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Li YW, Chen MN, Dai JY, Zhou Y. Guiding infrared electromagnetic waves through TI nanowires with extremely large wavenumber and azimuthal index. J Phys Condens Matter 2024; 36:275001. [PMID: 38537285 DOI: 10.1088/1361-648x/ad3876] [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] [Subscribe] [Scholar Register] [Received: 02/01/2024] [Accepted: 03/27/2024] [Indexed: 04/09/2024]
Abstract
In this paper, the dispersion relations of the surface plasmon polaritons (SPPs) in TI nanowires have been investigated. For simplicity, TI nanowire has been modeled as a dielectric cylinder with a conductive surface, the conductivity of which is an anti-symmetric tensor. The off-diagonal terms of the conductivity tensor only slightly change the dispersion relations. Due to small conductivities, these SPPs have extremely large wavenumbers and azimuthal indices; the electric fields are tightly confined near the conductive surface. For high-order modes, cut-off phenomena have been observed. In the end, the effects of losses and much larger bulk permittivities on the dispersion relations of surface plasmons have been discussed. The simple model proposed in this paper can be directly applied to other materials with arbitrary surface conductivity. Our investigations show that TI nanostructures are promising platforms for nanophotonic applications in the future.
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Affiliation(s)
- Y W Li
- School of Science, Hangzhou Dianzi University, Hangzhou 310018, People's Republic of China
| | - M N Chen
- School of Science, Hangzhou Dianzi University, Hangzhou 310018, People's Republic of China
| | - J Y Dai
- School of Science, Hangzhou Dianzi University, Hangzhou 310018, People's Republic of China
| | - Yu Zhou
- School of Science, Hangzhou Dianzi University, Hangzhou 310018, People's Republic of China
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2
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Chen MN, Zhou Y. Plasmonic detection of the parity anomaly in a two-dimensional Chern insulator. J Phys Condens Matter 2023; 36:035001. [PMID: 37816370 DOI: 10.1088/1361-648x/ad0207] [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] [Subscribe] [Scholar Register] [Received: 08/08/2023] [Accepted: 10/10/2023] [Indexed: 10/12/2023]
Abstract
In this paper, we present an analytic study on the surface plasmon polaritons in a two-dimensional parity anomaly Chern insulator. The two-dimensional conductivities derived from the BHZ model are antisymmetric, based on which two surface plasmon modes each contains two branches of dispersions have been found. In the absence of parity anomaly, the half-integer-valued Hall conductivities with positive and negative Dirac mass terms differ by a sign; two branches of each surface plasmon mode are exactly degenerate. However, the parity anomaly can lift such degeneracy and lead to significant modifications of these dispersion curves or even the occurrence of an extra branch of surface plasmons under particular condition. Our investigations have revealed the effects of the interplay of parity anomaly and topology on the dispersion relations of the surface plasmon polaritons, which may pave a possible way for the detection of the parity anomaly in a two-dimensional Chern insulator via plasmonic responses.
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Affiliation(s)
- M N Chen
- School of Science, Hangzhou Dianzi University, Hangzhou 310018, People's Republic of China
| | - Yu Zhou
- School of Science, Hangzhou Dianzi University, Hangzhou 310018, People's Republic of China
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3
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Chen ZH, Du DY, Fu YF, Wu JJ, Guo DY, Li YY, Chen MN, Yuan ZD, Zhang KW, Zhang ZY, Li X, Yuan FL. Citric acid-modified pH-sensitive bone-targeted delivery of estrogen for the treatment of postmenopausal osteoporosis. Mater Today Bio 2023; 22:100747. [PMID: 37576873 PMCID: PMC10415756 DOI: 10.1016/j.mtbio.2023.100747] [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] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2023] [Revised: 06/20/2023] [Accepted: 07/24/2023] [Indexed: 08/15/2023] Open
Abstract
Bone targeted delivery of estrogen offers great promise for the clinical application of estrogen in the treatment of postmenopausal osteoporosis (PMOP). However, the current bone-targeted drug delivery system still has several issues that need to be solved, such as the side effects of bone-targeted modifier molecules and the failure of the delivery system to release rapidly in the bone tissue. It is important to aggressively search for new bone-targeted modifier molecules and bone microenvironment-responsive delivery vehicles. Inspired by the distribution of citric acid (CA) mainly in bone tissue and the acidic bone resorption microenvironment, we constructed a CA-modified diblock copolymer poly(2-ethyl-2-oxazoline)-poly(ε-caprolactone) (CA-PEOz) drug delivery system. In our study, we found that the CA modification significantly increased the bone targeting of this drug delivery system, and the delivery system was able to achieve rapid drug release under bone acidic conditions. The delivery system significantly reduced bone loss in postmenopausal osteoporotic mice with a significant reduction in estrogenic side effects on the uterus. In summary, our study shows that CA can act as an effective bone targeting modifier molecule and provides a new option for bone targeting modifications. Our study also provides a new approach for bone-targeted delivery of estrogen for the treatment of PMOP.
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Affiliation(s)
- Zhong-Hua Chen
- Affiliated Hospital 3 of Nantong University, Medical School of Nantong University, Jiangsu, China
| | - De-Yan Du
- School of Chemical and Material Engineering, Jiangnan University, Jiangsu, China
| | - Yi-Fei Fu
- Institute of Integrated Chinese and Western Medicine, Affiliated Hospital of Jiangnan University, Jiangsu, China
| | - Jun-Jie Wu
- Institute of Integrated Chinese and Western Medicine, Affiliated Hospital of Jiangnan University, Jiangsu, China
| | - Dan-Yang Guo
- Institute of Integrated Chinese and Western Medicine, Affiliated Hospital of Jiangnan University, Jiangsu, China
| | - Yue-Yue Li
- Institute of Integrated Chinese and Western Medicine, Affiliated Hospital of Jiangnan University, Jiangsu, China
| | - Meng-Nan Chen
- Institute of Integrated Chinese and Western Medicine, Affiliated Hospital of Jiangnan University, Jiangsu, China
| | - Zheng-Dong Yuan
- Institute of Integrated Chinese and Western Medicine, Affiliated Hospital of Jiangnan University, Jiangsu, China
| | - Kai-Wen Zhang
- Institute of Integrated Chinese and Western Medicine, Affiliated Hospital of Jiangnan University, Jiangsu, China
| | - Zhen-Yu Zhang
- Institute of Integrated Chinese and Western Medicine, Affiliated Hospital of Jiangnan University, Jiangsu, China
| | - Xia Li
- Institute of Integrated Chinese and Western Medicine, Affiliated Hospital of Jiangnan University, Jiangsu, China
| | - Feng-Lai Yuan
- Affiliated Hospital 3 of Nantong University, Medical School of Nantong University, Jiangsu, China
- Institute of Integrated Chinese and Western Medicine, Affiliated Hospital of Jiangnan University, Jiangsu, China
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Tian F, Jia Y, Yuan FL, Yuan ZD, Wu JJ, Li YY, Zhang KW, Guo DY, Chen WW, Chen MN, Chen ZH, Li X. Comments on ''Efficacy of Topical Losartan in Management of Mammoplasty and Abdominoplasty Scars: A Randomized, Double-Blind Clinical Trial''. Aesthetic Plast Surg 2023; 47:114-115. [PMID: 35943541 DOI: 10.1007/s00266-022-03046-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2022] [Accepted: 07/26/2022] [Indexed: 12/16/2022]
Affiliation(s)
- Fan Tian
- Jiangnan University, Wuxi, Jiangsu, 214041, China
| | - Yuan Jia
- Wuxi Clinical Medicine School of Integrated Chinese and Western Medicine, Nanjing University of Chinese Medicine, Wuxi, 214041, China
| | - Feng-Lai Yuan
- Institute of Integrated Chinese and Western Medicine, The Hospital Affiliated to Jiangnan University, Wuxi, Jiangsu, 214041, China
| | - Zheng-Dong Yuan
- Institute of Integrated Chinese and Western Medicine, The Hospital Affiliated to Jiangnan University, Wuxi, Jiangsu, 214041, China
| | - Jun-Jie Wu
- Institute of Integrated Chinese and Western Medicine, The Hospital Affiliated to Jiangnan University, Wuxi, Jiangsu, 214041, China
| | - Yue-Yue Li
- Jiangnan University, Wuxi, Jiangsu, 214041, China
| | - Kai-Wen Zhang
- Wuxi Clinical Medicine School of Integrated Chinese and Western Medicine, Nanjing University of Chinese Medicine, Wuxi, 214041, China
| | - Dan-Yang Guo
- Jiangnan University, Wuxi, Jiangsu, 214041, China
| | - Wei-Wei Chen
- Jiangnan University, Wuxi, Jiangsu, 214041, China
| | | | | | - Xia Li
- Institute of Integrated Chinese and Western Medicine, The Hospital Affiliated to Jiangnan University, Wuxi, Jiangsu, 214041, China.
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Chen ZH, Wu JJ, Guo DY, Li YY, Chen MN, Zhang ZY, Yuan ZD, Zhang KW, Chen WW, Tian F, Ye JX, Li X, Yuan FL. Physiological functions of podosomes: From structure and function to therapy implications in osteoclast biology of bone resorption. Ageing Res Rev 2023; 85:101842. [PMID: 36621647 DOI: 10.1016/j.arr.2023.101842] [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: 08/30/2022] [Revised: 12/09/2022] [Accepted: 01/03/2023] [Indexed: 01/07/2023]
Abstract
With increasing age, bone tissue undergoes significant alterations in composition, architecture, and metabolic functions, probably causing senile osteoporosis. Osteoporosis possess the vast majority of bone disease and associates with a reduction in bone mass and increased fracture risk. Bone loss is on account of the disorder in osteoblast-induced bone formation and osteoclast-induced bone resorption. As a unique bone resorptive cell type, mature bone-resorbing osteoclasts exhibit dynamic actin-based cytoskeletal structures called podosomes that participate in cell-matrix adhesions specialized in the degradation of mineralized bone matrix. Podosomes share many of the same molecular constitutions as focal adhesions, but they have a unique structural organization, with a central core abundant in F-actin and encircled by scaffolding proteins, kinases and integrins. Here, we conclude recent advancements in our knowledge of the architecture and the functions of podosomes. We also discuss the regulatory pathways in osteoclast podosomes, providing a reference for future research on the podosomes of osteoclasts and considering podosomes as a therapeutic target for inhibiting bone resorption.
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Affiliation(s)
- Zhong-Hua Chen
- Affiliated Hospital 3 of Nantong University, Nantong University, Jiangsu, China
| | - Jun-Jie Wu
- Institute of Integrated Chinese and Western Medicine, Affiliated Hospital of Jiangnan University, Jiangsu, China
| | - Dan-Yang Guo
- Institute of Integrated Chinese and Western Medicine, Affiliated Hospital of Jiangnan University, Jiangsu, China
| | - Yue-Yue Li
- Institute of Integrated Chinese and Western Medicine, Affiliated Hospital of Jiangnan University, Jiangsu, China
| | - Meng-Nan Chen
- Institute of Integrated Chinese and Western Medicine, Affiliated Hospital of Jiangnan University, Jiangsu, China
| | - Zhen-Yu Zhang
- Institute of Integrated Chinese and Western Medicine, Affiliated Hospital of Jiangnan University, Jiangsu, China
| | - Zheng-Dong Yuan
- Institute of Integrated Chinese and Western Medicine, Affiliated Hospital of Jiangnan University, Jiangsu, China
| | - Kai-Wen Zhang
- Nanjing University of Chinese Medicine, Nanjing, Jiangsu, China
| | - Wei-Wei Chen
- Institute of Integrated Chinese and Western Medicine, Affiliated Hospital of Jiangnan University, Jiangsu, China
| | - Fan Tian
- Institute of Integrated Chinese and Western Medicine, Affiliated Hospital of Jiangnan University, Jiangsu, China
| | - Jun-Xing Ye
- Institute of Integrated Chinese and Western Medicine, Affiliated Hospital of Jiangnan University, Jiangsu, China
| | - Xia Li
- Affiliated Hospital 3 of Nantong University, Nantong University, Jiangsu, China; Institute of Integrated Chinese and Western Medicine, Affiliated Hospital of Jiangnan University, Jiangsu, China.
| | - Feng-Lai Yuan
- Affiliated Hospital 3 of Nantong University, Nantong University, Jiangsu, China; Institute of Integrated Chinese and Western Medicine, Affiliated Hospital of Jiangnan University, Jiangsu, China.
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Qin Y, Chen ZH, Wu JJ, Zhang ZY, Yuan ZD, Guo DY, Chen MN, Li X, Yuan FL. Circadian clock genes as promising therapeutic targets for bone loss. Biomed Pharmacother 2023; 157:114019. [PMID: 36423544 DOI: 10.1016/j.biopha.2022.114019] [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: 09/21/2022] [Revised: 11/11/2022] [Accepted: 11/13/2022] [Indexed: 11/22/2022] Open
Abstract
The circadian clock regulates many key physiological processes such as the sleep-wake cycle, hormone release, cardiovascular health, glucose metabolism and body temperature. Recent evidence has suggested a critical role of the circadian system in controlling bone metabolism. Here we review the connection between bone metabolism and the biological clock, and the roles of these mechanisms in bone loss. We also analyze the regulatory effects of clock-related genes on signaling pathways and transcription factors in osteoblasts and osteoclasts. Additionally, osteocytes and endothelial cells (ECs) regulated by the circadian clock are also discussed in our review. Furthermore, we also summarize the regulation of circadian clock genes by some novel modulators, which provides us with a new insight into a potential strategy to prevent and treat bone diseases such as osteoporosis by targeting circadian genes.
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Affiliation(s)
- Yi Qin
- Xuzhou Medical University, Xuzhou, Jiangsu, China
| | - Zhong-Hua Chen
- Institute of Integrated Chinese and Western Medicine, The Hospital Affiliated to Jiangnan University, Wuxi, Jiangsu 214041, China
| | - Jun-Jie Wu
- Institute of Integrated Chinese and Western Medicine, The Hospital Affiliated to Jiangnan University, Wuxi, Jiangsu 214041, China
| | - Zhen-Yu Zhang
- Institute of Integrated Chinese and Western Medicine, The Hospital Affiliated to Jiangnan University, Wuxi, Jiangsu 214041, China
| | - Zheng-Dong Yuan
- Institute of Integrated Chinese and Western Medicine, The Hospital Affiliated to Jiangnan University, Wuxi, Jiangsu 214041, China
| | - Dan-Yang Guo
- Institute of Integrated Chinese and Western Medicine, The Hospital Affiliated to Jiangnan University, Wuxi, Jiangsu 214041, China
| | - Meng-Nan Chen
- Institute of Integrated Chinese and Western Medicine, The Hospital Affiliated to Jiangnan University, Wuxi, Jiangsu 214041, China
| | - Xia Li
- Institute of Integrated Chinese and Western Medicine, The Hospital Affiliated to Jiangnan University, Wuxi, Jiangsu 214041, China.
| | - Feng-Lai Yuan
- Institute of Integrated Chinese and Western Medicine, The Hospital Affiliated to Jiangnan University, Wuxi, Jiangsu 214041, China.
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Zhou Y, Chen MN. Surface plasmons in anisotropic 3D gapped topological insulators. J Phys Condens Matter 2022; 35:085001. [PMID: 36541525 DOI: 10.1088/1361-648x/aca7aa] [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] [Subscribe] [Scholar Register] [Received: 09/13/2022] [Accepted: 11/30/2022] [Indexed: 06/17/2023]
Abstract
Topological insulators (TIs) are materials having conductive surfaces but insulating bulk, which are ideal platforms for plasmonic applications. The most commonly known TIs, such as Bi2Se3and Bi2Te3, are in fact highly anisotropic. The dielectric constants are largely different parallel and perpendicular to the surface. Here, we have extended the electromagnetic calculations of the surface plasmons in TIs to the anisotropic case. Magnetic field perpendicular to the surface is allowed, which opens a gap among the surface states. We model anisotropic TIs as bulk dielectric materials with different in-plane and out-of-plane permittivities; the surface states caused by the band inversion lead to a two-dimensional conductivity which supports surface plasmons. We have found two rather than one surface modes. Due to such anisotropy, quasi transverse electric (TE) polarized mode may occur near the interband transition threshold. Far below the transition frequency, another mode with both TE and transverse magnetic polarized components dominates, the dispersion relation of which is seriously modified by the Hall conductivity. By taking Bi2Te3as an example, we have derived the conductivity tensor with the consideration of the hexagonal warping effect, and solved the above mentioned two surface plasmon modes. In the end, finite element method has been used to calculate the electric field distributions. Our extension of the electromagnetic calculations of surface plasmons including a specific kind of anisotropy might be useful in other surface conductive materials with similar symmetry as well.
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Affiliation(s)
- Yu Zhou
- School of Science, Hangzhou Dianzi University, Hangzhou 310018, People's Republic of China
| | - M N Chen
- School of Science, Hangzhou Dianzi University, Hangzhou 310018, People's Republic of China
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Jia Y, Shao JH, Zhang KW, Zou ML, Teng YY, Tian F, Chen MN, Chen WW, Yuan ZD, Wu JJ, Yuan FL. Emerging Effects of Resveratrol on Wound Healing: A Comprehensive Review. Molecules 2022; 27:molecules27196736. [PMID: 36235270 PMCID: PMC9570564 DOI: 10.3390/molecules27196736] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2022] [Revised: 10/01/2022] [Accepted: 10/02/2022] [Indexed: 11/07/2022] Open
Abstract
Resveratrol (RSV) is a natural extract that has been extensively studied for its significant anti-inflammatory and antioxidant effects, which are closely associated with a variety of injurious diseases and even cosmetic medicine. In this review, we have researched and summarized the role of resveratrol and its different forms of action in wound healing, exploring its role and mechanisms in promoting wound healing through different modes of action such as hydrogels, fibrous scaffolds and parallel ratio medical devices with their anti-inflammatory, antioxidant, antibacterial and anti-ageing properties and functions in various cells that may play a role in wound healing. This will provide a direction for further understanding of the mechanism of action of resveratrol in wound healing for future research.
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Affiliation(s)
- Yuan Jia
- Wuxi Clinical Medicine School of Integrated Chinese and Western Medicine, Nanjing University of Chinese Medicine, Wuxi 214041, China
| | - Jia-Hao Shao
- Wuxi Clinical Medicine Hospital of Chinese Medicine, Nanjing University of Chinese Medicine, Wuxi 214041, China
| | - Kai-Wen Zhang
- Wuxi Clinical Medicine School of Integrated Chinese and Western Medicine, Nanjing University of Chinese Medicine, Wuxi 214041, China
| | - Ming-Li Zou
- Wuxi Clinical Medicine School of Integrated Chinese and Western Medicine, Nanjing University of Chinese Medicine, Wuxi 214041, China
| | - Ying-Ying Teng
- Department of Burns and Plastic Surgery, the Affiliated Hospital of Jiangnan University, Wuxi 214041, China
| | - Fan Tian
- Department of Burns and Plastic Surgery, the Affiliated Hospital of Jiangnan University, Wuxi 214041, China
| | - Meng-Nan Chen
- Department of Burns and Plastic Surgery, the Affiliated Hospital of Jiangnan University, Wuxi 214041, China
| | - Wei-Wei Chen
- Department of Burns and Plastic Surgery, the Affiliated Hospital of Jiangnan University, Wuxi 214041, China
| | - Zheng-Dong Yuan
- Department of Burns and Plastic Surgery, the Affiliated Hospital of Jiangnan University, Wuxi 214041, China
| | - Jun-Jie Wu
- Department of Burns and Plastic Surgery, the Affiliated Hospital of Jiangnan University, Wuxi 214041, China
| | - Feng-Lai Yuan
- Wuxi Clinical Medicine School of Integrated Chinese and Western Medicine, Nanjing University of Chinese Medicine, Wuxi 214041, China
- Department of Burns and Plastic Surgery, the Affiliated Hospital of Jiangnan University, Wuxi 214041, China
- Correspondence: ; Tel./Fax: +86-510-82603332
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Gong CS, Li YZ, Yang RZ, Chen MN, Qiu HL, Jiang JD, Zheng XC, Lin CZ. Impact of Intraoperative Hemodynamic Fluctuation on Postoperative Complications in Patients With Pheochromocytoma and Paraganglioma Surgery. Am J Hypertens 2022. [DOI: 10.1093/ajh/hpac038] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Abstract
Background
To identify the effect of hemodynamic fluctuations on severe postoperative complications in patients undergoing surgery for pheochromocytoma and paraganglioma (PPGL).
Methods
Patients with PPGL confirmed by postoperative pathologic examination in Fujian Provincial Hospital from January 2015 to January 2021 were enrolled. Demographic characteristics, comorbidities, preoperative examinations, preoperative preparation, intraoperative data, and postoperative complications were collected. Receiver operating characteristic curve was used to calculate the cutoff point of intraoperative standard deviation of systolic blood pressure for prediction of severe postoperative complication. According to the cutoff point, patients were divided into fluctuation and nonsevere fluctuation groups. Incidence of postoperative complication, intensive care unit (ICU) admission, length of stay after the operation, and length of ICU stay between the 2 groups was compared. The cumulative incidence and hazard ratio of postoperative complications were evaluated by Kaplan�Meier method and Cox regression analysis.
Results
A total of 126 patients were included in the study with 41 and 85 cases in the severe fluctuation and nonsevere fluctuation groups, respectively. Compared with the nonsevere fluctuation group, the incidence of postoperative complications (58.5% vs. 16.5%, P < 0.001), ICU admission rate (26.8% vs. 10.6%, P = 0.019), postoperative hospital stay, and ICU stay (P < 0.05) were higher in the severe fluctuation group. The Kaplan–Meier curve showed a higher incidence of postoperative complications in patients with severe blood pressure fluctuations (P < 0.05). The Cox regression analysis also showed that patients in the severe fluctuation group were more susceptible to postoperative complications (hazard ratio = 3.010, 95% confidence interval 1.334–6.806).
Conclusions
For patients with PPGL, the intraoperative hemodynamic fluctuations are associated with an increased risk of severe postoperative complications.
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Affiliation(s)
- Can-Sheng Gong
- Shengli Clinical College of Fujian Medical University, Department of Anesthesiology of Fujian Provincial Hospital , Fuzhou, Fujian , China
| | - Yan-Zhen Li
- Department of Anesthesiology, First Affiliated Hospital of Fujian Medical University , Fuzhou, Fujian , China
| | - Rui-Zhi Yang
- Department of Anesthesiology, First Affiliated Hospital of Fujian Medical University , Fuzhou, Fujian , China
| | - Meng-Nan Chen
- Shengli Clinical College of Fujian Medical University, Department of Anesthesiology of Fujian Provincial Hospital , Fuzhou, Fujian , China
| | - Hang-Ling Qiu
- Department of Anesthesiology, Jianou Hospital of Integrated Traditional Chinese and Western Medicine , Nanping, Fujian , China
| | - Jun-Dan Jiang
- Shengli Clinical College of Fujian Medical University, Department of Anesthesiology of Fujian Provincial Hospital , Fuzhou, Fujian , China
| | - Xiao-Chun Zheng
- Shengli Clinical College of Fujian Medical University, Department of Anesthesiology of Fujian Provincial Hospital , Fuzhou, Fujian , China
| | - Cai-Zhu Lin
- Department of Anesthesiology, First Affiliated Hospital of Fujian Medical University , Fuzhou, Fujian , China
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Di JQ, Chen MN, Zhao AD, Zhang ZH. Visible Light Mediated, Catalyst Free, One-Pot Convenient Synthesis of
Dihydropyridines. LETT ORG CHEM 2022. [DOI: 10.2174/1570178618666210125162342] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
:
A simple, efficient and green protocol has been developed for the synthesis of polysubstituted dihydropyridines
via one-pot, four-component reaction of aldehydes, arylamines, dialkyl acetylenedicarboxylate, and malononitrile. The reaction was proceeded at room temperature in the absence of catalyst in aqueous ethyl lactate under visible light irradiation.
The main advantages of the present approach are mild reaction condition, high yield, no column chromatography, clean
reaction profile, environmentally friendly and sustainable from the economic point of view
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Affiliation(s)
- Jia-Qi Di
- National Demonstration Center for Experimental Chemistry Education, Hebei Key Laboratory of Organic Functional
Molecules, College of Chemistry and Material Science, Hebei Normal University, Shijiazhuang 050024, P. R. China
| | - Meng-Nan Chen
- National Demonstration Center for Experimental Chemistry Education, Hebei Key Laboratory of Organic Functional
Molecules, College of Chemistry and Material Science, Hebei Normal University, Shijiazhuang 050024, P. R. China
| | - Ai-Dong Zhao
- Analysis and Testing Center, Hebei Normal University, Shijiazhuang 050024, P. R. China
| | - Zhan-Hui Zhang
- National Demonstration Center for Experimental Chemistry Education, Hebei Key Laboratory of Organic Functional
Molecules, College of Chemistry and Material Science, Hebei Normal University, Shijiazhuang 050024, P. R. China
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Huang HR, Dong Y, Deng Y, Xu YC, Chen MN, Liu Y, Zhang CL. [Analysis of lactate dehydrogenase gene polymorphisms and prediction of B cell epitopes in four human Plasmodium species]. Zhongguo Xue Xi Chong Bing Fang Zhi Za Zhi 2022; 34:28-35. [PMID: 35266354 DOI: 10.16250/j.32.1374.2021026] [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: 06/14/2023]
Abstract
OBJECTIVE To analyze the polymorphism of Plasmodium lactate dehydrogenase (pLDH) gene and predict B-cell epitopes in pLDH peptides in four species of human malaria parasites. METHODS The blood samples and epidemiological characteristics were collected from malaria cases in Yunnan Province registered in the National Notifiable Disease Report System. The pLDH genes of four human Plasmodium species were amplified using nested PCR assay and sequenced. The polymorphisms of pLDH genes was analyzed using the software MEGA version 7.0.26 and DnaSP version 5.10, and the B-cell epitopes were predicted in pLDH peptides using the Immune Epitope Database (IEDB). RESULTS The sequences of P. vivax LDH (PvLDH), P. falciparum LDH (PfLDH), P. ovale LDH (PoLDH) and P. malariae LDH (PmLDH) genes were obtained from 153, 29, 17 and 11 blood samples from patients with P. vivax, P. falciparum, P. ovale and P. malariae malaria, respectively, which included 15, 2, 4 and 2 haplotypes and had a nucleotide diversity (π) of 0.104. A high level of intra-species differentiation was seen in the PoLDH gene (π = 0.012), and the π values were all < 0.001 for PvLDH, PfLDH and PmLDH genes. Active regions of B-cell antigen were predicted in the pLDH peptide chain of four human malaria parasites, of 4 to 5 in each chain, and the activity score was approximately 0.430. Among these peptide chains, the "86-PGKSDKEWNRD-96" short-peptide was a B-cell epitope shared by all four species of human malaria parasites, and the "266-GQYGHS (T)-271" short-peptide was present in PvLDH and PoLDH peptide chains, while "212-EEVEGIFDR-220" was only found in the PvLDH peptide chain, and "208-LISDAE-213" was only seen in the PfLDH peptide chain. CONCLUSIONS The PoLDH gene polymorphism may be derived from the weak negative purification selection, while PvLDH, PfLDH and PmLDH genes may maintain a relatively conservative state. There may be two B-cell epitopes "212-EEVEGIFDR-220" and "208-LISDAE-213" in the proximal region of the C terminal in the pLDH peptide chain, which is feasible to differentiate between P. vivax and P. falciparum infections.
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Affiliation(s)
- H R Huang
- Department of Basic Medical Sciences, Clinical College of Anhui Medical University, Hefei, Anhui 230031, China
| | - Y Dong
- Yunnan Institute of Parasitic Diseases Control, Yunnan Centre of Malaria Research, Yunnan Provincial Key Laboratory of Vector-borne Diseases Control and Research, Pu'er, Yunnan 665000, China
| | - Y Deng
- Yunnan Institute of Parasitic Diseases Control, Yunnan Centre of Malaria Research, Yunnan Provincial Key Laboratory of Vector-borne Diseases Control and Research, Pu'er, Yunnan 665000, China
| | - Y C Xu
- Yunnan Institute of Parasitic Diseases Control, Yunnan Centre of Malaria Research, Yunnan Provincial Key Laboratory of Vector-borne Diseases Control and Research, Pu'er, Yunnan 665000, China
| | - M N Chen
- Yunnan Institute of Parasitic Diseases Control, Yunnan Centre of Malaria Research, Yunnan Provincial Key Laboratory of Vector-borne Diseases Control and Research, Pu'er, Yunnan 665000, China
| | - Y Liu
- Yunnan Institute of Parasitic Diseases Control, Yunnan Centre of Malaria Research, Yunnan Provincial Key Laboratory of Vector-borne Diseases Control and Research, Pu'er, Yunnan 665000, China
| | - C L Zhang
- Yunnan Institute of Parasitic Diseases Control, Yunnan Centre of Malaria Research, Yunnan Provincial Key Laboratory of Vector-borne Diseases Control and Research, Pu'er, Yunnan 665000, China
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Wang X, Ding Y, Chen MN, Siu ZB, Jalil MBA, Li Y. Giant anisotropic photocurrent modulated by strain in Weyl semimetal T d-MoTe 2. Opt Lett 2022; 47:906-909. [PMID: 35167555 DOI: 10.1364/ol.448086] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/12/2021] [Accepted: 01/07/2022] [Indexed: 06/14/2023]
Abstract
We built a Cu-MoTe2-Cu device model and used first-principles density functional theory to study the transport properties of the Td-MoTe2 heterojunction. We obtained the effect of strain on the energy band structure of the bulk Td-MoTe2, the transport properties, and photocurrent of the Cu-MoTe2-Cu device. The strain-induced photocurrent shows an anisotropy that reflects the modulation of the energy bands, including the Weyl point, by strain. The photocurrent can be suppressed to almost zero when the strain is applied along the vacuum direction. In contrast, the photocurrent can be significantly increased when the strain is applied along the transport direction. The transport properties and magnitude of the photocurrent in the MoTe2-based device can be effectively modulated by adjusting the strength and direction of the strain.
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Chen MN, Chen WC, Zhou Y. Topological hybrid semimetal phases and anomalous Hall effects in a three dimensional magnetic topological insulator. J Phys Condens Matter 2021; 34:025502. [PMID: 34636339 DOI: 10.1088/1361-648x/ac2ed7] [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] [Subscribe] [Scholar Register] [Received: 08/20/2021] [Accepted: 10/11/2021] [Indexed: 06/13/2023]
Abstract
In this work, we propose a ferromagnetic Bi2Se3as a candidate to hold the coexistence of Weyl- and nodal-line semimetal phases, which breaks the time reversal symmetry. We demonstrate that the type-I Weyl semimetal phase, type-I-, type-II- and their hybrid nodal-line semimetal phases can arise by tuning the Zeeman exchange field strength and the Fermi velocity. Their topological responses under U(1) gauge field are also discussed. Our results raise a new way for realizing Weyl and nodal-line semimetals and will be helpful in understanding the topological transport phenomena in three-dimensional material systems.
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Affiliation(s)
- M N Chen
- School of Science, Hangzhou Dianzi University, Hangzhou, 310018, People's Republic of China
| | - W C Chen
- Institute of Advanced Magnetic Materials, College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou, 310018, People's Republic of China
| | - Yu Zhou
- School of Science, Hangzhou Dianzi University, Hangzhou, 310018, People's Republic of China
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Zhang M, Chen MN, Li JM, Liu N, Zhang ZH. Visible-Light-Initiated One-Pot, Three-Component Synthesis of 2-Amino-4 H-pyran-3,5-dicarbonitrile Derivatives. ACS Comb Sci 2019; 21:685-691. [PMID: 31433619 DOI: 10.1021/acscombsci.9b00124] [Citation(s) in RCA: 32] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
A novel approach for the visible-light-initiated synthesis of 2-amino-4H-pyran-3,5-dicarbonitrile derivatives via a one-pot, three-component reaction of aldehydes or isatins, malononitrile, and α-cyano ketones has been developed. The reaction was carried out at room temperature in ethanol/water to give the corresponding products with a wide range of functional groups in high yields. This process did not require any additives or chromatographic separation and could be applied for gram-scale synthesis.
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Affiliation(s)
- Mo Zhang
- National Demonstration Center for Experimental Chemistry Education, Hebei Key Laboratory of Organic Functional Molecules, College of Chemistry and Material Science, Hebei Normal University, No. 20 South Second Ring East Road, Shijiazhuang 050024, P. R. China
| | - Meng-Nan Chen
- National Demonstration Center for Experimental Chemistry Education, Hebei Key Laboratory of Organic Functional Molecules, College of Chemistry and Material Science, Hebei Normal University, No. 20 South Second Ring East Road, Shijiazhuang 050024, P. R. China
| | - Jiao-Mian Li
- National Demonstration Center for Experimental Chemistry Education, Hebei Key Laboratory of Organic Functional Molecules, College of Chemistry and Material Science, Hebei Normal University, No. 20 South Second Ring East Road, Shijiazhuang 050024, P. R. China
| | - Nan Liu
- National Demonstration Center for Experimental Chemistry Education, Hebei Key Laboratory of Organic Functional Molecules, College of Chemistry and Material Science, Hebei Normal University, No. 20 South Second Ring East Road, Shijiazhuang 050024, P. R. China
| | - Zhan-Hui Zhang
- National Demonstration Center for Experimental Chemistry Education, Hebei Key Laboratory of Organic Functional Molecules, College of Chemistry and Material Science, Hebei Normal University, No. 20 South Second Ring East Road, Shijiazhuang 050024, P. R. China
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Chen MN, Ho KY, Hung YN, Su CC, Kuan CH, Tai HC, Cheng NC, Lin CC. Pre-treatment quality of life as a predictor of distant metastasis-free survival and overall survival in patients with head and neck cancer who underwent free flap reconstruction. Eur J Oncol Nurs 2019; 41:1-6. [PMID: 31358241 DOI: 10.1016/j.ejon.2019.05.003] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2018] [Revised: 05/14/2019] [Accepted: 05/14/2019] [Indexed: 12/22/2022]
Abstract
PURPOSE This study examined the prognostic associations of pre-treatment quality of life (QoL) with overall survival (OS) and distant metastasis-free survival (DFMS) among patients with head and neck cancer (HNC) who underwent free flap reconstruction. METHODS A cohort of 127 HNC patients who received free flap reconstruction between November 2010 and June 2014 at a hospital were recruited. Pre-treatment QoL was measured by the University of Washington Quality of Life Questionnaire, which contains six physical domains, including speech, swallowing, appearance, saliva, taste and chewing, as well as the six social-emotional domains of pain, activity, recreation, shoulder, mood, and anxiety. Cox regression analyses were performed. RESULTS Results showed that pre-treatment QoL was predictive of OS and DMFS. Of the domains, swallowing, chewing, speech, taste, saliva, pain and shoulder were demonstrated to be significant predictors of OS. Additionally, swallowing, chewing, speech, pain and activity were demonstrated making significant contributions to DMFS. CONCLUSION Our data supported that physical domains of pre-treatment QoL were predictors for OS and DFMS in HNC patients with free-flap reconstruction. Longitudinal studies are warranted to clarify the prognostic abilities of social-emotional domains. Information on pre-treatment QoL should be taken into account to individualize care plan for these patients, and hence prolong their survival.
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Affiliation(s)
- M N Chen
- Department of Nursing, National Taiwan University Hospital, Taipei, Taiwan; School of Nursing, College of Nursing, Taipei Medical University, Taipei, Taiwan.
| | - K Y Ho
- School of Nursing, The University of Hong Kong, HKSAR, China.
| | - Y N Hung
- School of Gerontology and Health Management, College of Nursing, Taipei Medical University, Taipei, Taiwan.
| | - C C Su
- Department of Nursing, Chang Gung University of Science and Technology, Chiayi, Taiwan.
| | - C H Kuan
- Graduate Institute of Clinical Research, College of Medicine, National Taiwan University, Taipei, Taiwan; Division of Plastic Surgery, Department of Surgery, National Taiwan University Hospital and College of Medicine, Taipei, Taiwan.
| | - H C Tai
- Division of Plastic Surgery, Department of Surgery, National Taiwan University Hospital and College of Medicine, Taipei, Taiwan.
| | - N C Cheng
- Division of Plastic Surgery, Department of Surgery, National Taiwan University Hospital and College of Medicine, Taipei, Taiwan.
| | - C C Lin
- School of Nursing, College of Nursing, Taipei Medical University, Taipei, Taiwan; School of Nursing, The University of Hong Kong, HKSAR, China; Alice Ho Miu Ling Nethersole Charity Foundation Professor in Nursing, Hong Kong.
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Zhang WH, Chen MN, Hao Y, Jiang X, Zhou XL, Zhang ZH. Choline chloride and lactic acid: A natural deep eutectic solvent for one-pot rapid construction of spiro[indoline-3,4′-pyrazolo[3,4-b]pyridines]. J Mol Liq 2019. [DOI: 10.1016/j.molliq.2019.01.065] [Citation(s) in RCA: 47] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
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Affiliation(s)
- Ge Gao
- National Demonstration Center for Experimental Chemistry Education, College of Chemistry and Material Science, Hebei Normal University, Shijiazhuang, China
| | - Meng-Nan Chen
- National Demonstration Center for Experimental Chemistry Education, College of Chemistry and Material Science, Hebei Normal University, Shijiazhuang, China
| | - Li-Ping Mo
- National Demonstration Center for Experimental Chemistry Education, College of Chemistry and Material Science, Hebei Normal University, Shijiazhuang, China
| | - Zhan-Hui Zhang
- National Demonstration Center for Experimental Chemistry Education, College of Chemistry and Material Science, Hebei Normal University, Shijiazhuang, China
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Chen MN, Mei F, Su W, Wang HQ, Zhu SL, Sheng L, Xing DY. Topological phases of the kicked Harper-Kitaev model with ultracold atoms. J Phys Condens Matter 2017; 29:035601. [PMID: 27845928 DOI: 10.1088/0953-8984/29/3/035601] [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] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
We propose using ultracold atoms trapped in a one-dimensional periodically driven optical lattice to realize the Harper-Kitaev model, where the on-site energies are periodically kicked. Such a system provides a natural platform to study both Chern insulators and Majorana fermions. Based on calculating the quasienergy spectra, we find that both Floquet Majorana modes and Hall chiral edge modes could appear at the sample boundary in the gaps between the quasienergy bands. We also study the competition of topological superconductor and Chern insulator states in the model. We calculate the [Formula: see text] index and Floquet Chern number to characterize the above two different topological states, including the topological phase transitions in the kicked Harper-Kitaev model with the increase in the strength of the kick.
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Affiliation(s)
- M N Chen
- National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, People's Republic of China
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Chen MN, Wang P, Zhang J, Zhou BY, Mao Q, Liu YH. Analysis of the role of hMLH1 hypermethylation and microsatellite instability in meningioma progression. Genet Mol Res 2012; 11:3933-41. [PMID: 22930430 DOI: 10.4238/2012.august.17.7] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
We investigated a possible role of hMLH1 hypermethylation and microsatellite instability in meningioma progression. Fifty meningomas were examined for methylation of hMLH1 using a methylation-specific PCR; 43 of them were analyzed for microsatellite instability using nine microsatellite markers. Loss of heterozygosity on chromosome 22q was detected using two markers. Two atypical meningiomas showed microsatellite instability at four loci; one was methylated on hMLH1 and the other was unmethylated. Nine meningiomas were found to have methylated hMLH1; the frequencies in the different grades of meningioma were one of 20, two of 16, and six of 14, respectively. We concluded that the methylation status of hMLH1 is associated with the meningioma grade but not with microsatellite instability. Loss of heterozygosity was detected in 22 cases in at least one marker. The frequency of loss of heterozygosity increased with meningioma grade, but the tendency was not significant. The correlation between loss of heterozygosity and methylation of the hMLH1 gene was also not significant. We conclude that hypermethylation of the promoter of hMLH1 is an epigenetic change in meningiomas and is associated with the tumor grade, while microsatellite instability is an uncommon event in meningiomas.
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Affiliation(s)
- M N Chen
- The State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu, China
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Wang SJ, Lin WY, Chen MN, Chen JT, Ho WL, Hsieh BT, Huang H, Shen LH, Ting G, Knapp FF. Histologic study of effects of radiation synovectomy with Rhenium-188 microsphere. Nucl Med Biol 2001; 28:727-32. [PMID: 11518655 DOI: 10.1016/s0969-8051(01)00228-1] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.2] [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: 11/17/2022]
Abstract
Rhenium-188 microsphere is a relatively new radiation synovectomy agent developed for the treatment of rheumatoid arthritis. It has been shown that the levels of unwanted extra-articular radiation are negligible with this agent. A histologic study was conducted to assess the effect of radiation synovectomy on synovium and articular cartilage after intra-articular injection of various doses of Re-188 microspheres into the knee joints of rabbits. Intra-articular injection of Re-188 microspheres into rabbit knee joints resulted in mild reactive inflammation and thrombotic occlusion of vessels which subsided rapidly. Sclerosis of subsynovium could be seen 12 weeks after injection. No evidence of damage to articular cartilage was noted. There was no significant difference in the articular pattern after injection of 0.3 or 0.6 mCi Re-188 microspheres. This study suggests that a treatment dose of Re-188 microspheres causes transient inflammation of synovium without any detectable damage to the articular cartilage of knee joint.
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Affiliation(s)
- S J Wang
- Department of Nuclear Medicine, Veterans General Hospital, Taichung and National Yang-Ming University, 160 Taichung Harbor Road, Section 3, 40705, Taichung, Taiwan.
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Bogsrud TV, Chen MN, Herold TJ, Mahoney DW, Hung JC. Effects of alternative reconstitution procedures on the labelling efficiency and in vitro stability of 99Tcm-labelled radiopharmaceuticals. Nucl Med Commun 1999; 20:61-5. [PMID: 9949414 DOI: 10.1097/00006231-199901000-00010] [Citation(s) in RCA: 2] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Adding normal saline (NS) separately before 99Tcm-sodium pertechnetate to MDP cold kits has been shown to reduce substantially the radiation dose to the hand. A similar dose reduction will probably prove to be valid with the preparation of most other 99Tcm-labelled radiopharmaceuticals. However, it is unknown how this altered reconstitution procedure may affect the labelling efficiency and in vitro stability of the 99Tcm-labelled radiopharmaceuticals. We have evaluated the effects on the labelling efficiency and in vitro stability of 99Tcm-labelled MDP, mertiatide and sestamibi reconstituted with three different methods: adding normal saline before 99Tcm activity (NS/Tc); adding 99Tcm activity before normal saline (Tc/NS); and the standard reconstitution method of adding both 99Tcm activity and normal saline together. The labelling efficiency and in vitro stability were evaluated by measuring the radiochemical purity of each radiopharmaceutical tested at 0, 1, 3, 6, 12 (except 99Tcm-MDP) and 24 h after reconstitution. For 99Tc-mertiatide, there was a very slight difference in the labelling efficiency, mostly due to the Tc/NS method being approximately 0.29% lower across time post-reconstitution than the standard method. For 99Tcm-labelled MDP and sestamibi, there were no differences between the three methods in terms of labelling efficiency and in vitro stability. In conclusion, both alternative methods (i.e. NS/Tc and Tc/NS) appear not to have any detrimental effect on the labelling efficiency and in vitro stability of the 99Tcm-labelled radiopharmaceuticals that we tested. However, of the two alternative kit reconstitution methods, we recommend the NS/Tc method, since it may reduce the hand radiation dose.
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Affiliation(s)
- T V Bogsrud
- Department of Diagnostic Radiology, Mayo Clinic, Rochester, MN 55905, USA
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Wang SJ, Lin WY, Chen MN, Chi CS, Chen JT, Ho WL, Hsieh BT, Shen LH, Tsai ZT, Ting G, Mirzadeh S, Knapp FF. Intratumoral injection of rhenium-188 microspheres into an animal model of hepatoma. J Nucl Med 1998; 39:1752-7. [PMID: 9776282] [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: 02/09/2023] Open
Abstract
UNLABELLED Intratumoral injection of 90Y microspheres is a potential alternative in the treatment of primary liver tumor. However, complicated preparation and lack of a gamma ray for imaging are the disadvantages of 90Y. In this study, we used 188Re, a generator-produced radioisotope with 155-keV gamma ray emission, to label microspheres. After intratumoral injection of 188Re microspheres into rats with hepatoma, biodistributions and survival times were analyzed. METHODS Twelve male rats with hepatoma were killed at 1, 24 and 48 hr (4 rats at each time point) after intratumoral injection of approximately 7.4 MBq 188Re microspheres. Samples of various organs were obtained and used to calculate the tissue concentrations. In addition, 30 male rats bearing hepatoma were divided into two groups (15 rats in each group) to evaluate survival time. Group 1 received intratumoral injection of 37 MBq 188Re microspheres, whereas Group 2 served as the control group and received an intratumoral injection of 0.1 ml normal saline only. Survival time was calculated from the day of injection to 2 mo after treatment. RESULTS Radioactivity in the tumor was very high throughout. Biological half-time was 170.8 hr. Radioactivity in the lung was 1.78% injected dose (i.d.)/g at 1 hr but declined rapidly over time. The concentration in the urine was approximately 6.14% i.d./ml after the first hour and rapidly declined thereafter. The concentrations of radioactivity in other organs, such as normal liver, muscle, spleen, bone, testis and whole blood, were quite low throughout the study. Twelve of 15 (80%) of rats survived over 60 days after intratumoral injection of 188Re microspheres, whereas only 4 of 15 (26.7%) survived more than 60 days after injection of normal saline only. The difference between the groups was significant (p < 0.05). CONCLUSION Rhenium-188 offers cost-effectiveness, on-site availability, short half-life, energetic beta particle, emission of gamma photons for imaging, easy preparation, easy clinical administration and apparent lack of radiation leakage from the treated tumor. Direct intratumoral injection of 188Re microspheres is extremely attractive as a clinical therapeutic alternative in hepatoma patients.
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Affiliation(s)
- S J Wang
- Department of Nuclear Medicine, Veterans General Hospital-Taichung, Taiwan
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Wang SJ, Lin WY, Chen MN, Hsieh BT, Shen LH, Tsai ZT, Ting G, Chen JT, Ho WL, Mirzadeh S, Knapp FF. Rhenium-188 microspheres: a new radiation synovectomy agent. Nucl Med Commun 1998; 19:427-33. [PMID: 9853331 DOI: 10.1097/00006231-199805000-00004] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.2] [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: 11/26/2022]
Abstract
Radiation synovectomy is efficacious in controlling the symptoms of rheumatoid arthritis. However, the procedure is not widely used because of concerns about leakage of radiopharmaceuticals from the treated joints. Leakage can be minimized by selecting particles of an appropriate size. In this study, we labelled microspheres with 188Re and analysed its biodistribution after intra-articular injection in rabbits with antigen-induced arthritis. Gamma camera imaging was performed to quantify the mean retention of 188Re in the knees. The mean retention of 188Re was 98.7, 94.6 and 93.6% at 1, 24 and 48 h, respectively. The biodistribution data revealed very low radioactivity in all organs at different times, which suggests the leakage of radiotracer from the knee was negligible. Our preliminary results indicate that 188Re microspheres are a potentially effective radiopharmaceutical for radiation synovectomy.
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Affiliation(s)
- S J Wang
- Department of Nuclear Medicine, Veterans General Hospital, Taichung and National Yang-Ming University, Taipei, Taiwan
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Wang SJ, Lin WY, Chen MN, Hsieh BT, Shen LH, Tsai ZT, Ting G, Knapp FF. Radiolabelling of Lipiodol with generator-produced 188Re for hepatic tumor therapy. Appl Radiat Isot 1996; 47:267-71. [PMID: 8935963 DOI: 10.1016/0969-8043(95)00300-2] [Citation(s) in RCA: 26] [Impact Index Per Article: 0.9] [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: 02/03/2023]
Abstract
In this study we prepared and analyzed the biodistribution of 188Re-labelled Lipiodol ([188Re]-Lipiodol) in rats after intrahepatic arterial injection. EDTB was synthesized by condensation of 1,2-benzenediamine and ethylenediaminetetraacetic acid (EDTA). The labelling efficiency of [188Re] Lipiodol was determined to be greater than 97% by ITLC developed with n-hexane. Following incubation of the [188Re] Lipiodol with an equal volume of serum at 37 degrees C for 48 h, ITLC indicated good in vitro stability. Approximately 7.4 MBq [188Re] Lipiodol was injected in each rat via the hepatic artery and samples of liver, spleen, muscle, lung, kidney, bone, whole blood and testis were obtained. [188Re] Lipiodol tissue concentrations showed that after 1 h intrahepatic injection most of the radiotracer was retained in the liver, and was eliminated slowly with a biological half-life of 33.5 h. Radioactvity levels in the lung, kidney and blood were moderate at 1 h, and declined rapidly over time. In the spleen, muscle, testis and bone, radiation levels were insignificant. These initial results indicate that -188Re- Lipiodol may be a potential radiopharmaceutical agent for the treatment of liver tumors.
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Affiliation(s)
- S J Wang
- Department of Nuclear Medicine, Veterans General Hospital-Taichung, Taiwan
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Wang SJ, Lin WY, Lui WY, Chen MN, Tsai ZT, Ting G. Hepatic artery injection of Yttrium-90-lipiodol: biodistribution in rats with hepatoma. J Nucl Med 1996; 37:332-5. [PMID: 8667072] [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: 02/01/2023] Open
Abstract
UNLABELLED In this study, we analyzed the biodistribution of 90Y-lipiodol in rats with liver tumors (hepatoma) following hepatic arterial injection. METHODS Sixteen male Sprague-Dawley rats with liver tumors were killed at 1, 24, 48 and 72 hr (four rats at each time) after injection of approximately 0.1 mCi 90Y-lipiodol through the hepatic artery, respectively. Samples of tumor, liver, spleen, skeletal muscle, lung, kidney, bone, whole blood and testis were obtained and counted to calculate the tissue concentrations (%ID/g). RESULTS We found that the radioactivity in the liver tumor was high at 1 and 24 hr and then declined slowly. The biological half-time was 84.1 hr. The radioactivity in normal liver tissue was also high at 1 hr but was significantly lower than that in the tumor. The biological half-time was 38.5 hr. The ratio of tissue concentration between liver tumor and normal liver tissue (T/N ratio) was 3.03 at 1 hr and rose to 6.45 at 72 hr. The radioactivity in the lung was almost as high as in normal liver tissue at 1 hr and declined rapidly with a biological half-time of 25.6 hr. The activity levels of the kidney were moderate at 1 hr and remained at almost the same level throughout the study. A moderate concentration of radioactivity in bone was noted within the first 24 hr. The concentration, however, rose over the ensuing time. The concentration of radioactivity in skeletal muscle, spleen, testis and whole blood was quite low. CONCLUSION Following hepatic arterial injection of 90Y-lipiodol, tracer uptake in liver tumor was high and tumor retention was lengthy. Consequently, large radiation doses could be delivered to the tumor. We suggest that 90Y-lipiodol is a potential agent in the treatment of liver malignancy.
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Affiliation(s)
- S J Wang
- Department of Nuclear Medicine, Veterans General Hospital, Taichung, Taiwan, Republic of China
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Wang SJ, Lin WY, Chen MN, Hsieh BT, Shen LH, Tsai ZT, Ting G, Knapp FF. Biodistribution of rhenium-188 Lipiodol infused via the hepatic artery of rats with hepatic tumours. Eur J Nucl Med 1996; 23:13-7. [PMID: 8586096 DOI: 10.1007/bf01736984] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
The purpose of this study was to analyse the biodistribution of rhenium-188 Lipiodol in rats with hepatic tumours following intrahepatic arterial injection to assess the potential of 188Re-Lipiodol as a radiopharmaceutical for the treatment of hepatic tumours in humans. Twelve male rats with hepatic tumours were killed at 1h, 24h and 48h after injection of approximately 7.4MBq of 188Re-Lipiodol via the hepatic artery. Samples of various organs were obtained and counted to calculate the tissue concentration. Radioactivity in the hepatic tumours was very high throughout this study, with a biological half-life of 122.9h. Radioactivity in the normal liver tissue was also high, but was significantly lower than in the tumour. The biological half-life in the normal liver tissue was 31.7h. The ratio of tumour concentration to the normal liver tissue concentration was 5.15 at 1h and rose to 7.7 at 24h and 10.84 at 48h. The level of radioactivity in the lung was high at 1h, and declined rapidly over time. The level of radioactivity in the kidney was moderate throughout the study. The radiation concentrations in muscle, spleen, testis, bone and whole blood were insignificant. We conclude that 188Re-Lipiodol should be considered as a potential radiopharmaceutical for the intra-arterial treatment of hepatic tumours.
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Affiliation(s)
- S J Wang
- Department of Nuclear Medicine, Veterans General Hospital-Taichung, 160, Sec. 3, Taichung Harbor Road, Taichung 407, Taiwan
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Wang SJ, Lin WY, Chen MN, Shen LH, Tsai ZT, Ting G. Preparation and biodistribution of yttrium-90 Lipiodol in rats following hepatic arterial injection. Eur J Nucl Med 1995; 22:233-6. [PMID: 7789396 DOI: 10.1007/bf01081518] [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] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
In this study, we labelled Lipiodol with yttrium-90 and analysed the biodistribution in rats after intrahepatic arterial injection. An RP-18 column (E. Merck) was used to separate 90Y from strontium-90. 90Y was retained on the column, which had been pretreated with yttrium-selective extraction reagent, di(2-ethylhexyl) phosphate, while 90Sr was washed out. A hexadentate nitrogen-donor chelating ligand N,N,N',N'-tetrakis(2-benzymidazolylmethyl)-1,2-ethanediamine (EDTB) was synthesized by condensation of 1,2-benzenediamine and ethylene diamine tetra-acetic acid (EDTA). Lipiodol was covalently conjugated with EDTB. The final product was obtained by eluting the retained 90Y from the RP-18 column with EDTB-Lipiodol. Sixteen male rats (Sprague-Dawley) were sacrificed at 1 h, 24 h, 48 h and 72 h (four rats at each time) after injection of approximately 0.1 mCi 90Y-Lipiodol via the hepatic artery. Samples of liver, spleen, muscle, lung, kidney, bone, whole blood and testis were obtained and counted to calculate the tissue concentrations. In addition, labelling efficiency and in vitro stability were determined by ITLC methods. We found that at 1 h after intrahepatic injection, most of the radiotracer was retained in the liver, but it was eliminated gradually over a few days. The radioactivity level in the lung was fair at 1 h and remained at roughly the same level throughout the study. Radioactivity in the kidney and spleen reached a relatively high level at 24 h, but declined rapidly.(ABSTRACT TRUNCATED AT 250 WORDS)
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Affiliation(s)
- S J Wang
- Department of Nuclear Medicine, Veterans General Hospital-Taichung, National Yang-Ming Medical College Taipei, Taiwan
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Abstract
A 78-year-old female presented with swelling and severe pain in the left forehead secondary to a simple head injury received 1 month previously. On admission, neurological examination was normal. Plain skull x-ray films and computed tomography showed an osteolytic and well-defined mass in the left frontal bone. Bone scintigraphy showed high-uptake areas in the right lower ribs and fifth lumbar vertebra. Blood tests showed slight liver dysfunction and a high alpha-fetoprotein level. Abdominal computed tomography showed a huge mass within the liver. Left common carotid angiography disclosed the enlargement of several feeding arteries arising from the external carotid artery with tumor staining. The bone tumor was removed for histological diagnosis and to reduce the localized pain. The histological diagnosis was a cranial metastasis from hepatocellular carcinoma. She died of ruptured varicose veins of the esophagus approximately 8 months after surgery. Surgery for cranial metastasis from hepatic cancer is only indicated when localized pain or hemorrhage threaten the quality of life.
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Affiliation(s)
- D Yoshida
- Department of Neurosurgery, Nippon Medical School, Tokyo
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Wang SJ, Lin WY, Kao CH, Hsu CY, Lee TW, Chen MN, Ting G, Shen LH. Evaluation of various methods of 99Tcm-human immunoglobulin preparation in scintigraphic detection of infection. Nucl Med Commun 1993; 14:1030-4. [PMID: 8290159 DOI: 10.1097/00006231-199311000-00015] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Radiolabelled human immunoglobulin (HIG) scintigraphy has been recognized as a reliable modality for the localization and evaluation of pyogenic infection in humans. Four methods of labelling HIG with 99Tcm developed by the Institute of Nuclear Energy Research of Taiwan are: (1) using ascorbic acid (ASC) for direct labelling of HIG (ASC-HIG); (2) using diethylenetriamine pentaacetate (DTPA) as a bifunctional chelate (DTPA-HIG); (3) using 2-iminothiolane (IM) for modified protein (IM-HIG); (4) using the avidin-biotin system (AVI-BIO-HIG). Our study assessed these four preparations in the scintigraphic detection of infections. Staphylococcus aureus was injected intramuscularly into the left thighs of rabbits. Two days later, when active inflammation developed, 5 mCi 99Tcm-HIG was given intravenously; scintigraphy was performed at 1, 4 and 18 h. The accumulation of 99Tcm DTPA-HIG was the most prominent among the four preparations at the site of infection. It is concluded that 99Tcm labelling of HIG using DTPA as a bifunctional chelate may be the optimal labelling method for detecting infection.
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Affiliation(s)
- S J Wang
- Department of Nuclear Medicine, Veterans General Hospital, Taichung, Taiwan
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Chen MN, Nakazawa S, Hori M. [A case of primary intracranial choriocarcinoma with a carotid-cavernous fistula]. No Shinkei Geka 1993; 21:1031-4. [PMID: 8255378] [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: 01/29/2023]
Abstract
A 14-year-old Japanese girl was admitted to Kosei General Hospital on May 28, 1987 because of disturbance of visual acuity, bitemporal hemianopsia and general fatigue. About two months before, she had noticed disturbance of visual acuity and headache. The CT scans demonstrated iso density mass in the chiasmatic region with ring enhancement. Bilateral carotid angiograms showed bilateral carotid-cavernous fistulas. The serum HCG rose to 13000 IU/ml (HCG-beta, 480 ng/ml) whereas the urinary level was 2200 mIU/ml and alpha-feto protein was normal. A diagnosis of choriocarcinoma was made. Radiation therapy and combined chemotherapy (cisplatinum, vinblastine, bleomycin) were begun. But radiation and chemotherapy had little effect. On June 12, 1987, chest X-ray film showed several abnormal shadows in both lungs, and her general condition continued to deteriorate. She died on June 21, 1987. Histologic examination of the tumor disclosed cytotrophoblastic cells and syncytiotrophoblastic cells with extensive hemorrhage and necrosis. Extracranial metastasis was found only in both lungs.
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Affiliation(s)
- M N Chen
- Department of Neurosurgery, Kosei General Hospital
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31
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Adachi K, Kudo M, Chen MN, Nakazawa S, Wakabayashi I. Cerebral aneurysm associated with multiple endocrine neoplasia, type 1--case report. Neurol Med Chir (Tokyo) 1993; 33:309-11. [PMID: 7687038 DOI: 10.2176/nmc.33.309] [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: 01/26/2023] Open
Abstract
Cerebral aneurysm associated with pituitary adenoma and other endocrine dysfunctions occurred in a 45-year-old female suffering from multiple endocrine neoplasia, type 1 (Wermer's syndrome). She died of subarachnoid hemorrhage secondary to rupture of the aneurysm. Pituitary adenoma and/or other endocrine dysfunctions associated with multiple endocrine neoplasia, type 1 may be a factor in the aneurysm formation.
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Affiliation(s)
- K Adachi
- Department of Neurosurgery, Nippon Medical School, Tokyo
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32
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Chen MN, Imaya H, Nakazawa S. [Four cases of intracranial AVM successfully treated by radiation therapy]. No Shinkei Geka 1990; 18:1161-6. [PMID: 2126349] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
We have treated three patients with conventional radiotherapy and one with stereotactic radiosurgery and report the follow-up results. Case 1 was of a 63-year-old woman who had a dural AVM in the right cavernous sinus. She was irradiated using 10MV X-rays with a total of 30Gy. Post irradiation angiography showed a complete absence of dural AVM. Case 2 was of a 62-year-old woman who had a dural AVM fed by the left external carotid artery in the right cavernous sinus. Embolization by gelfoam was performed before irradiation. The irradiation was given with a total dose of 30Gy. Post irradiation angiography showed disappearance of the dural AVM. Case 3 was of a 26-year-old woman who had a small AVM (about 20 x 15 x 15mm) in the posterior corpus callosum. An operation was performed but the AVM was not excised completely. We irradiated the residual AVM with a total of 30Gy. The follow-up angiography one year after treatment, showed disappearance of the AVM. She had no neurological deficit two years after the treatment. Case 4 was of a 14-year-old boy who had a small AVM (about 20 x 15 x 10mm) in the left anterior wall of the fourth ventricle. The AVM was located deeply, so an operation was not performed. Radiosurgery was undertaken four months after onset in Buenos Aires. The total dose was 36Gy. The follow-up angiography one year after treatment, showed disappearance of the AVM. He also had no neurological deficit two years after the treatment.(ABSTRACT TRUNCATED AT 250 WORDS)
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Affiliation(s)
- M N Chen
- Department of Neurosurgery, Kousei General Hospital
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Abstract
A case of cerebellar medulloblastoma with clusters of mature ganglion cells and glial cells is described. The patient, a 15-year-old girl, underwent three operations followed each time by radiation and chemotherapy during the four-year clinical course. Histologically, the ganglion cells were clearly identifiable by their abundant eosinophilic cytoplasm, round nuclei with prominent nucleoli, tigroid granules, and argyrophilic fibrils and axons. Immunohistochemically, the cells were NSE- and NF-positive, and ultrastructurally they contained abundant tubules and filaments, neurosecretory granules and well developed rough endoplasmic reticulum. There were many cells transitional in appearance between primitive cells and mature ganglion cells. The tumor also had many mature yet atypical astrocytes and oligodendrocytes. The exact mechanism of the extensive neuronal and glial maturation of medulloblastoma cells is unclear, but the repetitive surgical interventions, radiation and chemotherapy might have had certain cytostatic effects on rapidly dividing medulloblastoma cells, giving them a chance to mature into postmitotic cells with potential for neuronal and glial differentiation.
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Affiliation(s)
- M Kudo
- Department of Pathology, Toho University School of Medicine, Tokyo, Japan
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Imaya H, Nakazawa S, Chen MN. [A case of fibromuscular dysplasia with dissecting aneurysm of the cervical internal carotid artery]. Rinsho Hoshasen 1987; 32:335-8. [PMID: 3586365] [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]
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Chen MN, Yoshida D, Imaya H, Nakazawa S. [A study on penetration of mezlocillin into the cerebrospinal fluid]. Jpn J Antibiot 1986; 39:1234-6. [PMID: 3761553] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
The concentration of antibiotics in cerebrospinal fluid is of great interest in therapeutics, especially for the treatment of the central nervous system. We studied the penetration of mezlocillin (MZPC) in 3 cases with V-P shunt and 7 cases after neurosurgical operation. After intravenous injection of 4 g MZPC in the 3 cases with V-P shunt, a peak concentration (0.26-3.6 micrograms/ml) of MZPC in the cerebrospinal fluid was reached in 2-4 hours. In the 7 cases after neurosurgical operation, cerebrospinal fluid was sampled at 4 hours after the intravenous injection of 4 g MZPC by spinal tap. Concentrations of MZPC in cerebrospinal fluid ranged from 1.1 to 17.5 micrograms/ml. The mean maximum concentration of MZPC was 5.85 micrograms/ml, which exceeded 90% MIC (minimal inhibitory concentration) against S. epidermidis, E. faecalis, H. influenzae. It is concluded MZPC can be useful for the prophylaxis of meningitis.
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Chen MN. [Clinical, pathological and neuroradiological studies of intracranial arteriovenous malformations]. Nihon Ika Daigaku Zasshi 1984; 51:56-69. [PMID: 6725546 DOI: 10.1272/jnms1923.51.56] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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Chen MN, Yamakawa K, Nakazawa S. [A study on the penetration of Sulfamethoxazole-Trimethoprim into the cerebrospinal fluid]. Kansenshogaku Zasshi 1983; 57:148-54. [PMID: 6408197 DOI: 10.11150/kansenshogakuzasshi1970.57.148] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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Murayama K, Chen MN, Kuzuhara M, Shimura T, Yajima K, Nakazawa S. [Characteristic findings of metrizamide CT cisternography in an epidermoid in the posterior fossa (author's transl)]. Neurol Med Chir (Tokyo) 1982; 22:389-94. [PMID: 6180341 DOI: 10.2176/nmc.22.389] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023] Open
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40
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Chen MN, Nakazawa S, Ikeda Y, Tazaki H, Shimura T, Yajima K. [A case of dural AVM during pregnancy (author's transl)]. No Shinkei Geka 1982; 10:549-55. [PMID: 7110518] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
A case of dural AVM manifested during pregnancy was reported. On December 28, 1979, a 28-year-old primipara, suddenly developed headache, nausea and vomiting at the 8th month of her pregnancy and soon after became unconscious. She was transferred by ambulance to our hospital. On admission she was comatose exhibiting decerebrate rigidity. The blood pressure was 126/76 mmHg and the pulse rate 97 per minute and regular. Right pupil was dilated and did not react to light. CT scan revealed a subdural hematoma on the right side and intracerebral hematoma in the right middle fossa. Angiography demonstrated a dural AVM in the right anterior middle fossa fed by the middle meningeal artery. Venous drainage consisted of the superficial sylvian vein directed toward the superior sagittal sinus. The patient was in no good condition, so we only removed subdural hematoma, decompressed externally and ligated the external carotid artery. The postoperative course was uneventful, the anisocoria was diminished, and the consciousness improved up to confusion, but the right hemiparesis remained. Two months later a 2,760g baby girl was born by Caesarean section without accident. But two weeks later, suddenly she had generalized convulsions and became comatose. CT scan revealed an intracerebral hematoma in the middle fossa again. Second operation was performed, and the nidus was electrocoagulated and removed together with the hematoma. The postoperative course was also uneventful. At present, one and a half years after operation, no symptom of recurrence is observed. Intracerebral hemorrhage and dural AVM in pregnancy were discussed and the reports in the literature were reviewed.
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