-Leu-Asp-Ile-Ile-Trp21: development of endothelin-B receptor selective antagonists. J Med Chem 1995; 38:2809-19. [PMID: 7636842 DOI: 10.1021/jm00015a003] [Citation(s) in RCA: 22] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
The endothelins (ETs) are a family of bicyclic 21-amino acid-containing peptides that are highly potent and prolonged vasoconstrictors. The discovery of potent ET antagonists will facilitate the understanding of the physiological and/or pathophysiological role of ET. Structure-activity studies have revealed the importance of the C-terminal hexapeptide (residues 16-21) of ET (His16-Leu17-Asp18-Ile19-Ile20-Trp21) to the development of potent antagonists at both receptor subtypes (ETA and ETB). In particular, it has been shown that Ac-DDip16-Leu-Asp-Ile-Ile-Trp21 (Dip = 3,3-diphenylalanine) has low nanomolar affinity for the two endothelin receptor subtypes and is a functional antagonist of ET activity, both in vitro and in vivo at both receptors. Herein, we will describe the structure-activity relationships of Ac-DDip16-Leu-Asp-Ile-Ile-Trp21 (PD 142893) with a particular emphasis on modifications that lead to enhanced receptor affinity and/or individual receptor subtype selectivity. In particular, we will demonstrate how we utilized PD 142893 to develop ETB receptor selective ligands and the pharmacological differences that exist between species ETB receptors with respect to their affinity for C-terminal hexapeptide antagonists.
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Affiliation(s)
- W L Cody
- Department of Chemistry, Parke-Davis Pharmaceutical Research, Division of Warner-Lambert Company, Ann Arbor, Michigan 48105, USA
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29
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Reynolds EE, Hwang O, Flynn MA, Welch KM, Cody WL, Steinbaugh B, He JX, Chung FZ, Doherty AM. Pharmacological differences between rat and human endothelin B receptors. Biochem Biophys Res Commun 1995; 209:506-12. [PMID: 7733918 DOI: 10.1006/bbrc.1995.1530] [Citation(s) in RCA: 23] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Cloned rat and human endothelin-B receptors (ETBR) were utilized to determine if there are significant pharmacological differences between highly homologous ETBR from different species. Recombinant rat and human ETBR were expressed in CHO-K1 cells, and radioligand binding studies were carried out with [125I]-ET-3 to determine the affinities of various ET receptor agonists and antagonists for rat and human ETBR. These receptors had similar affinities for a number of ETBR agonists (ET-1, ET-3, S6C, BQ 3020) and antagonists (Ro 47-0203, PD 142893). However, several peptide (PD 147452, PD 151583, BQ 788) and non-peptide (PD 156707, SB 209670) antagonists had different affinities for rat and human ETBR, with differences in Ki values between species ranging from 4.1- to 53.4-fold. The ETBR-selective agonist IRL 1620 also had a 5.7-fold higher affinity for rat ETBR than human ETBR. Thus despite their high degree of homology, rat and human ETBR show significant pharmacological differences with respect to both antagonist and agonist binding.
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Affiliation(s)
- E E Reynolds
- Department of Cardiovascular Therapeutics, Parke-Davis Pharmaceutical Research, Division of Warner-Lambert Company, Ann Arbor, Michigan 48105, USA
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30
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Sefler AM, He JX, Sawyer TK, Holub KE, Omecinsky DO, Reily MD, Thanabal V, Akunne HC, Cody WL. Design and structure-activity relationships of C-terminal cyclic neurotensin fragment analogues. J Med Chem 1995; 38:249-57. [PMID: 7830267 DOI: 10.1021/jm00002a006] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Neurotensin (NT) is a linear tridecapeptide with a broad range of central and peripheral pharmacological effects. The C-terminal hexapeptide of NT (NT8-13) has been shown to possess similar properties to NT itself, and in fact, an analogue of NT8-13 (N alpha MeArg8-Lys-Pro-Trp-Tle-Leu13, Tle = tert-leucine) has been reported to possess central activity after peripheral administration. Cyclic derivatives of this hexapeptide were synthesized by a combination of solution and solid-phase peptide synthetic methodologies, and several analogues had low nanomolar binding affinity for the NT receptor. In particular, cyclo[Arg-Lys-Pro-Trp-Glu]-Leu (cyclized between the alpha amine of Arg and the gamma carboxylate of Glu) possessed 16 nM NT receptor affinity and was determined to be an agonist in vitro. 1H-NMR and 13C-edited 1H-NMR spectroscopy were performed on this and related cyclic analogues to help identify structural properties which may be important for receptor recognition. These cyclic peptides represent novel molecular probes to further investigate NT receptor pharmacology, as well as to advance our understanding of the structure-conformation relationships of NT and to help establish a working basis for additional pharmacophore mapping studies.
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Affiliation(s)
- A M Sefler
- Department of Chemistry, Parke-Davis Pharmaceutical Research, Division of the Warner-Lambert Company, Ann Arbor, Michigan 48106
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31
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He JX, Yang YY, Chen MY. [41 cases of video-assisted thoracoscopy]. Zhonghua Wai Ke Za Zhi 1994; 32:586-8. [PMID: 7750413] [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: 01/26/2023]
Abstract
Video-assisted of thoracoscopic surgery (VATS) is the minimally invasive surgery. It has characteristic of mini-incision, less pain, less bleeding, less transfusing, less affecting cardio pulmonary function. So it is one of the development directions of thoracic surgery. The authors had finished 41 cases VATS. Operative indication was expatiated. The requirement of anesthesia is lower. The patients whose pulmonary function were too severe destructive to walk could be treated by VATS. The authors discussed some questions of VATS.
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Affiliation(s)
- J X He
- First Affiliated Hospital, Guangzhou Medical College
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32
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Heyl DL, Sefler AM, He JX, Sawyer TK, Wustrow DJ, Akunne HC, Davis MD, Pugsley TA, Heffner TG, Corbin AE. Structure-activity and conformational studies of a series of modified C-terminal hexapeptide neurotensin analogues. Int J Pept Protein Res 1994; 44:233-8. [PMID: 7822099 DOI: 10.1111/j.1399-3011.1994.tb00165.x] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Neurotensin (NT), is a linear tetradecapeptide (pGlu1-Leu2-Tyr3-Glu4-Asn5- Lys6-Pro7-Arg8-Arg9-Pro10-Tyr11-Ile12-Leu13) that has been found in the central nervous system and peripheral tissues and appears to have a variety of physiological properties. A C-terminal hexapeptide analogue [N alpha Me-Arg-Lys-Pro-Trp-Tle-Leu, (1) Tle = tert-leucine] has recently been reported to have high affinity for the NT receptor and appears to possess central activity after systemic administration. In an effort to probe the structure-activity and conformational properties of the dipeptide, Pro-Trp for binding and functional activity, these residues have been substituted with several natural and unnatural amino acids. Some of these analogues have binding affinities similar to compound 1, while in other cases, such as D-amino acid substitutions, the peptides had negligible binding affinity. In general, the Pro10 position seems more tolerant of substitution by amino acids that favor a reverse turn, rather than those that favor an extended conformation. The Trp11 position accepted extra steric bulk more readily than conformational constraints.
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Affiliation(s)
- D L Heyl
- Department of Chemistry, Warner-Lambert Co., Ann Arbor, Michigan
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33
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He JX, Yang YY, Lin DP. [Pulmonary resection by dealing with pulmonary vessels inside pericardium: report of 104 cases]. Zhonghua Wai Ke Za Zhi 1994; 32:418-9. [PMID: 7842981] [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: 01/27/2023]
Abstract
During 1985-1993, the writer had performed 104 pulmonary resections, which was 10% of the same time pulmonary resections, to treat type III center lung carcinoma by dealing with pulmonary vessels inside pericardium. The results demonstrated: one-year survival rate was 35%, while three year survival rate was 10%. The writer also found that this kind of operative mode can raise the pulmonary resection rate by 8.75%, and reduce the exploratory thoracotomy rate by 33% compared with the traditionary pulmonary resection.
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Affiliation(s)
- J X He
- First Affiliated Hospital, Guangzhou Medical College
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34
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Doherty AM, Cody WL, DePue PL, He JX, Waite LA, Leonard DM, Leitz NL, Dudley DT, Rapundalo ST, Hingorani GP. Structure-activity relationships of C-terminal endothelin hexapeptide antagonists. J Med Chem 1993; 36:2585-94. [PMID: 8410970 DOI: 10.1021/jm00070a001] [Citation(s) in RCA: 41] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
The discovery of selective endothelin (ET) receptor antagonists will facilitate identification of the physiological and pathological roles for ET and its isopeptides. Structure-activity studies of the C-terminal hexapeptide of ET have been carried out to elucidate those amino acids important for receptor binding and agonist or antagonist activity. Binding studies were performed in rat heart ventricle, rabbit renal artery vascular smooth muscle cells, and rat cerebellum. In addition, many of the compounds have been evaluated functionally for their effects on endothelin-1-induced arachidonic acid release and inositol phosphate accumulation in specific cell lines. Selected compounds have been evaluated in a functional bioassay in tissue preparations specifically expressing either ETA or ETB receptors. We have previously described the structure-activity relationships in the hydrophobic C-terminal hexapeptide of ET, a region known to be highly important for receptor recognition. A mono-D-amino acid scan of the ET[16-21] revealed that substitution at His gave rise to analogs with significantly enhanced binding affinity. We have further evaluated the C-terminal region and will describe the design, synthesis, and pharmacological evaluation of several novel and potent ET peptide receptor antagonists.
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Affiliation(s)
- A M Doherty
- Department of Medicinal Chemistry, Parke-Davis Pharmaceutical Research, Warner-Lambert Company, Ann Arbor, Michigan 48105
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35
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Heyl DL, Cody WL, He JX, Flynn MA, Welch KM, Reynolds EE, Doherty AM. Truncated analogues of endothelin and sarafotoxin are selective for the ETB receptor subtype. Pept Res 1993; 6:238-241. [PMID: 8257799] [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: 05/22/2023]
Abstract
The sarafotoxins (SRTXs) are a family of 21-amino acid bicyclic peptides that are structurally similar to the potent vasoconstrictors, the endothelins (ETs). SRTX-6c exhibits high selectivity for the ETB receptor subtype over the ETA subtype. This selectivity may be a result of a modification at positions 9 or 13, which are Glu9 and Asn13 in SRTX-6c and Lys9 and Tyr13 in ET-1. The truncated linear endothelin [Ala11,15]ET-18-21 was also on ETB receptor-selective ligand with 6-nM binding affinity. Therefore, a series of truncated endothelin/sarafotoxin (8-21) hybrid analogues were prepared, varying the amino acid at residues 9 and/or 13. These peptides were assayed for binding in tissues selectively expressing either the ETA or the ETB receptor subtypes. All linear analogues showed poor ETA binding, while ETB affinity was sequence dependent. Monocyclic 11-15 disulfide-containing analogues failed to bind to either ETA or ETB receptors at concentrations of up to 10 microM.
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Affiliation(s)
- D L Heyl
- Parke-Davis Pharmaceutical Research Division, Warner-Lambert Company
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36
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Plucinska K, Kataoka T, Yodo M, Cody WL, He JX, Humblet C, Lu GH, Lunney E, Major TC, Panek RL. Multiple binding modes for the receptor-bound conformations of cyclic AII agonists. J Med Chem 1993; 36:1902-13. [PMID: 8515427 DOI: 10.1021/jm00065a013] [Citation(s) in RCA: 61] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Angiotensin II, Asp-Arg-Val-Tyr-His-Pro-Phe, binds its receptor with a postulated turn centered at residue four. Analogs of angiotensin II which contain a disulfide bridge between the side chains of residues 3 and 5 retain significant activity consistent with this hypothesis. Incorporation of 4-mercaptoproline residues, a hybrid, or chimeric amino acid which combines the properties of proline and homocysteine, into either of these positions with analogous disulfide bridges allows retention of high affinity for the receptor. These more highly constrained bicyclic systems give new insight into the details of molecular recognition of residues 3-5 of angiotensin by the receptor. Retention of activity by the antiparallel dimer of [Sar1,Cys3,5]-AII in which the peptide backbone is held in an extended conformation was unexpected. Analysis of the conformational constraints imposed in these active analogs suggests that AII agonists bind to their receptor with different backbone conformations in the region of the central tyrosine residue.
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Affiliation(s)
- K Plucinska
- Center for Molecular Design, Washington University School of Medicine, St. Louis, Missouri 63110
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37
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Doherty AM, Cody WL, He JX, DePue PL, Cheng XM, Welch KM, Flynn MA, Reynolds EE, LaDouceur DM, Davis LS. In vitro and in vivo studies with a series of hexapeptide endothelin antagonists. J Cardiovasc Pharmacol 1993; 22 Suppl 8:S98-102. [PMID: 7510009 DOI: 10.1097/00005344-199322008-00027] [Citation(s) in RCA: 51] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
The effects of different amino acids incorporated into the 16 and 17 positions of the C-terminal hexapeptide of ET-1 were examined. Structure-activity relationships (SAR) of the ET receptor antagonists PD 142893 [Ac-(D-Dip16-L-Leu17-L-Asp-L-Ile-L-Ile-L-Trp) (D-Dip = 3,3-D-diphenylalanine)] and PD 145065 [Ac-(D-Bhg16-L-Leu17-L-Asp-L-Ile-L-Ile-L-Trp) (D-Bhg = 5H-dibenzyl[a,d]cycloheptene-10,11-dihydro-glycine)] uncovered certain requirements for high potency. The disodium salt of PD 145065 has 4.0 and 15 nM binding affinity (IC50 values) for the ETA (rabbit renal artery vascular smooth-muscle cells) and ETB receptor (rat cerebellum), respectively. The compound is also an antagonist of ET-1- and SRTX-6c-stimulated vasoconstrictor activity, with pA2 values of 6.9 (rabbit femoral artery, ETA assay) and 7.1 (rabbit pulmonary artery, ETB assay). The tripeptidic ETA antagonist FR 139317 was found to be less active in the rabbit femoral artery, with a pA2 value of 6.0, and inactive in the rabbit pulmonary artery. Substitution of acidic and basic residues at position 17 in PD 142893 and PD 145065 indicates differences in selectivity. Incorporation of bulky non-natural amino acids at position 16 has led to potent nonselective analogues, including Ac-D-Bheg16-L-Leu-L-Asp-L-Ile-L-Ile-L-Trp [D-Bheg (5H-dibenzo[a,d]cycloheptene glycine)]. The in vivo effects of single-bolus doses of selected ET antagonists on depressor and pressor responses to ET-1 in anesthetized ganglion-blocked rats were evaluated.(ABSTRACT TRUNCATED AT 250 WORDS)
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Affiliation(s)
- A M Doherty
- Department of Chemistry, Parke-Davis Pharmaceutical Research, Warner-Lambert Company, Ann Arbor, MI 48105
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38
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Cody WL, Doherty AM, He JX, DePue PL, Rapundalo ST, Hingorani GA, Major TC, Panek RL, Dudley DT, Haleen SJ. Design of a functional hexapeptide antagonist of endothelin. J Med Chem 1992; 35:3301-3. [PMID: 1324321 DOI: 10.1021/jm00095a029] [Citation(s) in RCA: 73] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Affiliation(s)
- W L Cody
- Department of Medicinal Chemistry, Parke-Davis Pharmaceutical Research Division, Warner-Lambert Company, Ann Arbor, Michigan 48106
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39
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He JX. [The population situation and its relation to the economy in Turkey]. Renkou Yanjiu 1982:44-7. [PMID: 12312490] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/19/2023]
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