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Bansal S, Rahman M, Ravichandran R, Canez J, Fleming T, Mohanakumar T. Extracellular Vesicles in Transplantation: Friend or Foe. Transplantation 2024; 108:374-385. [PMID: 37482627 DOI: 10.1097/tp.0000000000004693] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/25/2023]
Abstract
The long-term function of transplanted organs, even under immunosuppression, is hindered by rejection, especially chronic rejection. Chronic rejection occurs more frequently after lung transplantation, termed chronic lung allograft dysfunction (CLAD), than after transplantation of other solid organs. Pulmonary infection is a known risk factor for CLAD, as transplanted lungs are constantly exposed to the external environment; however, the mechanisms by which respiratory infections lead to CLAD are poorly understood. The role of extracellular vesicles (EVs) in transplantation remains largely unknown. Current evidence suggests that EVs released from transplanted organs can serve as friend and foe. EVs carry not only major histocompatibility complex antigens but also tissue-restricted self-antigens and various transcription factors, costimulatory molecules, and microRNAs capable of regulating alloimmune responses. EVs play an important role in antigen presentation by direct, indirect, and semidirect pathways in which CD8 and CD4 cells can be activated. During viral infections, exosomes (small EVs <200 nm in diameter) can express viral antigens and regulate immune responses. Circulating exosomes may also be a viable biomarker for other diseases and rejection after organ transplantation. Bioengineering the surface of exosomes has been proposed as a tool for targeted delivery of drugs and personalized medicine. This review focuses on recent studies demonstrating the role of EVs with a focus on exosomes and their dual role (immune activation or tolerance induction) after organ transplantation, more specifically, lung transplantation.
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Affiliation(s)
- Sandhya Bansal
- Norton Thoracic Institute, St. Joseph's Hospital and Medical Center, Phoenix, AZ
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K K G, K HK, Ravichandran R, V P, S K, Jinesh KB, Mathew OP, Ananthakumar S, Mohammed ASP. Effect of titanium dioxide nanocoating on the colour stability of room temperature vulcanizing maxillofacial silicone-an invitro study. Clin Oral Investig 2023; 27:7799-7807. [PMID: 37919552 DOI: 10.1007/s00784-023-05369-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2023] [Accepted: 10/25/2023] [Indexed: 11/04/2023]
Abstract
OBJECTIVE The aim of this in vitro study was to evaluate the effect of an oxide nanocoating to prevent colour degradation of maxillofacial silicone elastomers following accelerated ageing. MATERIAL AND METHODS Specimens (N = 40) of specified dimensions were fabricated in Factor II room temperature vulcanizing (RTV) silicone and processed according to the manufacturer's instructions. Two groups were classified with 20 specimens each. Specimens in the first group were coated with titanium dioxide (TiO2) by atomic layer deposition technology. The colour stability test was conducted with a UV-VIS spectrometer (Schimadzu) for both titanium dioxide nanocoated and uncoated specimen groups after subjecting them to accelerated ageing. It was analysed using the CIE L*a*b method. RESULTS The average colour change was highest for uncoated specimens (2.868), and the average colour change for titanium dioxide-coated specimens was significantly low (1.774). The average colour change of uncoated specimens (2.868) was close to the acceptable threshold value (3), and that of coated specimens (1.774) was far below the acceptable threshold (3). CONCLUSIONS The colour change that occurred in titanium dioxide nanocoated specimens following accelerated ageing was significantly lower than that in the uncoated group, showing that the TiO2 nanocoating was effective in reducing the colour degradation of silicone elastomers. CLINICAL RELEVANCE Maxillofacial prostheses fabricated from silicone elastomers go through undesirable colour degradation over time. The development of a scientific technique that retards the colour deterioration of silicone prostheses would be of great clinical significance.
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Affiliation(s)
- Gopika K K
- Department of Prosthodontics, Government Dental College, Thiruvananthapuram, Kerala, 695011, India.
| | - Harsha Kumar K
- Department of Prosthodontics, Government Dental College, Thiruvananthapuram, Kerala, 695011, India
| | - R Ravichandran
- Department of Prosthodontics, Government Dental College, Thiruvananthapuram, Kerala, 695011, India
| | - Prasanth V
- Department of Prosthodontics, Government Dental College, Thiruvananthapuram, Kerala, 695011, India
| | - Kala S
- Department of Prosthodontics, Government Dental College, Thiruvananthapuram, Kerala, 695011, India
| | - K B Jinesh
- Department of Physics, Indian Institute of Space Science and Technology, Thiruvananthapuram, Kerala, 695011, India
| | - Oommen P Mathew
- Population Research Centre, University of Kerala, Thiruvananthapuram, Kerala, 695034, India
| | - S Ananthakumar
- Material Science and Technology Division Council of Scientific and Industrial Research-National Institute for Interdisciplinary Science and Technology, Thiruvananthapuram, Kerala, 695019, India
| | - A Sri Peer Mohammed
- Material Science and Technology Division Council of Scientific and Industrial Research-National Institute for Interdisciplinary Science and Technology, Thiruvananthapuram, Kerala, 695019, India
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Ravichandran R, Itabashi Y, Zhou F, Lin Y, Mohanakumar T, Chapman WC. Circulating exosomes from brain death and cardiac death donors have distinct molecular and immunologic properties: A pilot study. Clin Transplant 2023; 37:e15067. [PMID: 37428019 PMCID: PMC11019898 DOI: 10.1111/ctr.15067] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2022] [Revised: 05/15/2023] [Accepted: 06/19/2023] [Indexed: 07/11/2023]
Abstract
BACKGROUND AND AIMS Comparison of donation after brain death (DBD) and donation after cardiac death (DCD) lung tissue before transplantation have demonstrated activation of pro-inflammatory cytokine pathway in DBD donors. The molecular and immunological properties of circulating exosomes from DBD and DCD donors were not previously described. METHODS We collected plasma from 18 deceased donors (12 DBD and six DCD). Cytokines were analyzed by 30-Plex luminex Panels. Exosomes were analyzed for liver self-antigen (SAg), Transcription Factors and HLA class II (HLA-DR/DQ) using western blot. C57BL/6 animals were immunized with isolated exosomes to determine strength and magnitude of immune responses. Interferon (IFN)-γ and tumor necrosis factor-α producing cells were quantified by ELISPOT, specific antibodies to HLA class II antigens were measured by ELISA RESULTS: We demonstrate increased plasma levels of IFNγ, EGF, EOTAXIN, IP-10, MCP-1, RANTES, MIP-β, VEGF, and interleukins - 6/8 in DBD plasma versus DCD. MiRNA isolated from exosome of DBD donors demonstrated significant increase in miR-421, which has been reported to correlate with higher level of Interleukin-6. Higher levels of liver SAg Collagen III (p = .008), pro-inflammatory transcription factors (NF-κB, p < .05; HIF1α, p = .021), CIITA (p = .011), and HLA class II (HLA-DR, p = .0003 and HLA-DQ, p = .013) were detected in exosomes from DBD versus DCD plasma. The circulating exosomes isolated from DBD donors were immunogenic in mice and led to the development of Abs to HLA-DR/DQ. CONCLUSIONS This study provides potential new mechanisms by which DBD organs release exosomes that can activate immune pathways leading to cytokine release and allo-immune response.
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Affiliation(s)
| | - Yoshihiro Itabashi
- Norton Thoracic Institute, St. Joseph’s Hospital and Medical Center, Phoenix, AZ
| | - Fangyu Zhou
- Division of General Surgery, Washington University School of Medicine, St. Louis, MO 63110
| | - Yiing Lin
- Division of General Surgery, Washington University School of Medicine, St. Louis, MO 63110
| | | | - William C. Chapman
- Division of General Surgery, Washington University School of Medicine, St. Louis, MO 63110
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Nair S, Ravichandran R, Heilman R, Jaramillo A, Buras M, Kaplan B, Itabashi Y, Ramon D, Hacke K, Smith B, Mohanakumar T. Study of association between antibodies to non-HLA kidney self-antigens and progression to chronic immune injury after kidney transplantation. Hum Immunol 2023; 84:509-514. [PMID: 37507262 DOI: 10.1016/j.humimm.2023.07.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2023] [Revised: 07/02/2023] [Accepted: 07/13/2023] [Indexed: 07/30/2023]
Abstract
BACKGROUND Immune response to several kidney self-antigens (KSAg) such as Collagen IV (Col-IV), Perlecan (PL), and Fibronectin (FN) have been associated with antibody-mediated damage and poor allograft survival. Thus, the aim of this study was to determine if humoral immune responses to KSAg correlates with progression of chronic immune injury (CII) changes at 1 year or 2 years. METHODS Kidney transplant recipients who underwent 1- or 2-year biopsies, with chronic interstitial inflammation (ci > 1) and/or glomerular membrane double contouring (cg > 0) were analyzed with matched controls. Sera were analyzed retrospectively for antibodies against KSAg using ELISA. The presence of antibodies to KSAg were compared at 0, 4, 12, and 24 months using logistic regression. RESULTS We identified a cohort of 214 kidney transplant recipients. Of these, we identified 33 cases and matched 66 controls. Logistical regression showed an odds ratio of 1 with the confidence interval crossing 1 for the presence of response to KSAg at all the time points. CONCLUSIONS Humoral immune responses to either KSAg alone or in combination with donor-specific anti-HLA antibodies are not associated with progression to CII at 1 and 2 years after kidney transplantation.
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Affiliation(s)
- Sumi Nair
- Department of Medicine, Mayo Clinic, Phoenix, AZ, United States.
| | | | - Raymond Heilman
- Department of Medicine, Mayo Clinic, Phoenix, AZ, United States
| | - Andrés Jaramillo
- Department of Laboratory Medicine and Pathology, Mayo Clinic, Phoenix, AZ, United States
| | - Matthew Buras
- Department of Health Sciences Research, Mayo Clinic, Scottsdale, AZ, United States
| | - Bruce Kaplan
- University of Colorado, Aurora, CO, United States
| | - Yoshihiro Itabashi
- Norton Thoracic Institute, St. Joseph's Hospital and Medical Center, Phoenix, AZ, United States
| | - Daniel Ramon
- Department of Pathology, Microbiology and Immunology, Vanderbilt University Medical Center, Nashville, TN, United States
| | - Katrin Hacke
- Department of Laboratory Medicine and Pathology, Mayo Clinic, Phoenix, AZ, United States
| | - Byron Smith
- Department of Health Sciences Research, Mayo Clinic, Rochester, MN, United States
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Ravichandran R, Kaza V, Bremner R, Smith M, Mohanakumar T. Circulating Exosomes with Distinct Immune and Molecular Markers in Lung Transplanted Recipients for Cystic Fibrosis. J Heart Lung Transplant 2023. [DOI: 10.1016/j.healun.2023.02.1488] [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: 04/05/2023] Open
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Rahman M, Ravichandran R, Sankpal NV, Bansal S, Sureshbabu A, Fleming T, Perincheri S, Bharat A, Smith MA, Bremner RM, Mohanakumar T. Downregulation of a tumor suppressor gene LKB1 in lung transplantation as a biomarker for chronic murine lung allograft rejection. Cell Immunol 2023; 386:104690. [PMID: 36812767 PMCID: PMC11019891 DOI: 10.1016/j.cellimm.2023.104690] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2022] [Revised: 02/07/2023] [Accepted: 02/13/2023] [Indexed: 02/17/2023]
Abstract
BACKGROUND We recently demonstrated decreased tumor suppressor gene liver kinase B1 (LKB1) level in lung transplant recipients diagnosed with bronchiolitis obliterans syndrome. STE20-related adaptor alpha (STRADα) functions as a pseudokinase that binds and regulates LKB1 activity. METHODS A murine model of chronic lung allograft rejection in which a single lung from a B6D2F1 mouse was orthotopically transplanted into a DBA/2J mouse was employed. We examined the effect of LKB1 knockdown using CRISPR-CAS9 in vitro culture system. RESULTS Significant downregulation of LKB1 and STRADα expression was found in donor lung compared to recipient lung. STRADα knockdown significantly inhibited LKB1, pAMPK expression but induced phosphorylated mammalian target of rapamycin (mTOR), fibronectin, and Collagen-I, expression in BEAS-2B cells. LKB1 overexpression decreased fibronectin, Collagen-I, and phosphorylated mTOR expression in A549 cells. CONCLUSIONS We demonstrated that downregulation of LKB1-STRADα pathway accompanied with increased fibrosis, results in development of chronic rejection following murine lung transplantation.
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Affiliation(s)
- Mohammad Rahman
- Norton Thoracic Institute, St. Joseph's Hospital and Medical Center, Phoenix, AZ 85013, United States
| | - Ranjithkumar Ravichandran
- Norton Thoracic Institute, St. Joseph's Hospital and Medical Center, Phoenix, AZ 85013, United States
| | - Narendra V Sankpal
- Norton Thoracic Institute, St. Joseph's Hospital and Medical Center, Phoenix, AZ 85013, United States
| | - Sandhya Bansal
- Norton Thoracic Institute, St. Joseph's Hospital and Medical Center, Phoenix, AZ 85013, United States
| | - Angara Sureshbabu
- Norton Thoracic Institute, St. Joseph's Hospital and Medical Center, Phoenix, AZ 85013, United States
| | - Timothy Fleming
- Norton Thoracic Institute, St. Joseph's Hospital and Medical Center, Phoenix, AZ 85013, United States
| | | | - Ankit Bharat
- Northwestern University, Chicago, IL, United States
| | - Michael A Smith
- Norton Thoracic Institute, St. Joseph's Hospital and Medical Center, Phoenix, AZ 85013, United States
| | - Ross M Bremner
- Norton Thoracic Institute, St. Joseph's Hospital and Medical Center, Phoenix, AZ 85013, United States
| | - T Mohanakumar
- Norton Thoracic Institute, St. Joseph's Hospital and Medical Center, Phoenix, AZ 85013, United States.
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Rahman M, Bansal S, Ravichandran R, Sankpal N, Angara S, Smith M, Bremner R, Mohanakumar T. Downregulation of LKB1-Stradα Pathway in Circulating Exosomes as a Biomarker for Chronic Murine Lung Allograft Rejection. J Heart Lung Transplant 2023. [DOI: 10.1016/j.healun.2023.02.1542] [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: 04/05/2023] Open
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8
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Chin C, Ravichandran R, Sanborn K, Fleming T, Wheatcroft SB, Kearney MT, Tokman S, Walia R, Smith MA, Flint DJ, Mohanakumar T, Bremner RM, Sureshbabu A. Loss of IGFBP2 mediates alveolar type 2 cell senescence and promotes lung fibrosis. Cell Rep Med 2023; 4:100945. [PMID: 36787736 PMCID: PMC10040381 DOI: 10.1016/j.xcrm.2023.100945] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2022] [Revised: 06/01/2022] [Accepted: 01/23/2023] [Indexed: 02/15/2023]
Abstract
Accumulation of senescent cells contributes to age-related diseases including idiopathic pulmonary fibrosis (IPF). Insulin-like growth factor binding proteins (IGFBPs) regulate many biological processes; however, the functional contributions of IGFBP2 in lung fibrosis remain largely unclear. Here, we report that intranasal delivery of recombinant IGFBP2 protects aged mice from weight loss and demonstrated antifibrotic effects after bleomycin lung injury. Notably, aged human-Igfbp2 transgenic mice reveal reduced senescence and senescent-associated secretory phenotype factors in alveolar epithelial type 2 (AEC2) cells and they ameliorated bleomycin-induced lung fibrosis. Finally, we demonstrate that IGFBP2 expression is significantly suppressed in AEC2 cells isolated from fibrotic lung regions of patients with IPF and/or pulmonary hypertension compared with patients with hypersensitivity pneumonitis and/or chronic obstructive pulmonary disease. Altogether, our study provides insights into how IGFBP2 regulates AEC2-cell-specific senescence and that restoring IGFBP2 levels in fibrotic lungs can prove effective for patients with IPF.
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Affiliation(s)
- Chiahsuan Chin
- Norton Thoracic Institute, St. Joseph's Hospital and Medical Center, 124 W. Thomas Road, Ste. 100, Phoenix, AZ 85013, USA; Creighton University School of Medicine - Phoenix Regional Campus, Phoenix, AZ, USA
| | - Ranjithkumar Ravichandran
- Norton Thoracic Institute, St. Joseph's Hospital and Medical Center, 124 W. Thomas Road, Ste. 100, Phoenix, AZ 85013, USA; Creighton University School of Medicine - Phoenix Regional Campus, Phoenix, AZ, USA
| | - Kristina Sanborn
- Norton Thoracic Institute, St. Joseph's Hospital and Medical Center, 124 W. Thomas Road, Ste. 100, Phoenix, AZ 85013, USA; Creighton University School of Medicine - Phoenix Regional Campus, Phoenix, AZ, USA
| | - Timothy Fleming
- Norton Thoracic Institute, St. Joseph's Hospital and Medical Center, 124 W. Thomas Road, Ste. 100, Phoenix, AZ 85013, USA; Creighton University School of Medicine - Phoenix Regional Campus, Phoenix, AZ, USA
| | - Stephen B Wheatcroft
- Leeds Institute of Cardiovascular & Metabolic Medicine, University of Leeds, Leeds, UK
| | - Mark T Kearney
- Leeds Institute of Cardiovascular & Metabolic Medicine, University of Leeds, Leeds, UK
| | - Sofya Tokman
- Norton Thoracic Institute, St. Joseph's Hospital and Medical Center, 124 W. Thomas Road, Ste. 100, Phoenix, AZ 85013, USA; Creighton University School of Medicine - Phoenix Regional Campus, Phoenix, AZ, USA
| | - Rajat Walia
- Norton Thoracic Institute, St. Joseph's Hospital and Medical Center, 124 W. Thomas Road, Ste. 100, Phoenix, AZ 85013, USA; Creighton University School of Medicine - Phoenix Regional Campus, Phoenix, AZ, USA
| | - Michael A Smith
- Norton Thoracic Institute, St. Joseph's Hospital and Medical Center, 124 W. Thomas Road, Ste. 100, Phoenix, AZ 85013, USA; Creighton University School of Medicine - Phoenix Regional Campus, Phoenix, AZ, USA
| | - David J Flint
- Strathclyde Institute of Pharmacy & Biomedical Sciences, University of Strathclyde, Glasgow, UK
| | - Thalachallour Mohanakumar
- Norton Thoracic Institute, St. Joseph's Hospital and Medical Center, 124 W. Thomas Road, Ste. 100, Phoenix, AZ 85013, USA; Creighton University School of Medicine - Phoenix Regional Campus, Phoenix, AZ, USA
| | - Ross M Bremner
- Norton Thoracic Institute, St. Joseph's Hospital and Medical Center, 124 W. Thomas Road, Ste. 100, Phoenix, AZ 85013, USA; Creighton University School of Medicine - Phoenix Regional Campus, Phoenix, AZ, USA
| | - Angara Sureshbabu
- Norton Thoracic Institute, St. Joseph's Hospital and Medical Center, 124 W. Thomas Road, Ste. 100, Phoenix, AZ 85013, USA; Creighton University School of Medicine - Phoenix Regional Campus, Phoenix, AZ, USA.
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Razia D, Mittal SK, Bansal S, Ravichandran R, Giulini L, Smith MA, Walia R, Mohanakumar T, Bremner RM. Association Between Antibodies Against Lung Self-Antigens and Gastroesophageal Reflux in Lung Transplant Candidates. Semin Thorac Cardiovasc Surg 2023; 35:177-186. [PMID: 35181441 DOI: 10.1053/j.semtcvs.2022.02.006] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2022] [Accepted: 02/09/2022] [Indexed: 11/11/2022]
Abstract
Gastroesophageal reflux (GER) and pretransplant antibodies against lung self-antigens (SAbs) collagen-V and/or k-alpha 1 tubulin are both independently associated with allograft dysfunction after lung transplantation (LTx). The role of GER in inducing lung injury and SAbs is unknown. We aimed to study the association between pre-LTx GER and SAbs. After IRB approval, we retrieved SAb assays conducted between 2015 and 2019 and collected 24 hour GER data for these patients. Patients were divided into 2 groups: no reflux (GER-) and pathologic reflux (GER+) to compare the prevalence of SAbs. Multivariate analysis was used to study the association between GER and SAbs in the whole cohort and in restrictive lung disease (RLD) and obstructive lung disease (OLD) subsets. Proximal esophageal reflux (PER) events ≥5 was considered abnormal. Patients (n = 134; 73 men) were divided into groups: GER- (54.5%, n = 73) and GER+ (45.5%, n = 61). The prevalence of GER was higher in the RLD than in the OLD subset (p < 0.001). The overall prevalence of SAbs was 53.7% (n = 72), higher in the GER+ than the GER- group (65.6% vs 43.8%, p = 0.012), but comparable between RLD and OLD subsets. Overall, SAbs were associated with GER (p = 0.012) and abnormal PER (p = 0.017). GER and abnormal PER increased the odds of SAbs in the RLD subset (OR [95% CI]: 2.825 [1.033-7.725], p = 0.040 and OR [95% CI]: 3.551 [1.271-9.925], p = 0.014, respectively) but not in the OLD subset. LTx candidates have a high prevalence of SAbs, which are significantly associated with GER and abnormal PER in patients with RLD.
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Affiliation(s)
- Deepika Razia
- Norton Thoracic Institute, St. Joseph's Hospital and Medical Center, Phoenix, Arizona
| | - Sumeet K Mittal
- Norton Thoracic Institute, St. Joseph's Hospital and Medical Center, Phoenix, Arizona; Creighton University School of Medicine-Phoenix Regional Campus, Phoenix, Arizona.
| | - Sandhya Bansal
- Norton Thoracic Institute, St. Joseph's Hospital and Medical Center, Phoenix, Arizona
| | | | - Luca Giulini
- Norton Thoracic Institute, St. Joseph's Hospital and Medical Center, Phoenix, Arizona
| | - Michael A Smith
- Norton Thoracic Institute, St. Joseph's Hospital and Medical Center, Phoenix, Arizona; Creighton University School of Medicine-Phoenix Regional Campus, Phoenix, Arizona
| | - Rajat Walia
- Norton Thoracic Institute, St. Joseph's Hospital and Medical Center, Phoenix, Arizona; Creighton University School of Medicine-Phoenix Regional Campus, Phoenix, Arizona
| | - Thalachallour Mohanakumar
- Norton Thoracic Institute, St. Joseph's Hospital and Medical Center, Phoenix, Arizona; Creighton University School of Medicine-Phoenix Regional Campus, Phoenix, Arizona
| | - Ross M Bremner
- Norton Thoracic Institute, St. Joseph's Hospital and Medical Center, Phoenix, Arizona; Creighton University School of Medicine-Phoenix Regional Campus, Phoenix, Arizona
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Me HM, Ravichandran R, Khamash HA, Nair SS, Hacke K, Ramon DS, Mohanakumar T, Heilman RL, Jaramillo A. Direct Correlation of Soluble HLA and HLA-Containing Exosomes and Inverse Correlation of Tolerance Marker-Containing Exosomes With Antibody-Mediated Rejection After Simultaneous Liver-Kidney Transplantation: A Case Study. Transplant Proc 2022; 54:2765-2768. [DOI: 10.1016/j.transproceed.2022.10.025] [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] [Received: 08/16/2022] [Accepted: 10/16/2022] [Indexed: 11/13/2022]
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Ravichandran R, Itabashi Y, Fleming T, Bansal S, Bowen S, Poulson C, Bharat A, Bremner R, Smith M, Mohanakumar T. Low-dose IL-2 prevents murine chronic cardiac allograft rejection: Role for IL-2-induced T regulatory cells and exosomes with PD-L1 and CD73. Am J Transplant 2022; 22:2180-2194. [PMID: 35603986 DOI: 10.1111/ajt.17101] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [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: 12/07/2021] [Revised: 05/12/2022] [Accepted: 05/12/2022] [Indexed: 01/25/2023]
Abstract
To determine the effects and immunological mechanisms of low-dose interleukin-2 (IL-2) in a murine model of chronic cardiac allograft rejection (BALB/c to C57BL/6) after costimulatory blockade consisting of MR1 (250 μg/ip day 0) and CTLA4-Ig (200 μg/ip day 2), we administered low-dose IL-2 (2000 IU/day) starting on posttransplant day 14 for 3 weeks. T regulatory (Treg) cell infiltration of the grafts was determined by immunohistochemistry; circulating exosomes by western blot and aldehyde bead flow cytometry; antibodies to donor MHC by immunofluorescent staining of donor cells; and antibodies to cardiac self-antigens (myosin, vimentin) by ELISA. We demonstrated that costimulation blockade after allogeneic heart transplantation induced circulating exosomes containing cardiac self-antigens and antibodies to both donor MHC and self-antigens, leading to chronic rejection by day 45. Treatment with low-dose IL-2 prolonged allograft survival (>100 days), prevented chronic rejection, and induced splenic and graft-infiltrating CD4+ CD25+ Foxp3 Treg cells by day 45 and circulating exosomes (Foxp3+) with PD-L1 and CD73. MicroRNA 142, associated with the TGFβ pathway, was significantly downregulated in exosomes from IL-2-treated mice. In conclusion, low-dose IL-2 delays rejection in a murine model of chronic cardiac allograft rejection and also induces graft-infiltrating Tregs and circulating exosomes with immunoregulatory molecules.
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Affiliation(s)
| | - Yoshihiro Itabashi
- Norton Thoracic Institute, St. Joseph's Hospital and Medical Center, Phoenix, Arizona, USA
| | - Timothy Fleming
- Norton Thoracic Institute, St. Joseph's Hospital and Medical Center, Phoenix, Arizona, USA
| | - Sandhya Bansal
- Norton Thoracic Institute, St. Joseph's Hospital and Medical Center, Phoenix, Arizona, USA
| | - Sara Bowen
- Norton Thoracic Institute, St. Joseph's Hospital and Medical Center, Phoenix, Arizona, USA
| | - Christin Poulson
- Norton Thoracic Institute, St. Joseph's Hospital and Medical Center, Phoenix, Arizona, USA
| | - Ankit Bharat
- Department of surgery, Northwestern University, Chicago, Illinois, USA
| | - Ross Bremner
- Norton Thoracic Institute, St. Joseph's Hospital and Medical Center, Phoenix, Arizona, USA
| | - Michael Smith
- Norton Thoracic Institute, St. Joseph's Hospital and Medical Center, Phoenix, Arizona, USA
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Ravichandran R, Bansal S, Rahman M, Sureshbabu A, Sankpal N, Fleming T, Bharat A, Mohanakumar T. Extracellular Vesicles Mediate Immune Responses to Tissue-Associated Self-Antigens: Role in Solid Organ Transplantations. Front Immunol 2022; 13:861583. [PMID: 35572510 PMCID: PMC9094427 DOI: 10.3389/fimmu.2022.861583] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2022] [Accepted: 03/28/2022] [Indexed: 11/13/2022] Open
Abstract
Transplantation is a treatment option for patients diagnosed with end-stage organ diseases; however, long-term graft survival is affected by rejection of the transplanted organ by immune and nonimmune responses. Several studies have demonstrated that both acute and chronic rejection can occur after transplantation of kidney, heart, and lungs. A strong correlation has been reported between de novo synthesis of donor-specific antibodies (HLA-DSAs) and development of both acute and chronic rejection; however, some transplant recipients with chronic rejection do not have detectable HLA-DSAs. Studies of sera from such patients demonstrate that immune responses to tissue-associated antigens (TaAgs) may also play an important role in the development of chronic rejection, either alone or in combination with HLA-DSAs. The synergistic effect between HLA-DSAs and antibodies to TaAgs is being established, but the underlying mechanism is yet to be defined. We hypothesize that HLA-DSAs damage the transplanted donor organ resulting in stress and leading to the release of extracellular vesicles, which contribute to chronic rejection. These vesicles express both donor human leukocyte antigen (HLA) and non-HLA TaAgs, which can activate antigen-presenting cells and lead to immune responses and development of antibodies to both donor HLA and non-HLA tissue-associated Ags. Extracellular vesicles (EVs) are released by cells under many circumstances due to both physiological and pathological conditions. Primarily employing clinical specimens obtained from human lung transplant recipients undergoing acute or chronic rejection, our group has demonstrated that circulating extracellular vesicles display both mismatched donor HLA molecules and lung-associated Ags (collagen-V and K-alpha 1 tubulin). This review focuses on recent studies demonstrating an important role of antibodies to tissue-associated Ags in the rejection of transplanted organs, particularly chronic rejection. We will also discuss the important role of extracellular vesicles released from transplanted organs in cross-talk between alloimmunity and autoimmunity to tissue-associated Ags after solid organ transplantation.
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Affiliation(s)
| | - Sandhya Bansal
- Norton Thoracic Institute, St. Joseph's Hospital and Medical Center, Phoenix, AZ, United States
| | - Mohammad Rahman
- Norton Thoracic Institute, St. Joseph's Hospital and Medical Center, Phoenix, AZ, United States
| | - Angara Sureshbabu
- Norton Thoracic Institute, St. Joseph's Hospital and Medical Center, Phoenix, AZ, United States
| | - Narendra Sankpal
- Norton Thoracic Institute, St. Joseph's Hospital and Medical Center, Phoenix, AZ, United States
| | - Timothy Fleming
- Norton Thoracic Institute, St. Joseph's Hospital and Medical Center, Phoenix, AZ, United States
| | - Ankit Bharat
- Department of Surgery-Thoracic, Northwestern University, Chicago, IL, United States
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Ravichandran R, Itabashi Y, Fleming T, Poulson C, Bremner R, Smith M, Mohanakumar T. Low Dose IL-2 Therapy Induces T Regulatory Cell Derived Circulatory Exosomes Containing PDL1 and CD73 and Abrogates Development of Chronic Cardiac Allograft Rejection. J Heart Lung Transplant 2022. [DOI: 10.1016/j.healun.2022.01.353] [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: 11/16/2022] Open
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14
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Rahman M, Ravichandran R, Bansal S, Sanborn K, Bowen S, Eschbacher J, Sureshbabu A, Fleming T, Bharat A, Walia R, Hachem R, Bremner RM, Smith MA, Mohanakumar T. Novel role for tumor suppressor gene, liver kinase B1, in epithelial-mesenchymal transition leading to chronic lung allograft dysfunction. Am J Transplant 2022; 22:843-852. [PMID: 34859569 DOI: 10.1111/ajt.16903] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2021] [Revised: 11/16/2021] [Accepted: 11/16/2021] [Indexed: 01/25/2023]
Abstract
Epithelial-mesenchymal transition (EMT) has been implicated to play a role in chronic lung allograft dysfunction (CLAD). Liver kinase B1 (LKB1), a tumor suppressor gene, can regulate EMT. However, its role in CLAD development following lung transplantation remains unknown. Using qRT-PCR, biopsies from lung transplant recipients with bronchiolitis obliterans syndrome (BOS) demonstrated significant downregulation of LKB1 (p = .0001), compared to stable biopsies. To determine the role of LKB1 in EMT development, we analyzed EMT in human bronchial epithelial cell line BEAS-2B. Knockdown of LKB1 by siRNA significantly dysregulated mesenchymal markers expression in BEAS-2B cells. Following incubation of human primary bronchial epithelial cell or BEAS-2B cells with exosomes isolated from BOS or stable lung transplant recipients, LKB1 expression was inhibited when incubated with BOS-exosome. Incubation with BOS-exosomes also decreased LKB1 expression and induced EMT markers in air-liquid interface culture method. Our results provide novel evidence that exosomes released from transplanted lungs undergoing chronic rejection are associated with inactivated tumor suppressor gene LKB1 and this loss induces EMT leading to the pathogenesis of CLAD following human lung transplantation.
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Affiliation(s)
- Mohammad Rahman
- St. Joseph's Hospital and Medical Center, Norton Thoracic Institute, Phoenix, Arizona
| | | | - Sandhya Bansal
- St. Joseph's Hospital and Medical Center, Norton Thoracic Institute, Phoenix, Arizona
| | - Kristina Sanborn
- St. Joseph's Hospital and Medical Center, Norton Thoracic Institute, Phoenix, Arizona
| | - Sara Bowen
- St. Joseph's Hospital and Medical Center, Norton Thoracic Institute, Phoenix, Arizona
| | - Jennifer Eschbacher
- St. Joseph's Hospital and Medical Center, Barrow Neurological Institute, Phoenix, Arizona
| | - Angara Sureshbabu
- St. Joseph's Hospital and Medical Center, Norton Thoracic Institute, Phoenix, Arizona
| | - Timothy Fleming
- St. Joseph's Hospital and Medical Center, Norton Thoracic Institute, Phoenix, Arizona
| | | | - Rajat Walia
- St. Joseph's Hospital and Medical Center, Norton Thoracic Institute, Phoenix, Arizona
| | - Ramsey Hachem
- Washington University School of Medicine, St. Louis, Missouri
| | - Ross M Bremner
- St. Joseph's Hospital and Medical Center, Norton Thoracic Institute, Phoenix, Arizona
| | - Michael A Smith
- St. Joseph's Hospital and Medical Center, Norton Thoracic Institute, Phoenix, Arizona
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15
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Razia D, Mittal SK, Bansal S, Ravichandran R, Smith MA, Walia R, Bremner RM, Mohanakumar T, Tokman S. Lung Transplant Candidates With Pretransplant Gastroesophageal Reflux and Antibodies to Lung Self-antigens Have Shorter CLAD-free Survival After Transplant. Transplant Direct 2022; 8:e1294. [PMID: 35187218 PMCID: PMC8845115 DOI: 10.1097/txd.0000000000001294] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2021] [Revised: 01/07/2022] [Accepted: 01/11/2022] [Indexed: 12/03/2022] Open
Abstract
Pre–lung transplant (LTx) gastroesophageal reflux (GER) and circulating antibodies against the lung self-antigens (SAbs) collagen V and K-alpha-1 tubulin may predispose recipients to chronic lung allograft dysfunction (CLAD). We aimed to study the association of pre-LTx GER or pre-LTx SAbs with CLAD.
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16
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Sweet SC, Armstrong B, Blatter J, Chin H, Conrad C, Goldfarb S, Hayes D, Heeger PS, Lyou V, Melicoff-Portillo E, Mohanakumar T, Odim J, Ravichandran R, Schecter M, Storch GA, Visner G, Williams NM, Danziger-Isakov L. CTOTC-08: A multicenter randomized controlled trial of rituximab induction to reduce antibody development and improve outcomes in pediatric lung transplant recipients. Am J Transplant 2022; 22:230-244. [PMID: 34599540 DOI: 10.1111/ajt.16862] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2021] [Revised: 09/01/2021] [Accepted: 09/13/2021] [Indexed: 01/25/2023]
Abstract
We conducted a randomized, placebo-controlled, double-blind study of pediatric lung transplant recipients, hypothesizing that rituximab plus rabbit anti-thymocyte globulin induction would reduce de novo donor-specific human leukocyte antigen antibodies (DSA) development and improve outcomes. We serially obtained clinical data, blood, and respiratory samples for at least one year posttransplant. We analyzed peripheral blood lymphocytes by flow cytometry, serum for antibody development, and respiratory samples for viral infections using multiplex PCR. Of 45 subjects enrolled, 34 were transplanted and 27 randomized to rituximab (n = 15) or placebo (n = 12). No rituximab-treated subjects versus five placebo-treated subjects developed de novo DSA with mean fluorescence intensity >2000. There was no difference between treatment groups in time to the primary composite outcome endpoint (death, bronchiolitis obliterans syndrome [BOS] grade 0-p, obliterative bronchiolitis or listing for retransplant). A post-hoc analysis substituting more stringent chronic lung allograft dysfunction criteria for BOS 0-p showed no difference in outcome (p = .118). The incidence of adverse events including infection and rejection episodes was no different between treatment groups. Although the study was underpowered, we conclude that rituximab induction may have prevented early DSA development in pediatric lung transplant recipients without adverse effects and may improve outcomes (Clinical Trials: NCT02266888).
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Affiliation(s)
| | | | | | | | - Carol Conrad
- Lucile Packard Children's Hospital/Stanford Children's Health, Palo Alto, California
| | - Samuel Goldfarb
- Masonic Children's Hospital, University of Minnesota, Minneapolis, Minnesota
| | - Don Hayes
- Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio
| | - Peter S Heeger
- Department of Medicine, Translational Transplant Research Center, Icahn School of Medicine at Mount Sinai, New York, New York
| | - Victoria Lyou
- Department of Medicine, Translational Transplant Research Center, Icahn School of Medicine at Mount Sinai, New York, New York
| | | | | | - Jonah Odim
- NIAID, National Institutes of Health, Bethesda, Maryland
| | | | - Marc Schecter
- University of Florida College of Medicine, Gainesville, Florida
| | | | - Gary Visner
- Boston Children's Hospital, Boston, Massachusetts
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Ravichandran R, Itabashi Y, Liu W, Bansal S, Rahman M, Poulson C, Fleming T, Bremner RM, Smith M, Mohanakumar T. A decline in club cell secretory proteins in lung transplantation is associated with release of natural killer cells exosomes leading to chronic rejection. J Heart Lung Transplant 2021; 40:1517-1528. [PMID: 34627707 PMCID: PMC11019779 DOI: 10.1016/j.healun.2021.08.016] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2021] [Revised: 08/06/2021] [Accepted: 08/30/2021] [Indexed: 11/17/2022] Open
Abstract
BACKGROUND In human lung transplant recipients, a decline in club cell secretory protein (CCSP) in bronchoalveolar lavage fluid has been associated with chronic lung allograft dysfunction (CLAD) as well as the induction of exosomes and immune responses that lead to CLAD. However, the mechanisms by which CCSP decline contributes to CLAD remain unknown. METHODS To define the mechanisms leading to CCSP decline and chronic rejection, we employed two mouse models: 1) chronic rejection after orthotopic single lung transplantation and 2) anti-major histocompatibility complex (MHC) class I-induced obliterative airway disease. RESULTS In the chronic rejection mouse model, we detected circulating exosomes with donor MHC (H2b) and lung self-antigens and also development of antibodies to H2b and lung self-antigens and then a decline in CCSP. Furthermore, DBA2 mice that received injections of these exosomes developed antibodies to donor MHC and lung self-antigens. In the chronic rejection mouse model, natural killer (NK) and CD8 T cells were the predominant graft-infiltrating cells on day 14 of rejection followed by exosomes containing NK cell-associated and cytotoxic molecules on day 14 and 28. When NK cells were depleted, exosomes with NK cell-associated and cytotoxic molecules as well as fibrosis decreased. CONCLUSIONS Induction of exosomes led to immune responses to donor MHC and lung self-antigens, resulting in CCSP decline, leading to NK cell infiltration and release of exosomes from NK cells. These results suggest a novel role for exosomes derived from NK cells in the pathogenesis of chronic lung allograft rejection.
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Affiliation(s)
| | | | - Wei Liu
- Norton Thoracic Institute, Phoenix, Arizona
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18
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Macedo C, Tran LM, Zahorchak AF, Dai H, Gu X, Ravichandran R, Mohanakumar T, Elinoff B, Zeevi A, Styn MA, Humar A, Lakkis FG, Metes DM, Thomson AW. Donor-derived regulatory dendritic cell infusion results in host cell cross-dressing and T cell subset changes in prospective living donor liver transplant recipients. Am J Transplant 2021; 21:2372-2386. [PMID: 33171019 PMCID: PMC8215622 DOI: 10.1111/ajt.16393] [Citation(s) in RCA: 32] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2020] [Revised: 10/13/2020] [Accepted: 11/01/2020] [Indexed: 01/25/2023]
Abstract
Regulatory dendritic cells (DCreg) promote transplant tolerance following their adoptive transfer in experimental animals. We investigated the feasibility, safety, fate, and impact on host T cells of donor monocyte-derived DCreg infused into prospective, living donor liver transplant patients, 7 days before transplantation. The DCreg expressed a tolerogenic gene transcriptional profile, high cell surface programed death ligand-1 (PD-L1):CD86 ratios, high IL-10/no IL-12 productivity and poor ability to stimulate allogeneic T cell proliferation. Target DCreg doses (range 2.5-10 × 106 cells/kg) were achieved in all but 1 of 15 recipients, with no infusion reactions. Following DCreg infusion, transiently elevated levels of donor HLA and immunoregulatory PD-L1, CD39, and CD73 were detected in circulating small extracellular vesicles. At the same time, flow and advanced image stream analysis revealed intact DCreg and "cross-dressing" of host DCs in blood and lymph nodes. PD-L1 co-localization with donor HLA was observed at higher levels than with recipient HLA. Between DCreg infusion and transplantation, T-bethi Eomeshi memory CD8+ T cells decreased, whereas regulatory (CD25hi CD127- Foxp3+ ): T-bethi Eomeshi CD8+ T cell ratios increased. Thus, donor-derived DCreg infusion may induce systemic changes in host antigen-presenting cells and T cells potentially conducive to modulated anti-donor immune reactivity at the time of transplant.
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Affiliation(s)
- Camila Macedo
- Department of Surgery, Thomas E. Starzl Transplantation Institute, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania
| | - Lillian M. Tran
- Department of Surgery, Thomas E. Starzl Transplantation Institute, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania
| | - Alan F. Zahorchak
- Department of Surgery, Thomas E. Starzl Transplantation Institute, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania
| | - Helong Dai
- Department of Surgery, Thomas E. Starzl Transplantation Institute, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania
| | - Xinyan Gu
- Department of Surgery, Thomas E. Starzl Transplantation Institute, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania
| | | | | | - Beth Elinoff
- Department of Surgery, Thomas E. Starzl Transplantation Institute, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania
| | - Adriana Zeevi
- Department of Surgery, Thomas E. Starzl Transplantation Institute, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania,Department of Pathology, University of Pittsburgh, School of Medicine, Pittsburgh, Pennsylvania,Department of Immunology, University of Pittsburgh, School of Medicine, Pittsburgh, Pennsylvania
| | - Mindi A. Styn
- Department of Surgery, Thomas E. Starzl Transplantation Institute, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania
| | - Abhinav Humar
- Department of Surgery, Thomas E. Starzl Transplantation Institute, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania
| | - Fadi G. Lakkis
- Department of Surgery, Thomas E. Starzl Transplantation Institute, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania,Department of Immunology, University of Pittsburgh, School of Medicine, Pittsburgh, Pennsylvania
| | - Diana M. Metes
- Department of Surgery, Thomas E. Starzl Transplantation Institute, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania,Department of Immunology, University of Pittsburgh, School of Medicine, Pittsburgh, Pennsylvania
| | - Angus W. Thomson
- Department of Surgery, Thomas E. Starzl Transplantation Institute, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania,Department of Immunology, University of Pittsburgh, School of Medicine, Pittsburgh, Pennsylvania
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Itabashi Y, Ravichandran R, Bansal S, Bharat A, Hachem R, Bremner R, Smith M, Mohanakumar T. Decline in Club Cell Secretory Proteins, Exosomes Induction and Immune Responses to Lung Self-antigens, Kα1 Tubulin and Collagen V, Leading to Chronic Rejection After Human Lung Transplantation. Transplantation 2021; 105:1337-1346. [PMID: 32890135 PMCID: PMC7917153 DOI: 10.1097/tp.0000000000003428] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [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: 01/02/2023]
Abstract
BACKGROUND Chronic lung allograft dysfunction (CLAD), is a major hurdle for long-term lung allograft survival after lung transplant and roughly 50% of lung transplant recipients (LTxRs) develop CLAD within 5 years. The mechanisms of CLAD development remain unknown. Donor-specific immune responses to HLA and lung self-antigens (SAgs) are vital to the pathogenesis of CLAD. Reduction in Club cell secretory protein (CCSP) has been reported in bronchoalveolar lavage (BAL) fluid samples from LTxRs with bronchiolitis obliterans syndrome (BOS). CCSP levels in BAL fluid and development of antibodies to lung SAgs in plasma were determined by ELISA. Cytokines in BAL fluid were analyzed by 30-plex Luminex panel. Exosomes from BAL fluid or plasma were analyzed for SAgs, natural killer (NK) cells markers, and cytotoxic molecules. RESULTS We demonstrate that LTxRs with BOS have lower CCSP levels up to 9 months before BOS diagnosis. LTxRs with antibodies to SAgs 1-year posttransplant also developed DSA (43%) and had lower CCSP. BOS with lower CCSP also induced Interleukin-8 and reduced vascular endothelial growth factor. Exosomes from BOS contained increased SAgs, NK cells markers, and cytotoxic molecules. CONCLUSIONS We conclude lower CCSP leads to inflammation, pro-inflammatory cytokine production, immune responses to HLA and SAgs, and induction of exosomes. For the first time, we demonstrate that CCSP loss results in exosome release from NK cells capable of stimulating innate and adaptive immunity posttransplant. This increases the risk of BOS, suggesting a role of NK cell exosomes in CLAD development.
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Affiliation(s)
- Yoshihiro Itabashi
- Norton Thoracic Institute, St. Joseph’s Hospital and Medical Center, Phoenix, AZ
| | | | - Sandhya Bansal
- Norton Thoracic Institute, St. Joseph’s Hospital and Medical Center, Phoenix, AZ
| | - Ankit Bharat
- Department of Surgery, University of Chicago, Chicago, IL, United States
| | - Ramsey Hachem
- Division of Pulmonary and Critical Care Medicine, Washington University School of Medicine, St. Louis, MO
| | - Ross Bremner
- Norton Thoracic Institute, St. Joseph’s Hospital and Medical Center, Phoenix, AZ
| | - Michael Smith
- Norton Thoracic Institute, St. Joseph’s Hospital and Medical Center, Phoenix, AZ
| | - T. Mohanakumar
- Norton Thoracic Institute, St. Joseph’s Hospital and Medical Center, Phoenix, AZ
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20
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Ravichandran R, Itabashi Y, Liu W, Poulson C, Fleming T, Mohanakumar T. Low Dose Interleukin-2 Induces Exosomes with Tolerance Markers (PDL1, CD73) and Significantly Delays Development of Chronic Rejection Following Murine Heterotopic Cardiac Transplantation. J Heart Lung Transplant 2021. [DOI: 10.1016/j.healun.2021.01.1814] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022] Open
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21
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Razia D, Mittal S, Bremner R, Bansal S, Ravichandran R, Smith M, Walia R, Mohanakumar T, Tokman S. Pretransplant GERD-Induced Immune Response Predisposes to CLAD. J Heart Lung Transplant 2021. [DOI: 10.1016/j.healun.2021.01.1884] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022] Open
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22
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Sharma M, Ravichandran R, Perincheri S, Danziger-Isakov L, Heeger PS, Sweet SC, Mohanakumar T. Distinct molecular and immunological properties of circulating exosomes isolated from pediatric lung transplant recipients with bronchiolitis obliterans syndrome - a retrospective study. Transpl Int 2020; 33:1491-1502. [PMID: 33448479 DOI: 10.1111/tri.13720] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [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: 06/04/2020] [Revised: 07/10/2020] [Accepted: 08/10/2020] [Indexed: 12/16/2022]
Abstract
Long-term success following human lung transplantation is poor due to chronic rejection. We demonstrated circulating exosomes of lung origin during acute and chronic lung allograft rejection. We analyzed plasma from pediatric lung transplant recipients (LTxRs) enrolled in the CTOT-C-03 to determine whether circulating exosomes are released into circulation during bronchiolitis obliterans syndrome (BOS). Plasma exosomes were isolated, and human leukocyte antigens (HLA) were detected. Exosomes were analyzed for lung self-antigens (SAgs), co-stimulatory molecules transcription factors, major histocompatibility complex class II (MHC-II), adhesion molecules, and 20S proteasome. Mice were immunized with exosomes from BOS or stable to determine their immunogenicity. Circulating exosomes from BOS LTxRs contained increased levels of SAgs, donor HLA class I, MHC-II, transcription factors, co-stimulatory molecules, and 20S proteasome compared with stable. Serial analysis of exosomes containing SAgs demonstrated that exosomes are detectable in the circulation before BOS. Mice immunized with exosomes from BOS, or stable, demonstrated that exosomes from BOS are distinct in inducing both humoral and cellular immune responses to SAgs. Circulating exosomes from BOS LTxRs elicit distinct humoral and cellular response. In addition, detection of SAgs on circulatory exosomes 12 months before diagnosis of BOS suggest that exosomes could serve as biomarker.
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Affiliation(s)
- Monal Sharma
- Norton Thoracic Institute, St. Joseph's Hospital and Medical Center, Phoenix, AZ, USA
| | | | - Sudhir Perincheri
- Department of Pathology, Yale School of Pathology, New Haven, CT, USA
| | | | - Peter S Heeger
- Icahn School of Medicine at Mount Sinai, New York City, NY, USA
| | - Stuart C Sweet
- Washington University Medical School, St. Louis, MO, USA
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23
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Sharma M, Gunasekaran M, Ravichandran R, Fisher CE, Limaye AP, Hu C, McDyer J, Kaza V, Bharat A, Tokman S, Omar A, Arjuna A, Walia R, Bremner RM, Smith MA, Hachem RR, Mohanakumar T. Circulating exosomes with lung self-antigens as a biomarker for chronic lung allograft dysfunction: A retrospective analysis. J Heart Lung Transplant 2020; 39:1210-1219. [PMID: 32713614 DOI: 10.1016/j.healun.2020.07.001] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [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: 05/07/2020] [Revised: 06/18/2020] [Accepted: 07/01/2020] [Indexed: 02/07/2023] Open
Abstract
BACKGROUND Exosomes isolated from plasma of lung transplant recipients (LTxRs) with bronchiolitis obliterans syndrome (BOS) contain human leukocyte antigens and lung self-antigens (SAgs), K-alpha 1 tubulin (Kα1T) and collagen type V (Col-V). The aim was to determine the use of circulating exosomes with lung SAgs as a biomarker for BOS. METHODS Circulating exosomes were isolated retrospectively from plasma from LTxRs at diagnosis of BOS and at 6 and 12 months before the diagnosis (n = 41) and from stable time-matched controls (n = 30) at 2 transplant centers by ultracentrifugation. Exosomes were validated using Nanosight, and lung SAgs (Kα1T and Col-V) were detected by immunoblot and semiquantitated using ImageJ software. RESULTS Circulating exosomes from BOS and stable LTxRs demonstrated 61- to 181-nm vesicles with markers Alix and CD9. Exosomes from LTxRs with BOS (n = 21) showed increased levels of lung SAgs compared with stable (n = 10). A validation study using 2 separate cohorts of LTxRs with BOS and stable time-matched controls from 2 centers also demonstrated significantly increased lung SAgs-containing exosomes at 6 and 12 months before BOS. CONCLUSIONS Circulating exosomes isolated from LTxRs with BOS demonstrated increased levels of lung SAgs (Kα1T and Col-V) 12 months before the diagnosis (100% specificity and 90% sensitivity), indicating that circulating exosomes with lung SAgs can be used as a non-invasive biomarker for identifying LTxRs at risk for BOS.
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Affiliation(s)
- Monal Sharma
- Norton Thoracic Institute, St Joseph's Hospital and Medical Center, Phoenix, Arizona
| | | | | | - Cynthia E Fisher
- Deparment of Medicine, University of Washington, Seattle, Washington
| | - Ajit P Limaye
- Deparment of Medicine, University of Washington, Seattle, Washington
| | - Chengcheng Hu
- Department of Epidemiology and Biostatistics, University of Arizona, Phoenix, Arizona
| | - John McDyer
- Division of Pulmonary, Allergy and Critical Care Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania
| | - Vaidehi Kaza
- Internal Medicine-Pulmonary Disease, University of Texas Southwestern, Dallas, Texas
| | - Ankit Bharat
- Department of Surgery-Thoracic, Northwestern University, Chicago, Illinois
| | - Sofya Tokman
- Norton Thoracic Institute, St Joseph's Hospital and Medical Center, Phoenix, Arizona
| | - Ashraf Omar
- Norton Thoracic Institute, St Joseph's Hospital and Medical Center, Phoenix, Arizona
| | - Ashwini Arjuna
- Norton Thoracic Institute, St Joseph's Hospital and Medical Center, Phoenix, Arizona
| | - Rajat Walia
- Norton Thoracic Institute, St Joseph's Hospital and Medical Center, Phoenix, Arizona
| | - Ross M Bremner
- Norton Thoracic Institute, St Joseph's Hospital and Medical Center, Phoenix, Arizona
| | - Michael A Smith
- Norton Thoracic Institute, St Joseph's Hospital and Medical Center, Phoenix, Arizona
| | - Ramsey R Hachem
- Department of Internal Medicine, Washington University Medical School, St Louis, Missouri
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Ravichandran R, Itabashi Y, Liu W, Mohanakumar T. Role for Circulating Exosomes with Cardiac Self-Antigens (Myosin and Vimentin) in the Pathogenesis of Chronic Rejection in a Murine Heterotopic Model of Cardiac Transplantation. J Heart Lung Transplant 2020. [DOI: 10.1016/j.healun.2020.01.025] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
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25
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Gunasekaran M, Bansal S, Ravichandran R, Sharma M, Perincheri S, Rodriguez F, Hachem R, Fisher CE, Limaye AP, Omar A, Smith MA, Bremner RM, Mohanakumar T. Respiratory viral infection in lung transplantation induces exosomes that trigger chronic rejection. J Heart Lung Transplant 2020; 39:379-388. [PMID: 32033844 PMCID: PMC7102671 DOI: 10.1016/j.healun.2019.12.009] [Citation(s) in RCA: 64] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2019] [Revised: 11/25/2019] [Accepted: 12/29/2019] [Indexed: 01/02/2023] Open
Abstract
BACKGROUND Respiratory viral infections can increase the risk of chronic lung allograft dysfunction after lung transplantation, but the mechanisms are unknown. In this study, we determined whether symptomatic respiratory viral infections after lung transplantation induce circulating exosomes that contain lung-associated self-antigens and assessed whether these exosomes activate immune responses to self-antigens. METHODS Serum samples were collected from lung transplant recipients with symptomatic lower- and upper-tract respiratory viral infections and from non-symptomatic stable recipients. Exosomes were isolated via ultracentrifugation; purity was determined using sucrose cushion; and presence of lung self-antigens, 20S proteasome, and viral antigens for rhinovirus, coronavirus, and respiratory syncytial virus were determined using immunoblot. Mice were immunized with circulating exosomes from each group and resulting differential immune responses and lung histology were analyzed. RESULTS Exosomes containing self-antigens, 20S proteasome, and viral antigens were detected at significantly higher levels (p < 0.05) in serum of recipients with symptomatic respiratory viral infections (n = 35) as compared with stable controls (n = 32). Mice immunized with exosomes from recipients with respiratory viral infections developed immune responses to self-antigens, fibrosis, small airway occlusion, and significant cellular infiltration; mice immunized with exosomes from controls did not (p < 0.05). CONCLUSIONS Circulating exosomes isolated from lung transplant recipients diagnosed with respiratory viral infections contained lung self-antigens, viral antigens, and 20S proteasome and elicited immune responses to lung self-antigens that resulted in development of chronic lung allograft dysfunction in immunized mice.
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Affiliation(s)
| | - Sandhya Bansal
- St. Joseph's Hospital and Medical Center, Norton Thoracic Institute, Phoenix, Arizona
| | | | - Monal Sharma
- St. Joseph's Hospital and Medical Center, Norton Thoracic Institute, Phoenix, Arizona
| | - Sudhir Perincheri
- Department of Pathology, Yale School of Medicine, New Haven, Connecticut
| | - Francisco Rodriguez
- St. Joseph's Hospital and Medical Center, Norton Thoracic Institute, Phoenix, Arizona
| | - Ramsey Hachem
- Department of Medicine, Washington University School of Medicine, St. Louis, Missouri
| | - Cynthia E Fisher
- Division of Allergy and Infectious Diseases, University of Washington, Seattle, Washington
| | - Ajit P Limaye
- Division of Allergy and Infectious Diseases, University of Washington, Seattle, Washington
| | - Ashraf Omar
- St. Joseph's Hospital and Medical Center, Norton Thoracic Institute, Phoenix, Arizona
| | - Michael A Smith
- St. Joseph's Hospital and Medical Center, Norton Thoracic Institute, Phoenix, Arizona
| | - Ross M Bremner
- St. Joseph's Hospital and Medical Center, Norton Thoracic Institute, Phoenix, Arizona
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Ravichandran R, Amalnath D, Shaha KK, Srinivas BH. Paraquat Poisoning: A Retrospective Study of 55 Patients From a Tertiary Care Center in Southern India. Indian J Crit Care Med 2020; 24:155-159. [PMID: 32435092 PMCID: PMC7225766 DOI: 10.5005/jp-journals-10071-23369] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
Background In India the data on paraquat (PQ) poisoning are limited to case reports and small case series. Hence, this study was carried out to understand the clinical features and outcomes of PQ poisoning. We also briefly report the relevant Indian studies on PQ poisoning. Materials and methods This was a retrospective case record-based study of PQ poisoning victims admitted over a period of 5 years. Results Of the 55 patients included in this study, the in-hospital mortality rate was 72.7%. Acute kidney injury was the most common manifestation. The use of cyclophosphamide did not affect the clinical outcome. Hemoperfusion (HP) was not done for any patient. Pulmonary edema and acute tubular necrosis were the most common histopathological findings. Conclusion In India, this is one of the most comprehensive studies of PQ toxicity. Hence, we hope that this information would be of use to clinicians who deal with PQ poisoning. How to cite this article Ravichandran R, Amalnath D, Shaha KK, Srinivas BH. Paraquat Poisoning: A Retrospective Study of 55 Patients from a Tertiary Care Center in Southern India. Indian J Crit Care Med 2020;24(3):155–159.
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Affiliation(s)
- R Ravichandran
- Department of Medicine, Jawaharlal Institute of Postgraduate Medical Education and Research, Puducherry, India
| | - Deepak Amalnath
- Department of Medicine, Jawaharlal Institute of Postgraduate Medical Education and Research, Puducherry, India
| | - Kusa K Shaha
- Department of Forensic Medicine and Toxicology, Jawaharlal Institute of Postgraduate Medical Education and Research, Puducherry, India
| | - B H Srinivas
- Department of Pathology, Jawaharlal Institute of Postgraduate Medical Education and Research, Puducherry, India
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Thiagarajan R, Varsha MKNS, Srinivasan V, Ravichandran R, Saraboji K. Vitamin K1 prevents diabetic cataract by inhibiting lens aldose reductase 2 (ALR2) activity. Sci Rep 2019; 9:14684. [PMID: 31604989 PMCID: PMC6789135 DOI: 10.1038/s41598-019-51059-2] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2019] [Accepted: 09/24/2019] [Indexed: 12/22/2022] Open
Abstract
This study investigated the potential of vitamin K1 as a novel lens aldose reductase inhibitor in a streptozotocin-induced diabetic cataract model. A single, intraperitoneal injection of streptozotocin (STZ) (35 mg/kg) resulted in hyperglycemia, activation of lens aldose reductase 2 (ALR2) and accumulation of sorbitol in eye lens which could have contributed to diabetic cataract formation. However, when diabetic rats were treated with vitamin K1 (5 mg/kg, sc, twice a week) it resulted in lowering of blood glucose and inhibition of lens aldose reductase activity because of which there was a corresponding decrease in lens sorbitol accumulation. These results suggest that vitamin K1 is a potent inhibitor of lens aldose reductase enzyme and we made an attempt to understand the nature of this inhibition using crude lens homogenate as well as recombinant human aldose reductase enzyme. Our results from protein docking and spectrofluorimetric analyses clearly show that vitamin K1 is a potent inhibitor of ALR2 and this inhibition is primarily mediated by the blockage of DL-glyceraldehyde binding to ALR2. At the same time docking also suggests that vitamin K1 overlaps at the NADPH binding site of ALR2, which probably shows that vitamin K1 could possibly bind both these sites in the enzyme. Another deduction that we can derive from the experiments performed with pure protein is that ALR2 has three levels of affinity, first for NADPH, second for vitamin K1 and third for the substrate DL-glyceraldehyde. This was evident based on the dose-dependency experiments performed with both NADPH and DL-glyceraldehyde. Overall, our study shows the potential of vitamin K1 as an ALR2 inhibitor which primarily blocks enzyme activity by inhibiting substrate interaction of the enzyme. Further structural studies are needed to fully comprehend the exact nature of binding and inhibition of ALR2 by vitamin K1 that could open up possibilities of its therapeutic application.
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Affiliation(s)
- R Thiagarajan
- School of Chemical & Biotechnology, SASTRA University, Tamil Nadu, India.
- Department of Advanced Zoology & Biotechnology, Ramakrishna Mission Vivekananda College, Mylapore, Chennai, 600004, India.
| | - M K N Sai Varsha
- Department of Biotechnology, Indian Institute of Technology, Madras, Chennai, 600036, India
| | - V Srinivasan
- Disease Program Lead - Diabetes, MedGenome Inc., Bangalore, India
| | - R Ravichandran
- Diabetes Research Program, Division of Endocrinology, Department of Medicine, NYU Langone Medical Center, New York, NY, 10016, USA
| | - K Saraboji
- School of Chemical & Biotechnology, SASTRA University, Tamil Nadu, India
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Ravichandran R, Itabachi Y, Bansal S, Liu W, Mohanakumar T. OR8 Novel mechanism by which antibodies to HLA molecules result in allograft rejection: Induction and release of immune-activating, circulating exosomes. Hum Immunol 2019. [DOI: 10.1016/j.humimm.2019.07.010] [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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Ravichandran R, Itabashi Y, Liu W, Mohanakumar T. miR-155 Plays an Essential Role in Anti-MHC-Induced Obliterative Airway Disease. J Heart Lung Transplant 2019. [DOI: 10.1016/j.healun.2019.01.619] [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: 11/25/2022] Open
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Ravichandran R, Bansal S, Rahman M, Sharma M, Liu W, Bharat A, Hachem R, Omar A, Smith MA, Mohanakumar T. The role of donor-derived exosomes in lung allograft rejection. Hum Immunol 2019; 80:588-594. [PMID: 30898684 DOI: 10.1016/j.humimm.2019.03.012] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [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: 02/01/2019] [Revised: 03/12/2019] [Accepted: 03/17/2019] [Indexed: 12/20/2022]
Abstract
Lung transplant recipients (LTxRs) with acute or chronic rejection release circulating exosomes that mostly originate from donor lung tissue and express mismatched human leucocyte antigens (HLA) and lung-associated self-antigens (SAgs), Collagen-V and K alpha 1 Tubulin. During lung transplant (LTx), donor lungs often undergo injuries that increase the antigenicity of the transplanted organ. 30% of LTxRs also have pre-transplant antibodies (Abs) to HLA and lung SAgs, which may induce conditions that increase the risk of chronic lung allograft dysfunction (CLAD). Post-transplant, some recipients experience de novo development of Abs to mismatched donor HLA (donor-specific antibody [DSA]) and Abs to lung SAgs, which have been implicated in CLAD pathogenesis. Because most LTxRs who develop DSA also develop Abs to SAgs, some have suggested a synergistic relationship between alloimmunity and autoimmunity in CLAD immunopathogenesis. These processes likely occur from stress-induced exosome release. Exosomes carry allo-antigens, lung SAgs, several micro RNAs, proteasome, co-stimulatory molecules, and pro-inflammatory transcription factors-resulting in efficient antigen presentation by direct, semidirect, and indirect pathways, leading to immune responses to both allo-antigens and lung-associated SAgs. This review summarizes recent findings on the role of exosomes, and processes triggering immune responses to allo-antigens and lung SAgs that ultimately culminate in CLAD.
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Affiliation(s)
| | - Sandhya Bansal
- Norton Thoracic Institute, St. Joseph's Hospital and Medical Center, Phoenix, AZ, United States
| | - Mohammad Rahman
- Norton Thoracic Institute, St. Joseph's Hospital and Medical Center, Phoenix, AZ, United States
| | - Monal Sharma
- Norton Thoracic Institute, St. Joseph's Hospital and Medical Center, Phoenix, AZ, United States
| | - Wei Liu
- Norton Thoracic Institute, St. Joseph's Hospital and Medical Center, Phoenix, AZ, United States
| | - Ankit Bharat
- Department of Surgery, Northwestern Feinberg School of Medicine, Chicago, IL, United States
| | - Ramsey Hachem
- Department of Internal Medicine, Washington University School of Medicine, St. Louis, MO, United States
| | - Ashraf Omar
- Norton Thoracic Institute, St. Joseph's Hospital and Medical Center, Phoenix, AZ, United States
| | - Michael A Smith
- Norton Thoracic Institute, St. Joseph's Hospital and Medical Center, Phoenix, AZ, United States
| | - T Mohanakumar
- Norton Thoracic Institute, St. Joseph's Hospital and Medical Center, Phoenix, AZ, United States.
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Sharma M, Ravichandran R, Bansal S, Bremner RM, Smith MA, Mohanakumar T. Tissue-associated self-antigens containing exosomes: Role in allograft rejection. Hum Immunol 2018; 79:653-658. [PMID: 29908844 PMCID: PMC6098724 DOI: 10.1016/j.humimm.2018.06.005] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [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: 03/01/2018] [Revised: 06/12/2018] [Accepted: 06/13/2018] [Indexed: 10/28/2022]
Abstract
Exosomes are extracellular vesicles that express self-antigens (SAgs) and donor human leukocyte antigens. Tissue-specific exosomes can be detected in the circulation following lung, heart, kidney and islet cell transplantations. We collected serum samples from patients who had undergone lung (n = 30), heart (n = 8), or kidney (n = 15) transplantations to isolate circulating exosomes. Exosome purity was analyzed by Western blot, using CD9 exosome-specific markers. Tissue-associated lung SAgs, collagen V (Col-V) and K-alpha 1 tubulin (Kα1T), heart SAgs, myosin and vimentin, and kidney SAgs, fibronectin and collagen IV (Col-IV), were identified using western blot. Lung transplant recipients diagnosed with bronchiolitis obliterans syndrome had exosomes with higher expression of Col-V (4.2-fold) and Kα1T (37.1-fold) than stable. Exosomes isolated from heart transplant recipients diagnosed with coronary artery vasculopathy had a 3.9-fold increase in myosin and a 4.7-fold increase in vimentin compared with stable. Further, Kidney transplant recipients diagnosed with transplant glomerulopathy had circulating exosomes with a 2-fold increased expression of fibronectin and 2.5-fold increase in Col-IV compared with stable. We conclude that circulating exosomes with tissue associated SAgs have the potential to be a noninvasive biomarker for allograft rejection.
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Affiliation(s)
- Monal Sharma
- Norton Thoracic Institute, St. Joseph's Hospital and Medical Center, Phoenix, AZ, USA
| | | | - Sandhya Bansal
- Norton Thoracic Institute, St. Joseph's Hospital and Medical Center, Phoenix, AZ, USA
| | - Ross M Bremner
- Norton Thoracic Institute, St. Joseph's Hospital and Medical Center, Phoenix, AZ, USA
| | - Michael A Smith
- Norton Thoracic Institute, St. Joseph's Hospital and Medical Center, Phoenix, AZ, USA
| | - T Mohanakumar
- Norton Thoracic Institute, St. Joseph's Hospital and Medical Center, Phoenix, AZ, USA.
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Ravichandran R, Martinez JG, Jager EWH, Phopase J, Turner APF. Type I Collagen-Derived Injectable Conductive Hydrogel Scaffolds as Glucose Sensors. ACS Appl Mater Interfaces 2018; 10:16244-16249. [PMID: 29701457 DOI: 10.1021/acsami.8b04091] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The advent of home blood glucose monitoring revolutionized diabetes management, and the recent introduction of both wearable devices and closed-loop continuous systems has enormously impacted the lives of people with diabetes. We describe the first fully injectable soft electrochemical glucose sensor for in situ monitoring. Collagen, the main component of a native extracellular matrix in humans and animals, was used to fabricate an in situ gellable self-supporting electroconductive hydrogel that can be injected onto an electrode surface or into porcine meat to detect glucose amperometrically. The study provides a proof-of-principle of an injectable electrochemical sensor suitable for monitoring tissue glucose levels that may, with further development, prove clinically useful in the future.
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Affiliation(s)
- Ranjithkumar Ravichandran
- Department of Physics, Chemistry and Biology (IFM) , Linköping University , SE-58183 , Linköping , Sweden
| | - Jose G Martinez
- Department of Physics, Chemistry and Biology (IFM) , Linköping University , SE-58183 , Linköping , Sweden
| | - Edwin W H Jager
- Department of Physics, Chemistry and Biology (IFM) , Linköping University , SE-58183 , Linköping , Sweden
| | - Jaywant Phopase
- Department of Physics, Chemistry and Biology (IFM) , Linköping University , SE-58183 , Linköping , Sweden
- Department of Science and Technology, Organic Electronics , Linköping University , Norrkoping SE-60174 , Sweden
| | - Anthony P F Turner
- Department of Physics, Chemistry and Biology (IFM) , Linköping University , SE-58183 , Linköping , Sweden
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Ravichandran R, Gunasekaran M, Bansal S, Mohanakumar T. Role of exosomes in rejection following human lung transplantation – an i n vitro analysis using human airway epithelial cells. The Journal of Immunology 2018. [DOI: 10.4049/jimmunol.200.supp.55.29] [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: 01/02/2023]
Abstract
Abstract
Studies have demonstrated that exosomes expressing donor human leukocyte antigen (HLA) and lung self-antigens (SAg), Collagen V (Col-V) and Kα1 Tubulin (Kα1T), can be detected in the circulation of human lung transplant recipients (LTxR) who developed antibodies (Ab) to donor HLA and diagnosed with rejection However, the mechanisms by which Ab mediate induction of exosomes into the circulation from airway epithelial cells (AEC) remains unclear. Ab ligation to HLA could enhance PERK-mediated pathways involved in endoplasmic reticular (ER) stress-dependent exosome release. The goal of this study is to determine the mechanism by which Ab induce exosomes from AEC. Towards this we employed human AEC, ligated antigens by Ab specific to HLA (HiPRA) and lung SAg (rabbit anti-Col-V or Kα1T) and the role of ER stress signaling molecule in exosomes release were determined. Effect of exosome inhibition by GW4869 was also analyzed. AEC were incubated with HiPRA or Ab to SAg for 24hr in both normoxia and hypoxia (0.1% O2) conditions. AEC incubated with HiPRA or Ab to SAg demonstrated induction of exosomes containing lung SAg, Col-V and Kα1T. Incubation with HiPRA and Ab (20μg/ml) to SAg also demonstrated induction of exosomes containing lung SAg, MHC class II, CD80, CD86. Treatment with GW4869, exosome inhibitor (20μM) reduced the exosomes and SAg. Effect of HiPRA and Ab to SAg on stress kinase in both normoxic and hypoxic conditions and influence of GW4869 in these pathways will be delineated. Identification of stress kinase and exosome inhibition will provide novel results for Ab mediated upregulation of stress leading to exosome release from the transplanted organ resulting in immune responses thus increasing the risk for chronic rejection following LTx.
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Joseph TM, Ravichandran R, Lylajam S, Viswabharan P, Janardhanan K, Rajeev S. Evaluation of positional accuracy in multiple implants using four different splinting materials: An in vitro study. J Indian Prosthodont Soc 2018; 18:239-247. [PMID: 30111913 PMCID: PMC6070859 DOI: 10.4103/jips.jips_27_18] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2018] [Accepted: 03/25/2018] [Indexed: 11/15/2022] Open
Abstract
Background: Prosthesis misfit plays an important role in complications such as occlusal and abutment screw loosening and fracture in implant restorations. Reproducing the intraoral relationship of implants through impression procedures is the first step in achieving an accurate, passively fitting prosthesis to ensure maximum accuracy. Hence, splinting of multiple implants with most accurate material may be a valid option. Context: The results of splinting multiple implants are always inconsistent, and there is limited literature available to compare the accuracy of impression techniques as well as materials. In such situation, more and more studies have to be done to prove the efficacy and accuracy of each splinting materials. Aim: The aim of the study was to evaluate the positional accuracy in multiple implants using acrylic resin, pattern resin, flowable composite, and bite registration paste. Subjects and Methods: An acrylic resin model was fabricated into which four implant analogs placed. The copings attached were splinted with dental floss onto which acrylic resin was added, which was sectioned and rewelded (Group A). Similarly, pattern resin, flowable composite, and bite registration material were added which were considered as Group B, C, and D, respectively. Impressions were made in vinyl polysiloxane and analogs were attached. The casts retrieved from each group were analysed for the positional accuracy of implants. Statistical Analysis: One-way ANOVA was done to analyze the significant difference between the four implant analogs of each group with the master model. The confidence interval was also calculated to assess the accuracy. Results: It was observed that all materials are equally effective for the accurate reproduction of implant positions. There was no significant difference between the centroids of implant analogues of master model and the mean of interimplant distance 1 and 2, 1 and 4, 3 and 4 and 2 and 4 in each group. The P-values were >0.05. The accuracy of splinting materials were analysed and it showed that splinting with flowable composite (Group C) as well as bite registration paste were in par with the conventionally used materials like pattern resin and acrylic resin. Conclusions: Results showed that flowable composite as well as bite registration material can be recommended as splinting material of choice for multiple implant cases, as these exhibited similar results like other groups (pattern resin and acrylic resin) which are conventionally used.
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Affiliation(s)
- Thara Maria Joseph
- Department of Prosthodontics, Government Dental College, Trivandrum, Kerala, India
| | - R Ravichandran
- Department of Prosthodontics, Government Dental College, Trivandrum, Kerala, India
| | - S Lylajam
- Department of Prosthodontics, Government Dental College, Trivandrum, Kerala, India
| | - Prasanth Viswabharan
- Department of Prosthodontics, Government Dental College, Trivandrum, Kerala, India
| | - Kavitha Janardhanan
- Department of Prosthodontics, Government Dental College, Trivandrum, Kerala, India
| | - Smitha Rajeev
- Department of Prosthodontics, Government Dental College, Trivandrum, Kerala, India
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Joseph TM, Ravichandran R, Harshakumar K, Lylajam S. Prosthetic rehabilitation in neurosurgical cranioplasty. J Indian Prosthodont Soc 2018; 18:76-81. [PMID: 29430147 PMCID: PMC5799974 DOI: 10.4103/jips.jips_136_17] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2017] [Accepted: 11/21/2017] [Indexed: 01/01/2023] Open
Abstract
The defects of the skull cause mechanical vulnerability of the brain, esthetic disfigurement, and transmission of vibrations and pulsation of the brain. Subsequent cranioplasty may be required to compensate for the defect and to alleviate various signs and symptoms. When long-term outcome of biomaterial use in pediatric cases is limited, alloplastic cranioplasty in adults are supported by several large case series. This case report narrates cranioplasty using titanium alloplastic implant material.
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Affiliation(s)
- Thara Maria Joseph
- Department of Prosthodontics, Government Dental College, Trivandrum, Kerala, India
| | - R Ravichandran
- Department of Prosthodontics, Government Dental College, Trivandrum, Kerala, India
| | - K Harshakumar
- Department of Prosthodontics, Government Dental College, Trivandrum, Kerala, India
| | - S Lylajam
- Department of Prosthodontics, Government Dental College, Trivandrum, Kerala, India
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Ravichandran R, Islam MM, Alarcon EI, Samanta A, Wang S, Lundström P, Hilborn J, Griffith M, Phopase J. Correction: Functionalised type-I collagen as a hydrogel building block for bio-orthogonal tissue engineering applications. J Mater Chem B 2017; 5:5284. [PMID: 32264115 DOI: 10.1039/c7tb90075a] [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: 11/21/2022]
Abstract
Correction for 'Functionalised type-I collagen as a hydrogel building block for bio-orthogonal tissue engineering applications' by R. Ravichandran et al., J. Mater. Chem. B, 2016, 4, 318-326.
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Affiliation(s)
- R Ravichandran
- Integrative Regenerative Medicine Centre (IGEN) and Division of Molecular Physics, Department of Physics, Chemistry and Biology (IFM), Linköping University, S-58183, Linköping, Sweden.
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Poblete H, Agarwal A, Thomas SS, Bohne C, Ravichandran R, Phopase J, Comer J, Alarcon EI. Correction to "New Insights into Peptide-Silver Nanoparticle Interaction: Deciphering the Role of Cysteine and Lysine in the Peptide Sequence". Langmuir 2017; 33:5973. [PMID: 28558219 DOI: 10.1021/acs.langmuir.7b01545] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
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Jin X, Pan Y, Wang L, Zhang L, Ravichandran R, Potts PR, Jiang J, Wu H, Huang H. MAGE-TRIM28 complex promotes the Warburg effect and hepatocellular carcinoma progression by targeting FBP1 for degradation. Oncogenesis 2017; 6:e312. [PMID: 28394358 PMCID: PMC5520498 DOI: 10.1038/oncsis.2017.21] [Citation(s) in RCA: 82] [Impact Index Per Article: 11.7] [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: 11/10/2016] [Revised: 01/25/2017] [Accepted: 02/27/2017] [Indexed: 01/16/2023] Open
Abstract
Hepatocellular carcinoma (HCC) is one of the leading cause of cancer death in the world. Fructose-1,6-biphosphatase (FBP1), a rate-limiting enzyme in gluconeogenesis, has been identified recently as a tumor suppressor in HCC and other cancer types. In this study, we demonstrated that the tripartite motif-containing protein 28 (TRIM28) binds directly to and promotes FBP1 for ubiquitination and degradation. MAGE-A3 and MAGE-C2, which are known to be overexpressed in HCC, can enhance TRIM28-dependent degradation of FBP1 by forming ubiquitin ligase complexes with TRIM28. We further showed that expression of TRIM28 increased glucose consumption and lactate production by promoting FBP1 degradation in HCC cells and that FBP1 is a key mediator of TRIM28-induced HCC growth in culture and in mice. Moreover, we demonstrated that FBP1 and TRIM28 protein levels inversely correlated in HCC patient specimens. Finally, we showed that the proteasome inhibitor bortezomib mitigated the Warburg effect by inhibiting FBP1 degradation in HCC. Collectively, our findings not only identify oncogenic MAGE-TRIM28 complex-mediated proteasome degradation of FBP1 as a key mechanism underlying downregulation of FBP1 proteins in HCC, but also reveal that MAGE-TRIM28-regulated reprogramming of cancer cell metabolism and HCC tumorigenesis is mediated, at least in part, through FBP1 degradation.
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Affiliation(s)
- X Jin
- Department of Digestive Surgical Oncology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China.,Department of Biochemistry and Molecular Biology, Mayo Clinic College of Medicine, Rochester, MN, USA
| | - Y Pan
- Department of Biochemistry and Molecular Biology, Mayo Clinic College of Medicine, Rochester, MN, USA
| | - L Wang
- Department of Medical Informatics and Statistics, Mayo Clinic College of Medicine, Rochester, MN, USA
| | - L Zhang
- Department of Laboratory Medicine and Pathology, Mayo Clinic College of Medicine, Rochester, MN, USA
| | - R Ravichandran
- Department of Cell and Molecular Biology, St. Jude Children's Research Hospital, Memphis, TN, USA
| | - P R Potts
- Department of Cell and Molecular Biology, St. Jude Children's Research Hospital, Memphis, TN, USA
| | - J Jiang
- Department of Tumor Biological Treatment, The Third Affiliated Hospital of Soochow University, Changzhou, China
| | - H Wu
- Department of Pancreatic Surgery, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - H Huang
- Department of Biochemistry and Molecular Biology, Mayo Clinic College of Medicine, Rochester, MN, USA.,Department of Urology, Mayo Clinic College of Medicine, Rochester, MN, USA.,Mayo Clinic Cancer Center, Mayo Clinic College of Medicine, Rochester, MN, USA
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Ravichandran R, Astrand C, Patra HK, Turner APF, Chotteau V, Phopase J. Intelligent ECM mimetic injectable scaffolds based on functional collagen building blocks for tissue engineering and biomedical applications. RSC Adv 2017. [DOI: 10.1039/c7ra02927f] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A one-pot approach to fabricate in situ-gellable, thermo- and pH-responsive, hydrogels based on covalently crosslinked networks of collagen-I and thermo-responsive polymer.
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Affiliation(s)
- R. Ravichandran
- Division of Molecular Physics
- Department of Physics, Chemistry and Biology (IFM)
- Linköping University
- Linköping
- Sweden
| | - C. Astrand
- School of Biotechnology
- KTH-Royal Institute of Technology
- Stockholm
- Sweden
| | - H. K. Patra
- Biosensors and Bioelectronics Centre
- Department of Physics
- Chemistry and Biology (IFM)
- Linköping University
- Linköping
| | - Anthony P. F. Turner
- Biosensors and Bioelectronics Centre
- Department of Physics
- Chemistry and Biology (IFM)
- Linköping University
- Linköping
| | - V. Chotteau
- School of Biotechnology
- KTH-Royal Institute of Technology
- Stockholm
- Sweden
| | - J. Phopase
- Division of Molecular Physics
- Department of Physics, Chemistry and Biology (IFM)
- Linköping University
- Linköping
- Sweden
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Gopalan R, Nair V, Harshakumar K, Ravichandran R, Lylajam S, Viswambaran P. A comparative evaluation of the marginal adaptation of a thermoplastic resin, a light cured wax and an inlay casting wax on stone dies: An in vitro study. J Indian Prosthodont Soc 2017; 18:3-9. [PMID: 29430135 PMCID: PMC5799966 DOI: 10.4103/jips.jips_70_17] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2017] [Accepted: 09/22/2017] [Indexed: 12/04/2022] Open
Abstract
Background: Different pattern materials do not produce copings with satisfactory, marginal accuracy when used on stone dies at varying time intervals. Purpose: The purpose of this study was to evaluate and compare the vertical marginal accuracy of patterns formed from three materials, namely, thermoplastic resin, light cured wax and inlay casting wax at three-time intervals of 1, 12, and 24 h. Methodology: A master die (zirconia abutment mimicking a prepared permanent maxillary central incisor) and metal sleeve (direct metal laser sintering crown #11) were fabricated. A total of 30 stone dies were obtained from the master die. Ten patterns were made each from the three materials and stored off the die at room temperature. The vertical marginal gaps were measured using digital microscope at 1, 12, and 24 h after reseating with gentle finger pressure. Results: The results revealed a significant statistical difference in the marginal adaptation of three materials at all the three-time intervals. Light cured wax was found to be most accurate at all time intervals, followed by thermoplastic resin and inlay casting wax. Furthermore, there was a significant difference between all pairs of materials. The change in vertical marginal gap from 1 to 24 h between thermoplastic resin and light cured wax was not statistically significant. Conclusion: The marginal adaptation of all the three materials used, was well within the acceptable range of 25–70 μm. The resin pattern materials studied revealed significantly less dimensional change than inlay casting wax on storage at 1, 12, and 24 h time intervals. They may be employed in situations where high precision and delayed investing is expected.
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Sathiyan S, Ravikumar M, Ravichandran R. An analysis of personnel dose reports in medical radiation occupational workers from an oncology center. INT J RADIAT RES 2016. [DOI: 10.18869/acadpub.ijrr.14.2.143] [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: 11/09/2022]
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Alarcon EI, Vulesevic B, Argawal A, Ross A, Bejjani P, Podrebarac J, Ravichandran R, Phopase J, Suuronen EJ, Griffith M. Coloured cornea replacements with anti-infective properties: expanding the safe use of silver nanoparticles in regenerative medicine. Nanoscale 2016; 8:6484-6489. [PMID: 26949000 DOI: 10.1039/c6nr01339b] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Despite the broad anti-microbial and anti-inflammatory properties of silver nanoparticles (AgNPs), their use in bioengineered corneal replacements or bandage contact lenses has been hindered due to their intense yellow coloration. In this communication, we report the development of a new strategy to pre-stabilize and incorporate AgNPs with different colours into collagen matrices for fabrication of corneal implants and lenses, and assessed their in vitro and in vivo activity.
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Affiliation(s)
- E I Alarcon
- Bio-nanomaterials Chemistry and Engineering Laboratory, Division of Cardiac Surgery, University of Ottawa Heart Institute, 40 Ruskin Street, Rm H5229, Ottawa, Canada
| | - B Vulesevic
- Bio-nanomaterials Chemistry and Engineering Laboratory, Division of Cardiac Surgery, University of Ottawa Heart Institute, 40 Ruskin Street, Rm H5229, Ottawa, Canada
| | - A Argawal
- Bio-nanomaterials Chemistry and Engineering Laboratory, Division of Cardiac Surgery, University of Ottawa Heart Institute, 40 Ruskin Street, Rm H5229, Ottawa, Canada
| | - A Ross
- Bio-nanomaterials Chemistry and Engineering Laboratory, Division of Cardiac Surgery, University of Ottawa Heart Institute, 40 Ruskin Street, Rm H5229, Ottawa, Canada
| | - P Bejjani
- Bio-nanomaterials Chemistry and Engineering Laboratory, Division of Cardiac Surgery, University of Ottawa Heart Institute, 40 Ruskin Street, Rm H5229, Ottawa, Canada
| | - J Podrebarac
- Bio-nanomaterials Chemistry and Engineering Laboratory, Division of Cardiac Surgery, University of Ottawa Heart Institute, 40 Ruskin Street, Rm H5229, Ottawa, Canada
| | - R Ravichandran
- Department of Physics, Chemistry and Biology, Linköping University, SE 581 83 Linköping, Sweden
| | - J Phopase
- Department of Physics, Chemistry and Biology, Linköping University, SE 581 83 Linköping, Sweden
| | - E J Suuronen
- Bio-nanomaterials Chemistry and Engineering Laboratory, Division of Cardiac Surgery, University of Ottawa Heart Institute, 40 Ruskin Street, Rm H5229, Ottawa, Canada
| | - M Griffith
- Integrative Regenerative Medicine Centre, Department of Clinical and Experimental Medicine, Linköping University, Linköping, Sweden.
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Poblete H, Agarwal A, Thomas SS, Bohne C, Ravichandran R, Phopase J, Comer J, Alarcon EI. New Insights into Peptide-Silver Nanoparticle Interaction: Deciphering the Role of Cysteine and Lysine in the Peptide Sequence. Langmuir 2016; 32:265-273. [PMID: 26675437 DOI: 10.1021/acs.langmuir.5b03601] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
We studied the interaction of four new pentapeptides with spherical silver nanoparticles. Our findings indicate that the combination of the thiol in Cys and amines in Lys/Arg residues is critical to providing stable protection for the silver surface. Molecular simulation reveals the atomic scale interactions that underlie the observed stabilizing effect of these peptides, while yielding qualitative agreement with experiment for ranking the affinity of the four pentapeptides for the silver surface.
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Affiliation(s)
- Horacio Poblete
- Institute of Computational Comparative Medicine, Nanotechnology Innovation Center of Kansas State, and Department of Anatomy and Physiology, Kansas State University , Manhattan, Kansas 66506-5802, United States
| | - Anirudh Agarwal
- Bio-nanomaterials Chemistry and Engineering Laboratory, Cardiac Surgery Research, University of Ottawa Heart Institute , Ottawa, ON K1Y 4W7, Canada
| | - Suma S Thomas
- Department of Chemistry, University of Victoria , Victoria, BC V8W 3V6, Canada
| | - Cornelia Bohne
- Department of Chemistry, University of Victoria , Victoria, BC V8W 3V6, Canada
| | | | - Jaywant Phopase
- Department of Physics, Chemistry and Biology, Linköping University , SE 581 83 Linköping, Sweden
| | - Jeffrey Comer
- Institute of Computational Comparative Medicine, Nanotechnology Innovation Center of Kansas State, and Department of Anatomy and Physiology, Kansas State University , Manhattan, Kansas 66506-5802, United States
| | - Emilio I Alarcon
- Bio-nanomaterials Chemistry and Engineering Laboratory, Cardiac Surgery Research, University of Ottawa Heart Institute , Ottawa, ON K1Y 4W7, Canada
- Department of Biochemistry, Microbiology and Immunology, Faculty of Medicine, University of Ottawa , Ottawa, ON K1Y 4W7, Canada
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Islam MM, Ravichandran R, Olsen D, Ljunggren MK, Fagerholm P, Lee CJ, Griffith M, Phopase J. Self-assembled collagen-like-peptide implants as alternatives to human donor corneal transplantation. RSC Adv 2016. [DOI: 10.1039/c6ra08895c] [Citation(s) in RCA: 55] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
PEG-conjugated collagen-like peptides promote corneal regeneration in a pig cornea.
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Affiliation(s)
- M. Mirazul Islam
- Swedish Medical Nanoscience Center
- Dept. of Neurosciences
- Karolinska Institutet
- S-17177 Stockholm
- Sweden
| | - R. Ravichandran
- Dept. of Physics
- Chemistry and Biology (IFM)
- Linköping University
- S-58183 Linköping
- Sweden
| | - D. Olsen
- FibroGen Incorporated
- San Francisco
- USA
| | - M. K. Ljunggren
- Dept. of Clinical and Experimental Medicine
- Linköping University
- S-58185 Linköping
- Sweden
| | - Per Fagerholm
- Dept. of Clinical and Experimental Medicine
- Linköping University
- S-58185 Linköping
- Sweden
| | - C. J. Lee
- Dept. of Clinical and Experimental Medicine
- Linköping University
- S-58185 Linköping
- Sweden
- Dept. of Physics
| | - M. Griffith
- Swedish Medical Nanoscience Center
- Dept. of Neurosciences
- Karolinska Institutet
- S-17177 Stockholm
- Sweden
| | - J. Phopase
- Dept. of Physics
- Chemistry and Biology (IFM)
- Linköping University
- S-58183 Linköping
- Sweden
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Ravichandran R, Islam MM, Alarcon EI, Samanta A, Wang S, Lundström P, Hilborn J, Griffith M, Phopase J. Functionalised type-I collagen as a hydrogel building block for bio-orthogonal tissue engineering applications. J Mater Chem B 2016; 4:318-326. [DOI: 10.1039/c5tb02035b] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Modulating the hydrogel properties from injectable to implantable scaffolds using the bio-orthogonal thiol-Michael addition click reaction.
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Affiliation(s)
- R. Ravichandran
- Integrative Regenerative Medicine Centre (IGEN) and Division of Molecular Physics
- Department of Physics
- Chemistry and Biology (IFM)
- Linköping University
- Linköping
| | - M. M. Islam
- Integrative Regenerative Medicine Centre (IGEN) and Swedish Medical Nanoscience Center
- Department of Neurosciences
- Karolinska Institutet
- Stockholm
- Sweden
| | - E. I. Alarcon
- Division of Cardiac Surgery Research
- University of Ottawa Heart Institute
- Ottawa
- Canada
- Department of Biochemistry
| | - A. Samanta
- Integrative Regenerative Medicine Centre and Department of Clinical and Experimental Medicine (IKE)
- Linköping University
- Linköping
- Sweden
| | - S. Wang
- Polymer Chemistry Division
- Department of Chemistry
- Ångstrom Laboratory
- Uppsala University
- 75121 Uppsala
| | - P. Lundström
- Division of Chemistry
- Department of Physics
- Chemistry and Biology (IFM)
- Linköping University
- Linköping
| | - J. Hilborn
- Polymer Chemistry Division
- Department of Chemistry
- Ångstrom Laboratory
- Uppsala University
- 75121 Uppsala
| | - M. Griffith
- Integrative Regenerative Medicine Centre and Department of Clinical and Experimental Medicine (IKE)
- Linköping University
- Linköping
- Sweden
| | - J. Phopase
- Integrative Regenerative Medicine Centre (IGEN) and Division of Molecular Physics
- Department of Physics
- Chemistry and Biology (IFM)
- Linköping University
- Linköping
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Ravichandran R, Hemaasri S, Cameotra SS, Jayaprakash N. Purification and characterization of an extracellular uricase from a new isolate of Sphingobacterium thalpophilum (VITPCB5). Protein Expr Purif 2015; 114:136-42. [DOI: 10.1016/j.pep.2015.06.017] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2015] [Revised: 06/23/2015] [Accepted: 06/25/2015] [Indexed: 10/23/2022]
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Ravichandran R, Vikram HN, Murali TR, Sampathkumar K. Modified technique of continuous ambulatory peritoneal dialysis catheter insertion in the pediatric population. J Pediatr Urol 2014; 10:1277-9. [PMID: 25096171 DOI: 10.1016/j.jpurol.2014.07.001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/19/2014] [Accepted: 07/03/2014] [Indexed: 11/16/2022]
Abstract
OBJECTIVES To assess whether placement of a superficial cuff deeper to the external oblique aponeurosis reduces cuff extrusion and exit site infection in peritoneal catheter insertion in children. MATERIAL AND METHODS In 2013, a total of fourteen children underwent open continuous ambulatory peritoneal dialysis catheter insertion using Tenckhoff double cuffed catheters. The initial eight patients underwent a conventional technique and developed exit site infection and cuff extrusion. In six other patients, the technique was modified by placing the superficial cuff deeper to the external oblique aponeurosis. RESULTS In the former group, three patients developed cuff extrusion, whilst none developed it in the latter, modified group. CONCLUSION Continuous ambulatory peritoneal dialysis catheter insertion in children is associated with superficial cuff extrusion as a complication. It can be prevented by placing the cuff deeper to the external oblique aponeurosis instead of placing it in the conventional subcutaneous plane. In early experiences with this innovative technique, results have been promising. Randomized controlled trials can thus be undertaken to strengthen this finding.
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Affiliation(s)
- R Ravichandran
- Department of Urology, Meenakshi Mission Hospital and Research Centre, Lake Area, Melur Road, Madurai 625107, Tamil Nadu, India.
| | - H N Vikram
- Department of Urology, Meenakshi Mission Hospital and Research Centre, Lake Area, Melur Road, Madurai 625107, Tamil Nadu, India.
| | - T R Murali
- Department of Urology, Meenakshi Mission Hospital and Research Centre, Lake Area, Melur Road, Madurai 625107, Tamil Nadu, India.
| | - K Sampathkumar
- Department of Nephrology, Meenakshi Mission Hospital and Research Centre, Lake Area, Melur Road, Madurai 625107, Tamil Nadu, India.
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Sham S, Rajeswari S, Ravichandran R, Madheshwaran M. A rare presentation of childhood Takayasu's arteritis – PRES. Indian Journal of Rheumatology 2014. [DOI: 10.1016/j.injr.2014.04.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022] Open
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Ravichandran R, Aarthipriya T, Ramesh S, Selvaraj L, Devi C, Anand MV. Cutaneous manifestations of rheumatoid arthritis. Indian Journal of Rheumatology 2014. [DOI: 10.1016/j.injr.2014.10.067] [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: 11/25/2022] Open
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Ravichandran R, Griffith M, Phopase J. Applications of self-assembling peptide scaffolds in regenerative medicine: the way to the clinic. J Mater Chem B 2014; 2:8466-8478. [PMID: 32262205 DOI: 10.1039/c4tb01095g] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Peptides that self-assemble into well-defined nanofibrous networks provide a prominent alternative to traditional biomaterials for fabricating scaffolds for use in regenerative medicine and other biomedical applications. Such scaffolds can be generated by decorating a peptide backbone with other bioactives such as cell specific adhesion peptides, growth factors and enzyme cleavable sequences. They can be designed to mimic the three-dimensional (3D) structural features of native ECM and can therefore also provide insight into the ECM-cell interactions needed for development of scaffolds that can serve as regeneration templates for specific target tissues or organs. This review highlights the potential application of self-assembling peptides in regenerative medicine.
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Affiliation(s)
- Ranjithkumar Ravichandran
- Integrative Regenerative Medicine (IGEN) Centre and Division of Molecular Physics, Department of Physics, Chemistry and Biology(IFM), Linköping University, S-58183 Linköping, Sweden.
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