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Nikitas J, Subramanian K, Proudfoot J, Davicioni E, Ricaurte-Fajardo A, Armstrong WR, Czernin J, Osborne JR, Marciscano AE, Smith CP, Valle L, Steinberg ML, Boutros P, Rettig M, Reiter RE, Weiner A, Barbieri CE, Calais J, Nagar H, Kishan AU. Predictive Value of Genomic Classifier Scores and Transcriptomic Data for Prostate Cancer Distant Metastasis Risk: A Multicenter Retrospective Study. Int J Radiat Oncol Biol Phys 2023; 117:e423-e424. [PMID: 37785390 DOI: 10.1016/j.ijrobp.2023.06.1581] [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: 10/04/2023]
Abstract
PURPOSE/OBJECTIVE(S) Prostate-specific membrane antigen (PSMA) positron emission tomography (PET) has a greater specificity and sensitivity for detection of extraprostatic prostate cancer than conventional imaging. The Decipher genomic classifier is an established prognostic biomarker being evaluated for its ability to predict systemic treatment intensification. The relationship between Decipher scores and PSMA-based spread remains unknown, as do differences in transcriptomic patterns of PSMA PET-based spread in the de novo vs. recurrent setting. MATERIALS/METHODS We retrospectively identified patients who (a) had undergone staging with a PSMA PET prior to treatment or for evaluation of recurrence post-radical prostatectomy (RP) at two institutions and (b) had transcriptomic data available from the Genomics Resource for Intelligent Discovery (GRID) database from either biopsy or RP specimens. We classified the PSMA PET pattern of spread using molecular imaging (mi) staging as localized (miT+N0M0), node-positive (miN1M0), distant metastasis (miM1a-c), or negative/non-diagnostic. We used logistic regression to calculate the odds ratios (OR) with 95% confidence intervals (CI) for distant metastasis risk based on Decipher score both pre-treatment and post-RP. As an exploratory analysis, we compared each of the staging groups for differences in important transcriptomic signatures. Kruskal-Wallis and Pearson chi-squared tests were used for continuous and categorical variables, respectively. RESULTS A total of 315 patients were included in this analysis (n = 164 pre-treatment, n = 151 post-RP). Eighty PSMA PET scans were negative, while 147 were miT+N0M0, 45 were miN1M0, and 43 were miM1a-c. A higher Decipher score was associated with distant metastasis (miM1a-c) on PSMA PET both pre-treatment (OR 1.3 [95% CI: 1.0-1.7] per 0.1 increase in Decipher score, P = 0.05) and post-RP (OR 1.2 [1.0-1.4] per 0.1 increase in Decipher score, P = 0.04). There were higher TP53 mutation (P = 0.01) and cell cycle progression (P = 0.04) signature scores in miM1a-c patients compared to miN1M0 or miT+N0M0 patients. Basal subtype was more prevalent per PAM50 in miM1a-c or miN1M0 patients (36%) than miT+N0M0 patients (19%, P=0.01). Patients with de novo miN1M0 or miM1a disease (n = 19) had higher Decipher scores (0.85 vs 0.57, P = 0.10) and IFNa response (P = 0.08) than patients with recurrent miN1M0 or miM1a disease (n = 35). CONCLUSION Higher Decipher scores were associated with distant metastasis on PSMA PET in both the de novo and recurrent setting. Transcriptomic differences in pathways related to proliferation, p53 status, and PAM50 classification were seen when comparing localized, node-positive, and distant metastatic disease. Patients with de novo miN1M0 or miM1a disease may harbor more aggressive disease than those with miN1M0 or miM1a disease at recurrence.
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Affiliation(s)
- J Nikitas
- Department of Radiation Oncology, University of California, Los Angeles, Los Angeles, CA
| | - K Subramanian
- Department of Nuclear Medicine, New York-Presbyterian/Weill Cornell Hospital, New York, NY
| | | | | | - A Ricaurte-Fajardo
- Department of Radiology, New York-Presbyterian/Weill Cornell Hospital, New York, NY
| | - W R Armstrong
- Ahmanson Translational Theranostics Division, UCLA Nuclear Medicine, Los Angeles, CA
| | - J Czernin
- Ahmanson Translational Theranostics Division, UCLA Nuclear Medicine, Los Angeles, CA
| | - J R Osborne
- Department of Radiology, New York-Presbyterian/Weill Cornell Medical Center, New York, NY
| | - A E Marciscano
- Department of Radiation Oncology, New York-Presbyterian Hospital / Weill Cornell Medical College, New York, NY
| | - C P Smith
- Department of Radiation Oncology, University of California, Los Angeles, Los Angeles, CA
| | - L Valle
- Department of Radiation Oncology, University of California, Los Angeles, Los Angeles, CA
| | - M L Steinberg
- Department of Radiation Oncology, University of California, Los Angeles, Los Angeles, CA
| | - P Boutros
- Department of Urology, University of California, Los Angeles, Los Angeles, CA
| | - M Rettig
- Department of Urology, University of California, Los Angeles, Los Angeles, CA
| | - R E Reiter
- Department of Urology, University of California, Los Angeles, Los Angeles, CA
| | - A Weiner
- Department of Urology, University of California, Los Angeles, Los Angeles, CA
| | - C E Barbieri
- Department of Urology, New York-Presbyterian/Weill Cornell Medical Center, New York, NY
| | - J Calais
- Ahmanson Translational Theranostics Division, UCLA Nuclear Medicine, Los Angeles, CA
| | - H Nagar
- Department of Radiation Oncology, New York-Presbyterian/Weill Cornell Hospital, New York, NY
| | - A U Kishan
- Department of Radiation Oncology, University of California, Los Angeles, Los Angeles, CA
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Subramanian K, Banerjee A. Editorial: Deceiving the host: mechanisms of immune evasion and survival by pneumococcal bacteria. Front Cell Infect Microbiol 2023; 13:1231253. [PMID: 37404724 PMCID: PMC10315915 DOI: 10.3389/fcimb.2023.1231253] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2023] [Accepted: 06/09/2023] [Indexed: 07/06/2023] Open
Affiliation(s)
- Karthik Subramanian
- Pathogen Biology Division, Rajiv Gandhi Centre for Biotechnology, Thiruvananthapuram, Kerala, India
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Subramanian K, Krishnakumar R. 8801 Safe Hysteroscopic Management of Caesarean Scar Pregnancy. J Minim Invasive Gynecol 2022. [DOI: 10.1016/j.jmig.2022.09.489] [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]
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Coffman CH, White R, Subramanian K, Buch S, Bernitsas E, Haacke EM. Quantitative susceptibility mapping of both ring and non-ring white matter lesions in relapsing remitting multiple sclerosis. Magn Reson Imaging 2022; 91:45-51. [DOI: 10.1016/j.mri.2022.05.009] [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: 11/23/2021] [Revised: 05/12/2022] [Accepted: 05/16/2022] [Indexed: 11/25/2022]
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Subramanian K, Bavinck M, Scholtens J, Hapke HM, Jyotishi A. How Seafood Wholesale Markets Matter for Urban Food Security: Evidence from Chennai, India. Eur J Dev Res 2022; 35:579-601. [PMID: 35309113 PMCID: PMC8917331 DOI: 10.1057/s41287-022-00519-z] [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] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Accepted: 01/10/2022] [Indexed: 05/27/2023]
Abstract
Urban sites gather poverty in particular locations and often require bulk food system approaches for addressing prevalent food security and nutrition needs. The food systems that service them are, however, characterized by perishability and large irregularities in supply. Seafood is currently recognized as contributing in a major way to food security and nutrition, and it is to assessing the role of wholesale markets in meeting the needs of the urban poor that this paper is directed. It zooms in on the city of Chennai, India, where an estimated 40% of the population is considered poor and marine fish plays a crucial role in diets. Building on one-and-a-half years of field research in the pre-COVID-19 period, the paper analyses the performance of one of the city's largest fish wholesale markets, Vanagaram, in relation to the four commonly recognized pillars of food security. Results demonstrate how urban food systems function as major suppliers of fish (and other food items) to thousands of low- and middle-income households. Most importantly, this case study demonstrates the crucial role that is played by wholesale markets in merging low-price fish supplies from different geographic regions and thereby ensuring food security of poorer inhabitants.
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Affiliation(s)
| | - M. Bavinck
- Arctic University of Norway, University of Amsterdam, Amsterdam, Netherlands
| | | | - H. M. Hapke
- University of California, Irvine, Irvine, USA
| | - A. Jyotishi
- School of Development, Azim Premji University, Bengaluru, India
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Parveen S, Subramanian K. Emerging Roles of Extracellular Vesicles in Pneumococcal Infections: Immunomodulators to Potential Novel Vaccine Candidates. Front Cell Infect Microbiol 2022; 12:836070. [PMID: 35237534 PMCID: PMC8882830 DOI: 10.3389/fcimb.2022.836070] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2021] [Accepted: 01/24/2022] [Indexed: 11/13/2022] Open
Abstract
The Gram-positive bacterial pathogen, Streptococcus pneumoniae is a major global health threat that kills over one million people worldwide. The pneumococcus commonly colonizes the nasopharynx asymptomatically as a commensal, but is also capable of causing a wide range of life-threatening diseases such as pneumonia, meningitis and septicemia upon migration into the lower respiratory tract and spread to internal organs. Emergence of antibiotic resistant strains and non-vaccine serotypes has led to the classification of pneumococcal bacteria as a priority pathogen by the World Health Organization that needs urgent research into bacterial pathogenesis and development of novel vaccine strategies. Extracellular vesicles are spherical membrane bound structures that are released by both pathogen and host cells, and influence bacterial pathogenesis as well as the immune response. Recent studies have found that while bacterial vesicles shuttle virulence factors and toxins into host cells and regulate inflammatory responses, vesicles released from the infected host cells contain both bacterial and host proteins that are antigenic and immunomodulatory. Bacterial membrane vesicles have great potential to be developed as cell-free vaccine candidates in the future due to their immunogenicity and biostability. Host-derived vesicles isolated from patient biofluids such as blood and bronchoalveolar lavage could be used to identify potential diagnostic biomarkers as well as engineered to deliver desired payloads to specific target cells for immunotherapy. In this review, we summarize the recent developments on the role of bacterial and host vesicles in pneumococcal infections and future prospects in developing novel therapeutics and diagnostics for control of invasive pneumococcal diseases.
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Haacke EM, Bernitsas E, Subramanian K, Utriainen D, Palutla VK, Yerramsetty K, Kumar P, Sethi SK, Chen Y, Latif Z, Jella P, Gharabaghi S, Wang Y, Zhang X, Comley RA, Beaver J, Luo Y. A Comparison of Magnetic Resonance Imaging Methods to Assess Multiple Sclerosis Lesions: Implications for Patient Characterization and Clinical Trial Design. Diagnostics (Basel) 2021; 12:diagnostics12010077. [PMID: 35054244 PMCID: PMC8775217 DOI: 10.3390/diagnostics12010077] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [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: 11/02/2021] [Revised: 12/20/2021] [Accepted: 12/22/2021] [Indexed: 11/16/2022] Open
Abstract
Magnetic resonance imaging (MRI) is a sensitive imaging modality for identifying inflammatory and/or demyelinating lesions, which is critical for a clinical diagnosis of MS and evaluating drug responses. There are many unique means of probing brain tissue status, including conventional T1 and T2 weighted imaging (T1WI, T2WI), T2 fluid attenuated inversion recovery (FLAIR), magnetization transfer, myelin water fraction, diffusion tensor imaging (DTI), phase-sensitive inversion recovery and susceptibility weighted imaging (SWI), but no study has combined all of these modalities into a single well-controlled investigation. The goals of this study were to: compare different MRI measures for lesion visualization and quantification; evaluate the repeatability of various imaging methods in healthy controls; compare quantitative susceptibility mapping (QSM) with myelin water fraction; measure short-term longitudinal changes in the white matter of MS patients and map out the tissue properties of the white matter hyperintensities using STAGE (strategically acquired gradient echo imaging). Additionally, the outcomes of this study were anticipated to aid in the choice of an efficient imaging protocol reducing redundancy of information and alleviating patient burden. Of all the sequences used, T2 FLAIR and T2WI showed the most lesions. To differentiate the putative demyelinating lesions from inflammatory lesions, the fusion of SWI and T2 FLAIR was used. Our study suggests that a practical and efficient imaging protocol combining T2 FLAIR, T1WI and STAGE (with SWI and QSM) can be used to rapidly image MS patients to both find lesions and study the demyelinating and inflammatory characteristics of the lesions.
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Affiliation(s)
- Ewart Mark Haacke
- The MRI Institute for Biomedical Research, Bingham Farms, MI 48025, USA; (D.U.); (S.K.S.)
- Department of Radiology, Wayne State University, Detroit, MI 48201, USA; (K.S.); (Z.L.); (P.J.); (Y.W.)
- Department of Neurology, Wayne State University, Detroit, MI 48201, USA; (E.B.); (Y.C.)
- SpinTech Inc., Bingham Farms, MI 48025, USA
- MR Innovations Inc., Bingham Farms, MI 48025, USA;
- Correspondence:
| | - Evanthia Bernitsas
- Department of Neurology, Wayne State University, Detroit, MI 48201, USA; (E.B.); (Y.C.)
| | - Karthik Subramanian
- Department of Radiology, Wayne State University, Detroit, MI 48201, USA; (K.S.); (Z.L.); (P.J.); (Y.W.)
| | - David Utriainen
- The MRI Institute for Biomedical Research, Bingham Farms, MI 48025, USA; (D.U.); (S.K.S.)
- SpinTech Inc., Bingham Farms, MI 48025, USA
| | - Vinay Kumar Palutla
- MR Medical Imaging Innovations India Pvt. Ltd., Hyderabad 500081, India; (V.K.P.); (K.Y.); (P.K.)
| | - Kiran Yerramsetty
- MR Medical Imaging Innovations India Pvt. Ltd., Hyderabad 500081, India; (V.K.P.); (K.Y.); (P.K.)
| | - Prashanth Kumar
- MR Medical Imaging Innovations India Pvt. Ltd., Hyderabad 500081, India; (V.K.P.); (K.Y.); (P.K.)
| | - Sean K. Sethi
- The MRI Institute for Biomedical Research, Bingham Farms, MI 48025, USA; (D.U.); (S.K.S.)
- Department of Radiology, Wayne State University, Detroit, MI 48201, USA; (K.S.); (Z.L.); (P.J.); (Y.W.)
- SpinTech Inc., Bingham Farms, MI 48025, USA
| | - Yongsheng Chen
- Department of Neurology, Wayne State University, Detroit, MI 48201, USA; (E.B.); (Y.C.)
| | - Zahid Latif
- Department of Radiology, Wayne State University, Detroit, MI 48201, USA; (K.S.); (Z.L.); (P.J.); (Y.W.)
| | - Pavan Jella
- Department of Radiology, Wayne State University, Detroit, MI 48201, USA; (K.S.); (Z.L.); (P.J.); (Y.W.)
| | | | - Ying Wang
- Department of Radiology, Wayne State University, Detroit, MI 48201, USA; (K.S.); (Z.L.); (P.J.); (Y.W.)
- MR Innovations Inc., Bingham Farms, MI 48025, USA;
| | - Xiaomeng Zhang
- AbbVie Inc., North Chicago, IL 60064, USA; (X.Z.); (R.A.C.); (J.B.); (Y.L.)
| | - Robert A. Comley
- AbbVie Inc., North Chicago, IL 60064, USA; (X.Z.); (R.A.C.); (J.B.); (Y.L.)
| | - John Beaver
- AbbVie Inc., North Chicago, IL 60064, USA; (X.Z.); (R.A.C.); (J.B.); (Y.L.)
| | - Yanping Luo
- AbbVie Inc., North Chicago, IL 60064, USA; (X.Z.); (R.A.C.); (J.B.); (Y.L.)
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Bailey SA, Subramanian K, Sanchez J, P Horton R, Natale A, Thambidorai S. Same Day versus Overnight Discharge in Patients Undergoing Ablation for Atrial Fibrillation (SODA) Study. J Atr Fibrillation 2021; 14:20200499. [PMID: 34950374 DOI: 10.4022/jafib.20200499] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2021] [Revised: 04/11/2021] [Accepted: 05/12/2021] [Indexed: 11/10/2022]
Abstract
Patients undergoing catheter ablation for atrial fibrillation (AF) are routinely admitted for observation overnight in the hospital. With the rising incidence of AF among the population, increased volumes of procedures are placing increased demands on hospital resources. The purpose of this study was to evaluate the efficacy and safety of same day discharge in patients undergoing ablation for AF when compared to patients admitted for overnight observation. We performed a retrospective analysis using a multicenter cohort among patients who were discharged home after elective pulmonary vein isolation (PVI) ablation for AF. In our analysis, we found no statistically significant difference between patients discharged on the day of their procedure when compared to patients admitted for overnight observation in terms of 90-day readmission, major adverse cardiovascular events and death. This study shows that same day discharge after AF ablation is a feasible option. Future studies are needed to elicit the appropriate protocol to use.
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Ramalingeswar J, Subramanian K. A novel energy management strategy to reduce gird dependency using electric vehicles storage in coordination with solar power. IFS 2021. [DOI: 10.3233/jifs-210930] [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: 11/15/2022]
Abstract
The effective coordination of solar photovoltaic (solar PV) with Electrical Vehicles (EV) can substantially improve the micro grid(MG) stability and economic benefits. This paper presents a novel Energy Management System (EMS) that synchronizes EV storage with Solar PV and load variability. Reducing grid dependency and energy cost of the MGs are the key objectives of the proposed EMS. A smart EV prioritization based control strategy is developed using fuzzy controller. Probabilistic approach is designed to estimate the EV usage expectancy in the near time zone that helps smart decision on choosing EVs. Minimizing battery degradation and maximizing EV storage exploitation are the key objectives of EV prioritization. On the other hand, Water Filling Algorithm (WFA) is used for Optimal Storage Distribution (OSD) in each zone of energy need for load flattening. The proposed EMS is implemented in a real time on-grid MG scenario and different case studies have been investigated to realize the impact of proposed EMS. A comprehensive cost analysis has been conducted and the efficacy of the proposed EMS is analysed.
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Affiliation(s)
- J.T. Ramalingeswar
- School of Electrical Engineering, VIT University, Vellore, Tamil Nadu, India
| | - K. Subramanian
- School of Electrical Engineering, VIT University, Vellore, Tamil Nadu, India
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Sedarous M, Alayo Q, Subramanian K, Nwaiwu O, Okafor PN. A90 A PROPENSITY SCORE-MATCHED, STATE-LEVEL COMPARISON OF INPATIENT CIRRHOSIS OUTCOMES IN ENGLISH VS NON-ENGLISH SPEAKING PATIENTS. J Can Assoc Gastroenterol 2021. [DOI: 10.1093/jcag/gwab002.088] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Abstract
Background
United States (US) citizens speaking a foreign language at home has increased by 192% from 1980 to 2018.
Aims
With the increase in multiculturalism and ongoing concerns for health disparities in the US, we sought to compare inpatient outcomes between non-English speaking and English-speaking patients with cirrhosis.
Methods
The 2013–14 Maryland State inpatient databases were used to compare inpatient outcomes in adult patients with cirrhosis. The analysis cohort was identified using a validated algorithm of ICD-9 codes. Cirrhosis patients were stratified based on primary language into non-English-speaking patients [NESP] vs English-speaking patients [ESP]. A 1:3 propensity score matching analysis based on possible confounders was used to finalize the analysis cohort. The primary outcome (all-cause in-hospital mortality) and secondary outcomes including 30-day all-cause readmission rates, length of stay, total hospitalization charges were then compared between groups.
Results
In the study period, 3,035 NESP vs 21,212 ESP discharges were identified. We matched 1,659 NESP with 4,928 ESP using a 1:3 algorithm. Table 1 highlights demographic data. In the unmatched analysis, all-cause mortality was higher in the ESP cohort compared to NESP (6.71% vs 5.73%, p=0.046). However, after propensity-matching, inpatient mortality rate became comparable between both groups (6.45% vs 6.51%, p=0.9). Thirty day all-cause readmission rates were also similar between ESP vs NESP (4.87% vs 4.28%, p=0.18). Median length of stay in the ESP group was 4 days (IQR 3–8) vs 5 days (IQR 3–7) in the NESP group, while median total charges in ESP were $55,984 (IQR $33,897-$98,679) compared to $61,262 (IQR $36,228-$$108,369) in NESP.
Conclusions
While significant differences in socioeconomic status and payer type exist between non-English and English speaking cirrhosis patients, these do not appear to negatively impact inpatient outcomes including all-cause inpatient mortality, 30-day readmission rates, length of stay, total hospital charges.
Funding Agencies
None
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Affiliation(s)
- M Sedarous
- Internal Medicine, McMaster University, Mississauga, ON, Canada
| | - Q Alayo
- Division of Gastroenterology, John T. Milliken Department of Medicine, Washington University School of Medicine in Saint Louis, St Louis, MO
| | - K Subramanian
- Division of Gastroenterology and Hepatology, Stanford University School of Medicine, Stanford, CA
| | - O Nwaiwu
- Department of Family & Preventive Medicine, University of Arkansas School of Medical Sciences, Little Rock, AR
| | - P N Okafor
- Division of Gastroenterology and Hepatology, Stanford University School of Medicine, Stanford, CA
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Subramanian K, Iovino F, Tsikourkitoudi V, Merkl P, Ahmed S, Berry SB, Aschtgen MS, Svensson M, Bergman P, Sotiriou GA, Henriques-Normark B. Mannose receptor-derived peptides neutralize pore-forming toxins and reduce inflammation and development of pneumococcal disease. EMBO Mol Med 2020; 12:e12695. [PMID: 32985105 PMCID: PMC7645366 DOI: 10.15252/emmm.202012695] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [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: 05/07/2020] [Revised: 08/30/2020] [Accepted: 09/02/2020] [Indexed: 12/30/2022] Open
Abstract
Cholesterol‐dependent cytolysins (CDCs) are essential virulence factors for many human pathogens like Streptococcus pneumoniae (pneumolysin, PLY), Streptococcus pyogenes (streptolysin O, SLO), and Listeria monocytogenes (Listeriolysin, LLO) and induce cytolysis and inflammation. Recently, we identified that pneumococcal PLY interacts with the mannose receptor (MRC‐1) on specific immune cells thereby evoking an anti‐inflammatory response at sublytic doses. Here, we identified the interaction sites between MRC‐1 and CDCs using computational docking. We designed peptides from the CTLD4 domain of MRC‐1 that binds to PLY, SLO, and LLO, respectively. In vitro, the peptides blocked CDC‐induced cytolysis and inflammatory cytokine production by human macrophages. Also, they reduced PLY‐induced damage of the epithelial barrier integrity as well as blocked bacterial invasion into the epithelium in a 3D lung tissue model. Pre‐treatment of human DCs with peptides blocked bacterial uptake via MRC‐1 and reduced intracellular bacterial survival by targeting bacteria to autophagosomes. In order to use the peptides for treatment in vivo, we developed calcium phosphate nanoparticles (CaP NPs) as peptide nanocarriers for intranasal delivery of peptides and enhanced bioactivity. Co‐administration of peptide‐loaded CaP NPs during infection improved survival and bacterial clearance in both zebrafish and mice models of pneumococcal infection. We suggest that MRC‐1 peptides can be employed as adjunctive therapeutics with antibiotics to treat bacterial infections by countering the action of CDCs.
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Affiliation(s)
- Karthik Subramanian
- Department of Microbiology, Tumor and Cell Biology, Karolinska Institutet, Stockholm, Sweden
| | - Federico Iovino
- Department of Microbiology, Tumor and Cell Biology, Karolinska Institutet, Stockholm, Sweden
| | - Vasiliki Tsikourkitoudi
- Department of Microbiology, Tumor and Cell Biology, Karolinska Institutet, Stockholm, Sweden
| | - Padryk Merkl
- Department of Microbiology, Tumor and Cell Biology, Karolinska Institutet, Stockholm, Sweden
| | - Sultan Ahmed
- Department of Laboratory Medicine, Karolinska Institutet, Huddinge, Sweden
| | - Samuel B Berry
- Department of Medicine, Center for Infectious Medicine, Karolinska Institutet, Karolinska University Hospital, Huddinge, Sweden
| | | | - Mattias Svensson
- Department of Medicine, Center for Infectious Medicine, Karolinska Institutet, Karolinska University Hospital, Huddinge, Sweden
| | - Peter Bergman
- Department of Laboratory Medicine, Karolinska Institutet, Huddinge, Sweden.,The Immunodeficiency Unit, Department of Infectious Diseases, Karolinska University Hospital, Stockholm, Sweden
| | - Georgios A Sotiriou
- Department of Microbiology, Tumor and Cell Biology, Karolinska Institutet, Stockholm, Sweden
| | - Birgitta Henriques-Normark
- Department of Microbiology, Tumor and Cell Biology, Karolinska Institutet, Stockholm, Sweden.,Clinical Microbiology, Karolinska University Hospital, Stockholm, Sweden.,Lee Kong Chian School of Medicine (LKC) and Singapore Centre on Environmental Life Sciences Engineering (SCELSE), Nanyang Technological University, Singapore, Singapore
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Sterling B, Kiang T, Subramanian K, Saltman M, Smart W, Tsay M, Sugarman J, Patel D, Monger D, Martin D. Simultaneous Patient-Side Measurement of Hemoglobin, Glucose, and Cholesterol in Finger-Stick Blood. Clin Chem 2019. [DOI: 10.1093/clinchem/38.9.1658] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
Abstract
Abstract
We describe a multianalyte assay system for patient-side use comprising single-use plastic cartridges and a small monitor. Hemoglobin, glucose, and cholesterol can be simultaneously measured in 3 min in an unmeasured volume of blood. The sample is drawn by capillary action into four channels for delivery to assay-specific stacks containing a set of closely apposed layers. The distal layer is a membrane that acts as the optical surface for reflectance optics. For glucose and cholesterol assays, erythrocytes are removed by a fibrous filter layer and oxidase-peroxidase chemical reactions contained in the optical membrane generate a colored product. For hemoglobin measurement, blood is lysed by detergent contained in a porous disk. The amount of color reaching the optical membrane is measured by fiber optics. To ensure fail-safe operation, sensors verify sample sufficiency and degree of hemolysis. The assays perform comparably with laboratory methods.
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Affiliation(s)
- B Sterling
- Biotrack, Ciba Corning Diagnostics, Mountain View, CA 94043
| | - T Kiang
- Biotrack, Ciba Corning Diagnostics, Mountain View, CA 94043
| | - K Subramanian
- Biotrack, Ciba Corning Diagnostics, Mountain View, CA 94043
| | - M Saltman
- Biotrack, Ciba Corning Diagnostics, Mountain View, CA 94043
| | - W Smart
- Biotrack, Ciba Corning Diagnostics, Mountain View, CA 94043
| | - M Tsay
- Biotrack, Ciba Corning Diagnostics, Mountain View, CA 94043
| | - J Sugarman
- Biotrack, Ciba Corning Diagnostics, Mountain View, CA 94043
| | - D Patel
- Biotrack, Ciba Corning Diagnostics, Mountain View, CA 94043
| | - D Monger
- Biotrack, Ciba Corning Diagnostics, Mountain View, CA 94043
| | - D Martin
- Biotrack, Ciba Corning Diagnostics, Mountain View, CA 94043
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Syed Abuthahir S, NizamMohideen M, Viswanathan V, Govindhan M, Subramanian K. Crystal structure and Hirshfeld surface analysis of 2-[(2-oxo-2 H-chromen-4-yl)-oxy]acetic acid dimethyl sulfoxide monosolvate. Acta Crystallogr E Crystallogr Commun 2019; 75:1123-1127. [PMID: 31417777 PMCID: PMC6690464 DOI: 10.1107/s2056989019009447] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [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: 05/21/2019] [Accepted: 07/01/2019] [Indexed: 12/02/2022]
Abstract
The title compound, C11H8O5·(CH3)2SO, is a new coumarin derivative. The asymmetric unit contains two coumarin mol-ecules (A and B) and two di-methyl-sulfoxide solvent mol-ecules (A and B). The dihedral angle between the pyran and benzene rings in the chromene moiety is 3.56 (2)° for mol-ecule A and 1.83 (2)° for mol-ecule B. In mol-ecule A, the dimethyl sulfoxide sulfur atom is disordered over two positions with a refined occupancy ratio of 0.782 (5):0.218 (5). In the crystal, mol-ecules are linked by O-H⋯O hydrogen bonds, forming chains running along the c-axis direction. The chains are linked by C-H⋯O hydrogen bonds, forming layers parallel to the ac plane. In addition, there are also C-H⋯π and π-π inter-actions present within the layers. The inter-molecular contacts in the crystal have been analysed using Hirshfeld surface analysis and two-dimensional fingerprint plots, which indicate that the most important contributions to the packing are from H⋯H (33.9%) and O⋯H/H⋯O (41.2%) contacts.
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Affiliation(s)
- S. Syed Abuthahir
- PG & Research Department of Physics, The New College (Autonomous), University of Madras, Chennai 600 014, Tamil Nadu, India
| | - M. NizamMohideen
- PG & Research Department of Physics, The New College (Autonomous), University of Madras, Chennai 600 014, Tamil Nadu, India
| | - V. Viswanathan
- Department of Biophysics, All India Institute of Medical Science, New Delhi 110 029, India
| | - M. Govindhan
- Department of Chemistry, Anna University, Chennai 600 025, India
- Orchid Chemicals & Pharmaceuticals Ltd, R&D Centre, Sholinganallur, Chennai 600 119, India
| | - K. Subramanian
- Department of Chemistry, Anna University, Chennai 600 025, India
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Subramanian K, Henriques-Normark B, Normark S. Emerging concepts in the pathogenesis of the Streptococcus pneumoniae: From nasopharyngeal colonizer to intracellular pathogen. Cell Microbiol 2019; 21:e13077. [PMID: 31251447 PMCID: PMC6899785 DOI: 10.1111/cmi.13077] [Citation(s) in RCA: 55] [Impact Index Per Article: 11.0] [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: 03/14/2019] [Revised: 06/17/2019] [Accepted: 06/21/2019] [Indexed: 12/19/2022]
Abstract
Streptococcus pneumoniae (the pneumococcus) is a human respiratory tract pathogen and a major cause of morbidity and mortality globally. Although the pneumococcus is a commensal bacterium that colonizes the nasopharynx, it also causes lethal diseases such as meningitis, sepsis, and pneumonia, especially in immunocompromised patients, in the elderly, and in young children. Due to the acquisition of antibiotic resistance and the emergence of nonvaccine serotypes, the pneumococcus has been classified as one of the priority pathogens for which new antibacterials are urgently required by the World Health Organization, 2017. Understanding molecular mechanisms behind the pathogenesis of pneumococcal infections and bacterial interactions within the host is crucial to developing novel therapeutics. Previously considered to be an extracellular pathogen, it is becoming evident that pneumococci may also occasionally establish intracellular niches within the body to escape immune surveillance and spread within the host. Intracellular survival within host cells also enables pneumococci to resist many antibiotics. Within the host cell, the bacteria exist in unique vacuoles, thereby avoiding degradation by the acidic lysosomes, and modulate the expression of its virulence genes to adapt to the intracellular environment. To invade and survive intracellularly, the pneumococcus utilizes a combination of virulence factors such as pneumolysin (PLY), pneumococcal surface protein A (PspA), pneumococcal adhesion and virulence protein B (PavB), the pilus‐1 adhesin RrgA, pyruvate oxidase (SpxB), and metalloprotease (ZmpB). In this review, we discuss recent findings showing the intracellular persistence of Streptococcus pneumoniae and its underlying mechanisms.
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Affiliation(s)
- Karthik Subramanian
- Department of Microbiology, Tumor and Cell Biology, Karolinska Institutet, Stockholm, Sweden
| | - Birgitta Henriques-Normark
- Department of Microbiology, Tumor and Cell Biology, Karolinska Institutet, Stockholm, Sweden.,Clinical Microbiology, Karolinska University Hospital, Stockholm, Sweden.,Lee Kong Chian School of Medicine (LKC) and Singapore Centre on Environmental Life Sciences Engineering (SCELSE), Nanyang Technological University, Singapore
| | - Staffan Normark
- Department of Microbiology, Tumor and Cell Biology, Karolinska Institutet, Stockholm, Sweden.,Clinical Microbiology, Karolinska University Hospital, Stockholm, Sweden.,Lee Kong Chian School of Medicine (LKC) and Singapore Centre on Environmental Life Sciences Engineering (SCELSE), Nanyang Technological University, Singapore
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15
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Syed Abuthahir S, NizamMohideen M, Viswanathan V, Govindhan M, Subramanian K. The crystal structures of two new coumarin derivatives: 2-(4-{2-[(2-oxo-2 H-chromen-4-yl)-oxy]acet-yl}piperazin-1-yl)acetamide and N-(2,4-di-meth-oxy-benz-yl)-2-[(2-oxo-2 H-chromen-4-yl)-oxy]acetamide. Acta Crystallogr E Crystallogr Commun 2019; 75:482-488. [PMID: 31161061 PMCID: PMC6509693 DOI: 10.1107/s2056989019003736] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [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: 02/18/2019] [Accepted: 03/18/2019] [Indexed: 11/22/2022]
Abstract
The title compounds, 2-(4-{2-[(2-oxo-2H-chromen-4-yl)-oxy]acet-yl}piperazin-1-yl)acetamide, C17H19N3O5, (I), and N-(2,4-di-meth-oxy-benz-yl)-2-[(2-oxo-2H-chromen-4-yl)-oxy]acetamide, C20H19NO6, (II), are new coumarin derivatives. In compound (I), the six-membered piperazine adopts a chair conformation. The dihedral angles between the mean planes of the chromene ring and amide plane is 82.65 (7)° in (I) and 26.2 (4)° in (II). The dihedral angles between the mean planes of the chromene ring and the four planar C atoms of the piperazine ring in (I) and the benzene ring in (II) are 87.66 (6) and 65.0 (4)°, respectively. There are short intra-molecular contacts in both mol-ecules forming S(5) ring motifs, viz. N-H⋯N and C-H⋯O in (I), and N-H⋯O and C-H⋯N in (II). In the crystals of both compounds, mol-ecules are linked by N-H⋯O hydrogen bonds, forming chains along [10] in (I) and [010] in (II). The chains are linked by C-H⋯O hydrogen bonds, forming layers parallel to the ab plane in the crystals of both compounds. In the crystal of (I), there are also C-H⋯π and offset π-π inter-actions [inter-centroid distance = 3.691 (1) Å] present within the layers. In the crystal of (II), there are only weak offset π-π inter-actions [inter-centroid distance = 3.981 (6) Å] present within the layers. The inter-molecular contacts in the crystals of both compounds have been analysed using Hirshfeld surface analysis and two-dimensional fingerprint plots.
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Affiliation(s)
- S. Syed Abuthahir
- PG & Research Department of Physics, The New College (Autonomous), Chennai 600 014, Tamil Nadu, India
| | - M. NizamMohideen
- PG & Research Department of Physics, The New College (Autonomous), Chennai 600 014, Tamil Nadu, India
| | - V. Viswanathan
- Department of Biophysics, All India Institute of Medical Science, New Delhi 110 029, India
| | - M. Govindhan
- Department of Chemistry, Anna University, Chennai 600 025, India
- Orchid Chemicals & Pharmaceuticals Ltd, R&D Centre, Sholinganallur, Chennai 600 119, India
| | - K. Subramanian
- Department of Chemistry, Anna University, Chennai 600 025, India
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Mills CE, Hafner M, Subramanian K, Chen C, Chung M, Boswell SA, Everley RA, Walmsley CS, Juric D, Sorger PK. Abstract PD1-12: Omics profiling of CDK4/6 inhibitors reveals functionally important secondary targets of abemaciclib. Cancer Res 2019. [DOI: 10.1158/1538-7445.sabcs18-pd1-12] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
The recent introduction of small molecule inhibitors of cyclin-dependent kinases (CDK) 4/6 to the clinic has improved the treatment of hormone receptor positive breast cancer, and shown promise in other malignancies. The three clinically used CDK4/6 inhibitors, palbociclib, ribociclib, and abemaciclib, are reported to be broadly similar although recent data suggest that abemaciclib has distinct single-agent activity in patients and a unique adverse effects profile. Key questions are: How do these drugs differ at the molecular level? Should such differences inform their use in the clinic? Can these three agents be used interchangeably or should patient stratification differ between them? We use molecular and functional profiling by mRNA sequencing, mass spectrometry-based proteomics, and GR-based dose-response assays to obtain complementary views of the mechanisms of action of CDK4/6 inhibitors. We show that abemaciclib, but not ribociclib or palbociclib, is a potent inhibitor of kinases other than CDK4/6, including CDK1/Cyclin B, which appears to cause arrest in the G2 phase of the cell cycle, and CDK2/Cyclin E/A, which is implicated in resistance to palbociclib. We show that inhibition of these additional targets is accessible in a xenograft model. Whereas ribociclib and palbociclib induce cytostasis, and cells adapt to these drugs within 2-3 days of exposure, abemaciclib induces cell death and durably blocks cell proliferation. Abemaciclib is active even in retinoblastoma protein (pRb)-deficient cells in which CDK4/6 inhibition by palbociclib or ribociclib is completely ineffective. The degree of polypharmacology of small molecule drugs is increasingly viewed as an important consideration in their design, with implications for efficacy, toxicity, and acquired resistance. In the case of CDK4/6 inhibitors, we propose that abemaciclib polypharmacology elicits unique molecular responses. More generally, we propose that multi-omic approaches are required to fully elucidate the spectrum of targets relevant to drug action in tumor cells. We expect such understanding to assist in stratifying patient populations and ordering sequential therapies when resistance arises.
Citation Format: Mills CE, Hafner M, Subramanian K, Chen C, Chung M, Boswell SA, Everley RA, Walmsley CS, Juric D, Sorger PK. Omics profiling of CDK4/6 inhibitors reveals functionally important secondary targets of abemaciclib [abstract]. In: Proceedings of the 2018 San Antonio Breast Cancer Symposium; 2018 Dec 4-8; San Antonio, TX. Philadelphia (PA): AACR; Cancer Res 2019;79(4 Suppl):Abstract nr PD1-12.
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Affiliation(s)
- CE Mills
- Harvard Medical School, Boston, MA; Massachusetts General Hospital, Boston, MA
| | - M Hafner
- Harvard Medical School, Boston, MA; Massachusetts General Hospital, Boston, MA
| | - K Subramanian
- Harvard Medical School, Boston, MA; Massachusetts General Hospital, Boston, MA
| | - C Chen
- Harvard Medical School, Boston, MA; Massachusetts General Hospital, Boston, MA
| | - M Chung
- Harvard Medical School, Boston, MA; Massachusetts General Hospital, Boston, MA
| | - SA Boswell
- Harvard Medical School, Boston, MA; Massachusetts General Hospital, Boston, MA
| | - RA Everley
- Harvard Medical School, Boston, MA; Massachusetts General Hospital, Boston, MA
| | - CS Walmsley
- Harvard Medical School, Boston, MA; Massachusetts General Hospital, Boston, MA
| | - D Juric
- Harvard Medical School, Boston, MA; Massachusetts General Hospital, Boston, MA
| | - PK Sorger
- Harvard Medical School, Boston, MA; Massachusetts General Hospital, Boston, MA
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Subramanian K, Neill DR, Malak H, Spelmink L, Khandaker S, Marchiori GDL, Dearing E, Kirby A, Yang M, Achour A, Nilvebrant J, Nygren PÅ, Plant L, Kadioglu A, Henriques-Normark B. Pneumolysin binds to the mannose receptor C type 1 (MRC-1) leading to anti-inflammatory responses and enhanced pneumococcal survival. Nat Microbiol 2019; 4:62-70. [PMID: 30420782 PMCID: PMC6298590 DOI: 10.1038/s41564-018-0280-x] [Citation(s) in RCA: 64] [Impact Index Per Article: 12.8] [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: 02/07/2018] [Accepted: 10/01/2018] [Indexed: 12/14/2022]
Abstract
Streptococcus pneumoniae (the pneumococcus) is a major cause of mortality and morbidity globally, and the leading cause of death in children under 5 years old. The pneumococcal cytolysin pneumolysin (PLY) is a major virulence determinant known to induce pore-dependent pro-inflammatory responses. These inflammatory responses are driven by PLY-host cell membrane cholesterol interactions, but binding to a host cell receptor has not been previously demonstrated. Here, we discovered a receptor for PLY, whereby pro-inflammatory cytokine responses and Toll-like receptor signalling are inhibited following PLY binding to the mannose receptor C type 1 (MRC-1) in human dendritic cells and mouse alveolar macrophages. The cytokine suppressor SOCS1 is also upregulated. Moreover, PLY-MRC-1 interactions mediate pneumococcal internalization into non-lysosomal compartments and polarize naive T cells into an interferon-γlow, interleukin-4high and FoxP3+ immunoregulatory phenotype. In mice, PLY-expressing pneumococci colocalize with MRC-1 in alveolar macrophages, induce lower pro-inflammatory cytokine responses and reduce neutrophil infiltration compared with a PLY mutant. In vivo, reduced bacterial loads occur in the airways of MRC-1-deficient mice and in mice in which MRC-1 is inhibited using blocking antibodies. In conclusion, we show that pneumococci use PLY-MRC-1 interactions to downregulate inflammation and enhance bacterial survival in the airways. These findings have important implications for future vaccine design.
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Affiliation(s)
- Karthik Subramanian
- Department of Microbiology, Tumor and Cell Biology, Karolinska Institutet, SE-171 77 Stockholm, Sweden
| | - Daniel R Neill
- Institute of Infection and Global Health, Ronald Ross Building, 8 West Derby Street, University of Liverpool, Liverpool, UK
| | - Hesham Malak
- Institute of Infection and Global Health, Ronald Ross Building, 8 West Derby Street, University of Liverpool, Liverpool, UK
| | - Laura Spelmink
- Department of Microbiology, Tumor and Cell Biology, Karolinska Institutet, SE-171 77 Stockholm, Sweden
| | - Shadia Khandaker
- Institute of Infection and Global Health, Ronald Ross Building, 8 West Derby Street, University of Liverpool, Liverpool, UK
| | | | - Emma Dearing
- Institute of Infection and Global Health, Ronald Ross Building, 8 West Derby Street, University of Liverpool, Liverpool, UK
| | - Alun Kirby
- Centre for Immunology and Infection, Department of Biology and Hull York Medical School, University of York, York, UK
| | - Marie Yang
- Institute of Infection and Global Health, Ronald Ross Building, 8 West Derby Street, University of Liverpool, Liverpool, UK
| | - Adnane Achour
- Science for Life Laboratory, Department of Medicine Solna, Karolinska Institutet, and Department of Infectious Diseases, Karolinska University Hospital, Solna, Stockholm, SE, 17176, Sweden
| | - Johan Nilvebrant
- Division of Protein Technology, School of Biotechnology, Royal Institute of Technology (KTH), SE-106 91 Stockholm, Sweden
| | - Per-Åke Nygren
- Division of Protein Technology, School of Biotechnology, Royal Institute of Technology (KTH), SE-106 91 Stockholm, Sweden
| | - Laura Plant
- Department of Microbiology, Tumor and Cell Biology, Karolinska Institutet, SE-171 77 Stockholm, Sweden
| | - Aras Kadioglu
- Institute of Infection and Global Health, University of Liverpool, Liverpool, UK.
| | - Birgitta Henriques-Normark
- Department of Microbiology, Tumor and Cell Biology, Karolinska Institutet, Stockholm, Sweden. .,Clinical Microbiology, Karolinska University Hospital Solna, Stockholm, Sweden. .,Lee Kong Chian School of Medicine (LKC) and Singapore Centre on Environmental Life Sciences Engineering (SCELSE), Nanyang Technological University, Singapore, Singapore.
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Subramanian K, Switchenko J, Flowers C, Esiashvili N, Khan M. Consolidative Radiation Therapy (RT) for Advanced Stage Hodgkin’s Lymphoma (HL) May Improve Progression Free Survival Than ABVD Alone for Adult Patients. Int J Radiat Oncol Biol Phys 2018. [DOI: 10.1016/j.ijrobp.2018.07.898] [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: 11/17/2022]
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Srinivasan K, Subramanian K, Murugan K, Dinakaran K. Sensitive fluorescence detection of mercury(ii) in aqueous solution by the fluorescence quenching effect of MoS 2 with DNA functionalized carbon dots. Analyst 2018; 141:6344-6352. [PMID: 27704070 DOI: 10.1039/c6an00879h] [Citation(s) in RCA: 54] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
A rapid and sensitive fluorescent sensor based on the MoS2 nanosheet/DNA/carbon dot nanoassembly has been developed towards the detection of mercury(ii) present in environmental samples. Bio-carbon dots (CDs) having strong fluorescence maxima at 451 nm were synthesized via one-step treatment with honey under low temperature carbonization. These CDs were nearly spherical with good size distribution and excellent monodispersity, and the average sizes of CD were around 2-4 nm as evidenced from transmission electron microscopy. The conjugation of DNA strands on the surface of the carbon dots provided an efficient fluorescent probe. The fluorescence of the MoS2 nanosheet/DNA/carbon dot nanoassembly enhanced gradually with the increase in the concentration of Hg2+ ions and the detection limit was found to be 1.02 nM. Furthermore, the fluorescence intensity was found to be linear with the concentration of Hg2+ ions in the range from 0 to 10 nM and their respective coefficient of determination was found to be 0.93676 and 0.98178. The present MoS2 nanosheet/DNA/carbon dot nanoassembly is highly selective toward Hg2+ ions over a wide range of metal ions tested.
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Affiliation(s)
- K Srinivasan
- Department of Chemistry, Anna University, Guindy, Chennai - 600 025, India
| | - K Subramanian
- Department of Chemistry, Anna University, Guindy, Chennai - 600 025, India
| | - K Murugan
- Department of Zoology, Bharathiar University, Coimbatore - 641 046, India
| | - K Dinakaran
- Department of Chemistry, Thiruvalluvar University, Vellore - 632 115, India.
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Khan A, Wani M, Subramanian K, Kandhavelu J, Ruff P, Penny C. PO-033 Anticancer activity of natural high mobility group BOX1 inhibitors in colorectal cancer cells. ESMO Open 2018. [DOI: 10.1136/esmoopen-2018-eacr25.78] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
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Mills CE, Subramanian K, Hafner M, Chung M, Boswell SA, Everley RA, Juric D, Sorger PK. Abstract P2-07-03: Systematic characterization of kinase inhibitors reveals heterogeneity in responses by class and cell line. Cancer Res 2018. [DOI: 10.1158/1538-7445.sabcs17-p2-07-03] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
Several publications have addressed concerns surrounding drug response screens by pointing out sources of variability and by presenting recommendations for better experimental methods and more robust analytical approaches. In the presented profiling effort, we integrated the latest advances in drug response measurement and focused on data diversity and quality rather than on breadth. We selected 32 breast cancer cell lines with a strong bias towards triple negative lines as well as 4 cell lines established from relevant patient-derived xenografts. We evaluated a panel of clinically relevant kinase inhibitors using a microscopy-based dose response assay to measure drug potency, and to quantify drug efficacy in terms of growth inhibition (GR metrics) and cell death. The use of the GR metrics to quantify drug sensitivity enabled us to identify and study differences between cytostatic and cytotoxic responses. This systematic dose response dataset is complemented by measurements of baseline transcript expression levels by mRNAseq, quantification of absolute abundance of ˜12,000 proteins, and relative phosphoprotein levels by shotgun mass spectrometry across all cell lines. Additionally, the baseline activity of transcription factors and kinases were inferred from the mRNA (using VIPER) and phosphoprotein (using kinase enrichment analysis) data, respectively. The complementarity of these multi-omics data has allowed us to address questions about the landscape of breast cancer cell lines such as: Where do the patient-derived lines lay relative to the conventional cell lines? How consistent are the landscapes defined by each dataset? How does integration across datasets provide mechanistic insight into signaling pathways that are active in each cancer subtypes? The measured and inferred baseline data were used to build predictors of the observed drug responses with the goal of identifying the biological processes responsible for the differences in sensitivity across drugs and cell lines. Overall the dataset that has been collected is a valuable resource for understanding drug response in triple negative breast cancer, and the molecular mechanisms that influence it.
Citation Format: Mills CE, Subramanian K, Hafner M, Chung M, Boswell SA, Everley RA, Juric D, Sorger PK. Systematic characterization of kinase inhibitors reveals heterogeneity in responses by class and cell line [abstract]. In: Proceedings of the 2017 San Antonio Breast Cancer Symposium; 2017 Dec 5-9; San Antonio, TX. Philadelphia (PA): AACR; Cancer Res 2018;78(4 Suppl):Abstract nr P2-07-03.
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Affiliation(s)
- CE Mills
- Harvard Medical School, Boston, MA; Massachusetts General Hospital, Boston, MA
| | - K Subramanian
- Harvard Medical School, Boston, MA; Massachusetts General Hospital, Boston, MA
| | - M Hafner
- Harvard Medical School, Boston, MA; Massachusetts General Hospital, Boston, MA
| | - M Chung
- Harvard Medical School, Boston, MA; Massachusetts General Hospital, Boston, MA
| | - SA Boswell
- Harvard Medical School, Boston, MA; Massachusetts General Hospital, Boston, MA
| | - RA Everley
- Harvard Medical School, Boston, MA; Massachusetts General Hospital, Boston, MA
| | - D Juric
- Harvard Medical School, Boston, MA; Massachusetts General Hospital, Boston, MA
| | - PK Sorger
- Harvard Medical School, Boston, MA; Massachusetts General Hospital, Boston, MA
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Solomon N, Zeyhle E, Subramanian K, Fields PJ, Romig T, Kern P, Carter JY, Wachira J, Mengiste A, Macpherson CNL. Cystic echinococcosis in Turkana, Kenya: 30 years of imaging in an endemic region. Acta Trop 2018; 178:182-189. [PMID: 29155205 DOI: 10.1016/j.actatropica.2017.11.006] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2017] [Revised: 11/06/2017] [Accepted: 11/15/2017] [Indexed: 12/28/2022]
Abstract
Cystic echinococcosis (CE), a widespread, complex zoonosis, causes chronic disease associated with high morbidity. The pastoral Turkana people of Kenya have one of the highest prevalence rates of CE in the world. Between 1983 and 2015, a CE control program in the Turkana region used ultrasound (US) screening surveys and surgical outreach visits to evaluate CE prevalence and treat those with the disease. As the gold standard modality for diagnosing CE, US reveals a great deal of information about the disease in affected populations. The aim of this study is to discuss the characteristics of untreated CE in the Turkana people as revealed by US data collected during the CE control program and evaluate disease presentation, factors influencing the risk of transmission, and the timeline of disease progression. Data were obtained from written patient notes from US screenings and images; cysts were classified using the World Health Organization (WHO) standardized US classification of CE. Findings include greater prevalence of cysts, later stages of cysts, and multiple cysts in older age groups, with no multiple cysts occurring in patients under six years of age, which are consistent with the assertion that rates of exposure, transmission, and infection increase with age in endemic regions. Findings also raise questions regarding the timeline of disease progression, and factors potentially influencing disease transmission within this and other endemic populations. A comprehensive survey focusing on cultural and community observations (e.g., changing behaviors, hygienic practices, etc.) may provide more detailed information regarding factors that facilitate transmission.
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Affiliation(s)
- N Solomon
- Windward Islands Research and Education Foundation (WINDREF), P.O. Box 7, St. George's, Grenada; St. George's University School of Medicine, P.O. Box 7, St. George's, Grenada.
| | - E Zeyhle
- Meru University of Science and Technology, Mararo Road, Carlton Court, C1, Nairobi, Kenya.
| | - K Subramanian
- St. George's University School of Medicine, P.O. Box 7, St. George's, Grenada.
| | - P J Fields
- Windward Islands Research and Education Foundation (WINDREF), P.O. Box 7, St. George's, Grenada; St. George's University School of Medicine, P.O. Box 7, St. George's, Grenada; St. George's University School of Veterinary Medicine, P.O. Box 7, St. George's, Grenada.
| | - T Romig
- University of Hohenheim, FG Parasitologie 220B, Emil-Wolff-Str. 31, 70599, Stuttgart, Germany.
| | - P Kern
- University of Ulm, Division of Infectious Diseases and Clinical Immunology, Department of Medicine III, Albert-Einstein-Allee 23, 89081 Ulm, Germany.
| | - J Y Carter
- Outreach Program, Amref Health Africa, PO Box 30125, 00100 GPO, Nairobi, Kenya.
| | - J Wachira
- Outreach Program, Amref Health Africa, PO Box 30125, 00100 GPO, Nairobi, Kenya.
| | - A Mengiste
- Outreach Program, Amref Health Africa, PO Box 30125, 00100 GPO, Nairobi, Kenya.
| | - C N L Macpherson
- Windward Islands Research and Education Foundation (WINDREF), P.O. Box 7, St. George's, Grenada; St. George's University School of Medicine, P.O. Box 7, St. George's, Grenada; St. George's University School of Veterinary Medicine, P.O. Box 7, St. George's, Grenada.
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Hariharan A, Kesava M, Alagar M, Dinakaran K, Subramanian K. Optical, electrochemical, and thermal behavior of polybenzoxazine copolymers incorporated with tetraphenylimidazole and diphenylquinoline. POLYM ADVAN TECHNOL 2017. [DOI: 10.1002/pat.4122] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- A. Hariharan
- Department of Chemistry; Anna University; Chennai 600025 India
- Centre of Excellence for Advanced Material Manufacturing, Processing and Characterization (CoExAMMPC); VFSTR University; Vadlamudi Guntur 522 213 India
| | - M. Kesava
- Department of Chemistry; Thiruvalluvar University; Vellore 632115 India
| | - M. Alagar
- Centre of Excellence for Advanced Material Manufacturing, Processing and Characterization (CoExAMMPC); VFSTR University; Vadlamudi Guntur 522 213 India
| | - K. Dinakaran
- Department of Chemistry; Thiruvalluvar University; Vellore 632115 India
| | - K. Subramanian
- Department of Chemistry; Anna University; Chennai 600025 India
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Subramanian K, Muthukumar P. Global asymptotic stability of complex-valued neural networks with additive time-varying delays. Cogn Neurodyn 2017; 11:293-306. [PMID: 28559957 DOI: 10.1007/s11571-017-9429-1] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [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: 12/28/2016] [Revised: 02/15/2017] [Accepted: 03/06/2017] [Indexed: 05/29/2023] Open
Abstract
In this paper, we extensively study the global asymptotic stability problem of complex-valued neural networks with leakage delay and additive time-varying delays. By constructing a suitable Lyapunov-Krasovskii functional and applying newly developed complex valued integral inequalities, sufficient conditions for the global asymptotic stability of proposed neural networks are established in the form of complex-valued linear matrix inequalities. This linear matrix inequalities are efficiently solved by using standard available numerical packages. Finally, three numerical examples are given to demonstrate the effectiveness of the theoretical results.
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Affiliation(s)
- K Subramanian
- Department of Mathematics, The Gandhigram Rural Institute - Deemed University, Gandhigram, Tamilnadu 624 302 India
| | - P Muthukumar
- Department of Mathematics, The Gandhigram Rural Institute - Deemed University, Gandhigram, Tamilnadu 624 302 India
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Subramanian S, Chilukuri S, Subramani V, Kathirvel M, Arun G, Swamy S, Subramanian K, Fogliata A, Cozzi L. PO-0831: Multi isocentric 4-pi volumetric modulated arc therapy approach for head and neck cancer. Radiother Oncol 2017. [DOI: 10.1016/s0167-8140(17)31268-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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John Santhosh Kumar S, Mageswari S, Nithya M, Subramanian K. Cinchonidinyl-Based Acrylic and Methacrylic Homopolymers: Synthesis, Characterization, and Antibacterial Activity. Adv Polym Technol 2017. [DOI: 10.1002/adv.21572] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
| | - S. Mageswari
- Department of Chemistry; Anna University; Chennai 600 025 India
| | - M. Nithya
- Department of Chemistry; Anna University; Chennai 600 025 India
| | - K. Subramanian
- Department of Chemistry; Anna University; Chennai 600 025 India
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Subramanian K, Bergman P, Henriques-Normark B. Vitamin D Promotes Pneumococcal Killing and Modulates Inflammatory Responses in Primary Human Neutrophils. J Innate Immun 2017; 9:375-386. [PMID: 28241127 DOI: 10.1159/000455969] [Citation(s) in RCA: 56] [Impact Index Per Article: 8.0] [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: 10/12/2016] [Accepted: 01/10/2017] [Indexed: 11/19/2022] Open
Abstract
Streptococcus pneumoniae is a major human pathogen and a leading cause of pneumonia, septicemia, and meningitis worldwide. Despite clinical studies linking vitamin D deficiency and pneumonia, molecular mechanisms behind these observations remain unclear. In particular, the effects of vitamin D on neutrophil responses remain unknown. Using pneumococcal strains, primary neutrophils isolated from human blood, and sera from patients with frequent respiratory tract infections (RTIs), we investigated the effects of vitamin D on neutrophil bactericidal and inflammatory responses, including pattern recognition receptors, antimicrobial peptides, and cytokine regulation. We found that vitamin D upregulated pattern recognition receptors, TLR2, and NOD2, and induced the antimicrobial human neutrophil peptides (HNP1-3) and LL-37, resulting in increased killing of pneumococci in a vitamin D receptor-dependent manner. Antibodies targeting HNP1-3 inhibited bacterial killing. Vitamin D supplementation of serum from patients with bacterial RTIs enhanced neutrophil killing. Moreover, vitamin D lowered inflammatory cytokine production by infected neutrophils via IL-4 production and the induction of suppressor of cytokine signaling (SOCS) proteins SOCS-1 and SOCS-3, leading to the suppression of NF-κB signaling. Thus, vitamin D enhances neutrophil killing of S. pneumoniae while dampening excessive inflammatory responses and apoptosis, suggesting that vitamin D could be used alongside antibiotics when treating pneumococcal infections.
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Affiliation(s)
- Karthik Subramanian
- Department of Microbiology, Tumor and Cell Biology, Karolinska Institutet, Stockholm, Sweden
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Subramanian K. Perilunate Dislocation – Case Report and Review of Literature. J Clin Diagn Res 2017; 11:RD06-RD08. [PMID: 28969226 DOI: 10.7860/jcdr/2017/29750.10509] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2017] [Accepted: 07/13/2017] [Indexed: 11/24/2022]
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Subramanian K, Muthukumar P. Existence, uniqueness, and global asymptotic stability analysis for delayed complex-valued Cohen–Grossberg BAM neural networks. Neural Comput Appl 2016. [DOI: 10.1007/s00521-016-2539-6] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Muthukumar P, Subramanian K. Stability criteria for Markovian jump neural networks with mode-dependent additive time-varying delays via quadratic convex combination. Neurocomputing 2016. [DOI: 10.1016/j.neucom.2016.03.058] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Xie S, Spelmink L, Codemo M, Subramanian K, Pütsep K, Henriques-Normark B, Olliver M. Cinobufagin Modulates Human Innate Immune Responses and Triggers Antibacterial Activity. PLoS One 2016; 11:e0160734. [PMID: 27529866 PMCID: PMC4986986 DOI: 10.1371/journal.pone.0160734] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2016] [Accepted: 07/25/2016] [Indexed: 02/06/2023] Open
Abstract
The traditional Chinese medicine Chan-Su is widely used for treatment of cancer and cardiovascular diseases, but also as a remedy for infections such as furunculosis, tonsillitis and acute pharyngitis. The clinical use of Chan-Su suggests that it has anti-infective effects, however, the mechanism of action is incompletely understood. In particular, the effect on the human immune system is poorly defined. Here, we describe previously unrecognized immunomodulatory activities of cinobufagin (CBG), a major bioactive component of Chan-Su. Using human monocyte-derived dendritic cells (DCs), we show that LPS-induced maturation and production of a number of cytokines was potently inhibited by CBG, which also had a pro-apoptotic effect, associated with activation of caspase-3. Interestingly, CBG triggered caspase-1 activation and significantly enhanced IL-1β production in LPS-stimulated cells. Finally, we demonstrate that CBG upregulates gene expression of the antimicrobial peptides (AMPs) hBD-2 and hBD-3 in DCs, and induces secretion of HNP1-3 and hCAP-18/LL-37 from neutrophils, potentiating neutrophil antibacterial activity. Taken together, our data indicate that CBG modulates the inflammatory phenotype of DCs in response to LPS, and triggers an antibacterial innate immune response, thus proposing possible mechanisms for the clinical effects of Chan-Su in anti-infective therapy.
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Affiliation(s)
- Shanshan Xie
- Department of Microbiology, Tumor and Cell Biology, Karolinska Institutet, SE-171 77 Stockholm, Sweden
- Department of Clinical Veterinary Medicine, College of Veterinary Medicine, Jilin University, Changchun, Jilin, China
| | - Laura Spelmink
- Department of Microbiology, Tumor and Cell Biology, Karolinska Institutet, SE-171 77 Stockholm, Sweden
| | - Mario Codemo
- Department of Microbiology, Tumor and Cell Biology, Karolinska Institutet, SE-171 77 Stockholm, Sweden
| | - Karthik Subramanian
- Department of Microbiology, Tumor and Cell Biology, Karolinska Institutet, SE-171 77 Stockholm, Sweden
| | - Katrin Pütsep
- Department of Microbiology, Tumor and Cell Biology, Karolinska Institutet, SE-171 77 Stockholm, Sweden
| | - Birgitta Henriques-Normark
- Department of Microbiology, Tumor and Cell Biology, Karolinska Institutet, SE-171 77 Stockholm, Sweden
- Department of Clinical Microbiology, Karolinska University Hospital, SE-171 76 Stockholm, Sweden
| | - Marie Olliver
- Department of Microbiology, Tumor and Cell Biology, Karolinska Institutet, SE-171 77 Stockholm, Sweden
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Abstract
INTRODUCTION Epithelioid hemangioendothelioma (EHE) of the bone is extremely rare and occurs predominantly in males. It most frequently occurs during the second and third decades of life. The lower extremities are most commonly involved. We describe a diagnostically challenging case of epithelioid hemangioendothelioma of proximal phalanx of 2nd toe of left foot with histological features reminiscent of osteoblastomatosis. CASE REPORT A 52 year old man presented with history of intermittent pain with swelling in second toe since 6 months. Radiograph showed a lytic lesion in proximal phalanx of the great toe. CT and MRI reported non specific lesion in the toe. Pain was quite severe and as the patient was a labourer and wanted to get back to his work as soon as possible a decision of disarticulation of the second toe at metatarsophalnageal joint was taken. Histopathology confirmed the diagnosis of Epithelioid hemangioendothelioma and patient was called for regular follow up. There are no complications and recurrence at two year follow up. CONCLUSION EHE of the bone is extremely rare vascular tumor. To our knowledge, this is the first case of EHE with such features. EHE should be kept as one of the important differential diagnosis while diagnosing vascular tumors. Careful attention to the histopathological features is necessary for the confirmation of the diagnosis.
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Affiliation(s)
- G Bharath Raju
- Assistant professor, Department of Orthopaedics, Kempegowda Institute of Medical Sciences. India
| | - S Shivanand
- Assistant professor, Department of Orthopaedics, Kempegowda Institute of Medical Sciences. India
| | - Karthik Subramanian
- Assistant professor, Department of Orthopaedics, Kempegowda Institute of Medical Sciences. India
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Dudal S, Subramanian K, Flandre T, Law WS, Lowe PJ, Skerjanec A, Genin JC, Duval M, Piequet A, Cordier A, Jarai G, Van Heeke G, Taplin S, Krantz C, Jones S, Warren AP, Brennan FR, Sims J, Lloyd P. Integrated pharmacokinetic, pharmacodynamic and immunogenicity profiling of an anti-CCL21 monoclonal antibody in cynomolgus monkeys. MAbs 2016; 7:829-37. [PMID: 26230385 DOI: 10.1080/19420862.2015.1060384] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
Abstract
QBP359 is an IgG1 human monoclonal antibody that binds with high affinity to human CCL21, a chemokine hypothesized to play a role in inflammatory disease conditions through activation of resident CCR7-expressing fibroblasts/myofibroblasts. The pharmacokinetics (PK) and pharmacodynamics (PD) of QBP359 in non-human primates were characterized through an integrated approach, combining PK, PD, immunogenicity, immunohistochemistry (IHC) and tissue profiling data from single- and multiple-dose experiments in cynomolgus monkeys. When compared with regular immunoglobulin typical kinetics, faster drug clearance was observed in serum following intravenous administration of 10 mg/kg and 50 mg/kg of QBP359. We have shown by means of PK/PD modeling that clearance of mAb-ligand complex is the most likely explanation for the rapid clearance of QBP359 in cynomolgus monkey. IHC and liquid chromatography mass spectrometry data suggested a high turnover and synthesis rate of CCL21 in tissues. Although lymphoid tissue was expected to accumulate drug due to the high levels of CCL21 present, bioavailability following subcutaneous administration in monkeys was 52%. In human disease states, where CCL21 expression is believed to be expressed at 10-fold higher concentrations compared with cynomolgus monkeys, the PK/PD model of QBP359 and its binding to CCL21 suggested that very large doses requiring frequent administration of mAb would be required to maintain suppression of CCL21 in the clinical setting. This highlights the difficulty in targeting soluble proteins with high synthesis rates.
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Affiliation(s)
- S Dudal
- a F. Hoffmann-La Roche Ltd. ; Basel , Switzerland
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Selvam R, Subramanian K. Synthesis of Polyacrylate-Based Chalcone Containing Different Donor Moieties and Studies on their Optical, Electrochemical, and Thermal Properties. Adv Polym Technol 2016. [DOI: 10.1002/adv.21714] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- R. Selvam
- Department of Chemistry; Anna University; Chennai 600 025 India
| | - K. Subramanian
- Department of Chemistry; Anna University; Chennai 600 025 India
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Suresh Kumar SM, Subramanian K. Enhancement in Mechanical, Thermal, and Dielectric Properties of Functionalized Graphene Oxide Reinforced Epoxy Composites. Adv Polym Technol 2016. [DOI: 10.1002/adv.21702] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
- S. M. Suresh Kumar
- Department of Chemistry; Anna University; Chennai Tamil Nadu 600025 India
| | - K. Subramanian
- Department of Chemistry; Anna University; Chennai Tamil Nadu 600025 India
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Ghosh M, Sheela ML, Choudhury S, Bahadur U, Patil S, Satheesh CT, Murugan K, Nayak R, Sridhar PS, Rao N, Mahesh B, Shashidhara HP, Krishnamoorthy N, Gupta V, Sankaran S, Subramanian K, Ajaikumar BS. Abstract P6-07-01: Multigene profiling to identify clinically relevant actionable mutations in breast cancer: An Indian study. Cancer Res 2016. [DOI: 10.1158/1538-7445.sabcs15-p6-07-01] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
Background: Numerous chemotherapeutic agents are available against breast cancer (BC), but a vast majority of patients diagnosed with this disease still develop treatment resistance and eventually succumb to disease. It remains an unmet need to identify specific molecular defects against which targeted therapy are available for improving clinical outcomes in BC. Our study aims to identify frequent hotspot mutations in BCs and determine their clinical impact.
Methods: 200 women with BC(early diagnosed and/or metastatic) aged 26-75 yrs (median age 50.5yrs) diagnosed at HCG from April 2013-15 were consented to be profiled by targeted deep sequencing for hotspot mutations in 48 cancer-related genes using Illumina's TSCAP panel and MiSeq technology in an IRB-approved prospective study in a CLIA compliant laboratory. All the cases had pathology review for stage, histological type, hormonal status and Ki67. The average coverage across 220 hot spots was greater than 1000X. Data was processed using Strand Avadis NGS™. Mutations identified in the tumor were assessed for 'actionability' i.e. response to therapy and impact on prognosis. Results: Somatic variants were detected in 75% of cases with direct impact on therapy or prognosis. Genetic aberrations were identified in PI3K/AKT/ mTOR signalling pathway in substantial fraction (27%) of breast cancer cases, out of which 17% had PIK3CA activating mutations,13 and 5 cases had PTEN and AKT deletions or truncating mutations respectively. Aberration in this pathway was more prevalent in HR+ve (53%) and HER2-ve including TNBC (61%) than in HR+/HER2+ve tumors (10.6%) of IDC histology. However, no correlation was found with stage and Ki67 index of the tumor. Notably 80% of BC cases presented with liver metastasis at the time of diagnosis were detected with PIK3CA mutation indicating its role as a surrogate marker of organ specific metastasis. PIK3CA was found to be co mutated with p53 in 16 cases (9%) of which 4 cases showed npCR post NACT. Also disruptive and non-disruptive mutations in TP53 alone were found in 25% of BC, varying widely among different histologies. A follow up of few cases showed shorter PFS and poor outcome in resected BC treated with NACT indicating its robust prognostic value in NACT setting. Furthermore, two patients were detected with cKIT mutations indicating sensitivity to imatinib and therefore enrolled on a clinical trial. The other variants were found in RB1(n=8),Her2 (n=2),FGFR amplification(n=1), KRAS(n=2),NRAS(n=3)CDH1(n=1),FBXW7(n=2) and EGFR(n=1).All these variants detected indicated resistance to conventional therapy and suggested sensitivity to available targeted therapy, either approved or in clinical trials. The response and outcome are being monitored in about 20 (10%) patients who have been enrolled in clinical trials and receiving mutation specific targeted therapy. Conclusions: This study confirms the utility of multigene profiling in early diagnosed and advanced BC patients, to stratify them on their molecular profile who could potentially benefit from targeted therapy. Prospective studies and randomized clinical trials are ongoing to confirm the independent prognostic and therapeutic value of the mutations in a larger cohort of Indian population.
Citation Format: Ghosh M, Sheela ML, Choudhury S, Bahadur U, Patil S, Satheesh CT, Murugan K, Nayak R, Sridhar PS, Rao N, Mahesh B, Shashidhara HP, Krishnamoorthy N, Gupta V, Sankaran S, Subramanian K, Ajaikumar BS. Multigene profiling to identify clinically relevant actionable mutations in breast cancer: An Indian study. [abstract]. In: Proceedings of the Thirty-Eighth Annual CTRC-AACR San Antonio Breast Cancer Symposium: 2015 Dec 8-12; San Antonio, TX. Philadelphia (PA): AACR; Cancer Res 2016;76(4 Suppl):Abstract nr P6-07-01.
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Affiliation(s)
- M Ghosh
- Triesta Sciences , Health Care Global Enterprises Ltd., Bangalore, Karnataka, India; Health Care Global Enterprises Ltd., Bangalore, Karnataka, India; Strand Center for Genomics and Personalized Medicine, Bangalore, Karnataka, India
| | - ML Sheela
- Triesta Sciences , Health Care Global Enterprises Ltd., Bangalore, Karnataka, India; Health Care Global Enterprises Ltd., Bangalore, Karnataka, India; Strand Center for Genomics and Personalized Medicine, Bangalore, Karnataka, India
| | - S Choudhury
- Triesta Sciences , Health Care Global Enterprises Ltd., Bangalore, Karnataka, India; Health Care Global Enterprises Ltd., Bangalore, Karnataka, India; Strand Center for Genomics and Personalized Medicine, Bangalore, Karnataka, India
| | - U Bahadur
- Triesta Sciences , Health Care Global Enterprises Ltd., Bangalore, Karnataka, India; Health Care Global Enterprises Ltd., Bangalore, Karnataka, India; Strand Center for Genomics and Personalized Medicine, Bangalore, Karnataka, India
| | - S Patil
- Triesta Sciences , Health Care Global Enterprises Ltd., Bangalore, Karnataka, India; Health Care Global Enterprises Ltd., Bangalore, Karnataka, India; Strand Center for Genomics and Personalized Medicine, Bangalore, Karnataka, India
| | - CT Satheesh
- Triesta Sciences , Health Care Global Enterprises Ltd., Bangalore, Karnataka, India; Health Care Global Enterprises Ltd., Bangalore, Karnataka, India; Strand Center for Genomics and Personalized Medicine, Bangalore, Karnataka, India
| | - K Murugan
- Triesta Sciences , Health Care Global Enterprises Ltd., Bangalore, Karnataka, India; Health Care Global Enterprises Ltd., Bangalore, Karnataka, India; Strand Center for Genomics and Personalized Medicine, Bangalore, Karnataka, India
| | - R Nayak
- Triesta Sciences , Health Care Global Enterprises Ltd., Bangalore, Karnataka, India; Health Care Global Enterprises Ltd., Bangalore, Karnataka, India; Strand Center for Genomics and Personalized Medicine, Bangalore, Karnataka, India
| | - PS Sridhar
- Triesta Sciences , Health Care Global Enterprises Ltd., Bangalore, Karnataka, India; Health Care Global Enterprises Ltd., Bangalore, Karnataka, India; Strand Center for Genomics and Personalized Medicine, Bangalore, Karnataka, India
| | - N Rao
- Triesta Sciences , Health Care Global Enterprises Ltd., Bangalore, Karnataka, India; Health Care Global Enterprises Ltd., Bangalore, Karnataka, India; Strand Center for Genomics and Personalized Medicine, Bangalore, Karnataka, India
| | - B Mahesh
- Triesta Sciences , Health Care Global Enterprises Ltd., Bangalore, Karnataka, India; Health Care Global Enterprises Ltd., Bangalore, Karnataka, India; Strand Center for Genomics and Personalized Medicine, Bangalore, Karnataka, India
| | - HP Shashidhara
- Triesta Sciences , Health Care Global Enterprises Ltd., Bangalore, Karnataka, India; Health Care Global Enterprises Ltd., Bangalore, Karnataka, India; Strand Center for Genomics and Personalized Medicine, Bangalore, Karnataka, India
| | - N Krishnamoorthy
- Triesta Sciences , Health Care Global Enterprises Ltd., Bangalore, Karnataka, India; Health Care Global Enterprises Ltd., Bangalore, Karnataka, India; Strand Center for Genomics and Personalized Medicine, Bangalore, Karnataka, India
| | - V Gupta
- Triesta Sciences , Health Care Global Enterprises Ltd., Bangalore, Karnataka, India; Health Care Global Enterprises Ltd., Bangalore, Karnataka, India; Strand Center for Genomics and Personalized Medicine, Bangalore, Karnataka, India
| | - S Sankaran
- Triesta Sciences , Health Care Global Enterprises Ltd., Bangalore, Karnataka, India; Health Care Global Enterprises Ltd., Bangalore, Karnataka, India; Strand Center for Genomics and Personalized Medicine, Bangalore, Karnataka, India
| | - K Subramanian
- Triesta Sciences , Health Care Global Enterprises Ltd., Bangalore, Karnataka, India; Health Care Global Enterprises Ltd., Bangalore, Karnataka, India; Strand Center for Genomics and Personalized Medicine, Bangalore, Karnataka, India
| | - BS Ajaikumar
- Triesta Sciences , Health Care Global Enterprises Ltd., Bangalore, Karnataka, India; Health Care Global Enterprises Ltd., Bangalore, Karnataka, India; Strand Center for Genomics and Personalized Medicine, Bangalore, Karnataka, India
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Ghosh M, ML S, Upasana M, Chodhury S, Mannan AU, Southekal S, Manjima C, Patil S, Murugan K, Mahesh B, Nayak R, Sridhar PSS, Rao N, Krishnamoorthy N, Gupta V, Satheesh CT, Subramanian K, Ajaikumar BS. Abstract P6-06-06: Comprehensive analysis of BRCA (BRCAm) and other germline mutations (GRm) with a clinicopathological association in breast cancer: An Indian study. Cancer Res 2016. [DOI: 10.1158/1538-7445.sabcs15-p6-06-06] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
Background: BRCAm and other GRm testing using next generation sequencing (NGS) in early diagnosed and/or metastatic breast cancer (BC) helps in the identification of both unambiguously defined deleterious mutations and sequence variants of unknown clinical significance (VUS). The early detection of these mutations in the proband and the family members help in risk stratification and instituting effective monitoring, surveillance and disease management strategies.
Methods: Out of total 200 patients diagnosed with BC (April 2013-15) 77 unrelated individuals were consented to be profiled by NGS on MiSeq platform using TruSight Cancer panel (consisting of 94 genes including 13 genes highly associated with risk of inherited breast and/or ovarian cancer) in an IRB-approved prospective study in a CLIA compliant laboratory. Paired end sequencing was done with an average coverage of > 450X. Data was processed using STRAND software and interpreted using "Strand Omics" platform. The paired tumor samples were analysed for pathological stage, histological type and hormonal status.
Results: GRm were detected in 61 cases (79%). Among all mutations detected, BRCA1/2 were found in 51% (31% in BRCA1, 20% in BRCA2) of cases. BRCA1 was found to be co-mutated with BRCA2 in 2 cases. Out of 37 deleterious mutations in BRCA1/2 genes only 10 were reported to be pathogenic (6 in BRCA1 and 4 in BRCA2) and rest were VUS. Mutation frequencies were higher among high grade IDC with HER2-ve tumors including TNBC (53%, p<0.05) with an early onset of the disease. TNBC with BRCAm were found to have no/incomplete pCR on conventional TAC regimen , subsequently started with platinum therapy and the outcome being monitored. Interestingly, 4 BRCA1 mutations including 3 non-sense and 1 frameshift mutation were found in two unrelated individuals suggesting them to be founder mutations in Indian population. The other GRm frequency (alone/ co-mutated with BRCA) was also found to be significantly high (49%) and include BRIP1, CHEK2, ERCC2, CDH1, SDHB, APC, MSH6, TP53, PALB2 and RAD51C. Stratification based on age of diagnosis(dx) showed a detection rate significantly higher in the age group of 25-50 yrs (74%) as compared to the 50-75 yrs (26%). Also a strong association of GRm status with the family history(Hx) of BC in 1st or 2nd degree relatives was indicated.
Table 1: Correlation of GRm with Dx and HxGenen%Age at dx(yrs)Family Hx (Yes=Y, No=N,Unknown=UK)BRCA1193125-50 (n=23) 50-75(n=8)Y(n=13) N(n=3) UK(n=3)BRCA2122025-50(n=21) 50-75(n=9)Y(n=8) N(n=2) UK(n=2)PALB211.7>50YCHEK258.825-50 (n=4) 50-75(n=1)YATM610.525-50 (n=4) 50-75(n=2)Y(n=5) N(n=1)RAD5111.7<50Y
Conclusions: Our study in a small cohort clearly highlighted the significance of germline testing and classifying the variant in larger cohort of BC patients with a strong family Hx of cancer particularly in BRCA1/2 positive families , and in women <50yrs for early detection and risk assessment. The study also indicates BRCAm to be an important contributor to the etiology of high grade HER2-/ TNBC in Indian patients. Expanded testing of this subtype is warranted to impact management of the disease with PARP inhibitors and/or platinum therapy.
Citation Format: Ghosh M, ML S, Upasana M, Chodhury S, Mannan AU, Southekal S, Manjima C, Patil S, Murugan K, Mahesh B, Nayak R, Sridhar PSS, Rao N, Krishnamoorthy N, Gupta V, Satheesh CT, Subramanian K, Ajaikumar BS. Comprehensive analysis of BRCA (BRCAm) and other germline mutations (GRm) with a clinicopathological association in breast cancer: An Indian study. [abstract]. In: Proceedings of the Thirty-Eighth Annual CTRC-AACR San Antonio Breast Cancer Symposium: 2015 Dec 8-12; San Antonio, TX. Philadelphia (PA): AACR; Cancer Res 2016;76(4 Suppl):Abstract nr P6-06-06.
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Affiliation(s)
- M Ghosh
- Triesta Sciences , Health Care Global Enterprises Ltd., Bangalore, Karnataka, India; Health Care Global Enterprises Ltd., Bangalore, Karnataka, India; Strand Center for Genomics and Personalized Medicine, Bangalore, Karnataka, India
| | - S ML
- Triesta Sciences , Health Care Global Enterprises Ltd., Bangalore, Karnataka, India; Health Care Global Enterprises Ltd., Bangalore, Karnataka, India; Strand Center for Genomics and Personalized Medicine, Bangalore, Karnataka, India
| | - M Upasana
- Triesta Sciences , Health Care Global Enterprises Ltd., Bangalore, Karnataka, India; Health Care Global Enterprises Ltd., Bangalore, Karnataka, India; Strand Center for Genomics and Personalized Medicine, Bangalore, Karnataka, India
| | - S Chodhury
- Triesta Sciences , Health Care Global Enterprises Ltd., Bangalore, Karnataka, India; Health Care Global Enterprises Ltd., Bangalore, Karnataka, India; Strand Center for Genomics and Personalized Medicine, Bangalore, Karnataka, India
| | - AU Mannan
- Triesta Sciences , Health Care Global Enterprises Ltd., Bangalore, Karnataka, India; Health Care Global Enterprises Ltd., Bangalore, Karnataka, India; Strand Center for Genomics and Personalized Medicine, Bangalore, Karnataka, India
| | - S Southekal
- Triesta Sciences , Health Care Global Enterprises Ltd., Bangalore, Karnataka, India; Health Care Global Enterprises Ltd., Bangalore, Karnataka, India; Strand Center for Genomics and Personalized Medicine, Bangalore, Karnataka, India
| | - C Manjima
- Triesta Sciences , Health Care Global Enterprises Ltd., Bangalore, Karnataka, India; Health Care Global Enterprises Ltd., Bangalore, Karnataka, India; Strand Center for Genomics and Personalized Medicine, Bangalore, Karnataka, India
| | - S Patil
- Triesta Sciences , Health Care Global Enterprises Ltd., Bangalore, Karnataka, India; Health Care Global Enterprises Ltd., Bangalore, Karnataka, India; Strand Center for Genomics and Personalized Medicine, Bangalore, Karnataka, India
| | - K Murugan
- Triesta Sciences , Health Care Global Enterprises Ltd., Bangalore, Karnataka, India; Health Care Global Enterprises Ltd., Bangalore, Karnataka, India; Strand Center for Genomics and Personalized Medicine, Bangalore, Karnataka, India
| | - B Mahesh
- Triesta Sciences , Health Care Global Enterprises Ltd., Bangalore, Karnataka, India; Health Care Global Enterprises Ltd., Bangalore, Karnataka, India; Strand Center for Genomics and Personalized Medicine, Bangalore, Karnataka, India
| | - R Nayak
- Triesta Sciences , Health Care Global Enterprises Ltd., Bangalore, Karnataka, India; Health Care Global Enterprises Ltd., Bangalore, Karnataka, India; Strand Center for Genomics and Personalized Medicine, Bangalore, Karnataka, India
| | - PSS Sridhar
- Triesta Sciences , Health Care Global Enterprises Ltd., Bangalore, Karnataka, India; Health Care Global Enterprises Ltd., Bangalore, Karnataka, India; Strand Center for Genomics and Personalized Medicine, Bangalore, Karnataka, India
| | - N Rao
- Triesta Sciences , Health Care Global Enterprises Ltd., Bangalore, Karnataka, India; Health Care Global Enterprises Ltd., Bangalore, Karnataka, India; Strand Center for Genomics and Personalized Medicine, Bangalore, Karnataka, India
| | - N Krishnamoorthy
- Triesta Sciences , Health Care Global Enterprises Ltd., Bangalore, Karnataka, India; Health Care Global Enterprises Ltd., Bangalore, Karnataka, India; Strand Center for Genomics and Personalized Medicine, Bangalore, Karnataka, India
| | - V Gupta
- Triesta Sciences , Health Care Global Enterprises Ltd., Bangalore, Karnataka, India; Health Care Global Enterprises Ltd., Bangalore, Karnataka, India; Strand Center for Genomics and Personalized Medicine, Bangalore, Karnataka, India
| | - CT Satheesh
- Triesta Sciences , Health Care Global Enterprises Ltd., Bangalore, Karnataka, India; Health Care Global Enterprises Ltd., Bangalore, Karnataka, India; Strand Center for Genomics and Personalized Medicine, Bangalore, Karnataka, India
| | - K Subramanian
- Triesta Sciences , Health Care Global Enterprises Ltd., Bangalore, Karnataka, India; Health Care Global Enterprises Ltd., Bangalore, Karnataka, India; Strand Center for Genomics and Personalized Medicine, Bangalore, Karnataka, India
| | - BS Ajaikumar
- Triesta Sciences , Health Care Global Enterprises Ltd., Bangalore, Karnataka, India; Health Care Global Enterprises Ltd., Bangalore, Karnataka, India; Strand Center for Genomics and Personalized Medicine, Bangalore, Karnataka, India
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Manikandan A, Subramanian K. Evaluation of Zeolite Based Nitrogen Nano-fertilizers on Maize Growth, Yield and Quality on Inceptisols and Alfisols. ACTA ACUST UNITED AC 2016. [DOI: 10.9734/ijpss/2016/22103] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [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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Selvam R, Prakash G, Subramanian K. Tunable anchoring groups@acridone-linked triphenylamine based pendant chromophores and their effects on the photovoltaic performance as sensitizers for dye-sensitized solar cells. RSC Adv 2016. [DOI: 10.1039/c6ra24371a] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023] Open
Abstract
In this study, a series of pendant chromophores bearing methacrylate polymers with different anchoring/acceptor groups were synthesized for use as sensitizers in the dye-sensitized solar cells.
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Affiliation(s)
- R. Selvam
- Department of Chemistry
- Anna University
- Chennai-600 025
- India
| | - G. Prakash
- Department of Chemistry
- Anna University
- Chennai-600 025
- India
| | - K. Subramanian
- Department of Chemistry
- Anna University
- Chennai-600 025
- India
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Kanawade RB, Vaidya PD, Subramanian K, Kulkarni VV, Kenig EY. On the Acceleration of CO2 Reaction with N-Ethyldiethanolamine in Aqueous Solutions by the Addition of Promoters. Ind Eng Chem Res 2015. [DOI: 10.1021/acs.iecr.5b02496] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Ravindra B. Kanawade
- Department
of Chemical Engineering, Institute of Chemical Technology, Nathalal Parekh Marg, Matunga, Mumbai, 400019, India
| | - Prakash D. Vaidya
- Department
of Chemical Engineering, Institute of Chemical Technology, Nathalal Parekh Marg, Matunga, Mumbai, 400019, India
| | - K. Subramanian
- Amines and Plasticizers Limited, D 21/21A, TTC
Industrial Area, Turbhe, Navi Mumbai, 400075, India
| | - Vijay V. Kulkarni
- Amines and Plasticizers Limited, D 21/21A, TTC
Industrial Area, Turbhe, Navi Mumbai, 400075, India
| | - Eugeny Y. Kenig
- Faculty
of Mechanical Engineering, Chair of Fluid Process Engineering, University of Paderborn, D-33098 Paderborn, Germany
- Gubkin Russian State University of Oil and Gas, 119991 Moscow, Russian Federation
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Jain G, White A, Carmichael P, Krishnakumar N, Rajeshwara N, Subramanian K, Das S, Cooper S, Vethamanickam J, Middleton A, Glavin S, Raghavan A. A systems biology model of oxidative stress that distinguishes adaptive and adverse cellular responses. Toxicol Lett 2015. [DOI: 10.1016/j.toxlet.2015.08.583] [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: 10/23/2022]
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Govindhan M, Subramanian K, Chennakesava Rao K, Easwaramoorthi K, Senthilkumar P, Perumal PT. Synthesis of novel 4-hydroxycoumarin derivatives: evaluation of antimicrobial, antioxidant activities and its molecular docking studies. Med Chem Res 2015. [DOI: 10.1007/s00044-015-1448-z] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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44
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Dhanapal V, Subramanian K. Recycling of reactive dye using semi-interpenetrating polymer network from sodium alginate and isopropyl acrylamide. J Appl Polym Sci 2015. [DOI: 10.1002/app.41436] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- V. Dhanapal
- Department of Physical Sciences; Bannari Amman Institute of Technology; Sathyamangalam 638401 Erode Dt, Tamil Nadu India
| | - K. Subramanian
- Department of Biotechnology; Bannari Amman Institute of Technology; Sathyamangalam 638401 Erode Dt, Tamil Nadu India
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Hariharan A, Subramanian K, Alagar M, Dinakaran K. Conjugated donor–acceptor copolymers derived from phenylenevinylene and trisubstituted pyridine units. HIGH PERFORM POLYM 2014. [DOI: 10.1177/0954008314559312] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Copolymers having intramolecular donor–acceptor systems encompassing trisubstituted pyridine derivatives as acceptor and phenylenevinylene (PPV) unit as a donor segment were synthesized. In addition, thiophene-containing random terpolymer PPVPYT via palladium-catalyzing Heck coupling reaction is reported. The novel-substituted pyridine monomers (PYBr) are synthesized by adopting a one-pot synthesis method using p-toluenesulfonic acid as catalyst in ethanol medium, which results in an excellent yield of about 95%. All the copolymers Poly phenylenevinylene-co-Pyridine derivatives (PPVPY) and terpolymers of Polyphenylenevinylene-co-Pyridine and Thiophene (PPVPYT) are found to be soluble in organic solvents, such as tetrahydrofuran, chloroform, and N, N-dimethylformamide. The molecular weights of the synthesized polymers were characterized by gel permeation chromatography (GPC), and their chemical structures were confirmed by infra red and nuclear magnetic resonance spectroscopies. The electrochemical band gaps of PPVPY-1, PPVPY-2, and PPVPY-3 copolymers are estimated to be 2.55, 2.48, and 2.0, respectively. Similarly, the band gap of PPVPY75T25, PPVPY50T50, and PPVPY25T75 random copolymers are estimated as 2.31, 1.95, and 2.23, respectively. These polymers also show excellent optical and thermal properties.
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Affiliation(s)
- A. Hariharan
- Department of Chemistry, Anna University, Chennai, Tamil Nadu, India
| | - K. Subramanian
- Department of Chemistry, Anna University, Chennai, Tamil Nadu, India
| | - M. Alagar
- Department of Chemical Engineering, Anna University, Chennai, Tamil Nadu, India
| | - K. Dinakaran
- Department of Chemistry, Thiruvalluvar University, Vellore, Tamil Nadu, India
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Dhanapal V, Subramanian K. Recycling of textile dye using double network polymer from sodium alginate and superabsorbent polymer. Carbohydr Polym 2014; 108:65-74. [DOI: 10.1016/j.carbpol.2014.03.013] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2014] [Revised: 02/18/2014] [Accepted: 03/05/2014] [Indexed: 11/30/2022]
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Pramila M, Manikandan S, Anju K, Murali Kannan M, Hong S, Maruthamuthu S, Subramanian K. Electrochemical decolorization and degradation of Turquoise Blue G (TBG) by pre-adapted petroleum degrading bacteria. Sep Purif Technol 2014. [DOI: 10.1016/j.seppur.2014.06.026] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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48
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Dhanapal V, Subramanian K. Recycling of reactive dye using semi-interpenetrating polymer network from sodium alginate and isopropyl acrylamide. J Appl Polym Sci 2014. [DOI: 10.1002/app.40968] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- V. Dhanapal
- Department of Physical Sciences; Bannari Amman Institute of Technology; Sathyamangalam 638401 Erode Dt, Tamil Nadu India
| | - K. Subramanian
- Department of Biotechnology; Bannari Amman Institute of Technology; Sathyamangalam 638401 Erode Dt, Tamil Nadu India
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Subramanian K, Winarsih I, Keerthani C, Ho B, Ding JL. Preferential silent survival of intracellular bacteria in hemoglobin-primed macrophages. J Innate Immun 2014; 6:515-29. [PMID: 24685988 DOI: 10.1159/000358236] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2013] [Accepted: 12/27/2013] [Indexed: 11/19/2022] Open
Abstract
Hemolysis releases hemoglobin (Hb), a prooxidant, into circulation. While the heme iron is a nutrient for the invading pathogens, it releases ROS, which is both microbicidal and cytotoxic, making it a double-edged sword. Previously, we found a two-pass detoxification mechanism involving the endocytosis of Hb into monocytes in collaboration with vascular endothelial cells to overcome oxidative damage. This prompted us to examine the effect of Hb priming on host cell viability and intracellular bacterial clearance during a hemolytic infection. Here, we demonstrate that Hb-primed macrophages harbor a higher intracellular bacterial load but with suppressed apoptosis. p-ERK and p-p38 MAPK were significantly downregulated, with concomitant impairment of Bax and downstream caspases. The Hb-primed cells harboring intracellular bacteria upregulated anti-inflammatory IL-10 and downregulated proinflammatory TNF-α, which further enhanced the infectivity of the neighboring cells. Our findings suggest that opportunistic intracellular pathogens exploit the Hb-scavenging machinery of the host to silently persist within the circulating phagocytes by suppressing apoptosis while escaping immune surveillance.
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Affiliation(s)
- Karthik Subramanian
- Department of Biological Sciences, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
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Srinivasan K, Thiruppathiraja C, Subramanian K, Dinakaran K. Sensitive detection of C. parvum using near infrared emitting Ag2S@silica core–shell nanospheres. RSC Adv 2014. [DOI: 10.1039/c4ra10833g] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
Optical detection ofC. parvumin environmental samples using anti-oocysts McAb immobilized NIR emitting Ag2S@silica core–shell nanospheres as immunosensors is reported.
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Affiliation(s)
- K. Srinivasan
- Department of Chemistry
- MIT campus
- Anna University
- Chennai – 600 044, India
| | - C. Thiruppathiraja
- Division of Proteomics and Nanobiotechnology
- Science for Life Laboratory
- KTH-Royal Institute of Technology
- Stockholm, Sweden
| | - K. Subramanian
- Department of Chemistry
- MIT campus
- Anna University
- Chennai – 600 044, India
| | - K. Dinakaran
- Department of Chemistry
- Thiruvalluvar University
- Vellore – 632 115, India
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