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Reja A, Pal S, Mahato K, Saha B, Delle Piane M, Pavan GM, Das D. Emergence of Photomodulated Protometabolism by Short Peptide-Based Assemblies. J Am Chem Soc 2023; 145:21114-21121. [PMID: 37708200 DOI: 10.1021/jacs.3c08158] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/16/2023]
Abstract
In the early Earth, rudimentary enzymes must have utilized the available light energy source to modulate protometabolic processes. Herein, we report the light-responsive C-C bond manipulation via short peptide-based assemblies bound to the photosensitive molecular cofactor (azo-based photoswitch) where the energy of the light source regulated the binding sites which subsequently modulated the retro-aldolase activity. In the presence of a continual source of high-energy photons, temporal realization of a catalytically more proficient state could be achieved under nonequilibrium conditions. Further, the hydrophobic surface of peptide assemblies facilitated the binding of an orthogonal molecular catalyst that showed augmented activity (promiscuous hydrolytic activity) upon binding. This latent activity was utilized for the in situ generation of light-sensitive cofactor that subsequently modulated the retro-aldolase activity, thus creating a reaction network.
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Affiliation(s)
- Antara Reja
- Department of Chemical Sciences and CAFM, Indian Institute of Science Education and Research (IISER) Kolkata, Mohanpur 741246, India
| | - Sumit Pal
- Department of Chemical Sciences and CAFM, Indian Institute of Science Education and Research (IISER) Kolkata, Mohanpur 741246, India
| | - Kishalay Mahato
- Department of Chemical Sciences and CAFM, Indian Institute of Science Education and Research (IISER) Kolkata, Mohanpur 741246, India
| | - Baishakhi Saha
- Department of Chemical Sciences and CAFM, Indian Institute of Science Education and Research (IISER) Kolkata, Mohanpur 741246, India
| | - Massimo Delle Piane
- Department of Applied Science and Technology, Politecnico di Torino, Corso Duca Degli Abruzzi 24, 10129 Torino, Italy
| | - Giovanni M Pavan
- Department of Applied Science and Technology, Politecnico di Torino, Corso Duca Degli Abruzzi 24, 10129 Torino, Italy
- Department of Innovative Technologies, University of Applied Sciences and Arts of Southern Switzerland, Polo Universitario Lugano, Campus Est, Via la Santa 1, 6962 Lugano-Viganello, Switzerland
| | - Dibyendu Das
- Department of Chemical Sciences and CAFM, Indian Institute of Science Education and Research (IISER) Kolkata, Mohanpur 741246, India
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Kumar Mahato A, Pal S, Dey K, Reja A, Paul S, Shelke A, Ajithkumar TG, Das D, Banerjee R. Covalent Organic Framework Cladding on Peptide-Amphiphile-Based Biomimetic Catalysts. J Am Chem Soc 2023. [PMID: 37267597 DOI: 10.1021/jacs.3c03562] [Citation(s) in RCA: 8] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Peptide-based biomimetic catalysts are promising materials for efficient catalytic activity in various biochemical transformations. However, their lack of operational stability and fragile nature in non-aqueous media limit their practical applications. In this study, we have developed a cladding technique to stabilize biomimetic catalysts within porous covalent organic framework (COF) scaffolds. This methodology allows for the homogeneous distribution of peptide nanotubes inside the COF (TpAzo and TpDPP) backbone, creating strong noncovalent interactions that prevent leaching. We synthesized two different peptide-amphiphiles, C10FFVK and C10FFVR, with lysine (K) and arginine (R) at the C-termini, respectively, which formed nanotubular morphologies. The C10FFVK peptide-amphiphile nanotubes exhibit enzyme-like behavior and efficiently catalyze C-C bond cleavage in a buffer medium (pH 7.5). We produced nanotubular structures of TpAzo-C10FFVK and TpDPP-C10FFVK through COF cladding by using interfacial crystallization (IC). The peptide nanotubes encased in the COF catalyze C-C bond cleavage in a buffer medium as well as in different organic solvents (such as acetonitrile, acetone, and dichloromethane). The TpAzo-C10FFVK catalyst, being heterogeneous, is easily recoverable, enabling the reaction to be performed for multiple cycles. Additionally, the synthesis of TpAzo-C10FFVK thin films facilitates catalysis in flow. As control, we synthesized another peptide-amphiphile, C10FFVR, which also forms tubular assemblies. By depositing TpAzo COF crystallites on C10FFVR nanotubes through IC, we produced TpAzo-C10FFVR nanotubular structures that expectedly did not show catalysis, suggesting the critical role of the lysines in the TpAzo-C10FFVK.
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Affiliation(s)
- Ashok Kumar Mahato
- Department of Chemical Sciences, Indian Institute of Science Education and Research, Kolkata, Mohanpur 741246, India
- Centre for Advanced Functional Materials, Indian Institute of Science Education and Research, Kolkata, Mohanpur 741246, India
| | - Sumit Pal
- Department of Chemical Sciences, Indian Institute of Science Education and Research, Kolkata, Mohanpur 741246, India
- Centre for Advanced Functional Materials, Indian Institute of Science Education and Research, Kolkata, Mohanpur 741246, India
| | - Kaushik Dey
- Department of Chemical Sciences, Indian Institute of Science Education and Research, Kolkata, Mohanpur 741246, India
- Centre for Advanced Functional Materials, Indian Institute of Science Education and Research, Kolkata, Mohanpur 741246, India
| | - Antara Reja
- Department of Chemical Sciences, Indian Institute of Science Education and Research, Kolkata, Mohanpur 741246, India
- Centre for Advanced Functional Materials, Indian Institute of Science Education and Research, Kolkata, Mohanpur 741246, India
| | - Satyadip Paul
- Department of Chemical Sciences, Indian Institute of Science Education and Research, Kolkata, Mohanpur 741246, India
- Centre for Advanced Functional Materials, Indian Institute of Science Education and Research, Kolkata, Mohanpur 741246, India
| | - Ankita Shelke
- Central NMR Facility and Physical/Materials Chemistry Division, CSIR-National Chemical Laboratory, Pune 411008, India
| | - Thalasseril G Ajithkumar
- Central NMR Facility and Physical/Materials Chemistry Division, CSIR-National Chemical Laboratory, Pune 411008, India
| | - Dibyendu Das
- Department of Chemical Sciences, Indian Institute of Science Education and Research, Kolkata, Mohanpur 741246, India
- Centre for Advanced Functional Materials, Indian Institute of Science Education and Research, Kolkata, Mohanpur 741246, India
| | - Rahul Banerjee
- Department of Chemical Sciences, Indian Institute of Science Education and Research, Kolkata, Mohanpur 741246, India
- Centre for Advanced Functional Materials, Indian Institute of Science Education and Research, Kolkata, Mohanpur 741246, India
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Goswami S, Reja A, Pal S, Singh A, Das D. Nonequilibrium Amyloid Polymers Exploit Dynamic Covalent Linkage to Temporally Control Charge-Selective Catalysis. J Am Chem Soc 2022; 144:19248-19252. [PMID: 36219699 DOI: 10.1021/jacs.2c09262] [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: 11/29/2022]
Abstract
Extant proteins exploit thermodynamically activated negatively charged coenzymes and hydrotropes to temporally access mechanistically important conformations that regulate vital biological functions, from metabolic reactions to expression modulation. Herein, we show that a short amyloid peptide can bind to a small molecular coenzyme by exploiting reversible covalent linkage to polymerize and access catalytically proficient nonequilibrium amyloid microphases. Subsequent hydrolysis of the activated coenzyme leads to depolymerization, realizing a variance of the surface charge of the assembly as a function of time. Such temporal change of surface charge dynamically modulates catalytic activities of the transient assemblies as observed in highly evolved modern-day biocatalysts.
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Affiliation(s)
- Surashree Goswami
- Department of Chemical Sciences and Centre for Advanced Functional Materials, Indian Institute of Science Education and Research (IISER) Kolkata, Mohanpur 741246, West Bengal, India
| | - Antara Reja
- Department of Chemical Sciences and Centre for Advanced Functional Materials, Indian Institute of Science Education and Research (IISER) Kolkata, Mohanpur 741246, West Bengal, India
| | - Sumit Pal
- Department of Chemical Sciences and Centre for Advanced Functional Materials, Indian Institute of Science Education and Research (IISER) Kolkata, Mohanpur 741246, West Bengal, India
| | - Abhishek Singh
- Department of Chemical Sciences and Centre for Advanced Functional Materials, Indian Institute of Science Education and Research (IISER) Kolkata, Mohanpur 741246, West Bengal, India
| | - Dibyendu Das
- Department of Chemical Sciences and Centre for Advanced Functional Materials, Indian Institute of Science Education and Research (IISER) Kolkata, Mohanpur 741246, West Bengal, India
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Abstract
During the billions of years of the evolutionary journey, primitive polymers, involved in proto metabolic pathways with low catalytic activity, played critical roles in the emergence of modern enzymes with remarkable substrate specificity. The precise positioning of amino acid residues and the complex orchestrated interplay in the binding pockets of evolved enzymes promote covalent and non-covalent interactions to foster a diverse set of complex catalytic transformations. Recent efforts to emulate the structural and functional information of extant enzymes by minimal peptide based assemblies have attempted to provide a holistic approach that could help in discerning the prebiotic origins of catalytically active binding pockets of advanced proteins. In addition to the impressive sets of advanced biochemical transformations, catalytic promiscuity and cascade catalysis by such small molecule based dynamic systems can foreshadow the ancestral catalytic processes required for the onset of protometabolism. Looking beyond minimal systems that work close to equilibrium, catalytic systems and compartments under non-equilibrium conditions utilizing simple prebiotically relevant precursors have attempted to shed light on how bioenergetics played an essential role in chemical emergence of complex behaviour. Herein, we map out these recent works and progress where diverse sets of complex enzymatic transformations were demonstrated by utilizing minimal peptide based self-assembled systems. Further, we have attempted to cover the examples of peptide assemblies that could feature promiscuous activity and promote complex multistep cascade reaction networks. The review also covers a few recent examples of minimal transient catalytic assemblies under non-equilibrium conditions. This review attempts to provide a broad perspective for potentially programming functionality via rational selection of amino acid sequences leading towards minimal catalytic systems that resemble the traits of contemporary enzymes.
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Affiliation(s)
- Ayan Chatterjee
- Department of Chemical Sciences and Centre for Advanced Functional Materials, Indian Institute of Science Education and Research (IISER) Kolkata, Mohanpur-741246, India.
| | - Antara Reja
- Department of Chemical Sciences and Centre for Advanced Functional Materials, Indian Institute of Science Education and Research (IISER) Kolkata, Mohanpur-741246, India.
| | - Sumit Pal
- Department of Chemical Sciences and Centre for Advanced Functional Materials, Indian Institute of Science Education and Research (IISER) Kolkata, Mohanpur-741246, India.
| | - Dibyendu Das
- Department of Chemical Sciences and Centre for Advanced Functional Materials, Indian Institute of Science Education and Research (IISER) Kolkata, Mohanpur-741246, India.
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Pal S, Reja A, Bal S, Tikader B, Das D. Emergence of a Promiscuous Peroxidase Under Non‐Equilibrium Conditions**. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202111857] [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: 11/09/2022]
Affiliation(s)
- Sumit Pal
- Department of Chemical Sciences & Centre for Advanced Functional Materials Indian Institute of Science Education and Research (IISER) Kolkata Mohanpur West Bengal 741246 India
| | - Antara Reja
- Department of Chemical Sciences & Centre for Advanced Functional Materials Indian Institute of Science Education and Research (IISER) Kolkata Mohanpur West Bengal 741246 India
| | - Subhajit Bal
- Department of Chemical Sciences & Centre for Advanced Functional Materials Indian Institute of Science Education and Research (IISER) Kolkata Mohanpur West Bengal 741246 India
| | - Baishakhi Tikader
- Department of Chemistry Indian Institute of Technology Bombay Powai Mumbai 400076 India
| | - Dibyendu Das
- Department of Chemical Sciences & Centre for Advanced Functional Materials Indian Institute of Science Education and Research (IISER) Kolkata Mohanpur West Bengal 741246 India
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Abstract
Herein, we report the substrate induced generation of a transient catalytic microenvironment from a single amino acid functionalized fatty acid in presence of a cofactor hemin. The catalytic state accessed under non-equilibrium conditions showed acceleration of peroxidase activity resulting in degradation of the substrate and subsequently led to disassembly. Equilibrated systems could not access the three-dimensional microphases and showed substantially lower catalytic activity. Further, the assembled state showed latent catalytic function (promiscuity) to hydrolyze a precursor to yield the same substrate. Consequently, the assembly demonstrated protometabolism by exploiting the peroxidase-hydrolase cascade to augment the lifetime and the mechanical properties of the catalytic state.
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Affiliation(s)
- Sumit Pal
- Department of Chemical Sciences &, Centre for Advanced Functional Materials, Indian Institute of Science Education and Research (IISER) Kolkata, Mohanpur, West Bengal, 741246, India
| | - Antara Reja
- Department of Chemical Sciences &, Centre for Advanced Functional Materials, Indian Institute of Science Education and Research (IISER) Kolkata, Mohanpur, West Bengal, 741246, India
| | - Subhajit Bal
- Department of Chemical Sciences &, Centre for Advanced Functional Materials, Indian Institute of Science Education and Research (IISER) Kolkata, Mohanpur, West Bengal, 741246, India
| | - Baishakhi Tikader
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai, 400076, India
| | - Dibyendu Das
- Department of Chemical Sciences &, Centre for Advanced Functional Materials, Indian Institute of Science Education and Research (IISER) Kolkata, Mohanpur, West Bengal, 741246, India
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Affiliation(s)
- Antara Reja
- Department of Chemical Sciences & Centre for Advanced Functional MaterialsIndian Institute of Science Education and Research (IISER) Kolkata Mohanpur, West Bengal 741246 India
| | - Syed Pavel Afrose
- Department of Chemical Sciences & Centre for Advanced Functional MaterialsIndian Institute of Science Education and Research (IISER) Kolkata Mohanpur, West Bengal 741246 India
| | - Dibyendu Das
- Department of Chemical Sciences & Centre for Advanced Functional MaterialsIndian Institute of Science Education and Research (IISER) Kolkata Mohanpur, West Bengal 741246 India
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Reja A, Afrose SP, Das D. Aldolase Cascade Facilitated by Self-Assembled Nanotubes from Short Peptide Amphiphiles. Angew Chem Int Ed Engl 2020; 59:4329-4334. [PMID: 31920004 DOI: 10.1002/anie.201914633] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [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: 11/15/2019] [Revised: 12/17/2019] [Indexed: 12/25/2022]
Abstract
Early evolution benefited from a complex network of reactions involving multiple C-C bond forming and breaking events that were critical for primitive metabolism. Nature gradually chose highly evolved and complex enzymes such as lyases to efficiently facilitate C-C bond formation and cleavage with remarkable substrate selectivity. Reported here is a lipidated short peptide which accesses a homogenous nanotubular morphology to efficiently catalyze C-C bond cleavage and formation. This system shows morphology-dependent catalytic rates, suggesting the formation of a binding pocket and registered enhancements in the presence of the hydrogen-bond donor tyrosine, which is exploited by extant aldolases. These assemblies showed excellent substrate selectivity and templated the formation of a specific adduct from a pool of possible adducts. The ability to catalyze metabolically relevant cascade transformations suggests the importance of such systems in early evolution.
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Affiliation(s)
- Antara Reja
- Department of Chemical Sciences & Centre for Advanced Functional Materials, Indian Institute of Science Education and Research (IISER) Kolkata, Mohanpur, West Bengal, 741246, India
| | - Syed Pavel Afrose
- Department of Chemical Sciences & Centre for Advanced Functional Materials, Indian Institute of Science Education and Research (IISER) Kolkata, Mohanpur, West Bengal, 741246, India
| | - Dibyendu Das
- Department of Chemical Sciences & Centre for Advanced Functional Materials, Indian Institute of Science Education and Research (IISER) Kolkata, Mohanpur, West Bengal, 741246, India
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Saha B, Chatterjee A, Reja A, Das D. Condensates of short peptides and ATP for the temporal regulation of cytochrome c activity. Chem Commun (Camb) 2019; 55:14194-14197. [PMID: 31702760 DOI: 10.1039/c9cc07358b] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Herein, we report the generation of simple condensates of short peptides with ATP, which are spatiotemporally formed under dissipative conditions created in presence of ATP-ase. These coacervates could imbibe cytochrome c and temporally modulate a redox reaction catalyzed by the entrapped protein, thus mimicking the advanced functional machinery of transient intercellular membraneless condensates of large proteins and RNA.
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Affiliation(s)
- Baishakhi Saha
- Department of Chemical Sciences and Centre for Advanced Functional Materials, Indian Institute of Science Education and Research (IISER) Kolkata, Mohanpur-741246, India.
| | - Ayan Chatterjee
- Department of Chemical Sciences and Centre for Advanced Functional Materials, Indian Institute of Science Education and Research (IISER) Kolkata, Mohanpur-741246, India.
| | - Antara Reja
- Department of Chemical Sciences and Centre for Advanced Functional Materials, Indian Institute of Science Education and Research (IISER) Kolkata, Mohanpur-741246, India.
| | - Dibyendu Das
- Department of Chemical Sciences and Centre for Advanced Functional Materials, Indian Institute of Science Education and Research (IISER) Kolkata, Mohanpur-741246, India.
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Reja A, Biswas A, Yadav J, Dev D, Das AK. Induction of Supramolecular Helical Handedness in a Chemical Reaction Directed Self-Healable Soft Material. ChemistrySelect 2017. [DOI: 10.1002/slct.201702212] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Affiliation(s)
- Antara Reja
- Department of Chemistry; Indian Institute of Technology Indore; Khandwa Road Indore 453552 India
| | - Ankan Biswas
- Department of Chemistry; Indian Institute of Technology Indore; Khandwa Road Indore 453552 India
| | - Jonu Yadav
- Department of Chemistry; Indian Institute of Technology Indore; Khandwa Road Indore 453552 India
| | - Dharm Dev
- Department of Chemistry; Indian Institute of Technology Indore; Khandwa Road Indore 453552 India
| | - Apurba K. Das
- Department of Chemistry; Indian Institute of Technology Indore; Khandwa Road Indore 453552 India
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Gill GV, Tekle A, Reja A, Wile D, English PJ, Diver M, Williams AJK, Tesfaye S. Immunological and C-peptide studies of patients with diabetes in northern Ethiopia: existence of an unusual subgroup possibly related to malnutrition. Diabetologia 2011; 54:51-7. [PMID: 20890591 DOI: 10.1007/s00125-010-1921-7] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/23/2010] [Accepted: 08/20/2010] [Indexed: 10/19/2022]
Abstract
AIMS/HYPOTHESIS Surveys in northern Ethiopia have demonstrated that apparent type 1 diabetes occurs more frequently than elsewhere in Africa and, indeed, in other parts of the world. We therefore investigated in detail a cohort of diabetic patients from this region to clarify the nature of this type of diabetes. METHODS All patients attending the diabetic clinic at Mekelle Hospital in the Tigray region of northern Ethiopia were investigated over a 6 week period. Clinical, demographic and anthropometric data were collected, as well as measurements of HbA(1c), fasting lipid profile, fasting serum C-peptide and serum markers of beta cell autoimmunity, i.e. islet antigen-2 and GAD antibodies (GADA). RESULTS Of 105 patients seen, 69 (66%) were on insulin treatment and had been from or close to diagnosis. Their median age and diabetes duration were 30 and 5 years, respectively, with a male excess of 2:1. Median BMI was 20.6 kg/m². Despite these clinical characteristics suggestive of type 1 diabetes, only 42 of 69 (61%) patients were C-peptide-negative and 35% GADA-positive. Overall, 38 (36%) of the total group (n = 105) had immunological or C-peptide characteristics inconsistent with typical type 1 or type 2 diabetes. The clinical characteristics, local prevalence of undernutrition, and GADA and C-peptide heterogeneity suggest a malnutrition-related form of diabetes. CONCLUSIONS/INTERPRETATION Not all patients in northern Ethiopia with apparent type 1 diabetes appear to have the form of disease seen in Europids; their disease may, in fact, be related to malnutrition.
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Affiliation(s)
- G V Gill
- Department of Tropical Medicine, Liverpool School of Tropical Medicine, UK.
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Abdulkadir J, Reja A. Management of diabetes mellitus: coping with limited facilities. Ethiop Med J 2001; 39:349-65. [PMID: 12380234] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/26/2023]
Affiliation(s)
- J Abdulkadir
- Faculty of Medicine, Addis Ababa University, PO Box 2380, Addis Ababa, Ethiopia
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Santiago D, Motas-Guzmán M, Reja A, María-Mojica P, Rodero B, García-Fernández AJ. Lead and cadmium in red deer and wild boar from Sierra Morena Mountains (Andalusia, Spain). Bull Environ Contam Toxicol 1998; 61:730-737. [PMID: 9871001 DOI: 10.1007/s001289900822] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Affiliation(s)
- D Santiago
- Department of Toxicology, School of Veterinary Medicine, University of Murcia, 30071, Murcia, Spain
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Moreno L, Serrano JM, Reja A, Guimera E, Escudero E. Pharmacokinetics of oxytetracycline after intravenous administration at two dose levels to hens. J Vet Pharmacol Ther 1996; 19:495-7. [PMID: 8971681 DOI: 10.1111/j.1365-2885.1996.tb00089.x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Affiliation(s)
- L Moreno
- Dpto Farmacolgía y Toxicología, Facultad de Veterinaria, Universidad de Córdoba, Spain
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Reja A, Moreno L, Serrano JM, Santiago D, Soler F. Concentration-time profiles of oxytetracycline in blood, kidney and liver of tench (Tinca tinca L) after intramuscular administration. Vet Hum Toxicol 1996; 38:344-347. [PMID: 8888537] [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: 05/22/2023]
Abstract
Oxytetracycline (OTC) is a widely-used antibiotic in several animal species. The Food and Drug Administration allows OTC to be used in fish intended for human food, but there is limited kinetics data available. We studied OTC concentrations in plasma, kidney and liver in tenches (Tinca tinca L) after im administration using HPLC. Concentrations were fit to a monocompartment open model by extended least squares regression analysis using the MULTI (ELS) computer program. Peaks of OTC concentrations (Cmax) occurred at 4 h for blood and kidney and 72 h for liver and were 134.1 micrograms/mL, 129.8 micrograms/g and 333.4 micrograms/g, respectively. There was a high correlation (r = 0.9448) between blood and kidney concentrations and less between blood and liver. Concentrations were statistically different for each system. The blood OTC concentrations were higher than renal concentrations 92% of the time and were higher than hepatic concentrations 29% of the time. The plasma OTC half-life (21.2 h) was longer than in homeothermic species. The tench liver maintains considerable OTC residues and may affect food products derived from that organ.
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Affiliation(s)
- A Reja
- Universidad de Cordoba, Dpto de Farmacologia Y Toxicologia, Spain
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Santiago D, Cano M, Reja A, Sánchez-Garcia A, Garcia-Fernández A. Lead, cadmium and copper contamination in wild animal in sierra morena, andalucia (Spain). Toxicol Lett 1995. [DOI: 10.1016/0378-4274(95)94924-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Reja A, Santiago D, Sarrano J, Moreno L, Solar F. Oxytetracycline residue formation in tench (Tinca tinca, L.) muscle after experimental administration. Toxicol Lett 1995. [DOI: 10.1016/0378-4274(95)94912-z] [Citation(s) in RCA: 2] [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: 10/17/2022]
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Abstract
Thirteen diabetic patients with hypertension (mean diastolic blood pressure 96.2 +/- 1.1 mmHg) were included in a study to assess the effects of lisinopril (20 mg day-1) on measures of nerve function. Patients had nerve conduction velocity (NCV), temperature discrimination threshold (TDT), and vibration perception threshold (VPT) measurements. At the end of 12 weeks of treatment with lisinopril, there was a significant improvement in median motor NCV (mean change +/- SEM 2.7 +/- 0.6 m s-1, p < 0.0001), median sensory NCV (2.1 +/- 0.9 m s-1, p = 0.03), peroneal motor NCV (1.0 +/- 0.4 m s-1, p = 0.03), and sural sensory NCV (1.9 +/- 0.7 m s-1, p = 0.01) values. There were also significant improvements in warm TDT and VPT. Diastolic BP decreased significantly, but there was no significant change in HbA1. Double blind controlled studies are now needed to confirm the effect of lisinopril on measures of nerve function.
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Affiliation(s)
- A Reja
- Diabetes Research Unit, Royal Hallamshire Hospital, Sheffield, UK
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