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Yan S, Lu JJ, Chen L, Cai WH, Wu JZ. Hepatic perivascular epithelioid cell tumors: The importance of preoperative diagnosis. World J Gastroenterol 2024; 30:1926-1933. [PMID: 38659487 PMCID: PMC11036502 DOI: 10.3748/wjg.v30.i13.1926] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/22/2024] [Revised: 03/17/2024] [Accepted: 03/19/2024] [Indexed: 04/03/2024] Open
Abstract
Accurate preoperative diagnosis is highly important for the treatment of perivascular epithelioid cell tumors (PEComas) because PEComas are mainly benign tumors and may not require surgical intervention. By analyzing the causes, properties and clinical manifestations of PEComas, we summarize the challenges and solutions in the diagnosis of PEComas.
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Affiliation(s)
- Shuai Yan
- Department of Medical School, Nantong University, Nantong 226300, Jiangsu Province, China
- Department of Hepatobiliary Surgery, Affiliated Nantong Hospital 3 of Nantong University, Nantong 226006, Jiangsu Province, China
| | - Jia-Jie Lu
- Department of Medical School, Nantong University, Nantong 226300, Jiangsu Province, China
- Department of Hepatobiliary Surgery, Affiliated Nantong Hospital 3 of Nantong University, Nantong 226006, Jiangsu Province, China
| | - Lin Chen
- Nantong Institute of Liver Disease, Affiliated Nantong Hospital 3 of Nantong University, Nantong 226006, Jiangsu Province, China
| | - Wei-Hua Cai
- Department of Medical School, Nantong University, Nantong 226300, Jiangsu Province, China
- Department of Hepatobiliary Surgery, Affiliated Nantong Hospital 3 of Nantong University, Nantong 226006, Jiangsu Province, China
| | - Jin-Zhu Wu
- Department of Medical School, Nantong University, Nantong 226300, Jiangsu Province, China
- Department of Hepatobiliary Surgery, Affiliated Nantong Hospital 3 of Nantong University, Nantong 226006, Jiangsu Province, China
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Zhang P, Zhao JH, Yuan LX, Ju LL, Wang HX, Wang F, Chen L, Cai WH. DLAT is a promising prognostic marker and therapeutic target for hepatocellular carcinoma: a comprehensive study based on public databases. Sci Rep 2023; 13:17295. [PMID: 37828099 PMCID: PMC10570290 DOI: 10.1038/s41598-023-43835-y] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2023] [Accepted: 09/28/2023] [Indexed: 10/14/2023] Open
Abstract
Cuproptosis is a new mechanism of cell death that differs from previously identified regulatory cell death mechanisms. Cuproptosis induction holds promise as a new tumour treatment. Therefore, we investigated the value of cuproptosis-related genes in the management of hepatocellular carcinoma (HCC). The cuproptosis-related gene Dihydrolipoamide S-Acetyltransferase (DLAT) were significantly upregulated in liver cancer tissues. High levels of DLAT were an independent prognostic factor for shorter overallsurvival (OS) time. DLAT and its related genes were mainly involved in cell metabolism, tumor progression and immune regulation. DLAT was significantly associated with the level of immune cell infiltration and immune checkpoints in HCC. HCC with high DLAT expression was predicted to be more sensitive to sorafenib treatment. The risk prognostic signature established based on DLAT and its related genes had a good prognostic value. The cuproptosis-related gene DLAT is a promising independent prognostic marker and therapeutic target in HCC. The new prognostic signature can effectively predict the prognosis of HCC patients.
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Affiliation(s)
- Peng Zhang
- Nantong Institute of Liver Disease, Department of Hepatobiliary Surgery, Nantong Third People's Hospital, Affiliated Nantong Hospital 3 of Nantong University, Nantong, China
| | - Jiang-Hua Zhao
- Medical School of Nantong University, Nantong Third People's Hospital, Affiliated Nantong Hospital 3 of Nantong University, Nantong, China
| | - Liu-Xia Yuan
- Nantong Institute of Liver Disease, Nantong Third People's Hospital, Affiliated Nantong Hospital 3 of Nantong University, Nantong, China
| | - Lin-Ling Ju
- Nantong Institute of Liver Disease, Nantong Third People's Hospital, Affiliated Nantong Hospital 3 of Nantong University, Nantong, China
| | - Hui-Xuan Wang
- Nantong Institute of Liver Disease, Nantong Third People's Hospital, Affiliated Nantong Hospital 3 of Nantong University, Nantong, China
| | - Feng Wang
- Department of Laboratory Medicine, Affiliated Hospital of Nantong University, Medical School of Nantong University, Nantong, China
| | - Lin Chen
- Nantong Institute of Liver Disease, Nantong Third People's Hospital, Affiliated Nantong Hospital 3 of Nantong University, Nantong, China.
| | - Wei-Hua Cai
- Department of Hepatobiliary Surgery, Nantong Third People's Hospital, Affiliated Nantong Hospital 3 of Nantong University, Nantong, China.
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Wu YJ, Wang J, Zhang P, Yuan LX, Ju LL, Wang HX, Chen L, Cao YL, Cai WH, Ni Y, Li M. PIWIL1 interacting RNA piR-017724 inhibits proliferation, invasion, and migration, and inhibits the development of HCC by silencing PLIN3. Front Oncol 2023; 13:1203821. [PMID: 37503320 PMCID: PMC10369847 DOI: 10.3389/fonc.2023.1203821] [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] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2023] [Accepted: 06/26/2023] [Indexed: 07/29/2023] Open
Abstract
Background Hepatocellular carcinoma (HCC) accounts for the majority of primary liver cancers. Worldwide, liver cancer is the fourth most common cause of cancer-related death. Recent studies have found that PIWI-interacting RNAs (piRNAs) participate in the occurrence and development of various tumors and are closely related to the growth, invasion, metastasis and prognosis of malignant tumors. Studies on the role and functional mechanism of piRNAs in HCC development and progression are limited. Methods Quantitative reverse transcription-polymerase chain reaction (qRT-PCR) were used to detect the expression of piR-017724 in both HCC tissues and cells. Based on the clinical data of HCC patients, the clinical and prognostic value of piR-017724 was further analyzed. Then, targeted silencing and overexpressing of piR-017724 in HCC cells was further used to examine the biological functions of piR-017724. In addition, the downstream target protein of piR-017724 was predicted and validated through high-throughput sequencing and public databases. Results The piR-017724 was significantly downregulated in HCC tissues and cells, and the downregulation of piR-017724 was associated with tumor stage and poor prognosis in HCC. The piR-017724 inhibitor promoted the proliferation, migration and invasion of HCC cells, while the piR-017724 mimic had the opposite effect. However, the piR-017724 did not affect apoptosis of HCC cells. High-throughput sequencing and qRT-PCR confirmed a reciprocal relationship between piR-017724 and PLIN3. Therefore, we speculate that piR-017724 may inhibit the development and progression of HCC by affecting the downstream protein PLIN3. Conclusions Our study shows that piR-017724, which is lowly expressed in HCC, inhibits the proliferation, migration and invasion of HCC cells and may affect the development of hepatocellular liver cancer through PLIN3, which provides new insights into the clinical application of piR-017724 in the treatment of hepatocellular carcinoma.
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Affiliation(s)
- Yi-Jing Wu
- Medical School of Nantong University, Nantong Third People’s Hospital, Affiliated Nantong Hospital 3 of Nantong University, Nantong, China
| | - Jie Wang
- Medical School of Nantong University, Nantong Third People’s Hospital, Affiliated Nantong Hospital 3 of Nantong University, Nantong, China
| | - Peng Zhang
- Nantong Institute of Liver Disease, Department of Hepatobiliary Surgery, Nantong Third People’s Hospital, Affiliated Nantong Hospital 3 of Nantong University, Nantong, China
| | - Liu-Xia Yuan
- Nantong Institute of Liver Disease, Nantong Third People’s Hospital, Affiliated Nantong Hospital 3 of Nantong University, Nantong, China
| | - Lin-Ling Ju
- Nantong Institute of Liver Disease, Nantong Third People’s Hospital, Affiliated Nantong Hospital 3 of Nantong University, Nantong, China
| | - Hui-Xuan Wang
- Nantong Institute of Liver Disease, Nantong Third People’s Hospital, Affiliated Nantong Hospital 3 of Nantong University, Nantong, China
| | - Lin Chen
- Nantong Institute of Liver Disease, Nantong Third People’s Hospital, Affiliated Nantong Hospital 3 of Nantong University, Nantong, China
| | - Ya-Li Cao
- Preventive Health Department, Nantong Third People’s Hospital, Affiliated Nantong Hospital 3 of Nantong University, Nantong, China
| | - Wei-Hua Cai
- Department of Hepatobiliary Surgery, Nantong Third People’s Hospital, Affiliated Nantong Hospital 3 of Nantong University, Nantong, China
| | - Yi Ni
- Thyroid and Breast Surgery, Nantong Third People’s Hospital, Affiliated Nantong Hospital 3 of Nantong University, Nantong, China
| | - Min Li
- Integrating Traditional Chinese Medicine with Hepatology, Nantong Third People’s Hospital, Affiliated Nantong Hospital 3 of Nantong University, Nantong, China
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Zhang P, Zhao JH, Chen L, Bian ZL, Ju LL, Wang HX, Cai WH. Expression and function of myelin expression factor 2 in hepatocellular carcinoma. BMC Gastroenterol 2023; 23:20. [PMID: 36658471 PMCID: PMC9854206 DOI: 10.1186/s12876-023-02644-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/20/2022] [Accepted: 01/05/2023] [Indexed: 01/20/2023] Open
Abstract
INTRODUCTION Hepatocellular carcinoma (HCC) is one of the most common malignant tumours in the world and has a high mortality rate. However, the pathogenesis of HCC remains unclear. This study aimed to investigate the potential biomarkers of HCC. METHODS ONCOMINE, HCCDB and THE HUMAN PROTEIN ATLAS were used to identify myelin expression factor 2 (MYEF2) as a potential biomarker for HCC. The Cancer Genome Atlas database was used to further validate and analyse the value of MYEF2. Kaplan-Meier Plotter was used for the prognostic analysis. The COX regression model and Kaplan-Meier method were used to investigate the clinical value of MYEF2 in the prognosis of HCC by reviewing the survival status of patients. Fluorescent quantitative polymerase chain reaction (qPCR) and immunohistochemistry were used to detect the expressions of the MYEF2 mRNA and protein in HCC tissues and cell lines. qPCR and Western blotting were used to validate the efficiency of MYEF2 knockout and overexpression in HCC cells. The invasion and migration abilities regulated by MYEF2 were detected by performing transwell and wound healing assays. RESULTS MYEF2 is significantly upregulated in HCC and is mainly located in the nucleus of HCC cells. MYEF2 expression is significantly associated with the tumour stage, histological grade and TNM stage. High MYEF2 expression is an independent prognostic factor for patients with HCC. Functionally, elevated MYEF2 facilitated cell migration and invasion in vitro. In contrast, decreased MYEF2 inhibited cell migration and invasion. CONCLUSIONS MYEF2 may be a novel biomarker with potential diagnosis and prognosis values and as a potential therapeutic target for HCC.
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Affiliation(s)
- Peng Zhang
- grid.260483.b0000 0000 9530 8833Medical School of Nantong University, Nantong Third People’s Hospital, Nantong, 226000 Jiangsu People’s Republic of China
| | - Jiang-Hua Zhao
- grid.260483.b0000 0000 9530 8833Medical School of Nantong University, Nantong Third People’s Hospital, Nantong, 226000 Jiangsu People’s Republic of China
| | - Lin Chen
- grid.260483.b0000 0000 9530 8833Nantong Institute of Liver Diseases, Nantong Third People’s Hospital, Nantong University, Nantong, 226000 Jiangsu People’s Republic of China
| | - Zhao-Lian Bian
- grid.260483.b0000 0000 9530 8833Nantong Institute of Liver Diseases, Nantong Third People’s Hospital, Nantong University, Nantong, 226000 Jiangsu People’s Republic of China
| | - Lin-Ling Ju
- grid.260483.b0000 0000 9530 8833Nantong Institute of Liver Diseases, Nantong Third People’s Hospital, Nantong University, Nantong, 226000 Jiangsu People’s Republic of China
| | - Hui-Xuan Wang
- grid.260483.b0000 0000 9530 8833Nantong Institute of Liver Diseases, Nantong Third People’s Hospital, Nantong University, Nantong, 226000 Jiangsu People’s Republic of China
| | - Wei-Hua Cai
- grid.260483.b0000 0000 9530 8833Nantong Institute of Liver Disease, Department of Hepatobiliary Surgery, Nantong Third People’s Hospital, Nantong University, Nantong, 226000 Jiangsu People’s Republic of China
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Zheng M, Cai WH, Wang MF, Deng YJ, Huang LL, Cao YJ. Microarray Profile of Circular RNAs Identifies hsa_circ_0001583 as A New Circular RNA Biomarker for Breast Cancer: A Retrospective Study. Cell J 2022; 24:500-505. [PMID: 36274202 PMCID: PMC9588163 DOI: 10.22074/cellj.2022.8200] [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] [Received: 08/22/2021] [Indexed: 01/24/2023]
Abstract
OBJECTIVE Breast cancer (BC) is the most common cancer, which is currently the leading cause of cancer death. Circular RNAs (circRNAs) play important roles in cancer, however, circRNAs serving as vital index in BC for guiding treatment have not yet been identified. The aim of our study is to explore a novel kind of potential biomarker for BC. MATERIALS AND METHODS In this retrospective study, the samples used for assays were two groups of breast tumor tissue obtained from four BC patients, including four pairs of tumor tissues and adjacent nontumor samples. The circRNA expression profiles were detected via microarray and validated by real-time quantitative polymerase chain reaction (PCR). RESULTS The differentially expressed circRNAs in tested samples were screened and analyzed by using human circRNA microarray. After analysis, considering a fold gene expression change of ≥2.0 and P<0.05, results suggested that 256 circRNAs were significantly up-regulated and 277 circRNAs were significantly down-regulated. Besides, the results of the real-time quantitative PCR assay showed that the expression of hsa_circ_0001583 was significantly up-regulated in BC groups (P<0.05) by real-time quantitative PCR. Therefore, we thought hsa_circ_0001583 might serve as a novel kind of biomarker for BC. CONCLUSION Hsa_circ_0001583 showed significant up-regulation in BC patients with paired adjacent tissues. Many cancer immune pathways were related to has_circ_0001583, including autoimmune thyroid disease, chemokine and T-cell receptor signaling pathways.
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Affiliation(s)
- Min Zheng
- Department of Oncology, Fujian Key Laboratory of Precision Medicine for Cancer, The First Affiliated Hospital of Fujian Medical
University, Fujian, Fuzhou, P. R. China
| | - Wei-Hua Cai
- Department of Thyroid and Breast Surgery, The First Affiliated Hospital of Fujian Hospital of Fujian Medical University, Fujian,
Fuzhou, P. R. China
| | - Mou-Feng Wang
- Department of Oncology, Fujian Key Laboratory of Precision Medicine for Cancer, The First Affiliated Hospital of Fujian Medical
University, Fujian, Fuzhou, P. R. China
| | - Yu-Jie Deng
- Department of Oncology, Fujian Key Laboratory of Precision Medicine for Cancer, The First Affiliated Hospital of Fujian Medical
University, Fujian, Fuzhou, P. R. China
| | - Ling-Ling Huang
- Department of Oncology, Fujian Key Laboratory of Precision Medicine for Cancer, The First Affiliated Hospital of Fujian Medical
University, Fujian, Fuzhou, P. R. China
| | - Yong-Jin Cao
- Department of Thyroid and Breast Surgery, The First Affiliated Hospital of Fujian Hospital of Fujian Medical University, Fujian,
Fuzhou, P. R. China,Department of Thyroid and Breast SurgeryThe First Affiliated Hospital of Fujian Medical UniversityFujianFuzhouP. R. China
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Bai L, Yang HY, Cai WH, Bi J, Luo H, Yang MD. [Analysis of occupational health surveillance of workers exposed to benzenemethylbenzene and dimethylbenzene]. Zhonghua Lao Dong Wei Sheng Zhi Ye Bing Za Zhi 2019; 37:473-475. [PMID: 31256537 DOI: 10.3760/cma.j.issn.1001-9391.2019.06.019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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He MJ, Qi H, Wang YF, Ren YT, Cai WH, Ruan LM. Near-field radiative heat transfer in multilayered graphene system considering equilibrium temperature distribution. Opt Express 2019; 27:A953-A966. [PMID: 31510483 DOI: 10.1364/oe.27.00a953] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/07/2019] [Accepted: 05/28/2019] [Indexed: 06/10/2023]
Abstract
In the present work, the near-field radiative heat transfer of a multilayered graphene system is investigated within the framework of the many-body theory. For the first time, the temperature distribution corresponding to the steady state of the system is investigated. Unique temperature steps are observed near both boundaries of the system, especially in the strong near-field regime. By utilizing the effective radiative thermal conductance, the thermal freedom of heat flux in different regions of the system is analyzed quantitatively, and the cause of various temperature distributions is explained accordingly. To characterize the heat transfer ability of the whole system, we evaluate the system with two heat transfer coefficients (HTC), transient heat transfer coefficient (THTC), and steady heat transfer coefficient (SHTC). A unique many-body enhancement is observed, which causes a red-shift of resonance peak corresponding to graphene surface plasmon polaritons. Furthermore, a three-body enhancement of SHTC emerges thanks to the relay effect and the complexity of the system. The regime of heat transport can be tuned by changing the chemical potentials of graphene and undergoes a transition from diffusive to quasi-ballistic transport in the strong near-field regime.
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Gong NM, Yin HH, Cai WH, Li QW, Wang JX, Gu CY, Wang YF, Wu J, Zhang YF. IOUS and CE-IOUS during hepatic resection for patients with hepatocellular carcinoma in liver cirrhosis1. Clin Hemorheol Microcirc 2019; 71:483-498. [PMID: 30248049 DOI: 10.3233/ch-180431] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Nian-Mei Gong
- Department of Medical Ultrasound, Third People’s Hospital of Nantong University & Nantong Third People’s Hospital, Nantong, China
| | - Hao-Hao Yin
- Department of Medical Ultrasound, Shanghai Tenth People’s Hospital, Ultrasound Research and Education Institute, Tongji University School of Medicine, Shanghai, China
| | - Wei-Hua Cai
- Department of Hepatobiliary Surgery, Third People’s Hospital of Nantong University & Nantong Third People’s Hospital, Nantong, China
| | - Qiu-Wei Li
- Department of Medical Ultrasound, Third People’s Hospital of Nantong University & Nantong Third People’s Hospital, Nantong, China
| | - Jian-Xin Wang
- Department of Hepatobiliary Surgery, Third People’s Hospital of Nantong University & Nantong Third People’s Hospital, Nantong, China
| | - Chun-Yan Gu
- Department of Pathology, Third People’s Hospital of Nantong University & Nantong Third People’s Hospital, Nantong, China
| | - Yan-Fei Wang
- Department of Medical Ultrasound, Third People’s Hospital of Nantong University & Nantong Third People’s Hospital, Nantong, China
| | - Jing Wu
- Department of Medical Ultrasound, Third People’s Hospital of Nantong University & Nantong Third People’s Hospital, Nantong, China
| | - Yi-Feng Zhang
- Department of Medical Ultrasound, Shanghai Tenth People’s Hospital, Ultrasound Research and Education Institute, Tongji University School of Medicine, Shanghai, China
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Zheng M, Cao YJ, Cai WH, Shi X, Wang MF, Deng YJ. Phytic acid-based copper(ii) ion-selective electrode on graphene oxide for potentiometric immunoassay of breast cancer antigen 15-3. NEW J CHEM 2019. [DOI: 10.1039/c9nj01834d] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A potentiometric immunoassay based on a copper(ii) ion-selective electrode (Cu-ISE) was designed for the quantitative determination of carbohydrate antigen 15-3 (CA 15-3; a tumor marker associated with breast cancer).
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Affiliation(s)
- Min Zheng
- Department of Medical Oncology
- The First Affiliated Hospital of Fujian Medical University
- Fuzhou 350005
- P. R. China
| | - Yong-Jin Cao
- Department of Thyroid and Breast Surgery
- The First Affiliated Hospital of Fujian Medical University
- Fujian 350005
- P. R. China
| | - Wei-Hua Cai
- Department of Thyroid and Breast Surgery
- The First Affiliated Hospital of Fujian Medical University
- Fujian 350005
- P. R. China
| | - Xi Shi
- Department of Medical Oncology
- The First Affiliated Hospital of Fujian Medical University
- Fuzhou 350005
- P. R. China
| | - Mou-Feng Wang
- Department of Medical Oncology
- The First Affiliated Hospital of Fujian Medical University
- Fuzhou 350005
- P. R. China
| | - Yu-Jie Deng
- Department of Medical Oncology
- The First Affiliated Hospital of Fujian Medical University
- Fuzhou 350005
- P. R. China
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Su ZJ, Hu SG, Cai WH, Yang XF, Wang J, Fan JB, Huang HY, Huang WX. [Establishment of arsenic speciation analysis method and application in rice]. Zhonghua Yu Fang Yi Xue Za Zhi 2018; 52:994-1002. [PMID: 30392316 DOI: 10.3760/cma.j.issn.0253-9624.2018.10.006] [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: 06/08/2023]
Abstract
Objective: A new ion exchange column technology was used to establish an efficient and sensitive method for the detection of inorganic arsenic. Methods: Based on the new As Specia Fast Column, the pretreatment methods, liquid phase separation and mass spectrometry determination conditions of inorganic arsenic in rice were optimized. Finally, arsenic compounds were separated by As Specia Fast Column and detected by liquid chromatography inductively coupled plasma mass spectrometry. The external standard method was used for quantitative analysis. The detection limit, precision and accuracy of the method were determined by measuring the content of arsenic compounds in rice samples and rice standard samples. At the same time, three Guangdong rice samples were selected as the experimental samples of this study, and 1 g of each sample was weighed and measured in parallel three times. The method was compared with the method of liquid chromatography-atomic fluorescence spectrometry (LC-AFS) and liquid chromatography-inductively coupled plasma mass spectrometry (LC-ICP-MS) in the national standard. Results: The inorganic arsenic in rice was extracted with 0.5% nitric acid solution at 65 ℃ for 15 h, and the pH was adjusted to alkaline. The mobile phase A (8 mmol/L HNO(3), 50 mmol/L NH(3)·H(2)O) and mobile phase B (40 mmol/L HNO(3), 80 mmol/L NH(3)·H(2)O) were used as the mobile phase gradient elution (93%) . Five arsenic compounds can reach baseline separation under the conditions of RF power of 1 500 W and atomization gas flow of 0.97 L/min. The detection limits ranged from 0.114 to 0.331 μg/L, and the inorganic arsenic content in rice samples ranged from 0.063 to 0.232 mg/kg. The results of determination of arsenic compounds in rice flour reference materials were all within the uncertainty range indicated by the standard. The recoveries were 86.7%~106.7%, and the precision was 1.9%-12.5%. Compared with national standards, the results of determination of arsenate in rice were relatively close (using this method, LC-AFS, LC-ICP-MS to detect the content of arsenate in rice samples 1 was 0.231, 0.226, 0.236 mg/kg, respectively). However, due to insufficient sensitivity, the national standard method is difficult to detect low levels of arsenic compounds (Arsenobetaine was not detected in rice sample 1). The method can detect the content of arsenobetaine in rice sample 1 was 0.023 mg/kg. Conclusion: The established method can meet the requirements of inorganic arsenic determination in rice, and it is more rapid and accurate than the current national standard. It can better monitor and evaluate the content of i-As in rice, and provide accurate data for comprehensively grasping and evaluating the safety of rice consumption of residents.
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Affiliation(s)
- Z J Su
- Department of inspection, Centre for Disease Control and Prevention of Guangdong, Guangzhou 510300, China
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Tsai YF, Hsu LH, Wu CC, Cai WH, Yang KC, Fan FY. Correction to: Long-Term Oral Toxicity and Anti-osteoporotic Effect of Sintered Dicalcium Pyrophosphate in Rat Model of Postmenopausal Osteoporosis. J Med Biol Eng 2018. [DOI: 10.1007/s40846-018-0427-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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Zhou K, Yang HY, Tang PY, Liu W, Luo YJ, Lv B, Yin J, Jiang T, Chen J, Cai WH, Fan J. Mitochondrial division inhibitor 1 protects cortical neurons from excitotoxicity: a mechanistic pathway. Neural Regen Res 2018; 13:1552-1560. [PMID: 30127115 PMCID: PMC6126130 DOI: 10.4103/1673-5374.235299] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Mitochondrial division inhibitor 1 (Mdivi-1) is a selective cell-permeable inhibitor of dynamin-related protein-1 (Drp1) and mitochondrial division. To investigate the effect of Mdivi-1 on cells treated with glutamate, cerebral cortex neurons isolated from neonatal rats were treated with 10 mM glutamate for 24 hours. Normal cultured cells and dimethyl sulfoxide-cultured cells were considered as controls. Apoptotic cells were detected by flow cytometry. Changes in mitochondrial morphology were examined by electron microscopy. Drp1, Bax, and caspase-3 expression was evaluated by western blot assays and immunocytochemistry. Mitochondrial membrane potential was detected using the JC-1 probe. Twenty-four hours after 10 mM glutamate treatment, Drp1, Bax and caspase-3 expression was upregulated, Drp1 and Bax were translocated to mitochondria, mitochondrial membrane potential was decreased and the rate of apoptosis was increased. These effects were inhibited by treatment with 50 μM Mdivi-1 for 2 hours. This finding indicates that Mdivi-1 is a candidate neuroprotective drug that can potentially mitigate against neuronal injury caused by glutamate-induced excitotoxicity.
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Affiliation(s)
- Kuai Zhou
- Department of Orthopedics, First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu Province, China
| | - Hai-Yuan Yang
- Department of Orthopedics, BenQ Hospital Affiliated to Nanjing Medical University, Nanjing, Jiangsu Province, China
| | - Peng-Yu Tang
- Department of Orthopedics, First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu Province, China
| | - Wei Liu
- Department of Orthopedics, First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu Province, China
| | - Yong-Jun Luo
- Department of Orthopedics, First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu Province, China
| | - Bin Lv
- Department of Orthopedics, First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu Province, China
| | - Jian Yin
- Department of Orthopedics, Affiliated Jiangning Hospital of Nanjing Medical University, Nanjing, Jiangsu Province, China
| | - Tao Jiang
- Department of Orthopedics, First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu Province, China
| | - Jian Chen
- Department of Orthopedics, First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu Province, China
| | - Wei-Hua Cai
- Department of Orthopedics, First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu Province, China
| | - Jin Fan
- Department of Orthopedics, First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu Province, China
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Zhuang X, Cui AM, Wang Q, Cheng XY, Shen Y, Cai WH, Li HB, Zhang S, Qin G. Liver Dysfunction during Pregnancy and Its Association of With Preterm Birth in China: A Prospective Cohort Study. EBioMedicine 2017; 26:152-156. [PMID: 29174520 PMCID: PMC5832609 DOI: 10.1016/j.ebiom.2017.11.014] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2017] [Revised: 11/04/2017] [Accepted: 11/16/2017] [Indexed: 12/17/2022] Open
Abstract
BACKGROUND Liver dysfunction is common in pregnancy but its association with adverse pregnancy outcomes such as preterm birth (PTB) remains unclear. METHODS A prospective cohort of HBV-infected or uninfected pregnant women attending antenatal care was recruited at Nantong Maternal and Child Health Hospital between January 1, 2012, and June 30, 2016. Liver function tests (LFTs) were monitored through pregnancy. The primary outcomes were PTB and very PTB (delivery prior 37 and 32weeks' gestation respectively). Poisson regression was used to estimate adjusted risk ratios (RR) for women with HBV infection and LFT abnormalities. RESULTS Among 36,755 pregnant women (1,113 HBV carriers and 35,642 non-HBV subjects), 3,519 (9.57%) had abnormal LFTs. The commonest cause for liver dysfunction during pregnancy was non-alcoholic fatty liver diseases (NAFLD, 51.3%). Abnormal aspartate aminotransferase (AST), gamma-glutamyltransferase (GGT) and two folds upper limit of normal total bilirubin (RR and 95%CI: 2.73, 1.30-5.76; 2.24, 1.35-3.31; 2.01, 1.22-3.31 respectively), rather than HBsAg positivity, were identified as independent risk factors for preterm birth. Besides, GGT abnormality was associated with increased risk of very PTB. CONCLUSIONS We suggest that surveillance of LFTs among pregnant women should be warranted, given the increased risk of PTB.
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Affiliation(s)
- Xun Zhuang
- Department of Epidemiology and Biostatistics, School of Public Health, Nantong University, Nantong, China
| | - Ai-Min Cui
- Department of Obstetrics and Gynaecology, Nantong Maternal and Child Health Hospital Affiliated to Nantong University, Nantong, China
| | - Qin Wang
- Department of Nursing, Nantong Health College of Jiangsu Province, Nantong, China
| | - Xiao-Yan Cheng
- Department of Obstetrics and Gynaecology, Nantong Maternal and Child Health Hospital Affiliated to Nantong University, Nantong, China
| | - Yi Shen
- Department of Epidemiology and Biostatistics, School of Public Health, Nantong University, Nantong, China
| | - Wei-Hua Cai
- Department of Nursing, Nantong Health College of Jiangsu Province, Nantong, China
| | - Hai-Bo Li
- Department of Clinical Laboratory, Nantong Maternal and Child Health Hospital Affiliated to Nantong University, Nantong, China
| | - Sheng Zhang
- Department of Epidemiology and Biostatistics, School of Public Health, Nantong University, Nantong, China
| | - Gang Qin
- Center for Liver Diseases, Nantong Third People's Hospital Affiliated to Nantong University, Nantong, China..
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Chen ZX, Gu GF, Bian ZL, Cai WH, Shen Y, Hao YL, Zhang S, Shao JG, Qin G. Clinical course and perinatal transmission of chronic hepatitis B during pregnancy: A real-world prospective cohort study. J Infect 2017; 75:146-154. [DOI: 10.1016/j.jinf.2017.05.012] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2016] [Revised: 03/27/2017] [Accepted: 05/11/2017] [Indexed: 01/24/2023]
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15
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Cheng JP, Zhang HN, Cai WH, Li SN, Li FC. Effect of polymer additives on heat transport and large-scale circulation in turbulent Rayleigh-Bénard convection. Phys Rev E 2017; 96:013111. [PMID: 29347088 DOI: 10.1103/physreve.96.013111] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2017] [Indexed: 06/07/2023]
Abstract
The present paper presents direct numerical simulations of Rayleigh-Bénard convection (RBC) in an enclosed cell filled with the polymer solution in order to investigate the viscoelastic effect on the characteristics of heat transport and large-scale circulation (LSC) of RBC. To overcome the difficulties in numerically solving a high Weissenberg number (Wi) problem of viscoelastic fluid flow with strong elastic effect, the log-conformation reformulation method was implemented. Numerical results showed that the addition of polymers reduced the heat flux and the amount of heat transfer reduction (HTR) behaves nonmonotonically, which firstly increases but then decreases with Wi. The maximum HTR reaches around 8.7% at the critical Wi. The nonmonotonic behavior of HTR as a function of Wi was then corroborated with the modifications of the period of LSC and turbulent energy as well as viscous boundary layer thickness. Finally, a standard turbulent kinetic energy (TKE) budget analysis was done for the whole domain, the boundary layer region, and the bulk region. It showed that the role change of elastic stress contributions to TKE is mainly responsible for this nonmonotonic behavior of HTR.
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Affiliation(s)
- Jian-Ping Cheng
- School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
| | - Hong-Na Zhang
- School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
| | - Wei-Hua Cai
- School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
| | - Si-Ning Li
- School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
| | - Feng-Chen Li
- School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
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16
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Tsai YF, Hsu LH, Wu CC, Cai WH, Yang KC, Fan FY. Long-Term Oral Toxicity and Anti-osteoporotic Effect of Sintered Dicalcium Pyrophosphate in Rat Model of Postmenopausal Osteoporosis. J Med Biol Eng 2017; 37:181-190. [PMID: 29930493 PMCID: PMC5990578 DOI: 10.1007/s40846-016-0197-x] [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] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2015] [Accepted: 04/07/2016] [Indexed: 11/29/2022]
Abstract
Sintered dicalcium pyrophosphate (SDCP), a synthetic pyrophosphate analog, has shown potential for the management of osteoporosis. The long-term oral toxicity and anti-osteoporotic effect of SDCP in a postmenopausal osteoporosis rat model were evaluated in this study. SDCP was orally administered to bilateral ovariectomized (OVX) Wistar rats at a dose of 0.75 mg/kg daily for 24 weeks following by 2 weeks of observation. There were no abnormal findings in clinical signs of toxicity, food consumption, body weight, blood examination, necropsy, and histological inspection attributable to the ingestion of SDCP. The serum level of type I collagen fragments, a bone resorption marker, decreased in SDCP-treated rats, and the bone formation markers alkaline phosphatase, osteocalcin, and osteopontin significantly decreased. These findings indicate that the bone turnover rate decreased in SDCP-treated animals. Relative to OVX rats, the increase in serum tartrate-resistant acid phosphatase 5b level represents an increase in bony tissues in the SDCP-treated rats. Histological examinations of distal femoral metaphyses further revealed that the ingestion of SDCP improved the trabecular bone architecture and decreased bone porosity. Analysis of limb bone ashes showed a significant increase in bone mineral content. Our results show that SDCP inhibits bone resorption to restore bone mass in OVX rats without deleterious effects, and therefore that SDCP has potential in the management of osteoporosis.
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Affiliation(s)
- Yuh-Feng Tsai
- 1Department of Diagnostic Radiology, Shin-Kong Wu Ho-Su Memorial Hospital, Taipei City, 111 Taiwan.,2School of Medicine, Fu-Jen Catholic University, New Taipei City, 24205 Taiwan
| | - Li-Ho Hsu
- 3Department of Orthopedics, En Chu Kong Hospital, New Taipei City, 23702 Taiwan.,4Department of Orthopedics, College of Medicine, National Taiwan University Hospital, National Taiwan University, Taipei City, 10002 Taiwan
| | - Chang-Chin Wu
- 3Department of Orthopedics, En Chu Kong Hospital, New Taipei City, 23702 Taiwan.,4Department of Orthopedics, College of Medicine, National Taiwan University Hospital, National Taiwan University, Taipei City, 10002 Taiwan.,5Department of Biomedical Engineering, Yuanpei University of Medical Technology, Hsinchu, 30015 Taiwan
| | - Wei-Hua Cai
- 6School of Dental Technology, College of Oral Medicine, Taipei Medical University, 250 Wu-Hsing Street, Taipei City, 11031 Taiwan
| | - Kai-Chiang Yang
- 6School of Dental Technology, College of Oral Medicine, Taipei Medical University, 250 Wu-Hsing Street, Taipei City, 11031 Taiwan
| | - Fang-Yu Fan
- 6School of Dental Technology, College of Oral Medicine, Taipei Medical University, 250 Wu-Hsing Street, Taipei City, 11031 Taiwan
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17
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Zhang L, Cai WH, Huang B, Chen LW, Zhang N, Ni B. Single-stage posterior debridement and single-level instrumented fusion for spontaneous infectious spondylodiscitis of the lumbar spine. Acta Orthop Belg 2011; 77:816-822. [PMID: 22308629] [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: 05/31/2023]
Abstract
Spontaneous infectious spondylodiscitis (SIS) is an uncommon condition. The purpose of this retrospective study of 10 adult patients (6 males and 4 females, average age 52 years), all with lumbar SIS and epidural abscess, was to analyze the efficacy of single-stage posterior debridement plus single-level interbody grafting with autologous bone, and transpedicular screw-rod instrumentation. The mean follow-up period was 43 months, with a minimum of 30 months. The back pain was relieved within 3 to 8 days after surgery. Neurologic deficits, present in 5 cases, all improved. Solid fusion was achieved at 6 months in all 10 cases. The mean VAS for pain improved from 7.5 to 1.6, the mean Oswestry Disability Index from 57.8% to 8.1%. The mean physical component of SF-36 (PCS) improved from 32.4% to 54.7%, the mean mental component of SF-36 (MCS) improved from 33.8% to 57.2%. All these changes were significant (p < 0.001). No recurrence of infection was noted. The outcome was quite satisfactory in terms of fusion rate and quality of life.
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Affiliation(s)
- Liang Zhang
- Dept of Orthopaedics, Changzheng Hospital, Second Military Medical University, Shanghai, China
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18
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Cai WH, Tian Y, Sun JY, Zhang JG. [A new method to optimize the performance of JPEG2000-based PACS images' storage, transmission and display]. Zhongguo Yi Liao Qi Xie Za Zhi 2008; 32:242-256. [PMID: 18973030] [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: 05/27/2023]
Abstract
In connection with the efficiency problem of narrow-band PACS medical images transmission and display and following the DICOM 3.0 standard and JPEG2000 code stream properties of progressing transmission and free access, this paper presents a new parallel processing method of the images transmission and display. This method raises the performance of images' transmission, storage and display, and has been evaluated in the clinical medical diagnosis information system.
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Affiliation(s)
- Wei-Hua Cai
- Laboratory for Medical Imaging Informatics, Shanghai Institute of Technical Physics, China Academy of Sciences, 200083, Shanghai.
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Saheki Y, Li ST, Matsushita M, Wu YM, Cai WH, Wei FY, Lu YF, Moriwaki A, Tomizawa K, Matsui H. A new approach to inhibiting astrocytic IP3-induced intracellular calcium increase in an astrocyte-neuron co-culture system. Brain Res 2006; 1055:196-201. [PMID: 16099437 DOI: 10.1016/j.brainres.2005.06.056] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2005] [Revised: 06/15/2005] [Accepted: 06/16/2005] [Indexed: 11/24/2022]
Abstract
Astrocytes exhibit dynamic Ca2+ mobilization, such as Ca2+ wave and Ca2+ oscillation, via an inositol 1,4,5-triphosphate-induced Ca2+ release (IICR)-dependent mechanism. The physiological functions of astrocytic Ca2+ mobilization, however, are poorly understood. To investigate this issue, we created a plasmid encoding an enhanced green fluorescent protein-tagged inositol 1,4,5-triphosphate absorbent protein and expressed it in cultured astrocytes. Expression of this protein inhibited both IICR and the Ca2+ wave in cultured astrocytes. By combining this method to the single cell electroporation technique, we were able to inhibit IICR specifically in astrocytes in an astrocyte-neuron co-culture system. Our approach provides a useful tool for direct examination of the physiological role of astrocytic Ca2+ signaling on neuronal function.
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Affiliation(s)
- Yasunori Saheki
- Department of Physiology, Graduate School of Medicine and Dentistry, Okayama University, 2-5-1 Shikata, Okayama 700-8558, Japan
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Abstract
Glycoprotein B (gB) of herpes simplex virus type 1 is an envelope protein that is essential for viral growth. We previously reported the isolation of two gB-null viruses, which form gB-free virions in nonpermissive cells. In the present study, these gB-free virions were shown to bind to the cell surface at the same rate as the wild-type virus. They failed, however, to form plaques and to synthesize virus-specific proteins upon infection. Their plating efficiency was significantly enhanced by treatment with polyethylene glycol, a membrane fusion agent. Therefore, gB is required in a stage after viral attachment but before the expression of the virus-specific proteins. A gB-null syncytial virus was isolated, which contained a gB defect and a syncytial mutation in another genetic locus. It caused complete fusion of gB-transformed cells but no fusion on untransformed cells, indicating the essential role of gB in virus-induced cell fusion. Mutations located at two independent sites in the cytoplasmic domain of gB were transferred to viral DNA and shown to confer a syncytial phenotype to the virus. A transient-expression assay was developed to determine the ability of a set of plasmids containing addition and nonsense mutations in the gB gene to complement the cell-fusion defect in the gB-null syncytial virus. Mutations in plasmids, including those located in the extracytoplasmic domain of gB, were identified that reduced the fusion activity of gB. Therefore, gB contains different functional regions responsible for fusion induction and its inhibition.
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Affiliation(s)
- W H Cai
- Department of Molecular and Cell Biology, Pennsylvania State University, University Park 16802
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21
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Highlander SL, Cai WH, Person S, Levine M, Glorioso JC. Monoclonal antibodies define a domain on herpes simplex virus glycoprotein B involved in virus penetration. J Virol 1988; 62:1881-8. [PMID: 2452895 PMCID: PMC253270 DOI: 10.1128/jvi.62.6.1881-1888.1988] [Citation(s) in RCA: 90] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
In an earlier report (S.D. Marlin, S.L. Highlander, T.C. Holland, M. Levine, and J.C. Glorioso, J. Virol. 59: 142-153), we described the production and use of complement-dependent virus-neutralizing monoclonal antibodies (MAbs) and MAb-resistant (mar) mutants to identify five antigenic sites (I to V) on herpes simplex virus type 1 glycoprotein B (gB). In the present study, the mechanism of virus neutralization was determined for a MAb specific for site III (B4), the only site recognized by MAbs which exhibited complement-independent virus-neutralizing ability. This antibody had no detectable effect on virus attachment but neutralized viruses after adsorption to cell monolayers. These findings implied that the mechanism of B4 neutralization involved blocking of virus penetration. The remaining antibodies, which recognized sites I, II, and IV, required active complement for effective neutralization. These were further studied for their ability to impede virus infectivity in the absence of complement. Antibodies to sites I (B1 and B3) and IV (B6) slowed the rate at which viruses penetrated cell surfaces, supporting the conclusion that antibody binding to gB can inhibit penetration by a virus. The data suggest that MAbs can interfere with penetration by a virus by binding to a domain within gB which is involved in this process. In another assay of virus infection, MAb B6 significantly reduced plaque development, indicating that antibody binding to gB expressed on infected-cell surfaces can also interfere with the ability of a virus to spread from cell to cell. In contrast to these results, antibodies to site II (B2 and B5) had no effect on virus infectivity; this suggests that they recognized structures which do not play a direct role in the infectious process. To localize regions of gB involved in these phenomena, antibody-binding sites were operationally mapped by radioimmunoprecipitation of a panel of truncated gB molecules produced in transient-expression assays. Residues critical to recognition by antibodies which affect penetration by a virus (sites I, III, and IV) mapped to a region of the molecule (amino acid residues 241 to 441) which is centrally located within the external domain. Antibodies which had no effect on penetration (site II) recognized sequences distal to this region (residues 596 to 737) near the transmembrane domain. The data suggest that these gB-specific MAbs recognize two major antigenic sites which reside in physically distinct components of the external domain of gB.(ABSTRACT TRUNCATED AT 400 WORDS)
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Affiliation(s)
- S L Highlander
- Graduate Program in Cellular and Molecular Biology, University of Michigan Medical School, Ann Arbor 48109
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Stillman MJ, Law AY, Cai WH, Zelazowski AJ. Information on metal binding properties of metallothioneins from optical spectroscopy. Experientia Suppl 1987; 52:203-11. [PMID: 2959506 DOI: 10.1007/978-3-0348-6784-9_13] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Absorption, circular dichroism and emission measurements made during titrations of rabbit liver Zn-MT and calf liver Cu, Zn-MT with Cd2+ and Cu+ are reported. There are systematic changes in the CD and emission spectra that can be associated with the formation of several species during these titrations. Addition of Cu+ to Zn-MT results in the formation of distinct species that form at specific stoichiometries, these are: Cu6-MT, Cu12-MT and Cu20-MT. The emission intensity due to Cu+ provides a sensitive indication of the presence of Cu-S clusters for the Cu6-MT and Cu12-MT species, suggesting that Cu6-Sx clusters form in both the alpha and beta domains of the protein. The data also demonstrate that Cd7-MT will bind 12 Cu+ to form a species with the stoichiometry of 12 Cu: 4 Cd, and that, surprisingly, Cu12-MT will also bind Cd2+ to form this same new species. It is suggested that the new species incorporates a Cu6 cluster in the beta domain and a mixed-metal Cu6, Cd4 cluster in the alpha domain.
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Affiliation(s)
- M J Stillman
- Department of Chemistry, University of Western Ontario, London, Canada
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