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Isaac R, Bandyopadhyay G, Rohm TV, Kang S, Wang J, Pokhrel N, Sakane S, Zapata R, Libster AM, Vinik Y, Berhan A, Kisseleva T, Borok Z, Zick Y, Telese F, Webster NJG, Olefsky JM. TM7SF3 controls TEAD1 splicing to prevent MASH-induced liver fibrosis. Cell Metab 2024:S1550-4131(24)00123-2. [PMID: 38670107 DOI: 10.1016/j.cmet.2024.04.003] [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] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/16/2023] [Revised: 02/29/2024] [Accepted: 04/04/2024] [Indexed: 04/28/2024]
Abstract
The mechanisms of hepatic stellate cell (HSC) activation and the development of liver fibrosis are not fully understood. Here, we show that deletion of a nuclear seven transmembrane protein, TM7SF3, accelerates HSC activation in liver organoids, primary human HSCs, and in vivo in metabolic-dysfunction-associated steatohepatitis (MASH) mice, leading to activation of the fibrogenic program and HSC proliferation. Thus, TM7SF3 knockdown promotes alternative splicing of the Hippo pathway transcription factor, TEAD1, by inhibiting the splicing factor heterogeneous nuclear ribonucleoprotein U (hnRNPU). This results in the exclusion of the inhibitory exon 5, generating a more active form of TEAD1 and triggering HSC activation. Furthermore, inhibiting TEAD1 alternative splicing with a specific antisense oligomer (ASO) deactivates HSCs in vitro and reduces MASH diet-induced liver fibrosis. In conclusion, by inhibiting TEAD1 alternative splicing, TM7SF3 plays a pivotal role in mitigating HSC activation and the progression of MASH-related fibrosis.
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Affiliation(s)
- Roi Isaac
- Division of Endocrinology & Metabolism, Department of Medicine, University of California San Diego, La Jolla, CA 92093, USA
| | - Gautam Bandyopadhyay
- Division of Endocrinology & Metabolism, Department of Medicine, University of California San Diego, La Jolla, CA 92093, USA
| | - Theresa V Rohm
- Division of Endocrinology & Metabolism, Department of Medicine, University of California San Diego, La Jolla, CA 92093, USA
| | - Sion Kang
- Division of Endocrinology & Metabolism, Department of Medicine, University of California San Diego, La Jolla, CA 92093, USA
| | - Jinyue Wang
- Division of Endocrinology & Metabolism, Department of Medicine, University of California San Diego, La Jolla, CA 92093, USA
| | - Narayan Pokhrel
- Department of Psychiatry, University of California San Diego, La Jolla, CA 92093, USA
| | - Sadatsugu Sakane
- Division of Endocrinology & Metabolism, Department of Medicine, University of California San Diego, La Jolla, CA 92093, USA; Department of Surgery, University of California San Diego, School of Medicine, La Jolla, CA 92093, USA
| | - Rizaldy Zapata
- Division of Endocrinology & Metabolism, Department of Medicine, University of California San Diego, La Jolla, CA 92093, USA
| | - Avraham M Libster
- Department of Psychiatry, University of California San Diego, La Jolla, CA 92093, USA
| | - Yaron Vinik
- Department of Molecular Cell Biology, Weizmann Institute of Science, Rehovot, 76100, Israel
| | - Asres Berhan
- Division of Pulmonary, Critical Care, Sleep Medicine and Physiology, Department of Medicine, University of California San Diego, La Jolla, CA 92093, USA
| | - Tatiana Kisseleva
- Department of Surgery, University of California San Diego, School of Medicine, La Jolla, CA 92093, USA
| | - Zea Borok
- Division of Pulmonary, Critical Care, Sleep Medicine and Physiology, Department of Medicine, University of California San Diego, La Jolla, CA 92093, USA
| | - Yehiel Zick
- Department of Molecular Cell Biology, Weizmann Institute of Science, Rehovot, 76100, Israel
| | - Francesca Telese
- Department of Psychiatry, University of California San Diego, La Jolla, CA 92093, USA
| | - Nicholas J G Webster
- Division of Endocrinology & Metabolism, Department of Medicine, University of California San Diego, La Jolla, CA 92093, USA; VA San Diego Healthcare System, San Diego, CA, USA
| | - Jerrold M Olefsky
- Division of Endocrinology & Metabolism, Department of Medicine, University of California San Diego, La Jolla, CA 92093, USA.
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Zhou JL, de Guglielmo G, Ho AJ, Kallupi M, Pokhrel N, Li HR, Chitre AS, Munro D, Mohammadi P, Carrette LLG, George O, Palmer AA, McVicker G, Telese F. Single-nucleus genomics in outbred rats with divergent cocaine addiction-like behaviors reveals changes in amygdala GABAergic inhibition. Nat Neurosci 2023; 26:1868-1879. [PMID: 37798411 PMCID: PMC10620093 DOI: 10.1038/s41593-023-01452-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2022] [Accepted: 09/06/2023] [Indexed: 10/07/2023]
Abstract
The amygdala processes positive and negative valence and contributes to addiction, but the cell-type-specific gene regulatory programs involved are unknown. We generated an atlas of single-nucleus gene expression and chromatin accessibility in the amygdala of outbred rats with high and low cocaine addiction-like behaviors following prolonged abstinence. Differentially expressed genes between the high and low groups were enriched for energy metabolism across cell types. Rats with high addiction index (AI) showed increased relapse-like behaviors and GABAergic transmission in the amygdala. Both phenotypes were reversed by pharmacological inhibition of the glyoxalase 1 enzyme, which metabolizes methylglyoxal-a GABAA receptor agonist produced by glycolysis. Differences in chromatin accessibility between high and low AI rats implicated pioneer transcription factors in the basic helix-loop-helix, FOX, SOX and activator protein 1 families. We observed opposite regulation of chromatin accessibility across many cell types. Most notably, excitatory neurons had greater accessibility in high AI rats and inhibitory neurons had greater accessibility in low AI rats.
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Affiliation(s)
- Jessica L Zhou
- Bioinformatics and Systems Biology Program, University of California San Diego, La Jolla, CA, USA
- Integrative Biology Laboratory, Salk Institute for Biological Studies, La Jolla, CA, USA
| | | | - Aaron J Ho
- Integrative Biology Laboratory, Salk Institute for Biological Studies, La Jolla, CA, USA
| | - Marsida Kallupi
- Department of Psychiatry, University of California, San Diego, La Jolla, CA, USA
| | - Narayan Pokhrel
- Department of Psychiatry, University of California, San Diego, La Jolla, CA, USA
| | - Hai-Ri Li
- Department of Medicine, University of California San Diego, La Jolla, CA, USA
| | - Apurva S Chitre
- Department of Psychiatry, University of California, San Diego, La Jolla, CA, USA
| | - Daniel Munro
- Department of Psychiatry, University of California, San Diego, La Jolla, CA, USA
- Department of Integrative Structural and Computational Biology, The Scripps Research Institute, La Jolla, CA, USA
| | - Pejman Mohammadi
- Department of Integrative Structural and Computational Biology, The Scripps Research Institute, La Jolla, CA, USA
- Center for Immunity and Immunotherapies, Seattle Children's Research Institute, Seattle, WA, USA
- Department of Pediatrics, University of Washington School of Medicine, Seattle, WA, USA
- Department of Genome Sciences, University of Washington, Seattle, WA, USA
| | | | - Olivier George
- Department of Psychiatry, University of California, San Diego, La Jolla, CA, USA
| | - Abraham A Palmer
- Department of Psychiatry, University of California, San Diego, La Jolla, CA, USA
- Institute for Genomic Medicine, University of California San Diego, La Jolla, CA, USA
| | - Graham McVicker
- Bioinformatics and Systems Biology Program, University of California San Diego, La Jolla, CA, USA.
- Integrative Biology Laboratory, Salk Institute for Biological Studies, La Jolla, CA, USA.
| | - Francesca Telese
- Department of Psychiatry, University of California, San Diego, La Jolla, CA, USA.
- Department of Medicine, University of California San Diego, La Jolla, CA, USA.
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Zhou JL, de Guglielmo G, Ho AJ, Kallupi M, Pokhrel N, Li HR, Chitre AS, Munro D, Mohammadi P, Carrette LLG, George O, Palmer AA, McVicker G, Telese F. Author Correction: Single-nucleus genomics in outbred rats with divergent cocaine addiction-like behaviors reveals changes in amygdala GABAergic inhibition. Nat Neurosci 2023; 26:2035. [PMID: 37845545 PMCID: PMC10620070 DOI: 10.1038/s41593-023-01489-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2023]
Affiliation(s)
- Jessica L Zhou
- Bioinformatics and Systems Biology Program, University of California San Diego, La Jolla, CA, USA
- Integrative Biology Laboratory, Salk Institute for Biological Studies, La Jolla, CA, USA
| | | | - Aaron J Ho
- Integrative Biology Laboratory, Salk Institute for Biological Studies, La Jolla, CA, USA
| | - Marsida Kallupi
- Department of Psychiatry, University of California, San Diego, La Jolla, CA, USA
| | - Narayan Pokhrel
- Department of Psychiatry, University of California, San Diego, La Jolla, CA, USA
| | - Hai-Ri Li
- Department of Medicine, University of California San Diego, La Jolla, CA, USA
| | - Apurva S Chitre
- Department of Psychiatry, University of California, San Diego, La Jolla, CA, USA
| | - Daniel Munro
- Department of Psychiatry, University of California, San Diego, La Jolla, CA, USA
- Department of Integrative Structural and Computational Biology, The Scripps Research Institute, La Jolla, CA, USA
| | - Pejman Mohammadi
- Department of Integrative Structural and Computational Biology, The Scripps Research Institute, La Jolla, CA, USA
- Center for Immunity and Immunotherapies, Seattle Children's Research Institute, Seattle, WA, USA
- Department of Pediatrics, University of Washington School of Medicine, Seattle, WA, USA
- Department of Genome Sciences, University of Washington, Seattle, WA, USA
| | | | - Olivier George
- Department of Psychiatry, University of California, San Diego, La Jolla, CA, USA
| | - Abraham A Palmer
- Department of Psychiatry, University of California, San Diego, La Jolla, CA, USA
- Institute for Genomic Medicine, University of California San Diego, La Jolla, CA, USA
| | - Graham McVicker
- Bioinformatics and Systems Biology Program, University of California San Diego, La Jolla, CA, USA.
- Integrative Biology Laboratory, Salk Institute for Biological Studies, La Jolla, CA, USA.
| | - Francesca Telese
- Department of Psychiatry, University of California, San Diego, La Jolla, CA, USA.
- Department of Medicine, University of California San Diego, La Jolla, CA, USA.
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Pokhrel N, Genin O, Sela-Donenfeld D, Cinnamon Y. Storage temperature dictates the ability of chicken embryos to successfully resume development by regulating expression of blastulation and gastrulation genes. Front Physiol 2022; 13:960061. [PMID: 36589431 PMCID: PMC9800875 DOI: 10.3389/fphys.2022.960061] [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] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2022] [Accepted: 11/25/2022] [Indexed: 12/23/2022] Open
Abstract
The avian embryo has a remarkable ability that allows it to suspend its development during blastulation for a long time at low temperatures, and to resume normal development when incubated. This ability is used by poultry hatcheries to store eggs prior to incubation. We have previously found that this ability correlates with the temperature during storage; embryos recover much better following prolonged storage at 12°C rather than at 18°C. However, the molecular and cellular mechanisms underlying these differences are poorly understood. To successfully resume development following storage, the embryo has to shift from the blastulation phase to gastrulation. Several genes are known to partake in the blastulation-to-gastrulation transition under normal conditions, such as the pluripotency-related genes Inhibitor of DNA Binding 2 (ID2) and NANOG that are expressed during blastulation, and the gastrulation-regulating genes NODAL and Brachyury (TBXT). However, their expression and activity following storage is unknown. To elucidate the molecular mechanisms that initiate the ability to successfully transit from blastulation to gastrulation following storage, embryos were stored for 28 days at 12°C or 18°C, and were assessed either prior to incubation, 12, or 18 h of incubation at 37.8°C. Immediately following storage at 18°C group showed remarkable impaired morphology compared to the blastoderm of the 12°C group and of non-stored control embryos. Concurrently with these, expression of ID2 and NANOG was maintained following storage at 12°C similar to the control group, but was significantly reduced upon storage at 18°C. Nevertheless, when the 18°C-stored embryos were incubated, the morphology and the reduced genes were reverted to resemble those of the 12°C group. At variance, key gastrulation genes, NODAL and its downstream effector Brachyury (TBXT), which were similarly expressed in the control and the 12°C group, were not restored in the 18°C embryos following incubation. Notably, ectopic administration of Activin rescued NODAL and TBXT expression in the 18°C group, indicating that these embryos maintain the potential to initiate. Collectively, this study suggests a temperature-dependent mechanisms that direct the transition from blastulation to gastrulation. These mechanisms promote a successful developmental resumption following prolonged storage at low temperatures.
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Affiliation(s)
- Narayan Pokhrel
- Agriculture Research Organization, Volcani Center, Department of Poultry and Aquaculture Science, Rishon LeTsiyon, Israel,Koret School of Veterinary Medicine, The Robert H. Smith Faculty of Agriculture, Food and Environment, The Hebrew University of Jerusalem, Rehovot, Israel
| | - Olga Genin
- Agriculture Research Organization, Volcani Center, Department of Poultry and Aquaculture Science, Rishon LeTsiyon, Israel
| | - Dalit Sela-Donenfeld
- Koret School of Veterinary Medicine, The Robert H. Smith Faculty of Agriculture, Food and Environment, The Hebrew University of Jerusalem, Rehovot, Israel,*Correspondence: Dalit Sela-Donenfeld, ; Yuval Cinnamon,
| | - Yuval Cinnamon
- Agriculture Research Organization, Volcani Center, Department of Poultry and Aquaculture Science, Rishon LeTsiyon, Israel,*Correspondence: Dalit Sela-Donenfeld, ; Yuval Cinnamon,
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Basnet A, Tamang B, Pokhrel N, Khadka S, Shrestha MR, Ghimire S, Prajapati R, Thapa S, Duwal Shrestha SK, Chand AB, Amatya I, Rai SK. First-Generation SARS-CoV-2 Vaccines: A Comparative Analysis between Vaccinated and Unvaccinated Hospitalized Patients Infected with SARS-CoV-2. Kathmandu Univ Med J (KUMJ) 2022; 20:316-322. [PMID: 37042373] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/13/2023]
Abstract
Background Severe acute respiratory syndrome corona virus-2 (SARS-CoV-2) variants, which have emerged due to several mutations in spike protein, have a potential to escape immune protection provided by the first-generation vaccines, thereby resulting in breakthrough infections. Objective To identify the socio-demographic factors, clinical features, and outcomes in both vaccinated and unvaccinated hospitalized patients infected with SARS-CoV-2. Method Socio-demographic details, clinical features, and the outcomes among fully vaccinated (double for Covishield/AstraZeneca and BBIBP-CorV and single for Janssen), partially vaccinated, and unvaccinated hospitalized patients with coronavirus disease of 2019 (COVID-19) were collected and analyzed using SPSS version 17. Result Among the hospitalized COVID-19 patients (n=299), 175 (58.5%) patients received a single-dose, 82 (27.4%) double-dose, and 124 (41.5%) did not receive any dose of the COVID-19 vaccines. The risk of SARS-CoV-2 infection when compared between vaccinated and unvaccinated patients was found to be associated among professional degree holders (23.4% versus 9.7%) (p<0.05), professional workers (43.4% vs. 25.0%) (p<0.05), hospitalization to general ward (76.6% vs. 72.6%) (p<0.05), and presence of multiple symptoms (> or equel 3) (86.8% vs. 75.0%) (p>0.05) and comorbidities (> or equal 2) (15.5% vs. 13.7%) (p>0.05). Despite such approximate incidences, the risk of in-hospital mortality among the vaccinated patients was reduced (0.6% vs. 3.2%) (p>0.05), when compared to the unvaccinated patients. The risk of in-hospital mortality was associated with the older age and the presence of multiple comorbidities including bronchial asthma, diabetes, and hypertension. Conclusion Full or partial vaccination against the SARS-CoV-2 variants of concerns might be effective in preventing in-hospital mortality among COVID-19 patients.
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Affiliation(s)
- A Basnet
- Department of Medical Microbiology, Shi-Gan International College of Science and Technology, Tribhuvan University, Shankha marg, Kathmandu, Nepal. and Department of Clinical Laboratory, Nepal Armed Police Force Hospital, Balambu, Kathmandu, Nepal
| | - B Tamang
- Department of Clinical Laboratory, Nepal Armed Police Force Hospital, Balambu, Kathmandu, Nepal
| | - N Pokhrel
- Research Section, Nepal Health Research Council, Kathmandu, Ramshah path, Kathmandu, Nepal
| | - S Khadka
- Department of Immunology, Mayo Clinic, Rochester, Minnesota, United States. and Department of Microbiology and Immunology, Stanford University, Palo Alto, California, United States
| | - M R Shrestha
- Department of Clinical Laboratory, Nepal Armed Police Force Hospital, Balambu, Kathmandu, Nepal
| | - S Ghimire
- Department of Clinical Laboratory, Nepal Armed Police Force Hospital, Balambu, Kathmandu, Nepal
| | - R Prajapati
- Department of Clinical Laboratory, Nepal Armed Police Force Hospital, Balambu, Kathmandu, Nepal
| | - S Thapa
- Department of Clinical Laboratory, Nepal Armed Police Force Hospital, Balambu, Kathmandu, Nepal
| | - S K Duwal Shrestha
- Department of Orthopedic, Nepal Armed Police Force Hospital, Balambu, Kathmandu, Nepal
| | - A B Chand
- Department of Clinical Laboratory, KIST Medical College and Teaching Hospital, Gwarko, Lalitpur, Nepal
| | - I Amatya
- Research Section, Nepal Health Research Council, Kathmandu, Ramshah path, Kathmandu, Nepal
| | - S K Rai
- Research Division, Nepal Medical College and Teaching Hospital, Gokarneswor-08, Kathmandu, Nepal
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Pokhrel S, Pokhrel R, Pokhrel N, Khadka N, Pardhe B. T175 MPV as an indicator of vascular complication in poor control diabetic population. Clin Chim Acta 2022. [DOI: 10.1016/j.cca.2022.04.654] [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: 11/03/2022]
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Pokhrel N. T056 Comparison, correlation and predictability of AOPP, IMA and cardiac markers CKMB activity and troponin T in patients with cardiac and non-cardiac chest pain. Clin Chim Acta 2022. [DOI: 10.1016/j.cca.2022.04.523] [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: 11/03/2022]
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Pokhrel R, Pokhrel N, Pokhrel S, Chaudhary A, Khadka N. M217 Six sigma metric evaluations of routine biochemistry parameters and glycated hemoglobin in a fully automated clinical chemistry laboratory. Clin Chim Acta 2022. [DOI: 10.1016/j.cca.2022.04.405] [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: 11/03/2022]
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Pokhrel N, Sela-Donenfeld D, Cinnamon Y. The chick blastoderm during diapause, a landmark for optimization of preincubation storage conditions. Poult Sci 2021; 100:101227. [PMID: 34175796 PMCID: PMC8242057 DOI: 10.1016/j.psj.2021.101227] [Citation(s) in RCA: 6] [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] [Received: 01/24/2021] [Revised: 04/05/2021] [Accepted: 04/09/2021] [Indexed: 11/24/2022] Open
Abstract
At the time of oviposition, the chicken embryo is in its blastodermal stage. The blastoderm displays the unique ability to undergo developmental arrest at low temperatures in a process called “embryonic diapause.” In the wild, diapause occurs in freshly laid eggs until the last egg of the clutch has been laid, providing an evolutionary advantage to hens that can synchronously hatch their eggs. The poultry industry utilizes the diapause phenomenon to store eggs before incubation, thereby mitigating their logistic problems. The embryos can only be stored at particular embryonic stages—termed “diapause developmental window” (DW)—if they are to continue to develop normally thereafter. Both cellular and molecular mechanisms define the limits of this DW which broadly comply with onset of blastulation to early gastrulation. Storage conditions affect the cellular and molecular characteristics of the embryo during this window and their ability to successfully resume development (SRD). At storage temperatures of ~12°C to 18°C, embryos can undergo diapause for a short period (up to 7 days (d)) without affecting SRD. However, following longer period of diapause (up to 28 d), embryo stored at ~12°C, but not at ~18°C, can resume development normally. Moreover, eggs can be heated before or during the storage period which will lead to their commencing in development; however, unlike the non-heated embryos, the storage temperature for heated embryos, which are more advance in developing, is not clear. Thus, based on SRD, this review brings evidence supporting the notion that a lower storage temperature is beneficial for early-stage blastoderms whereas a higher storage temperature is favorable for later-stage/gastrulating embryos. Our understanding of the molecular mechanisms underlying the relationship between storage temperature and development stage within the DW is rather limited. However, it is expected to become relevant in light of the effect of selective breeding of modern avian birds on the advancement of embryonic development stage. Thus, this review discusses parameters that are regulated during the DW and affect SRD, and presents the need to adopt new storage techniques. The pre-managerial decision of required duration of storage with manipulation of storage temperature in the currently used storage techniques may improve SRD characteristics.
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Affiliation(s)
- N Pokhrel
- Agricultural Research Organization, Volcani Center, Department of Poultry and Aquaculture Science, Rishon LeTsiyon, Israel; Koret School of Veterinary Medicine, The Robert H. Smith Faculty of Agriculture, Food and Environment, The Hebrew University of Jerusalem, Rehovot, Israel
| | - D Sela-Donenfeld
- Koret School of Veterinary Medicine, The Robert H. Smith Faculty of Agriculture, Food and Environment, The Hebrew University of Jerusalem, Rehovot, Israel
| | - Y Cinnamon
- Agricultural Research Organization, Volcani Center, Department of Poultry and Aquaculture Science, Rishon LeTsiyon, Israel.
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Sah G, Sapkota A, Adhikari J, Singh J, Pokhrel N. P3.15-25 Assessment of Depression Among Advanced Stage Lung Cancer Patients in Developing Country. J Thorac Oncol 2018. [DOI: 10.1016/j.jtho.2018.08.1901] [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: 10/28/2022]
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Pokhrel N, Cohen EBT, Genin O, Ruzal M, Sela-Donenfeld D, Cinnamon Y. Effects of storage conditions on hatchability, embryonic survival and cytoarchitectural properties in broiler from young and old flocks. Poult Sci 2018; 97:1429-1440. [DOI: 10.3382/ps/pex393] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2017] [Accepted: 01/13/2018] [Indexed: 12/27/2022] Open
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Pokhrel N, Ben-Tal Cohen E, Genin O, Sela-Donenfeld D, Cinnamon Y. Cellular and morphological characterization of blastoderms from freshly laid broiler eggs. Poult Sci 2017; 96:4399-4408. [DOI: 10.3382/ps/pex242] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2017] [Accepted: 08/10/2017] [Indexed: 11/20/2022] Open
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Lovelock JD, Monasky MM, Jeong EM, Lardin HA, Liu H, Patel BG, Taglieri DM, Gu L, Kumar P, Pokhrel N, Zeng D, Belardinelli L, Sorescu D, Solaro RJ, Dudley SC. Ranolazine improves cardiac diastolic dysfunction through modulation of myofilament calcium sensitivity. Circ Res 2012; 110:841-50. [PMID: 22343711 DOI: 10.1161/circresaha.111.258251] [Citation(s) in RCA: 141] [Impact Index Per Article: 11.8] [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] [Indexed: 01/19/2023]
Abstract
RATIONALE Previously, we demonstrated that a deoxycorticosterone acetate (DOCA)-salt hypertensive mouse model produces cardiac oxidative stress and diastolic dysfunction with preserved systolic function. Oxidative stress has been shown to increase late inward sodium current (I(Na)), reducing the net cytosolic Ca(2+) efflux. OBJECTIVE Oxidative stress in the DOCA-salt model may increase late I(Na), resulting in diastolic dysfunction amenable to treatment with ranolazine. METHODS AND RESULTS Echocardiography detected evidence of diastolic dysfunction in hypertensive mice that improved after treatment with ranolazine (E/E':sham, 31.9 ± 2.8, sham+ranolazine, 30.2 ± 1.9, DOCA-salt, 41.8 ± 2.6, and DOCA-salt+ranolazine, 31.9 ± 2.6; P=0.018). The end-diastolic pressure-volume relationship slope was elevated in DOCA-salt mice, improving to sham levels with treatment (sham, 0.16 ± 0.01 versus sham+ranolazine, 0.18 ± 0.01 versus DOCA-salt, 0.23 ± 0.2 versus DOCA-salt+ranolazine, 0.17 ± 0.0 1 mm Hg/L; P<0.005). DOCA-salt myocytes demonstrated impaired relaxation, τ, improving with ranolazine (DOCA-salt, 0.18 ± 0.02, DOCA-salt+ranolazine, 0.13 ± 0.01, sham, 0.11 ± 0.01, sham+ranolazine, 0.09 ± 0.02 seconds; P=0.0004). Neither late I(Na) nor the Ca(2+) transients were different from sham myocytes. Detergent extracted fiber bundles from DOCA-salt hearts demonstrated increased myofilament response to Ca(2+) with glutathionylation of myosin binding protein C. Treatment with ranolazine ameliorated the Ca(2+) response and cross-bridge kinetics. CONCLUSIONS Diastolic dysfunction could be reversed by ranolazine, probably resulting from a direct effect on myofilaments, indicating that cardiac oxidative stress may mediate diastolic dysfunction through altering the contractile apparatus.
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Affiliation(s)
- Joshua D Lovelock
- Section of Cardiology, University of Illinois at Chicago, 60612, USA
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Shrestha S, Basukala S, Pokhrel N. Primary vesicoureteric reflux in Nepalese children. Kathmandu Univ Med J (KUMJ) 2008; 6:75-78. [PMID: 18604119] [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: 05/26/2023]
Abstract
BACKGROUND Vesicoureteric reflux (VUR) is a common urinary tract abnormality observed in children with urinary tract infection and children with VUR are at risk of reflux nephropathy and renal parenchymal damage. In Nepal, till date there are no published series of VUR in children. AIMS AND OBJECTIVES To study the incidence of VUR in Nepalese children with Urinary tract infection (UTI), to analyze the age and sex wise distribution and clinical course of children with VUR together with the rate of spontaneous resolution of VUR in children METHODOLOGY A retrospective hospital based study conducted at Department of Paediatrics Patan Hospital from June 2002 to December 2005. Hospital record files of all the children undergoing micturating cystourethrography (MCUG) as part of UTI work up were traced and the files of children with positive VUR were separated and analyzed. RESULTS Over the 3 and a half years study period total 145 micturating cystourethrograph were done in children with UTI, out of which 35(24%) were positive for VUR. Among the children with VUR, the most common age group was between two to twelve months and the male female ratio was 1.2:1.More than 60% had bilateral VUR and bilateral grade II VUR was the most common finding. Renal scan (DMSA) was done in only 5 cases and out of those two showed renal scaring. Eight cases underwent repeat MCUG after 1-1 1/2 years and spontaneous resolution of VUR was seen in 5 (62.5%) cases. Six cases were lost in follow up, 5 cases went for surgical intervention. CONCLUSION The incidence of VUR in children with UTI in our part is almost comparable to western data. Children with VUR need regular and long term follow-up.
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Pokhrel N, Maharjan N, Dhakal B, Arora RR. Cardiorenal syndrome: A literature review. Exp Clin Cardiol 2008; 13:165-70. [PMID: 19343160 PMCID: PMC2663478] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2008] [Accepted: 08/12/2008] [Indexed: 05/27/2023]
Abstract
The incidence of cardiorenal syndrome is increasing; however, its pathophysiology and effective management are still not well understood. For many years, diuretics have been the mainstay of treatment for cardiorenal syndrome, although a significant proportion of patients develop resistance to diuretics and even deteriorate while on diuretics. Trials on different ways to counteract diuretic resistance and newer treatment modalities, such as nesiritide, arginine vasopressin receptor antagonists, adenosine receptor antagonists and ultrafiltration, have shown promising results.
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Affiliation(s)
- Narayan Pokhrel
- Department of Medicine, Rosalind Franklin University/Chicago Medical School, Chicago, Illinois, USA
| | - Najindra Maharjan
- Department of Medicine, Rosalind Franklin University/Chicago Medical School, Chicago, Illinois, USA
| | - Bismita Dhakal
- Department of Medicine, Rosalind Franklin University/Chicago Medical School, Chicago, Illinois, USA
| | - Rohit R Arora
- Department of Medicine, Rosalind Franklin University/Chicago Medical School, Chicago, Illinois, USA
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