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Tiwari A, Mehrotra M, Hasan A, Agarwal J, Singh GK. "HBV liver decompensation: Antiviral therapy for all". J Gastroenterol Hepatol 2023; 38:833-834. [PMID: 36999212 DOI: 10.1111/jgh.16187] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/22/2023] [Accepted: 03/28/2023] [Indexed: 04/01/2023]
Affiliation(s)
- A Tiwari
- Department of Gastroenterology Regency Hospital Ltd, Kanpur, Uttar Pradesh, India, 208005
| | - M Mehrotra
- Department of Gastroenterology Regency Hospital Ltd, Kanpur, Uttar Pradesh, India, 208005
| | - A Hasan
- Department of Gastroenterology Regency Hospital Ltd, Kanpur, Uttar Pradesh, India, 208005
| | - J Agarwal
- Regency Hospital Ltd, Kanpur, Uttar Pradesh, India, 208005
| | - G K Singh
- Regency Hospital Ltd, Kanpur, Uttar Pradesh, India, 208005
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Kang IH, Baliga UK, Chatterjee S, Chakraborty P, Choi S, Buchweitz N, Li H, Wu Y, Yao H, Mehrotra S, Mehrotra M. Quantitative increase in T regulatory cells enhances bone remodeling in osteogenesis imperfecta. iScience 2022; 25:104818. [PMID: 36034228 PMCID: PMC9400089 DOI: 10.1016/j.isci.2022.104818] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2021] [Revised: 06/07/2022] [Accepted: 07/19/2022] [Indexed: 02/03/2023] Open
Abstract
Osteogenesis imperfecta (OI) is characterized by repeated bone fractures. Recent studies have shown that T lymphocytes and regulatory T cells (Tregs) regulate the functions of osteoclasts and osteoblasts, thus playing a role in bone turnover. We demonstrate an activated effector phenotype and higher secretion of pro-inflammatory cytokines, IFN-γ, and TNF-α in OI peripheral T cells as compared with wild-type (WT). Suppressive Tregs (spleen and thymus) were qualitatively similar, whereas there was a quantitative decrease in OI versus WT. Restoring Treg numbers by systemic transplantation in OI mice resulted in reduced T cell activation and effector cytokine secretion that correlated with significant improvements in tibial trabecular and cortical bone parameters and stiffness of femur, along with increased osteoblast mineralization and decreased osteoclast numbers. Therefore, Tregs can dampen the pro-inflammatory environment and enhance bone remodeling in OI mice. Thus, this study will be helpful in developing future autologous immunotherapy-based treatment modalities for OI.
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Affiliation(s)
- In-Hong Kang
- Department of Pathology and Laboratory Medicine, Medical University of South Carolina, Charleston, SC 29425, USA
- Department of Microbiology and Immunology, Medical University of South Carolina, Charleston, SC, 29425, USA
| | - Uday K. Baliga
- Department of Pathology and Laboratory Medicine, Medical University of South Carolina, Charleston, SC 29425, USA
| | - Shilpak Chatterjee
- Department of Surgery, Medical University of South Carolina, Charleston, SC 29425, USA
| | - Paramita Chakraborty
- Department of Surgery, Medical University of South Carolina, Charleston, SC 29425, USA
| | - Seungho Choi
- Department of Surgery, Medical University of South Carolina, Charleston, SC 29425, USA
| | - Nathan Buchweitz
- Department of Orthopedics, Medical University of South Carolina, Charleston, SC 29425, USA
- Department of Bioengineering, Clemson University, Clemson, SC 29634, USA
- Clemson-MUSC Joint Bioengineering Program, South Carolina, USA
| | - Hong Li
- Depatment of Public Health Sciences, Medical University of South Carolina, Charleston, SC 29425, USA
| | - Yongren Wu
- Department of Orthopedics, Medical University of South Carolina, Charleston, SC 29425, USA
- Department of Bioengineering, Clemson University, Clemson, SC 29634, USA
- Clemson-MUSC Joint Bioengineering Program, South Carolina, USA
| | - Hai Yao
- Department of Orthopedics, Medical University of South Carolina, Charleston, SC 29425, USA
- Department of Bioengineering, Clemson University, Clemson, SC 29634, USA
- Clemson-MUSC Joint Bioengineering Program, South Carolina, USA
- Department of Oral Health Sciences, Medical University of South Carolina, Charleston, SC 29425, USA
| | - Shikhar Mehrotra
- Department of Surgery, Medical University of South Carolina, Charleston, SC 29425, USA
- Hollings Cancer Center, Medical University of South Carolina, Charleston, SC 29425, USA
| | - Meenal Mehrotra
- Department of Pathology and Laboratory Medicine, Medical University of South Carolina, Charleston, SC 29425, USA
- Department of Surgery, Medical University of South Carolina, Charleston, SC 29425, USA
- Department of Oral Health Sciences, Medical University of South Carolina, Charleston, SC 29425, USA
- Hollings Cancer Center, Medical University of South Carolina, Charleston, SC 29425, USA
- Center for Oral Health Research, Medical University of South Carolina, Charleston, SC 29425, USA
- Corresponding author
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Chakraborty P, Parikh RY, Choi S, Mehrotra M, Maldonado EN, Wang H, Diehl JA, Gangaraju VK, Mehrotra S. Abstract LB014: Carbon monoxide induced PERK regulated autophagy reprograms anti-tumor T cells with robust immunometabolic phenotype. Cancer Res 2022. [DOI: 10.1158/1538-7445.am2022-lb014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
Mitochondria and Endoplasmic reticulum (ER) share structural and functional networks to maintain cellular homeostasis and activate well-orchestrated signaling processes to shape cells' fate and function. While persistent ER stress (ERS) response leads to mitochondrial collapse, moderate ERS condition drives mitochondrial biogenesis and function. So far, various strategies have been tested to enhance the mitochondrial function in T cells to improve their anti-tumor potential. However, strategies targeting ER-Mitochondria crosstalk (by employing moderate ERS condition) to boost the anti-tumor T cell function have not been exploited yet. Thus, in the present study, we used carbon monoxide (CO), a short-lived gaseous molecule, to test if engaging moderate ERS conditions can improve T cells mitochondrial biogenesis, function, and anti-tumor therapeutic efficacy. Using melanoma antigen gp100 reactive T cells, we identify that CO induced transient activation of ERS sensor ‘protein kinase R-like endoplasmic reticulum kinase (PERK)’ dramatically increase anti-tumor T cell function. Furthermore, mechanistically we found that CO-induced PERK activation temporarily halts protein translation and induces protective autophagy (that includes mitophagy). To get further insight into how CO treatment kinetically regulates autophagic activity in T cells, we used LC3-GFP to differentiate between the cells that prepare themselves to undergo active autophagy (LC3-GFPpos) and those that fail to enter into the process (LC3-GFPneg). Using Ag-specific LC3-GFP expressing T cells, we demonstrate that LC3-GFPpos T cells show robust anti-tumor potential. Moreover, LC3-GFPneg shows a T regulatory-like phenotype, harbors dysfunctional mitochondria, and accumulates abnormal metabolite content. These anomalous ratios of metabolites render the cells with a hypermethylated state and distinct epigenetic profile limiting their anti-tumor activity. Overall, this preclinical data highlights that ERS-mediated activation of autophagy pathways modifies the mitochondrial function and epigenetically reprogram the T cells towards a superior anti-tumor phenotype and can be therapeutically translated to achieve robust tumor control in adoptive transfer therapies.
Citation Format: Paramita Chakraborty, Rasesh Y. Parikh, Seungho Choi, Meenal Mehrotra, Eduardo N. Maldonado, Hongjun Wang, J. Alan Diehl, Vamsi K. Gangaraju, Shikhar Mehrotra. Carbon monoxide induced PERK regulated autophagy reprograms anti-tumor T cells with robust immunometabolic phenotype [abstract]. In: Proceedings of the American Association for Cancer Research Annual Meeting 2022; 2022 Apr 8-13. Philadelphia (PA): AACR; Cancer Res 2022;82(12_Suppl):Abstract nr LB014.
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Affiliation(s)
| | | | - Seungho Choi
- 1Medical University Of South Carolina, Charleston, SC
| | | | | | - Hongjun Wang
- 1Medical University Of South Carolina, Charleston, SC
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Chakraborty P, Parikh RY, Choi S, Tran D, Gooz M, Hedley ZT, Kim DS, Pytel D, Kang I, Nadig SN, Beeson GC, Ball L, Mehrotra M, Wang H, Berto S, Palanisamy V, Li H, Chatterjee S, Rodriguez PC, Maldonado EN, Diehl JA, Gangaraju VK, Mehrotra S. Carbon Monoxide Activates PERK-Regulated Autophagy to Induce Immunometabolic Reprogramming and Boost Antitumor T-cell Function. Cancer Res 2022; 82:1969-1990. [PMID: 35404405 PMCID: PMC9117468 DOI: 10.1158/0008-5472.can-21-3155] [Citation(s) in RCA: 19] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2021] [Revised: 01/27/2022] [Accepted: 03/17/2022] [Indexed: 11/16/2022]
Abstract
Mitochondria and endoplasmic reticulum (ER) share structural and functional networks and activate well-orchestrated signaling processes to shape cells' fate and function. While persistent ER stress (ERS) response leads to mitochondrial collapse, moderate ERS promotes mitochondrial function. Strategies to boost antitumor T-cell function by targeting ER-mitochondria cross-talk have not yet been exploited. Here, we used carbon monoxide (CO), a short-lived gaseous molecule, to test whether engaging moderate ERS conditions can improve mitochondrial and antitumor functions in T cells. In melanoma antigen-specific T cells, CO-induced transient activation of ERS sensor protein kinase R-like endoplasmic reticulum kinase (PERK) significantly increased antitumor T-cell function. Furthermore, CO-induced PERK activation temporarily halted protein translation and induced protective autophagy, including mitophagy. The use of LC3-GFP enabled differentiation between the cells that prepare themselves to undergo active autophagy (LC3-GFPpos) and those that fail to enter the process (LC3-GFPneg). LC3-GFPpos T cells showed strong antitumor potential, whereas LC3-GFPneg cells exhibited a T regulatory-like phenotype, harbored dysfunctional mitochondria, and accumulated abnormal metabolite content. These anomalous ratios of metabolites rendered the cells with a hypermethylated state and distinct epigenetic profile, limiting their antitumor activity. Overall, this study shows that ERS-activated autophagy pathways modify the mitochondrial function and epigenetically reprogram T cells toward a superior antitumor phenotype to achieve robust tumor control. SIGNIFICANCE Transient activation of ER stress with carbon monoxide drives mitochondrial biogenesis and protective autophagy that elicits superior antitumor T-cell function, revealing an approach to improving adoptive cell efficacy therapy.
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Affiliation(s)
- Paramita Chakraborty
- Department of Surgery, Medical University of South Carolina, Charleston, South Carolina
| | - Rasesh Y Parikh
- Department of Biochemistry and Molecular Biology, Medical University of South Carolina, Charleston, South Carolina
| | - Seungho Choi
- Department of Surgery, Medical University of South Carolina, Charleston, South Carolina
| | - Danh Tran
- Department of Surgery, Medical University of South Carolina, Charleston, South Carolina
| | - Monika Gooz
- Department of Drug Discovery and Biomedical Sciences, Medical University of South Carolina, Charleston, South Carolina
| | - Zachariah T Hedley
- Department of Surgery, Medical University of South Carolina, Charleston, South Carolina
| | - Do-Sung Kim
- Department of Surgery, Medical University of South Carolina, Charleston, South Carolina
| | - Dariusz Pytel
- Department of Biochemistry and Molecular Biology, Medical University of South Carolina, Charleston, South Carolina
- Department of Clinical Chemistry and Biochemistry, Medical University of Lodz, Lodz, Poland
| | - Inhong Kang
- Department of Pathology & Laboratory Medicine, Medical University of South Carolina, Charleston, South Carolina
| | - Satish N Nadig
- Department of Surgery, Medical University of South Carolina, Charleston, South Carolina
| | - Gyda C Beeson
- Department of Drug Discovery and Biomedical Sciences, Medical University of South Carolina, Charleston, South Carolina
| | - Lauren Ball
- Department of Cell and Molecular Pharmacology and Experimental Therapeutics, Medical University of South Carolina, Charleston, South Carolina
| | - Meenal Mehrotra
- Department of Pathology & Laboratory Medicine, Medical University of South Carolina, Charleston, South Carolina
| | - Hongjun Wang
- Department of Surgery, Medical University of South Carolina, Charleston, South Carolina
| | - Stefano Berto
- Department of Neuroscience, Medical University of South Carolina, Charleston, South Carolina
| | - Viswanathan Palanisamy
- Department of Biochemistry and Molecular Biology, Medical University of South Carolina, Charleston, South Carolina
| | - Hong Li
- Department of Public Health, Medical University of South Carolina, Charleston, South Carolina
| | - Shilpak Chatterjee
- Department of Surgery, Medical University of South Carolina, Charleston, South Carolina
| | - Paulo C Rodriguez
- Department of Immunology, H. Lee Moffitt Cancer Center & Research Institute, Tampa, Florida
| | - Eduardo N Maldonado
- Department of Drug Discovery and Biomedical Sciences, Medical University of South Carolina, Charleston, South Carolina
| | - J Alan Diehl
- Department of Biochemistry, Case Western University, Cleveland, Ohio
| | - Vamsi K Gangaraju
- Department of Biochemistry and Molecular Biology, Medical University of South Carolina, Charleston, South Carolina
| | - Shikhar Mehrotra
- Department of Surgery, Medical University of South Carolina, Charleston, South Carolina
- Department of Microbiology & Immunology, Hollings Cancer Center, Medical University of South Carolina, Charleston, South Carolina
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Chakraborty P, Parikh RY, Choi S, Mehrotra M, Maldonado EN, Wang H, Diehl JA, Gangaraju VK, Mehrotra S. Targeting Autophagy with Carbon-monoxide Reprograms Anti-Tumor T Cells with Robust Immunometabolic Phenotype. The Journal of Immunology 2022. [DOI: 10.4049/jimmunol.208.supp.117.18] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Abstract
Mitochondria and Endoplasmic reticulum (ER) share structural and functional networks and activates well-orchestrated signaling processes to shape a cell’s fate and function. While persistent ER stress (ERS) response leads to mitochondrial collapse, moderate ERS condition promotes mitochondrial function. Strategies to boost anti-tumor T cell function by targeting ER-Mitochondria cross talk have not been exploited yet. Thus, we used carbon monoxide (CO), a short-lived gaseous molecule, to test if engaging moderate ERS conditions can improve T cells mitochondrial function and anti-tumor function. Using melanoma antigen specific T cells, we identify that CO induced transient activation of ERS sensor ‘protein kinase R-like endoplasmic reticulum kinase (PERK)’ dramatically increase anti-tumor T cell function. Furthermore, CO-induced PERK activation temporarily halts protein translation and induces protective autophagy (that includes mitophagy). To get further insight, we used LC3-GFP to differentiate between the cells that prepare themselves to undergo active autophagy (LC3-GFPpos) and those that fail to enter into the process (LC3-GFPneg). We found that LC3-GFPpos T cells show robust anti-tumor potential whereas, LC3-GFPneg cells show T regulatory-like phenotype, harbor dysfunctional mitochondria, and accumulate abnormal metabolite content. These anomalous ratios of metabolites render the cells with a hypermethylated state and distinct epigenetic profile limiting their anti-tumor activity. Overall, the study highlights that ERS activated autophagy pathways modify mitochondrial function and epigenetically reprogram the T cells towards a superior anti-tumor phenotype to achieve robust tumor control.
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Kang IH, Baliga UK, Wu Y, Mehrotra S, Yao H, LaRue AC, Mehrotra M. Hematopoietic stem cell-derived functional osteoblasts exhibit therapeutic efficacy in a murine model of osteogenesis imperfecta. Stem Cells 2021; 39:1457-1477. [PMID: 34224636 DOI: 10.1002/stem.3432] [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] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2020] [Revised: 05/03/2021] [Accepted: 06/08/2021] [Indexed: 11/08/2022]
Abstract
Currently, there is no cure for osteogenesis imperfecta (OI)-a debilitating pediatric skeletal dysplasia. Herein we show that hematopoietic stem cell (HSC) therapy holds promise in treating OI. Using single-cell HSC transplantation in lethally irradiated oim/oim mice, we demonstrate significant improvements in bone morphometric, mechanics, and turnover parameters. Importantly, we highlight that HSCs cause these improvements due to their unique property of differentiating into osteoblasts/osteocytes, depositing normal collagen-an attribute thus far assigned only to mesenchymal stem/stromal cells. To confirm HSC plasticity, lineage tracing was done by transplanting oim/oim with HSCs from two specific transgenic mice-VavR, in which all hematopoietic cells are GFP+ and pOBCol2.3GFP, where GFP is expressed only in osteoblasts/osteocytes. In both models, transplanted oim/oim mice demonstrated GFP+ HSC-derived osteoblasts/osteocytes in bones. These studies unequivocally establish that HSCs differentiate into osteoblasts/osteocytes, and HSC transplantation can provide a new translational approach for OI.
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Affiliation(s)
- In-Hong Kang
- Department of Pathology and Laboratory Medicine, Medical University of South Carolina, Charleston, South Carolina, USA
| | - Uday K Baliga
- Department of Pathology and Laboratory Medicine, Medical University of South Carolina, Charleston, South Carolina, USA
| | - Yongren Wu
- Department of Orthopedics, Medical University of South Carolina, Charleston, South Carolina, USA
- Department of Bioengineering, Clemson University, Clemson, South Carolina, USA
- Clemson-MUSC Joint Bioengineering Program, Medical University of South Carolina, Charleston, South Carolina, USA
| | - Shikhar Mehrotra
- Department of Surgery, Medical University of South Carolina, Charleston, South Carolina, USA
- Hollings Cancer Center, Medical University of South Carolina, Charleston, South Carolina, USA
| | - Hai Yao
- Department of Orthopedics, Medical University of South Carolina, Charleston, South Carolina, USA
- Department of Bioengineering, Clemson University, Clemson, South Carolina, USA
- Clemson-MUSC Joint Bioengineering Program, Medical University of South Carolina, Charleston, South Carolina, USA
- Department of Oral Health Sciences, Medical University of South Carolina, Charleston, South Carolina, USA
| | - Amanda C LaRue
- Department of Pathology and Laboratory Medicine, Medical University of South Carolina, Charleston, South Carolina, USA
- Hollings Cancer Center, Medical University of South Carolina, Charleston, South Carolina, USA
- Ralph H. Johnson VA Medical Center, Charleston, South Carolina, USA
| | - Meenal Mehrotra
- Department of Pathology and Laboratory Medicine, Medical University of South Carolina, Charleston, South Carolina, USA
- Hollings Cancer Center, Medical University of South Carolina, Charleston, South Carolina, USA
- Department of Oral Health Sciences, Medical University of South Carolina, Charleston, South Carolina, USA
- Center for Oral Health Research, Medical University of South Carolina, Charleston, South Carolina, USA
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Hannigan B, Ye W, Mehrotra M, Lam V, Bolivar A, Zalles S, Barkoh BA, Duose D, Hu PC, Broaddus R, Stewart J, Heymach J, Medeiros LJ, Wistuba I, Luthra R, Roy-Chowdhuri S. Liquid biopsy assay for lung carcinoma using centrifuged supernatants from fine-needle aspiration specimens. Ann Oncol 2020; 30:963-969. [PMID: 30887015 DOI: 10.1093/annonc/mdz102] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
INTRODUCTION Tumor mutation profiling is standard-of-care in lung carcinoma patients. However, comprehensive molecular profiling of small specimens, including core needle biopsy (CNB) and fine-needle aspiration (FNA) specimens, may often be inadequate due to limited tissue. Centrifuged FNA supernatants, which are typically discarded, have emerged recently as a novel liquid-based biopsy for molecular testing. In this study, we evaluate the use of lung carcinoma FNA supernatants for detecting clinically relevant mutations. METHODS Supernatants from lung carcinoma FNA samples (n = 150) were evaluated. Samples were further analyzed using next-generation sequencing (NGS) and ultrasensitive droplet digital PCR (ddPCR). Mutation profiles in a subset of samples were compared with results derived from paired tissue samples from the same patient (n = 67) and available plasma liquid biopsy assay (n = 45). RESULTS All 150 samples yielded adequate DNA and NGS were carried out successfully on 104 (90%) of 116 selected samples. Somatic mutations were detected in 82% of the samples and in 50% of these patients a clinically relevant mutation was identified that would qualify them for targeted therapy or a clinical trial. There was high overall concordance between the mutation profiles of supernatants and the corresponding tissue samples, with 100% concordance with concurrent FNA and 96% with concurrent CNB samples. Comparison of actionable driver mutations detected in supernatant versus plasma samples showed 84% concordance. CONCLUSIONS FNA supernatants can provide a valuable specimen source for genotyping lung carcinoma especially in patients with insufficient tumor tissue, thereby reducing multigene mutation profiling failure rates, improving turnaround times, and avoiding repeat biopsies.
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Affiliation(s)
- B Hannigan
- Graduate Program in Diagnostic Genetics, School of Health Professions
| | - W Ye
- Graduate Program in Diagnostic Genetics, School of Health Professions
| | - M Mehrotra
- Departments of Hematopathology, Division of Pathology and Laboratory Medicine
| | - V Lam
- Thoracic/Head and Neck Medical Oncology
| | - A Bolivar
- Graduate Program in Diagnostic Genetics, School of Health Professions
| | - S Zalles
- Graduate Program in Diagnostic Genetics, School of Health Professions
| | - B A Barkoh
- Departments of Hematopathology, Division of Pathology and Laboratory Medicine
| | - D Duose
- Translational Molecular Pathology, Division of Pathology and Laboratory Medicine
| | - P C Hu
- Graduate Program in Diagnostic Genetics, School of Health Professions
| | - R Broaddus
- Pathology, Division of Pathology and Laboratory Medicine, The University of Texas MD Anderson Cancer Center, Houston, USA
| | - J Stewart
- Pathology, Division of Pathology and Laboratory Medicine, The University of Texas MD Anderson Cancer Center, Houston, USA
| | - J Heymach
- Thoracic/Head and Neck Medical Oncology
| | - L J Medeiros
- Departments of Hematopathology, Division of Pathology and Laboratory Medicine
| | - I Wistuba
- Translational Molecular Pathology, Division of Pathology and Laboratory Medicine
| | - R Luthra
- Departments of Hematopathology, Division of Pathology and Laboratory Medicine
| | - S Roy-Chowdhuri
- Pathology, Division of Pathology and Laboratory Medicine, The University of Texas MD Anderson Cancer Center, Houston, USA.
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Mascarenhas J, Marcellino BK, Lu M, Kremyanskaya M, Fabris F, Sandy L, Mehrotra M, Houldsworth J, Najfeld V, El Jamal S, Petersen B, Moshier E, Hoffman R. A phase I study of panobinostat and ruxolitinib in patients with primary myelofibrosis (PMF) and post--polycythemia vera/essential thrombocythemia myelofibrosis (post--PV/ET MF). Leuk Res 2019; 88:106272. [PMID: 31778911 DOI: 10.1016/j.leukres.2019.106272] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2019] [Revised: 11/12/2019] [Accepted: 11/13/2019] [Indexed: 01/23/2023]
Abstract
Ruxolitinib, a selective JAK1/JAK2 inhibitor, is the current first line therapy for myelofibrosis (MF), which reduces symptomatology and splenomegaly, but does not clearly modify disease course. Panobinostat, a histone deacetylase inhibitor, was shown to be safe and tolerable in phase I and II trials and demonstrated clinical activity in approximately a third of treated patients. Combination therapy of ruxolitinib and panobinostat showed synergistic activity in a preclinical MF model, which prompted clinical evaluation of this combination in both ruxolitinib naïve and treated MF patients. Herein, we report the results of an investigator-initiated, dose escalation, phase I trial of ruxolitinib and panobinostat in 15 patients with primary MF and post-polycythemia vera/essential thrombocythemia MF. This combination treatment proved to be safe and tolerable without dose limiting thrombocytopenia and a maximum tolerated dose of both agents in combination was not determined. The majority of patients maintained stable disease with this combination treatment and 40 % attained a clinical improvement (spleen n = 5, anemia n = 1) by modified IWG-MRT at the end of 6 cycles. This is one of the first attempts of rationally designed, JAK inhibitor-based, combination therapy studies and exemplifies the feasibility of such an approach in patients with advanced MF.
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Affiliation(s)
- J Mascarenhas
- Tisch Cancer Institute, Division of Hematology/Oncology, Icahn School of Medicine at Mount Sinai, One Gustave L Levy Place, Box 1079, New York, NY, 10029, United States.
| | - B K Marcellino
- Tisch Cancer Institute, Division of Hematology/Oncology, Icahn School of Medicine at Mount Sinai, One Gustave L Levy Place, Box 1079, New York, NY, 10029, United States
| | - M Lu
- Tisch Cancer Institute, Division of Hematology/Oncology, Icahn School of Medicine at Mount Sinai, One Gustave L Levy Place, Box 1079, New York, NY, 10029, United States
| | - M Kremyanskaya
- Tisch Cancer Institute, Division of Hematology/Oncology, Icahn School of Medicine at Mount Sinai, One Gustave L Levy Place, Box 1079, New York, NY, 10029, United States
| | - F Fabris
- Tisch Cancer Institute, Division of Hematology/Oncology, Icahn School of Medicine at Mount Sinai, One Gustave L Levy Place, Box 1079, New York, NY, 10029, United States
| | - L Sandy
- Tisch Cancer Institute, Division of Hematology/Oncology, Icahn School of Medicine at Mount Sinai, One Gustave L Levy Place, Box 1079, New York, NY, 10029, United States
| | - M Mehrotra
- Pathology Department, The Mount Sinai Hospital, One Gustave L Levy Place, Box 1079, New York, NY, 10029, United States
| | - J Houldsworth
- Pathology Department, The Mount Sinai Hospital, One Gustave L Levy Place, Box 1079, New York, NY, 10029, United States
| | - V Najfeld
- Pathology Department, The Mount Sinai Hospital, One Gustave L Levy Place, Box 1079, New York, NY, 10029, United States
| | - S El Jamal
- Pathology Department, The Mount Sinai Hospital, One Gustave L Levy Place, Box 1079, New York, NY, 10029, United States
| | - B Petersen
- Pathology Department, The Mount Sinai Hospital, One Gustave L Levy Place, Box 1079, New York, NY, 10029, United States
| | - E Moshier
- Department of Biostatistics, The Mount Sinai Hospital, One Gustave L Levy Place, Box 1079, New York, NY, 10029, United States
| | - R Hoffman
- Tisch Cancer Institute, Division of Hematology/Oncology, Icahn School of Medicine at Mount Sinai, One Gustave L Levy Place, Box 1079, New York, NY, 10029, United States
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10
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Chatterjee S, Chakraborty P, Daenthanasanmak A, Iamsawat S, Andrejeva G, Luevano LA, Wolf M, Baliga U, Krieg C, Beeson CC, Mehrotra M, Hill EG, Rathmell JC, Yu XZ, Kraft AS, Mehrotra S. Targeting PIM Kinase with PD1 Inhibition Improves Immunotherapeutic Antitumor T-cell Response. Clin Cancer Res 2018; 25:1036-1049. [PMID: 30327305 DOI: 10.1158/1078-0432.ccr-18-0706] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2018] [Revised: 06/29/2018] [Accepted: 10/10/2018] [Indexed: 01/01/2023]
Abstract
PURPOSE Adoptive T-cell therapy (ACT) of cancer, which involves the infusion of ex vivo-engineered tumor epitope reactive autologous T cells into the tumor-bearing host, is a potential treatment modality for cancer. However, the durable antitumor response following ACT is hampered either by loss of effector function or survival of the antitumor T cells. Therefore, strategies to improve the persistence and sustain the effector function of the antitumor T cells are of immense importance. Given the role of metabolism in determining the therapeutic efficacy of T cells, we hypothesize that inhibition of PIM kinases, a family of serine/threonine kinase that promote cell-cycle transition, cell growth, and regulate mTORC1 activity, can improve the potency of T cells in controlling tumor. EXPERIMENTAL DESIGN The role of PIM kinases in T cells was studied either by genetic ablation (PIM1-/-PIM2-/-PIM3-/-) or its pharmacologic inhibition (pan-PIM kinase inhibitor, PimKi). Murine melanoma B16 was established subcutaneously and treated by transferring tumor epitope gp100-reactive T cells along with treatment regimen that involved inhibiting PIM kinases, anti-PD1 or both. RESULTS With inhibition of PIM kinases, T cells had significant reduction in their uptake of glucose, and upregulated expression of memory-associated genes that inversely correlate with glycolysis. In addition, the expression of CD38, which negatively regulates the metabolic fitness of the T cells, was also reduced in PimKi-treated cells. Importantly, the efficacy of antitumor T-cell therapy was markedly improved by inhibiting PIM kinases in tumor-bearing mice receiving ACT, and further enhanced by adding anti-PD1 antibody to this combination. CONCLUSIONS This study highlights the potential therapeutic significance of combinatorial strategies where ACT and inhibition of signaling kinase with checkpoint blockade could improve tumor control.
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Affiliation(s)
- Shilpak Chatterjee
- Department of Surgery, Medical University of South Carolina, Charleston, South Carolina
| | - Paramita Chakraborty
- Department of Surgery, Medical University of South Carolina, Charleston, South Carolina
| | - Anusara Daenthanasanmak
- Department of Microbiology & Immunology, Medical University of South Carolina, Charleston, South Carolina
| | - Supinya Iamsawat
- Department of Microbiology & Immunology, Medical University of South Carolina, Charleston, South Carolina
| | - Gabriela Andrejeva
- Department of Pathology, Microbiology and Immunology, Vanderbilt University Medical Center, Nashville, Tennessee
| | - Libia A Luevano
- University of Arizona Cancer Center, University of Arizona, Tucson, Arizona
| | - Melissa Wolf
- Department of Pathology, Microbiology and Immunology, Vanderbilt University Medical Center, Nashville, Tennessee
| | - Uday Baliga
- Department of Pathology & Laboratory Medicine, Medical University of South Carolina, Charleston, South Carolina
| | - Carsten Krieg
- Department of Microbiology & Immunology, Medical University of South Carolina, Charleston, South Carolina
| | - Craig C Beeson
- Department of Pharmaceutical and Biomedical Sciences, Medical University of South Carolina, Charleston, South Carolina
| | - Meenal Mehrotra
- Department of Pathology & Laboratory Medicine, Medical University of South Carolina, Charleston, South Carolina
| | - Elizabeth G Hill
- Department of Public Health, Hollings Cancer Center, Medical University of South Carolina, Charleston, South Carolina
| | - Jeffery C Rathmell
- Department of Pathology, Microbiology and Immunology, Vanderbilt University Medical Center, Nashville, Tennessee
| | - Xue-Zhong Yu
- Department of Microbiology & Immunology, Medical University of South Carolina, Charleston, South Carolina
| | - Andrew S Kraft
- University of Arizona Cancer Center, University of Arizona, Tucson, Arizona
| | - Shikhar Mehrotra
- Department of Surgery, Medical University of South Carolina, Charleston, South Carolina.
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Wilson KR, Kang IH, Baliga U, Xiong Y, Chatterjee S, Moore E, Parthiban B, Thyagarajan K, Borke JL, Mehrotra S, Kirkwood KL, LaRue AC, Ogawa M, Mehrotra M. Hematopoietic Stem Cells as a Novel Source of Dental Tissue Cells. Sci Rep 2018; 8:8026. [PMID: 29795229 PMCID: PMC5966408 DOI: 10.1038/s41598-018-26258-y] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2018] [Accepted: 05/08/2018] [Indexed: 12/19/2022] Open
Abstract
While earlier studies have suggested that cells positive for hematopoietic markers can be found in dental tissues, it has yet to be confirmed. To conclusively demonstrate this, we utilized a unique transgenic model in which all hematopoietic cells are green fluorescent protein+ (GFP+). Pulp, periodontal ligament (PDL) and alveolar bone (AvB) cell culture analysis demonstrated numerous GFP+ cells, which were also CD45+ (indicating hematopoietic origin) and co-expressed markers of cellular populations in pulp (dentin matrix protein-1, dentin sialophosphoprotein, alpha smooth muscle actin [ASMA], osteocalcin), in PDL (periostin, ASMA, vimentin, osteocalcin) and in AvB (Runx-2, bone sialoprotein, alkaline phosphatase, osteocalcin). Transplantation of clonal population derived from a single GFP+ hematopoietic stem cell (HSC), into lethally irradiated recipient mice, demonstrated numerous GFP+ cells within dental tissues of recipient mice, which also stained for markers of cell populations in pulp, PDL and AvB (used above), indicating that transplanted HSCs can differentiate into cells in dental tissues. These hematopoietic-derived cells deposited collagen and can differentiate in osteogenic media, indicating that they are functional. Thus, our studies demonstrate, for the first time, that cells in pulp, PDL and AvB can have a hematopoietic origin, thereby opening new avenues of therapy for dental diseases and injuries.
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Affiliation(s)
- Katie R Wilson
- Department of Pathology and Laboratory Medicine, Medical University of South Carolina, Charleston, SC, 29425, USA
| | - In-Hong Kang
- Department of Pathology and Laboratory Medicine, Medical University of South Carolina, Charleston, SC, 29425, USA
| | - Uday Baliga
- Department of Pathology and Laboratory Medicine, Medical University of South Carolina, Charleston, SC, 29425, USA
| | - Ying Xiong
- Department of Pathology and Laboratory Medicine, Medical University of South Carolina, Charleston, SC, 29425, USA
| | - Shilpak Chatterjee
- Department of Surgery, Medical University of South Carolina, Charleston, SC, 29425, USA
| | - Emily Moore
- Department of Oral Health Sciences, Medical University of South Carolina, Charleston, SC, 29425, USA
| | - Beneta Parthiban
- Department of Surgery, Medical University of South Carolina, Charleston, SC, 29425, USA
| | | | - James L Borke
- College of Dental Medicine, Western University of Health Sciences, Pomona, CA, 91766, USA
| | - Shikhar Mehrotra
- Department of Surgery, Medical University of South Carolina, Charleston, SC, 29425, USA
| | - Keith L Kirkwood
- Department of Oral Biology, University at Buffalo, The State University of New York, Department of Oral Oncology, Roswell Park Comprehensive Cancer Center, Buffalo, NY, 14260, USA
| | - Amanda C LaRue
- Department of Pathology and Laboratory Medicine, Medical University of South Carolina, Charleston, SC, 29425, USA.,Hollings Cancer Center, Medical University of South Carolina, Charleston, SC, 29425, USA.,Ralph H Johnson VA Medical Center, Charleston, SC, 29425, USA
| | - Makio Ogawa
- Department of Pathology and Laboratory Medicine, Medical University of South Carolina, Charleston, SC, 29425, USA
| | - Meenal Mehrotra
- Department of Pathology and Laboratory Medicine, Medical University of South Carolina, Charleston, SC, 29425, USA. .,Department of Oral Health Sciences, Medical University of South Carolina, Charleston, SC, 29425, USA. .,Hollings Cancer Center, Medical University of South Carolina, Charleston, SC, 29425, USA. .,Center for Oral Health Research, Medical University of South Carolina, Charleston, SC, 29425, USA.
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12
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Chatterjee S, Daenthanasanmak A, Chakraborty P, Wyatt MW, Dhar P, Selvam SP, Fu J, Zhang J, Nguyen H, Kang I, Toth K, Al-Homrani M, Husain M, Beeson G, Ball L, Helke K, Husain S, Garrett-Mayer E, Hardiman G, Mehrotra M, Nishimura MI, Beeson CC, Bupp MG, Wu J, Ogretmen B, Paulos CM, Rathmell J, Yu XZ, Mehrotra S. CD38-NAD +Axis Regulates Immunotherapeutic Anti-Tumor T Cell Response. Cell Metab 2018; 27:85-100.e8. [PMID: 29129787 PMCID: PMC5837048 DOI: 10.1016/j.cmet.2017.10.006] [Citation(s) in RCA: 162] [Impact Index Per Article: 27.0] [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] [Received: 12/07/2016] [Revised: 05/02/2017] [Accepted: 10/13/2017] [Indexed: 10/18/2022]
Abstract
Heightened effector function and prolonged persistence, the key attributes of Th1 and Th17 cells, respectively, are key features of potent anti-tumor T cells. Here, we established ex vivo culture conditions to generate hybrid Th1/17 cells, which persisted long-term in vivo while maintaining their effector function. Using transcriptomics and metabolic profiling approaches, we showed that the enhanced anti-tumor property of Th1/17 cells was dependent on the increased NAD+-dependent activity of the histone deacetylase Sirt1. Pharmacological or genetic inhibition of Sirt1 activity impaired the anti-tumor potential of Th1/17 cells. Importantly, T cells with reduced surface expression of the NADase CD38 exhibited intrinsically higher NAD+, enhanced oxidative phosphorylation, higher glutaminolysis, and altered mitochondrial dynamics that vastly improved tumor control. Lastly, blocking CD38 expression improved tumor control even when using Th0 anti-tumor T cells. Thus, strategies targeting the CD38-NAD+ axis could increase the efficacy of anti-tumor adoptive T cell therapy.
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Affiliation(s)
- Shilpak Chatterjee
- Department of Surgery, Hollings Cancer Center, Medical University of South Carolina, Charleston, SC 29425, USA
| | - Anusara Daenthanasanmak
- Department of Microbiology and Immunology, Hollings Cancer Center, Medical University of South Carolina, Charleston, SC 29425, USA
| | - Paramita Chakraborty
- Department of Surgery, Hollings Cancer Center, Medical University of South Carolina, Charleston, SC 29425, USA
| | - Megan W Wyatt
- Department of Microbiology and Immunology, Hollings Cancer Center, Medical University of South Carolina, Charleston, SC 29425, USA
| | - Payal Dhar
- Department of Microbiology and Immunology, Hollings Cancer Center, Medical University of South Carolina, Charleston, SC 29425, USA
| | - Shanmugam Panneer Selvam
- Department of Biochemistry and Molecular Biology, Hollings Cancer Center, Medical University of South Carolina, Charleston, SC 29425, USA
| | - Jianing Fu
- Department of Microbiology and Immunology, Hollings Cancer Center, Medical University of South Carolina, Charleston, SC 29425, USA
| | - Jinyu Zhang
- Department of Microbiology and Immunology, Hollings Cancer Center, Medical University of South Carolina, Charleston, SC 29425, USA
| | - Hung Nguyen
- Department of Microbiology and Immunology, Hollings Cancer Center, Medical University of South Carolina, Charleston, SC 29425, USA
| | - Inhong Kang
- Department of Pathology and Laboratory Medicine, Hollings Cancer Center, Medical University of South Carolina, Charleston, SC 29425, USA
| | - Kyle Toth
- Department of Surgery, Hollings Cancer Center, Medical University of South Carolina, Charleston, SC 29425, USA
| | - Mazen Al-Homrani
- Department of Surgery, Hollings Cancer Center, Medical University of South Carolina, Charleston, SC 29425, USA
| | - Mahvash Husain
- Department of Surgery, Hollings Cancer Center, Medical University of South Carolina, Charleston, SC 29425, USA
| | - Gyda Beeson
- Department of Pharmaceutical and Biomedical Sciences, Hollings Cancer Center, Medical University of South Carolina, Charleston, SC 29425, USA
| | - Lauren Ball
- Department of Pharmaceutical and Biomedical Sciences, Hollings Cancer Center, Medical University of South Carolina, Charleston, SC 29425, USA
| | - Kristi Helke
- Department of Pathology and Laboratory Medicine, Hollings Cancer Center, Medical University of South Carolina, Charleston, SC 29425, USA
| | - Shahid Husain
- Department of Ophthalmology, Hollings Cancer Center, Medical University of South Carolina, Charleston, SC 29425, USA
| | - Elizabeth Garrett-Mayer
- Department of Public Health, Hollings Cancer Center, Medical University of South Carolina, Charleston, SC 29425, USA
| | - Gary Hardiman
- Department of Nephrology, Hollings Cancer Center, Medical University of South Carolina, Charleston, SC 29425, USA
| | - Meenal Mehrotra
- Department of Pathology and Laboratory Medicine, Hollings Cancer Center, Medical University of South Carolina, Charleston, SC 29425, USA
| | | | - Craig C Beeson
- Department of Pharmaceutical and Biomedical Sciences, Hollings Cancer Center, Medical University of South Carolina, Charleston, SC 29425, USA
| | | | - Jennifer Wu
- Department of Microbiology and Immunology, Hollings Cancer Center, Medical University of South Carolina, Charleston, SC 29425, USA
| | - Besim Ogretmen
- Department of Biochemistry and Molecular Biology, Hollings Cancer Center, Medical University of South Carolina, Charleston, SC 29425, USA
| | - Chrystal M Paulos
- Department of Microbiology and Immunology, Hollings Cancer Center, Medical University of South Carolina, Charleston, SC 29425, USA
| | - Jeffery Rathmell
- Department of Pathology, Microbiology, and Immunology, Vanderbilt University, Nashville, TN 37232, USA
| | - Xue-Zhong Yu
- Department of Microbiology and Immunology, Hollings Cancer Center, Medical University of South Carolina, Charleston, SC 29425, USA
| | - Shikhar Mehrotra
- Department of Surgery, Hollings Cancer Center, Medical University of South Carolina, Charleston, SC 29425, USA.
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13
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Mehrotra M, Li XZ, Ireland MJ. Enhancing antimicrobial stewardship by strengthening the veterinary drug regulatory framework. Can Commun Dis Rep 2017; 43:220-223. [PMID: 29770050 PMCID: PMC5764736 DOI: 10.14745/ccdr.v43i11a02] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Antimicrobial resistance is a major and growing public health threat. Recently, Health Canada introduced multiple regulatory changes to strengthen the oversight of antimicrobial drugs for veterinary use. These changes aim specifically at increasing control over importation of veterinary drugs and active pharmaceutical ingredients, mandatory reporting of antimicrobial sales data from manufacturers, importers and compounders and facilitating access to low risk veterinary health products. Additional policy changes under existing authorities are also being made to enhance veterinary supervision of antimicrobial use and to remove production claims for food animals from labels of medically important antimicrobial drugs. These important interlinked initiatives are aimed towards enhancing antimicrobial stewardship in Canada to preserve the effectiveness of existing antimicrobials and to protect the health of Canadians.
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Affiliation(s)
- M Mehrotra
- Veterinary Drugs Directorate, Health Products and Food Branch, Health Canada, Ottawa, ON
| | - X-Z Li
- Veterinary Drugs Directorate, Health Products and Food Branch, Health Canada, Ottawa, ON
| | - MJ Ireland
- Veterinary Drugs Directorate, Health Products and Food Branch, Health Canada, Ottawa, ON
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14
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Agarwal J, Hasan A, Mehrotra M. Hepatobiliary and Pancreatic: Hepatogastric fistula. J Gastroenterol Hepatol 2017. [PMID: 28639267 DOI: 10.1111/jgh.13794] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/09/2022]
Affiliation(s)
| | - A Hasan
- Regency Health Care, Kanpur, India
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15
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Mehrotra M, Sonkar A, Anand A, Husain N. To evaluate P-glycoprotein expression in relation to molecular subtypes and predicting response to neoadjuvant chemotherapy in breast cancer – a study from a tertiary care center in India. Eur J Cancer 2017. [DOI: 10.1016/s0959-8049(17)30156-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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17
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Xiong Y, McDonald LT, Russell DL, Kelly RR, Wilson KR, Mehrotra M, Soloff AC, LaRue AC. Hematopoietic stem cell-derived adipocytes and fibroblasts in the tumor microenvironment. World J Stem Cells 2015; 7:253-265. [PMID: 25815113 PMCID: PMC4369485 DOI: 10.4252/wjsc.v7.i2.253] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/29/2014] [Revised: 11/08/2014] [Accepted: 12/01/2014] [Indexed: 02/06/2023] Open
Abstract
The tumor microenvironment (TME) is complex and constantly evolving. This is due, in part, to the crosstalk between tumor cells and the multiple cell types that comprise the TME, which results in a heterogeneous population of tumor cells and TME cells. This review will focus on two stromal cell types, the cancer-associated adipocyte (CAA) and the cancer-associated fibroblast (CAF). In the clinic, the presence of CAAs and CAFs in the TME translates to poor prognosis in multiple tumor types. CAAs and CAFs have an activated phenotype and produce growth factors, inflammatory factors, cytokines, chemokines, extracellular matrix components, and proteases in an accelerated and aberrant fashion. Through this activated state, CAAs and CAFs remodel the TME, thereby driving all aspects of tumor progression, including tumor growth and survival, chemoresistance, tumor vascularization, tumor invasion, and tumor cell metastasis. Similarities in the tumor-promoting functions of CAAs and CAFs suggest that a multipronged therapeutic approach may be necessary to achieve maximal impact on disease. While CAAs and CAFs are thought to arise from tissues adjacent to the tumor, multiple alternative origins for CAAs and CAFs have recently been identified. Recent studies from our lab and others suggest that the hematopoietic stem cell, through the myeloid lineage, may serve as a progenitor for CAAs and CAFs. We hypothesize that the multiple origins of CAAs and CAFs may contribute to the heterogeneity seen in the TME. Thus, a better understanding of the origin of CAAs and CAFs, how this origin impacts their functions in the TME, and the temporal participation of uniquely originating TME cells may lead to novel or improved anti-tumor therapeutics.
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Ogawa M, LaRue AC, Mehrotra M. Hematopoietic stem cells are pluripotent and not just "hematopoietic". Blood Cells Mol Dis 2013; 51:3-8. [PMID: 23453528 DOI: 10.1016/j.bcmd.2013.01.008] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2013] [Accepted: 01/16/2013] [Indexed: 12/11/2022]
Abstract
Over a decade ago, several preclinical transplantation studies suggested the striking concept of the tissue-reconstituting ability (often referred to as HSC plasticity) of hematopoietic stem cells (HSCs). While this heralded an exciting time of radically new therapies for disorders of many organs and tissues, the concept was soon mired in controversy and remained dormant for almost a decade. This commentary provides a concise review of evidence for HSC plasticity, including more recent findings based on single HSC transplantation in mouse and clinical transplantation studies. There is strong evidence for the concept that HSCs are pluripotent and are the source for the majority, if not all, of the cell types in our body. Also discussed are some biological and experimental issues that need to be considered in the future investigation of HSC plasticity.
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Affiliation(s)
- Makio Ogawa
- Department of Pathology and Laboratory Medicine, Ralph H. Johnson VAMC, USA.
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19
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Mehrotra M, Williams CR, Ogawa M, LaRue AC. Hematopoietic stem cells give rise to osteo-chondrogenic cells. Blood Cells Mol Dis 2012; 50:41-9. [PMID: 22954476 DOI: 10.1016/j.bcmd.2012.08.003] [Citation(s) in RCA: 18] [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] [Subscribe] [Scholar Register] [Received: 07/22/2012] [Revised: 08/08/2012] [Accepted: 08/08/2012] [Indexed: 12/15/2022]
Abstract
Repair of bone fracture requires recruitment and proliferation of stem cells with the capacity to differentiate to functional osteoblasts. Given the close association of bone and bone marrow (BM), it has been suggested that BM may serve as a source of these progenitors. To test the ability of hematopoietic stem cells (HSCs) to give rise to osteo-chondrogenic cells, we used a single HSC transplantation paradigm in uninjured bone and in conjunction with a tibial fracture model. Mice were lethally irradiated and transplanted with a clonal population of cells derived from a single enhanced green fluorescent protein positive (eGFP+) HSC. Analysis of paraffin sections from these animals showed the presence of eGFP+ osteocytes and hypertrophic chondrocytes. To determine the contribution of HSC-derived cells to fracture repair, non-stabilized tibial fracture was created. Paraffin sections were examined at 7 days, 2 weeks and 2 months after fracture and eGFP+ hypertrophic chondrocytes, osteoblasts and osteocytes were identified at the callus site. These cells stained positive for Runx-2 or osteocalcin and also stained for eGFP demonstrating their origin from the HSC. Together, these findings strongly support the concept that HSCs generate bone cells and suggest therapeutic potentials of HSCs in fracture repair.
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Affiliation(s)
- Meenal Mehrotra
- Department of Veterans Affairs Medical Center, Ralph H. Johnson VAMC, Medical University of South Carolina, Charleston, SC, USA
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20
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Sharma A, Mehrotra M, Khullar R, Soni V, Baijal M, Chowbey PK. Laparoscopic ventral/incisional hernia repair: a single centre experience of 1,242 patients over a period of 13 years. Hernia 2010; 15:131-9. [PMID: 21082208 DOI: 10.1007/s10029-010-0747-z] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.0] [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: 03/26/2010] [Accepted: 10/22/2010] [Indexed: 10/18/2022]
Abstract
BACKGROUND AND PURPOSE Laparoscopic technique is now well established for ventral/incisional hernia repair. However several issues such as optimal fixation technique, occult hernias, management of inadvertent enterotomies, postoperative seromas and recurrence require appraisal. METHODS A single centre retrospective review of 1,242 patients between January 1992 and June 2005 is described. All patients had laparoscopic ventral/incisional hernia repair (LVIHR) following a standardised protocol by five consultants and fellows in a dedicated minimal access surgery unit of a tertiary care hospital. RESULTS LVIHR was completed in 1,223 patients (98.5%). The average BMI was 32, mean defect size was 26.2 cm(2), mean operating time was 81 min and mean hospital stay was 1.9 days. The mean mesh to hernia ratio was 37.5. Occult hernias were observed in 203 (16.3%) patients and inadvertent enterotomies occurred in 21 (1.7%) patients. Mortality occurred in two patients, pulmonary embolism and cardiac dysrhythmia being the respective reasons. The most common sequel was early seroma formation (25%). Chronic pain occurred in 14.7% patients. Recurrence rate was 4.4%, which was associated with a higher BMI, use of staplers as fixation device, multiple defects and recurrent hernias. The mean follow up was 5.4 years; (range 2.4-10 years). The follow up rate was 78%. CONCLUSION LVIHR leads to low recurrence rates and low rates of wound and mesh infection. Occult hernias are diagnosed and optimally treated laparoscopically. However, chronic pain remains an unresolved issue.
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Affiliation(s)
- A Sharma
- Max Institute of Minimal Access, Metabolic and Bariatric Surgery, A unit of Devki Devi Foundation, Max Super Speciality Hospital, East Block, 2, Press Enclave Road, Saket, New Delhi, 110 017, India.
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Mehrotra M, Rosol M, Ogawa M, Larue AC. Amelioration of a mouse model of osteogenesis imperfecta with hematopoietic stem cell transplantation: microcomputed tomography studies. Exp Hematol 2010; 38:593-602. [PMID: 20417683 DOI: 10.1016/j.exphem.2010.04.008] [Citation(s) in RCA: 28] [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] [Subscribe] [Scholar Register] [Received: 04/14/2010] [Revised: 04/14/2010] [Accepted: 04/16/2010] [Indexed: 12/13/2022]
Abstract
OBJECTIVE To test the hypothesis that hematopoietic stem cells (HSCs) generate bone cells using bone marrow (BM) cell transplantation in a mouse model of osteogenesis imperfecta (OI). OI is a genetic disorder resulting from abnormal amount and/or structure of type I collagen and is characterized by osteopenia, fragile bones, and skeletal deformities. Homozygous OI murine mice (oim; B6C3Fe a/a-Col1a2(oim)/J) offer excellent recipients for transplantation of normal HSCs, because fast turnover of osteoprogenitors has been shown. MATERIALS AND METHODS We transplanted BM mononuclear cells or 50 BM cells highly enriched for HSCs from transgenic enhanced green fluorescent protein mice into irradiated oim mice and analyzed changes in bone parameters using longitudinal microcomputed tomography. RESULTS Dramatic improvements were observed in three-dimensional microcomputed tomography images of these bones 3 to 6 months post-transplantation when the mice showed high levels of hematopoietic engraftment. Histomorphometric assessment of the bone parameters, such as trabecular structure and cortical width, supported observations from three-dimensional images. There was an increase in bone volume, trabecular number, and trabecular thickness with a concomitant decrease in trabecular spacing. Analysis of a nonengrafted mouse or a mouse that was transplanted with BM cells from oim mice showed continued deterioration in the bone parameters. The engrafted mice gained weight and became less prone to spontaneous fractures while the control mice worsened clinically and eventually developed kyphosis. CONCLUSIONS These findings strongly support the concept that HSCs generate bone cells. Furthermore, they are consistent with observations from clinical transplantation studies and suggest therapeutic potentials of HSCs in OI.
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Affiliation(s)
- Meenal Mehrotra
- Research Services, Department of Veterans Affairs Medical Center, Charleston, SC 29401-5799, USA
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22
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Abangan RS, Williams CR, Mehrotra M, Duncan JD, Larue AC. MCP1 directs trafficking of hematopoietic stem cell-derived fibroblast precursors in solid tumor. Am J Pathol 2010; 176:1914-26. [PMID: 20167869 DOI: 10.2353/ajpath.2010.080839] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Our previous studies have demonstrated that hematopoietic stem cells (HSCs) are a novel source of carcinoma-associated fibroblasts. However, the mechanisms regulating recruitment and homing of HSC-derived carcinoma-associated fibroblasts or their precursors to the tumor microenvironment are unknown. Herein, we demonstrate using a single cell transplantation model that circulating fibroblast precursors (CFPs) are of HSC origin. This population increased with tumor burden in vivo and functional in vitro studies showed that CFPs preferentially migrated and differentiated into fibroblasts in response to tumor, suggesting that HSC-derived CFPs serve as an intermediate between the bone marrow and tumor. Based on this chemotactic ability and our demonstration of a monocyte lineage origin for CFPs, we investigated the role of monocyte chemoattractant protein (MCP1) in mediating CFP recruitment/homing. Blocking tumor-produced MCP1 inhibited in vitro migration of CFPs in response to multiple tumor types, indicating broad biological significance for this CFP/chemokine interaction. In vivo, CCR2-expressing CFPs increased in circulation during the period of active tumor growth and stromal development. Inhibition of MCP1 during tumor development resulted in decreased tumor volume in tumor-bearing mice. Together these findings confirm an HSC origin for CFPs, demonstrate a role for MCP1 in regulating their contribution to the tumor microenvironment, and suggest a potential therapeutic target for limiting tumor growth.
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Affiliation(s)
- Romeo S Abangan
- Ralph H. Johnson VA Medical Center, Charleston, SC 29401, USA
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Shirai K, Sera Y, Bulkeley W, Mehrotra M, Moussa O, LaRue AC, Watson DK, Stuart RK, Lazarchick J, Ogawa M. Hematopoietic stem cell origin of human fibroblasts: cell culture studies of female recipients of gender-mismatched stem cell transplantation and patients with chronic myelogenous leukemia. Exp Hematol 2009; 37:1464-71. [PMID: 19786066 DOI: 10.1016/j.exphem.2009.09.008] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2009] [Revised: 09/23/2009] [Accepted: 09/23/2009] [Indexed: 12/20/2022]
Abstract
OBJECTIVE Our series of studies using transplantation of single hematopoietic stem cells (HSCs) demonstrated that mouse fibroblasts/myofibroblasts are derived from HSCs. In order to determine the origin of human fibroblasts, we established a method for culturing fibroblasts from human peripheral blood (PB) mononuclear cells and studied fibroblasts from gender-mismatched HSC transplant recipients and patients with untreated Philadelphia chromosome-positive chronic myelogenous leukemia (CML). MATERIALS AND METHODS We cultured PB cells from three female subjects who showed near-complete hematopoietic reconstitution from transplantation of granulocyte-colony stimulating factor-mobilized male PB cells and examined the resulting fibroblasts using fluorescent in situ hybridization for Y chromosome. Because the mobilized PB cells may contain mesenchymal stem cells, we could not determine the HSC or mesenchymal stem cell origin of the fibroblasts seen in culture. To further document the HSC origin of human fibroblasts, we next examined fibroblasts from two patients with untreated CML, a known clonal disorder of HSCs. RESULTS All cultured fibroblasts from female recipients of male cells showed the presence of Y chromosome, indicating the donor origin of fibroblasts. Cultured fibroblasts from the CML patients revealed the presence of BCR-ABL translocation. This demonstration provided strong evidence for the HSC origin of human fibroblasts because CML is a clonal disorder of the HSC. CONCLUSIONS These studies strongly suggest that human fibroblasts are derived from HSCs. In addition, the results suggest that fibrosis seen in patients with CML may be a part of the clonal process.
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Affiliation(s)
- Keisuke Shirai
- Department of Medicine, Medical University of South Carolina, Charleston, SC, USA
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Norell H, Martins da Palma T, Lesher A, Kaur N, Mehrotra M, Naga OS, Spivey N, Olafimihan S, Chakraborty NG, Voelkel-Johnson C, Nishimura MI, Mukherji B, Mehrotra S. Inhibition of superoxide generation upon T-cell receptor engagement rescues Mart-1(27-35)-reactive T cells from activation-induced cell death. Cancer Res 2009; 69:6282-9. [PMID: 19638595 DOI: 10.1158/0008-5472.can-09-1176] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Cytotoxic T lymphocytes (CTL) may undergo massive expansion upon appropriate antigenic stimulation. Homeostasis is maintained by a subsequent "contraction" of these cells. Activation-induced cell death (AICD) and programmed cell death prevent the untoward side effects, arising from excessive numbers and prolonged persistence of activated CTL, that occur upon uncontrolled and/or continued expansion. However, effector cell persistence has been identified as a hallmark of successful T-cell-mediated adoptive immunotherapy. Thus, prevention of AICD may be critical to achieve more successful clinical results. We have previously shown that treatment with the c-Jun NH(2)-terminal kinase (JNK) inhibitor SP600125 protects human melanoma epitope Mart-1(27-35)-reactive CTL from apoptotic death upon their reencounter with cognate antigen. However, inhibition of JNK also interferes with the functional ability of the CTL to secrete IFN-gamma. Here, we show that reactive oxygen species (ROS) inhibitors, such as the superoxide dismutase mimetic Mn (III) tetrakis (5, 10, 15, 20-benzoic acid) porphyrin (MnTBAP), efficiently protected Mart-1(27-35)-reactive primary CTL from AICD without impairing their functional capability. MnTBAP prevented the increase in intracellular ROS, mitochondrial membrane collapse, and DNA fragmentation observed in control-treated cells upon cognate antigen encounter. Furthermore, the mechanism of AICD prevention in primary CTL included blockade of JNK activation. Finally, tumor-reactive in vitro expanded tumor infiltrating lymphocytes, which are used clinically in cancer immunotherapy, also benefit from MnTBAP-mediated antioxidant treatment. Thus, modulation of the redox pathway might improve CTL persistence and lead to better clinical results for T cell-based immunotherapies.
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Affiliation(s)
- Håkan Norell
- Departments of Surgery, Microbiology and Immunology, and Pathology, Medical University of South Carolina, Charleston, South Carolina 29425, USA
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Sera Y, LaRue AC, Moussa O, Mehrotra M, Duncan JD, Williams CR, Nishimoto E, Schulte BA, Watson PM, Watson DK, Ogawa M. Hematopoietic stem cell origin of adipocytes. Exp Hematol 2009; 37:1108-20, 1120.e1-4. [PMID: 19576951 DOI: 10.1016/j.exphem.2009.06.008] [Citation(s) in RCA: 75] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2009] [Accepted: 06/26/2009] [Indexed: 12/20/2022]
Abstract
OBJECTIVE It has generally been believed that adipocytes are derived from mesenchymal stem cells via fibroblasts. We recently reported that fibroblasts/myofibroblasts in a number of tissues and organs are derived from hematopoietic stem cells (HSCs). In the present study, we tested the hypothesis that HSCs also give rise to adipocytes. MATERIALS AND METHODS Using transplantation of a single enhanced green fluorescent protein-positive (EGFP(+)) HSC and primary culture, we examined generation of adipocytes from HSCs. RESULTS Adipose tissues from clonally engrafted mice showed EGFP(+) adipocytes that stained positive for leptin, perilipin, and fatty acid binding protein 4. A diet containing rosiglitazone, a peroxisome proliferator-activated receptor-gamma agonist, significantly enhanced the number of EGFP(+) adipocytes. When EGFP(+) bone marrow cells from clonally engrafted mice were cultured under adipogenic conditions, all of the cultured cells stained positive with Oil Red O and Sudan Black B and exhibited the presence of abundant mRNA for adipocyte markers. Finally, clonal culture- and sorting-based studies of Mac-1 expression of hematopoietic progenitors suggested that adipocytes are derived from HSCs via progenitors for monocytes/macrophages. CONCLUSION Together, these studies clarify the current controversy regarding the ability of HSCs to give rise to adipocytes. Furthermore, our primary culture method that generates adipocytes from uncommitted hematopoietic cells should contribute to the studies of the mechanisms of early adipocytic differentiation and may lead to development of therapeutic solutions for many general obesity issues.
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Affiliation(s)
- Yasuhiko Sera
- Department of Pathology and Laboratory Medicine, Medical University of South Carolina, Charleston, SC 29401, USA
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Kaneko H, Mehrotra M, Alander C, Lerner U, Pilbeam C, Raisz L. Effects of prostaglandin E2 and lipopolysaccharide on osteoclastogenesis in RAW 264.7 cells. Prostaglandins Leukot Essent Fatty Acids 2007; 77:181-6. [PMID: 17951042 PMCID: PMC2836877 DOI: 10.1016/j.plefa.2007.09.002] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/29/2007] [Accepted: 09/14/2007] [Indexed: 10/22/2022]
Abstract
INTRODUCTION Prostaglandins (PGs) can act on both hematopoietic and osteoblastic lineages to enhance osteoclast formation. METHODS We examined PGE2 stimulated osteoclastogenesis in RAW 264.7 cells and the role of endogenous PGE2 in lipopolysaccharide (LPS) stimulated osteoclastogenesis. RESULTS RANKL (1-100 ng/ml) increased formation of osteoclasts, defined as tartrate resistant acid phosphatase multinucleated cells, with peak effects at 30 ng/ml. Addition of PGE2 (0.01-1.0 microM) to RANKL (30 ng/ml) dose dependently increased osteoclast number 30-150%. Use of NS-398 (0.1 microM) or indomethacin (Indo, 1.0 micro M) to block endogenous PG synthesis had little effect on the response to RANKL alone but significantly decreased the response to PGE2. Addition of LPS (100 ng/ml) to RANKL increased osteoclast number 50%, and this response was significantly decreased by NS-398 and Indo. RANKL and PGE2 produced small, additive increases in COX-2 mRNA levels, while LPS produced a larger increase. PG release into the medium was not increased by RANKL and PGE2 but markedly increased by LPS. CONCLUSION We conclude that RANKL stimulated osteoclastogenesis can be enhanced by PGE2 and LPS though direct effects on the hematopoietic cell lineage and that these effects may be mediated in part by induction of COX-2 and enhanced intracellular PG production.
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Affiliation(s)
- H Kaneko
- Musculoskeletal Institute, University of Connecticut Health Center, 263 Farmington Avenue, Farmington, CT 06030, USA
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Gupta R, Pandey P, Choudhry R, Kashyap R, Mehrotra M, Naseem S, Nityanand S. A prospective comparison of four techniques for diagnosis of paroxysmal nocturnal hemoglobinuria. Int J Lab Hematol 2007; 29:119-26. [PMID: 17474884 DOI: 10.1111/j.1751-553x.2006.00838.x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [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: 10/23/2022]
Abstract
Paroxysmal nocturnal hemoglobinuria (PNH) is an acquired clonal stem cell disorder with altered expression of glycosylphosphatidylinositol (GPI)-anchored proteins, resulting in the increased susceptibility of erythrocytes to complement-mediated lysis. This study compared the available laboratory methods for detection of PNH cells and evaluated their utility in routine clinical practice. Fifty patients were evaluated by flow cytometric immunophenotyping (FCMI) using CD55 and CD59 monoclonal antibodies, PNH gel card test (GCT), Ham test and sucrose lysis test (SLT). A PNH clone was detectable in erythrocytes in 14 (28%) patients by FCMI, 13 (26%) by GCT and 10 (20%) by Ham test and SLT. The GCT and lytic tests showed 100% specificity and sensitivity was 92.8% and 71.1%, respectively. The GCT results correlated with type III cells (positive for > or =3.21% type III cells) and lytic test results correlated with CD59(-) type III cells (positive for > or =5% CD59(-) type III cells). The GCT and lytic tests were comparable in their sensitivity to detect type II cells (positive for > or =18.5% type II cells). Among the available methods, FCMI is most sensitive, can quantify and delineate PNH cells with differential expression of GPI-anchored proteins. The GCT is a useful screening tool as it is fairly sensitive, easy to perform and interpret. Well-standardized lytic tests are fairly reliable as screening tests.
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Affiliation(s)
- R Gupta
- Department of Hematology, Sanjay Gandhi Postgraduate Institute of Medical Sciences, Lucknow, India.
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28
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Mehrotra M, Gupta SK, Kumar K, Awasthi PK, Dubey M, Pandey CM, Godbole MM. Calcium deficiency-induced secondary hyperparathyroidism and osteopenia are rapidly reversible with calcium supplementation in growing rabbit pups. Br J Nutr 2007; 95:582-90. [PMID: 16512945 DOI: 10.1079/bjn20051656] [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] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
The reversibility of osteopenia secondary to isolated Ca deficiency (CaDef) is still not clear. We studied the effect of severe CaDef on Ca homeostasis and bone accrual in a ‘hypercalcaemic’ animal, the rabbit, during the post-weaning period and its reversibility on Ca supplementation. Male Belgian 5-week-old rabbit pups were fed CaDef diet (0·026% Ca) for 10 weeks. As compared with those fed with a normal chow diet (0·45% Ca), CaDef pups developed significant hypocalcaemia (P<0·05), hypocalciuria (urinary Ca 76 (sem 12) V 17 (sem 1) mg/l;P<0·005), hypophosphataemia (serum inorganic P 100 (sem 6) V. 65 (sem 4) mg/l; P<0·005), secondary hyperparathyroidism (SHPT) (serum intact parathyroid hormone human equivalent 18·2 (sem 1·4) V. 125·0 (sem 4·5) pg/ml; P<0·001) and elevated serum calcitriol levels (34·0 (sem 3·9) V. 91·0 (sem 1·0) pg/ml; v<0·005). Elevated urinary C-terminal telopeptide of class I collagen (P<0·005) and total serum alkaline phosphatase (P<0·005) suggested increased bone turnover. There was a significantly lower gain in bone mineral density (BMD) and bone mineral content (BMC) in the whole body and lumbar spine in vivo, and various sub-regions of the femur and tibia in vitro.Supplementation of adequate Ca (0·45% Ca) after 15 weeks on the normal diet resulted in rapid catch-up growth, and resolution of SHPT. Rapid gain in various BMD and BMC parameters continued at 30 weeks of age, and both were comparable with those in rabbits on a normal diet. We conclude that Ca deficiency-induced SHPT and poor bone accrual in growing rabbit pups are rapidly reversible with Ca supplementation. The present study indicates that early intervention may be a more appropriate window period for human nutritional corrective measures.
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Affiliation(s)
- Meenal Mehrotra
- Department of Medical Endocrinology, Centre for Endocrine Sciences, Sanjay Gandhi Post Graduate Institute of Medical Sciences, Lucknow, India
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Chauhan A, Mehrotra M, Bhatia PK, Baj B, Gupta AK. Day care laparoscopic cholecystectomy: a feasibility study in a public health service hospital in a developing country. World J Surg 2006; 30:1690-5; discussion 1696-7. [PMID: 16902738 DOI: 10.1007/s00268-006-0023-7] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [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: 12/16/2022]
Abstract
BACKGROUND Day care laparoscopic cholecystectomy (DCLC) has been shown to be safe in centers with adequate infrastructure for day care surgery in economically advanced countries. However, the feasibility of applying this concept in public health service hospitals in less developed and developing nation needs to studied. Unique protocols need to be developed and tested, taking into account local conditions and infrastructural constraints. PATIENTS AND METHODS Patients less than 60 years old, graded I and II on the American Society of Anesthesiologists (ASA) physical status score, living within one hour traveling time and willing to make their own arrangements for a return to hospital in case of problems, were selected for DCLC. RESULTS 291 cases (78%) out of 373 laparoscopic cholecystectomies done in one calendar year were found suitable for DCLC. The most common cause for omitting from DCLC was that the patient lived out of the defined area (57%). Four of 291 (1.3%) cases were cancelled due to medical condition; 270/287 (96.1%) were discharged the same evening as surgery; 6 patients were converted to open surgery; and 11 did not meet the necessary discharge criteria. Eight of 270 (2.9%) required readmission out of which 3 (1.1%) required intervention. Overall, incidence of complication rate was 3.4%. Analysis of data showed that results were comparable to previously published studies, hence extrapolating that inclusion and discharge criteria used in the study are valid. However, there are certain social constraints which hinder truly universal application of DCLC. CONCLUSIONS DCLC is a safe and technically feasible concept, even in public health service centers without dedicated ambulatory surgery units. It has potential for much economical and social benefit in these countries.
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Affiliation(s)
- A Chauhan
- Department of Surgery, Base Hospital, Delhi Cantt, Delhi 110010, India.
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Mehrotra M, Saegusa M, Wadhwa S, Voznesensky O, Peterson D, Pilbeam C. Fluid flow induces Rankl expression in primary murine calvarial osteoblasts. J Cell Biochem 2006; 98:1271-83. [PMID: 16514640 DOI: 10.1002/jcb.20864] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Mechanical loading of bone generates fluid flow within the mineralized matrix that exerts fluid shear stress (FSS) on cells. We examined effects of FSS on receptor activator of nuclear factor kappa B ligand (RANKL), a critical factor for osteoclast formation. Primary murine osteoblasts were subjected to pulsatile FSS (5 Hz, 10 dynes/cm(2)) for 1 h and then returned to static culture for varying times (post-FSS). Protein levels were measured by Western analysis and mRNA by Northern analysis, RT-PCR and quantitative PCR. There were 20- to 40-fold increases in RANKL mRNA at 2-4 h post-FSS. RANKL protein was induced by 2 h post-FSS and remained elevated for at least 8 h. Effects were independent of cyclooxygenase-2 activity. Small increases (up to three-fold) in mRNA of the decoy receptor for RANKL, osteoprotegerin, were seen. Five min of FSS, followed by static culture, was as effective in stimulating RANKL mRNA as 4 h of continuous FSS. FSS induced cAMP activity, and H-89, a protein kinase A (PKA) inhibitor, blocked the FSS induction of RANKL. H-89 also inhibited the PKC pathway, but specific PKC inhibitors, GF109203X and Go6983, did not inhibit FSS-induced RANKL. FSS induced phosphorylation of ERK1/2, and PD98059, an inhibitor of the ERK pathway, inhibited the FSS induction of RANKL mRNA 60%-90%. Thus, brief exposure to FSS resulted in sustained induction of RANKL expression after stopping FSS, and this induction was dependent on PKA and ERK signaling pathways. Increased RANKL after mechanical loading may play a role in initiating bone remodeling.
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Affiliation(s)
- Meenal Mehrotra
- Department of Medicine, University of Connecticut Health Center, 263 Farmington Avenue, Farmington, CT 06030, USA
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Xu Z, Choudhary S, Voznesensky O, Mehrotra M, Woodard M, Hansen M, Herschman H, Pilbeam C. Overexpression of Cox-2 in Human Osteosarcoma Cells Decreases Proliferation and Increases Apoptosis. Cancer Res 2006; 66:6657-64. [PMID: 16818639 DOI: 10.1158/0008-5472.can-05-3624] [Citation(s) in RCA: 62] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Overexpression of cyclooxygenase-2 (COX-2) is generally considered to promote tumorigenesis. To investigate a potential role of COX-2 in osteosarcoma, we overexpressed COX-2 in human osteosarcoma cells. Saos-2 cells deficient in COX-2 expression were retrovirally transduced or stably transfected with murine COX-2 cDNA. Functional expression of COX-2 was confirmed by Northern and Western analyses and prostaglandin production. Overexpression of COX-2 reduced cell numbers by 50% to 70% compared with controls. Decreased proliferation in COX-2-overexpressing cells was associated with cell cycle prolongation in G(2)-M. Apoptosis, measured by both Annexin V binding assay and terminal deoxyribonucleotidyl transferase-mediated dUTP nick end labeling staining, was increased in cells overexpressing COX-2, and the increase was not reversed by treatment with NS-398, indicating that the effects were not mediated by prostaglandins. Retroviral COX-2 overexpression in two other human osteosarcoma cell lines, U2OS and TE85, also decreased cell viability. However, in the human colon carcinoma HCT-116 cell line, which is deficient in COX-2, retroviral overexpression of COX-2, at similar efficiency as in Saos-2 cells, increased resistance to apoptosis. Reactive oxygen species (ROS), measured by flow cytometry, were increased by COX-2 overexpression in Saos-2 cells but not in HCT-116 cells. Inhibition of peroxidase activity, but not of COX activity, blocked the ROS increase. Antioxidants blocked the increase in ROS and the increase in apoptosis due to COX-2 overexpression in Saos-2 cells. Our results suggest that (a) COX-2 overexpression in osteosarcoma cells may increase resistance to tumorigenesis by increasing ROS to levels that decrease cell viability and (b) the effects of COX-2 overexpression are cell type/tissue dependent.
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Affiliation(s)
- Zheng Xu
- Department of Medicine, University of Connecticut Health Center, 263 Farmington Avenue, Farmington, CT 06030, USA
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Abilez O, Benharash P, Mehrotra M, Miyamoto E, Picquet J, Xu C, Zarins C. A new culture system shows that stem cells can be grown in 3-D and under physiologic pulsatile conditions for tissue engineering of vascular grafts. J Surg Res 2006. [DOI: 10.1016/j.jss.2005.11.298] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Mehrotra M, Saegusa M, Voznesensky O, Pilbeam C. Role of Cbfa1/Runx2 in the fluid shear stress induction of COX-2 in osteoblasts. Biochem Biophys Res Commun 2006; 341:1225-30. [PMID: 16476583 DOI: 10.1016/j.bbrc.2006.01.084] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2006] [Accepted: 01/20/2006] [Indexed: 10/25/2022]
Abstract
Induction of cyclooxygenase-2 (COX-2) is thought to be important for the anabolic effects of mechanical loading. The transcription factor Cbfa1/Runx2 is essential for osteoblastic differentiation. We examined the role of Cbfa1 in the fluid shear stress (FSS) induction of COX-2 in MC3T3-E1 cells stably transfected with a COX-2 promoter-luciferase reporter. Cells were subjected to FSS for 30 min and returned to static culture (post-FSS). COX-2 mRNA and promoter activity peaked 0.5-1h and 2-3h, respectively, post-FSS. Mutation of the Cbfa1 consensus sequence at -267/-261 bp decreased the FSS fold-induction of luciferase activity by 50%. On electrophoretic mobility shift assay (EMSA), proteins binding to an oligonucleotide spanning the Cbfa1 site were supershifted by specific antibody to Cbfa1. FSS did not increase Cbfa1 binding on EMSA or Cbfa1 mRNA or protein levels. These data suggest that transcriptional activity of Cbfa1, independent of its level of expression, is necessary for maximal FSS induction of COX-2 in osteoblasts.
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Affiliation(s)
- Meenal Mehrotra
- Department of Medicine, University of Connecticut Health Center, Farmington, CT 06030, USA
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Mehrotra M, Krane SM, Walters K, Pilbeam C. Differential regulation of platelet-derived growth factor stimulated migration and proliferation in osteoblastic cells. J Cell Biochem 2005; 93:741-52. [PMID: 15660418 DOI: 10.1002/jcb.20138] [Citation(s) in RCA: 62] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
Osteoblastic migration and proliferation in response to growth factors are essential for skeletal development, bone remodeling, and fracture repair, as well as pathologic processes, such as metastasis. We studied migration in response to platelet-derived growth factor (PDGF, 10 ng/ml) in a wounding model. PDGF stimulated a twofold increase in migration of osteoblastic MC3T3-E1 cells and murine calvarial osteoblasts over 24-48 h. PDGF also stimulated a tenfold increase in 3H-thymidine (3H-TdR) incorporation in MC3T3-E1 cells. Migration and DNA replication, as measured by BrdU incorporation, could be stimulated in the same cell. Blocking DNA replication with aphidicolin did not reduce the distance migrated. To examine the role of mitogen-activated protein (MAP) kinases in migration and proliferation, we used specific inhibitors of p38 MAP kinase, extracellular signal regulated kinase (ERK), and c-Jun N-terminal kinase (JNK). For these signaling studies, proliferation was measured by carboxyfluorescein diacetate succinimidyl ester (CFSE) using flow cytometry. Inhibition of the p38 MAP kinase pathway by SB203580 and SB202190 blocked PDGF-stimulated migration but had no effect on proliferation. Inhibition of the ERK pathway by PD98059 and U0126 inhibited proliferation but did not inhibit migration. Inhibition of JNK activity by SP600125 inhibited both migration and proliferation. Hence, the stimulation of migration and proliferation by PDGF occurred by both overlapping and independent pathways. The JNK pathway was involved in both migration and proliferation, whereas the p38 pathway was predominantly involved in migration and the ERK pathway predominantly involved in proliferation.
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Affiliation(s)
- Meenal Mehrotra
- University of Connecticut Health Center, 263 Farmington Avenue, Farmington, CT 06030, USA
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Fried J, Mitra D, Nagarajan M, Mehrotra M. Additions and Corrections - 10, 10-Difluoro-13-dehydroprostacyclin: A Chemically and Metabolically Stabilized Potent Prostacyclin. J Med Chem 2004. [DOI: 10.1021/jm00186a603] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Mehrotra M, Gupta SK, Tiwari S, Agarwal A, Kumar K, Awasthi PK, Godbole MM. Effect of oophorectomy on expression of calcium sensing receptor mRNA in rat duodenal mucosa. Indian J Exp Biol 2003; 41:41-6. [PMID: 15267134] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/30/2023]
Abstract
Calcium sensing receptor (CaR) in duodenal mucosa may be involved in active calcium absorption. Estrogen deficiency results in decreased intestinal calcium absorption. Effects of bilateral oophorectomy (OVX) have been studied on calcium homeostasis, bone mineral density (BMD) and CaR mRNA levels in duodenal mucosa at 4 weeks in adult female Sprague Dawley rats and compared with those in sham-operated and control group. There was no significant change in serum corrected calcium, inorganic phosphorous, calcidiol and intact parathyroid hormone in all the three groups. OVX rats had a significant decline in serum estrogen (E2) levels and alkaline phosphatase. They also had a significant decrease in BMD (DXA) at lumbar spine in vivo, and proximal and distal tibia in vitro while there was no significant change in serum E2 and BMD parameters in sham-operated and control rats. Northern blot analysis revealed no significant change in the CaR mRNA expression in duodenal mucosa in all three groups. The results suggests that CaR mRNA expression in duodenal mucosa is not affected by physiological circulating concentrations of estradiol in rats.
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Affiliation(s)
- M Mehrotra
- Department of Medical Endocrinology, Centre for Endocrine Sciences, Sanjay Gandhi Postgraduate Institute of Medical Sciences, Lucknow 226 014, India.
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Tiwari S, Gupta SK, Mehrotra M, Agarwal G, Awasthi PK, Godbole MM. Short-term androgen deprivation does not alter CaR and VDR mRNA expression in duodenal mucosa in male rats. Indian J Exp Biol 2002; 40:780-4. [PMID: 12597546] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 03/01/2023]
Abstract
Androgen deprivation is associated with decline in intestinal calcium absorption. The effect of androgen on CaR and VDR intestinal mucosa has not yet been studied. Calcium homeostasis, a real bone mineral density (aBMD, dual energy X-ray absorptiometry) and expression of CaR and VDR mRNA in duodenal mucosa of orchidectomized (ORX) and sham operated (Sham) adult Sprague Dawley rats at 4 week have been studied. There was no significant difference in serum calcium, alkaline phosphatase, calcidiol and calcitriol levels between both the groups. Serum testosterone (T) (ng/dl) and inorganic phosphorous (iP) (mg/dl) levels were significantly lower in ORX rats. As compared to sham rats, ORX rats had significant decline in in-vitro aBMD at proximal, middle and distal tibia, proximal, mid and distal femur and femoral neck (P < 0.05). Northern blot analysis revealed no significant alteration in the CaR and VDR mRNA expression in duodenal mucosa in ORX rats. CaR and VDR mRNA expression in duodenal mucosa is therefore, not affected by physiological concentrations of testosterone in rats.
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Affiliation(s)
- S Tiwari
- Department of Medical Endocrinology, Center of Endocrine Sciences, Sanjay Gandhi Post Graduate Institute of Medical Sciences, Lucknow 226014, India
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Rich JD, McKenzie M, Macalino G, Runnarsdottir V, Gaydos M, Mehrotra M, Stein J, Whitlock T, Salas C, Burris S. The genesis of syringe prescription to prevent HIV in Rhode Island. Health Matrix Clevel 2001; 11:129-45. [PMID: 11345673] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Grants] [Subscribe] [Scholar Register] [Indexed: 02/20/2023]
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Rich JD, Strong LL, Mehrotra M, Macalino G. Strategies to optimize the impact of needle exchange programs. AIDS Read 2000; 10:421-9. [PMID: 10932846] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Subscribe] [Scholar Register] [Indexed: 02/17/2023]
Abstract
In the United States today, half of all new HIV infections are injection drug use-associated, many of which are a result of the reuse and sharing of contaminated syringes. Thus, providing access to sterile syringes for injection drug users is an important part of preventing HIV transmission. Needle exchange programs (NEPs) have been established as one successful approach to providing sterile injection equipment. The medical literature shows that these programs are effective in decreasing both syringe sharing and HIV incidence in injection drug users. In addition, many NEPs are also beneficial because they provide other injection drug use-relevant services. There are several strategies that can be adopted in order to optimize the impact of needle exchange programs, at both the community and national levels. These include establishing NEPs in communities that need them, expanding and improving those that already exist, and implementing such programs on a larger national scale with the provision of federal funds.
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Affiliation(s)
- J D Rich
- Brown University School of Medicine, Providence, RI, USA
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Mehrotra M, Wang G, Johnson WM. Multiplex PCR for detection of genes for Staphylococcus aureus enterotoxins, exfoliative toxins, toxic shock syndrome toxin 1, and methicillin resistance. J Clin Microbiol 2000; 38:1032-5. [PMID: 10698991 PMCID: PMC86330 DOI: 10.1128/jcm.38.3.1032-1035.2000] [Citation(s) in RCA: 432] [Impact Index Per Article: 18.0] [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: 11/20/2022] Open
Abstract
A multiplex PCR assay for detection of genes for staphylococcal enterotoxins A to E (entA, entB, entC, entD, and entE), toxic shock syndrome toxin 1 (tst), exfoliative toxins A and B (etaA and etaB), and intrinsic methicillin resistance (mecA) was developed. Detection of femA was used as an internal positive control. The multiplex PCR assay combined the primers for sea to see and femA in one set and those for eta, etb, tst, mecA, and femA in the other set. Validation of the assay was performed using 176 human isolates of Staphylococcus aureus. This assay offers a very specific, quick, reliable, and inexpensive alternative to conventional PCR assays used in clinical laboratories to identify various staphylococcal toxin genes.
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Affiliation(s)
- M Mehrotra
- Special Project Unit, Bureau of Microbiology, Canadian Science Centre for Human and Animal Health, Winnipeg, Manitoba, Canada
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Abstract
Severely malnourished children (26), weight for age 55.27 +/- 3.17, were identified in a colony of predominantly Muslim urban slum dwellers of low economic status. An equal number of normally nourished children matched for age, sex and per capita income were identified. A strong relation was found between nutritional status of the subjects and educational level of their mothers (P less than 0.025). Father's education was unrelated to childrens' nutritional status. A thirty seven point questionnaire was administered to the mothers to record their nutritional knowledge, attitudes and practices (KAP). Analysis revealed that better KAP in relation to 16 of these 37 questions was not associated with better nutritional status. Seven questions were found to have only a weak association. The remaining 14 questions were identified as important for a nutrition education programme. Comparison of nutritional KAP score based on these 14 questions in case of mothers of normal and severely malnourished children revealed a significantly higher score in the former. Questions related to growth monitoring and breast feeding were not found to be important. No significant association was found between mothers' KAP and educational level. It is concluded that (i) Maternal education and KAP are significantly and independently associated with childrens' nutritional status. (ii) The content areas of knowledge, attitudes and practices significantly associated with nutritional status pertain to nutritional requirements of children, nutritional value of foods, immunisation, hygiene, oral rehydration and diarrhea.
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Affiliation(s)
- M C Gupta
- Human Nutrition Unit, All India Institute of Medical Sciences, New Delhi
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Gupta MC, Mehrotra M, Samantray JC, Arora S. Effect of giardia infection on nutritional status of preschool children. Indian J Med Res 1990; 92:341-3. [PMID: 2272671] [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: 12/31/2022] Open
Abstract
Nutritional status of 34 children aged 24-72 months and infected with giardia was compared with that of 92 children matched for age, sex and income and 34 children matched for age, sex, income as well as birth order. Children without giardiasis were found to have better nutritional status in both comparisons. The difference was more pronounced in the second instance. Of the seven anthropometric parameters used for comparison, four were significantly lower (weight, weight for age, midarm circumference and midarm circumference for age), while two (height for age and weight for height) showed nonsignificant childhood malnutrition and that matching for birth order enhances the utility of case-control studies in children.
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Affiliation(s)
- M C Gupta
- Human Nutrition Unit, All India Institute of Medical Sciences, New Delhi
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Bhatnagar A, Mehrotra M, Tripathi O. Calcium efflux and spontaneous activity of frog sinus venosus and isotonic sucrose solution. Indian J Exp Biol 1986; 24:389-94. [PMID: 3770827] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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Tripathi ON, Mehrotra M, Dhawan BN. Role of calcium channel in postvagal potentiation of contraction as evident from the effects of Mn2+, La3+, D-600, and deoxycholate on isolated guinea pig atria-vagus nerve preparation. Can J Physiol Pharmacol 1986; 64:575-80. [PMID: 2425916 DOI: 10.1139/y86-095] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
The role of the calcium channel in the first large contraction (postvagal potentiation, PVP) of the atria at the end of the inhibitory phase of its response (IPR) to vagal stimulation has been investigated by studying the effects of agents acting on the calcium channel (e.g., Ca2+, Mn2+, La3+, and D-600) or sarcoplasmic reticulum (SR) (e.g., deoxycholate (DOC)). IPR was potentiated by high [Ca2+]o (3-16 mM) and also by the calcium channel blockers, Mn2+ (1 microM-0.5 mM), La3+ (0.1 microM-0.5 mM), D-600 (1.0-10 microM), and DOC (1 microM-0.5 mM). PVP was also potentiated by enhanced [Ca2+]o, but the PVP ratio, which employs a correction for the simultaneous changes in the force of spontaneous contraction was inhibited. This indicated greater potentiation of contractility during spontaneous activity by Ca2+ than during PVP. Mn2+, La3+, and D-600 and even DOC in the above concentrations inhibited PVP but increased the PVP ratio. High concentrations of DOC (greater than 1 mM), which disrupt SR, strongly inhibited PVP. It is concluded that the calcium channel plays a more prominent role in spontaneous contractions than in PVP in guinea pig atria. PVP is suggested to be generated by excessive triggered release of Ca2+ from SR leading to a marked increase in [Ca2+]i. The calcium channel and the calcium trapped in the glycocalyx also play significant roles in PVP.
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Bhatnagar A, Mehrotra M, Tripathi O. Trifluoperazine (TFP), a calmodulin inhibitor, inhibits electrical activity of pacemaker cells of rabbit SA node. Cell Calcium 1984. [DOI: 10.1016/0143-4160(84)90107-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Tripathi O, Mehrotra M, Bhatnagar A, Kumar R, Dhawan B. Deoxycholate (DOC) induced changes in transmembrane electrical activity of guinea pig atrial trabeculae. Cell Calcium 1984. [DOI: 10.1016/0143-4160(84)90097-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Lee CW, Lewis RA, Tauber AI, Mehrotra M, Corey EJ, Austen KF. The myeloperoxidase-dependent metabolism of leukotrienes C4, D4, and E4 to 6-trans-leukotriene B4 diastereoisomers and the subclass-specific S-diastereoisomeric sulfoxides. J Biol Chem 1983; 258:15004-10. [PMID: 6317683] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Abstract
The mechanism of the metabolic inactivation of leukotrienes C4, D4, and E4 by human polymorphonuclear leukocytes activated by phorbol myristate acetate has been analyzed with the use of activated cells, their supernatants, the isolated components of the myeloperoxidase system, and chemically synthesized hypochlorous acid (HOC1). The metabolic products were resolved by reverse-phase high performance liquid chromatography in one or more solvent systems, and each product was characterized relative to chemically synthesized standards by its reverse-phase high performance liquid chromatography retention time, UV absorption spectrum, nonvascular smooth muscle spasmogenic activity, and immunoreactivity. The phorbol myristate acetate-activated human polymorphonuclear leukocytes converted each of the sulfidopeptide leukotrienes to products identical with synthetic diastereoisomers of 6-trans-leukotriene B4 by the following criteria: retention times in two solvent systems, lambda max of 269 nm with shoulders at 259 and 279 nm, and mass spectral analysis. Each of the sulfidopeptide leukotrienes was simultaneously converted to subclass-specific S-diastereoisomeric sulfoxides which co-chromatographed with synthetic standards, exhibited a bathochromic shift to a lambda max at 284 nm, were fully immunoreactive, and possessed less than 5% spasmogenic activity of the corresponding sulfidopeptide leukotrienes. When the sulfidopeptide leukotrienes were incubated with supernatants of phorbol myristate acetate-activated cells in the presence of 0.1 mM H2O2, with a mixture of 100 milliunits of myeloperoxidase, 0.1 mM H2O2, and 10 mM Cl-, or with chemically prepared HOCl, the metabolic products formed were the same as those obtained with the activated cells, indicating that extracellular inactivation was due to HOCl produced by the action of released myeloperoxidase.
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Lee CW, Lewis RA, Tauber AI, Mehrotra M, Corey EJ, Austen KF. The myeloperoxidase-dependent metabolism of leukotrienes C4, D4, and E4 to 6-trans-leukotriene B4 diastereoisomers and the subclass-specific S-diastereoisomeric sulfoxides. J Biol Chem 1983. [DOI: 10.1016/s0021-9258(17)43763-x] [Citation(s) in RCA: 25] [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: 10/22/2022] Open
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Papiha SS, Bernal JE, Mehrotra M. Genetic polymorphism of serum proteins and levels of immunoglobulin and complement components in high caste community (Brahmins) of Madhya Pradesh, India. Jinrui Idengaku Zasshi 1980; 25:1-8. [PMID: 6901787 DOI: 10.1007/bf01876539] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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