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Salmani F, Mohammadi M, Seif R, Khatami SH, Noori S, Tehrani HS, Riazi G, Balalaie S, Moosavi-Movahedi AA, Fard AM, Mahnam K, Keramatinia A, Tafakhori A, Aghamollaii V, Toutounchi AH, Shahmohammadi MR, Karima S. Lysine ε-aminolysis and incorporation of sulfhydryl groups into human brain tau 4R/1N and 306VQIVYK 311 enhances the formation of beta structures and toxicity. Int J Biol Macromol 2024; 263:130223. [PMID: 38365146 DOI: 10.1016/j.ijbiomac.2024.130223] [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] [Received: 07/25/2023] [Revised: 02/13/2024] [Accepted: 02/13/2024] [Indexed: 02/18/2024]
Abstract
In the present study, we investigated the effects of N-homocysteine thiolactone (tHcy) modification on expressed and purified tau protein and the synthesized VQIVYK target peptide. The modified constructs were subjected to comprehensive validation using various methodologies, including mass spectrometry. Subsequently, in vivo, in vitro, and in silico characterizations were performed under both reducing and non-reducing conditions, as well as in the presence and absence of heparin as a cofactor. Our results unequivocally confirmed that under reducing conditions and in the presence of heparin, the modified constructs exhibited a greater propensity for aggregation. This enhanced aggregative behavior can be attributed to the disruption of lysine positive charges and the subsequent influence of hydrophobic and p-stacking intermolecular forces. Notably, the modified oligomeric species induced apoptosis in the SH-SY5Y cell line, and this effect was further exacerbated with longer incubation times and higher concentrations of the modifier. These observations suggest a potential mechanism involving reactive oxygen species (ROS). To gain a deeper understanding of the molecular mechanisms underlying the neurotoxic effects, further investigations are warranted. Elucidating these mechanisms will contribute to the development of more effective strategies to counteract aggregation and mitigate neurodegeneration.
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Affiliation(s)
- Farzaneh Salmani
- Department of Clinical Biochemistry, School of Medicine, Shahid Beheshti University of Medical Sciences (SBMU), Tehran, Iran
| | - Marjan Mohammadi
- Student Research Committee, Faculty of Pharmacy, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Roozbeh Seif
- Student Research Committee, Faculty of Pharmacy, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Seyyed Hossein Khatami
- Department of Clinical Biochemistry, School of Medicine, Shahid Beheshti University of Medical Sciences (SBMU), Tehran, Iran
| | - Shokoofeh Noori
- Department of Clinical Biochemistry, School of Medicine, Shahid Beheshti University of Medical Sciences (SBMU), Tehran, Iran
| | | | - Gholamhossein Riazi
- Institute of Biochemistry and Biophysics (IBB), University of Tehran, Tehran, Iran
| | - Saeed Balalaie
- Peptide Chemistry Research Center, K. N. Toosi University of Technology, Tehran, Iran
| | | | | | - Karim Mahnam
- Faculty of Science, Department of Biology, Nanotechnology Research Center, Sharekord University, Sharekord, Iran
| | - Aliasghar Keramatinia
- Department of Community Medicine,Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Abbas Tafakhori
- Department of Neurology, School of Medicine, Iranian Center of Neurological Research, Tehran University of Medical Sciences (TUMS), Tehran, Iran
| | - Vajiheh Aghamollaii
- Neurology Department, Roozbeh Hospital, Tehran University of Medical Sciences (TUMS), Tehran, Iran
| | - Alireza Haghbin Toutounchi
- Department of general surgery, Imam Hosein medical and educational center, Shahid Beheshti University of Medical Sciences,Tehran,Iran
| | - Mohammad Reza Shahmohammadi
- Functional Neurosurgery Research Center, Shohada Tajrish Comprehensive Neurosurgical Center of Excellence, Shahid Beheshti University of Medical Sciences (SBMU), Tehran, Iran
| | - Saeed Karima
- Department of Clinical Biochemistry, School of Medicine, Shahid Beheshti University of Medical Sciences (SBMU), Tehran, Iran.
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Kachouei RA, Doagoo A, Jalilzadeh M, Khatami SH, Rajaei S, Jahan-Abad AJ, Salmani F, Pakrad R, Baram SM, Nourbakhsh M, Abdollahifar MA, Abbaszadeh HA, Noori S, Rezaei M, Mahdavi M, Shahmohammadi MR, Karima S. Acetyl-11-Keto-Beta-Boswellic Acid Has Therapeutic Benefits for NAFLD Rat Models That Were Given a High Fructose Diet by Ameliorating Hepatic Inflammation and Lipid Metabolism. Inflammation 2023; 46:1966-1980. [PMID: 37310644 DOI: 10.1007/s10753-023-01853-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2023] [Revised: 05/31/2023] [Accepted: 06/05/2023] [Indexed: 06/14/2023]
Abstract
Acetyl-11-keto-beta-boswellic acid (AKBA), a potent anti-inflammatory compound purified from Boswellia species, was investigated in a preclinical study for its potential in preventing and treating non-alcoholic fatty liver disease (NAFLD), the most common chronic inflammatory liver disorder. The study involved thirty-six male Wistar rats, equally divided into prevention and treatment groups. In the prevention group, rats were given a high fructose diet (HFrD) and treated with AKBA for 6 weeks, while in the treatment group, rats were fed HFrD for 6 weeks and then given a normal diet with AKBA for 2 weeks. At the end of the study, various parameters were analyzed including liver tissues and serum levels of insulin, leptin, adiponectin, monocyte chemoattractant protein-1 (MCP-1), transforming growth factor beta (TGF-β), interferon gamma (INF-ϒ), interleukin-6 (IL-6), and tumor necrosis factor alpha (TNF-α). Additionally, the expression levels of genes related to the inflammasome complex and peroxisome proliferator-activated receptor gamma (PPAR-ϒ), as well as the levels of phosphorylated and non-phosphorylated AMP-activated protein kinase alpha-1 (AMPK-α1) protein, were measured. The results showed that AKBA improved NAFLD-related serum parameters and inflammatory markers and suppressed PPAR-ϒ and inflammasome complex-related genes involved in hepatic steatosis in both groups. Additionally, AKBA prevented the reduction of the active and inactive forms of AMPK-α1 in the prevention group, which is a cellular energy regulator that helps suppress NAFLD progression. In conclusion, AKBA has a beneficial effect on preventing and avoiding the progression of NAFLD by preserving lipid metabolism, improving hepatic steatosis, and suppressing liver inflammation.
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Affiliation(s)
- Reza Ataei Kachouei
- Department of Clinical Biochemistry, School of Medicine, Shahid Beheshti University of Medical Sciences (SBMU), Tehran, Iran
| | - Alireza Doagoo
- Department of Clinical Biochemistry, School of Medicine, Shahid Beheshti University of Medical Sciences (SBMU), Tehran, Iran
| | - Maral Jalilzadeh
- Science and Research Branch, Islamic Azad University, Tehran, Iran
| | - Seyyed Hossein Khatami
- Department of Clinical Biochemistry, School of Medicine, Shahid Beheshti University of Medical Sciences (SBMU), Tehran, Iran
| | - Shima Rajaei
- Department of Clinical Biochemistry, School of Medicine, Shahid Beheshti University of Medical Sciences (SBMU), Tehran, Iran
| | - Ali Jahanbazi Jahan-Abad
- Department of Clinical Biochemistry, School of Medicine, Shahid Beheshti University of Medical Sciences (SBMU), Tehran, Iran
- Department of Anatomy, Physiology and Pharmacology, University of Saskatchewan, Saskatoon, SK, Canada
| | - Farzaneh Salmani
- Department of Clinical Biochemistry, School of Medicine, Shahid Beheshti University of Medical Sciences (SBMU), Tehran, Iran
| | - Roya Pakrad
- Department of Clinical Biochemistry, School of Medicine, Shahid Beheshti University of Medical Sciences (SBMU), Tehran, Iran
| | | | - Mitra Nourbakhsh
- Department of Clinical Biochemistry, School of Medicine, Iran University of Medical Sciences (IUMS), Tehran, Iran
| | - Mohammad-Amin Abdollahifar
- Department of Biology and Anatomy, School of Medicine, Shahid Beheshti University of Medical Sciences (SBMU), Tehran, Iran
| | - Hojjat Allah Abbaszadeh
- Laser Application in Medical Sciences Research Center, Shahid Beheshti University of Medical Sciences (SBMU), Tehran, Iran
| | - Shokoofeh Noori
- Department of Clinical Biochemistry, School of Medicine, Shahid Beheshti University of Medical Sciences (SBMU), Tehran, Iran
| | - Mitra Rezaei
- Department of Pathology, School of Medicine, Shahid Beheshti University of Medical Sciences (SBMU), Tehran, Iran
| | - Meisam Mahdavi
- Department of Clinical Biochemistry, School of Medicine, Shahid Beheshti University of Medical Sciences (SBMU), Tehran, Iran
| | - Mohammad Reza Shahmohammadi
- Functional Neurosurgery Research Center, Shohada Tajrish Comprehensive Neurosurgical Center of Excellence, Shahid Beheshti University of Medical Sciences (SBMU), Tehran, Iran
| | - Saeed Karima
- Department of Clinical Biochemistry, School of Medicine, Shahid Beheshti University of Medical Sciences (SBMU), Tehran, Iran.
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Elsayed M, Eladil O, Elsadig S, Noori S. Cases of neuroferritinopathy from Sudan. J Neurol Sci 2019. [DOI: 10.1016/j.jns.2019.10.1595] [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: 10/25/2022]
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Affiliation(s)
- S. Noori
- Polymer Engineering Department, Faculty of Chemical Engineering; Tarbiat Modares University; P.O. Box 14115-114, Tehran Islamic Republic of Iran
| | - M. Kokabi
- Polymer Engineering Department, Faculty of Chemical Engineering; Tarbiat Modares University; P.O. Box 14115-114, Tehran Islamic Republic of Iran
| | - Z. M. Hassan
- Immunology Department, Faculty of Medical Sciences; Tarbiat Modares University; P.O. Box: 14115-331, Tehran Islamic Republic of Iran
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Nguyen J, Amirnovin R, Ramanathan R, Noori S. The state of point-of-care ultrasonography use and training in neonatal-perinatal medicine and pediatric critical care medicine fellowship programs. J Perinatol 2016; 36:972-976. [PMID: 27513327 DOI: 10.1038/jp.2016.126] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.8] [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: 04/26/2016] [Revised: 07/01/2016] [Accepted: 07/06/2016] [Indexed: 11/09/2022]
Abstract
OBJECTIVE The current state of point-of-care ultrasonography (POCUS) use and education in neonatal-perinatal medicine (NPM) and pediatric critical care medicine (PCCM) is unknown. Our aim was to quantify POCUS use, training and perceptions regarding education and barriers among the United States NPM and PCCM fellowship programs. STUDY DESIGN A 14-question survey was emailed to the fellowship directors of all the United States NPM and PCCM fellowship programs. RESULTS The response rate was 55% (52/95) and 59% (39/66) for NPM and PCCM programs, respectively. Over 90% of respondents in both groups believe that fellows and attendings should receive POCUS training. PCCM programs, compared with NPM, had greater access to POCUS machines (97% vs 63%, P<0.001), and more often used POCUS for diagnoses and management (76% vs 29%, P<0.001) and procedural guidance (95% vs 37%, P<0.001). The most common indications were cardiac/hemodynamics, pulmonary pathology and vascular access in both specialties. PCCM reported more training to fellows (90% vs 29%, P<0.001). Both group perceived lack of time to learn, lack of equipment/funds, liability concerns, lack of personnel to train physicians and cardiology/radiology resistance as significant barriers to POCUS implementation. CONCLUSIONS Both NPM and PCCM fellowship programs believe in the benefits of POCUS and that their physicians should receive the necessary training. Compared with PCCM, NPM fellowships programs have less access to POCUS machines and less frequently use POCUS and train their fellows and attendings. There remain significant barriers to utilization of POCUS, especially in NPM.
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Affiliation(s)
- J Nguyen
- Division of Neonatal-Perinatal Medicine, Department of Pediatrics, Children's Hospital Los Angeles, Keck School of Medicine, University of Southern California, Los Angeles, CA, USA.,Center for Fetal and Neonatal Medicine, Department of Pediatrics, Children's Hospital Los Angeles, Keck School of Medicine, University of Southern California, Los Angeles, CA, USA.,LAC+USC Medical Center, Keck School of Medicine, University of Southern California, Los Angeles, CA, USA
| | - R Amirnovin
- Anesthesiology Critical Care Medicine, Children's Hospital Los Angeles, Keck School of Medicine, University of Southern California, Los Angeles, CA, USA
| | - R Ramanathan
- Division of Neonatal-Perinatal Medicine, Department of Pediatrics, Children's Hospital Los Angeles, Keck School of Medicine, University of Southern California, Los Angeles, CA, USA.,Center for Fetal and Neonatal Medicine, Department of Pediatrics, Children's Hospital Los Angeles, Keck School of Medicine, University of Southern California, Los Angeles, CA, USA.,LAC+USC Medical Center, Keck School of Medicine, University of Southern California, Los Angeles, CA, USA
| | - S Noori
- Division of Neonatal-Perinatal Medicine, Department of Pediatrics, Children's Hospital Los Angeles, Keck School of Medicine, University of Southern California, Los Angeles, CA, USA.,Center for Fetal and Neonatal Medicine, Department of Pediatrics, Children's Hospital Los Angeles, Keck School of Medicine, University of Southern California, Los Angeles, CA, USA.,LAC+USC Medical Center, Keck School of Medicine, University of Southern California, Los Angeles, CA, USA
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Ma M, Noori S, Maarek JM, Holschneider DP, Rubinstein EH, Seri I. Prone positioning decreases cardiac output and increases systemic vascular resistance in neonates. J Perinatol 2015; 35:424-7. [PMID: 25590219 DOI: 10.1038/jp.2014.230] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [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: 08/28/2014] [Revised: 11/09/2014] [Accepted: 11/20/2014] [Indexed: 11/09/2022]
Abstract
OBJECTIVE To evaluate the cardiovascular response to short-term prone positioning in neonates. STUDY DESIGN In this prospective study, we continuously monitored heart rate (HR), stroke volume (SV) and cardiac output (CO) by electrical velocimetry in hemodynamically stable neonates in each of the following positions for 10 min: supine, prone and back-to-supine position. Skin blood flow (SBF) was also continuously assessed on the forehead or foot using Laser Doppler technology. Systemic vascular resistance (SVR) index was calculated as mean blood pressure (BP)/CO. Data were analyzed using repeated measures analysis of variance. RESULTS Thirty neonates (gestational age: 35±4 weeks; postmenstrual age: 36±3 weeks) were enrolled. HR did not change in response to positioning. However, in prone position, SV, CO and SBF decreased and SVR index increased from 1.5±0.3 to 1.3±0.3 ml kg(-1) (mean ±s.d., P<0.01), 206±44 to 180±41 ml kg(-1) min(-1) (P<0.01), 0.54±0.30 to 0.44±0.29 perfusion units (P<0.01) and 0.25±0.06 to 0.30±0.07 mm Hg ml(-1) kg(-1) min(-1) (P<0.01), respectively. After placing the infants back-to-supine position, SV, CO, SBF and SVR index returned to baseline. The above pattern of cardiovascular changes was consistent in vast majority of the studied neonates. CONCLUSIONS Short-term prone positioning is associated with decreased SV, CO and SBF and increased calculated SVR index.
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Affiliation(s)
- M Ma
- 1] Division of Neonatology and the Center for Fetal and Neonatal Medicine, Department of Pediatrics, Children's Hospital Los Angeles, Los Angeles, CA, USA [2] The LAC+USC Medical Center, Los Angeles, CA, USA [3] Keck School of Medicine, University of Southern California, Los Angeles, CA, USA
| | - S Noori
- 1] Division of Neonatology and the Center for Fetal and Neonatal Medicine, Department of Pediatrics, Children's Hospital Los Angeles, Los Angeles, CA, USA [2] The LAC+USC Medical Center, Los Angeles, CA, USA [3] Keck School of Medicine, University of Southern California, Los Angeles, CA, USA
| | - J-M Maarek
- Department of Biomedical Engineering, University of Southern California, Los Angeles, CA,USA
| | - D P Holschneider
- 1] Department of Biomedical Engineering, University of Southern California, Los Angeles, CA,USA [2] Department of Psychiatry and Behavioral Science, University of Southern California, Los Angeles, CA, USA
| | - E H Rubinstein
- Department of Anesthesiology, University of California Los Angeles, Los Angeles, CA,USA
| | - I Seri
- 1] Division of Neonatology and the Center for Fetal and Neonatal Medicine, Department of Pediatrics, Children's Hospital Los Angeles, Los Angeles, CA, USA [2] The LAC+USC Medical Center, Los Angeles, CA, USA [3] Keck School of Medicine, University of Southern California, Los Angeles, CA, USA [4] Sidra Neonatology Center of Excellence, Department of Pediatrics, Sidra Medical and Research Center, Doha, Qatar
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Noori S, Kokabi M, Hassan Z. Nanoclay Enhanced the Mechanical Properties of Poly(Vinyl Alcohol) /Chitosan /Montmorillonite Nanocomposite Hydrogel as Wound Dressing. ACTA ACUST UNITED AC 2015. [DOI: 10.1016/j.mspro.2015.11.023] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.0] [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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Noori S, Seri I. Does targeted neonatal echocardiography affect hemodynamics and cerebral oxygenation in extremely preterm infants? J Perinatol 2014; 34:847-9. [PMID: 25033075 DOI: 10.1038/jp.2014.127] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [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: 01/03/2014] [Revised: 04/03/2014] [Accepted: 05/05/2014] [Indexed: 11/09/2022]
Abstract
OBJECTIVE To investigate the effect of targeted neonatal echocardiography (TnEcho) on heart rate, arterial oxygen saturation (SPO2), cerebral regional oxygen saturation (CrSO2) and cerebral fractional oxygen extraction (CFOE) in extremely preterm infants during the first 3 postnatal days. STUDY DESIGN s a nested study in a prospective observational study, we acquired continuous data on heart rate, SPO2, CrSO2 and CFOE. Data averaged for the duration of TnEcho study were compared with the data collected during a baseline period immediately before the start of echocardiography. The duration of the baseline and study periods was the same. TnEcho evaluation included assessment of preload, afterload, contractility, left and right ventricular output, patent ductus arteriosus and foramen ovale. RESULT We analyzed 138 data pairs before and during TnEcho in 22 extremely preterm infants (gestational age 25.9 ± 1.2 weeks; range 23 to 27). There was no significant difference in heart rate between baseline and TnEcho period. There was a statistical, but clinically negligible, difference between baseline and TnEcho in SPO2 (median (quartile) 91.4% (88.9, 94.2) vs 91.3% (88.9, 94), P = 0.048), CrSO2 (76.8% (70.7, 81.5) vs 74.9% (69.5, 80.1), P<0.0001) and CFOE (15.8% (9.8, 23.6) vs 17.5% (11.3, 24.7), P<0.0001). The changes in the parameters monitored were similar in preterm infants who developed peri/intraventricular hemorrhage and in those who did not. CONCLUSION Although there were statistically significant changes in SPO2, CrSO2 and CFOE, the alterations were minimal and unlikely of clinical relevance. Thus, cerebral hemodynamics and systemic and cerebral oxygenation are not perturbed during TnEcho and the procedure is well tolerated by the extremely preterm infants during the postnatal transitional period.
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Affiliation(s)
- S Noori
- Division of Neonatology and the Center for Fetal and Neonatal Medicine, Department of Pediatrics, Children's Hospital Los Angeles and the LAC+USC Medical Center, Keck School of Medicine, University of Southern California, Los Angeles, CA, USA
| | - I Seri
- Sidra Neonatology Center of Excellence, Department of Pediatrics, Sidra Medical and Research Center, Doha, Qatar
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N. Pesyan N, Noori S, Poorhassan S, Şahin E. New spiro (thio) barbiturates based on cyclohexanone and bicyclo [3.1.1]heptan-6-one by nonconcerted [1+5] cycloaddition reaction and their conformational structures. B CHEM SOC ETHIOPIA 2014. [DOI: 10.4314/bcse.v28i3.12] [Citation(s) in RCA: 6] [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: 11/17/2022] Open
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Dannaway DC, Noori S. A randomized trial of platelet transfusions over 30 vs 120 minutes: is there an effect on post-transfusion platelet counts? J Perinatol 2013; 33:703-6. [PMID: 23636098 DOI: 10.1038/jp.2013.46] [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] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/20/2012] [Revised: 02/26/2013] [Accepted: 03/20/2013] [Indexed: 10/26/2022]
Abstract
OBJECTIVE To determine whether platelet infusion time affects platelet counts in thrombocytopenic newborns. STUDY DESIGN This was a prospective randomized control study of 43 platelet transfusions given to newborns. Transfusions were randomized to run over either 30 min or 2 h. Platelet counts taken 30 min and 6 h after transfusion were compared using parametric, nonparametric, Pearson's correlation and logistic regression. RESULT Changes in platelet counts 30 min and 6 h after transfusion were not different between the groups. Weak but significant negative correlations existed between postmenstrual age and change in platelet count at 30 min (r=-0.33, P=0.04) and 6 h (r=-0.37, P=0.018) after transfusion. There were no differences between the mean blood pressures before and after transfusion in either group. CONCLUSION Transfusion duration does not affect post-transfusion platelet counts in newborns. Babies of lower postmenstrual age (PMA) may have better responses to platelet transfusions. Finally, platelet transfusions over both durations are well tolerated in neonates.
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Affiliation(s)
- D C Dannaway
- Section on Neonatal-Perinatal Medicine, Department of Pediatrics, University of Oklahoma Health Sciences Center, Oklahoma City, OK, USA.
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Arcinue R, Stavroudis T, Noori S, Bhombal S, Szmuszkovicz J, Friedlich P. Early Echocardiographic Predictors of Alveolar Capillary Dysplasia: A Case-Control Study. J Heart Lung Transplant 2013. [DOI: 10.1016/j.healun.2013.01.771] [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] Open
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Noori S, Drabu B, McCoy M, Sekar K. Non-invasive measurement of local tissue perfusion and its correlation with hemodynamic indices during the early postnatal period in term neonates. J Perinatol 2011; 31:785-8. [PMID: 21527904 DOI: 10.1038/jp.2011.34] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
OBJECTIVE Monitoring the changes in buccal tissue oxygen saturation (StO(2)) may aid in early diagnosis of circulatory compromise. Our objective was to define the normal value of buccal StO(2) and its correlation to the middle cerebral artery (MCA) flow indices and cardiac output in healthy term infants during the first 48 h after birth. STUDY DESIGN In this prospective study, we assessed buccal StO(2) by visible light spectroscopy and assessed the left ventricular output (LVO) and MCA flow indices by ultrasound on postnatal days 1 and 2. We enrolled 20 term neonates. The Wilcoxon-matched pairs signed-rank test and Pearson correlation were used to analyze the data. RESULT Median (range) buccal StO(2) readings were 68% (62 to 72) on day 1 and 66% (61 to 69) on day 2 (P=0.03). A weak but significant positive correlation was found between buccal StO(2) and LVO (r=0.37, P=0.023). There was no correlation between buccal StO(2) and MCA mean velocity or pulsatility index. CONCLUSION Under a physiological state, buccal StO(2) in resting healthy neonates is 61 to 72%, regardless of variability in systemic and cerebral blood flow. Because of its ease of use and non-invasive nature, the use of visible light spectroscopy in conditions with circulatory compromise needs to be further investigated.
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Affiliation(s)
- S Noori
- Section of Neonatal-Perinatal Medicine, Department of Pediatrics, The Children's Hospital, University of Oklahoma Health Sciences Center, Oklahoma City, OK, USA.
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Abstract
Pharmacological and/or surgical closure of a hemodynamically significant patent ductus arteriosus (PDA) in the very preterm infant has been the standard of care over the past few decades. However, the rationale for closure of PDA has recently been challenged. In this article, the factors that have fueled the controversy of the approach to the management of PDA and the gap in our knowledge are reviewed in detail. In addition, the pros and cons of the different treatment strategies applied in clinical care are evaluated with a focus on discussing the available evidence in the literature.
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Affiliation(s)
- S Noori
- Department of Pediatrics, Neonatal-Perinatal Medicine, University of Oklahoma Health Sciences Center, Oklahoma City, OK 73104, USA.
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Noori S, Patel D, Friedlich P, Siassi B, Seri I, Ramanathan R. Effects of low oxygen saturation limits on the ductus arteriosus in extremely low birth weight infants. J Perinatol 2009; 29:553-7. [PMID: 19461594 DOI: 10.1038/jp.2009.60] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.0] [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] [Indexed: 11/09/2022]
Abstract
OBJECTIVE Postnatal increase in oxygen promotes constriction of the patent ductus arteriosus (PDA). According to the findings of prospective observational studies, the clinical practice of targeting lower fractional oxygen saturation between 70 and 90% has been associated with a reduced incidence of severe retinopathy of prematurity (ROP) without affecting survival or neurodevelopmental disability at 1 year of age. Our objective was to investigate the impact of the use of a lower oxygen saturation target range on the incidence of early hemodynamically significant PDA (hsPDA) and the need for ductal ligation in extremely low birth weight (ELBW, <1000 g) infants. STUDY DESIGN In this retrospective study, we analyzed data from 263 ELBW infants managed 4 years before (episode I: target oxygen saturation 89 to 94%) and after (episode II: target oxygen saturation 83 to 89%) implementation of the use of lower oxygen saturation limits in two neonatal intensive care units. Infants with a birth weight of 1000 to 1500 g were managed with the same oxygen saturation target range (89 to 94%) during both episodes, and they served as controls. Parametric and nonparametric tests were used as appropriate and multivariate logistic regression models were used to correct for confounders. RESULTS There was an increase in the incidence of hsPDA (63.2 vs 74.8%, P=0.043), without an increase in the need for surgical ligation (24.2 vs 29.9%, P=0.3) after implementation of the lower oxygen saturation target range policy. After adjusting for confounders, there was an increase in the odds of having an hsPDA (odds ratio (OR) 1.77, 95% confidence interval (CI) (1.03 to 3.06), P=0.04) but the odds for ductal ligation did not change in episode II (OR 1.25, 95% CI (0.70 to 2.25), P=0.4). The incidence of ROP > or = stage III (50.7 vs 15.7%; P<0.0001) and the need for laser ablation (33.8% vs 8.7%; P<0.0001) were significantly reduced. There was no change in the incidence of hsPDA or ductal ligation in the control group. CONCLUSION Targeting lower oxygen saturation limits to minimize periods of hyperoxemia in ELBW infants reduced the incidence of severe ROP and the need for laser ablation. The incidence of early hsPDA was increased; however, final closure rate and the incidence of surgical ligation of the ductus arteriosus were not affected.
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Affiliation(s)
- S Noori
- Department of Pediatrics, Neonatal-Perinatal Medicine, The Children's Hospital, University of Oklahoma Health Sciences Center, Oklahoma City, OK 73104, USA.
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Noori S, Hassan ZM, Rezaei B, Rustaiyan A, Habibi Z, Fallahian F. Artemisinin can inhibit the calmodulin-mediated activation of phosphodiesterase in comparison with Cyclosporin A. Int Immunopharmacol 2008; 8:1744-7. [PMID: 18793755 DOI: 10.1016/j.intimp.2008.08.012] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2008] [Revised: 08/11/2008] [Accepted: 08/14/2008] [Indexed: 10/21/2022]
Abstract
Artemisinin and Cyclosporin A were examined for their ability to inhibit the calmodulin-mediated activation of phosphodiesterase, which is based on the hydrolysis of cAMP to AMP by phosphodiesterase in the presence or absence of inhibitors, followed by quantitative analysis using spectrophotometer method. Anti-calmodulin activity of these agents was investigated by spectrofluorometry. Our results indicates that Artemisinin and Cyclosporin A induced some conformational changes on calmodulin and increased the fluorescence emission, but Artemisinin increased fluorescence emission of calmodulin in higher amounts compared with the Cyclosporin A. Kinetic analysis of the Artemisinin-calmodulin and Cyclosporine A-calmodulin interaction showed that these agents competitively inhibited the activation of phosphodiesterase without affecting Vmax. Artemisinin increased Km value in higher amounts compared with the Cyclosporin A. Ki values of Artemisinin and Cyclosporin A were determined as 10 microM and 35 microM, respectively. The DeltaG (H2O), the best parameter for the estimation of macromolecule stability, was determined for calmodulin in the absence and presence of Artemisinin and Cyclosporin A. However, the degree of decrease in DeltaG (H2O) value was as follows: Artemisinin>Cyclosporin A, which means Artemisinin induced more instability in the calmodulin structure.In conclusion, our findings showed a good correlation between the ability of both Artemisinin and Cyclosporin A to block the activation of phosphodiesterase and their ability to bind to the activator and that Artemisinin is a more potent inhibitor of phosphodiesterase compared with Cyclosporin A.
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Affiliation(s)
- S Noori
- Department of Biochemistry, School of Medical Sciences, Tarbiat Modares University, Tehran, Iran.
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Adie M, Noori S, Friedlich P, Payan A, Seri I. Predictors of Myocardial Function after Patent Ductus Arteriosus Ligation as Assessed by the Myocardial Performance Index. J Investig Med 2006. [DOI: 10.1177/108155890605401s165] [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: 01/09/2023]
Affiliation(s)
- M. Adie
- Children's Hospital Los Angeles, Keck School of Medicine, USC, Los Angeles, CA
| | - S. Noori
- Children's Hospital Los Angeles, Keck School of Medicine, USC, Los Angeles, CA
| | - P. Friedlich
- Children's Hospital Los Angeles, Keck School of Medicine, USC, Los Angeles, CA
| | - A. Payan
- Children's Hospital Los Angeles, Keck School of Medicine, USC, Los Angeles, CA
| | - I. Seri
- Children's Hospital Los Angeles, Keck School of Medicine, USC, Los Angeles, CA
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Adie M, Noori S, Friedlich P, Payan A, Seri I. 282 PREDICTORS OF MYOCARDIAL FUNCTION AFTER PATENT DUCTUS ARTERIOSUS LIGATION AS ASSESSED BY THE MYOCARDIAL PERFORMANCE INDEX. J Investig Med 2006. [DOI: 10.2310/6650.2005.x0004.281] [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: 11/18/2022]
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Noori S, Naderi GA, Hassan ZM, Habibi Z, Bathaie SZ, Hashemi SMM. Immunosuppressive activity of a molecule isolated from Artemisia annua on DTH responses compared with cyclosporin A. Int Immunopharmacol 2005; 4:1301-6. [PMID: 15313428 DOI: 10.1016/j.intimp.2004.05.003] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2003] [Revised: 04/27/2004] [Accepted: 05/03/2004] [Indexed: 11/22/2022]
Abstract
Artemisia belongs to the family of Compositea; there are different Artemisias in Iran, of which Artemisia annua L. is grown in the north of Iran. In this study, Artemisinin was extracted and purified from the whole plants. The purification of Artemisinin was performed using column chromatography in different polarities of solvents and the results were evaluated by Thin Layer Chromatography (TLC). (1)H-NMR (NMR-500) spectroscopy was used to characterize the purified Artemisinin. The immunosuppressive activity of Artemisinin was investigated on Balb/c mice by DTH response in comparison to cyclosporin A (CsA). The data indicated that Artemisinin could suppress the delayed type hypersensitivity (DTH) against sheep blood capsule in Balb/c mice. Also its inhibitory effect on calmodulin (CaM) structure was determined by fluorescence spectroscopy. The data indicated an inhibitory effect of that on the activity of calmodulin by increasing the fluorescence emission of calmodulin. Both in vivo (DTH response) and in vitro (spectrofluorometry) studies indicated the activity of Artemisinin as an immunosuppressive agent and that the fluorescence emission of calmodulin is more than cyclosporin A.
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Affiliation(s)
- Shokoofeh Noori
- Department of Clinical Biochemistry, School of Medical Sciences, Tarbiat Modarres University, Tehran, Iran
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Noori S, Friedlich P, Ebrahimi M, Wong P, Siassi B, Seri I. 256 HEMODYNAMIC CHANGES IN RESPONSE TO HYDROCORTISONE IN PRESSOR-TREATED NEONATES WITH COMPENSATED SHOCK. J Investig Med 2005. [DOI: 10.2310/6650.2005.00005.255] [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: 11/18/2022]
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Noori S, Friedlich P, Seri I. 258 CHANGES IN SYSTOLIC AND DIASTOLIC MYOCARDIAL FUNCTION FOLLOWING LIGATION OF DUCTUS ARTERIOSUS IN PRETERM INFANTS. J Investig Med 2005. [DOI: 10.2310/6650.2005.00005.257] [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: 11/18/2022]
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Sebald M, Friedlich P, Burns C, Stein J, Noori S, Ramanathan R, Seri I. 244 RISK OF NEED FOR EXTRACORPOREAL MEMBRANE OXYGENATION SUPPORT IN NEONATES WITH CONGENITAL DIAPHRAGMATIC HERNIA TREATED WITH INHALED NITRIC OXIDE. J Investig Med 2004. [DOI: 10.1136/jim-52-suppl1-244] [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: 11/04/2022]
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Friedlich P, Subramanian N, Sebald M, Noori S, Seri I. Use of high-frequency jet ventilation in neonates with hypoxemia refractory to high-frequency oscillatory ventilation. J Matern Fetal Neonatal Med 2003; 13:398-402. [PMID: 12962265 DOI: 10.1080/jmf.13.6.398.402] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
OBJECTIVE To describe the response to high-frequency jet ventilation in infants with hypoxemic respiratory failure unresponsive to high-frequency oscillatory ventilation. METHODS This was a retrospective analysis of chart records on demographics, ventilator settings, blood gas analysis and calculated oxygenation index prior to and during the first 7 days of high-frequency jet ventilation in ten consecutive infants. RESULTS Before the initiation of high-frequency jet ventilation, the ventilatory mean airway pressure (MAP; cmH2O), fraction of inspired oxygen (FiO2) and oxygenation index on high-frequency oscillatory ventilation were 14.3 +/- 1.3, 0.97 +/- 0.02 and 29 +/- 5, respectively. Three hours after the initiation of high-frequency jet ventilation, the oxygenation index improved to 18 +/- 4 (p < 0.001) and the improvement was sustained during the study period. By 6 h of high-frequency jet ventilation, the FiO2 decreased to 0.62 +/- 0.09 (p < 0.01) and, by 1-3 h of ventilation, the MAP decreased to 10.9 +/- 1.3 (p < 0.01). The improvement in FiO2 persisted for 7 days while, although the MAP remained lower throughout the study, the improvement in MAP failed to reach statistical significance after 72 h. No significant changes in pH, pCO2, or pO2 before or during high-frequency jet ventilation were noted. CONCLUSION High-frequency jet ventilation improves hypoxemic respiratory failure unresponsive to high-frequency oscillatory ventilation in infants. These findings suggest that not all high-frequency ventilatory devices yield the same clinical results.
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Affiliation(s)
- P Friedlich
- USC Division of Neonatal Medicine, Childrens Hospital Los Angeles and the Women's and Children's Hospital, LAC+USC Medical Center, Los Angeles, California 90027, USA
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Affiliation(s)
- K T Wong
- Department of Pathology, Faculty of Medicine, University of Malaya, Kuala Lumpur
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