1
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Heist RS, Sands J, Bardia A, Shimizu T, Lisberg A, Krop I, Yamamoto N, Kogawa T, Al-Hashimi S, Fung SSM, Galor A, Pisetzky F, Basak P, Lau C, Meric-Bernstam F. Clinical management, monitoring, and prophylaxis of adverse events of special interest associated with datopotamab deruxtecan. Cancer Treat Rev 2024; 125:102720. [PMID: 38502995 DOI: 10.1016/j.ctrv.2024.102720] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2024] [Revised: 03/07/2024] [Accepted: 03/10/2024] [Indexed: 03/21/2024]
Abstract
Antibody drug conjugates (ADCs) are an emerging class of treatments designed to improve efficacy and decrease toxicity compared with other systemic therapies through the selective delivery of cytotoxic agents to tumor cells. Datopotamab deruxtecan (Dato-DXd) is a novel ADC comprising a topoisomerase I inhibitor payload and a monoclonal antibody directed to trophoblast cell-surface antigen 2 (TROP2), a protein that is broadly expressed in several types of solid tumors. Dato-DXd is being investigated across multiple solid tumor indications. In the ongoing, first-in-human TROPION-PanTumor01 phase I study (ClinicalTrials.gov: NCT03401385), encouraging and durable antitumor activity and a manageable safety profile was demonstrated in patients with advanced/metastatic hormone receptor-positive/human epidermal growth factor receptor2-negative breast cancer (HR+/HER2- BC), triple-negative breast cancer (TNBC), and non-small cell lung cancer (NSCLC). Improved understanding of the adverse events (AEs) that are associated with Dato-DXd and their optimal management is essential to ensure safe and successful administration. Interstitial lung disease/pneumonitis, infusion-related reactions, oral mucositis/stomatitis, and ocular surface events have been identified as AEs of special interest (AESIs) for which appropriate prevention, monitoring, and management is essential. This article summarizes the incidence of AESIs among patients with HR+/HER2- BC, TNBC, and NSCLC reported in TROPION-PanTumor01. We report our recommendations for AESI prophylaxis, early detection, and management, using experience gained from treating AESIs that occur with Dato-DXd in clinical trials.
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Affiliation(s)
- Rebecca S Heist
- Department of Medicine, Massachusetts General Hospital Cancer Center, Harvard Medical School, Harvard University, Boston, MA, USA.
| | - Jacob Sands
- Thoracic Oncology, Dana-Farber Cancer Institute, Harvard Medical School, Boston, MA, USA
| | - Aditya Bardia
- Department of Medicine, Division of Hematology and Oncology, David Geffen School of Medicine, University of California Los Angeles (UCLA), Los Angeles, CA, USA
| | - Toshio Shimizu
- Department of Pulmonary Medicine and Medical Oncology, Wakayama Medical University Hospital, Wakayama Medical University Graduate School of Medicine, Wakayama, Japan
| | - Aaron Lisberg
- Department of Medicine, Division of Hematology and Oncology, David Geffen School of Medicine, University of California Los Angeles (UCLA), Los Angeles, CA, USA
| | - Ian Krop
- Yale Cancer Center, New Haven, CT, USA
| | - Noboru Yamamoto
- Department of Experimental Therapeutics, National Cancer Center Hospital, Tokyo, Japan
| | - Takahiro Kogawa
- Department of Advanced Medical Development, Cancer Institute Hospital of Japanese Foundation for Cancer Research, Tokyo, Japan
| | - Saba Al-Hashimi
- Department of Ophthalmology, UCLA Stein Eye Institute, David Geffen School of Medicine, University of California Los Angeles (UCLA), Los Angeles, CA, USA
| | - Simon S M Fung
- Department of Ophthalmology, UCLA Stein Eye Institute, David Geffen School of Medicine, University of California Los Angeles (UCLA), Los Angeles, CA, USA
| | - Anat Galor
- Bascom Palmer Eye Institute, Miller School of Medicine, University of Miami, FL, USA; Research Services, Miami Veterans Affairs Medical Center, Miami, FL, USA
| | - Francesca Pisetzky
- Clinical Safety and Pharmacovigilence, Daiichi Sankyo, Inc., Schiphol-Rijk, The Netherlands
| | - Priyanka Basak
- Clinical Safety and Pharmacovigilance, Daiichi Sankyo, Inc., Basking Ridge, NJ, USA
| | - Cindy Lau
- Clinical Safety and Pharmacovigilance, Daiichi Sankyo, Inc., Basking Ridge, NJ, USA
| | - Funda Meric-Bernstam
- Department of Investigational Cancer Therapeutics, MD Anderson Cancer Center, University of Texas, Houston, TX, USA
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2
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Naha S, Basak P, Sands K, Milton R, Carvalho MJ, Mitra S, Bhattacharjee A, Sinha A, Mukherjee S, Saha B, Chattopadhyay P, Chakravorty PS, Nandy RK, Dutta S, Walsh TR, Basu S. Carriage and within-host diversity of mcr-1.1-harbouring Escherichia coli from pregnant mothers: inter- and intra-mother transmission dynamics of mcr-1.1. Emerg Microbes Infect 2023; 12:2278899. [PMID: 37929689 PMCID: PMC10773534 DOI: 10.1080/22221751.2023.2278899] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2023] [Accepted: 10/30/2023] [Indexed: 11/07/2023]
Abstract
Exchange of antimicrobial resistance genes via mobile genetic elements occur in the gut which can be transferred from mother to neonate during birth. This study is the first to analyse transmissible colistin resistance gene, mcr, in pregnant mothers and neonates. Samples were collected from pregnant mothers (rectal) and septicaemic neonates (rectal and blood) and analysed for the presence of mcr, its transmissibility, genome diversity, and exchange of mcr between isolates within an individual and across different individuals (not necessarily mother-baby pairs). mcr-1.1 was detected in rectal samples of pregnant mothers (n = 10, 0.9%), but not in neonates. All mcr-positive mothers gave birth to healthy neonates from whom rectal specimen were not collected. Hence, the transmission of mcr between these mother-neonate pairs could not be studied. mcr-1.1 was noted only in Escherichia coli (phylogroup A & B1), and carried few resistance and virulence genes. Isolates belonged to diverse sequence types (n = 11) with two novel STs (ST12452, ST12455). mcr-1.1 was borne on conjugative IncHI2 bracketed between ISApl1 on Tn6630, and the plasmids exhibited similarities in sequences across the study isolates. Phylogenetic comparison showed that study isolates were related to mcr-positive isolates of animal origin from Southeast Asian countries. Spread of mcr-1.1 within this study occurred either via similar mcr-positive clones or similar mcr-bearing plasmids in mothers. Though this study could not build evidence for mother-baby transmission but the presence of such genes in the maternal specimen may enhance the chances of transmission to neonates.
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Affiliation(s)
- Sharmi Naha
- Division of Bacteriology, ICMR-National Institute of Cholera and Enteric Diseases, Kolkata, India
| | - Priyanka Basak
- Division of Bacteriology, ICMR-National Institute of Cholera and Enteric Diseases, Kolkata, India
| | - Kirsty Sands
- Institute of Infection and Immunity, Cardiff University, Cardiff, UK
- Department of Zoology, Ineos Oxford Institute of Antimicrobial Research, University of Oxford, Oxford, UK
| | - Rebecca Milton
- Institute of Infection and Immunity, Cardiff University, Cardiff, UK
- Centre for Trials Research, Cardiff University, Cardiff, UK
| | - Maria J. Carvalho
- Institute of Infection and Immunity, Cardiff University, Cardiff, UK
- Department of Medical Sciences, Institute of Biomedicine, University of Aveiro, Aveiro, Portugal
| | - Shravani Mitra
- Division of Bacteriology, ICMR-National Institute of Cholera and Enteric Diseases, Kolkata, India
| | - Amrita Bhattacharjee
- Division of Bacteriology, ICMR-National Institute of Cholera and Enteric Diseases, Kolkata, India
| | - Anuradha Sinha
- Division of Bacteriology, ICMR-National Institute of Cholera and Enteric Diseases, Kolkata, India
| | - Suchandra Mukherjee
- Department of Neonatology, Institute of Post-Graduate and Medical Education & Research, Kolkata, India
| | - Bijan Saha
- Department of Neonatology, Institute of Post-Graduate and Medical Education & Research, Kolkata, India
| | - Pinaki Chattopadhyay
- Department of Neonatology, Institute of Post-Graduate and Medical Education & Research, Kolkata, India
| | - Partha Sarathi Chakravorty
- Department of Obstetrics & Gynecology, Institute of Post-Graduate and Medical Education & Research, Kolkata, India
| | - Ranjan Kumar Nandy
- Division of Bacteriology, ICMR-National Institute of Cholera and Enteric Diseases, Kolkata, India
| | - Shanta Dutta
- Division of Bacteriology, ICMR-National Institute of Cholera and Enteric Diseases, Kolkata, India
| | - Timothy R. Walsh
- Institute of Infection and Immunity, Cardiff University, Cardiff, UK
- Department of Zoology, Ineos Oxford Institute of Antimicrobial Research, University of Oxford, Oxford, UK
| | - Sulagna Basu
- Division of Bacteriology, ICMR-National Institute of Cholera and Enteric Diseases, Kolkata, India
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3
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Basak P, Cabelli DE, Chivers PT, Farquhar ER, Maroney MJ. In vitro maturation of NiSOD reveals a role for cytoplasmic histidine in processing and metalation. Metallomics 2023; 15:mfad054. [PMID: 37723610 PMCID: PMC10628968 DOI: 10.1093/mtomcs/mfad054] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2023] [Accepted: 09/16/2023] [Indexed: 09/20/2023]
Abstract
The importance of cellular low molecular weight ligands in metalloenzyme maturation is largely unexplored. Maturation of NiSOD requires post-translational N-terminal processing of the proenzyme, SodN, by its cognate protease, SodX. Here we provide evidence for the participation of L-histidine in the protease-dependent maturation of nickel-dependent superoxide dismutase (NiSOD) from Streptomyces coelicolor. In vitro studies using purified proteins cloned from S. coelicolor and overexpressed in E. coli support a model where a ternary complex formed between the substrate (SodN), the protease (SodX) and L-Histidine creates a novel Ni-binding site that is capable of the N-terminal processing of SodN and specifically incorporates Ni into the apo-NiSOD product. Thus, L-Histidine serves many of the functions associated with a metallochaperone or, conversely, eliminates the need for a metallochaperone in NiSOD maturation.
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Affiliation(s)
- Priyanka Basak
- Department of Chemistry, University of Massachusetts, Amherst, MA 01003, USA
| | - Diane E Cabelli
- Department of Chemistry, Brookhaven National Laboratory, Upton, NY 11973, USA
| | - Peter T Chivers
- Departments of Biosciences and Chemistry, Durham University, Durham, DH1 3LE, UK
| | - Erik R Farquhar
- National Synchrotron Light Source-II, Brookhaven National Laboratory, Upton, NY 11973, USA
| | - Michael J Maroney
- Department of Chemistry, University of Massachusetts, Amherst, MA 01003, USA
- Program in Molecular and Cellular Biology, University of Massachusetts, Amherst, MA 01003, USA
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Levy BP, Felip E, Reck M, Yang JC, Cappuzzo F, Yoneshima Y, Zhou C, Rawat S, Xie J, Basak P, Xu L, Sands J. TROPION-Lung08: phase III study of datopotamab deruxtecan plus pembrolizumab as first-line therapy for advanced NSCLC. Future Oncol 2023; 19:1461-1472. [PMID: 37249038 DOI: 10.2217/fon-2023-0230] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/31/2023] Open
Abstract
Pembrolizumab monotherapy is a standard first-line treatment for PD-L1-high advanced non-small-cell lung cancer (NSCLC) without actionable genomic alterations (AGA). However, few patients experience long-term disease control, highlighting the need for more effective therapies. Datopotamab deruxtecan (Dato-DXd), a novel trophoblast cell-surface antigen 2-directed antibody-drug conjugate, showed encouraging safety and antitumor activity with pembrolizumab in advanced NSCLC. We describe the rationale and design of TROPION-Lung08, a phase III study evaluating safety and efficacy of first-line Dato-DXd plus pembrolizumab versus pembrolizumab monotherapy in patients with advanced/metastatic NSCLC without AGAs and with PD-L1 tumor proportion score ≥50%. Primary end points are progression-free survival and overall survival; secondary end points include objective response rate, duration of response, safety and presence of antidrug antibodies. Clinical trial registration: NCT05215340 (ClinicalTrials.gov).
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Affiliation(s)
- Benjamin P Levy
- The Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins Medicine, Washington, DC 20016, USA
| | - Enriqueta Felip
- Vall d'Hebron University Hospital, Vall d'Hebron Institute of Oncology, Barcelona, 08035, Spain
| | - Martin Reck
- Lung Clinic Grosshansdorf, Airway Research Center North (ARCN), Grosshansdorf, 22927, Germany
| | - James Ch Yang
- Department of Oncology, National Taiwan University Hospital, Taipei, 106, Taiwan
| | | | - Yasuto Yoneshima
- Department of Respiratory Medicine, Graduate School of Medical Sciences, Kyushu University, Fukuoka, 812-8582, Japan
| | - Caicun Zhou
- Department of Oncology, Shanghai Pulmonary Hospital & Thoracic Cancer Institute, School of Medicine, Tongji University, Shanghai, 200092, China
| | | | - Jingdong Xie
- Daiichi Sankyo, Inc, Basking Ridge, NJ 07920, USA
| | | | - Lu Xu
- Merck & Co., Inc., Rahway, NJ 07065, USA
- AstraZeneca, Gaithersburg, MD 20878, USA
| | - Jacob Sands
- Dana-Farber Cancer Institute, Boston, MA 02215, USA
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5
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Das S, Priyadarshani N, Basak P, Maitra P, Bhattacharya S, Bhattacharya SS. Capsaicin derived from endemic chili landraces combats Shigella pathogen: Insights on intracellular inhibition mechanism. Microb Pathog 2023; 181:106210. [PMID: 37343896 DOI: 10.1016/j.micpath.2023.106210] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2023] [Revised: 06/16/2023] [Accepted: 06/18/2023] [Indexed: 06/23/2023]
Abstract
Ethnic tribals in northeast India have been growing and maintaining local chili landraces for ages. These chilies are known for their characteristic pungency and immense therapeutic properties. Capsaicin, a significant chili metabolite, is recognized as a natural drug for pain relief, diabetic neuropathy, psoriasis, arthritis, etc. In this study, we tried to observe the influence of locality factors on the pungency and bioactive features of Capsicum annuum L. landraces. We also checked the gastro-protective ability of these chilies, especially in the cure of shigellosis. Phytometabolite characterization and estimation were done through spectrophotometric methods. Preparative and analytical HPLC techniques were employed for extracting and purifying capsaicin-enriched fractions. Shigella flexneri growth retardation was determined through the broth dilution method. Gentamicin protection assay and ELISA were done to assess the intracellular invasion and IL-1β inflammasome production by S.flexneri. The correlation analyses postulated that phenols, flavonoids, chlorophylls, β-carotene, and capsaicin synthase upregulation strongly influenced capsaicin biosynthesis in chili cultivars. Correspondingly, the inhibitory efficacy of the HPLC-purified Balijuri-derived capsaicin was more effective than the Raja-derived capsaicin in inhibiting intracellular Shigella growth. Reduced levels of pro-inflammatory cytokine (IL1β) in capsaicin-treated Shigella-infected cells probably reduced inflammation-mediated intestinal damage, limiting bacterial spread. This investigation advocates the unique potential of local chilies in curing deadly 'shigellosis' with mechanistic evidence. Our observation justifies the traditional healing practices of the ethnic people of NE India.
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Affiliation(s)
- Subhasish Das
- Department of Environmental Science, Pachhunga University College, Mizoram University (A Central University), Aizawl, 796001, Mizoram, India.
| | - Nayana Priyadarshani
- Soil Agro Bio-engineering Laboratory, Department of Environmental Science, Tezpur University, Sonitpur, 784028, Assam, India
| | - Priyanka Basak
- Department of Biochemistry, ICMR-National Institute of Cholera and Enteric Diseases, Beleghata, Kolkata, 700010, India
| | - Priyanka Maitra
- Department of Biochemistry, ICMR-National Institute of Cholera and Enteric Diseases, Beleghata, Kolkata, 700010, India
| | - Sushmita Bhattacharya
- Department of Biochemistry, ICMR-National Institute of Cholera and Enteric Diseases, Beleghata, Kolkata, 700010, India
| | - Satya Sundar Bhattacharya
- Soil Agro Bio-engineering Laboratory, Department of Environmental Science, Tezpur University, Sonitpur, 784028, Assam, India.
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Abeyrathna SS, Abeyrathna NS, Basak P, Irvine GW, Zhang L, Meloni G. Plastic recognition and electrogenic uniport translocation of 1 st-, 2 nd-, and 3 rd-row transition and post-transition metals by primary-active transmembrane P 1B-2-type ATPase pumps. Chem Sci 2023; 14:6059-6078. [PMID: 37293658 PMCID: PMC10246665 DOI: 10.1039/d3sc00347g] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2023] [Accepted: 05/10/2023] [Indexed: 06/10/2023] Open
Abstract
Transmembrane P1B-type ATPase pumps catalyze the extrusion of transition metal ions across cellular lipid membranes to maintain essential cellular metal homeostasis and detoxify toxic metals. Zn(ii)-pumps of the P1B-2-type subclass, in addition to Zn2+, select diverse metals (Pb2+, Cd2+ and Hg2+) at their transmembrane binding site and feature promiscuous metal-dependent ATP hydrolysis in the presence of these metals. Yet, a comprehensive understanding of the transport of these metals, their relative translocation rates, and transport mechanism remain elusive. We developed a platform for the characterization of primary-active Zn(ii)-pumps in proteoliposomes to study metal selectivity, translocation events and transport mechanism in real-time, employing a "multi-probe" approach with fluorescent sensors responsive to diverse stimuli (metals, pH and membrane potential). Together with atomic-resolution investigation of cargo selection by X-ray absorption spectroscopy (XAS), we demonstrate that Zn(ii)-pumps are electrogenic uniporters that preserve the transport mechanism with 1st-, 2nd- and 3rd-row transition metal substrates. Promiscuous coordination plasticity, guarantees diverse, yet defined, cargo selectivity coupled to their translocation.
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Affiliation(s)
- Sameera S Abeyrathna
- Department of Chemistry and Biochemistry, The University of Texas at Dallas Richardson TX 75080 USA
| | - Nisansala S Abeyrathna
- Department of Chemistry and Biochemistry, The University of Texas at Dallas Richardson TX 75080 USA
| | - Priyanka Basak
- Department of Chemistry and Biochemistry, The University of Texas at Dallas Richardson TX 75080 USA
| | - Gordon W Irvine
- Department of Chemistry and Biochemistry, The University of Texas at Dallas Richardson TX 75080 USA
| | - Limei Zhang
- Department of Biochemistry and Redox Biology Center and the Nebraska Center for Integrated Biomolecular Communication, University of Nebraska-Lincoln Lincoln NE 68588 USA
| | - Gabriele Meloni
- Department of Chemistry and Biochemistry, The University of Texas at Dallas Richardson TX 75080 USA
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Khan U, Karmakar BC, Basak P, Paul S, Gope A, Sarkar D, Mukhopadhyay AK, Dutta S, Bhattacharya S. Glycyrrhizin, an inhibitor of HMGB1 induces autolysosomal degradation function and inhibits Helicobacter pylori infection. Mol Med 2023; 29:51. [PMID: 37038107 PMCID: PMC10088177 DOI: 10.1186/s10020-023-00641-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2022] [Accepted: 03/21/2023] [Indexed: 04/12/2023] Open
Abstract
BACKGROUND Helicobacter pylori is a key agent for causing gastric complications linked with gastric disorders. In response to infection, host cells stimulate autophagy to maintain cellular homeostasis. However, H. pylori have evolved the ability to usurp the host's autophagic machinery. High mobility group box1 (HMGB1), an alarmin molecule is a regulator of autophagy and its expression is augmented during infection and gastric cancer. Therefore, this study aims to explore the role of glycyrrhizin (a known inhibitor of HMGB1) in autophagy during H. pylori infection. MAIN METHODS Human gastric cancer (AGS) cells were infected with the H. pylori SS1 strain and further treatment was done with glycyrrhizin. Western blot was used to examine the expression of autophagy proteins. Autophagy and lysosomal activity were monitored by fluorescence assays. A knockdown of HMGB1 was performed to verify the effect of glycyrrhizin. H. pylori infection in in vivo mice model was established and the effect of glycyrrhizin treatment was studied. RESULTS The autophagy-lysosomal pathway was impaired due to an increase in lysosomal membrane permeabilization during H. pylori infection in AGS cells. Subsequently, glycyrrhizin treatment restored the lysosomal membrane integrity. The recovered lysosomal function enhanced autolysosome formation and concomitantly attenuated the intracellular H. pylori growth by eliminating the pathogenic niche. Additionally, glycyrrhizin treatment inhibited inflammation and improved gastric tissue damage in mice. CONCLUSION This study showed that inhibiting HMGB1 restored lysosomal activity to ameliorate H. pylori infection. It also demonstrated the potential of glycyrrhizin as an antibacterial agent to address the problem of antimicrobial resistance.
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Affiliation(s)
- Uzma Khan
- Division of Biochemistry ICMR-NICED, ICMR-National Institute of Cholera and Enteric Diseases (ICMR-NICED), Kolkata, 700010, India
| | - Bipul Chandra Karmakar
- Division of Bacteriology ICMR-NICED, ICMR-National Institute of Cholera and Enteric Diseases (ICMR-NICED), Kolkata, 700010, India
| | - Priyanka Basak
- Division of Biochemistry ICMR-NICED, ICMR-National Institute of Cholera and Enteric Diseases (ICMR-NICED), Kolkata, 700010, India
| | - Sangita Paul
- Division of Bacteriology ICMR-NICED, ICMR-National Institute of Cholera and Enteric Diseases (ICMR-NICED), Kolkata, 700010, India
| | - Animesh Gope
- Division of Clinical Medicine, ICMR-NICED, ICMR- National Institute of Cholera and Enteric Diseases (ICMR-NICED), Kolkata, India
| | - Deotima Sarkar
- Division of Biochemistry ICMR-NICED, ICMR-National Institute of Cholera and Enteric Diseases (ICMR-NICED), Kolkata, 700010, India
| | - Asish Kumar Mukhopadhyay
- Division of Bacteriology ICMR-NICED, ICMR-National Institute of Cholera and Enteric Diseases (ICMR-NICED), Kolkata, 700010, India
| | - Shanta Dutta
- Division of Bacteriology ICMR-NICED, ICMR-National Institute of Cholera and Enteric Diseases (ICMR-NICED), Kolkata, 700010, India
| | - Sushmita Bhattacharya
- Division of Biochemistry ICMR-NICED, ICMR-National Institute of Cholera and Enteric Diseases (ICMR-NICED), Kolkata, 700010, India.
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Zambelli B, Basak P, Hu H, Piccioli M, Musiani F, Broll V, Imbert L, Boisbouvier J, Maroney MJ, Ciurli S. The structure of the high-affinity nickel-binding site in the Ni,Zn-HypA•UreE2 complex. Metallomics 2023; 15:mfad003. [PMID: 36638839 PMCID: PMC10001889 DOI: 10.1093/mtomcs/mfad003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2022] [Accepted: 01/11/2023] [Indexed: 01/15/2023]
Abstract
The maturation pathway for the nickel-dependent enzyme urease utilizes the protein UreE as a metallochaperone to supply Ni(II) ions. In Helicobacter pylori urease maturation also requires HypA and HypB, accessory proteins that are commonly associated with hydrogenase maturation. Herein we report on the characterization of a protein complex formed between HypA and the UreE2 dimer. Nuclear magnetic resonance (NMR) coupled with molecular modelling show that the protein complex apo, Zn-HypA•UreE2, forms between the rigorously conserved Met-His-Glu (MHE motif) Ni-binding N-terminal sequence of HypA and the two conserved His102A and His102B located at the dimer interface of UreE2. This complex forms in the absence of Ni(II) and is supported by extensive protein contacts that include the use of the C-terminal sequences of UreE2 to form additional strands of β-sheet with the Ni-binding domain of HypA. The Ni-binding properties of apo, Zn-HypA•UreE2 and the component proteins were investigated by isothermal titration calorimetry using a global fitting strategy that included all of the relevant equilibria, and show that the Ni,Zn-HypA•UreE2 complex contains a single Ni(II)-binding site with a sub-nanomolar KD. The structural features of this novel Ni(II) site were elucidated using proteins produced with specifically deuterated amino acids, protein point mutations, and the analyses of X-ray absorption spectroscopy, hyperfine shifted NMR features, as well as molecular modeling coupled with quantum-mechanical calculations. The results show that the complex contains a six-coordinate, high-spin Ni(II) site with ligands provided by both component proteins.
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Affiliation(s)
- Barbara Zambelli
- Laboratory of Bioinorganic Chemistry, Department of Pharmacy and Biotechnology, University of Bologna, Bologna,Italy
| | - Priyanka Basak
- Department of Chemistry and Program in Molecular and Cellular Biology, University of Massachusetts, Amherst, MA, USA
| | - Heidi Hu
- Department of Chemistry and Program in Molecular and Cellular Biology, University of Massachusetts, Amherst, MA, USA
| | - Mario Piccioli
- Centre for Magnetic Resonance, Department of Chemistry, University of Florence, Florence Italy
| | - Francesco Musiani
- Laboratory of Bioinorganic Chemistry, Department of Pharmacy and Biotechnology, University of Bologna, Bologna,Italy
| | - Valquiria Broll
- Laboratory of Bioinorganic Chemistry, Department of Pharmacy and Biotechnology, University of Bologna, Bologna,Italy
| | - Lionel Imbert
- Univ. Grenoble Alpes, CNRS, CEA, Institut de Biologie Structurale (IBS), Grenoble, France
| | - Jerome Boisbouvier
- Univ. Grenoble Alpes, CNRS, CEA, Institut de Biologie Structurale (IBS), Grenoble, France
| | - Michael J Maroney
- Department of Chemistry and Program in Molecular and Cellular Biology, University of Massachusetts, Amherst, MA, USA
| | - Stefano Ciurli
- Laboratory of Bioinorganic Chemistry, Department of Pharmacy and Biotechnology, University of Bologna, Bologna,Italy
- Centre for Magnetic Resonance, Department of Chemistry, University of Florence, Florence Italy
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9
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Maitra P, Basak P, Okamoto K, Miyoshi SI, Dutta S, Bhattacharya S. Asiatic acid inhibits intracellular Shigella flexneri growth by inducing antimicrobial peptide gene expression. J Appl Microbiol 2023; 134:6909067. [PMID: 36626757 DOI: 10.1093/jambio/lxac076] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2022] [Revised: 11/17/2022] [Accepted: 12/13/2022] [Indexed: 01/12/2023]
Abstract
AIMS A rapid rise in resistance to conventional antibiotics for Shigella spp. has created a problem in treating shigellosis. Hence, there is an urgent need for new and non-conventional anti-bacterial agents. The aim of this study is to show how Asiatic acid, a plant-derived compound, inhibits the intracellular growth of Shigella flexneri. METHODS AND RESULTS Shigella flexneri sensitive and resistant strains were used for checking antimicrobial activity of Asiatic acid by gentamicin protection assay. Asiatic acid inhibited the intracellular growth of all strains. Gene expression analysis showed antimicrobial peptide (AMP) up-regulation by Asiatic acid in intestinal cells. Further western blot analysis showed that ERK, p38, and JNK are activated by Asiatic acid. ELISA was performed to check IL-8, IL-6, and cathelicidin secretion. The antibacterial effect of Asiatic acid was further verified in an in vivo mouse model. CONCLUSIONS The reason behind the antibacterial activities of Asiatic acid is probably over-expression of antimicrobial peptide genes. Besides, direct antimicrobial activities, antimicrobial peptides also carry immunomodulatory activities. Here, Asiatic acid increased IL-6 and IL-8 secretion to induce inflammation. Overall, Asiatic acid up-regulates antimicrobial peptide gene expression and inhibits intracellular S. flexneri growth. Moreover, Asiatic acid reduced bacterial growth and recovered intestinal tissue damages in in vivo mice model.
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Affiliation(s)
- Priyanka Maitra
- Division of Biochemistry, National Institute of Cholera and Enteric Diseases, Kolkata 700010, India
| | - Priyanka Basak
- Division of Biochemistry, National Institute of Cholera and Enteric Diseases, Kolkata 700010, India
| | - Keinosuke Okamoto
- Collaborative Research Center of Okayama University for Infectious Diseases in India, National Institute of Cholera and Enteric Diseases, Kolkata 700010, India
| | - Shin-Ichi Miyoshi
- Division of Pharmaceutical Sciences, Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, Okayama 700-8558, Japan
| | - Shanta Dutta
- Department of Bacteriology, National Institute of Cholera and Enteric Diseases, Kolkata 700010, India
| | - Sushmita Bhattacharya
- Division of Biochemistry, National Institute of Cholera and Enteric Diseases, Kolkata 700010, India
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10
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Basak P, Maitra P, Khan U, Saha K, Bhattacharya SS, Dutta M, Bhattacharya S. Capsaicin Inhibits Shigella flexneri Intracellular Growth by Inducing Autophagy. Front Pharmacol 2022; 13:903438. [PMID: 35873583 PMCID: PMC9298657 DOI: 10.3389/fphar.2022.903438] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2022] [Accepted: 05/16/2022] [Indexed: 11/13/2022] Open
Abstract
Antibiotic treatment plays an essential role in preventing Shigella infection. However, incidences of global rise in antibiotic resistance create a major challenge to treat bacterial infection. In this context, there is an urgent need for newer approaches to reduce S. flexneri burden. This study largely focuses on the role of the herbal compound capsaicin (Caps) in inhibiting S. flexneri growth and evaluating the molecular mechanism behind bacterial clearance. Here, we show for the first time that Caps inhibits intracellular S. flexneri growth by inducing autophagy. Activation of autophagy by Caps is mediated through transcription factor TFEB, a master regulator of autophagosome biogenesis. Caps induced the nuclear localization of TFEB. Activation of TFEB further induces the gene transcription of autophagosomal genes. Our findings revealed that the inhibition of autophagy by silencing TFEB and Atg5 induces bacterial growth. Hence, Caps-induced autophagy is one of the key factors responsible for bacterial clearance. Moreover, Caps restricted the intracellular proliferation of S. flexneri-resistant strain. The efficacy of Caps in reducing S. flexneri growth was confirmed by an animal model. This study showed for the first time that S. flexneri infection can be inhibited by inducing autophagy. Overall observations suggest that Caps activates TFEB to induce autophagy and thereby combat S. flexneri infection.
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Affiliation(s)
- Priyanka Basak
- Division of Biochemistry, National Institute of Cholera and Enteric Diseases, Kolkata, India
| | - Priyanka Maitra
- Division of Biochemistry, National Institute of Cholera and Enteric Diseases, Kolkata, India
| | - Uzma Khan
- Division of Biochemistry, National Institute of Cholera and Enteric Diseases, Kolkata, India
| | - Kalyani Saha
- Division of Biochemistry, National Institute of Cholera and Enteric Diseases, Kolkata, India
| | | | - Moumita Dutta
- Division of Electron Microscopy, National Institute of Cholera and Enteric Diseases, Kolkata, India
| | - Sushmita Bhattacharya
- Division of Biochemistry, National Institute of Cholera and Enteric Diseases, Kolkata, India
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11
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Levy BP, Reck M, Yang JCH, Cappuzzo F, Rawat S, Xie J, Basak P, Felip E. Datopotamab deruxtecan (Dato-DXd) plus pembrolizumab in treatment-naive advanced/metastatic (adv/met) non–small cell lung cancer (NSCLC) with PD-L1 ≥ 50% and without actionable genomic alterations. J Clin Oncol 2022. [DOI: 10.1200/jco.2022.40.16_suppl.tps3162] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
TPS3162 Background: First-line treatment with immunotherapy has significantly improved survival in patients with adv/met NSCLC. Pembrolizumab (pembro) as monotherapy has shown superior efficacy compared with chemotherapy in treatment-naive patients with advanced NSCLC and PD-L1 expression ≥50%, but most patients will ultimately experience progression. Dato-DXd is an antibody-drug conjugate (ADC) consisting of a humanized anti-TROP2 IgG1 monoclonal antibody attached to a topoisomerase I inhibitor payload via a stable tetrapeptide-based cleavable linker. In the ongoing phase 1 TROPION-PanTumor01 study (NCT03401385; DS1062-A-J101), Dato-DXd 6 mg/kg monotherapy demonstrated an objective response rate (ORR) of 28% and a manageable safety profile in pretreated patients with NSCLC. In addition, preclinical studies showed that DXd ADCs combined with an anti–PD-1 antibody was more effective than monotherapy with either agent alone. The tolerability of Dato-DXd 6 mg/kg in combination with pembrolizumab was confirmed in the phase 1b TROPION-Lung02 trial (NCT04526691; DS1062-A-U102). Here we describe the phase 3 TROPION-Lung08 trial evaluating Dato-DXd combined with pembro in treatment-naive patients with adv/met NSCLC. Methods: TROPION-Lung08 (NCT05215340; DS1062-A-U304) is a global, randomized, open-label, phase 3 trial of Dato-DXd plus pembro vs pembro alone in treatment-naive patients with adv/met non-actionable oncogenic driven NSCLC with PD-L1 ≥50% (as determined by PD-L1 IHC 22C3 pharmDx assay). Approximately 740 patients will be randomized to receive pembro 200 mg plus Dato-DXd 6 mg/kg or pembro 200 mg alone every 21 days until discontinuation or 35 cycles of pembro. Randomization will be stratified by Eastern Cooperative Oncology Group performance status (0 vs 1), histology (squamous vs nonsquamous), geographic region (East Asia vs rest of world), and smoking status (former/current vs never). Patients must have stage IIIB/IIIC NSCLC ineligible for curative treatment or stage IV disease. Patients must not have received prior systemic therapy; if patients received neoadjuvant/adjuvant systemic therapy without immune checkpoint inhibitors, it must have been given ≥6 months before the diagnosis of adv/met disease. The primary endpoints are progression-free survival (assessed by blinded independent central review per Response Evaluation Criteria in Solid Tumors [RECIST] version 1.1) and overall survival, with target hazard ratios of 0.65 and 0.75, respectively. Secondary endpoints include ORR, duration of response, time to response, disease control rate, safety, and antidrug antibody prevalence. Pharmacokinetic parameters, biomarkers, and patient-reported outcomes will also be explored. Clinical trial information: NCT05215340.
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Affiliation(s)
| | - Martin Reck
- Lung Clinic Grosshansdorf, Airway Research Center North, German Center of Lung Research, Grosshansdorf, Germany
| | - James Chih-Hsin Yang
- Department of Medical Oncology, National Taiwan University Cancer Center, Taipei, Taiwan
| | | | | | | | | | - Enriqueta Felip
- Vall d’Hebron Institute of Oncology (VHIO), Barcelona, Spain
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12
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Basak P, Zambelli B, Cabelli DE, Ciurli S, Maroney MJ. Pro5 is not essential for the formation of ‘Ni-hook’ in nickel superoxide dismutase. J Inorg Biochem 2022; 234:111858. [DOI: 10.1016/j.jinorgbio.2022.111858] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2021] [Revised: 03/30/2022] [Accepted: 05/07/2022] [Indexed: 01/23/2023]
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Abeyrathna S, Abeyrathna N, Irvine G, Basak P, Meloni G. Metal Substrate Selectivity and Mechanism of Transport in a Transmembrane Zn‐pump Revealed by
in‐vitro
Real‐time Transport. FASEB J 2021. [DOI: 10.1096/fasebj.2021.35.s1.03159] [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)
- Sameera Abeyrathna
- Department of Chemistry and BiochemistryThe University of Texas at DallasRichardsonTX
| | - Nisansala Abeyrathna
- Department of Chemistry and BiochemistryThe University of Texas at DallasRichardsonTX
| | - Gordon Irvine
- Department of Chemistry and BiochemistryThe University of Texas at DallasRichardsonTX
| | - Priyanka Basak
- Department of Chemistry and BiochemistryThe University of Texas at DallasRichardsonTX
| | - Gabriele Meloni
- Department of Chemistry and BiochemistryThe University of Texas at DallasRichardsonTX
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15
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Lissner MM, Cumnock K, Davis NM, Vilches-Moure JG, Basak P, Navarrete DJ, Allen JA, Schneider D. Metabolic profiling during malaria reveals the role of the aryl hydrocarbon receptor in regulating kidney injury. eLife 2020; 9:60165. [PMID: 33021470 PMCID: PMC7538157 DOI: 10.7554/elife.60165] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2020] [Accepted: 09/17/2020] [Indexed: 12/12/2022] Open
Abstract
Systemic metabolic reprogramming induced by infection exerts profound, pathogen-specific effects on infection outcome. Here, we detail the host immune and metabolic response during sickness and recovery in a mouse model of malaria. We describe extensive alterations in metabolism during acute infection, and identify increases in host-derived metabolites that signal through the aryl hydrocarbon receptor (AHR), a transcription factor with immunomodulatory functions. We find that Ahr-/- mice are more susceptible to malaria and develop high plasma heme and acute kidney injury. This phenotype is dependent on AHR in Tek-expressing radioresistant cells. Our findings identify a role for AHR in limiting tissue damage during malaria. Furthermore, this work demonstrates the critical role of host metabolism in surviving infection.
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Affiliation(s)
- Michelle M Lissner
- Department of Microbiology and Immunology, Stanford University, Stanford, United States
| | - Katherine Cumnock
- Department of Microbiology and Immunology, Stanford University, Stanford, United States
| | - Nicole M Davis
- Department of Microbiology and Immunology, Stanford University, Stanford, United States
| | - José G Vilches-Moure
- Department of Comparative Medicine, Stanford University, Stanford, United States
| | - Priyanka Basak
- Department of Microbiology and Immunology, Stanford University, Stanford, United States
| | - Daniel J Navarrete
- Department of Microbiology and Immunology, Stanford University, Stanford, United States
| | - Jessica A Allen
- Division of Health, Mathematics and Science, Columbia College, Columbia, United States
| | - David Schneider
- Department of Microbiology and Immunology, Stanford University, Stanford, United States
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16
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Xu LC, Nunes C, Wang VR, Saito A, Chen T, Basak P, Chang JJ, Koyama T, Suzuki Y. Distinct nutritional and endocrine regulation of prothoracic gland activities underlies divergent life history strategies in Manduca sexta and Drosophila melanogaster. Insect Biochem Mol Biol 2020; 119:103335. [PMID: 32061770 DOI: 10.1016/j.ibmb.2020.103335] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/28/2019] [Revised: 02/05/2020] [Accepted: 02/10/2020] [Indexed: 06/10/2023]
Abstract
Life history trade-offs lead to various strategies that maximize fitness, but the developmental mechanisms underlying these alternative strategies continue to be poorly understood. In insects, trade-offs exist between size and developmental time. Recent studies in the fruit fly Drosophila melanogaster have suggested that the steroidogenic prothoracic glands play a key role in determining the timing of metamorphosis. In this study, the nutrient-dependent growth and transcriptional activation of prothoracic glands were studied in D. melanogaster and the tobacco hornworm Manduca sexta. In both species, minimum viable weight (MVW) was associated with activation of ecdysteroid biosynthesis genes and growth of prothoracic gland cells. However, the timing of MVW attainment in M. sexta is delayed by the presence of the sesquiterpenoid hormone, juvenile hormone (JH), whereas in D. melanogaster it is not. Moreover, in D. melanogaster, the transcriptional regulation of ecdysteroidogenesis becomes nutrient-independent at the MVW/critical weight (CW) checkpoint. In contrast, in M. sexta, starvation consistently reduced transcriptional activation of ecdysteroid biosynthesis genes even after CW attainment, indicating that the nature of CW differs fundamentally between the two species. In D. melanogaster, the prothoracic glands dictate the timing of metamorphosis even in the absence of nutritional inputs, whereas in M. sexta, prothoracic gland activity is tightly coupled to the nutritional status of the body, thereby delaying the onset of metamorphosis before CW attainment. We propose that selection for survival under unpredictable nutritional availability leads to the evolution of increased modularity in both morphological and endocrine traits.
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Affiliation(s)
- Lily C Xu
- Department of Biological Sciences, Wellesley College, Wellesley, MA, 02481, USA
| | - Catarina Nunes
- Instituto Gulbenkian de Ciência, 2780-156, Oeiras, Portugal
| | - Victoria R Wang
- Department of Biological Sciences, Wellesley College, Wellesley, MA, 02481, USA
| | - Akiho Saito
- Department of Biological Sciences, Wellesley College, Wellesley, MA, 02481, USA
| | - Teresa Chen
- Department of Biological Sciences, Wellesley College, Wellesley, MA, 02481, USA
| | - Priyanka Basak
- Department of Biological Sciences, Wellesley College, Wellesley, MA, 02481, USA
| | - Jane J Chang
- Department of Biological Sciences, Wellesley College, Wellesley, MA, 02481, USA; Biology Department, Bowdoin College, Brunswick, ME, 04011, USA
| | - Takashi Koyama
- Instituto Gulbenkian de Ciência, 2780-156, Oeiras, Portugal; Section for Cell and Neurobiology, Department of Biology, University of Copenhagen, 2100, Copenhagen, Denmark.
| | - Yuichiro Suzuki
- Department of Biological Sciences, Wellesley College, Wellesley, MA, 02481, USA.
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17
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Benavides BS, Acharya R, Clark ER, Basak P, Maroney MJ, Nocek JM, Schanze KS, Kurtz DM. Structural, Photophysical, and Photochemical Characterization of Zinc Protoporphyrin IX in a Dimeric Variant of an Iron Storage Protein: Insights into the Mechanism of Photosensitized H 2 Generation. J Phys Chem B 2019; 123:6740-6749. [PMID: 31294990 DOI: 10.1021/acs.jpcb.9b04817] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Some of us have previously reported the preparation of a dimeric form of the iron storage protein, bacterioferritin (Bfr), in which the native heme b is substituted with the photosensitizer, Zn(II)-protoporphyrin IX (ZnPP-Bfr dimer). We further showed that the ZnPP-Bfr dimer can serve as a photosensitizer for platinum-catalyzed H2 generation in aqueous solution without the usually added electron relay between photosensitizer and platinum ( Clark , E. R. , Inorg. Chem. 2017 , 56 , 4584 - 4593 ). We proposed reductive or oxidative quenching pathways involving the ZnPP anion radical (ZnPP•-) or the ZnPP cation radical, (ZnPP•+), respectively. The present report describes structural, photophysical, and photochemical properties of the ZnPP in the ZnPP-Bfr dimer. X-ray absorption spectroscopic studies at 10 K showed a mixture of five- and six-coordinated Zn centers with axial coordination by one long Zn-SγMet distance of ∼2.8 Å and ∼40% having an additional shorter Zn-S distance of ∼2.4 Å, in addition to the expected 4 nitrogen atom coordination from the porphyrin. The ZnPP in ZnPP-Bfr dimer was prone to photosensitized oxidation to ZnPP•+. The ZnPP•+ was rapidly reduced by ascorbic acid, which we previously determined was essential for photosensitized H2 production in this system. These results are consistent with an oxidative quenching pathway involving electron transfer from 3ZnPP* to platinum, which may be assisted by a flexible ZnPP axial coordination sphere. However, the low quantum yield for H2 production (∼1%) in this system could make reductive quenching difficult to detect, and can, therefore, not be completely ruled out. The ZnPP-Bfr dimer provides a simple but versatile framework for mechanistic assessment and optimization of porphyrin-photosensitized H2 generation without an electron relay between porphyrin and the platinum catalyst.
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Affiliation(s)
- Brenda S Benavides
- Department of Chemistry , University of Texas at San Antonio , San Antonio , Texas 78249 , United States
| | - Rajendra Acharya
- Department of Chemistry , University of Texas at San Antonio , San Antonio , Texas 78249 , United States
| | - Emily R Clark
- Department of Chemistry , University of Texas at San Antonio , San Antonio , Texas 78249 , United States
| | - Priyanka Basak
- Department of Chemistry , University of Massachusetts , Amherst , Massachusetts 01003 , United States
| | - Michael J Maroney
- Department of Chemistry , University of Massachusetts , Amherst , Massachusetts 01003 , United States
| | - Judith M Nocek
- Department of Chemistry , Northwestern University , Evanston , Illinois 60208 , United States
| | - Kirk S Schanze
- Department of Chemistry , University of Texas at San Antonio , San Antonio , Texas 78249 , United States
| | - Donald M Kurtz
- Department of Chemistry , University of Texas at San Antonio , San Antonio , Texas 78249 , United States
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18
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Chatterjee S, Basak P, Tan S, Lefort S, Pellacani D, Safneck J, Buchel E, Aparicio S, Eaves CJ, Raouf A. Abstract P5-07-04: Not presented. Cancer Res 2019. [DOI: 10.1158/1538-7445.sabcs18-p5-07-04] [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
This abstract was not presented at the conference.
Citation Format: Chatterjee S, Basak P, Tan S, Lefort S, Pellacani D, Safneck J, Buchel E, Aparicio S, Eaves CJ, Raouf A. Not presented [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 P5-07-04.
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Affiliation(s)
- S Chatterjee
- Faculty of Health Sciences, University of Manitoba, Winnipeg, MB, Canada; Research Institute of Oncology & Hematology, CancerCare Manitoba, Winnipeg, MB, Canada; Terry Fox Laboratory, British Columbia Cancer Agency, Vancouver, BC, Canada; University of British Columbia, Vancouver, BC, Canada; Section of Plastic Surgery, Faculty of Health Sciences University of Manitoba, Winnipeg, MB, Canada
| | - P Basak
- Faculty of Health Sciences, University of Manitoba, Winnipeg, MB, Canada; Research Institute of Oncology & Hematology, CancerCare Manitoba, Winnipeg, MB, Canada; Terry Fox Laboratory, British Columbia Cancer Agency, Vancouver, BC, Canada; University of British Columbia, Vancouver, BC, Canada; Section of Plastic Surgery, Faculty of Health Sciences University of Manitoba, Winnipeg, MB, Canada
| | - S Tan
- Faculty of Health Sciences, University of Manitoba, Winnipeg, MB, Canada; Research Institute of Oncology & Hematology, CancerCare Manitoba, Winnipeg, MB, Canada; Terry Fox Laboratory, British Columbia Cancer Agency, Vancouver, BC, Canada; University of British Columbia, Vancouver, BC, Canada; Section of Plastic Surgery, Faculty of Health Sciences University of Manitoba, Winnipeg, MB, Canada
| | - S Lefort
- Faculty of Health Sciences, University of Manitoba, Winnipeg, MB, Canada; Research Institute of Oncology & Hematology, CancerCare Manitoba, Winnipeg, MB, Canada; Terry Fox Laboratory, British Columbia Cancer Agency, Vancouver, BC, Canada; University of British Columbia, Vancouver, BC, Canada; Section of Plastic Surgery, Faculty of Health Sciences University of Manitoba, Winnipeg, MB, Canada
| | - D Pellacani
- Faculty of Health Sciences, University of Manitoba, Winnipeg, MB, Canada; Research Institute of Oncology & Hematology, CancerCare Manitoba, Winnipeg, MB, Canada; Terry Fox Laboratory, British Columbia Cancer Agency, Vancouver, BC, Canada; University of British Columbia, Vancouver, BC, Canada; Section of Plastic Surgery, Faculty of Health Sciences University of Manitoba, Winnipeg, MB, Canada
| | - J Safneck
- Faculty of Health Sciences, University of Manitoba, Winnipeg, MB, Canada; Research Institute of Oncology & Hematology, CancerCare Manitoba, Winnipeg, MB, Canada; Terry Fox Laboratory, British Columbia Cancer Agency, Vancouver, BC, Canada; University of British Columbia, Vancouver, BC, Canada; Section of Plastic Surgery, Faculty of Health Sciences University of Manitoba, Winnipeg, MB, Canada
| | - E Buchel
- Faculty of Health Sciences, University of Manitoba, Winnipeg, MB, Canada; Research Institute of Oncology & Hematology, CancerCare Manitoba, Winnipeg, MB, Canada; Terry Fox Laboratory, British Columbia Cancer Agency, Vancouver, BC, Canada; University of British Columbia, Vancouver, BC, Canada; Section of Plastic Surgery, Faculty of Health Sciences University of Manitoba, Winnipeg, MB, Canada
| | - S Aparicio
- Faculty of Health Sciences, University of Manitoba, Winnipeg, MB, Canada; Research Institute of Oncology & Hematology, CancerCare Manitoba, Winnipeg, MB, Canada; Terry Fox Laboratory, British Columbia Cancer Agency, Vancouver, BC, Canada; University of British Columbia, Vancouver, BC, Canada; Section of Plastic Surgery, Faculty of Health Sciences University of Manitoba, Winnipeg, MB, Canada
| | - CJ Eaves
- Faculty of Health Sciences, University of Manitoba, Winnipeg, MB, Canada; Research Institute of Oncology & Hematology, CancerCare Manitoba, Winnipeg, MB, Canada; Terry Fox Laboratory, British Columbia Cancer Agency, Vancouver, BC, Canada; University of British Columbia, Vancouver, BC, Canada; Section of Plastic Surgery, Faculty of Health Sciences University of Manitoba, Winnipeg, MB, Canada
| | - A Raouf
- Faculty of Health Sciences, University of Manitoba, Winnipeg, MB, Canada; Research Institute of Oncology & Hematology, CancerCare Manitoba, Winnipeg, MB, Canada; Terry Fox Laboratory, British Columbia Cancer Agency, Vancouver, BC, Canada; University of British Columbia, Vancouver, BC, Canada; Section of Plastic Surgery, Faculty of Health Sciences University of Manitoba, Winnipeg, MB, Canada
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Spronk CAEM, Żerko S, Górka M, Koźmiński W, Bardiaux B, Zambelli B, Musiani F, Piccioli M, Basak P, Blum FC, Johnson RC, Hu H, Merrell DS, Maroney M, Ciurli S. Structure and dynamics of Helicobacter pylori nickel-chaperone HypA: an integrated approach using NMR spectroscopy, functional assays and computational tools. J Biol Inorg Chem 2018; 23:1309-1330. [PMID: 30264175 DOI: 10.1007/s00775-018-1616-y] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2018] [Accepted: 09/05/2018] [Indexed: 01/03/2023]
Abstract
Helicobacter pylori HypA (HpHypA) is a metallochaperone necessary for maturation of [Ni,Fe]-hydrogenase and urease, the enzymes required for colonization and survival of H. pylori in the gastric mucosa. HpHypA contains a structural Zn(II) site and a unique Ni(II) binding site at the N-terminus. X-ray absorption spectra suggested that the Zn(II) coordination depends on pH and on the presence of Ni(II). This study was performed to investigate the structural properties of HpHypA as a function of pH and Ni(II) binding, using NMR spectroscopy combined with DFT and molecular dynamics calculations. The solution structure of apo,Zn-HpHypA, containing Zn(II) but devoid of Ni(II), was determined using 2D, 3D and 4D NMR spectroscopy. The structure suggests that a Ni-binding and a Zn-binding domain, joined through a short linker, could undergo mutual reorientation. This flexibility has no physiological effect on acid viability or urease maturation in H. pylori. Atomistic molecular dynamics simulations suggest that Ni(II) binding is important for the conformational stability of the N-terminal helix. NMR chemical shift perturbation analysis indicates that no structural changes occur in the Zn-binding domain upon addition of Ni(II) in the pH 6.3-7.2 range. The structure of the Ni(II) binding site was probed using 1H NMR spectroscopy experiments tailored to reveal hyperfine-shifted signals around the paramagnetic metal ion. On this basis, two possible models were derived using quantum-mechanical DFT calculations. The results provide a comprehensive picture of the Ni(II) mode to HpHypA, important to rationalize, at the molecular level, the functional interactions of this chaperone with its protein partners.
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Affiliation(s)
- Chris A E M Spronk
- JSC Spronk, Vilnius, Lithuania.,Department of Molecular and Cell Biology, Leicester Institute of Structural and Chemical Biology, University of Leicester, Leicester, UK
| | - Szymon Żerko
- Faculty of Chemistry, Biological and Chemical Research Centre, University of Warsaw, Żwirki i Wigury 101, 02-089, Warsaw, Poland
| | - Michał Górka
- Faculty of Chemistry, Biological and Chemical Research Centre, University of Warsaw, Żwirki i Wigury 101, 02-089, Warsaw, Poland.,Faculty of Physics, Division of Biophysics, Institute of Experimental Physics, University of Warsaw, Pasteura 5, 02-093, Warsaw, Poland
| | - Wiktor Koźmiński
- Faculty of Chemistry, Biological and Chemical Research Centre, University of Warsaw, Żwirki i Wigury 101, 02-089, Warsaw, Poland
| | - Benjamin Bardiaux
- Structural Bioinformatics Unit, Department of Structural Biology and Chemistry, Institut Pasteur, CNRS UMR3528, Paris, France
| | - Barbara Zambelli
- Laboratory of Bioinorganic Chemistry, Department of Pharmacy and Biotechnology, University of Bologna, Viale G. Fanin 40, 40127, Bologna, Italy
| | - Francesco Musiani
- Laboratory of Bioinorganic Chemistry, Department of Pharmacy and Biotechnology, University of Bologna, Viale G. Fanin 40, 40127, Bologna, Italy
| | - Mario Piccioli
- Center for Magnetic Resonance, Department of Chemistry, University of Florence, Florence, Italy
| | - Priyanka Basak
- Department of Chemistry, University of Massachusetts, Amherst, MA, 01003, USA
| | - Faith C Blum
- Department of Microbiology and Immunology, Uniformed Services University of the Health Sciences, Bethesda, MD, 20814, USA
| | - Ryan C Johnson
- Department of Microbiology and Immunology, Uniformed Services University of the Health Sciences, Bethesda, MD, 20814, USA
| | - Heidi Hu
- Department of Chemistry, University of Massachusetts, Amherst, MA, 01003, USA
| | - D Scott Merrell
- Department of Microbiology and Immunology, Uniformed Services University of the Health Sciences, Bethesda, MD, 20814, USA
| | - Michael Maroney
- Department of Chemistry, University of Massachusetts, Amherst, MA, 01003, USA.
| | - Stefano Ciurli
- Laboratory of Bioinorganic Chemistry, Department of Pharmacy and Biotechnology, University of Bologna, Viale G. Fanin 40, 40127, Bologna, Italy. .,Center for Magnetic Resonance, Department of Chemistry, University of Florence, Florence, Italy.
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Sarkar P, Basak P, Ghosh S, Kundu M, Sil PC. Prophylactic role of taurine and its derivatives against diabetes mellitus and its related complications. Food Chem Toxicol 2017; 110:109-121. [PMID: 29050977 DOI: 10.1016/j.fct.2017.10.022] [Citation(s) in RCA: 44] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2017] [Revised: 10/11/2017] [Accepted: 10/13/2017] [Indexed: 02/08/2023]
Abstract
Taurine is a conditionally essential amino acid present in the body in free form. Mammalian taurine is synthesized in the pancreas via the cysteine sulfinic acid pathway. Anti-oxidation and anti-inflammation are two main properties through which it exerts its therapeutic effects. Many studies have shown its excellent therapeutic potential against diabetes mellitus and related complications like diabetic neuropathy, retinopathy, nephropathy, hematological dysfunctions, reproductive dysfunctions, liver and pancreas related complications etc. Not only taurine, a number of its derivatives have also been reported to be important in ameliorating diabetic complications. The present review has been aimed to describe the importance of taurine and its derivatives against diabetic metabolic syndrome and related complications.
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Affiliation(s)
- Poulami Sarkar
- Division of Molecular Medicine, Bose Institute, P-1/12, CIT Scheme VII M, Kolkata-700054, India
| | - Priyanka Basak
- Division of Molecular Medicine, Bose Institute, P-1/12, CIT Scheme VII M, Kolkata-700054, India
| | - Sumit Ghosh
- Division of Molecular Medicine, Bose Institute, P-1/12, CIT Scheme VII M, Kolkata-700054, India
| | - Mousumi Kundu
- Division of Molecular Medicine, Bose Institute, P-1/12, CIT Scheme VII M, Kolkata-700054, India
| | - Parames C Sil
- Division of Molecular Medicine, Bose Institute, P-1/12, CIT Scheme VII M, Kolkata-700054, India.
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Basak P, Chatterjee S, Bhat V, Jin H, Su A, Murphy LC, Raouf A. Abstract P3-04-25: Role of H19, a long non-coding RNA, in development of resistance to endocrine therapy in breast cancer cells. Cancer Res 2017. [DOI: 10.1158/1538-7445.sabcs16-p3-04-25] [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
Introduction:
Majority of breast cancer tumors are Estrogen receptor positive (ER+) where antiestrogen therapies (endocrine therapies) are the best therapeutic strategy to treat this type of tumors. However, eventually over 30% of patients will develop resistance to endocrine therapies resulting in disease relapse. We recently showed that the long noncoding RNA, H19, is an estrogen target gene that plays a significant role in estrogen-induced proliferation of the normal and malignant ER+ cells. We therefore hypothesize that H19 expression is also important to the proliferation of endocrine therapy resistant cells. In this study, we examined if estrogen-independent H19 expression is important to the development of endocrine therapy resistance.
Objective:
The overall objective of this project is to use therapy sensitive (MCF-7) and therapy-resistant (LCC9) breast cancer cells as model systems to examine the role of long non-coding RNA H19 in development and maintenance of resistance to endocrine therapy.
Methodology and Results:
We examined the expression of H19 in ER+ breast cancer cells (MCF7) that under the selective pressure of fulvesterant (ICI, ER down regulator) acquire resistance to ICI. We observed that while H19 expression was initially decreased as expected, its expression subsequently increased in the ICI-resistant MCF7 cells. Interestingly, H19 knockdown in MCF7 cells significantly decrease their proliferation as determined by Flowcytometry and made them more sensitive to ICI. We also examined H19 expression in the ICI-resistant LCC9 cells and found that ICI treatment increased H19 expression. Interestingly, H19 knockdown in the LCC9 cells decreased their proliferation and surprisingly made them sensitive to ICI treatment. Previous observations indicate that NOTCH4 receptor (NR4) may be involved in endocrine therapy resistance. Interestingly we found that in presence of ICI, NR4 expression is increased and that forced activation of NR4 markedly increases H19 expression in LCC9 cells.
Conclusion:
Altogether these observations suggest that H19 plays an important role in the development of endocrine therapy resistance and further our understanding of the cellular and molecular mechanisms involved in endocrine therapy resistance. These and similar studies could potentially lead to the development of new therapies to treat therapy resistant tumor cells. Further experiments would reveal if signalling pathways that regulate H19 expression independent of estrogen are useful therapies against endocrine therapy resistant tumors.
Citation Format: Basak P, Chatterjee S, Bhat V, Jin H, Su A, Murphy LC, Raouf A. Role of H19, a long non-coding RNA, in development of resistance to endocrine therapy in breast cancer cells [abstract]. In: Proceedings of the 2016 San Antonio Breast Cancer Symposium; 2016 Dec 6-10; San Antonio, TX. Philadelphia (PA): AACR; Cancer Res 2017;77(4 Suppl):Abstract nr P3-04-25.
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Affiliation(s)
- P Basak
- Research Institute of Oncology and Hematology, Winnipeg, MB, Canada; University of Manitoba, Winnipeg, MB, Canada
| | - S Chatterjee
- Research Institute of Oncology and Hematology, Winnipeg, MB, Canada; University of Manitoba, Winnipeg, MB, Canada
| | - V Bhat
- Research Institute of Oncology and Hematology, Winnipeg, MB, Canada; University of Manitoba, Winnipeg, MB, Canada
| | - H Jin
- Research Institute of Oncology and Hematology, Winnipeg, MB, Canada; University of Manitoba, Winnipeg, MB, Canada
| | - A Su
- Research Institute of Oncology and Hematology, Winnipeg, MB, Canada; University of Manitoba, Winnipeg, MB, Canada
| | - LC Murphy
- Research Institute of Oncology and Hematology, Winnipeg, MB, Canada; University of Manitoba, Winnipeg, MB, Canada
| | - A Raouf
- Research Institute of Oncology and Hematology, Winnipeg, MB, Canada; University of Manitoba, Winnipeg, MB, Canada
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Basak P, Sadhukhan P, Sarkar P, Sil PC. Perspectives of the Nrf-2 signaling pathway in cancer progression and therapy. Toxicol Rep 2017; 4:306-318. [PMID: 28959654 PMCID: PMC5615147 DOI: 10.1016/j.toxrep.2017.06.002] [Citation(s) in RCA: 99] [Impact Index Per Article: 14.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2017] [Revised: 05/18/2017] [Accepted: 06/07/2017] [Indexed: 12/12/2022] Open
Abstract
The Nuclear factor erythroid2-related factor2 (Nrf2), a master regulator of redox homoeostasis, is a key transcription factor regulating a wide array of genes for antioxidant and detoxification enzymes. It protects organs from various kinds of toxic insults. On the other hand, activation of Nrf2 is also correlated with cancer progression and chemoresistance. Downregulation of Nrf2 activity has attracted an increasing amount of attention as it may provide an alternative cancer therapy. In this review, we examine recent studies on roles of Nrf2 in several pathophysiological conditions emphasising cancer. We discuss elaborately the current knowledge on Nrf2 regulation including KEAP1-dependent and KEAP1-independent cascades. KEAP1/Nrf2 system is a master regulator of cellular response against a variety of environmental stresses. We also highlight several tightly controlled regulations of Nrf2 by numerous proteins, small molecules, toxic metals, etc. In addition, we evaluate the possible therapeutic approaches of increasing chemosensitivity via modulating Nrf2 signaling.
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Basak P, Pattanayak R, Nag S, Bhattacharyya M. pH-induced conformational isomerization of leghemoglobin from Arachis hypogea. Biochemistry Moscow 2014; 79:1255-61. [DOI: 10.1134/s0006297914110133] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Bandosz P, Aspelund T, Basak P, Bennett K, Bjorck L, Bruthans J, Guzman-Castillo M, Hughes J, Hotchkiss J, Kabir Z, Laatikainen T, Leyland A, O’Flaherty M, Palmieri L, Rosengren A, Bjork R, Vartiainen E, Zdrojewski T, Capewell S, Critchley J. OP72 EUROHEART II - comparing policies to reduce future coronary heart disease mortality in nine European countries: modelling study. Br J Soc Med 2014. [DOI: 10.1136/jech-2014-204726.74] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Ghosh MK, Basak P, Mazumdar S. Mechanism of copper incorporation in subunit II of cytochrome C oxidase from Thermus thermophilus: identification of intermediate species. Biochemistry 2013; 52:4620-35. [PMID: 23745508 DOI: 10.1021/bi400101g] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Detailed spectroscopic and kinetic studies of incorporation of copper ion in the wild type (WT) and the D111AA (AA = K, N, or E) mutants of the metal ion binding site of the soluble fragment of subunit II of cytochrome c oxidase from Thermus thermophilus (TtCuA) showed the formation of at least two distinct intermediates. The global analyses of the multiwavelength kinetic results suggested a four-step reaction scheme involving two distinct intermediates in the pathway of incorporation of copper ions into the apoprotein forming the purple dinuclear CuA. An early intermediate similar to the red copper binding proteins was detected in the WT as well as in all the mutants. The second intermediate was a green copper species in the case of WT TtCuA. Mutation of Asp111, however, formed a second intermediate that is distinctly different from that formed in the case of the WT protein, suggesting that mutants follow pathways of copper ion incorporation different from that in the WT protein. The electrostatic interaction between Asp111 and the coordinating His114 possibly plays a subtle role in the mechanism of incorporation of metal ion into the protein. The overall Kd for WT TtCuA was found to be ~8 nM, which changed with mutation of the Asp111 residue. The activation and thermodynamic parameters were also determined from the temperature- and pH-dependent multiwavelength kinetics, and the results are discussed to unravel the role of Asp111 in the mechanism of formation of the dinuclear CuA center in cytochrome c oxidase.
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Affiliation(s)
- Manas Kumar Ghosh
- Department of Chemical Sciences, Tata Institute of Fundamental Research , Colaba, Mumbai 400005, India
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Chaklader M, Das P, Pereira JA, Chatterjee S, Basak P, Law A, Banerjee T, Chauhan S, Law S. Telomerase reverse transcriptase (TERT) expression and role of vincristine sulfate in mouse model of malignancy related peritoneal ascites: an experimental metastatic condition. Exp Oncol 2011; 33:83-89. [PMID: 21716204] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
AIM To evaluate the efficacy of intraperitoneal vincristine administration into ascitic sarcoma-180 bearing mice as a model of human malignant ascites regarding various peritoneal/retroperitoneal sarcomatosis, and to evaluate the flowcytometric telomerase reverse transcriptase expression for the diagnostic and prognostic purposes. METHODS Present study included disease induction by intraperitoneal homologous ascitic sarcoma-180 transplantation followed by in vivo intraperitoneal drug administration to study mitotic index, flowcytometric cell cycle and telomerase reverse transcriptase expression pattern, erythrosin-B dye exclusion study for malignant cell viability assessment. Besides, in vitro malignant ascite culture in presence and absence of vincristine sulfate and survival study were also taken into consideration. RESULTS Intraperitoneal vincristine administration (concentration 0.5 mg/kg body weight) significantly diminished the mitotic index in diseased subjects in comparison to untreated control subjects. Treated group of animals showed increased life span and median survival time. Cell viability assessment during the course of drug administration also revealed gradual depression on cell viability over time. Flowcytometric cell cycle analysis showed a good prognostic feature of chemotherapeutic administration schedule by representing high G2/M phase blocked cells along with reduced telomerase reverse transcriptase positive cells in treated animals. CONCLUSION We conclude that long term administration of vincristine sulfate in small doses could be a good pharmacological intervention in case of malignant peritoneal ascites due to sarcomatosis as it indirectly reduced the level of telomerase reverse transcriptase expression in malignant cells by directly regulating cell cycle and simultaneously increased the life expectancy of the diseased subjects.
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Affiliation(s)
- M Chaklader
- Stem Cell Research and Application Unit, Department of Biochemistry and Medical Biotechnology, Calcutta School of Tropical Medicine, Kolkata-700073, West Bengal, India
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Shin JH, Basak P, Kerr J, Cairns E. Rechargeable Li/LiFePO4 cells using N-methyl-N-butyl pyrrolidinium bis(trifluoromethane sulfonyl)imide–LiTFSI electrolyte incorporating polymer additives. Electrochim Acta 2008. [DOI: 10.1016/j.electacta.2008.07.062] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Basak P, Nisha CK, Manorama SV, Maiti S, Jayachandran KN. Probing the association behavior of poly(ethylene glycol)-based amphiphilic comb-like polymer in NaCl solution. J Colloid Interface Sci 2003; 262:560-5. [PMID: 16256638 DOI: 10.1016/s0021-9797(03)00119-x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2002] [Accepted: 01/28/2003] [Indexed: 11/21/2022]
Abstract
The effect of salt on the associative behavior of intramolecular aggregates obtained from poly(ethylene glycol)-based amphiphilic comb-like polymers in aqueous medium at pH 6.2 has been investigated by surface tension, fluorescence probe, dynamic light-scattering, and viscometry techniques. Results reveal that the addition of salt screens the electrostatic repulsion between the charges along the polymer backbone in the aggregates and consequently (1) reduces the surface activity at the air/water interface, (2) leads to the contraction of the polymer backbone, and (3) reduces the hydrodynamic sizes of the aggregates. In contrast, the hydrophobicity of the aggregates remains unperturbed.
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Affiliation(s)
- P Basak
- Materials Science Group, Inorganic and Physical Chemistry Division, Indian Institute of Chemical Technology, CSIR, Hyderabad 500007, India
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Barbhuiya JN, Datta PK, Basak P, Banerjee PP. Pilomatrixoma. Indian J Dermatol Venereol Leprol 1996; 62:318-319. [PMID: 20948103] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Clinical and histopathological features of two cases of pilomatrixoma are reported. The tumour in each case was slow-growing, asymptomatic and at the same site. Histopathology showed classical eosinophilic ghost cell, surrounded by basophilic cells, along with areas of calcification and keratinization.
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Affiliation(s)
- J N Barbhuiya
- Department of Medicine (Dermatology Unit), Medical College, 88, College Street, Calcutta-700073, India
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Chakrabarty A, Mukherjee M, Chakrabarty AN, Dastidar SG, Basak P, Saha B. Electron microscopic characteristics of actinomycetic agents having aetiological association with human leprosy and epizootic ulcerative syndrome of fish. Indian J Exp Biol 1996; 34:810-2. [PMID: 8979491] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
The transmission electron microscopic (TEM) studies of the human leprosy derived chemoautotrophic nocardio-form (CAN) bacteria and EUS derived CAN bacteria showed presence of double contoured cell-walls consisting of an electron transparent and a dense layer. The fibrillar structures on the surface of these CAN bacterial cells also suggested their similarity to the human tissue derived Mycobacterium leprae cells. These EM studies further revealed mycelial and coccoid bodies in all these bacteria as was observed originally.
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Affiliation(s)
- A Chakrabarty
- Department of Medical Microbiology & Parasitology, Calcutta University College of Medicine, India
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Basak P, Banerjee PP. Culture of nocardioform bacilli from leprosy patients & clinical evaluation of nocardioform bacilli derived antigen. Indian J Med Res 1995; 101:150-3. [PMID: 7751044] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
Abstract
An antigen derived from cultured nocardioform bacilli was compared with Mitsuda lepromin in intradermal skin test reactions. Nocardioform bacilli were cultured in gelatin minimal medium from the tissue fluid of 85 lepromatous patients (56 M, 29 F). Of these, 65 samples showed uncontaminated growth of the organism, which were pooled for the manufacture of the test antigen. This antigen was intradermally tested in 50 untreated leprosy patients irrespective of the type, together with Mitsuda lepromin and sterile gelatin minimal media, which served as a control. No early reaction was observed at 72 h, while the late reaction at 28 days was positive in all patients in the Tuberculoid (TT) group with both antigens. Eighteen patients (81.8%) in the Borderline tuberculoid (BT) group reacted strongly to Mitsuda lepromin at 28 days, while 21 patients (95.5%) in this group showed a strong late reaction with the test antigen. The lepromatous (LL) group did not show any reaction with the two antigens. It is inferred that nocardioform bacilli are easy to cultivate, and that the test antigen compares well with Mitsuda lepromin.
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Affiliation(s)
- P Basak
- Department of Medicine, Medical College Hospital, Calcutta
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Abstract
Concurrent skin and nerve histology was evaluated in 60 leprosy patients (25 BT, 28 BL and 7 LL). The twin aims were to study the comparative histology and the usefulness of nerve histology in the classification of the disease. In BT patients, clinical and histological classification was in agreement in 11 (44%) skin and 17 (68%) nerve biopsies. Concurrent skin and nerve histology was in consonance in 14 (56%) BT patients, while in 6 (24%) patients, only nerve histology was helpful in the classification of the disease, the skin histology being non-specific. Nerve histology was classified as BL in 3 (12%) BT patients, the skin histology was non-specific. In the BL group, the histology of 23 (82.4%) nerve biopsies correlated with the clinical classification, in contrast to skin histology which correlated with clinical assessment in 19 (68%) patients only. In the LL patients, the histology of nerve correlated with the clinical classification in 5 patients (71.4%), compared to histology of the skin in 4 (57%) patients only. The GF was higher in the nerves than in the skin throughout the leprosy spectrum (BT, BL, LL); the difference was, however, marginal in BL leprosy. The average bacteriological index (BI) was higher in nerves (4+) compared to that of skin histology and slit skin smears (3+) in BL leprosy. There was, however, no difference in the BI of the slit skin smears, skin and nerve biopsies in lepromatous leprosy.(ABSTRACT TRUNCATED AT 250 WORDS)
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Affiliation(s)
- S Kaur
- Department of Dermatology, Postgraduate Institute of Medical Education and Research, Chandigarh, India
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Kaur S, Sharma VK, Basak P, Kaur I. Paucibacillary multidrug therapy in leprosy. 7 1/2 years experience. Indian J Lepr 1992; 64:153-61. [PMID: 1607713] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Three hundred and twenty-three paucibacillary (PB) leprosy patients were treated with WHO-recommended multidrug therapy (MDT) and followed up for over 7 1/2 years. The paucibacillary MDT regimen (PBR) was well accepted and tolerated. Complete clinical regression was attained in 61.2% patients after 6 doses of PBR. Persistence of clinical activity after 6 months of therapy was associated with occurrence of type I upgrading reaction, presence of six or more patches and more than two thickened major nerve trunks. Reversal reactions were encountered in 15.9% patients, one third of which were accompanied by severe neuritis. Delayed upgrading reaction occurred in six patients, two patients had relapse one and two years after stopping of PBR. The WHO recommended MDT regimen for paucibacillary cases needs careful evaluation and it may be necessary to extend the treatment beyond six months in certain situations.
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Affiliation(s)
- S Kaur
- Department of Dermatology, Postgraduate Institute of Medical Education and Research, Chandigarh
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Basak P, Datta A. CP violation in the Z4 model with four generations. Phys Rev D Part Fields 1991; 44:865-870. [PMID: 10013940 DOI: 10.1103/physrevd.44.865] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Basak P, Kanwar AJ, Mistri G. Drug rash in a hemiplegic. Arch Dermatol 1990; 126:688-9. [PMID: 2334198] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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Basak P, Kanwar AJ, Kaur S, Dhar S. Faun-tail nevus--a case report. Indian J Dermatol 1989; 34:66-8. [PMID: 2632380] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
A Case of faun-tail nevus is presented. A long tuft of hair over the back in the lumbar region hid a bony defect of the fifth lumbar spine. No neurological symptoms were encountered.
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Basak P, Dhar S, Kanwar AJ. Involvement of the legs in idiopathic striae distensae--a case report. Indian J Dermatol 1989; 34:21-2. [PMID: 2625361] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
A case of idiopathic striae distensae (ISD) is presented. The patient was a healthy young adult with no history of weight lifting, use of systemic or local corticosteroids, infections or trauma. Horizontally disposed striae were located on the abdomen, back and legs. To the best of our knowledge this is the first report case of ISD where idiopathic striae were present below the knees.
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