1
|
Wu Y, Zhou Z, Ai Z, Wang T, Cui L. Abnormal blood concentration changes in a 71-year-old female who survived a 10,000mg overdose of clozapine: a case report. BMC Psychiatry 2024; 24:123. [PMID: 38355481 PMCID: PMC10865518 DOI: 10.1186/s12888-024-05582-w] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/05/2023] [Accepted: 02/03/2024] [Indexed: 02/16/2024] Open
Abstract
BACKGROUND Clozapine is a highly effective second-generation antipsychotic with few extrapyramidal reactions, making it a preferred choice among clinicians. However, instances of acute clozapine poisoning resulting from suicide attempts and misuse have been reported. Through our review of existing literature, we identified that we believe to be the highest recorded overdose of clozapine in elderly patients, resulting in a nonfatal outcome. CASE PRESENTATION The case report involves a 71-year-old female with a history of depression who ingested a dose of 10,000 mg of clozapine. Approximately 6 h after the overdose, the clozapine level was 5,200 μg/L, significantly surpassing the recommended therapeutic concentration range of 350-600 μg/L. After gastric lavage and hemoperfusion, the blood level dropped to 1847.11 μg/L. Notably, during therapeutic drugs monitoring (TDM), we found a perplexing spike in the patient's blood level to 5554.15 μg/L after the second hemoperfusion. CONCLUSION In this case we mainly focused on the abnormal fluctuations in the concentration of clozapine. We conducted a comprehensive analysis of potential factors contributing to this abnormal phenomenon in terms of the patient's age, clinical symptoms, various laboratory test indexes, and the pharmacokinetics of clozapine. Our findings underscore the importance of timely TDM and the precision of results in managing elderly patients experiencing high-dose clozapine poisoning.
Collapse
Affiliation(s)
- Yonghua Wu
- Department of Laboratory Medicine, Peking University Third Hospital, No.49, North Garden Rd, Haidian District, Beijing, 100191, China.
| | - Ziyan Zhou
- Department of Laboratory Medicine, Peking University Third Hospital, No.49, North Garden Rd, Haidian District, Beijing, 100191, China
| | - Ziyi Ai
- Department of Laboratory Medicine, Peking University Third Hospital, No.49, North Garden Rd, Haidian District, Beijing, 100191, China
| | - Tiancheng Wang
- Department of Laboratory Medicine, Peking University Third Hospital, No.49, North Garden Rd, Haidian District, Beijing, 100191, China
| | - Liyan Cui
- Department of Laboratory Medicine, Peking University Third Hospital, No.49, North Garden Rd, Haidian District, Beijing, 100191, China
| |
Collapse
|
2
|
Wu Z, Jiao Y, Liu F, Ai Z, Zhang Q. Reducing temperature sensitivity of gas measurement using chirped-modulated photoacoustic spectroscopy. Rev Sci Instrum 2022; 93:094902. [PMID: 36182511 DOI: 10.1063/5.0106669] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/29/2022] [Accepted: 08/17/2022] [Indexed: 06/16/2023]
Abstract
Resonance frequency drift caused by a change in temperature greatly limits the application of high-Q resonators with high temperature sensitivity in photoacoustic (PA) gas detection systems. In this work, a chirp-wavelength combined modulation method was designed by incorporating a real-time frequency scanning in wavelength-modulated PA spectroscopy to reduce the influence of temperature changes on measurement. Theoretical analysis shows that the chirp rate depends on the precision requirements and the cutoff frequency of the cascaded low-pass filter. Trace acetylene measurement experiment at varying temperature verified that the proposed method can significantly reduce the temperature sensitivity within a preset temperature range. Thus, this method can effectively reduce the temperature sensitivity of a high-Q resonator for improving the measurement accuracy and detection limit in trace gas detection.
Collapse
Affiliation(s)
- Z Wu
- State Key Laboratory of Electric Insulation and Power Equipment, Xi'an Jiaotong University, Xi'an 710049, People's Republic of China
| | - Y Jiao
- State Key Laboratory of Electric Insulation and Power Equipment, Xi'an Jiaotong University, Xi'an 710049, People's Republic of China
| | - F Liu
- State Key Laboratory of Electric Insulation and Power Equipment, Xi'an Jiaotong University, Xi'an 710049, People's Republic of China
| | - Z Ai
- State Key Laboratory of Electric Insulation and Power Equipment, Xi'an Jiaotong University, Xi'an 710049, People's Republic of China
| | - Q Zhang
- State Key Laboratory of Electric Insulation and Power Equipment, Xi'an Jiaotong University, Xi'an 710049, People's Republic of China
| |
Collapse
|
3
|
Huang NY, Liu YY, Yu JW, Xu YW, Zheng XH, Zhang DH, Ai Z, Wu HS, Diao XW, Ye XQ, Yi CY, Mao HP, Yang X, Yu XQ, Chen W. [Current status of hyperkalemia in dialysis patients in China]. Zhonghua Yi Xue Za Zhi 2021; 101:3466-3471. [PMID: 34775703 DOI: 10.3760/cma.j.cn112137-20210802-01710] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Objective: To investigate the prevalence and associated factors of hyperkalemia in dialysis patients. Methods: Patients underwent hemodialysis (HD) and peritoneal dialysis (PD) from multi-center databases were recruited from January 2017 to December 2019, and those aged ≥18 years and with dialysis duration ≥3 months were included to analyze the prevalence and related factors of hyperkalemia. Results: A total of 12 364 patients were enrolled in the study, and 6 836 cases were men. The average age of the patients was (51±15) years. Among these patients, 4 230 cases underwent HD while 8 134 received PD. Hyperkalemia was detected in 20.7% (2 554/12 364) of the patients while hypokalemia was found in 17.0%(2 102/12 364) of the patients. Multivariate logistic regression showed that HD (OR=2.25, 95%CI: 1.54-3.30), diabetes mellitus (DM) (OR=1.65, 95%CI: 1.17-2.32), high body mass index (BMI) (OR=1.06, 95%CI: 1.03-1.09), high levels of serum albumin (OR=1.04, 95%CI: 1.01-1.07) and phosphorus (OR=3.12, 95%CI: 2.44-4.00), low levels of serum bicarbonate (OR=0.89, 95%CI: 0.87-0.92), triglycerides (OR=0.76, 95%CI: 0.68-0.85) and creatinine (OR=0.95, 95%CI: 0.90-0.99), usage of angiotensin converting enzyme inhibitor/Angiotensin Ⅱ receptor antagonist (ACEI/ARB, OR=1.38, 95%CI: 1.11-1.72) and beta-blocker (OR=1.32, 95%CI: 1.07-1.64) were associated with hyperkalemia. Conclusions: Hyperkalemia occurred in 20.7% of the dialysis patients. HD, DM, high BMI, high levels of serum albumin and phosphorus, low levels of serum bicarbonate, triglycerides and creatinine, use of ACEI/ARB were associated with hyperkalemia.
Collapse
Affiliation(s)
- N Y Huang
- Department of Nephrology, the First Affiliated Hospital of Sun Yat-sen University/Key Laboratory of Nephrology, National Health Commission/Guangdong Provincial Key Laboratory of Nephrology, Guangzhou 510080, China
| | - Y Y Liu
- Department of Nephrology, the First Affiliated Hospital of Sun Yat-sen University/Key Laboratory of Nephrology, National Health Commission/Guangdong Provincial Key Laboratory of Nephrology, Guangzhou 510080, China
| | - J W Yu
- Department of Nephrology, the First Affiliated Hospital of Sun Yat-sen University/Key Laboratory of Nephrology, National Health Commission/Guangdong Provincial Key Laboratory of Nephrology, Guangzhou 510080, China
| | - Y W Xu
- Department of Nephrology, the First Affiliated Hospital of Sun Yat-sen University/Key Laboratory of Nephrology, National Health Commission/Guangdong Provincial Key Laboratory of Nephrology, Guangzhou 510080, China
| | - X H Zheng
- Department of Nephrology, the First Affiliated Hospital of Sun Yat-sen University/Key Laboratory of Nephrology, National Health Commission/Guangdong Provincial Key Laboratory of Nephrology, Guangzhou 510080, China
| | - D H Zhang
- Department of Nephrology, the First Affiliated Hospital of Sun Yat-sen University/Key Laboratory of Nephrology, National Health Commission/Guangdong Provincial Key Laboratory of Nephrology, Guangzhou 510080, China
| | - Z Ai
- Department of Nephrology, the First Affiliated Hospital of Sun Yat-sen University/Key Laboratory of Nephrology, National Health Commission/Guangdong Provincial Key Laboratory of Nephrology, Guangzhou 510080, China
| | - H S Wu
- Department of Nephrology, the First Affiliated Hospital of Sun Yat-sen University/Key Laboratory of Nephrology, National Health Commission/Guangdong Provincial Key Laboratory of Nephrology, Guangzhou 510080, China
| | - X W Diao
- Department of Nephrology, the First Affiliated Hospital of Sun Yat-sen University/Key Laboratory of Nephrology, National Health Commission/Guangdong Provincial Key Laboratory of Nephrology, Guangzhou 510080, China
| | - X Q Ye
- Department of Nephrology, the First Affiliated Hospital of Sun Yat-sen University/Key Laboratory of Nephrology, National Health Commission/Guangdong Provincial Key Laboratory of Nephrology, Guangzhou 510080, China
| | - C Y Yi
- Department of Nephrology, the First Affiliated Hospital of Sun Yat-sen University/Key Laboratory of Nephrology, National Health Commission/Guangdong Provincial Key Laboratory of Nephrology, Guangzhou 510080, China
| | - H P Mao
- Department of Nephrology, the First Affiliated Hospital of Sun Yat-sen University/Key Laboratory of Nephrology, National Health Commission/Guangdong Provincial Key Laboratory of Nephrology, Guangzhou 510080, China
| | - X Yang
- Department of Nephrology, the First Affiliated Hospital of Sun Yat-sen University/Key Laboratory of Nephrology, National Health Commission/Guangdong Provincial Key Laboratory of Nephrology, Guangzhou 510080, China
| | - X Q Yu
- Department of Nephrology, the First Affiliated Hospital of Sun Yat-sen University/Key Laboratory of Nephrology, National Health Commission/Guangdong Provincial Key Laboratory of Nephrology, Guangzhou 510080, China
| | - W Chen
- Department of Nephrology, the First Affiliated Hospital of Sun Yat-sen University/Key Laboratory of Nephrology, National Health Commission/Guangdong Provincial Key Laboratory of Nephrology, Guangzhou 510080, China
| |
Collapse
|
4
|
Wang S, Ai Z, Song M, Yan P, Li J, Wang S. The association between vitamin D receptor FokI gene polymorphism and osteoporosis in postmenopausal women: a meta-analysis. Climacteric 2020; 24:74-79. [PMID: 32551997 DOI: 10.1080/13697137.2020.1775806] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
OBJECTIVE This study aimed to quantitatively summarize the evidence for vitamin D receptor (VDR) FokI gene polymorphism and osteoporosis risk in Caucasian and Asian postmenopausal women. MATERIALS AND METHODS The PubMed, EMBASE, Weipu, CNKI, and Wanfang databases were searched for eligible studies. Case-control studies containing available genotype frequencies for F/f were chosen, and the odds ratio (OR) with 95% confidence interval (CI) was used to assess the strength of this association. RESULTS In total, 3349 osteoporosis cases and 3202 controls were identified in our meta-analysis. In the stratified analysis, a significant association was observed between VDR FokI gene polymorphism and postmenopausal osteoporosis susceptibility in Asian subjects (additive model: OR = 1.529, 95% CI 1.053-2.219, p = 0.026; dominant model: OR 2.711, 95% CI 1.693-4.342 p < 0.001; co-dominant model: ff vs. FF, OR 2.796, 95% CI 1.439-5.433 p = 0.002), and we failed to find any significant relationship in Caucasian populations. CONCLUSION The present meta-analysis suggests that the VDR FokI genotype is associated with increased risk of osteoporosis in Asian women but not in Caucasian women. To draw comprehensive and true conclusions, further prospective studies with larger numbers of participants worldwide are needed to examine associations between VDR FokI polymorphism and osteoporosis.
Collapse
Affiliation(s)
- S Wang
- Laboratory of Molecular Biology, Hangzhou Seventh People's Hospital, Hangzhou, China
| | - Z Ai
- Institute of Genetics, Zhejiang University School of Medicine, Hangzhou, China
| | - M Song
- Laboratory of Molecular Biology, Hangzhou Seventh People's Hospital, Hangzhou, China
| | - P Yan
- Laboratory of Molecular Biology, Hangzhou Seventh People's Hospital, Hangzhou, China
| | - J Li
- Laboratory of Molecular Biology, Hangzhou Seventh People's Hospital, Hangzhou, China
| | - S Wang
- Laboratory of Molecular Biology, Hangzhou Seventh People's Hospital, Hangzhou, China
| |
Collapse
|
5
|
Chen X, Liu Z, Ai Z. Antineoplastic mechanism of Octreotide action in human hepatoma. Chin Med J (Engl) 2001; 114:1167-70. [PMID: 11729512] [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: 02/22/2023] Open
Abstract
OBJECTIVES To investigate whether apoptosis can be induced by Octreotide in human hepatoma cells in vitro and elucidate the antineoplastic mechanism of Octreotide in hepatoma. METHODS A cultured human hepatoma cell line, BEL-7402, was exposed to Octreotide and apoptosis was evaluated by cytochemical staining (Hochesst 33,258), transmission electron microscopy, agarose gel electrophoresis and flow cytometry (FCM). RESULTS After exposure to 0.2 microgram/ml Octreotide, apoptosis with nuclear chromatin condensation as well as fragmentation, cell shrinkage and the formation of apoptotic bodies was observed using cytochemical staining and transmission electron microscopy. A DNA ladder in agarose gel electrophoresis was also displayed. FCM showed that the apoptotic cell number rose with an increase in the concentration of Octreotide (0-2 micrograms/ml). There was a positive correlation between Octreotide concentration and apoptotic rate in BEL-7402 cells (r = 0.809, P < 0.05). CONCLUSION Apoptosis in human hepatoma cells can be induced by Octreotide, which may be related to the mechanism of antineoplastic action of Octreotide in hepatoma.
Collapse
Affiliation(s)
- X Chen
- Department of General Surgery, Zhongnan Hospital, Wuhan University, Wuhan 430071, China.
| | | | | |
Collapse
|
6
|
Chhadia A, Dech F, Ai Z, Silverstein JC. Autocolorization of three-dimensional radiological data. Stud Health Technol Inform 2001; 81:90-6. [PMID: 11317826] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/19/2023]
Abstract
It requires skill, effort, and time to visualize desired anatomic structures from radiological data in three-dimensions. There have been many attempts at automating this process and making it less labor intensive. The technique we have developed is based on mutual information for automatic multi-modality image fusion (MIAMI Fuse, University of Michigan). The initial development of our technique has focused on the autocolorization of the liver, portal vein, and hepatic vein. A standard dataset in which these structures had been segmented and assigned colors was created from the full color Visible Human Female (VHF) and then optimally fused to the fresh CT Visible Human Female. This semi-automatic segmentation and coloring of the CT dataset was subjectively evaluated to be reasonably accurate. The transformation could be viewed interactively on the ImmersaDesk, in an immersive Virtual Reality (VR) environment. This 3D segmentation and visualization method marks the first step to a broader, standardized automatic structure visualization method for radiological data. Such a method, would permit segmentation of radiological data by canonical structure information and not just from the data's intrinsic dynamic range.
Collapse
Affiliation(s)
- A Chhadia
- University of Illinois at Chicago, VRMedLab, HHSB M/C 530, Chicago, IL 60612-7249, USA.
| | | | | | | |
Collapse
|
7
|
Dech F, Ai Z, Silverstein JC. Manipulation of volumetric patient data in a distributed virtual reality environment. Stud Health Technol Inform 2001; 81:119-25. [PMID: 11317724] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/19/2023]
Abstract
Due to increases in network speed and bandwidth, distributed exploration of medical data in immersive Virtual Reality (VR) environments is becoming increasingly feasible. The volumetric display of radiological data in such environments presents a unique set of challenges. The shear size and complexity of the datasets involved not only make them difficult to transmit to remote sites, but these datasets also require extensive user interaction in order to make them understandable to the investigator and manageable to the rendering hardware. A sophisticated VR user interface is required in order for the clinician to focus on the aspects of the data that will provide educational and/or diagnostic insight. We will describe a software system of data acquisition, data display, Tele-Immersion, and data manipulation that supports interactive, collaborative investigation of large radiological datasets. The hardware required in this strategy is still at the high-end of the graphics workstation market. Future software ports to Linux and NT, along with the rapid development of PC graphics cards, open the possibility for later work with Linux or NT PCs and PC clusters.
Collapse
Affiliation(s)
- F Dech
- University of Illinois at Chicago, VRMedLab, HHSB M/C 530, Chicago, IL 60612-7249, USA.
| | | | | |
Collapse
|
8
|
Ai Z, Dech F, Rasmussen M, Silverstein JC. Radiological tele-immersion for next generation networks. Stud Health Technol Inform 2000; 70:4-9. [PMID: 10977581] [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: 02/17/2023]
Abstract
Since the acquisition of high-resolution three-dimensional patient images has become widespread, medical volumetric datasets (CT or MR) larger than 100 MB and encompassing more than 250 slices are common. It is important to make this patient-specific data quickly available and usable to many specialists at different geographical sites. Web-based systems have been developed to provide volume or surface rendering of medical data over networks with low fidelity, but these cannot adequately handle stereoscopic visualization or huge datasets. State-of-the-art virtual reality techniques and high speed networks have made it possible to create an environment for clinicians geographically distributed to immersively share these massive datasets in real-time. An object-oriented method for instantaneously importing medical volumetric data into Tele-Immersive environments has been developed at the Virtual Reality in Medicine Laboratory (VRMedLab) at the University of Illinois at Chicago (UIC). This networked-VR setup is based on LIMBO, an application framework or template that provides the basic capabilities of Tele-Immersion. We have developed a modular general purpose Tele-Immersion program that automatically combines 3D medical data with the methods for handling the data. For this purpose a DICOM loader for IRIS Performer has been developed. The loader was designed for SGI machines as a shared object, which is executed at LIMBO's runtime. The loader loads not only the selected DICOM dataset, but also methods for rendering, handling, and interacting with the data, bringing networked, real-time, stereoscopic interaction with radiological data to reality. Collaborative, interactive methods currently implemented in the loader include cutting planes and windowing. The Tele-Immersive environment has been tested on the UIC campus over an ATM network. We tested the environment with 3 nodes; one ImmersaDesk at the VRMedLab, one CAVE at the Electronic Visualization Laboratory (EVL) on east campus, and a CT scan machine in UIC Hospital. CT data was pulled directly from the scan machine to the Tele-Immersion server in our Laboratory, and then the data was synchronously distributed by our Onyx2 Rack server to all the VR setups. Instead of permitting medical volume visualization at one VR device, by combining teleconferencing, tele-presence, and virtual reality, the Tele-Immersive environment will enable geographically distributed clinicians to intuitively interact with the same medical volumetric models, point, gesture, converse, and see each other. This environment will bring together clinicians at different geographic locations to participate in Tele-Immersive consultation and collaboration.
Collapse
Affiliation(s)
- Z Ai
- University of Illinois at Chicago, VRMedLab 60612, USA. ,
| | | | | | | |
Collapse
|
9
|
Abstract
Gap junction channels composed of connexin43 (Cx43) are essential for normal heart formation and function. We studied the potential role of the Wnt family of secreted polypeptides as regulators of Cx43 expression and gap junction channel function in dissociated myocytes and intact hearts. Neonatal rat cardiomyocytes responded to Li(+), which mimics Wnt signaling, by accumulating the effector protein beta-catenin and by inducing Cx43 mRNA and protein markedly. Induction of Cx43 expression was also observed in cardiomyocytes cocultured with Rat-2 fibroblasts or N2A neuroblastoma cells programmed to secrete bioactive Wnt-1. By transfecting a Cx43 promoter-reporter gene construct into cardiomyocytes, we demonstrated that the inductive effect of Wnt signaling was transcriptionally mediated. Enhanced expression of Cx43 increased cardiomyocyte cell coupling, as determined by Lucifer Yellow dye transfer and by calcium wave propagation. Conversely, in a transgenic cardiomyopathic mouse model that exhibits ventricular arrhythmias and gap junctional remodeling, beta-catenin and Cx43 expression were downregulated concordantly. In response to Wnt signaling, the accumulating Cx43 colocalized with beta-catenin in the junctional membrane; moreover, forced expression of Cx43 in cardiomyocytes reduced the transactivation potential of beta-catenin. These findings demonstrate that Wnt signaling is an important modulator of Cx43-dependent intercellular coupling in the heart, and they support the hypothesis that dysregulated signaling contributes to altered impulse propagation and arrhythmia in the myopathic heart.
Collapse
Affiliation(s)
- Z Ai
- Section of Myocardial Biology, Zena and Michael A. Wiener Cardiovascular Institute, Department of Medicine, Mount Sinai School of Medicine, New York, New York 10029, USA
| | | | | | | | | |
Collapse
|
10
|
Jindal HK, Ai Z, Gascard P, Horton C, Cohen CM. Specific loss of protein kinase activities in senescent erythrocytes. Blood 1996; 88:1479-87. [PMID: 8695869] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023] Open
Abstract
Rabbit erythrocytes of progressively increasing age were isolated using an avidin-biotin affinity technique and the activity of protein kinases and other enzymes was analyzed in cytosols and membranes from the isolated cells. The activities of cytosolic protein kinase C (PKC), cAMP-dependent kinase (PKA), and casein kinase type I and II (CKI and II) were all found to undergo an age-dependent decrease of twofold to fourfold over the 8-week lifespan of the cells. Membrane-associated tyrosine kinase showed little or no decrease, but membrane-associated CKI showed a dramatic eightfold decrease over the 8-week period. By contrast, various cytosolic enzymes, including lactate dehydrogenase, phosphoglycerate kinase, pyruvate kinase, and acid phosphatase, showed no change in activity over the same time period. Density-separated human erythrocytes showed qualitatively similar decreases in cytosolic protein kinase activities in the densest fractions, which contain the oldest cells. Our results show that aging erythrocytes undergo progressive loss of protein kinases that may adversely affect various cellular processes. The age-dependent loss of kinase activity reported here is one of the most striking manifestations of erythrocyte senescence yet to be reported.
Collapse
Affiliation(s)
- H K Jindal
- Department of Biomedical Research, St Elizabeth's Medical Center, Tufts University, School of Medicine, Boston, MA 02135, USA
| | | | | | | | | |
Collapse
|
11
|
Ai Z, Misra S, Susa M, Varticovski L, Cohen CM. Phosphatidylinositol 3-kinase activity in murine erythroleukemia cells during DMSO-induced differentiation. Exp Cell Res 1995; 219:454-60. [PMID: 7641797 DOI: 10.1006/excr.1995.1252] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [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: 01/26/2023]
Abstract
We have used murine erythroleukemia cells (MEL cells) to investigate the role of phosphatidylinositol 3-kinase (PI 3-kinase) in erythroid differentiation. When treated with dimethyl sulfoxide (DMSO), MEL cells grown on a fibronectin matrix become committed to erythroid differentiation asynchronously, with 90% of cells becoming committed by Day 3 of treatment. We found that during the first 3 days of DMSO treatment MEL cells showed a twofold increase in total PI 3-kinase activity and a fourfold increase in the highly phosphorylated PI 3-kinase product, PIP3. At the same time there was no change in the content of p85, the PI 3-kinase regulatory subunit. After Day 3, PI 3-kinase activity declined, in parallel with a disappearance of p85 antigen from the cells. Inclusion of the PI 3-kinase inhibitor Wortmannin in the culture medium resulted in an inhibition of cellular PI 3-kinase activity and a delay in DMSO-induced erythroid differentiation. These data suggest that PI 3-kinase may play a critical role during commitment of MEL cells to erythroid differentiation.
Collapse
Affiliation(s)
- Z Ai
- Department of Biomedical Research, St. Elizabeth's Medical Center, Boston, Massachusetts 02135, USA
| | | | | | | | | |
Collapse
|
12
|
Gong S, Ai Z, Zhou Y. [Protective effects of prostacyclin on acute necrotizing pancreatitis and its renal damage in rats]. Zhonghua Wai Ke Za Zhi 1995; 33:197-200. [PMID: 7587668] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
In a rat model with acute necrotizing pancreatitis (ANP), the administration of exogenous prostacyclin (PGI2) significantly increased the pancreatic and renal blood flow, brought the level of 6-keto-PGF1 alpha to TXB2 in renal vein blood back to normal, reduced the severity of pancreatic and renal histolcagic damage, decreased the mortality, and prolonged survival time. The study showed that exogenous PGI2 can increase pancreatic blood flow in rats with ANP, help to prevent ANP, and protect from renal damage following ANP.
Collapse
Affiliation(s)
- S Gong
- Zhaoquing First People's Hospital
| | | | | |
Collapse
|
13
|
Abstract
An algorithm for accurate rendering of space-filling molecular models with shadows is presented. The intensity of light and cast shadows are computed to generate realistic pictures. Arbitrary numbers of light sources, which may be at infinite or finite distances can be applied. Hidden-surface removal, lighting, and shadowing are presented in detail.
Collapse
Affiliation(s)
- Z Ai
- Lab of Molecular and Biomolecular Electronics, Southeast University, Nanjing, P. R. China
| | | |
Collapse
|