1
|
Wang H, Yang HJ, Zeng S, Xu MW, Ma JX, Xu MH, Xu LS, Yang DH. [Willis covered stent for paraclinoid aneurysms:efficacy and mid-long-term follow-up results]. Zhonghua Yi Xue Za Zhi 2022; 102:1119-1122. [PMID: 35436812 DOI: 10.3760/cma.j.cn112137-20210803-01726] [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
The clinical data and follow-up results of 27 paraspinoid aneurysms treated by Willis covered stent (WCS) in Department of Neurosurgery, Army Medical University from May 2014 to January 2021 were retrospectively analyzed. Among them, 17 cases (63.0%) were treated with WCS alone, and 10 cases (37.0%) were assisted with coiling embolization. During the follow-up, postoperative internal leakage occurred in 2 patients(7%), of which 1(type Ⅰ) wasself-healing and the other 1 (type Ⅲ) was cured by WCS implantation again. The remaining patients had no aneurysm recurrence, unobstructed parent artery, stent displacement and internal stenosis. 92.6% (25/27) of the improved mRS scores were good. WCS is a safe and effective method for the treatment of parabedinal aneurysms.
Collapse
Affiliation(s)
- H Wang
- Department of Neurosurgery, Daping Hospital, Army Medical University, Chongqing 400042, China
| | - H J Yang
- Department of Neurosurgery, Daping Hospital, Army Medical University, Chongqing 400042, China
| | - Shi Zeng
- Department of Neurosurgery, Daping Hospital, Army Medical University, Chongqing 400042, China
| | - M W Xu
- Department of Neurosurgery, Daping Hospital, Army Medical University, Chongqing 400042, China
| | - J X Ma
- Department of Neurosurgery, Daping Hospital, Army Medical University, Chongqing 400042, China
| | - M H Xu
- Department of Neurosurgery, Daping Hospital, Army Medical University, Chongqing 400042, China
| | - L S Xu
- Department of Neurosurgery, Daping Hospital, Army Medical University, Chongqing 400042, China
| | - D H Yang
- Department of Neurosurgery, Daping Hospital, Army Medical University, Chongqing 400042, China
| |
Collapse
|
2
|
Hou J, Song HF, Chen BG, Xu MH, Gao QW, Wang J, Chen S, Wang F, Wu J, Chai JK. [Clinical effects of pre-expanded anterior perforator flap of transverse cervical artery and pre-expanded thoracic random flap in reconstructing extensive facial and cervical scar in relay]. Zhonghua Shao Shang Za Zhi 2021; 37:350-355. [PMID: 33745256 DOI: 10.3760/cma.j.cn501120-20201023-00445] [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 explore the clinical effects of pre-expanded anterior perforator flap of transverse cervical artery in extensive facial and cervical scar reconstruction and contralateral pre-expanded thoracic random flap in relay in donor site repair. Methods: A retrospective cohort study was conducted. From May 2008 to December 2018, 10 patients with extensive facial and cervical scar after burns were treated in the Fourth Medical Center of PLA General Hospital, including 8 males and 2 females, aged 10-55 years. In the first stage of operation, two skin and soft tissue expanders of the same volume (with rated capacity of 250-600 mL) were respectively placed in the right side and left side of the chest according to the size of scar, and then the skin was expanded. The total amount of normal saline injected was 2 to 4 times of the rated capacity of the expander. In the second stage, the defect with area of 12 cm×8 cm-23 cm×15 cm caused by scar resection and release was repaired with unilateral pre-expanded anterior perforator flap of transverse cervical artery with area of 12 cm×9 cm-24 cm×16 cm. The contralateral pre-expanded thoracic random flap with the same area as that of the above-mentioned perforator flap was extended to repair the secondary defect with area of 8 cm×6 cm-17 cm×14 cm formed after transfer of the above-mentioned perforator flap. The exploration of perforating branch of transverse cervical artery, flap transfer and survival, injury repair, and complications were observed. The appearance and related function of donor and recipient sites and satisfaction of patients were followed up. Results: The perforating branches of transverse cervical artery appeared stably in the 10 patients. All the flaps were transferred to the recipient area without tension and survived. Both facial and cervical injuries were repaired successfully with no common complications. During the follow-up of 6 months-8 years, the color and texture of the pre-expanded anterior perforator flap of transverse cervical artery matched with the surrounding tissue, the functions of head raising and neck rotation of patients were significantly improved compared with those before operation, the color and texture of the flap transplanted in the first donor site matched with the original skin, linear scar left at the surgical incision, and 9 patients were satisfied with the restoration of the appearance and function of donor and recipient sites. Conclusions: The color and texture of the pre-expanded anterior perforator flap of transverse cervical artery match well with the face and neck, and the repairable area is large. After the perforator flap is removed, the secondary wound can be repaired with the pre-expanded thoracic random flap at the same time, and the injury of the chest donor site is alleviated. This relay repair method is a good choice for reconstructing extensive facial and cervical scar.
Collapse
Affiliation(s)
- J Hou
- Medical School of Chinese PLA, Beijing 100853, China
| | - H F Song
- Department of Burns & Plastic Surgery, Institute of Burns, the Fourth Medical Center, PLA General Hospital, Beijing 100048, China
| | - B G Chen
- Department of Burns & Plastic Surgery, Institute of Burns, the Fourth Medical Center, PLA General Hospital, Beijing 100048, China
| | - M H Xu
- Department of Burns & Plastic Surgery, Institute of Burns, the Fourth Medical Center, PLA General Hospital, Beijing 100048, China
| | - Q W Gao
- Department of Burns & Plastic Surgery, Institute of Burns, the Fourth Medical Center, PLA General Hospital, Beijing 100048, China
| | - J Wang
- Department of Burns & Plastic Surgery, Institute of Burns, the Fourth Medical Center, PLA General Hospital, Beijing 100048, China
| | - S Chen
- Epidemic Prevention and Health Care Room of Service Guarantee Center of National Defense University, Beijing 100091, China
| | - F Wang
- Department of Burns & Plastic Surgery, Institute of Burns, the Fourth Medical Center, PLA General Hospital, Beijing 100048, China
| | - J Wu
- Department of Burns & Plastic Surgery, Institute of Burns, the Fourth Medical Center, PLA General Hospital, Beijing 100048, China
| | - J K Chai
- Department of Burns & Plastic Surgery, Institute of Burns, the Fourth Medical Center, PLA General Hospital, Beijing 100048, China
| |
Collapse
|
3
|
Liu FQ, Liu CP, Xu MH, Zhu J, Yu W, Wang LL. Effects of sevoflurane postconditioning on the expression of AKT/mTOR and apoptosis of myocardial cells in myocardial ischemia-reperfusion rats. J BIOL REG HOMEOS AG 2020; 34:1909-1913. [PMID: 33147940 DOI: 10.23812/20-429-l] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- F Q Liu
- Operation Room, The People's Hospital of Zhangqiu area, Jinan, Shandong Province, China
| | - C P Liu
- Department of Cardiology, Jiyang People's Hospital, Jinan, Shandong Province, China
| | - M H Xu
- Department of Clinical Laboratory, Yantai Central Blood Station, Yantai, Shandong Province, China
| | - J Zhu
- Respiratory Department, The People's Hospital of Zhangqiu Area, Jinan, Shandong Province, China
| | - W Yu
- Department of Cardiology, The People's Hospital of Zhangqiu Area, Jinan, Shandong Province, China
| | - L L Wang
- Department of Anesthesiology, Jining No.1 People's Hospital, Affiliated Jining No.1 People's Hospital of Jining Medical University, Jining Medical University, Jining, Shandong Province, China
| |
Collapse
|
4
|
Zhang YQ, Aihemaitijiang S, Yang J, Liao ZY, Zhu WL, Zhang ZF, Xu MH. [Establishment of nutrition literacy core items for Chinese people]. Zhonghua Yu Fang Yi Xue Za Zhi 2020; 54:1069-1074. [PMID: 33115191 DOI: 10.3760/cma.j.cn112150-20200327-00458] [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 establish core items of nutrition literacy for general population in China. Methods: The framework system and preliminary items of nutrition literacy were established through literature review and experts' consultation. Content validity test was used to determine the nutrition literacy item. Thirteen experts in the field of human nutrition, health education and nutrition and diseases were invited to score the importance of each nutrition literacy item via Email. The judgment basis and familiarity of experts towards the items, active coefficient, and content validity were analyzed to generate the final list of nutrition literacy items. Results: 92.3% of questionnaires in two rounds were collected.The active coefficient of experts was satisfied and the authority coefficient was 0.96.In the content validity evaluation, the correlation I-CVI value of each item was above 0.83 and the κ value was above 0.74. The evaluation result was excellent.After the second round of expert consultation, all selected items met the inclusion criteria. We identified the final list of nutrition literacy items consisting of three scales (knowledge and concepts, lifestyles and dietary behaviors, and basic skills), ten subscales (basic nutrition philosophy, food classification and nutrition knowledge, healthy weight, eating behavior and culture, balanced diet, exercise health, food assessment, nutrition information acquisition and decision, nutrition safety, and weight management)with 25 items in total. Conclusions: The framework system and core items of nutrition literacy are established for Chinese people based on the content validity evaluation. The experts involved in the consultation process present a performance with good representativeness, enthusiasm and authority, and the content validity evaluation result is satisfied.
Collapse
Affiliation(s)
- Y Q Zhang
- Department of Nutrition and Food Hygiene, School of Public Health, Peking University, Beijing 100191, China
| | - Sumiya Aihemaitijiang
- Department of Nutrition and Food Hygiene, School of Public Health, Peking University, Beijing 100191, China
| | - J Yang
- Department of Nutrition and Food Hygiene, School of Public Health, Peking University, Beijing 100191, China
| | - Z Y Liao
- Department of Nutrition and Food Hygiene, School of Public Health, Peking University, Beijing 100191, China
| | - W L Zhu
- Department of Nutrition and Food Hygiene, School of Public Health, Peking University, Beijing 100191, China
| | - Z F Zhang
- Department of Nutrition and Food Hygiene, School of Public Health, Peking University, Beijing 100191, China
| | - M H Xu
- Department of Nutrition and Food Hygiene, School of Public Health, Peking University, Beijing 100191, China
| |
Collapse
|
5
|
Li HJ, Sun ZL, Pan YB, Xu MH, Feng DF. Effect of α7nAChR on learning and memory dysfunction in a rat model of diffuse axonal injury. Exp Cell Res 2019; 383:111546. [PMID: 31398352 DOI: 10.1016/j.yexcr.2019.111546] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [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: 03/08/2019] [Revised: 08/02/2019] [Accepted: 08/03/2019] [Indexed: 11/30/2022]
Abstract
Diffuse axonal injury (DAI) is the predominant effect of severe traumatic brain injury and significantly contributes to cognitive deficits. The mechanisms that underlie these cognitive deficits are often associated with complex molecular alterations. α7nAChR, one of the abundant and widespread nicotinic acetylcholine receptors (nAChRs) in the brain, plays important physiological functions in the central nervous system. However, the relationship between temporospatial alterations in the α7nAChR and DAI-related learning and memory dysfunction are not completely understood. Our study detected temporospatial alterations of α7nAChR in vulnerable areas (hippocampus, internal capsule, corpus callosum and brain stem) of DAI rats and evaluated the development and progression of learning and memory dysfunction via the Morris water maze (MWM). We determined that α7nAChR expression in vulnerable areas was mainly reduced at the recovery of DAI in rats. Moreover, the escape latency of the injured group increased significantly and the percentages of the distance travelled and time spent in the target quadrant were significantly decreased after DAI. Furthermore, α7nAChR expression in the vulnerable area was significantly positively correlated with MWM performance after DAI according to regression analysis. In addition, we determined that a selective α7nAChR agonist significantly improved learning and memory dysfunction. Rats in the α7nAChR agonist group showed better learning and memory performance than those in the antagonist group. These results demonstrate that microstructural injury-induced alterations of α7nAChR in the vulnerable area are significantly correlated with learning and memory dysfunctions after DAI and that augmentation of the α7nAChR level by its agonist contributes to the improvement of learning and memory function.
Collapse
Affiliation(s)
- Hong-Jiang Li
- Department of Neurosurgery, Shanghai Ninth People's Hospital, Shanghai JiaoTong University School of Medicine, Shanghai, 201999, China; Institute of Traumatic Medicine, Shanghai JiaoTong University School of Medicine, Shanghai, 201999, China
| | - Zhao-Liang Sun
- Department of Neurosurgery, Shanghai Ninth People's Hospital, Shanghai JiaoTong University School of Medicine, Shanghai, 201999, China; Institute of Traumatic Medicine, Shanghai JiaoTong University School of Medicine, Shanghai, 201999, China
| | - Yuan-Bo Pan
- Department of Neurosurgery, Shanghai Ninth People's Hospital, Shanghai JiaoTong University School of Medicine, Shanghai, 201999, China
| | - Mang-Hua Xu
- Institute of Traumatic Medicine, Shanghai JiaoTong University School of Medicine, Shanghai, 201999, China
| | - Dong-Fu Feng
- Department of Neurosurgery, Shanghai Ninth People's Hospital, Shanghai JiaoTong University School of Medicine, Shanghai, 201999, China; Institute of Traumatic Medicine, Shanghai JiaoTong University School of Medicine, Shanghai, 201999, China.
| |
Collapse
|
6
|
Liu XH, Wu H, Huang YF, Zhang GY, Xu MH. [Clinical characteristics of malignant peritoneal mesothelioma misdiagnosed as tuberculous peritonitis: a report of 6 cases]. Zhonghua Yi Xue Za Zhi 2019; 99:1893-1897. [PMID: 31269586 DOI: 10.3760/cma.j.issn.0376-2491.2019.24.011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Objective: To reduce the misdiagnosis rate of ascites and improve the diagnosis rate of malignant peritoneal mesothelioma. Methods: From May 2008 to May 2018, in Xiangya Hospital of Central South University,the clinical data of malignant peritoneal mesothelioma misdiagnosed as tuberculous peritonitis were retrospectively analyzed. Results: (1) Among the 6 patients, they were male; the age of onset was 42-70 (52±9.57) years old, and there was no history of asbestos exposure. (2) All cases with abdominal pain or abdominal distension were there and the course of disease was more than 1 month to more than 2 years. (3) In all patients,the nature of ascites was exudate; ADA was higher than normal value and below 45 U/L; LDH value in ascites was higher than 200 U/L (83.3%); mesothelioma was considered in ascites cytology in 1 case. (4) Laparoscopic biopsy was performed in 2 cases and B-ultrasound guided biopsy in 4 cases; Among them, malignant peritoneal mesothelioma diagnosed by pathology. (5) In Immunohistochemical positive markers, MC was the most sensitive (100%), followed by CR (67%), CK-Pan (67%), Ki-67 (67%) and EMA (67%). (6) Two patients received treatment with operation, abdominal hyperthermic perfusion and postoperative systemic chemotherapy. Conclusions: (1) Malignant peritoneal mesothelioma should be considered in middle-aged and aged male patients with unexplained ascites and early laparoscopy or laparotomy for diagnosis. (2) ADA and LDH level in ascites are significant in differentiating tuberculous peritonitis from malignant peritoneal mesothelioma. (3) Immunohistochemical positive marker MC may be a potential specific marker for malignant mesothelioma. (4) The survival time of patients is improved by comprehensive treatment such as operation and chemotherapy.
Collapse
Affiliation(s)
- X H Liu
- Department of Gastroenterology, Xiangya Hospital, Central South University, Changsha 410005, China
| | | | | | | | | |
Collapse
|
7
|
Li HJ, Sun ZL, Pan YB, Sun YY, Xu MH, Feng DF. Inhibition of miRNA-21 promotes retinal ganglion cell survival and visual function by modulating Müller cell gliosis after optic nerve crush. Exp Cell Res 2019; 375:10-19. [PMID: 30639060 DOI: 10.1016/j.yexcr.2019.01.009] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2018] [Revised: 12/29/2018] [Accepted: 01/08/2019] [Indexed: 12/20/2022]
Abstract
BACKGROUND Müller cell gliosis not only plays an important physiological role by maintaining retinal neuronal homeostasis but is also associated with multiple pathological events in the retina, including optic nerve crush (ONC) injury. Modulating Müller cell gliosis contributes to the creation of a permissive environment for neuronal survival. However, the underlying mechanism of Müller cell gliosis has remained elusive. OBJECTIVE To investigate the underlying mechanism of Müller cell gliosis after ONC. METHODS Rats with ONC injury were transfected with miRNA-21 (miR-21) agomir (overexpressing miR-21) or antagomir (inhibiting miR-21) via intravitreous injection. Immunofluorescence and western blotting were performed to confirm the effects of miR-21 on Müller cell gliosis. The retinal nerve fiber layer (RNFL) thickness was measured using optical coherence tomography and the positive scotopic threshold response (pSTR) was recorded using electroretinogram. RESULTS In the acute phase (14 days) after ONC, compared with the crushed group, inhibiting miR-21 promoted Müller cell gliosis, exhibiting thicker processes and increased GFAP expression. In the chronic phase (35 days), inhibiting miR-21 ameliorated Müller cell gliosis, which exhibited thicker and denser processes and increased GFAP expression. Retinal ganglion cell (RGC) counts in retinas showed that the number of surviving RGCs increased significantly in the antagomir group. The thickness of the RNFL increased significantly, and pSTR showed significant preservation of the amplitudes in the antagomir group. CONCLUSIONS Inhibition of miR-21 promotes RGC survival, RNFL thickness and the recovery of RGC function by modulating Müller cell gliosis after ONC.
Collapse
Affiliation(s)
- Hong-Jiang Li
- Department of Neurosurgery, Shanghai Ninth People's Hospital, Shanghai JiaoTong University School of Medicine, Shanghai 201999, China; Institute of Traumatic Medicine, Shanghai JiaoTong University School of Medicine, Shanghai 201999, China
| | - Zhao-Liang Sun
- Department of Neurosurgery, Shanghai Ninth People's Hospital, Shanghai JiaoTong University School of Medicine, Shanghai 201999, China
| | - Yuan-Bo Pan
- Institute of Traumatic Medicine, Shanghai JiaoTong University School of Medicine, Shanghai 201999, China
| | - Yi-Yu Sun
- Institute of Traumatic Medicine, Shanghai JiaoTong University School of Medicine, Shanghai 201999, China
| | - Mang-Hua Xu
- Institute of Traumatic Medicine, Shanghai JiaoTong University School of Medicine, Shanghai 201999, China
| | - Dong-Fu Feng
- Department of Neurosurgery, Shanghai Ninth People's Hospital, Shanghai JiaoTong University School of Medicine, Shanghai 201999, China; Institute of Traumatic Medicine, Shanghai JiaoTong University School of Medicine, Shanghai 201999, China.
| |
Collapse
|
8
|
Abstract
Studying natural variation in rice resistance genes of cultivated and wild rice relatives can predict resistance stability to rice blast fungus. In the present study, the protein coding regions of the rice R gene Pi-d2 in 35 rice accessions, including Oryza sativa L. subsp. indica Kato (Aus), indica (IND), temperate japonica (TEJ), tropical japonica (TRJ), aromatic (ARO); subgroups of Oryza sativa; 6 accessions of wild rice varieties; O. nivara; and O. rufipogon were analyzed. A total of 13 nucleotide differences were found in the open reading frames (ORFs) of Pi-d2. Translation of these ORFs revealed 9 variants; 3 were novel Pi-d2 variants. Variants H2 and H5 were identified in accessions of cultivated rice and O. nivara, H1, H3, H4, H6, and H8 were only identified in cultivated rice. H2 and H5 were the common types of IND and O. nivara, H8 was the common type of TRJ and AUS, H6 was the specific type of AUS, and H3 was the specific type of ARO. H7 and H9 were specific haplotypes of O. nivara and O. rufipogon, respectively. These findings demonstrate that Pi-d2 variants are useful indicators for each subgroup, and Pi-d2 is an ancient gene that predates speciation of rice subgroups.
Collapse
Affiliation(s)
- J B Li
- Agricultural Environment and Resources Research Institute, Yunnan Academy of Agricultural Sciences, Kunming, Yunnan Province, China
| | - Y D Sun
- The Key Laboratory of Biotechnology Research of Yunnan Province, Yunnan Academy of Agricultural Sciences, Kunming, Yunnan Province, China
| | - H Liu
- Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming, Yunnan Province, China
| | - Y Y Wang
- The Key Laboratory of Biotechnology Research of Yunnan Province, Yunnan Academy of Agricultural Sciences, Kunming, Yunnan Province, China
| | - Y L Jia
- United States Department of Agriculture-Agricultural Research Service, Dale Bumpers National Rice Research Center, Stuttgart, Arkansas, USA
| | - M H Xu
- The Key Laboratory of Biotechnology Research of Yunnan Province, Yunnan Academy of Agricultural Sciences, Kunming, Yunnan Province, China
| |
Collapse
|
9
|
Yang GL, Tao HR, Wang HW, Sun Y, Zhang LD, Zhang C, He W, Xu MH, Zhao JM, Gao FH. Ara-C increases gastric cancer cell invasion by upregulating CD-147-MMP-2/MMP‑9 via the ERK signaling pathway. Oncol Rep 2015; 33:2045-51. [PMID: 25625234 DOI: 10.3892/or.2015.3748] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2014] [Accepted: 12/02/2014] [Indexed: 02/07/2023] Open
Abstract
Gastric cancer cell are not particularly sensitive to Ara-C, a deoxycytidine analog that affects DNA synthesis. In the present study, AGS and MKN-45 gastric cancer cell lines were treated with Ara-C to determine its role in cell prolife-ration and apoptosis. The antiproliferative effect of Ara-C was assessed using the Cell Counting kit-8. Gelatinase zymography was utilized to detect the activity of MMP-2 and MMP-9, and an in vitro invasion assay was performed. Using RT-PCR, CD-147, MMP-2 and MPP-9 mRNA levels were assessed in AGS cells with various doses of Ara-C treatment. CD-147, MMP-2 and MMP-9 protein levels were analysed in Ara-C‑treated AGS and MKN-45 cells. AGS cells were treated with or without U-0126 or siRNA-CD147 and/or Ara-C for 24 h, and an in vitro invasion assay was performed. Although low-dose Ara-C had no obvious effect on cell proliferation, it upregulated the expression of MMP-2, MMP-9 and CD-147 and ERK activation. Low-dose Ara-C increased gastric cancer cell invasion. U-0126 and siRNA-CD-147 inhibited the induction of Ara-C in gastric cancer cell invasion. Therefore, Ara-C enhances the invasiveness of gastric cancer cells by expression of CD-147 /MMP-2 and MMP-9 via the ERK signaling pathway. The results are therefore useful in the prevention of Ara-C collateral damage associated with standard, conventional protocols of chemotherapy administration.
Collapse
Affiliation(s)
- Guang-Lin Yang
- Department of General Surgery, Shanghai 9th People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200011, P.R. China
| | - Hai-Rong Tao
- Department of Orthopaedic Surgery, Shanghai 9th People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200011, P.R. China
| | - Han-Wei Wang
- Department of Hematology and Rheumatology, Bengbu Third People's Hospital Affiliated to Southeast University, Bengbu, Anhui 233000, P.R. China
| | - Yun Sun
- Department of Clinical Laboratory, Dong-Nan Hospital, Shanghai 200023, P.R. China
| | - Li-Di Zhang
- Institute of Oncology, Shanghai 9th People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200011, P.R. China
| | - Chao Zhang
- Institute of Oncology, Shanghai 9th People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200011, P.R. China
| | - Wei He
- Institute of Oncology, Shanghai 9th People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200011, P.R. China
| | - Mang-Hua Xu
- Institute of Oncology, Shanghai 9th People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200011, P.R. China
| | - Jiang-Min Zhao
- Department of Radiology, Shanghai 9th People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200011, P.R. China
| | - Feng-Hou Gao
- Institute of Oncology, Shanghai 9th People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200011, P.R. China
| |
Collapse
|
10
|
Wei Y, Zhang YJ, Cai Y, Xu MH. The role of mitochondria in mTOR-regulated longevity. Biol Rev Camb Philos Soc 2014; 90:167-81. [PMID: 24673778 DOI: 10.1111/brv.12103] [Citation(s) in RCA: 272] [Impact Index Per Article: 27.2] [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: 06/23/2013] [Revised: 02/07/2014] [Accepted: 02/27/2014] [Indexed: 11/27/2022]
Abstract
Several unbiased genome-wide RNA interference (RNAi) screens have pointed to mitochondrial metabolism as the major factor for lifespan regulation. However, conflicting data remain to be clarified concerning the mitochondrial free radical theory of aging (MFRTA). Recently, mTOR (mechanistic target of rapamycin) has been proposed to be the central regulator of aging although how mTOR modulates lifespan is poorly understood. Interestingly, mTOR has been shown to regulate many aspects of mitochondrial function, such as mitochondrial biogenesis, apoptosis, mitophagy and mitochondrial hormesis (mitohormesis) including the retrograde response and mitochondrial unfolded protein response (mito-UPR). Here we discuss the data linking mitochondrial metabolism to mTOR regulation of lifespan, suggesting that hormetic effects may be key to explaining some controversial results regarding the MFRTA. We also discuss the possibility that dysfunction of mitochondrial adaptive responses rather than free radicals per se contributes to the aging process.
Collapse
Affiliation(s)
- Yuehua Wei
- No.3 People's Hospital, School of Medicine, Shanghai Jiao Tong University, 280 Mohe Road, Shanghai, 201900, China
| | | | | | | |
Collapse
|
11
|
Fang Y, Hu XH, Jia ZG, Xu MH, Guo ZY, Gao FH. Tiron protects against UVB-induced senescence-like characteristics in human dermal fibroblasts by the inhibition of superoxide anion production and glutathione depletion. Australas J Dermatol 2012; 53:172-80. [PMID: 22734867 DOI: 10.1111/j.1440-0960.2012.00912.x] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [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
BACKGROUND/OBJECTIVES Free radicals and reactive oxygen species (ROS), which are generated by UV irradiation, may induce an irreversible growth arrest similar to senescence. Tiron, 4,5-dihydroxy-1,3-benzene disulfonic acid, is a widely used antioxidant to rescue ROS-evoked cell death. The aim of the article was to explore the effects of tiron on skin photoaging and associated mechanisms. METHODS The effects of tiron on cell proliferation were determined using 3-(4,5-dimethylthiazol-2-Yl)-2,5-diphenyltetrazolium bromide. Senescent cells were determined by morphology and senescence-associated β-galactosidase activity analysis. Intracellular hydrogen peroxide, superoxide anion and glutathione concentration were analysed by a fluorescent probe. The concomitant changes of protein expression were analysed with Western blot. RESULTS Human dermal fibroblasts were induced to premature senescence by sub-cytotoxic doses of irradiated UVB. Strong senescence-associated β-galactosidase activity and increased intracellular superoxide anion were observed in human dermal fibroblasts irradiated by UVB. Tiron blocks UVB-induced glutathione depletion and increase of superoxide anion and protects against UVB-induced senescence-like characteristics in human dermal fibroblasts. Compared with normal fibroblasts, UVB-irradiated human dermal fibroblasts showed a higher ratio of active (hypophosphorylated) to inactive (phosphorylated) forms of Rb and p38, upregulation of p53 or p16 and c-Myc and insulin-like growth factor 1 (IGF-1) downregulation. After treatment with tiron, p53, p16 c-Myc and IGF-1 as well as phosphorylation Rb and p38 could partially recover. CONCLUSION These results indicate that tiron protects against UVB-induced senescence-like characteristics in human dermal fibroblasts via the inhibition of production of superoxide anion and glutathione depletion, and modulation of related senescence proteins.
Collapse
Affiliation(s)
- Yong Fang
- No.3 People's Hospital/Shanghai Jiao-Tong University School of Medicine (SJTU-SM), Shanghai, China
| | | | | | | | | | | |
Collapse
|
12
|
Gao FH, Liu F, Wei W, Liu LB, Xu MH, Guo ZY, Li W, Jiang B, Wu YL. Oridonin induces apoptosis and senescence by increasing hydrogen peroxide and glutathione depletion in colorectal cancer cells. Int J Mol Med 2012; 29:649-55. [PMID: 22294162 PMCID: PMC3577350 DOI: 10.3892/ijmm.2012.895] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.7] [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: 11/14/2011] [Accepted: 12/22/2011] [Indexed: 12/16/2022] Open
Abstract
We recently demonstrated that oridonin could induce apoptosis and senescence of colon cancer cells in vitro and in vivo. However, the underlying mechanism remains unknown. In this study, the involvement of reactive oxygen species in oridonin-induced cell death and senescence was investigated in colon adenocarcinoma-derived SW1116 cells. Oridonin increased intracellular hydrogen peroxide levels and reduced the glutathione content in a dose-dependent manner. N-acetylcysteine, a reactive oxygen species scavenger, not only blocked the oridonin-induced increase in hydrogen peroxide and glutathione depletion, but also blocked apoptosis and senescence induced by oridonin, as evidenced by the decrease in Annexin V and senescence-associated β-galactosidase- positive cells and the inhibition of oridonin-induced upregulation of p53 and p16 and downregulation of c-Myc. Moreover, exogenous catalase could inhibit the increase in hydrogen peroxide and apoptosis induced by oridonin, but not the glutathione depletion and senescence. Furthermore, thioredoxin reductase (TrxR) activity was reduced by oridonin in vitro and in cells, which may cause the increase in hydrogen peroxide. In conclusion, the increase in hydrogen peroxide and glutathione depletion account for oridonin-induced apoptosis and senescence in colorectal cancer cells, and TrxR inhibition is involved in this process. Given the importance of TrxR as a novel cancer target in colon cancer, oridonin would be a promising clinical candidate. The mechanism of oridonin-induced inhibition of TrxR warrants further investigation.
Collapse
Affiliation(s)
- Feng-Hou Gao
- Number 3 People's Hospital, Affiliated to Shanghai Jiao-Tong University School of Medicine, Shanghai 201900, PR China
| | | | | | | | | | | | | | | | | |
Collapse
|
13
|
Gao FH, Hu XH, Li W, Liu H, Zhang YJ, Guo ZY, Xu MH, Wang ST, Jiang B, Liu F, Zhao YZ, Fang Y, Chen FY, Wu YL. Oridonin induces apoptosis and senescence in colorectal cancer cells by increasing histone hyperacetylation and regulation of p16, p21, p27 and c-myc. BMC Cancer 2010; 10:610. [PMID: 21054888 PMCID: PMC2992521 DOI: 10.1186/1471-2407-10-610] [Citation(s) in RCA: 75] [Impact Index Per Article: 5.4] [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] [Received: 11/27/2009] [Accepted: 11/06/2010] [Indexed: 12/14/2022] Open
Abstract
Background Oridonin, a tetracycline diterpenoid compound, has the potential antitumor activities. Here, we evaluate the antitumor activity and action mechanisms of oridonin in colorectal cancer. Methods Effects of oridonin on cell proliferation were determined by using a CCK-8 Kit. Cell cycle distribution was determined by flow cytometry. Apoptosis was examined by analyzing subdiploid population and terminal deoxynucleotidyl transferase-mediated dUTP nick end labeling assay. Senescent cells were determined by senescence-associated β-galactosidase activity analysis. Semi-quantitative RT-PCR was used to examine the changes of mRNA of p16, p21, p27 and c-myc. The concomitant changes of protein expression were analyzed with Western blot. Expression of AcH3 and AcH4 were examined by immunofluorescence staining and Western blots. Effects of oridonin on colony formation of SW1116 were examined by Soft Agar assay. The in vivo efficacy of oridonin was detected using a xenograft colorectal cancer model in nude mice. Results Oridonin induced potent growth inhibition, cell cycle arrest, apoptosis, senescence and colony-forming inhibition in three colorectal cancer cell lines in a dose-dependent manner in vitro. Daily i.p. injection of oridonin (6.25, 12.5 or 25 mg/kg) for 28 days significantly inhibited the growth of SW1116 s.c. xenografts in BABL/C nude mice. With western blot and reverse transcription-PCR, we further showed that the antitumor activities of oridonin correlated with induction of histone (H3 and H4) hyperacetylation, activation of p21, p27 and p16, and suppression of c-myc expression. Conclusion Oridonin possesses potent in vitro and in vivo anti-colorectal cancer activities that correlated with induction of histone hyperacetylation and regulation of pathways critical for maintaining growth inhibition and cell cycle arrest. Therefore, oridonin may represent a novel therapeutic option in colorectal cancer treatment.
Collapse
Affiliation(s)
- Feng-Hou Gao
- NO 3 People's Hospital affiliated to Shanghai Jiao-Tong University School of Medicine, Shanghai 201900, PR China
| | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
14
|
Xu MH, Gong YS, Su MS, Dai ZY, Dai SS, Bao SZ, Li N, Zheng RY, He JC, Chen JF, Wang XT. Absence of the adenosine A2A receptor confers pulmonary arterial hypertension and increased pulmonary vascular remodeling in mice. J Vasc Res 2010; 48:171-83. [PMID: 20938208 DOI: 10.1159/000316935] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2009] [Accepted: 05/24/2010] [Indexed: 01/22/2023] Open
Abstract
BACKGROUND Pulmonary arterial hypertension (PAH) is characterized by sustained elevation of pulmonary vascular resistance resulting from endothelial and smooth muscle cell dysfunction and collagen deposition in pulmonary vascular walls. In this study, we investigated the role of the adenosine A(2A) receptor (A(2A)R) in the development of PAH by determining the effect of genetic inactivation of A(2A)Rs on pulmonary vascular remodeling in mice. METHODS AND RESULTS We characterized hemodynamic, histological and ultrastructural changes in pulmonary vascular remodeling in A(2A)R knockout (KO) mice compared with their wild-type (WT) littermates after exposure to normoxia and hypoxic conditions. After exposure to normoxia, compared to WT mice, A(2A)R KO mice displayed: (1) increased right ventricular systolic pressures and an elevated ratio of the right ventricle over left ventricle plus septum (Fulton index), (2) increased wall area and thickness as well as enhanced smooth muscle actin immunoreactivity in pulmonary resistance vessels, (3) increased proliferating cell nuclear antigen-positive cells in pulmonary resistance vessels and (4) increased smooth muscle cells hypertrophy and collagen deposition in the adventitia of pulmonary arteriole walls as revealed by electron microscope. By contrast, histological analysis revealed no features of hypertensive nephropathy in A(2A)R KO mice and there was no significant difference in systemic blood pressure, and left ventricular masses among the 3 genotypes. Furthermore, following chronic exposure to hypoxia, A(2A)R KO mice exhibited exacerbated elevation in right ventricular systolic pressure, hypertrophy of pulmonary resistance vessels and increased cell proliferation in pulmonary resistance vessels, compared to WT littermates. Thus, genetic inactivation of A(2A)Rs selectively produced PAH and associated increased smooth muscle proliferation and collagen deposition. CONCLUSIONS Extracellular adenosine acting at A(2A)Rs represents an important regulatory mechanism to control the development of PAH and pulmonary vascular remodeling.
Collapse
Affiliation(s)
- M H Xu
- The Experimental Neurobiology Research Institute, Wenzhou Medical College, Zhejiang, PR China
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
15
|
Zhang YJ, Dai Q, Sun DF, Xiong H, Tian XQ, Gao FH, Xu MH, Chen GQ, Han ZG, Fang JY. mTOR signaling pathway is a target for the treatment of colorectal cancer. Ann Surg Oncol 2009; 16:2617-28. [PMID: 19517193 DOI: 10.1245/s10434-009-0555-9] [Citation(s) in RCA: 103] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2009] [Revised: 04/07/2009] [Accepted: 05/05/2009] [Indexed: 02/06/2023]
Abstract
BACKGROUND mTOR signaling has been suggested to be an important factor involved in tumorigenesis, but its role in human colorectal cancer (CRC) has not been completely elucidated. Herein, the purpose of this study was to analyze the distribution pattern of mTOR signaling components in CRC and adenoma and to determine whether targeted inhibition of mTOR could be a potential therapeutic strategy for CRC. METHODS Immunohistochemical analysis was performed on human CRC and adenoma for mTOR signaling components, including mTOR, p70s6 K, and 4EBP1. HCT116 and SW480 human CRC cell lines were treated with siRNA directed against mTOR, and cell viability, cell cycle, and apoptosis were assessed. HCT116 and SW480 cells were injected into athymic nude mice to establish a CRC xenograft model. Mice were randomly transfected with either nontargeting control or mTOR siRNA, and tumor volume, mTOR signaling activity, and apoptosis were evaluated. RESULTS mTOR signaling components, including mTOR, p70s6 K, and 4EBP1, were highly activated in glandular elements of CRC and colorectal adenomas with high-grade intraepithelial neoplasia (HIN), with a correlation between staining intensity and depth of infiltration in CRC. Inhibition of mTOR expression using a specific mTOR siRNA resulted in considerably decreased in vitro and in vivo cell growth. CONCLUSIONS mTOR signaling is associated with the clinical pathological parameters of human CRC. siRNA-mediated gene silencing of mTOR may be a novel therapeutic strategy for CRC.
Collapse
Affiliation(s)
- Yan-Jie Zhang
- Shanghai Institute of Digestive Disease, Shanghai Jiaotong University School of Medicine Renji Hospital, Shanghai, China
| | | | | | | | | | | | | | | | | | | |
Collapse
|
16
|
Guo ZY, Wang ST, Xu MH, Jiao Q, Gao FH. [Protective effects of rhu TNFR: Fc against the lipopolysaccharide induced intestinal damage of rats and its underlying mechanism]. Yao Xue Xue Bao 2009; 44:586-590. [PMID: 19806887] [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: 05/28/2023]
Abstract
To investigate the protective effects of recombinant human tumor necrosis factor receptor II: IgG Fc fusion protein (rhu TNFR: Fc) against the lipopolysaccharide (LPS) induced intestinal damage of rats and its underlying mechanism. SD rats were randomly divided into four groups: control group, rhuTNFR: Fc group, LPS group and rhu TNFR: Fc + LPS group. Mean arterial pressure (MAP) was continuously monitored and the mortality rates were assessed. The levels of TNF-alpha and its bioactivity in the serum were assessed by ELISA and flow cytometry respectively. Pathologic changes of intestinal tissue were observed by HE staining. The rats of control and rhu TNFR: Fc group all survived with stable MAP, and the low level and bioactivity of TNF-alpha in the serum were maintained. While 83% of the rats in LPS group died by 6 h with the levels and bioactivity of TNF-alpha increasing significantly. In rhu TNFR: Fc + LPS group, the mortality rate of rats dropped to 33%. The TNF-alpha level increased compared with control group but its bioactivity decreased significantly compared with LPS group. The MPO activity and content of MDA decreased significantly. The status of pathological manifestation in the intestine was also ameliorated. These data suggest that rhu TNFR: Fc could protect rats from the acute intestine injury induced by LPS through ablating the rise in serum TNF-alpha level and bioactivity as well as anti-oxidation.
Collapse
Affiliation(s)
- Zhu-Ying Guo
- No. 3 People's Hospital AfFiliated to School of Medicine, Shanghai Jiaotong University, Shanghai 201900, China.
| | | | | | | | | |
Collapse
|
17
|
Chen LM, Kando M, Xu MH, Li YT, Koga J, Chen M, Xu H, Yuan XH, Dong QL, Sheng ZM, Bulanov SV, Kato Y, Zhang J, Tajima T. Study of x-ray emission enhancement via a high-contrast femtosecond laser interacting with a solid foil. Phys Rev Lett 2008; 100:045004. [PMID: 18352290 DOI: 10.1103/physrevlett.100.045004] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/06/2006] [Indexed: 05/26/2023]
Abstract
We observed the increase of the conversion efficiency from laser energy to Kalpha x-ray energy (eta(K)) produced by a 60 fs frequency doubled high-contrast laser pulse focused on a Cu foil, compared to the case of the fundamental laser pulse. eta(K) shows a strong dependence on the nonlinearly modified rising edge of the laser pulse. It reaches a maximum for a 100 fs negatively modified pulse. The hot electron efficient heating leads to the enhancement of eta(K). This demonstrates that high-contrast lasers are an effective tool for optimizing eta(K), via increasing the hot electrons by vacuum heating.
Collapse
Affiliation(s)
- L M Chen
- Advanced Photon Research Center, Kansai Photon Science Institute, JAEA, Kyoto 619-0215, Japan
| | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
18
|
Yuan XH, Li YT, Xu MH, Zheng ZY, Yu QZ, Liang WX, Zhang Y, Liu F, Bernhardt J, Wang SJ, Wang ZH, Ling WJ, Wei ZY, Zhao W, Zhang J. Effective fast electron acceleration along the target surface. Opt Express 2008; 16:81-86. [PMID: 18521134 DOI: 10.1364/oe.16.000081] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
The dependence of angular distributions of fast electrons generated in the interaction of p-polarized femtosecond laser pulses with foil targets on laser intensities is investigated. A novel fast electron beam along the front target surface is observed for high laser intensity. It is found that the electron acceleration along the target surface is more efficient than those in other directions.
Collapse
Affiliation(s)
- X H Yuan
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
19
|
Li YT, Xu MH, Yuan XH, Wang WM, Chen M, Zheng ZY, Sheng ZM, Yu QZ, Zhang Y, Liu F, Jin Z, Wang ZH, Wei ZY, Zhao W, Zhang J. Effect of target shape on fast electron emission in femtosecond laser-plasma interactions. Phys Rev E Stat Nonlin Soft Matter Phys 2008; 77:016406. [PMID: 18351943 DOI: 10.1103/physreve.77.016406] [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] [Received: 06/08/2007] [Revised: 11/06/2007] [Indexed: 05/26/2023]
Abstract
Fast electron emission from the interaction of femtosecond laser pulses with shaped solid targets has been studied. It is found that the angular distributions of the forward fast electrons are highly dependent upon the target shapes. The important roles played by the electrostatic fields built up at the non-laser-irradiated target surfaces and the collisions in the target are identified. Our two-dimensional particle-in-cell simulations with binary collisions included reproduce the main experimental observations.
Collapse
Affiliation(s)
- Y T Li
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
20
|
Carroll DC, McKenna P, Lundh O, Lindau F, Wahlström CG, Bandyopadhyay S, Pepler D, Neely D, Kar S, Simpson PT, Markey K, Zepf M, Bellei C, Evans RG, Redaelli R, Batani D, Xu MH, Li YT. Active manipulation of the spatial energy distribution of laser-accelerated proton beams. Phys Rev E Stat Nonlin Soft Matter Phys 2007; 76:065401. [PMID: 18233889 DOI: 10.1103/physreve.76.065401] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/09/2007] [Revised: 09/28/2007] [Indexed: 05/25/2023]
Abstract
The spatial energy distributions of beams of protons accelerated by ultrahigh intensity (>10(19)Wcm2) picosecond laser pulse interactions with thin foil targets are investigated. Using separate, low intensity (<10(13)Wcm2) nanosecond laser pulses, focused onto the front surface of the target foil prior to the arrival of the high intensity pulse, it is demonstrated that the proton beam profile can be actively manipulated. In particular, results obtained with an annular intensity distribution at the focus of the low intensity beam are presented, showing smooth proton beams with a sharp circular boundary at all energies, which represents a significant improvement in the beam quality compared to irradiation with the picosecond beam alone.
Collapse
Affiliation(s)
- D C Carroll
- SUPA, Department of Physics, University of Strathclyde, Glasgow G4 0NG, United Kingdom
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
21
|
Li YT, Yuan XH, Xu MH, Zheng ZY, Sheng ZM, Chen M, Ma YY, Liang WX, Yu QZ, Zhang Y, Liu F, Wang ZH, Wei ZY, Zhao W, Jin Z, Zhang J. Observation of a fast electron beam emitted along the surface of a target irradiated by intense femtosecond laser pulses. Phys Rev Lett 2006; 96:165003. [PMID: 16712242 DOI: 10.1103/physrevlett.96.165003] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/10/2005] [Revised: 02/15/2006] [Indexed: 05/09/2023]
Abstract
A novel fast electron beam emitting along the surface of a target irradiated by intense laser pulses is observed. The beam is found to appear only when the plasma density scale length is small. Numerical simulations reveal that the electron beam is formed due to the confinement of the surface quasistatic electromagnetic fields. The results are of interest for potential applications of fast electron beams and deep understanding of the cone-target physics in the fast ignition related experiments.
Collapse
Affiliation(s)
- Y T Li
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
22
|
Jin Z, Zhang J, Xu MH, Lu X, Li YT, Wang ZH, Wei ZY, Yuan XH, Yu W. Control of filamentation induced by femtosecond laser pulses propagating in air. Opt Express 2005; 13:10424-10430. [PMID: 19503257 DOI: 10.1364/opex.13.010424] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Filamentation formed by self-focusing of intense laser pulses propagating in air is investigated. It is found that the position of filamentation can be controlled continuously by changing the laser power and divergence angle of the laser beam. An analytical model for the process is given.
Collapse
|
23
|
Liao ZY, Tang YH, Xu MH, Feng YM, Zhu SQ. B9-serine residue is crucial for insulin actions in glucose metabolism. Acta Pharmacol Sin 2001; 22:939-43. [PMID: 11749779] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/23/2023] Open
Abstract
AIM To explore the importance of B9 and B10 amino acid residues in the insulin molecule. METHODS The [B9Glu, B10Asp] insulin (E,D-insulin) receptor binding activity, glucose upta ke activity, and lipogenesis activity were measured in isolated adipocytes. The translocation of glucose transporter 4 (Glut4) and the phosphorylation of insulin receptor (IR) stimulated by E, D-insulin were determined by Western blotting. RESULTS Compared with native insulin, the receptor binding activity of E,D-insulin was 31 %; the stimulating activity of E,D-insulin in glucose transport and lipogenesis were 45 % and 40 % respectively; the stimulations of Glut4 translocation and insulin receptor autophosphorylation of E,D-insulin were about 58 % and 46 % respectively. CONCLUSION B9-serine residue is crucial for insulin actions in glucose metabolism.
Collapse
Affiliation(s)
- Z Y Liao
- Institute of Biochemistry, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai 200031, China
| | | | | | | | | |
Collapse
|
24
|
Xu MH, Wang W, Xia LJ, Lin GQ. Development of a New Reaction System for the Synthesis of Highly Optically Active α,γ-Substituted γ-Butyrolactones. J Org Chem 2001; 66:3953-62. [PMID: 11375020 DOI: 10.1021/jo0155153] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A highly useful method for the synthesis of optically active alpha,gamma-substituted gamma-butyrolactones has been developed. The SmI(2)-induced reductive coupling of chiral 2-alkyl acrylates derived from isosorbide with ketones in the presence of (1S)-(-)-2,10-camphorsultam as a proton source give the chiral alpha,gamma-substituted gamma-butyrolactones in good yields and high enantiomeric purities (up to >99% ee for trans and 75% ee for cis). The reaction system has been investigated with various ketones, and it is demonstrated that this system is very effective for trans-alpha,gamma-substituted gamma-butyrolactones. Both the chiral auxiliary and the hindered proton source in this system are necessary for the observed excellent ee values of the products. The absolute configuration of the trans products is assigned on the basis of the X-ray crystal structure.
Collapse
Affiliation(s)
- M H Xu
- Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 354 Fenglin Lu, Shanghai 200032, P. R. China
| | | | | | | |
Collapse
|
25
|
Xu MH, Wang W, Lin GQ. A highly efficient asymmetric synthesis of optically active alpha, gamma-substituted gamma-butyrolactones using a chiral auxiliary derived from isosorbide. Org Lett 2000; 2:2229-32. [PMID: 10930250 DOI: 10.1021/ol005978f] [Citation(s) in RCA: 39] [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] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Using an easily accessible and inexpensive chiral auxiliary derived from isosorbide, optically active alpha,gamma-substituted gamma-butyrolactones were obtained in high enantiomeric purity (up to >99% ee for trans) by the SmI(2)-induced reductive coupling of chiral methacrylate 7 with ketones in the presence of (-)-sultam as a proton source.
Collapse
Affiliation(s)
- M H Xu
- Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 354 Fenlin Lu, Shanghai 200032, P. R. China
| | | | | |
Collapse
|
26
|
|
27
|
Xie ZM, Mao QF, Xu MH, Gu PD, Xie ZJ. [Phenomenon of intrinsic rhythm of luteinizing hormone release from isolated anterior pituitary gland of female rat]. Sheng Li Xue Bao 1997; 49:649-56. [PMID: 9863187] [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: 02/09/2023]
Abstract
The intrinsic nature of rthymic release of luteinizing hormone (LH) of isolated human and rat anterior pituitary gland reported independently by Macro Gambacciani and Xie in 1987 can be more directly demonstrated by a computer programme of Time Series-HSY Hidden Periodic Analytic Approach for continuous monitoring the LH output of the perfusate from a perfusion system with in vitro anterior pituitary of SD female rat. The results are as follows: (1) Under various reproductive conditions the average frequency (min/cycle) and amplitude (ng/ml) of the intrinsic rhythm of LH release were quite different: In proestrous group the frequency and amplitude were the highest, being intermediate in the ovariectomized group and lowest in the lactation group. (2) The intrinsic rhythm of LH release could be changed by either peptide or steroid hormones. In proestrous group with 30 min of gonadotropin-releasing hormone (GnRH), stimulation would reduce both frequency and amplitude. In case of lactation, the frequency was unchanged, but amplitude lowered, while in the ovariectomized rat pituitary, the 30 min GnRH stimulation decreased the frequency of release only. The intrinsic rhythm of the LH release could also be influenced by steriod hormones (Ru486 and Anordrin). With 120 min before removal of the anterior pituitary gland the rats receiving i.m. injection of Ru486 (2 mg/kg bw) or Anordrin (2 mg/kg), the results showed that Ru486 decreased frequency, while Anordrin decreased only the frequency to a less extent, both without amplitude affected. (3) Verapamil and EGTA added to the perfusion system did not abolish but only decreased the rhythmic phenomenon by using proestrous pitutary. This suggests that participation of Ca2+ may take place in the intrinsic release of LH. The above results indicated that the intrinsic rhythm of LH release of isolated anterior pituitary gland is different from various reproductive hormonal conditions and capable of being modified by exogenous hormones. The physiological function of the intrinsic rhythm of LH release of anterior pituitary gland remains to be elucidated.
Collapse
Affiliation(s)
- Z M Xie
- Shanghai Institute of Planned Parenthood Research, WHO Collaborating Center for Research in Human Reproduction
| | | | | | | | | |
Collapse
|
28
|
Zhang ZG, Xu MH, Wang MQ. [Immunohistochemical study on estrogen receptors in conventionally formalin-fixed, paraffin-embedded tissues of endometrial carcinoma]. Zhonghua Fu Chan Ke Za Zhi 1994; 29:667-9, 699-700. [PMID: 7712889] [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
Using specific monoclonal antibody to human estrogen receptors (ER), monoclonal antibody H222, with an avidin-biotin-peroxidase complex method, immunohistochemical localization of ER was performed on formalin-fixed, paraffin-embedded tissues of 42 endometrial carcinomas. The paraffin sections were preceded by trypsin treatment to expose antigenic sites. Immunohistochemical evaluation incorporated both the intensity and distribution of staining into a semiquantitative analysis. Specific staining for ER was observed only in the nuclei of epithelial, stromal and malignant cells. No specific cytoplasmic staining was observed in all paraffin sections. ER-positive staining [histologic score (H-score) > or = 75] was found in 23 (54.8%) of 42 samples and the ER H-Score of cancer components was significantly associated with the histological grade of endometrial carcinomas (P < 0.05). The ER-positive patients tended to have a better prognosis than ER-negative ones. Thus, it may be concluded that the treated formalin-fixed, paraffin-embedded tissues are still suitable for detecting ER by the immunohistochemical method, and the ER content of endometrial carcinomas is useful in indicating the differentiation of cancer and in predicting the patient's prognosis.
Collapse
Affiliation(s)
- Z G Zhang
- Affiliated Hospital, Shandong Medical University, Jinan
| | | | | |
Collapse
|
29
|
Hua XY, Xu MH, Lin QD. [Prenatal diagnosis of Duchenne's muscular dystrophy fetus at risk]. Zhonghua Fu Chan Ke Za Zhi 1994; 29:408-10, 445. [PMID: 8001417] [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: 01/28/2023]
Abstract
Prenatal diagnosis of Duchenne's muscular dystrophy (DMD) have been carried out on 12 fetus at risk. The gene mutations have been identified by hybridization with cDNA probes and/or multiplex PCR. The fetus examined were 7 males and 3 females. Three of the male fetus inherited the same deleted mutations as the probands, and other 4 appeared normal. Among the 3 female fetus, one carried a deleted gene, two were considered normal. The diagnosis of the fetus were confirmed after birth or abortion. As the multiplex PCR can quickly detect about 98% of the deletions on the dystrophin gene, it is not only an idea method for screening the gene deletion but can also be applied to prenatal diagnosis immediately after the nature of the deletion have been identified among the probands. The strategy of prenatal diagnosis of DMD in our country was also discussed.
Collapse
Affiliation(s)
- X Y Hua
- University of Medical Sciences, Guangzhou
| | | | | |
Collapse
|
30
|
Lu WY, Hsieh CM, Xu MH, Nan ZY. [Comparison of the effect of various dosages of anordrin and levonorgestrel on the pituitary responsiveness to GnRH]. Sheng Li Xue Bao 1988; 40:271-7. [PMID: 3142042] [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: 01/04/2023]
|
31
|
Yang LZ, Hsieh CM, Xu MH, Yang AL. [Studies on the spontaneous contraction and the response to NE of isolated oviductal isthmic muscle from Chinese women under different ovarian hormonal conditions]. Sheng Li Xue Bao 1987; 39:365-72. [PMID: 3686055] [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: 01/06/2023]
|
32
|
Hsieh CM, Zhao BG, Xu MH. [Effect of anordrin on the rat anterior pituitary responsiveness to GnRH in vitro]. Sheng Li Xue Bao 1985; 37:486-91. [PMID: 3915600] [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: 01/08/2023]
|