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Fosque LJ, Alipour A, Zare M, Williams-García RV, Beggs JM, Ortiz G. Quasicriticality explains variability of human neural dynamics across life span. Front Comput Neurosci 2022; 16:1037550. [PMID: 36532868 PMCID: PMC9747757 DOI: 10.3389/fncom.2022.1037550] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2022] [Accepted: 10/27/2022] [Indexed: 08/26/2023] Open
Abstract
Aging impacts the brain's structural and functional organization and over time leads to various disorders, such as Alzheimer's disease and cognitive impairment. The process also impacts sensory function, bringing about a general slowing in various perceptual and cognitive functions. Here, we analyze the Cambridge Centre for Ageing and Neuroscience (Cam-CAN) resting-state magnetoencephalography (MEG) dataset-the largest aging cohort available-in light of the quasicriticality framework, a novel organizing principle for brain functionality which relates information processing and scaling properties of brain activity to brain connectivity and stimulus. Examination of the data using this framework reveals interesting correlations with age and gender of test subjects. Using simulated data as verification, our results suggest a link between changes to brain connectivity due to aging and increased dynamical fluctuations of neuronal firing rates. Our findings suggest a platform to develop biomarkers of neurological health.
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Affiliation(s)
- Leandro J. Fosque
- Department of Physics, Indiana University, Bloomington, IN, United States
| | - Abolfazl Alipour
- Department of Psychological and Brain Sciences, Indiana University, Bloomington, IN, United States
| | | | | | - John M. Beggs
- Department of Physics, Indiana University, Bloomington, IN, United States
| | - Gerardo Ortiz
- Department of Physics, Indiana University, Bloomington, IN, United States
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Triolo E, Khegai O, Ozkaya E, Rossi N, Alipour A, Fleysher L, Balchandani P, Kurt M. Design, Construction, and Implementation of a Magnetic Resonance Elastography Actuator for Research Purposes. Curr Protoc 2022; 2:e379. [PMID: 35286023 PMCID: PMC9517172 DOI: 10.1002/cpz1.379] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Magnetic resonance elastography (MRE) is a technique for determining the mechanical response of soft materials using applied harmonic deformation of the material and a motion-sensitive magnetic resonance imaging sequence. This technique can elucidate significant information about the health and development of human tissue such as liver and brain, and has been used on phantom models (e.g., agar, silicone) to determine their suitability for use as a mechanical surrogate for human tissues in experimental models. The applied harmonic deformation used in MRE is generated by an actuator, transmitted in bursts of a specified duration, and synchronized with the magnetic resonance signal excitation. These actuators are most often a pneumatic design (common for human tissues or phantoms) or a piezoelectric design (common for small animal tissues or phantoms). Here, we describe how to design and assemble both a pneumatic and a piezoelectric MRE actuator for research purposes. For each of these actuator types, we discuss displacement requirements, end-effector options and challenges, electronics and electronic-driving requirements and considerations, and full MRE implementation. We also discuss how to choose the actuator type, size, and power based on the intended material and use. © 2022 Wiley Periodicals LLC. Basic Protocol 1: Design, construction, and implementation of a convertible pneumatic MRE actuator for use with tissues and phantom models Basic Protocol 2: Design, construction, and implementation of a piezoelectric MRE actuator for localized excitation in phantom models.
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Affiliation(s)
- E.R. Triolo
- University of Washington, Dept. of Mechanical Engineering (3900 E Stevens Way NE Seattle, WA 98195)
| | - O. Khegai
- Icahn School of Medicine at Mount Sinai, BioMedical Engineering and Imaging Institute (1470 Madison Ave, New York City, NY 10029)
| | - E. Ozkaya
- Icahn School of Medicine at Mount Sinai, BioMedical Engineering and Imaging Institute (1470 Madison Ave, New York City, NY 10029)
| | - N. Rossi
- Stevens Institute of Technology, Dept. of Mechanical Engineering (1 Castle Point Terrace, Hoboken, NJ 07030)
| | - A. Alipour
- Icahn School of Medicine at Mount Sinai, BioMedical Engineering and Imaging Institute (1470 Madison Ave, New York City, NY 10029)
| | - L. Fleysher
- Icahn School of Medicine at Mount Sinai, BioMedical Engineering and Imaging Institute (1470 Madison Ave, New York City, NY 10029)
| | - P. Balchandani
- Icahn School of Medicine at Mount Sinai, BioMedical Engineering and Imaging Institute (1470 Madison Ave, New York City, NY 10029)
| | - M. Kurt
- University of Washington, Dept. of Mechanical Engineering (3900 E Stevens Way NE Seattle, WA 98195)
- Icahn School of Medicine at Mount Sinai, BioMedical Engineering and Imaging Institute (1470 Madison Ave, New York City, NY 10029)
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Alipour A, Beggs JM, Brown JW, James TW. A computational examination of the two-streams hypothesis: which pathway needs a longer memory? Cogn Neurodyn 2022; 16:149-165. [PMID: 35126775 PMCID: PMC8807798 DOI: 10.1007/s11571-021-09703-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2020] [Revised: 06/26/2021] [Accepted: 07/14/2021] [Indexed: 02/03/2023] Open
Abstract
The two visual streams hypothesis is a robust example of neural functional specialization that has inspired countless studies over the past four decades. According to one prominent version of the theory, the fundamental goal of the dorsal visual pathway is the transformation of retinal information for visually-guided motor behavior. To that end, the dorsal stream processes input using absolute (or veridical) metrics only when the movement is initiated, necessitating very little, or no, memory. Conversely, because the ventral visual pathway does not involve motor behavior (its output does not influence the real world), the ventral stream processes input using relative (or illusory) metrics and can accumulate or integrate sensory evidence over long time constants, which provides a substantial capacity for memory. In this study, we tested these relations between functional specialization, processing metrics, and memory by training identical recurrent neural networks to perform either a viewpoint-invariant object classification task or an orientation/size determination task. The former task relies on relative metrics, benefits from accumulating sensory evidence, and is usually attributed to the ventral stream. The latter task relies on absolute metrics, can be computed accurately in the moment, and is usually attributed to the dorsal stream. To quantify the amount of memory required for each task, we chose two types of neural network models. Using a long-short-term memory (LSTM) recurrent network, we found that viewpoint-invariant object categorization (object task) required a longer memory than orientation/size determination (orientation task). Additionally, to dissect this memory effect, we considered factors that contributed to longer memory in object tasks. First, we used two different sets of objects, one with self-occlusion of features and one without. Second, we defined object classes either strictly by visual feature similarity or (more liberally) by semantic label. The models required greater memory when features were self-occluded and when object classes were defined by visual feature similarity, showing that self-occlusion and visual similarity among object task samples are contributing to having a long memory. The same set of tasks modeled using modified leaky-integrator echo state recurrent networks (LiESN), however, did not replicate the results, except under some conditions. This may be because LiESNs cannot perform fine-grained memory adjustments due to their network-wide memory coefficient and fixed recurrent weights. In sum, the LSTM simulations suggest that longer memory is advantageous for performing viewpoint-invariant object classification (a putative ventral stream function) because it allows for interpolation of features across viewpoints. The results further suggest that orientation/size determination (a putative dorsal stream function) does not benefit from longer memory. These findings are consistent with the two visual streams theory of functional specialization. SUPPLEMENTARY INFORMATION The online version contains supplementary material available at 10.1007/s11571-021-09703-z.
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Affiliation(s)
- Abolfazl Alipour
- Department of Psychological and Brain Sciences, Indiana University, Bloomington, IN USA
- Program in Neuroscience, Indiana University, Bloomington, IN USA
| | - John M Beggs
- Program in Neuroscience, Indiana University, Bloomington, IN USA
- Department of Physics, Indiana University, Bloomington, IN USA
| | - Joshua W Brown
- Department of Psychological and Brain Sciences, Indiana University, Bloomington, IN USA
- Program in Neuroscience, Indiana University, Bloomington, IN USA
| | - Thomas W James
- Department of Psychological and Brain Sciences, Indiana University, Bloomington, IN USA
- Program in Neuroscience, Indiana University, Bloomington, IN USA
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Alipour A, Hatam G, Seradj H. Microtubule Disruption Without Learning Impairment in the Unicellular Organism, Paramecium: Implications for Information Processing in Microtubules. Basic Clin Neurosci 2022; 13:139-152. [PMID: 36589025 PMCID: PMC9790103 DOI: 10.32598/bcn.2021.2462.1] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2020] [Revised: 04/05/2020] [Accepted: 07/25/2020] [Indexed: 01/04/2023] Open
Abstract
Introduction Information processing in microtubules is an open question that has not been adequately addressed. It was suggested that microtubules could store and process information in the nervous system or even support consciousness. The unicellular organism, Paramecium caudatum, has a microtubular structure but lacks a neuron or neural network. However, it shows intelligent behaviors such as associative learning. This property may suggest that the microtubules are involved in intelligent behavior, information storage, or information processing in this organism. Methods To test this hypothesis and study the role of microtubules in P. caudatum learning, we utilized a learning task in which the organism associates brightness in its swimming medium with attractive cathodal shocks. To see if microtubules are an integral part of information storage and processing in P. caudatum, we disrupted the microtubular dynamics in the organism using an antimicrotubular agent (parbendazole). Results We observed that while a partial allosteric modulator of GABA (midazolam) could disrupt the learning process in P. caudatum, the antimicrotubular agent could not interfere with the learning. Conclusion Microtubules are probably not vital for the learning behavior in P. caudatum. Consequently, our results call for further investigation of the microtubular information processing hypothesis. Highlights Importance of Information processing in microtubules;Microtubules could store and process information in the nervous system;Unicellular organism, Paramecium caudatum, has a microtubular structure but lacks a neuron or neural network. Plain Language Summary Information processing in microtubules is an open question that has not been adequately addressed. It was suggested that microtubules could store and process information in the nervous system or even support consciousness. The unicellular organism, Paramecium caudatum, has a microtubular structure but lacks a neuron or neural network. However, it shows intelligent behaviors such as associative learning. This property may suggest that the microtubules are involved in intelligent behavior, information storage, or information processing in this organism. To test this hypothesis and study the role of microtubules in P. caudatum learning, we utilized a learning task in which the organism associates brightness in its swimming medium with attractive cathodal shocks. To see if microtubules are an integral part of information storage and processing in P. caudatum, we disrupted the microtubular dynamics in the organism using an antimicrotubular agent (parbendazole). We observed that while a partial allosteric modulator of GABA (midazolam) could disrupt the learning process in P. caudatum, the antimicrotubular agent could not interfere with the learning. Microtubules are probably not vital for the learning behavior in P. caudatum. Consequently, our results call for further investigation of the microtubular information processing hypothesis.
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Affiliation(s)
- Abolfazl Alipour
- Department of Pharmacognosy, School of Pharmacy, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Gholamreza Hatam
- Department of Parasitology and Mycology, School of Medicine, Shiraz University of Medical Sciences, Shiraz, Iran
- Basic Sciences in Infectious Diseases Research Center, School of Medicine, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Hassan Seradj
- Department of Pharmacognosy, School of Pharmacy, Shiraz University of Medical Sciences, Shiraz, Iran
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Ozkaya E, Triolo ER, Rezayaraghi F, Abderezaei J, Meinhold W, Hong K, Alipour A, Kennedy P, Fleysher L, Ueda J, Balchandani P, Eriten M, Johnson CL, Yang Y, Kurt M. Brain-mimicking phantom for biomechanical validation of motion sensitive MR imaging techniques. J Mech Behav Biomed Mater 2021; 122:104680. [PMID: 34271404 DOI: 10.1016/j.jmbbm.2021.104680] [Citation(s) in RCA: 3] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2021] [Revised: 05/07/2021] [Accepted: 06/30/2021] [Indexed: 10/20/2022]
Abstract
Motion sensitive MR imaging techniques allow for the non-invasive evaluation of biological tissues by using different excitation schemes, including physiological/intrinsic motions caused by cardiac pulsation or respiration, and vibrations caused by an external actuator. The mechanical biomarkers extracted through these imaging techniques have been shown to hold diagnostic value for various neurological disorders and conditions. Amplified MRI (aMRI), a cardiac gated imaging technique, can help track and quantify low frequency intrinsic motion of the brain. As for high frequency actuation, the mechanical response of brain tissue can be measured by applying external high frequency actuation in combination with a motion sensitive MR imaging sequence called Magnetic Resonance Elastography (MRE). Due to the frequency-dependent behavior of brain mechanics, there is a need to develop brain phantom models that can mimic the broadband mechanical response of the brain in order to validate motion-sensitive MR imaging techniques. Here, we have designed a novel phantom test setup that enables both the low and high frequency responses of a brain-mimicking phantom to be captured, allowing for both aMRI and MRE imaging techniques to be applied on the same phantom model. This setup combines two different vibration sources: a pneumatic actuator, for low frequency/intrinsic motion (1 Hz) for use in aMRI, and a piezoelectric actuator for high frequency actuation (30-60 Hz) for use in MRE. Our results show that in MRE experiments performed from 30 Hz through 60 Hz, propagating shear waves attenuate faster at higher driving frequencies, consistent with results in the literature. Furthermore, actuator coupling has a substantial effect on wave amplitude, with weaker coupling causing lower amplitude wave field images, specifically shown in the top-surface shear loading configuration. For intrinsic actuation, our results indicate that aMRI linearly amplifies motion up to at least an amplification factor of 9 for instances of both visible and sub-voxel motion, validated by varying power levels of pneumatic actuation (40%-80% power) under MR, and through video analysis outside the MRI scanner room. While this investigation used a homogeneous brain-mimicking phantom, our setup can be used to study the mechanics of non-homogeneous phantom configurations with bio-interfaces in the future.
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Affiliation(s)
- E Ozkaya
- Department of Mechanical Engineering, Stevens Institute of Technology, Hoboken, NJ, 07030, USA.
| | - E R Triolo
- Department of Mechanical Engineering, Stevens Institute of Technology, Hoboken, NJ, 07030, USA
| | - F Rezayaraghi
- Department of Mechanical Engineering, Stevens Institute of Technology, Hoboken, NJ, 07030, USA
| | - J Abderezaei
- Department of Mechanical Engineering, Stevens Institute of Technology, Hoboken, NJ, 07030, USA
| | - W Meinhold
- The George W. Woodruff of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA, 30332, USA
| | - K Hong
- BioMedical Engineering and Imaging Institute, Icahn School of Medicine at Mount Sinai, New York, NY, 10029, USA
| | - A Alipour
- BioMedical Engineering and Imaging Institute, Icahn School of Medicine at Mount Sinai, New York, NY, 10029, USA
| | - P Kennedy
- BioMedical Engineering and Imaging Institute, Icahn School of Medicine at Mount Sinai, New York, NY, 10029, USA
| | - L Fleysher
- BioMedical Engineering and Imaging Institute, Icahn School of Medicine at Mount Sinai, New York, NY, 10029, USA
| | - J Ueda
- The George W. Woodruff of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA, 30332, USA
| | - P Balchandani
- BioMedical Engineering and Imaging Institute, Icahn School of Medicine at Mount Sinai, New York, NY, 10029, USA
| | - M Eriten
- Department of Mechanical Engineering, University of Wisconsin-Madison, Madison, WI, 53706, USA
| | - C L Johnson
- Department of Biomedical Engineering, University of Deleware, Newark, DE, 19716, USA
| | - Y Yang
- BioMedical Engineering and Imaging Institute, Icahn School of Medicine at Mount Sinai, New York, NY, 10029, USA
| | - M Kurt
- Department of Mechanical Engineering, Stevens Institute of Technology, Hoboken, NJ, 07030, USA; BioMedical Engineering and Imaging Institute, Icahn School of Medicine at Mount Sinai, New York, NY, 10029, USA
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Alipour A, Giffney T, Lin R, Jayaraman K. Effects of matrix viscosity on morphological and rheological properties and the electrical percolation threshold in graphene/epoxy nanocomposites. EXPRESS POLYM LETT 2021. [DOI: 10.3144/expresspolymlett.2021.46] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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Alipour A, Mozhdehfarahbakhsh A, Nouri S, Petramfar P, Tahamtan M, Kamali AM, Rao KS, Nami M. Studies on the Bottom-Up and Top-Down Neural Information Flow Alterations in Neurodegeneration. J Alzheimers Dis 2020; 78:169-183. [PMID: 32955463 DOI: 10.3233/jad-200590] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [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: 01/08/2023]
Abstract
BACKGROUND A proper explanation for perceptual symptoms in neurodegenerative disorders including Alzheimer's disease and Parkinson's disease (PD) is still lacking. OBJECTIVE This study aimed at investigating the imbalance between 'bottom-up' and 'top-down' information flow (IF) and processing in PD in relation with visual hallucination symptoms. METHODS Here, we looked at bottom-up and top-down IF markers using resting state electroencephalographic (EEG) data from PD patients analyzed through three different IF measures (direct Directed Transfer Function (dDTF), full frequency Directed Transfer Function (ff-DTF), and renormalized Partial Directed Coherence (rPDC). RESULTS We observed an increased gamma band IF and a reduced beta band IF in PD patients compared to healthy controls. Additionally, we noticed a reduced theta band IF in PD patients using dDTF as a measure of IF. By source localizing the EEG activity of the PD patients and healthy controls, we looked at the alterations of IF in the prefrontal cortex of PD patients as well. CONCLUSION In line with previous studies, our results suggest that the delicate balance between bottom-up and top-down IF is disrupted in Parkinson's disease potentially contributing to the cognitive symptoms of PD patients.
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Affiliation(s)
- Abolfazl Alipour
- Neuroscience Laboratory, NSL (Brain, Cognition and Behavior), Department of Neuroscience, School of Advanced Medical Sciences and Technologies, Shiraz University of Medical Sciences, Shiraz, Iran.,Department of Psychological and Brain Sciences, Indiana University, Bloomington, IN, USA.,Program in Neuroscience, Indiana University, Bloomington, IN, USA
| | - Azadeh Mozhdehfarahbakhsh
- Neuroscience Laboratory, NSL (Brain, Cognition and Behavior), Department of Neuroscience, School of Advanced Medical Sciences and Technologies, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Saba Nouri
- Neuroscience Laboratory, NSL (Brain, Cognition and Behavior), Department of Neuroscience, School of Advanced Medical Sciences and Technologies, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Peyman Petramfar
- Clinical Neurology Research Center, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Mahshid Tahamtan
- DANA Brain Health Institute, Iranian Neuroscience Society-Fars Chapter, Shiraz, Iran
| | - Ali-Mohammad Kamali
- DANA Brain Health Institute, Iranian Neuroscience Society-Fars Chapter, Shiraz, Iran
| | - K S Rao
- Centre for Neuroscience, Instituto de Investigaciones Científicas y Servicios de Alta Tecnología (INDICASAT AIP), Panama City, Panama
| | - Mohammad Nami
- Neuroscience Laboratory, NSL (Brain, Cognition and Behavior), Department of Neuroscience, School of Advanced Medical Sciences and Technologies, Shiraz University of Medical Sciences, Shiraz, Iran.,DANA Brain Health Institute, Iranian Neuroscience Society-Fars Chapter, Shiraz, Iran.,Centre for Neuroscience, Instituto de Investigaciones Científicas y Servicios de Alta Tecnología (INDICASAT AIP), Panama City, Panama.,Institute for Cognitive Science Studies-ICSS, Brain and Cognition Clinic, Tehran, Iran
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Alipour A, Zarinabadi S, Azimi A, Mirzaei M. Adsorptive removal of Pb(II) ions from aqueous solutions by thiourea-functionalized magnetic ZnO/nanocellulose composite: Optimization by response surface methodology (RSM). Int J Biol Macromol 2020; 151:124-135. [DOI: 10.1016/j.ijbiomac.2020.02.109] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2019] [Revised: 01/30/2020] [Accepted: 02/11/2020] [Indexed: 01/18/2023]
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Klaver MN, Wintgens LIS, Wijffels MCEF, Balt JC, van Dijk VF, Alipour A, Chaldoupi SM, Derksen R, Boersma LVA. Acute success and safety of the second-generation PVAC GOLD phased RF ablation catheter for atrial fibrillation. J Interv Card Electrophysiol 2020; 60:261-270. [PMID: 32253598 PMCID: PMC7925470 DOI: 10.1007/s10840-020-00728-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/14/2019] [Accepted: 03/10/2020] [Indexed: 11/24/2022]
Abstract
PURPOSE The second-generation multi-electrode catheter, pulmonary vein ablation catheter (PVAC) GOLD, was designed to improve the delivery of phased radiofrequency energy and reduce procedure times using a 'single-shot' approach for pulmonary vein isolation (PVI), while retaining efficacy and safety. This large registry presents acute success rates and safety outcomes in a daily practice setting. METHODS A total of 1017 patients undergoing first-time ablation for atrial fibrillation (AF) using PVAC GOLD were included, 644 patients with paroxysmal AF and 373 patients with non-paroxysmal AF, divided into 175 patients receiving PVI only and 198 patients receiving PVI with additional substrate modification. RESULTS High and comparable percentages of successful PVI could be achieved in all groups (98%, 95% and 99%; p = 0.108). The median total procedure time for all groups was 90 min [70-100]. As expected, the total procedure, ablation and fluoroscopy time were significantly longer in the PVI + substrate modification group compared with the PVI-only cases (all p < 0.001), but not between the PVI-only groups (p = 0.306, p = 0.088, p = 0.233, respectively). A total of 44 complications were observed in 43 patients (4.2%). Major complications were seen in 19 patients (1.87%) and non-major procedure-related complications were seen in 25 patients (2.46%). Complications leaving permanent sequelae were rare and occurred in only four patients (0.39%). Complications did not differ between groups (p = 0.199, p = 0.438, p = 0.240 and p = 0.465 respectively). CONCLUSION PVAC GOLD performs successful PVI, while reducing procedure times and retaining safety for paroxysmal, persistent and long-standing persistent AF. Safety was unaffected by additional substrate modification.
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Affiliation(s)
- M N Klaver
- Department of Cardiology, St. Antonius Hospital, Koekoekslaan 1, 3435CM, Nieuwegein, The Netherlands. .,Department of Cardiology, Amsterdam University Medical Centres, location Academic Medical Centre, Amsterdam, The Netherlands.
| | - L I S Wintgens
- Department of Cardiology, St. Antonius Hospital, Koekoekslaan 1, 3435CM, Nieuwegein, The Netherlands
| | - M C E F Wijffels
- Department of Cardiology, St. Antonius Hospital, Koekoekslaan 1, 3435CM, Nieuwegein, The Netherlands
| | - J C Balt
- Department of Cardiology, St. Antonius Hospital, Koekoekslaan 1, 3435CM, Nieuwegein, The Netherlands
| | - V F van Dijk
- Department of Cardiology, St. Antonius Hospital, Koekoekslaan 1, 3435CM, Nieuwegein, The Netherlands
| | - A Alipour
- Department of Cardiology, Rivierenland Hospital, Tiel, The Netherlands
| | - S M Chaldoupi
- Department of Cardiology, Maastricht University Medical Centre, Maastricht, The Netherlands
| | - R Derksen
- Department of Cardiology, Rijnstate Hospital, Arnhem, The Netherlands
| | - L V A Boersma
- Department of Cardiology, St. Antonius Hospital, Koekoekslaan 1, 3435CM, Nieuwegein, The Netherlands.,Department of Cardiology, Amsterdam University Medical Centres, location Academic Medical Centre, Amsterdam, The Netherlands
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Vakili F, Alipour A, Merghati Khoei E, Rasoolinejad M. Vulnérabilité des femmes infectées par le VIH à un dysfonctionnement sexuel : rôle des croyances sexuelles dysfonctionnelles. Sexologies 2019. [DOI: 10.1016/j.sexol.2019.05.004] [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: 12/01/2022]
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Vakili F, Alipour A, Merghati Khoei E, Rasoolinejad M. HIV infected women vulnerability for presenting sexual dysfunction: The role of sexual dysfunctional beliefs. Sexologies 2019. [DOI: 10.1016/j.sexol.2019.05.003] [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: 10/26/2022]
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Wintgens L, Klaver M, Chaldoupi S, Van Dijk V, Alipour A, Wijffels M, Balt J, Boersma L. P344Anatomy of the pulmonary veins and clinical outcome after pulmonary vein isolation in paroxysmal atrial fibrillation: a large-scaled single-centre experience. Europace 2018. [DOI: 10.1093/europace/euy015.155] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- L Wintgens
- St Antonius Hospital, Cardiology, Nieuwegein, Netherlands
| | - M Klaver
- St Antonius Hospital, Cardiology, Nieuwegein, Netherlands
| | - S Chaldoupi
- Haga University Hospital, The Hague, Netherlands
| | - V Van Dijk
- St Antonius Hospital, Cardiology, Nieuwegein, Netherlands
| | - A Alipour
- St Antonius Hospital, Cardiology, Nieuwegein, Netherlands
| | - M Wijffels
- St Antonius Hospital, Cardiology, Nieuwegein, Netherlands
| | - J Balt
- St Antonius Hospital, Cardiology, Nieuwegein, Netherlands
| | - L Boersma
- St Antonius Hospital, Cardiology, Nieuwegein, Netherlands
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Wintgens L, Klaver M, Swaans M, Alipour A, Balt J, Van Dijk V, Rensing B, Wijffels M, Boersma L. P394Left atrial catheter ablation in patients with previously implanted left atrial appendage closure devices. Europace 2018. [DOI: 10.1093/europace/euy015.205] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- L Wintgens
- St Antonius Hospital, Cardiology, Nieuwegein, Netherlands
| | - M Klaver
- St Antonius Hospital, Cardiology, Nieuwegein, Netherlands
| | - M Swaans
- St Antonius Hospital, Cardiology, Nieuwegein, Netherlands
| | - A Alipour
- St Antonius Hospital, Cardiology, Nieuwegein, Netherlands
| | - J Balt
- St Antonius Hospital, Cardiology, Nieuwegein, Netherlands
| | - V Van Dijk
- St Antonius Hospital, Cardiology, Nieuwegein, Netherlands
| | - B Rensing
- St Antonius Hospital, Cardiology, Nieuwegein, Netherlands
| | - M Wijffels
- St Antonius Hospital, Cardiology, Nieuwegein, Netherlands
| | - L Boersma
- St Antonius Hospital, Cardiology, Nieuwegein, Netherlands
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Alipour A, Seifzadeh S, Aligholi H, Nami M. QEEG-based neural correlates of decision making in a well-trained eight year-old chess player. J Integr Neurosci 2017:JIN056. [PMID: 29081420 DOI: 10.3233/jin-170056] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
The neurocognitive substrates of decision making (DM) in the context of chess has appealed to researchers' interest for decades. Expert and beginner chess players are hypothesized to employ different brain functional networks when involved in episodes of critical DM upon chess. Cognitive capacities including, but not restricted to pattern recognition, visuospatial search, reasoning, planning and DM are perhaps the key determinants of rewarding and judgmental decisions in chess. Meanwhile, the precise neural correlates of DM in this context has largely remained elusive. The quantitative electroencephalography (QEEG) is an investigation tool possessing a proper temporal resolution in the study of neural correlates of cognitive tasks at cortical level. Here, we used a 22-channel EEG setup and digital polygraphy in a well-trained 8 year-old boy while engaged in playing chess against the computer. Quantitative analyses were done to map and source-localize the EEG signals. Our analyses indicated a lower power spectral density (PSD) for higher frequency bands in the right hemisphere upon DM-related epochs. Moreover, the information flow upon DM blocks in this particular case was more of posterior towards anterior brain regions.
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Affiliation(s)
- Abolfazl Alipour
- Department of Psychological and Brain Sciences, Indiana University, Bloomington, Indiana, USA
- Neuroscience Laboratory-NSL (Brain, Cognition and Behavior), Department of Neuroscience, School of Advanced Medical Sciences and Technologies, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Sahar Seifzadeh
- Young Researchers and Elite Club, Qazvin Branch, Islamic Azad University, Qazvin, Iran
| | - Hadi Aligholi
- Neuroscience Laboratory-NSL (Brain, Cognition and Behavior), Department of Neuroscience, School of Advanced Medical Sciences and Technologies, Shiraz University of Medical Sciences, Shiraz, Iran
- Department of Neuroscience, School of Advanced Medical Sciences and Technologies, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Mohammad Nami
- Neuroscience Laboratory-NSL (Brain, Cognition and Behavior), Department of Neuroscience, School of Advanced Medical Sciences and Technologies, Shiraz University of Medical Sciences, Shiraz, Iran
- Department of Neuroscience, School of Advanced Medical Sciences and Technologies, Shiraz University of Medical Sciences, Shiraz, Iran
- Clinical Neurology Research Center, Shiraz University of Medical Sciences, Shiraz, Iran
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Nijenhuis VJ, Alipour A, Wunderlich NC, Rensing BJWM, Gijsbers G, Ten Berg JM, Suttorp MJ, Boersma LVA, van der Heyden JAS, Swaans MJ. Feasibility of multiplane microtransoesophageal echocardiographic guidance in structural heart disease transcatheter interventions in adults. Neth Heart J 2017; 25:669-674. [PMID: 28887807 PMCID: PMC5691817 DOI: 10.1007/s12471-017-1036-6] [Citation(s) in RCA: 14] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
Abstract
Introduction Structural heart interventions are guided by transoesophageal or intracardiac echocardiography (TEE/ICE). MicroTEE, developed for paediatric purposes, is smaller and therefore less invasive and traumatic, avoiding the need for general anaesthesia. We aimed to show feasibility of procedural guidance by comparing image quality of microTEE with standard TEE and ICE during adult transcatheter interventions, and assess the accuracy in obtaining left atrial appendage (LAA) measurements between the microTEE probe and standard TEE. Methods and results We prospectively included 49 patients (20 women, 64 ± 18 years). Intraprocedural images were obtained by using the microTEE probe and standard (2D and 3D) TEE (LAA closure, MitraClip implantation) or ICE (interatrial communication closure, transseptal puncture for left atrial ablation). Two echocardiographers independently assessed image quality from 1 (excellent) to 4 (poor) and performed LAA measurements. Use of microTEE was not related to significant discomfort. Image quality obtained with the microTEE probe was lower than with standard TEE (2 [1–2] vs. 1 [1–2]; p = 0.04) and comparable with ICE images (2 [1–2] vs. 2 [1–2], p = 0.13). MicroTEE showed a wider field of view than ICE. LAA measurements on images obtained by microTEE were strongly associated with standard TEE. Conclusions MicroTEE seems feasible for guidance during transcatheter heart interventions in adults. MicroTEE imaging offers a wider field of view than ICE, and its accuracy is comparable with TEE. In transcatheter interventions performed under conscious sedation, microTEE might be a viable and advantageous alternative to standard TEE or ICE.
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Affiliation(s)
- V J Nijenhuis
- Department of Cardiology, St Antonius Hospital, Nieuwegein, The Netherlands.
| | - A Alipour
- Department of Cardiology, St Antonius Hospital, Nieuwegein, The Netherlands
| | - N C Wunderlich
- Department of Cardiology, Cardiovascular Centre Darmstadt, Darmstadt, Germany
| | - B J W M Rensing
- Department of Cardiology, St Antonius Hospital, Nieuwegein, The Netherlands
| | - G Gijsbers
- Philips Healthcare, Best, The Netherlands
| | - J M Ten Berg
- Department of Cardiology, St Antonius Hospital, Nieuwegein, The Netherlands
| | - M J Suttorp
- Department of Cardiology, St Antonius Hospital, Nieuwegein, The Netherlands
| | - L V A Boersma
- Department of Cardiology, St Antonius Hospital, Nieuwegein, The Netherlands
| | | | - M J Swaans
- Department of Cardiology, St Antonius Hospital, Nieuwegein, The Netherlands
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Alipour A, Mojdehfarahbakhsh A, Tavakolian A, Morshedzadeh T, Asadi M, Mehdizadeh A, Nami M. Neural communication through theta-gamma cross-frequency coupling in a bistable motion perception task. J Integr Neurosci 2016; 15:539-551. [PMID: 27931147 DOI: 10.1142/s0219635216500291] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [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: 11/18/2022] Open
Abstract
Functional significance of the neural oscillations has been debated since long. In particular, oscillations have been suggested to play a major role in formation of communication channels between brain regions. It has been previously suggested that gamma coherence increases during communication between hemispheres when subjects perceive a horizontal motion in Stroboscopic Alternative Motion (SAM) stimulus. In addition, disruption of this coherence may change the horizontal perception of SAM. In this study, we investigated the changes of Cross-Frequency Coupling (CFC) in EEG signals from parietal and occipital cortices during horizontal and vertical perception of SAM. Our results suggested that while the strength of CFC in parietal electrodes showed no significant change, CFC in P3-P4 electrode-pair demonstrated a significant correlation during horizontal perception of SAM. Therefore, the CFC between theta- and gamma-band oscillations seems to be correlated with changes in functional interactions between brain regions. Accordingly, we propose that in addition to gamma coherence, CFC is perhaps another neurophysiological mechanism involved in neural communication.
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Affiliation(s)
- Abolfazl Alipour
- * Students Research Committee, Shiraz University of Medical Sciences, Shiraz, Iran.,† Neuroscience Laboratory (Brain, Cognition and Behavior), Department of Neuroscience, School of Advanced Medical Sciences and Technologies, Shiraz University of Medical Sciences, Shiraz, Iran.,‡ Conscioustronics Foundation, Shiraz, Iran
| | | | - Ashkan Tavakolian
- ¶ Department of Physics, Collage of Science, Shiraz University, Shiraz, Iran
| | - Taha Morshedzadeh
- * Students Research Committee, Shiraz University of Medical Sciences, Shiraz, Iran.,∥ Faculty of Arts and Science, University of Toronto, Toronto, ON, Canada
| | - Maedeh Asadi
- * Students Research Committee, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Alireza Mehdizadeh
- ** Department of Medical Physics and Engineering, School of Medicine, Shiraz University of Medical Sciences Shiraz, Iran
| | - Mohammad Nami
- † Neuroscience Laboratory (Brain, Cognition and Behavior), Department of Neuroscience, School of Advanced Medical Sciences and Technologies, Shiraz University of Medical Sciences, Shiraz, Iran.,†† Department of Neuroscience, School of Advanced Medical Sciences and Technologies, Shiraz University of Medical Sciences, Shiraz, Iran.,‡‡ Shiraz Neuroscience Research Center, Shiraz University of Medical Sciences, Shiraz, Iran
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Sharma VK, Alipour A, Soran-Erdem Z, Kelestemur Y, Aykut ZG, Demir HV. Fluorescent Heterodoped Nanotetrapods as Synergistically Enhancing Positive and Negative Magnetic Resonance Imaging Contrast Agents. ACS Appl Mater Interfaces 2016; 8:12352-12359. [PMID: 27139918 DOI: 10.1021/acsami.6b02407] [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] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
In this work, we report Mn-Fe heterodoped ZnSe tetrapod nanocrystals (NCs) synthesized to synergistically enhance contrast in both T1- and T2-weighted magnetic resonance imaging (MRI). The proposed NCs were prepared using a customized heteroarchitecture such that the manganese (Mn) is confined in the core and iron (Fe) in the branches of the tetrapods. The elemental composition and profile of these NCs were studied using X-ray photoelectron spectroscopy, energy-dispersive X-ray spectroscopy, and inductively coupled plasma mass spectroscopy. Photoluminescence quantum yield of these heterodoped NCs in water is ∼30%. Magnetic measurements reveal the simultaneous presence of superparamagnetic and paramagnetic behavior in these NCs because of the coexistence of Mn(2+) and Fe(2+) dopants. Their potential as simultaneous positive and negative MRI contrast agents was demonstrated by relaxivity measurements and in vivo MRI. From the in vivo studies, we also found that these NCs (with a hydrodynamic diameter of 20 nm) are excreted from the body within 24 h after the injection. Therefore, these heterodoped tetrapods NCs, while being fluorescent and safe, hold great future as a synergistically enhancing dual-modal MRI contrast agent.
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Affiliation(s)
- V K Sharma
- LUMINOUS! Center of Excellence for Semiconductor Lighting and Displays, School of Electrical and Electronic Engineering, School of Physical and Mathematical Sciences, Nanyang Technological University , Singapore 639798, Singapore
- UNAM-Institute of Materials Science and Nanotechnology, UMRAM-National Magnetic Resonance Research Center, Department of Electrical and Electronics Engineering, Department of Physics, and Department of Molecular Biology and Genetics, Bilkent University , Ankara 06800, Turkey
| | - A Alipour
- LUMINOUS! Center of Excellence for Semiconductor Lighting and Displays, School of Electrical and Electronic Engineering, School of Physical and Mathematical Sciences, Nanyang Technological University , Singapore 639798, Singapore
| | - Z Soran-Erdem
- LUMINOUS! Center of Excellence for Semiconductor Lighting and Displays, School of Electrical and Electronic Engineering, School of Physical and Mathematical Sciences, Nanyang Technological University , Singapore 639798, Singapore
| | - Y Kelestemur
- LUMINOUS! Center of Excellence for Semiconductor Lighting and Displays, School of Electrical and Electronic Engineering, School of Physical and Mathematical Sciences, Nanyang Technological University , Singapore 639798, Singapore
| | - Z G Aykut
- LUMINOUS! Center of Excellence for Semiconductor Lighting and Displays, School of Electrical and Electronic Engineering, School of Physical and Mathematical Sciences, Nanyang Technological University , Singapore 639798, Singapore
| | - H V Demir
- LUMINOUS! Center of Excellence for Semiconductor Lighting and Displays, School of Electrical and Electronic Engineering, School of Physical and Mathematical Sciences, Nanyang Technological University , Singapore 639798, Singapore
- UNAM-Institute of Materials Science and Nanotechnology, UMRAM-National Magnetic Resonance Research Center, Department of Electrical and Electronics Engineering, Department of Physics, and Department of Molecular Biology and Genetics, Bilkent University , Ankara 06800, Turkey
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Tizkar B, Kazemi R, Alipour A, Seidavi A, Naseralavi G, Ponce-Palafox J. Effects of dietary supplementation with astaxanthin and β-carotene on the semen quality of goldfish (Carassius auratus). Theriogenology 2015; 84:1111-7. [DOI: 10.1016/j.theriogenology.2015.06.011] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2014] [Revised: 06/13/2015] [Accepted: 06/13/2015] [Indexed: 10/23/2022]
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Sharma VK, Alipour A, Soran-Erdem Z, Aykut ZG, Demir HV. Highly monodisperse low-magnetization magnetite nanocubes as simultaneous T(1)-T(2) MRI contrast agents. Nanoscale 2015; 7:10519-10526. [PMID: 26010145 DOI: 10.1039/c5nr00752f] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
We report the first study of highly monodisperse and crystalline iron oxide nanocubes with sub-nm controlled size distribution (9.7 ± 0.5 nm in size) that achieve simultaneous contrast enhancement in both T1- and T2-weighted magnetic resonance imaging (MRI). Here, we confirmed the magnetite structure of iron oxide nanocubes by X-ray diffraction (XRD), selected area electron diffraction (SAED) pattern, optical absorption and Fourier transformed infrared (FT-IR) spectra. These magnetite nanocubes exhibit superparamagnetic and paramagnetic behavior simultaneously by virtue of their finely controlled shape and size. The magnetic measurements reveal that the magnetic moment values are favorably much lower because of the small size and cubic shape of the nanoparticles, which results in an enhanced spin canting effect. As a proof-of-concept demonstration, we showed their potential as dual contrast agents for both T1- and T2-weighted MRI via phantom studies, in vivo imaging and relaxivity measurements. Therefore, these low-magnetization magnetite nanocubes, while being non-toxic and bio-compatible, hold great promise as excellent dual-mode T1 and T2 contrast agents for MRI.
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Affiliation(s)
- V K Sharma
- UNAM-Institute of Materials Science and Nanotechnology, National Magnetic Resonance Research Center (UMRAM), Department of Electrical and Electronics Engineering, Department of Physics, Department of Molecular Biology and Genetics, Bilkent University, Ankara, 06800, Turkey
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de Vries M, Alipour A, Klop B, van de Geijn G, Janssen J, Njo T, Rietveld A, Liem A, de Herder W, Cabezas MC. Postprandial glucose-dependent leukocyte activation in patients with different ranges of insulin sensitivity. Atherosclerosis 2014. [DOI: 10.1016/j.atherosclerosis.2014.05.386] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Movahedi MM, Alipour A, Mortazavi SAR, Tayebi M. Production of a Novel Mineral-based Sun Lotion for Protecting the Skin from Biohazards of Electromagnetic Radiation in the UV Region. J Biomed Phys Eng 2014; 4:9-12. [PMID: 25505763 PMCID: PMC4258857] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2013] [Accepted: 09/19/2013] [Indexed: 06/04/2023]
Abstract
BACKGROUND Sun protection materials have been one of the major concerns in pharmaceutical in-dustry since almost one century ago. Various materials have been found to have such an effect but there are still many unknown substances that have not been discovered. Objective : To introduce a novel mineral-based sun lotion with considerable UV absorption properties compared to commercially available sunscreens. METHOD UV absorption properties of transparent plas-tic sheets covered by a uniform cream layer of different mineral-based sun lotions and a commercially available sun lotion were tested. RESULTS Sun lotions containing specific proportion of bentonite and zeolite minerals were capable of absorbing the highest level of UV light com-pared to that of the commercially available sun lotion. CONCLUSION Mineral-based sun lotions can be considered as cost effective alternatives for current commercial sunscreens.
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Affiliation(s)
- M M Movahedi
- Medical Physics Department, School of Medicine, Shiraz University of Medical Sciences, Shiraz, Iran
| | - A Alipour
- Pharmacy Student, Student Research Committee, School of Pharmacy, Shiraz University of Medical Sciences, Shiraz, Iran
| | - S A R Mortazavi
- Medical Student, Student Research Committee, School of Medicine, Shiraz University of Medical Sciences, Shiraz, Iran
| | - M Tayebi
- The Center for Research on Protection against Ionizing and Non-ionizing Radiation, School of Paramedical Sciences, Shiraz University of Medical Sciences, Shiraz, Iran
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Mokarram P, Rismanchi M, Alizadeh Naeeni M, Mirab Samiee S, Paryan M, Alipour A, Honardar Z, Kavousipour S, Naghibalhossaini F, Mostafavi-Pour Z, Monabati A, Hosseni SV, Shamsdin SA. Microsatellite instability typing in serum and tissue of patients with colorectal cancer: comparing real time PCR with hybridization probe and high-performance liquid chromatography. Mol Biol Rep 2014; 41:2835-44. [DOI: 10.1007/s11033-014-3138-1] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2013] [Accepted: 01/11/2014] [Indexed: 01/06/2023]
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Alipour A, Rezaianzadeh A, Hasanzadeh J, Rajaeefard A, Davarpanah MA, Hasanabadi M. High prevalence of HCV coinfection in HIV-infected individuals in Shiraz, Islamic Republic of Iran. East Mediterr Health J 2013; 19:975-981. [PMID: 24684094] [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: 06/03/2023]
Abstract
We carried out a cross-sectional survey in Shiraz to determine the prevalence of hepatitis C virus (HCV) in 1 444 individuals infected with human immunodeficiency virus (HIV). We also determined the risk factors for this coinfection. Demographic and behavioural data were obtained using a standard questionnaire. The prevalence of HIV-HCV coinfection was 78.4% (95% CI: 76.3-80.5). Intravenous drug use (OR = 7.2; 95% CI: 4.9-10.6), imprisonment (OR = 6.9; 95% CI: 4.6-10.4), tattooing in prison (OR = 2.61; 95% CI: 1.4-4.8), tattooing out of prison (OR = 2.0; 95% CI: 1.3-3.1) and age (OR = 1.02 with increasing each year of life; 95% CI: 1.0-1.04) were significantly associated with HCV-HIV coinfection. Prevalence of HCV-HIV coinfection is high in Shiraz. Intravenous drug use and imprisonment are the main risk factors for this coinfection. Therefore, serious implementation of HIV and HCV testing, education, prevention, care and treatment programmes and evaluation of harm reduction programmes in prisons are very important.
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Alipour A, Rezaianzadeh A, Hasanzadeh J, Rajaeefard A, Davarpanah M, Hasanabadi M. High prevalence of HCV coinfection in HIV-infected individuals in Shiraz, Islamic Republic of Iran. East Mediterr Health J 2013. [DOI: 10.26719/2013.19.12.975] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Movahedi MM, Mehdizadeh A, Alipour A. Development of a Brain Computer Interface (BCI) Speller System Based on SSVEP Signals. J Biomed Phys Eng 2013; 3:81-86. [PMID: 25505751 PMCID: PMC4204500] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2013] [Accepted: 08/27/2013] [Indexed: 06/04/2023]
Abstract
BCI is one of the most intriguing technologies among other HCI systems, mostly because of its capability of recording brain activities. Spelling BCIs, which help paralyzed people to maintain communication, are one of the striking topics in the field of BCI. In this scientific a spelling BCI system with high transfer rate and accuracy that uses SSVEP signals is proposed. In addition, we suggested that LED light sources can provide proper signals for speller BCIs and they can be used in future.
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Affiliation(s)
- Mohammad Mehdi Movahedi
- Faculty Member of Medical Physics and Medical Engineering, Department of Medical Physics and Medical Engineering, School of Medicine, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Alireza Mehdizadeh
- Assistant Professor of Medical Physics and Medical Engineering, Department of Medical Physics and Medical Engineering, School of Medicine, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Abolfazl Alipour
- Conscioustronics foundation, Shiraz, Iran
- School of pharmacy, Shiraz University of Medical Sciences, Shiraz, Iran
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Alipour A, Naderi G, Bakhshandeh GR, Vali H, Shokoohi S. Elastomer Nanocomposites Based on NR/EPDM/Organoclay: Morphology and Properties. INT POLYM PROC 2013. [DOI: 10.3139/217.2381] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Abstract
Natural rubber/Ethylene Propylene Diene Monomer (NR/EPDM) blends of five different compositions (0/100), (25/75), (50/50), (75/25) and (100/0) with 1, 3, 5 and 7 phr organo-modified nanoclay (Cloisite 15A) were prepared by two-roll mill. The effect of organo-modified layered nanosilicates and composition on the cure characteristics, microstructure, mechanical, and rheological properties of the nanocomposites were studied. Results suggested the intercalation of polymer chains into the silicate layers which was evidenced by d-spacing results of X-ray diffraction patterns. TEM micrographs also directly confirmed XRD results. Mechanical properties of the nanocomposites depicted a nearly 40% percents increase respectively in the tensile modulus of 75NR/25EPDM containing 7 wt.% nanoclay.
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Affiliation(s)
- A. Alipour
- Department of Polymer Engineering, Faculty of Graduate studies, Tehran South Branch, Azad University, Tehran, Iran
| | - G. Naderi
- Department of Rubber, Iran Polymer and Petrochemical Institute, Tehran, Iran
| | - G. R. Bakhshandeh
- Department of Rubber, Iran Polymer and Petrochemical Institute, Tehran, Iran
| | - H. Vali
- Department of Earth and Planetary Sciences, McGill University, Montreal, Quebec, Canada
| | - S. Shokoohi
- Polymer Engineering Department, Amirkabir University of Technology, Tehran, Iran
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Emdad R, Alipour A, Hagberg J, Jensen IB. Comment on "can observations of workplace bullying really make you depressed? A response to Emdad et al. 2013" by Nielsen and Einarsen. Int Arch Occup Environ Health 2013; 86:723-4. [PMID: 23543008 DOI: 10.1007/s00420-013-0869-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2013] [Accepted: 03/15/2013] [Indexed: 12/01/2022]
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Alipour A, Zare H, Poursharifi H, Aerab Sheibani K, Ardekani MA. The intermediary role of self-efficacy in relation with stress, glycosylated haemoglobin and health-related quality of life in patients with type2 diabetes. Iran J Public Health 2012; 41:76-80. [PMID: 23641394 PMCID: PMC3640785] [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] [Download PDF] [Subscribe] [Scholar Register] [Received: 02/12/2012] [Accepted: 09/15/2012] [Indexed: 11/15/2022]
Abstract
BACKGROUND Stress is not always a direct result of stressful conditions, but rather the way they are perceived. Thus individual variables that may be associated with perceived stress should be examined in stress studies. This study investigates the intermediary role of self-efficacy in relation with stress, glycosylated haemoglobin and health-related quality of life in patients with type2 diabetes. METHODS All women with diabetes in Yazd Diabetes Research Centre, in 2012, were considered and 80 women were selected by random sampling. They completed Shirer's self-efficacy scale questionnaire, depression, anxiety and stress scale (DASS), and ADDQ0L19 questionnaire. Then they were introduced to the lab for blood test. Data were analysed by SPSS software and stepwise regression method. RESULTS Pearson correlation test results showed that the hemoglobin A1c (r = 0.35) and Quality of Life (r = -0.22) are associated with stress (P <0.05). As so hemoglobin A1c (r = 0.83) and Quality of Life (r = 0.37) with variable of self efficacy are associated positively and significantly (P <0.05). Results of stepwise regression also showed that self efficacy and stress scales 0.697 of variance hemoglobin A1c and 0.140 of variance of Quality of life explaining to do. CONCLUSION The impact of stress on blood sugar and patients' health-related quality of life can be influenced by their self-efficacy; therefore it is suggested that an educational intervention is done to increase patients' self-efficacy to better cope with stress in their life.
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Affiliation(s)
- A Alipour
- Dept. of Psychology, Payame Noor University, Tehran, Iran
| | - H Zare
- Dept. of Psychology, Payame Noor University, Tehran, Iran
| | - H Poursharifi
- Dept. of psychology, School of Psychology and Educational Sciences, Tabriz University, Tabriz, Iran
| | | | - M Afkhami Ardekani
- Dept. of Ophthalmology, Shahid Sadoughi university of Medical Science, Yazd Diabetes Research Center, Yazd, Iran
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Emdad R, Alipour A, Hagberg J, Jensen IB. The impact of bystanding to workplace bullying on symptoms of depression among women and men in industry in Sweden: an empirical and theoretical longitudinal study. Int Arch Occup Environ Health 2012; 86:709-16. [PMID: 22940902 PMCID: PMC3722445 DOI: 10.1007/s00420-012-0813-1] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2012] [Accepted: 08/15/2012] [Indexed: 11/30/2022]
Abstract
Background Prospective studies on bystanding to workplace bullying and the health outcomes are scarce. Aim To investigate the work environmental risk factors of depressive symptoms among bystanders to bullying in both women and men in four large industrial organizations in Sweden. Method The number of respondents at four large industrial enterprises with more than one year at the workplace at T1: n = 2,563 (Women: n = 342; Men: n = 2,227). Bystanders to bullying at T1: n = 305 (Women: n = 30; Men: n = 275). The total number of those with symptoms of depression at T2: Women: n = 30; Men: n = 161. Two thousand one hundred and seventy-seven employees answered the questionnaire on T1 and T2 with an 18-month interval. “To have depressive symptoms” was defined as not having depressive symptoms at T1 but having depressive symptoms at T2. Results The number of men who were bystanders to bullying was larger compared to women. However, the proportion of women who were bystanders to bullying and developed depressive symptoms 18 months later was higher in comparison with men (33.3 and 16.4 %, respectively). Further, “Being a bystander to bullying” 1.69 (1.13–2.53), “Rumors of changes in the workplace” 1.53 (1.10–2.14), “Reduced role clarity” 2.30 (1.21–4.32), “Lack of appreciation of being in the group” 1.76 (1.22–2.53) increased the risk of future symptoms of depression. “Job Strain” was not an adjusted risk factor for depression. Conclusion Our results support previous findings that bystanding to workplace bullying is related to future depressive symptoms.
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Affiliation(s)
- R Emdad
- Karolinska Institutet, Institute of Environmental Medicine, Division of Occupational and Enviromental Medicine, Unit of Intervention and Implementation Research, PO Box 210, 171 77, Stockholm, Sweden.
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Noorbala AA, Heris MA, Alipour A, Mousavi E, Farazi G. Mental health and well-being in different levels of perceived discrimination. Iran J Public Health 2012; 41:46-54. [PMID: 23113164 PMCID: PMC3481618] [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] [Download PDF] [Subscribe] [Scholar Register] [Received: 07/26/2011] [Accepted: 01/12/2012] [Indexed: 11/09/2022]
Abstract
BACKGROUND To compare mental health and well-being in different levels of the perceived discrimination among Iranian people living in Tehran. METHOD Using multi-stage sampling, 1255 subjects with the average age of 45 years and 9 months (including 672 women and 583 men) were selected and they completed all items of the general health questionnaire (GHQ), the social well-being inventory (SWI), personal well-being inventory (PWI), and a question to assess the perceived discrimination. RESULTS Data analysis by Kruskal-Wallis test revealed that there were significant differences between physical symptoms (χ(2)=5.93, P<0.05) and depression (χ (2)=15.70, P<0.05), the subscales of mental health in different levels of the perceived discrimination. Furthermore, comparing personal well-being scores and its subscales in different levels of the perceived discrimination showed significant differences in personal hygiene (χ(2)=7.20, P<0.05), and security in future (χ(2)=7.60, P<0.05). Emotional well-being (χ(2)=12.25, P<0.05), self-rule (χ(2)=7.45, P<0.05), personal growth (χ(2)=19.87, P<0.05), and psychological well-being (χ(2)= 9.09, P<0.05) were significantly different in different levels of the perceived discrimination, too. Moreover, comparing social well-being in different levels of the perceived discrimination indicated significant differences between social acceptance (χ (2)=14.91, P<0.05), and social participation (χ (2)= 10.91, P<0.05). CONCLUSION Therefore, people are more active in society, increases the possibility of encountering with discrimination and consequently the perception of that.
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Affiliation(s)
- AA Noorbala
- Dept. of Psychiatry, Tehran University of Medical Science, Tehran, Iran,Corresponding Author: E-mail address:
| | - M Agah Heris
- Dept. of Psychology, Payam Noor University, Tehran, Iran
| | - A Alipour
- Dept. of Psychology, Payam Noor University, Tehran, Iran
| | - E Mousavi
- Dept. of Psychology, Payam Noor University, Tehran, Iran
| | - G Farazi
- Dept. of Psychology, Payam Noor University, Tehran, Iran
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Ziaie F, Hajiloo N, Alipour A, Amraei R, Mehtieva SI. Retrospective dosimetry using synthesized nano-structure hydroxyapatite. Radiat Prot Dosimetry 2011; 145:377-384. [PMID: 21131666 DOI: 10.1093/rpd/ncq443] [Citation(s) in RCA: 6] [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: 05/30/2023]
Abstract
Micro and nano-structure hydroxyapatite samples were synthesized via several different methods. The samples were characterised utilising the Fourier transmission infra-red, scanning electron microscope and X-ray diffraction methods, to find out the structure most similar to human tooth enamel, and the best method was found. The electron paramagnetic resonance (EPR) signals of the gamma-irradiated samples were measured using an EPR spectrometer system. A calibration curve was established by irradiation of the samples at four doses of 50-500 mGy. The parameters of the calibration curve, slope and intercept with dose axis are determined by linear regression analysis. This calibration curve can be used for human tooth enamel for retrospective dosimetry purposes.
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Affiliation(s)
- F Ziaie
- Agricultural, Medical and Industrial Research School, Nuclear Science and Technology Research Institute, PO Box 31485-498, Karaj, Iran.
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Klop B, Alipour A, Westzaan A, Birnie E, van de Geijn G, Njo T, Janssen J, van der Meulen N, Elte J, Rietveld A, Castro Cabezas M. 394 MANNOSE BINDING LECTIN AS CARDIOVASCULAR RISK FACTOR: A COHORT STUDY. ATHEROSCLEROSIS SUPP 2011. [DOI: 10.1016/s1567-5688(11)70395-6] [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: 11/28/2022]
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Alipour A, Shojaee S, Mohebali M, Tehranidoost M, Abdi Masoleh F, Keshavarz H. Toxoplasma infection in schizophrenia patients: a comparative study with control group. Iran J Parasitol 2011; 6:31-7. [PMID: 22347285 PMCID: PMC3279881] [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] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/23/2010] [Accepted: 05/09/2011] [Indexed: 11/04/2022]
Abstract
BACKGROUND Schizophrenia is a serious, chronic, and often debilitating neuropsychiatric disorder. Its causes are still poorly understood. Besides genetic and non-genetic (environmental) factors are thought to be important as the cause of the structural and functional deficits that characterize schizophrenia. This study aimed to compare Toxoplasma gondii infection between schizophrenia patients and non-schizophrenia individuals as control group. METHODS A case-control study was designed in Tehran, Iran during 2009-2010. Sixty-two patients with schizophrenia and 62 non-schizophrenia volunteers were selected. To ascertain a possible relationship between T. gondii infection and schizophrenia, anti-Toxoplasma IgG antibodies were detected by indirect-ELISA. Data were statistically analyzed by chi- square at a confidence level of 99%. RESULTS The sero-positivity rate among patients with schizophrenia (67.7%) was significantly higher than control group (37.1) (P <0. 01). CONCLUSION A significant correlation between Toxoplasma infection and schizophrenia might be expected.
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Affiliation(s)
- A Alipour
- Department of Parasitology and Mycology, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran,Center for Research of Endemic Parasites of Iran (CREPI), Tehran University of Medical Sciences, Tehran, Iran
| | - S Shojaee
- Department of Parasitology and Mycology, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran,Center for Research of Endemic Parasites of Iran (CREPI), Tehran University of Medical Sciences, Tehran, Iran
| | - M Mohebali
- Department of Parasitology and Mycology, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran,Center for Research of Endemic Parasites of Iran (CREPI), Tehran University of Medical Sciences, Tehran, Iran
| | - M Tehranidoost
- Dept. of Psychiatry, Roozbeh Hospital, Tehran University of Medical Sciences Tehran, Iran
| | - F Abdi Masoleh
- Dept. of Psychiatry, Roozbeh Hospital, Tehran University of Medical Sciences Tehran, Iran
| | - H Keshavarz
- Department of Parasitology and Mycology, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran,Center for Research of Endemic Parasites of Iran (CREPI), Tehran University of Medical Sciences, Tehran, Iran,Corresponding Author: Fax: 00982188951392.
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Neghab M, Soltanzadeh A, Alipour A. Toxic response of the respiratory system as a result of exposure to high concentrations of wheat flour dust. Toxicol Lett 2010. [DOI: 10.1016/j.toxlet.2010.03.266] [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: 10/19/2022]
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Bovenberg SA, Alipour A, Elte JWF, Rietveld AP, Janssen JW, van de Geijn GJ, Njo TN, van Mechelen R, Hervas SM, Cabezas MC. Cell-mediated lipoprotein transport: a novel anti-atherogenic concept. ATHEROSCLEROSIS SUPP 2010; 11:25-9. [PMID: 20427243 DOI: 10.1016/j.atherosclerosissup.2010.04.003] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2010] [Revised: 04/02/2010] [Accepted: 04/07/2010] [Indexed: 12/16/2022]
Abstract
Lipoprotein transport is thought to occur in the plasma compartment of the blood, where lipoproteins are modulated by various enzymatic reactions. Subsequently, lipoproteins can migrate through the endothelial barrier to the subendothelial space or are taken up by the liver. The interaction between pro-atherogenic (apoB-containing) lipoproteins and blood cells (especially monocytes and macrophages) in the subendothelial space is well known. This lipoprotein-inflammatory cell interplay is central in the development of the atherosclerotic plaque. In this review, a novel interaction is described between lipoproteins and both leukocytes and erythrocytes in the blood compartment. This lipoprotein-blood cell interaction may also be related to the process of atherosclerosis by inducing inflammatory changes in the case of leukocytes (pro-atherogenic) and as an anti-atherogenic transport-system by adherence to erythrocytes. Triglyceride rich lipoprotein (TRL)-mediated leukocyte activation can lead to an inflammatory situation with generation of oxidative stress and the production of cytokines, ultimately resulting in acute endothelial dysfunction. Binding of apoB containing lipoproteins to erythrocytes may be a potential anti-atherogenic mechanism protecting the vessel wall from the pro-inflammatory effects of these lipoproteins and also playing a role in the removal of these particles from the circulation. One of the proposed mechanisms of this interaction implies complement activation on the lipoprotein surface and binding to the Complement Receptor 1 (CR1) on erythrocytes and leukocytes, followed by clearance by the liver.
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Affiliation(s)
- S A Bovenberg
- Department of Internal Medicine, Sint Franciscus Gasthuis, Rotterdam, The Netherlands
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Alipour A, van Oostrom AJHHM, Van Wijk JPH, Verseyden C, Plokker HWM, Jukema JW, Rabelink AJ, Castro Cabezas M. Mannose binding lectin deficiency and triglyceride-rich lipoprotein metabolism in normolipidemic subjects. Atherosclerosis 2009; 206:444-50. [PMID: 19380135 DOI: 10.1016/j.atherosclerosis.2009.03.007] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/10/2008] [Revised: 02/22/2009] [Accepted: 03/05/2009] [Indexed: 11/28/2022]
Abstract
Mannose binding lectin (MBL) is one of the three initiators of complement activation and is therefore closely linked to inflammation. MBL deficiency has been associated with the generation of atherosclerosis. Since atherosclerosis, the complement system and postprandial lipemia are linked to inflammation, we studied postprandial lipoprotein metabolism in MBL deficiency. An observational study was carried out in 107 volunteers (21% MBL deficient). Classical cardiovascular risk factors were not different between subjects with and without MBL deficiency. Oral fat loading tests in 8 MBL deficient and 14 MBL sufficient subjects showed similar postprandial triglyceride, free fatty acid, hydroxybutyric acid and complement component 3 concentrations. MBL deficient subjects had 2.4 times lower postprandial Sf>400 (chylomicron)-apoB48 concentrations, but in contrast a 2-3.5 times increased Sf 60-400 (VLDL1-TG) and Sf 60-400-apoB100 response. MBL activity was inversely related to the postprandial Sf 60-400-TG increase. Despite lower postprandial Sf>400-apoB48 concentrations, MBL deficient subjects show an accumulation of Sf 60-400 lipoproteins.
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Affiliation(s)
- A Alipour
- Department of Internal Medicine, Sint Franciscus Gasthuis, Rotterdam, The Netherlands
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van Oostrom AJHHM, Alipour A, Sijmonsma TP, Verseyden C, Dallinga-Thie GM, Plokker HWM, Castro Cabezas M. Comparison of different methods to investigate postprandial lipaemia. Neth J Med 2009; 67:13-20. [PMID: 19155542] [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: 05/27/2023]
Abstract
Postprandial hyperlipidaemia has been associated with coronary artery disease (CAD). We investigated which of the generally used methods to test postprandial lipaemia differentiated best between patients with premature CAD (50+/-4 years, n=20) and healthy controls. Furthermore, the effects of rosuvastatin 40 mg/day on postprandial parameters were assessed. Standardised oral fat-loading tests (OFLT) and ambulant self-measurements of daylong capillary triglycerides (TGc) were performed. Total responses of individual lipoproteins, plasma TG (TGp) and remnant-like particle cholesterol (RLP-C) were estimated as area under the curve (AUC). Most AUCs were highest in untreated patients and reached control levels after rosuvastatin. From all AUCs, RLP-C-AUC was best associated to TGp-AUC in untreated patients and controls (adjusted R2=0.84, beta=0.92, p.
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Alipour A, van Oostrom A, Van Wijk J, Verseyden C, Plokker H, Jukema J, Rabelink A, Cabezas MC. Dissociation of postprandial clearance of chylomicrons and VLDL1 in MBL deficiency: Role of the innate immune system in postprandial lipemia? ATHEROSCLEROSIS SUPP 2008. [DOI: 10.1016/j.atherosclerosissup.2008.09.408] [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: 10/21/2022]
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Castro Cabezas M, Alipour A, Verseyden C, Salazar J, Masana L, Ribalta J. MTP-493G/T GENE POLYMORPHISM AND POSTPRANDIAL LIPEMIA IN FAMILIAL COMBINED HYPERLIPIDEMIA: EFFECTS OF TREATMENT WITH ATORVASTATIN. ATHEROSCLEROSIS SUPP 2008. [DOI: 10.1016/s1567-5688(08)70156-9] [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: 10/22/2022]
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Ghaffari M, Alipour A, Farshad AA, Jensen I, Josephson M, Vingard E. Effect of psychosocial factors on low back pain in industrial workers. Occup Med (Lond) 2008; 58:341-7. [DOI: 10.1093/occmed/kqn006] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
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Abstract
Postprandial hyperlipidaemia is a common metabolic disturbance in atherosclerosis. During the postprandial phase, chylomicrons and their remnants can penetrate the intact endothelium and cause foam cell formation. These particles are highly atherogenic after modification. People in the Western world are non-fasting for most of the day, which consequently leads to a continuous challenge of the endothelium by atherogenic lipoproteins and their remnants. Furthermore, atherosclerosis is considered a low-grade chronic inflammatory disease. Many studies have shown that the process of atherogenesis in part starts with the interaction between the activated leucocytes and activated endothelium. Postprandial lipoproteins can activate leucocytes in the blood and up-regulate the expression of leucocyte adhesion molecules on the endothelium, facilitating adhesion and migration of inflammatory cells into the subendothelial space. Another inflammatory process associated with postprandial lipaemia is the activation of the complement system. Its central component C3 has been associated with obesity, coronary sclerosis, the metabolic syndrome and fasting and postprandial TAGs (triacylglycerols). Moreover, chylomicrons are the strongest stimulators of adipocyte C3 production via activation of the alternative complement cascade. A postprandial C3 increment has been shown in healthy subjects and in patients with CAD (coronary artery disease) and with FCHL (familial combined hyperlipidaemia). Postprandial lipaemia has been related to TAG and free fatty acid metabolism. All of these mechanisms provide an alternative explanation for the atherogenicity of the postprandial period.
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Affiliation(s)
- A Alipour
- Department of Internal Medicine, St Franciscus Gasthuis, Center for Diabetes and Vascular Medicine, PO Box 10900, 3004 BA Rotterdam, The Netherlands
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Alipour A, de Vries W, Njo T, Janssen J, van Mechelen R, Elte J, Castro Cabezas M. PO9-267 INCREASED FASTING AND POSTPRANDIAL LEUKOCYTE ACTIVATION IN LONGSTANDING DIABETES COMPARED TO NEWLY-ONSET. ATHEROSCLEROSIS SUPP 2007. [DOI: 10.1016/s1567-5688(07)71277-1] [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: 11/27/2022]
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van Oostrom A, Alipour A, Sijmonsma T, Verseyden C, Dallinga-Thie G, Plokker H, Castro Cabezas M. PO23-778 COMPARISON OF DIFFERENT METHODS TO STUDY POSTPRANDIAL LIPEMIA AND EFFECTS OF ROSUVASTATIN IN PATIENTS WITH INSULIN RESISTANCE AND PREMATURE CORONARY SCLEROSIS. ATHEROSCLEROSIS SUPP 2007. [DOI: 10.1016/s1567-5688(07)71788-9] [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: 11/29/2022]
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Affiliation(s)
- A. Alipour
- a Faculty of Chemistry and Chemical Engineering , Iran University of Science and Technology , Tehran, Iran
| | - H. Jazayeri
- a Faculty of Chemistry and Chemical Engineering , Iran University of Science and Technology , Tehran, Iran
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Goudriaan N, Alipour A, Njo T, Van Mechelen R, Castro Cabezas M, Janssen J. Tu-P7:229 Mannose binding lectin serum levels and genotype are not associated with significant coronary sclerosis in Dutch patients. ATHEROSCLEROSIS SUPP 2006. [DOI: 10.1016/s1567-5688(06)80933-5] [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: 11/30/2022]
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