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Mohebbi H, Siasi E, Khosravipour A, Asghari M, Amini A, Mostafavinia A, Bayat M. MicroRNA-26 and Related Osteogenic Target Genes Could Play Pivotal Roles in Photobiomodulation and Adipose-Derived Stem Cells-Based Healing of Critical Size Foot Defects in the Rat Model. Photobiomodul Photomed Laser Surg 2023; 41:539-548. [PMID: 37788453 DOI: 10.1089/photob.2022.0128] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/05/2023] Open
Abstract
Objective: In this study, we aimed to explore the role of MicroRNA-26 in photobiomodulation (PBM)- and adipose-derived stem cell (ADS)-based healing of critical-sized foot fractures in a rat model. Background: PBM and ADS treatments are relatively invasive methods for treating bone defects. Specific and oriented cellular and molecular functions can be induced by applying an appropriate type of PBM and ADS treatment. Methods: A critical size foot defect (CSFD) is induced in femoral bones of 24 rats. Then, a human demineralized bone matrix scaffold (hDBMS) was engrafted into all CSFDs. The rats were randomly allocated into four groups (n = 6): (1) control (hDBMS); (2) hDBMS+human ADSs (hADSs), hADSs engrafted into CSFDs; (3) hDBMS+PBM, CSFD exposed to PBM (810 nm wavelength, 1.2 J/cm2 energy density); and (4) hDBMS+(hADSs+PBM), hADSs implanted into the CSFD and then exposed to PBM. At 42 days after CSFD induction, the rats were killed, and the left CSFD was removed for mechanical compression tests and the right CSFD was removed for molecular and histological studies. Results: The results indicate that miRNA-26a, BMP, SMAD, RUNX, and OSTREX had higher expression in the treated groups than in the control group. Further, the biomechanical and histological properties of CSFDs in treated groups were improved compared with the control group. Correlation tests revealed a positive relationship between microRNA and improved biomechanical and cellular parameters of CSFDs in the rat model. Conclusions: We concluded that the MicroRNA-26 signaling pathway probably plays a significant role in the hADS-, PBM-, and hADS+PBM-based healing of CSFDs in rats. Clinical Trial Registration number: IR.SBMU.MSP.REC.1398.980.
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Affiliation(s)
- Hanieh Mohebbi
- Department of Genetics, Faculty of Biological Sciences, North Tehran Branch, Islamic Azad University, Tehran, Iran
| | - Elham Siasi
- Department of Genetics, Faculty of Biological Sciences, North Tehran Branch, Islamic Azad University, Tehran, Iran
| | - Armin Khosravipour
- Department of Biology and Anatomical Sciences, Shahid Beheshti University of Medical Sciences (SBMU), Tehran, Iran
| | - Mohammadali Asghari
- Cellular and Molecular Biology Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Abdollah Amini
- Department of Genetics, Faculty of Biological Sciences, North Tehran Branch, Islamic Azad University, Tehran, Iran
- Department of Biology and Anatomical Sciences, Shahid Beheshti University of Medical Sciences (SBMU), Tehran, Iran
| | | | - Mohammad Bayat
- Department of Biology and Anatomical Sciences, Shahid Beheshti University of Medical Sciences (SBMU), Tehran, Iran
- Price Institute of Surgical Research, University of Louisville, and Noveratech LLC, Louisville, Kentucky, USA
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Omidi H, Sohrabi K, Amini A, Fathabady FF, Mostafavinia A, Ahmadi H, Mirzaei M, Moravej FG, Asghari M, Rezaei F, Gachkar L, Chien S, Bayat M. Application of combined photobiomodulation and curcumin-loaded iron oxide nanoparticles considerably enhanced repair in an infected, delayed-repair wound model in diabetic rats compared to either treatment alone. Photochem Photobiol Sci 2023; 22:1791-1807. [PMID: 37039961 DOI: 10.1007/s43630-023-00411-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2022] [Accepted: 03/20/2023] [Indexed: 04/12/2023]
Abstract
Herein, we attempted to evaluate the therapeutic potential of photobiomodulation (PBM) and curcumin-loaded iron nanoparticles (CUR), alone and in combination, on wound closure rate (WCR), microbial flora by measuring colony-forming units (CFUs), the stereological and biomechanical properties of repairing wounds in the maturation stage of the wound healing course in an ischemic infected delayed healing wound model (IIDHWM) of type I diabetic (TIDM) rats. There were four groups: group 1 was the control, group 2 received CUR, rats in group 3 were exposed to PBM (80 Hz, 890 nm, and 0.2 J/cm2), and rats in group 4 received both PBM and CUR (PBM + CUR). We found CFU was decreased in groups 2, 3, and 4 compared to group 1 (p = 0.000 for all). Groups 2, 3, and 4 showed a considerable escalation in WCR compared to group 1 (p = 0.000 for all). In terms of wound strength parameters, substantial increases in bending stiffness and high-stress load were observed in groups 2, 3, and 4 compared to group 1 (p = 0.000 for all). Stereological examinations revealed decreases in neutrophil and macrophage counts and increases in fibroblast counts in groups 2, 3, and 4compared to group 1 (p = 0.000 for all). Blood vessel counts were more dominant in the PBM and PBM + CUR groups over group 1 (p = 0.000 for all). CFU and wound strength as well as macrophage, neutrophil, and fibroblast counts were found to be improved in the PBM + CUR and PBM groups compared to the CUR group (ranging from p = 0.000 to p < 0.05). Better results were achieved in the PBM + CUR treatment over the PBM therapy. We determined therapy with PBM + CUR, PBM alone, and CUR alone substantially accelerated diabetic wound healing in an IIDHWM of TIDM rats compared to control group. Concomitantly, the PBM + CUR and PBM groups attained significantly enhanced results for WCR, stereological parameters, and wound strength than the CUR group, with the PBM + CUR results being superior to those of the PBM group.
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Affiliation(s)
- Hamidreza Omidi
- Department of Biology and Anatomical Sciences, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Kaysan Sohrabi
- School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Abdollah Amini
- Department of Biology and Anatomical Sciences, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
| | - Fatemeh Fadaei Fathabady
- Department of Biology and Anatomical Sciences, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Atarodalsadat Mostafavinia
- Department of Anatomical Sciences and Cognitive Neuroscience, School of Medicine, Tehran Medical Sciences, Islamic Azad University, Tehran, Iran
| | - Houssein Ahmadi
- Department of Biology and Anatomical Sciences, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Mansooreh Mirzaei
- Department of Anatomy, School of Medicine, Mazandaran University of Medical Sciences, Sari, Iran
| | - Fahimeh Ghasemi Moravej
- Department of Biology and Anatomical Sciences, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Mohammadali Asghari
- School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | | | - Latif Gachkar
- Infectious Diseases and Tropical Medicine Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran
- Department of Infectious Diseases, Loghman Hakim Hospital, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Sufan Chien
- Price Institute of Surgical Research, University of Louisville and Noveratech LLC, Louisville, KY, USA
| | - Mohammad Bayat
- Department of Biology and Anatomical Sciences, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
- Price Institute of Surgical Research, University of Louisville and Noveratech LLC, Louisville, KY, USA.
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Razeghian E, Kameh MC, Shafiee S, Khalafi F, Jafari F, Asghari M, Kazemi K, Ilkhani S, Shariatzadeh S, Haj-Mirzaian A. The role of the natural killer (NK) cell modulation in breast cancer incidence and progress. Mol Biol Rep 2022; 49:10935-10948. [PMID: 36008609 DOI: 10.1007/s11033-022-07865-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2022] [Accepted: 08/11/2022] [Indexed: 01/11/2023]
Abstract
The importance of the immune system on tumor surveillance has been investigated for many years, and its impact on controlling tumor progression has been verified. An important subgroup of the innate immune system is natural killer (NK) cells, whose essential function in modulating tumor behavior and suppressing metastasis and tumor growth has been demonstrated. The first idea of NK cells' crucial biological processes was demonstrated through their potent ability to conduct direct cellular cytotoxicity, even without former sensitization. These properties of NK cells allow them to recognize transformed cells that have attenuated self-ligand and express stress-induced ligands. Furthermore, secretion of various cytokines and chemokines after their activation leads to tumor elimination via either direct cytotoxic effect on malignant cells or activation of the adaptive immune system. In addition, novel immunotherapeutic approaches tend to take advantage of NK cells' ability, leading to antibody-based approaches, the formation of engineered CAR-NK cells, and adoptive cell transfer. However, the restricted functionality of NK cells and the inability to infiltrate tumors are its blind spots in breast cancer patients. In this review, we gathered newly acquired data on the biology and functions of NK cells in breast cancer and proposed ways to employ this knowledge for novel therapeutic approaches in cancers, particularly breast cancer.
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Affiliation(s)
- Ehsan Razeghian
- Human Genetics Division, Medical Biotechnology Department, National Institute of Genetics Engineering and Biotechnology (NIGEB), Tehran, Iran
| | - Mahdis Chahar Kameh
- Department of Microbiology, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Sepehr Shafiee
- Department of Pharmacology, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Farima Khalafi
- Department of Pharmacology, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Fehimeh Jafari
- Department of Radiation Oncology, Iran University of Medical Sciences, Tehran, Iran
- Radiation Oncology Research Center, Iran University of Medical Sciences, Tehran, Iran
| | - Mohammadali Asghari
- Department of Pharmacology, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Kiarash Kazemi
- Rheumatology Research Center, Tehran University of Medical Sciences, Tehran, Iran
| | - Saba Ilkhani
- Department of Biology and Anatomical Sciences, School of Medicine, Shahid Beheshti University, Tehran, Iran
| | - Siavash Shariatzadeh
- Department of Pharmacology, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
| | - Arvin Haj-Mirzaian
- Department of Pharmacology, Tehran University of Medical Sciences, Tehran, Iran
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Mosafer AA, Toosi MR, Asghari M. Effect study of hexagonal mesoporous silica/polyaniline nanocomposite on the structural properties of polysulfone membranes and its heavy metal removal efficiency. SEP SCI TECHNOL 2017. [DOI: 10.1080/01496395.2017.1297455] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- A. A. Mosafer
- Department of Chemistry, Qaemshahr Branch, Islamic Azad University, Qaemshahr, Iran
| | - M. R. Toosi
- Department of Chemistry, Qaemshahr Branch, Islamic Azad University, Qaemshahr, Iran
| | - M. Asghari
- Separation Processes Research Group (SPRG), Department of Engineering, University of Kashan, Kashan, Iran
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Rafieepour A, Ghamari F, Mohammadbeigi A, Asghari M. Seasonal variation in exposure level of types a and B ultraviolet radiation: an environmental skin carcinogen. Ann Med Health Sci Res 2015; 5:129-33. [PMID: 25861533 PMCID: PMC4389328 DOI: 10.4103/2141-9248.153623] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [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: 12/03/2022] Open
Abstract
Background: The main source of ultraviolet radiation (UVR) is the sun, affecting organs such as the skin, eyes, and immune system. According to American Conference of Governmental Industrial Hygienist (ACGIH) reports, the amount of UVR reaching the Earth's surface is increasing yearly and is responsible for an increase in solar radiation-related diseases. Aims: To investigate the amount of UVR reaching the Earth's surface and understand the risk of UVR on disease among outdoor laborers in one of the central provinces of Iran. Materials and Methods: Arak city was divided into two geographic areas, and the weekly measurement of UVR was done in three locations) asphalt, grass and rooftop). To measure UVR, Hanger UV spectrometer, standard deviation (SD8-A), and SD8-B detectors were used. Amounts of UVR for a consecutive year and varying weather conditions were measured. Finally, values obtained were compared to ACGIH standards. Results: The minimum and maximum levels of UV type A radiation occurred in April 1.27 (0.724) W/m2 and September 7.147 (4.128) W/m2, these figures for UV type B were in March–April 0.005 (0.003) and September 0.083 (0.077). The maximum UVR is received between 11 and 15 o’clock. Conclusions: In the central cities of Iran, the minimum and maximum UV type A and B is received in March–April and in September, respectively. Based on the results, the angular position of the sun in the sky, cloud cover, and height from ground level affected the amount of UVR received, but the geographic locations studied did not.
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Affiliation(s)
- A Rafieepour
- Department of Occupational Health, Arak University of Medical Sciences, Arak, Iran
| | - F Ghamari
- Department of Occupational Health, Hamadan University of Medical Sciences, Hamadan, Iran
| | - A Mohammadbeigi
- Department of Epidemiology and Biostatistics, Faculty of Health, Research Center for Environmental Air Pollutants, Qom University of Medical Sciences, Qom, Iran
| | - M Asghari
- Department of Occupational Health Tehran University of Medical Science, University of Tehran, Tehran, Iran
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Krishnamoorthy AV, Zheng X, Feng D, Lexau J, Buckwalter JF, Thacker HD, Liu F, Luo Y, Chang E, Amberg P, Shubin I, Djordjevic SS, Lee JH, Lin S, Liang H, Abed A, Shafiiha R, Raj K, Ho R, Asghari M, Cunningham JE. A low-power, high-speed, 9-channel germanium-silicon electro-absorption modulator array integrated with digital CMOS driver and wavelength multiplexer. Opt Express 2014; 22:12289-12295. [PMID: 24921347 DOI: 10.1364/oe.22.012289] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
We demonstrate the first germanium-silicon C-band electro-absorption based waveguide modulator array and echelle-grating-based silicon wavelength multiplexer integrated with a digital CMOS driver circuit. A 9-channel, 10Gbps SiGe electro-absorption wavelength-multiplexed modulator array consumed a power of 5.8mW per channel while being modulated at 10.25Gbps by 40nm CMOS drivers delivering peak-to-peak voltage swings of 2V, achieving a modulation energy-efficiency of ~570fJ/bit including drivers. Performance up to 25Gbps on a single-channel SiGe modulator and CMOS driver is also reported.
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Asghari M, Abdollahi R. Changes in quality of strawberries during cold storage in response to postharvest nitric oxide and putrescine treatments. Acta Alimentaria 2013. [DOI: 10.1556/aalim.42.2013.4.8] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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Moghadam MN, Aminian K, Asghari M, Parnianpour M. How well do the muscular synergies extracted via non-negative matrix factorisation explain the variation of torque at shoulder joint? Comput Methods Biomech Biomed Engin 2013; 16:291-301. [DOI: 10.1080/10255842.2011.617705] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Zilkie AJ, Seddighian P, Bijlani BJ, Qian W, Lee DC, Fathololoumi S, Fong J, Shafiiha R, Feng D, Luff BJ, Zheng X, Cunningham JE, Krishnamoorthy AV, Asghari M. Power-efficient III-V/silicon external cavity DBR lasers. Opt Express 2012; 20:23456-23462. [PMID: 23188309 DOI: 10.1364/oe.20.023456] [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: 05/26/2023]
Abstract
We report the design and characterization of external-cavity DBR lasers built with a III-V-semiconductor reflective-SOA with spot-size converter edge-coupled to SOI waveguides containing Bragg grating mirrors. The un-cooled lasers have wall-plug-efficiencies of up to 9.5% at powers of 6 mW. The lasers are suitable for making power efficient, hybrid WDM transmitters in a CMOS-compatible SOI optical platform.
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Affiliation(s)
- A J Zilkie
- Kotura Inc., 2630 Corporate Place, Monterey Park, California 91754, USA.
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Namazi N, Esfanjani AT, Asghari M, Bahrami A. The Effect of Hydroalcholic Nettle (Urtica dioica) Extracts on Some Cardiovascular Risk Factors in Patients With Type 2 Diabetes. J of Medical Sciences 2011. [DOI: 10.3923/jms.2011.138.144] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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Sadeghnia H, Mousavi S, Tayarani-Najaran Z, Asghari M. Protective effect of nigella sativa extract and thymoquinone on serum/glucose deprivation-induced PC12 cells death. Eur Psychiatry 2011. [DOI: 10.1016/s0924-9338(11)72613-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
Abstract
The serum/glucose deprivation (SGD)-induced cell death in cultured PC12 cells represents a useful in vitro model for the study of brain ischemia and neurodegenerative disorders.Nigella sativa L. and its active component, thymoquinone (TQ) have been known as a source of antioxidants. In the present study, the protective effects of N. sativa and TQ on cell viability and reactive oxygen species (ROS) production in cultured PC12 cells were investigated under SGD conditions. PC12 Cells were pretreated with different concentrations of N. sativa extract (15.62–250 μg/ml) and TQ (1.17–150 μM) for 2 h and then subjected to SGD for 6 or 18 h. Cell viability was quantitated by MTT assay. Intracellular ROS production was measured by flow cytometry using 2’,7’-dichlorofluorescin diacetate (DCF-DA) as a probe. SGD induced significant cells toxicity after 6, 18, or 24 h (p < 0.001). Pretreatment with N. sativa (15.62–250 μg/ml) and TQ (1.17–37.5 μM) reduced SGD-induced cytotoxicity in PC12 cells after 6 and 18 h. A significant increase in intracellular ROS production was seen following SGD (p < 0.001). N. sativa (250 μg/ml, p < 0.01) and TQ (2.34, 4.68, 9.37 μM, p < 0.01) pretreatment reversed the increased ROS production following ischemic insult. The experimental results suggest that N. sativa extract and TQ protects the PC12 cells against SGD-induced cytotoxicity via antioxidant mechanisms. Our findings might raise the possibility of potential therapeutic application of N. sativa extract and TQ for managing cerebral ischemic and neurodegenerative disorders.
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Saremi A, Asghari M, Ghorbani A. Effects of aerobic training on serum omentin-1 and cardiometabolic risk factors in overweight and obese men. J Sports Sci 2010; 28:993-8. [DOI: 10.1080/02640414.2010.484070] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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Mousavi SH, Tayarani-Najaran Z, Asghari M, Sadeghnia HR. Protective effect of Nigella sativa extract and thymoquinone on serum/glucose deprivation-induced PC12 cells death. Cell Mol Neurobiol 2010; 30:591-8. [PMID: 20054635 DOI: 10.1007/s10571-009-9484-1] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2009] [Accepted: 12/04/2009] [Indexed: 11/28/2022]
Abstract
The serum/glucose deprivation (SGD)-induced cell death in cultured PC12 cells represents a useful in vitro model for the study of brain ischemia and neurodegenerative disorders. Nigella sativa L. (family Ranunculaceae) and its active component thymoquinone (TQ) has been known as a source of antioxidants. In the present study, the protective effects of N. sativa and TQ on cell viability and reactive oxygen species (ROS) production in cultured PC12 cells were investigated under SGD conditions. PC12 cells were cultured in DMEM medium containing 10% (v/v) fetal bovine serum, 100 units/ml penicillin, and 100 microg/ml streptomycin. Cells were seeded overnight and then deprived of serum/glucose for 6 and 18 h. Cells were pretreated with different concentrations of N. sativa extract (15.62-250 microg/ml) and TQ (1.17-150 microM) for 2 h. Cell viability was quantitated by MTT assay. Intracellular ROS production was measured by flow cytometry using 2',7'-dichlorofluorescin diacetate (DCF-DA) as a probe. SGD induced significant cells toxicity after 6, 18, or 24 h (P < 0.001). Pretreatment with N. sativa (15.62-250 microg/ml) and TQ (1.17-37.5 microM) reduced SGD-induced cytotoxicity in PC12 cells after 6 and 18 h. A significant increase in intracellular ROS production was seen following SGD (P < 0.001). N. sativa (250 microg/ml, P < 0.01) and TQ (2.34, 4.68, 9.37 microM, P < 0.01) pretreatment reversed the increased ROS production following ischemic insult. The experimental results suggest that N. sativa extract and TQ protects the PC12 cells against SGD-induced cytotoxicity via antioxidant mechanisms. Our findings might raise the possibility of potential therapeutic application of N. sativa extract and TQ for managing cerebral ischemic and neurodegenerative disorders.
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Affiliation(s)
- S H Mousavi
- Department of Pharmacology and Pharmacological Research Centre of Medicinal Plants, School of Medicine, Mashhad University of Medical Sciences (MUMS), Mashhad, Iran
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Abstract
A forward-biased p-i-n diode integrated with a ridge waveguide forms a basic Si attenuator building block. Disruptive power improvement was achieved through a recessed contact configuration by limiting the amount of Si volume for carrier recombination. A device model was established by using realistic surface recombination velocities instead of effective carrier lifetime concept to understand the device physics of the afore-mentioned Si attenuator.
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Affiliation(s)
- D W Zheng
- Kotura, inc, 2630 corporate place, Monterey Park, CA 91754, USA.
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