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Lin M, Eubanks LM, Karadkhelkar NM, Blake S, Janda KD. Catalytic Antibody Blunts Carfentanil-Induced Respiratory Depression. ACS Pharmacol Transl Sci 2023; 6:802-811. [PMID: 37200811 PMCID: PMC10186356 DOI: 10.1021/acsptsci.3c00031] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [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: 02/14/2023] [Indexed: 05/20/2023]
Abstract
Carfentanil, the most potent of the fentanyl analogues, is at the forefront of synthetic opioid-related deaths, second to fentanyl. Moreover, the administration of the opioid receptor antagonist naloxone has proven inadequate for an increasing number of opioid-related conditions, often requiring higher/additional doses to be effective, as such interest in alternative strategies to combat more potent synthetic opioids has intensified. Increasing drug metabolism would be one strategy to detoxify carfentanil; however, carfentanil's major metabolic pathways involve N-dealkylation or monohydroxylation, which do not lend themselves readily to exogenous enzyme addition. Herein, we report, to our knowledge, the first demonstration that carfentanil's methyl ester when hydrolyzed to its acid was found to be 40,000 times less potent than carfentanil in activating the μ-opioid receptor. Physiological consequences of carfentanil and its acid were also examined through plethysmography, and carfentanil's acid was found to be incapable of inducing respiratory depression. Based upon this information, a hapten was chemically synthesized and immunized, allowing the generation of antibodies that were screened for carfentanil ester hydrolysis. From the screening campaign, three antibodies were found to accelerate the hydrolysis of carfentanil's methyl ester. From this series of catalytic antibodies, the most active underwent extensive kinetic analysis, allowing us to postulate its mechanism of hydrolysis against this synthetic opioid. In the context of potential clinical applications, the antibody, when passively administered, was able to reduce respiratory depression induced by carfentanil. The data presented supports further development of antibody catalysis as a biologic strategy to complement carfentanil overdose reversal.
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Affiliation(s)
- Mingliang Lin
- Departments of Chemistry
and Immunology, The Skaggs Institute for Chemical Biology, Worm Institute
of Research and Medicine (WIRM), The Scripps
Research Institute, La Jolla, California 92037, United States
| | - Lisa M. Eubanks
- Departments of Chemistry
and Immunology, The Skaggs Institute for Chemical Biology, Worm Institute
of Research and Medicine (WIRM), The Scripps
Research Institute, La Jolla, California 92037, United States
| | - Nishant M. Karadkhelkar
- Departments of Chemistry
and Immunology, The Skaggs Institute for Chemical Biology, Worm Institute
of Research and Medicine (WIRM), The Scripps
Research Institute, La Jolla, California 92037, United States
| | - Steven Blake
- Departments of Chemistry
and Immunology, The Skaggs Institute for Chemical Biology, Worm Institute
of Research and Medicine (WIRM), The Scripps
Research Institute, La Jolla, California 92037, United States
| | - Kim D. Janda
- Departments of Chemistry
and Immunology, The Skaggs Institute for Chemical Biology, Worm Institute
of Research and Medicine (WIRM), The Scripps
Research Institute, La Jolla, California 92037, United States
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2
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Warford L, Mason C, Lonsdale J, Bersuder P, Blake S, Evans N, Thomas B, James D. A reassessment of TBT action levels for determining the fate of dredged sediments in the United Kingdom. Mar Pollut Bull 2022; 176:113439. [PMID: 35183026 DOI: 10.1016/j.marpolbul.2022.113439] [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] [Subscribe] [Scholar Register] [Received: 10/08/2021] [Revised: 02/04/2022] [Accepted: 02/05/2022] [Indexed: 06/14/2023]
Abstract
As part of reviewing the United Kingdom (UK) action levels (ALs) of contaminants for managing the disposal of dredged marine sediment material, tributyl tin (TBT) has been reassessed. TBT is a banned biocide capable of causing severe harm to the marine environment. Its presence is routinely screened for prior to marine disposal of dredged sediment material. Dredged sediment TBT concentrations have been studied using UK monitoring data obtained between 2000 and 2018. The changes in these TBT concentrations have guided the reassessment of ALs. Recent toxicity studies have also guided the reassessment of TBT ALs. This study, which itself forms part of a larger review by the Department for Environment, Food and Rural Affairs, has concluded that current UK TBT ALs may no longer be fit for purpose. A more environmentally protective approach for controlling release of TBT into the marine environment is recommended.
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Affiliation(s)
- L Warford
- Cefas, Lowestoft, Suffolk NR33 0HT, UK.
| | - C Mason
- Cefas, Lowestoft, Suffolk NR33 0HT, UK
| | | | | | - S Blake
- Cefas, Lowestoft, Suffolk NR33 0HT, UK
| | - N Evans
- Nottingham Trent University, Nottingham NG11 8NS, UK
| | - B Thomas
- Cefas, Lowestoft, Suffolk NR33 0HT, UK
| | - D James
- Cefas, Lowestoft, Suffolk NR33 0HT, UK
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3
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Blake S, Shaabani N, Eubanks LM, Maruyama J, Manning JT, Beutler N, Paessler S, Ji H, Teijaro JR, Janda KD. Salicylanilides Reduce SARS-CoV-2 Replication and Suppress Induction of Inflammatory Cytokines in a Rodent Model. ACS Infect Dis 2021; 7:2229-2237. [PMID: 34339171 PMCID: PMC8353890 DOI: 10.1021/acsinfecdis.1c00253] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2021] [Indexed: 12/27/2022]
Abstract
SARS-CoV-2 virus has recently given rise to the current COVID-19 pandemic where infected individuals can range from being asymptomatic, yet highly contagious, to dying from acute respiratory distress syndrome. Although the world has mobilized to create antiviral vaccines and therapeutics to combat the scourge, their long-term efficacy remains in question especially with the emergence of new variants. In this work, we exploit a class of compounds that has previously shown success against various viruses. A salicylanilide library was first screened in a SARS-CoV-2 activity assay in Vero cells. The most efficacious derivative was further evaluated in a prophylactic mouse model of SARS-CoV-2 infection unveiling a salicylanilide that can reduce viral loads, modulate key cytokines, and mitigate severe weight loss involved in COVID-19 infections. The combination of anti-SARS-CoV-2 activity, cytokine inhibitory activity, and a previously established favorable pharmacokinetic profile for the lead salicylanilide renders salicylanilides in general as promising therapeutics for COVID-19.
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Affiliation(s)
- Steven Blake
- Departments
of Chemistry and Immunology, The Skaggs Institute for Chemical Biology,
Worm Institute of Research and Medicine (WIRM), The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, United States
| | - Namir Shaabani
- Department
of Immunology and Microbiology, The Scripps
Research Institute, 10550
North Torrey Pines Road, La Jolla, California 92037, United States
| | - Lisa M. Eubanks
- Departments
of Chemistry and Immunology, The Skaggs Institute for Chemical Biology,
Worm Institute of Research and Medicine (WIRM), The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, United States
| | - Junki Maruyama
- Department
of Pathology, University of Texas Medical
Branch, 301 University Boulevard, Galveston, Texas 77555, United States
| | - John T. Manning
- Department
of Pathology, University of Texas Medical
Branch, 301 University Boulevard, Galveston, Texas 77555, United States
| | - Nathan Beutler
- Department
of Immunology and Microbiology, The Scripps
Research Institute, 10550
North Torrey Pines Road, La Jolla, California 92037, United States
| | - Slobodan Paessler
- Department
of Pathology, University of Texas Medical
Branch, 301 University Boulevard, Galveston, Texas 77555, United States
| | - Henry Ji
- Sorrento
Therapeutics Inc., 4955 Directors Place, San Diego, California 92121, United States
| | - John R. Teijaro
- Department
of Immunology and Microbiology, The Scripps
Research Institute, 10550
North Torrey Pines Road, La Jolla, California 92037, United States
| | - Kim D. Janda
- Departments
of Chemistry and Immunology, The Skaggs Institute for Chemical Biology,
Worm Institute of Research and Medicine (WIRM), The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, United States
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4
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Blake S, de Godoy RF. Kinematics and kinetics of dogs completing jump and A-frame exercises. Comparative Exercise Physiology 2021. [DOI: 10.3920/cep200067] [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: 11/19/2022]
Abstract
Many police dogs do not reach their expected retirement age as they are no longer able to cope with the physical demands of the job. Annual licensing requires police dogs to complete a series of agility tasks, including jumping and negotiating an A-frame obstacle, both of which are associated with higher injury rates in canine agility competitors. This study sought to measure conformational, kinematic, and kinetic parameters of actively employed police German Shepherd Dogs (GSDs), whilst completing a 55 cm jump hurdle, and a standard A-frame. Each dog completed three repetitions of each obstacle and was also recorded at both walk and trot. Contact pressures and forces were measured, whilst joint kinematics were recorded using reflective markers and a high-speed camera. Results found that static hip angle was significantly correlated with hip flexion at trot, during jump suspension and at the apex of the A-frame. Stifle and hock flexion were greatest during the suspension phase of jump (56.98±11.710° and 54.51±17.430°). Shoulder and elbow flexion were greatest at the apex of A-frame (104.34±16.744° and 75.72±20.804°), whilst carpal extension was highest upon landing from the jump (125.77±7.071°). Peak vertical force (PFz) when normalised for body mass (BM) increased when landing from A-frame (14.28 N/kg BM) as opposed to landing from the jump obstacle (12.055 N/kg·BM). Our results show that increased range of motion (ROM) is required during both jumping and negotiation of A-frame compared to walk and trot, but more significantly, greater forces are incurred upon landing from the A-frame than compared to jumping. It was also observed that dogs were subject to high degrees of torsion in the distal limbs upon landing from the A-frame due to trained behaviours. We conclude that use of agility equipment generates greater forces through the musculoskeletal system and requires a greater ROM than what is experienced at walk and trot, which may contribute to early retirement ages in police dogs.
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Affiliation(s)
- S. Blake
- Writtle University College, Lordship Road, Writtle, Chelmsford, CM1 3RR, United Kingdom
| | - R. Ferro de Godoy
- Writtle University College, Lordship Road, Writtle, Chelmsford, CM1 3RR, United Kingdom
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Abstract
Introduction Pi and colleagues reviewed eight case-control studies comparing the oral health (decayed, missing and filled teeth [DMFT], Plaque Index [PI], Gingival Index [GI] and salivary pH) of children with autism (n = 475) to children without autism (n = 565).Method The search strategy involved the use of PubMed, Embase, Web of Science, Cochrane Library, China National Knowledge Infrastructure (CNKI), Wanfang and Chinese Scientific and Technological Journal (VIP) to find case-control studies which met pre-defined inclusion criteria and were published before September 2018. The quality of each study was evaluated using the Newcastle-Ottowa Scale and only high-quality studies were included. Means and standard deviations for outcomes measured by each included study were presented. Data were pooled using the random-effects model via Review Manager 5.3, and presented as mean differences and 95% confidence intervals. Consistency was measured using I2. Sensitivity analysis was performed by removing one study with a large sample to explore effects on heterogeneity.Results The authors found eight eligible case-control studies conducted in Asia (n = 7) or South America (n = 1). Six of the eight compared DMFT of children with autism to those without and three of the eight compared PI, GI and/or salivary pH. While a meta-analysis is presented for each of the oral health outcome areas, there are discrepancies in the reporting. The included studies in each of the meta-analysis do not correspond with the characteristics of the studies provided.Conclusions The authors suggest from their meta-analyses that children with autism experience a higher prevalence of dental disease than children without autism. However, as currently presented, the study lacks internal validity and findings are not reliable.
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Affiliation(s)
- N Thomas
- Faculty of Health, University of Plymouth, UK.
| | - S Blake
- Child Health, University of Exeter Medical School, UK
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Blake S, Hemming I, Heng JIT, Agostino M. Structure-Based Approaches to Classify the Functional Impact of ZBTB18 Missense Variants in Health and Disease. ACS Chem Neurosci 2021; 12:979-989. [PMID: 33621064 DOI: 10.1021/acschemneuro.0c00758] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023] Open
Abstract
The Cys2His2 type zinc finger is a motif found in many eukaryotic transcription factor proteins that facilitates binding to genomic DNA so as to influence cellular gene expression. One such transcription factor is ZBTB18, characterized as a repressor that orchestrates the development of mammalian tissues including skeletal muscle and brain during embryogenesis. In humans, it has been recognized that disease-associated ZBTB18 missense variants mapping to the coding sequence of the zinc finger domain influence sequence-specific DNA binding, disrupt transcriptional regulation, and impair neural circuit formation in the brain. Furthermore, general population ZBTB18 missense variants that influence DNA binding and transcriptional regulation have also been documented within this domain; however, the molecular traits that explain why some variants cause disease while others do not are poorly understood. Here, we have applied five structure-based approaches to evaluate their ability to discriminate between disease-associated and general population ZBTB18 missense variants. We found that thermodynamic integration and Residue Scanning in the Schrodinger Biologics Suite were the best approaches for distinguishing disease-associated variants from general population variants. Our results demonstrate the effectiveness of structure-based approaches for the functional characterization of missense alleles to DNA binding, zinc finger transcription factor protein-coding genes that underlie human health and disease.
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Affiliation(s)
- Steven Blake
- Curtin Health Innovation Research Institute, Curtin University, Bentley, Western Australia 6102, Australia
- Ralph and Patricia Sarich Neuroscience Research Institute, Nedlands, Western Australia 6009, Australia
- School of Pharmacy and Biomedical Sciences, Curtin University, Bentley, Western Australia 6845, Australia
| | - Isabel Hemming
- Curtin Health Innovation Research Institute, Curtin University, Bentley, Western Australia 6102, Australia
- Ralph and Patricia Sarich Neuroscience Research Institute, Nedlands, Western Australia 6009, Australia
- The Faculty of Health and Medical Sciences, Medical School, The University of Western Australia, Crawley, Western Australia 6009, Australia
| | - Julian Ik-Tsen Heng
- Curtin Health Innovation Research Institute, Curtin University, Bentley, Western Australia 6102, Australia
- Ralph and Patricia Sarich Neuroscience Research Institute, Nedlands, Western Australia 6009, Australia
| | - Mark Agostino
- Curtin Health Innovation Research Institute, Curtin University, Bentley, Western Australia 6102, Australia
- School of Pharmacy and Biomedical Sciences, Curtin University, Bentley, Western Australia 6845, Australia
- Curtin Institute for Computation, Curtin University, Bentley, Western Australia, Australia
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Eubanks LM, Blake S, Natori Y, Ellis B, Bremer PT, Janda KD. A Highly Efficacious Carfentanil Vaccine That Blunts Opioid-Induced Antinociception and Respiratory Depression. ACS Chem Biol 2021; 16:277-282. [PMID: 33533592 DOI: 10.1021/acschembio.1c00026] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
The opioid epidemic remains a dire public health crisis with millions of people currently suffering from opioid use disorder (OUD) and tens of thousands dying each year. Synthetic opioids are most responsible for the crisis because of their extreme potency and ease of manufacture. Carfentanil for example has an estimated potency 10,000 times greater than morphine and thus is highly dangerous for human use. Herein, we report two synthetic opioid vaccines that elicited high-affinity antibodies against carfentanil and fentanyl with cross-reactivity to other synthetic opioids in mice and offered protection against opioid-induced respiratory depression, the primary cause of overdose deaths. These vaccines also successfully diminished drug biodistribution to the brain and shielded against opioid analgesic effects. Collectively, these findings provide new insights into the development of immunotherapeutic strategies aimed at opioid abuse and overdose.
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Affiliation(s)
- Lisa M. Eubanks
- Departments of Chemistry and Immunology, The Skaggs Institute for Chemical Biology, Worm Institute for Research and Medicine (WIRM), The Scripps Research Institute, La Jolla, California 92037, United States
| | - Steven Blake
- Departments of Chemistry and Immunology, The Skaggs Institute for Chemical Biology, Worm Institute for Research and Medicine (WIRM), The Scripps Research Institute, La Jolla, California 92037, United States
| | - Yoshihiro Natori
- Departments of Chemistry and Immunology, The Skaggs Institute for Chemical Biology, Worm Institute for Research and Medicine (WIRM), The Scripps Research Institute, La Jolla, California 92037, United States
| | - Beverly Ellis
- Departments of Chemistry and Immunology, The Skaggs Institute for Chemical Biology, Worm Institute for Research and Medicine (WIRM), The Scripps Research Institute, La Jolla, California 92037, United States
| | - Paul T. Bremer
- Departments of Chemistry and Immunology, The Skaggs Institute for Chemical Biology, Worm Institute for Research and Medicine (WIRM), The Scripps Research Institute, La Jolla, California 92037, United States
| | - Kim D. Janda
- Departments of Chemistry and Immunology, The Skaggs Institute for Chemical Biology, Worm Institute for Research and Medicine (WIRM), The Scripps Research Institute, La Jolla, California 92037, United States
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8
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Abstract
Synthetic cannabinoids (SCs) constitute a significant portion of psychoactive substances forming a major public health risk. Due to the wide variety of SCs, broadly neutralizing antibodies generated by active immunization present an intriguing pathway to combat cannabinoid use disorder. Here, we probed hapten design for antibody affinity and cross reactivity against two classes of SCs. Of the 10 haptens screened, 3 vaccine groups revealed submicromolar IC50, each targeting 5-6 compounds in our panel of 22 drugs. Moreover, SCs were successfully sequestered when administered by vaping or intraperitoneal injection, which was confirmed within animal models by observing locomotion, body temperature, and pharmacokinetics. We also discovered synergistic effects to simultaneously blunt two drug classes through an admixture vaccine approach. Collectively, our study provides a comprehensive foundation for the development of vaccines against SCs.
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Blake S, Bremer PT, Zhou B, Petrovsky N, Smith LC, Hwang CS, Janda KD. Developing Translational Vaccines against Heroin and Fentanyl through Investigation of Adjuvants and Stability. Mol Pharm 2021; 18:228-235. [PMID: 33301675 PMCID: PMC9946458 DOI: 10.1021/acs.molpharmaceut.0c00837] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
The nearly insurmountable adversity that accompanies opioid use disorder (OUD) creates life-altering complications for opioid users. To worsen matters, existing small-molecule drugs continue to inadequately address OUD due to their engagement of the opioid receptor, which can leave the user to deal with side effects and financial hardships from their repeated use. An alternative therapeutic approach utilizes endogenously generated antibodies through active vaccination to reduce the effect of opioids without modulating the opioid receptor. Here, we explore different adjuvants and storage conditions to improve opioid vaccine efficacy and shelf life. Our results revealed that inulin-based formulations (Advax) containing a CpG oligodeoxynucleotide (ODN) acted as effective adjuvants when combined with a heroin conjugate: immunized mice showed excellent recovery from heroin-induced antinociception accompanied by high titer, high opioid affinity serum antibodies similar to the immunopotentiating properties of traditional alum-based adjuvants. Moreover, nonhuman primates vaccinated with a heroin/fentanyl combination vaccine demonstrated potent antibody responses against opioids when formulated with both inulin and alum adjuvants. Finally, storing a freeze-dried opioid vaccine formulation maintained efficacy for up 1 year at room temperature. The results from our studies represent an advance toward a clinically feasible opioid vaccine.
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Affiliation(s)
- Steven Blake
- Departments of Chemistry and Immunology, The Skaggs Institute for Chemical Biology, Worm Institute of Research and Medicine (WIRM), The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, United States
| | - Paul T. Bremer
- Departments of Chemistry and Immunology, The Skaggs Institute for Chemical Biology, Worm Institute of Research and Medicine (WIRM), The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, United States,Cessation Therapeutics, LLC, 3031 Tisch Way, San Jose, California 95128, United States
| | - Bin Zhou
- Departments of Chemistry and Immunology, The Skaggs Institute for Chemical Biology, Worm Institute of Research and Medicine (WIRM), The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, United States
| | - Nikolai Petrovsky
- Flinders Medical Centre, Flinders University, GPO Box 2100, Adelaide 5001, South Australia, Australia,Vaxine Pty Ltd, 11 Walkley Avenue, Warradale 5046, South Australia, Australia
| | - Lauren C. Smith
- Departments of Chemistry and Immunology, The Skaggs Institute for Chemical Biology, Worm Institute of Research and Medicine (WIRM), The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, United States
| | - Candy S. Hwang
- Departments of Chemistry and Immunology, The Skaggs Institute for Chemical Biology, Worm Institute of Research and Medicine (WIRM), The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, United States
| | - Kim D. Janda
- Departments of Chemistry and Immunology, The Skaggs Institute for Chemical Biology, Worm Institute of Research and Medicine (WIRM), The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, United States,Corresponding Author: Kim D. Janda - The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, United States. Phone: (858), 785-2515. Fax: (858) 784-2595. .
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10
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Belz TF, Bremer PT, Zhou B, Blake S, Ellis B, Eubanks LM, Janda KD. Sulfonate-isosteric replacement examined within heroin-hapten vaccine design. Bioorg Med Chem Lett 2020; 30:127388. [PMID: 32738981 PMCID: PMC7398700 DOI: 10.1016/j.bmcl.2020.127388] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2020] [Revised: 06/27/2020] [Accepted: 06/30/2020] [Indexed: 10/23/2022]
Abstract
Heroin overdose and addiction remain significant health and economic burdens in the world today costing billions of dollars annually. Moreover, only limited pharmacotherapeutic options are available for treatment of heroin addiction. In our efforts to combat the public health threat posed by heroin addiction, we have developed vaccines against heroin. To expand upon our existing heroin-vaccine arsenal, we synthesized new aryl and alkyl sulfonate ester haptens; namely aryl-mono-sulfonate (HMsAc) and Aryl/alkyl-di-sulfonate (H(Ds)2) as carboxyl-isosteres of heroin then compared them to our model heroin-hapten (HAc) through vaccination studies. Heroin haptens were conjugated to the carrier protein CRM197 and the resulting CRM-immunoconjugates were used to vaccinate Swiss Webster mice following an established immunization protocol. Binding studies revealed that the highest affinity anti-heroin antibodies were generated by the HMsAc vaccine followed by the HAc and H(Ds)2 vaccines, respectively (HMsAc > HAc≫HDs2). However, neither the HMsAc nor H(Ds)2 vaccines were able to generate high affinity antibodies to the psychoactive metabolite 6-acetyl morphine (6-AM), in comparison to the HAc vaccine. Blood brain bio-distribution studies supported these binding results with vaccine efficiency following the trend HAc > HMsAc ≫ H(Ds)2 The work described herein provides insight into the use of hapten-isosteric replacement in vaccine drug design.
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Affiliation(s)
- Tyson F Belz
- Department of Chemistry, Department of Immunology and Microbial Science, The Skaggs Institute for Chemical Biology, The Worm Institute of Research and Medicine (WIRM), The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, United States
| | - Paul T Bremer
- Cessation Therapeutics LLC, 3031 Tisch Way Ste 505, San Jose, CA 95128, United States
| | - Bin Zhou
- Department of Chemistry, Department of Immunology and Microbial Science, The Skaggs Institute for Chemical Biology, The Worm Institute of Research and Medicine (WIRM), The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, United States
| | - Steven Blake
- Department of Chemistry, Department of Immunology and Microbial Science, The Skaggs Institute for Chemical Biology, The Worm Institute of Research and Medicine (WIRM), The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, United States
| | - Beverly Ellis
- Department of Chemistry, Department of Immunology and Microbial Science, The Skaggs Institute for Chemical Biology, The Worm Institute of Research and Medicine (WIRM), The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, United States
| | - Lisa M Eubanks
- Department of Chemistry, Department of Immunology and Microbial Science, The Skaggs Institute for Chemical Biology, The Worm Institute of Research and Medicine (WIRM), The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, United States
| | - Kim D Janda
- Department of Chemistry, Department of Immunology and Microbial Science, The Skaggs Institute for Chemical Biology, The Worm Institute of Research and Medicine (WIRM), The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, United States.
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11
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Hemming IA, Blake S, Agostino M, Heng JI. General population ZBTB18 missense variants influence DNA binding and transcriptional regulation. Hum Mutat 2020; 41:1629-1644. [DOI: 10.1002/humu.24069] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2020] [Revised: 05/28/2020] [Accepted: 06/22/2020] [Indexed: 12/26/2022]
Affiliation(s)
- Isabel A. Hemming
- The Harry Perkins Institute of Medical Research QEII Medical Centre Nedlands Western Australia Australia
- The Centre for Medical Research The University of Western Australia Crawley Western Australia Australia
- The Faculty of Health and Medical Sciences, Medical School The University of Western Australia Crawley Western Australia Australia
- Ralph and Patricia Sarich Neuroscience Research Institute Nedlands Western Australia Australia
- Curtin Health Innovation Research Institute Curtin University Bentley Western Australia Australia
| | - Steven Blake
- Ralph and Patricia Sarich Neuroscience Research Institute Nedlands Western Australia Australia
- Curtin Health Innovation Research Institute Curtin University Bentley Western Australia Australia
- School of Pharmacy and Biomedical Science Curtin University Bentley Western Australia Australia
| | - Mark Agostino
- Curtin Health Innovation Research Institute Curtin University Bentley Western Australia Australia
- School of Pharmacy and Biomedical Science Curtin University Bentley Western Australia Australia
- Curtin Institute for Computation Curtin University Bentley Western Australia Australia
| | - Julian I‐T. Heng
- Ralph and Patricia Sarich Neuroscience Research Institute Nedlands Western Australia Australia
- Curtin Health Innovation Research Institute Curtin University Bentley Western Australia Australia
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12
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Wang J, Ellis B, Zhou B, Eubanks LM, Blake S, Janda KD. A fentanyl vaccine constructed upon opsonizing antibodies specific for the Galα1-3Gal epitope. Chem Commun (Camb) 2020; 56:6551-6554. [PMID: 32396160 DOI: 10.1039/d0cc02107e] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A double conjugation strategy was implemented to produce an anti-fentanyl vaccine, which was predicated upon preformed-antibody-assisted antigen presentation. The new vaccine was found to reduce the psychoactive effects of fentanyl without the addition of the immunostimulant CpG oligodeoxynucleotide.
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Affiliation(s)
- Jiaxing Wang
- Department of Chemistry, Department of Immunology and Microbial Science, The Skaggs Institute for Chemical Biology, The Worm Institute for Research and Medicine (WIRM), The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA.
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13
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Blake S, Thanissery R, Rivera AJ, Hixon MS, Lin M, Theriot CM, Janda KD. Salicylanilide Analog Minimizes Relapse of Clostridioides difficile Infection in Mice. J Med Chem 2020; 63:6898-6908. [PMID: 32482070 DOI: 10.1021/acs.jmedchem.0c00123] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Clostridioides difficile infection (CDI) causes serious and sometimes fatal symptoms like diarrhea and pseudomembranous colitis. Although antibiotics for CDI exist, they are either expensive or cause recurrence of the infection due to their altering the colonic microbiota, which is necessary to suppress the infection. Here, we leverage a class of known membrane-targeting compounds that we previously showed to have broad inhibitory activity across multiple Clostridioides difficile strains while preserving the microbiome to develop an efficacious agent. A new series of salicylanilides was synthesized, and the most potent analog was selected through an in vitro inhibitory assay to evaluate its pharmacokinetic parameters and potency in a CDI mouse model. The results revealed reduced recurrence of CDI and diminished disturbance of the microbiota in mice compared to standard-of-care vancomycin, thus paving the way for novel therapy that can potentially target the cell membrane of C. difficile to minimize relapse in the recovering patient.
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Affiliation(s)
- Steven Blake
- Departments of Chemistry and Immunology, The Skaggs Institute for Chemical Biology, Worm Institute of Research and Medicine (WIRM), The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, United States
| | - Rajani Thanissery
- Department of Population Health and Pathobiology, College of Veterinary Medicine, North Carolina State University, Raleigh, North Carolina 27607, United States
| | - Alissa J Rivera
- Department of Population Health and Pathobiology, College of Veterinary Medicine, North Carolina State University, Raleigh, North Carolina 27607, United States
| | - Mark S Hixon
- Mark S. Hixon Consulting, LLC., 11273 Spitfire Road, San Diego, California 92126, United States
| | - Mingliang Lin
- Departments of Chemistry and Immunology, The Skaggs Institute for Chemical Biology, Worm Institute of Research and Medicine (WIRM), The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, United States
| | - Casey M Theriot
- Department of Population Health and Pathobiology, College of Veterinary Medicine, North Carolina State University, Raleigh, North Carolina 27607, United States
| | - Kim D Janda
- Departments of Chemistry and Immunology, The Skaggs Institute for Chemical Biology, Worm Institute of Research and Medicine (WIRM), The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, United States
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Williams M, Blake S, Matthews H. Mitigating the risk of aerosol generation from power tools during the COVID-19 pandemic. Ann R Coll Surg Engl 2020; 102:393-394. [PMID: 32324054 DOI: 10.1308/rcsann.2020.0082] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Affiliation(s)
| | - S Blake
- Torbay Hospital, Torquay, UK
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15
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Schwienteck KL, Blake S, Bremer PT, Poklis JL, Townsend EA, Negus SS, Banks ML. Effectiveness and selectivity of a heroin conjugate vaccine to attenuate heroin, 6-acetylmorphine, and morphine antinociception in rats: Comparison with naltrexone. Drug Alcohol Depend 2019; 204:107501. [PMID: 31479865 PMCID: PMC6878171 DOI: 10.1016/j.drugalcdep.2019.06.006] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/14/2019] [Revised: 06/09/2019] [Accepted: 06/10/2019] [Indexed: 01/05/2023]
Abstract
BACKGROUND One emerging strategy to address the opioid crisis includes opioid-targeted immunopharmacotherapies. This study compared effectiveness of a heroin-tetanus toxoid (TT) conjugate vaccine to antagonize heroin, 6-acetylmorphine (6-AM), morphine, and fentanyl antinociception in rats. METHODS Adult male and female Sprague Dawley rats received three doses of active or control vaccine at weeks 0, 2, and 4. Vaccine pharmacological selectivity was assessed by comparing opioid dose-effect curves in 50 °C warm-water tail-withdrawal procedure before and after active or control heroin-TT vaccine. Route of heroin administration [subcutaneous (SC) vs. intravenous [IV)] was also examined as a determinant of vaccine effectiveness. Continuous naltrexone treatment (0.0032-0.032 mg/kg/h) effects on heroin, 6-AM, and morphine antinociceptive potency were also determined as a benchmark for minimal vaccine effectiveness. RESULTS The heroin-TT vaccine decreased potency of SC heroin (5-fold), IV heroin (3-fold), and IV 6-AM (3-fold) for several weeks without affecting IV morphine or SC and IV fentanyl potency. The control vaccine did not alter potency of any opioid. Naltrexone dose-dependently decreased antinociceptive potency of SC heroin, and treatment with 0.01 mg/kg/h naltrexone produced similar, approximate 8-fold decreases in potencies of SC and IV heroin, IV 6-AM, and IV morphine. The combination of naltrexone and active vaccine was more effective than naltrexone alone to antagonize SC heroin but not IV heroin. CONCLUSIONS The heroin-TT vaccine formulation examined is less effective, but more selective, than chronic naltrexone to attenuate heroin antinociception in rats. Furthermore, these results provide an empirical framework for future preclinical opioid vaccine research to benchmark effectiveness against naltrexone.
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Affiliation(s)
- Kathryn L. Schwienteck
- Department of Pharmacology and Toxicology, Virginia Commonwealth University School of Medicine, Richmond, VA 23298 USA
| | - Steven Blake
- Departments of Chemistry and Immunology and Microbial Science, Skaggs Institute for Chemical Biology, Worm Institute for Research and Medicine, The Scripps Research Institute, La Jolla, CA 92037, USA
| | - Paul T. Bremer
- Departments of Chemistry and Immunology and Microbial Science, Skaggs Institute for Chemical Biology, Worm Institute for Research and Medicine, The Scripps Research Institute, La Jolla, CA 92037, USA
| | - Justin L. Poklis
- Department of Pharmacology and Toxicology, Virginia Commonwealth University School of Medicine, Richmond, VA 23298 USA
| | - E. Andrew Townsend
- Department of Pharmacology and Toxicology, Virginia Commonwealth University School of Medicine, Richmond, VA 23298 USA
| | - S. Stevens Negus
- Department of Pharmacology and Toxicology, Virginia Commonwealth University School of Medicine, Richmond, VA 23298 USA
| | - Matthew L. Banks
- Department of Pharmacology and Toxicology, Virginia Commonwealth University School of Medicine, Richmond, VA 23298 USA
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Tenney RD, Blake S, Bremer PT, Zhou B, Hwang CS, Poklis JL, Janda KD, Banks ML. Vaccine blunts fentanyl potency in male rhesus monkeys. Neuropharmacology 2019; 158:107730. [PMID: 31369740 PMCID: PMC6745253 DOI: 10.1016/j.neuropharm.2019.107730] [Citation(s) in RCA: 40] [Impact Index Per Article: 8.0] [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: 03/16/2019] [Revised: 07/25/2019] [Accepted: 07/28/2019] [Indexed: 11/30/2022]
Abstract
One proposed factor contributing to the increased frequency of opioid overdose deaths is the emergence of novel synthetic opioids, including illicit fentanyl and fentanyl analogues. A treatment strategy currently under development to address the ongoing opioid crisis is immunopharmacotherapies or opioid-targeted vaccines. The present study determined the effectiveness and selectivity of a fentanyl-tetanus toxoid conjugate vaccine to alter the behavioral effects of fentanyl and a structurally dissimilar mu-opioid agonist oxycodone in male rhesus monkeys (n = 3-4). Fentanyl and oxycodone produced dose-dependent suppression of behavior in an assay of schedule-controlled responding and antinociception in an assay of thermal nociception (50 °C). Acute naltrexone (0.032 mg/kg) produced an approximate 10-fold potency shift for fentanyl to decrease operant responding. The fentanyl vaccine was administered at weeks 0, 2, 4, 9, 19, and 44 and fentanyl or oxycodone potencies in both behavioral assays were redetermined over the course of 49 weeks. The vaccine significantly and selectively shifted fentanyl potency at least 10-fold in both assays at several time points over the entire experimental period. Mid-point titer levels correlated with fentanyl antinociceptive potency shifts. Antibody affinity for fentanyl as measured by a competitive binding assay improved over time to approximately 3-4 nM. The fentanyl vaccine also increased fentanyl plasma levels approximately 6-fold consistent with the hypothesis that the vaccine sequesters fentanyl in the blood. Overall, these results support the continued development and evaluation of this fentanyl vaccine in humans to address the ongoing opioid crisis.
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Affiliation(s)
- Rebekah D Tenney
- Department of Pharmacology and Toxicology, Virginia Commonwealth University School of Medicine, Richmond, VA, 23298, USA
| | - Steven Blake
- Departments of Chemistry and Immunology and Microbial Science, Skaggs Institute for Chemical Biology, Worm Institute for Research and Medicine, The Scripps Research Institute, La Jolla, CA, 92037, USA
| | - Paul T Bremer
- Departments of Chemistry and Immunology and Microbial Science, Skaggs Institute for Chemical Biology, Worm Institute for Research and Medicine, The Scripps Research Institute, La Jolla, CA, 92037, USA
| | - Bin Zhou
- Departments of Chemistry and Immunology and Microbial Science, Skaggs Institute for Chemical Biology, Worm Institute for Research and Medicine, The Scripps Research Institute, La Jolla, CA, 92037, USA
| | - Candy S Hwang
- Departments of Chemistry and Immunology and Microbial Science, Skaggs Institute for Chemical Biology, Worm Institute for Research and Medicine, The Scripps Research Institute, La Jolla, CA, 92037, USA
| | - Justin L Poklis
- Department of Pharmacology and Toxicology, Virginia Commonwealth University School of Medicine, Richmond, VA, 23298, USA
| | - Kim D Janda
- Departments of Chemistry and Immunology and Microbial Science, Skaggs Institute for Chemical Biology, Worm Institute for Research and Medicine, The Scripps Research Institute, La Jolla, CA, 92037, USA.
| | - Matthew L Banks
- Department of Pharmacology and Toxicology, Virginia Commonwealth University School of Medicine, Richmond, VA, 23298, USA.
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17
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Hunter A, Blake S, De Godoy RF. Pressure and force on the canine neck when exercised using a collar and leash. Vet Anim Sci 2019; 8:100082. [PMID: 32734099 PMCID: PMC7386734 DOI: 10.1016/j.vas.2019.100082] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2019] [Revised: 10/12/2019] [Accepted: 10/23/2019] [Indexed: 12/01/2022] Open
Abstract
A double layer polyester/nylon collar decreased mean contact pressure on the neck when compared to single layer collars. Peak forces were highest under a double layer polyester/nylon collar in all 3 directions of travel – clockwise, anticlockwise and straight. No significant differences between collar material and direction of travel were found when comparing mean contact pressure. Highest forces were identified when a dog walks in an anticlockwise direction away from a handler. Average overall peak force was 30.2 N.
The aim of this study was to assess the pressure and force applied to the canine neck at walk when using collars of different material. Three different collars of equal size but different construction were used. A double-layer polyester and nylon weave (DN), a single layer nylon weave (SN), and a single layer canvas (SC). Eight dogs wore all three types of collar and were led in a randomized order through a course containing straight, clockwise and counterclockwise sections. Force and pressure were measured and recorded using a TekscanⓇ F-Scan In-shoe system and analyzed using SPSS statistical software. Peak force and contact pressure were significantly higher under DN collar when compared with the others (p < 0.0005 and p = 0.001, respectively). Whilst differences in mean force were not observed between collars, there were significant differences depending on the direction of travel of the dog (p < 0.0005), being highest in a counter-clockwise direction, and lowest in a straight line. Peak contact pressure was not significantly different in any condition. Results suggest that collar construction material will alter contact pressures and peak force exerted on the neck, and that a double layer nylon weave collar with ethylene-vinyl acetate cushioning has a higher contact pressure than either a single layer nylon or canvas construction, which may be contrary to an owners expectations when purchasing a collar. Furthermore, forces will vary depending on the direction of travel in relation to the handler.
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Affiliation(s)
- A Hunter
- Writtle University College, Lordship Rd, Writtle, Chelmsford, Essex CM1 3RR, United Kingdom
| | - S Blake
- Writtle University College, Lordship Rd, Writtle, Chelmsford, Essex CM1 3RR, United Kingdom
| | - R Ferro De Godoy
- Writtle University College, Lordship Rd, Writtle, Chelmsford, Essex CM1 3RR, United Kingdom
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18
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Townsend EA, Blake S, Faunce KE, Hwang CS, Natori Y, Zhou B, Bremer PT, Janda KD, Banks ML. Conjugate vaccine produces long-lasting attenuation of fentanyl vs. food choice and blocks expression of opioid withdrawal-induced increases in fentanyl choice in rats. Neuropsychopharmacology 2019; 44:1681-1689. [PMID: 31043682 PMCID: PMC6784909 DOI: 10.1038/s41386-019-0385-9] [Citation(s) in RCA: 49] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/03/2019] [Revised: 02/19/2019] [Accepted: 04/01/2019] [Indexed: 12/31/2022]
Abstract
The current opioid crisis remains a significant public health issue and there is a critical need for biomedical research to develop effective and easily deployable candidate treatments. One emerging treatment strategy for opioid use disorder includes immunopharmacotherapies or opioid-targeted vaccines. The present study determined the effectiveness of a fentanyl-tetanus toxoid conjugate vaccine to alter fentanyl self-administration using a fentanyl-vs.-food choice procedure in male and female rats under three experimental conditions. For comparison, continuous 7-day naltrexone (0.01-0.1 mg/kg/h) and 7-day clonidine (3.2-10 μg/kg/h) treatment effects were also determined on fentanyl-vs.-food choice. Male and female rats responded for concurrently available 18% diluted Ensure® (liquid food) and fentanyl (0-10 μg/kg/infusion) infusions during daily sessions. Under baseline and saline treatment conditions, fentanyl maintained a dose-dependent increase in fentanyl-vs.-food choice. First, fentanyl vaccine administration significantly blunted fentanyl reinforcement and increased food reinforcement for 15 weeks in non-opioid dependent rats. Second, surmountability experiments by increasing the unit fentanyl dose available during the self-administration session 10-fold empirically determined that the fentanyl vaccine produced an approximate 22-fold potency shift in fentanyl-vs.-food choice that was as effective as the clinically approved treatment naltrexone. Clonidine treatment significantly increased fentanyl-vs.-food choice. Lastly, fentanyl vaccine administration prevented the expression of withdrawal-associated increases in fentanyl-vs.-food choice following introduction of extended 12 h fentanyl access sessions. Overall, these results support the potential and further consideration of immunopharmacotherapies as candidate treatments to address the current opioid crisis.
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Affiliation(s)
- E Andrew Townsend
- Department of Pharmacology and Toxicology, Virginia Commonwealth University School of Medicine, Richmond, VA, 23298, USA
| | - Steven Blake
- Departments of Chemistry and Immunology and Microbial Science, Skaggs Institute for Chemical Biology, Worm Institute for Research and Medicine, The Scripps Research Institute, La Jolla, CA, 92037, USA
| | - Kaycee E Faunce
- Department of Pharmacology and Toxicology, Virginia Commonwealth University School of Medicine, Richmond, VA, 23298, USA
| | - Candy S Hwang
- Departments of Chemistry and Immunology and Microbial Science, Skaggs Institute for Chemical Biology, Worm Institute for Research and Medicine, The Scripps Research Institute, La Jolla, CA, 92037, USA
- Department of Chemistry, Southern Connecticut State University, 501 Crescent St, New Haven, CT, 06515, USA
| | - Yoshihiro Natori
- Departments of Chemistry and Immunology and Microbial Science, Skaggs Institute for Chemical Biology, Worm Institute for Research and Medicine, The Scripps Research Institute, La Jolla, CA, 92037, USA
- Faculty of Pharmaceutical Sciences, Tohoku Medical and Pharmaceutical University, Komatsushima 4-4-1, Aoba-ku, Sendai, 981-8558, Japan
| | - Bin Zhou
- Departments of Chemistry and Immunology and Microbial Science, Skaggs Institute for Chemical Biology, Worm Institute for Research and Medicine, The Scripps Research Institute, La Jolla, CA, 92037, USA
| | - Paul T Bremer
- Departments of Chemistry and Immunology and Microbial Science, Skaggs Institute for Chemical Biology, Worm Institute for Research and Medicine, The Scripps Research Institute, La Jolla, CA, 92037, USA
| | - Kim D Janda
- Departments of Chemistry and Immunology and Microbial Science, Skaggs Institute for Chemical Biology, Worm Institute for Research and Medicine, The Scripps Research Institute, La Jolla, CA, 92037, USA.
| | - Matthew L Banks
- Department of Pharmacology and Toxicology, Virginia Commonwealth University School of Medicine, Richmond, VA, 23298, USA.
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19
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Deshpande S, Blake S, Holloway L, Vial P. EP-1791: Evaluation of a water equivalent EPID model for flattening filter free (FFF) beam transit dosimetry. Radiother Oncol 2018. [DOI: 10.1016/s0167-8140(18)32100-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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20
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Ros S, Flöter J, Kaymak I, Da Costa C, Houddane A, Dubuis S, Griffiths B, Mitter R, Walz S, Blake S, Behrens A, Brindle KM, Zamboni N, Rider MH, Schulze A. 6-Phosphofructo-2-kinase/fructose-2,6-biphosphatase 4 is essential for p53-null cancer cells. Oncogene 2017; 36:3287-3299. [PMID: 28092678 DOI: 10.1038/onc.2016.477] [Citation(s) in RCA: 54] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2015] [Revised: 11/08/2016] [Accepted: 11/15/2016] [Indexed: 01/02/2023]
Abstract
The bifunctional enzyme 6-phosphofructo-2-kinase/fructose-2,6-biphosphatase-4 (PFKFB4) controls metabolic flux through allosteric regulation of glycolysis. Here we show that p53 regulates the expression of PFKFB4 and that p53-deficient cancer cells are highly dependent on the function of this enzyme. We found that p53 downregulates PFKFB4 expression by binding to its promoter and mediating transcriptional repression via histone deacetylases. Depletion of PFKFB4 from p53-deficient cancer cells increased levels of the allosteric regulator fructose-2,6-bisphosphate, leading to increased glycolytic activity but decreased routing of metabolites through the oxidative arm of the pentose-phosphate pathway. PFKFB4 was also required to support the synthesis and regeneration of nicotinamide adenine dinucleotide phosphate (NADPH) in p53-deficient cancer cells. Moreover, depletion of PFKFB4-attenuated cellular biosynthetic activity and resulted in the accumulation of reactive oxygen species and cell death in the absence of p53. Finally, silencing of PFKFB4-induced apoptosis in p53-deficient cancer cells in vivo and interfered with tumour growth. These results demonstrate that PFKFB4 is essential to support anabolic metabolism in p53-deficient cancer cells and suggest that inhibition of PFKFB4 could be an effective strategy for cancer treatment.
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Affiliation(s)
- S Ros
- Gene Expression Analysis Laboratory, Cancer Research UK London Research Institute, London, UK
- Cancer Research UK Cambridge Institute, University of Cambridge, Cambridge, UK
| | - J Flöter
- Theodor-Boveri-Institute, Biocenter, Am Hubland, Würzburg, Germany
| | - I Kaymak
- Theodor-Boveri-Institute, Biocenter, Am Hubland, Würzburg, Germany
| | - C Da Costa
- Adult Stem Cell Laboratory, The Francis Crick Institute, London, UK
| | - A Houddane
- Protein Phosphorylation Unit, de Duve Institute, Université Catholique de Louvain, Brussels, Belgium
| | - S Dubuis
- Institute of Molecular Systems Biology, ETH Zurich, Zurich, Switzerland
| | - B Griffiths
- Gene Expression Analysis Laboratory, Cancer Research UK London Research Institute, London, UK
| | - R Mitter
- Bioinformatics and Biostatistics, The Francis Crick Institute, London, UK
| | - S Walz
- Comprehensive Cancer Center, Core Unit Bioinformatics, Biocenter, Würzburg, Germany
| | - S Blake
- Adult Stem Cell Laboratory, The Francis Crick Institute, London, UK
| | - A Behrens
- Adult Stem Cell Laboratory, The Francis Crick Institute, London, UK
- Faculty of Life Sciences and Medicine, King's College London, Guy's Campus, London, UK
| | - K M Brindle
- Cancer Research UK Cambridge Institute, University of Cambridge, Cambridge, UK
| | - N Zamboni
- Institute of Molecular Systems Biology, ETH Zurich, Zurich, Switzerland
| | - M H Rider
- Protein Phosphorylation Unit, de Duve Institute, Université Catholique de Louvain, Brussels, Belgium
| | - A Schulze
- Gene Expression Analysis Laboratory, Cancer Research UK London Research Institute, London, UK
- Theodor-Boveri-Institute, Biocenter, Am Hubland, Würzburg, Germany
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21
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Vial P, Blake S, Cheng Z, Deshpande S, Atakaramians S, Lu M, Meikle S, Greer P, Kuncic Z. PO-0767: Revisiting EPID design for modern radiotherapy requirements. Radiother Oncol 2017. [DOI: 10.1016/s0167-8140(17)31204-5] [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: 11/28/2022]
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22
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Thwaites D, Pogson E, Arumugam S, Hansen C, Currie M, Blake S, Roberts N, Carolan M, Vial P, Juresic J, Ochoa C, Yakobi J, Haman A, Trtovac A, Al-Harthi T, Holloway L. PO-0808: Comparison of multi-institutional QA for VMAT of Nasopharynx with simulated delivery errors. Radiother Oncol 2017. [DOI: 10.1016/s0167-8140(17)31245-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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23
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Barnett GV, Razinkov VI, Kerwin BA, Blake S, Qi W, Curtis RA, Roberts CJ. Reply to "Comment on 'Osmolyte Effects on Monoclonal Antibody Stability and Concentration-Dependent Protein Interactions with Water and Common Osmolytes'". J Phys Chem B 2016; 120:11333-11334. [PMID: 27715047 DOI: 10.1021/acs.jpcb.6b06832] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Gregory V Barnett
- Department of Chemical and Biomolecular Engineering, University of Delaware , Newark, Delaware 19716, United States
| | - Vladimir I Razinkov
- Drug Product Development, Amgen Inc. , Seattle, Washington 98119, United States
| | - Bruce A Kerwin
- Drug Product Development, Amgen Inc. , Seattle, Washington 98119, United States
| | - Steven Blake
- Malvern Biosciences Inc. , Columbia, Maryland 21046, United States
| | - Wei Qi
- Malvern Biosciences Inc. , Columbia, Maryland 21046, United States
| | - Robin A Curtis
- School of Chemical Engineering and Analytical Science, The University of Manchester , Manchester M13 9PL, U.K
| | - Christopher J Roberts
- Department of Chemical and Biomolecular Engineering, University of Delaware , Newark, Delaware 19716, United States
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24
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Blake S, Petagna C, Hamblin R. ISQUA16-2603HALVING BROKEN HIPS IN HOSPITAL – THE NEW ZEALAND EXPERIENCE. Int J Qual Health Care 2016. [DOI: 10.1093/intqhc/mzw104.3] [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: 11/13/2022] Open
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Abstract
We report the case of a 56-year-old woman with a 7-year history of metastatic cancer who presented with severe copper deficiency following self-treatment with the copper-chelating agent tetrathiomolybdate. This compound was used with the aim of inhibiting tumour angiogenesis and was obtained from the USA by placing an order on the internet. The patient exhibited severe neutropenia as her serum copper concentration fell from 19.8 μmol/L to 3.3 μmol/L and her caeruloplasmin concentration from 35 mg/dL to 4 mg/dL.
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Affiliation(s)
- T F Lang
- Department of Clinical Biochemistry, The John Radcliffe Hospital, Oxford, OX3 9DU, UK.
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Pogson E, Hansen C, Blake S, Arumugam S, Juresic J, Ochoa C, Yakobi J, Haman A, Trtovac A, Holloway L, Thwaites D. SU-D-201-01: A Multi-Institutional Study Quantifying the Impact of Simulated Linear Accelerator VMAT Errors for Nasopharynx. Med Phys 2016. [DOI: 10.1118/1.4955613] [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: 11/07/2022] Open
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27
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Pogson EM, Hansen C, Blake S, Arumugam S, Holloway L, Thwaites D. SU-F-T-384: Step and Shoot IMRT, VMAT and Autoplan VMAT Nasopharnyx Plan Robustness to Linear Accelerator Delivery Errors. Med Phys 2016. [DOI: 10.1118/1.4956569] [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: 11/07/2022] Open
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28
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Barnett GV, Razinkov VI, Kerwin BA, Blake S, Qi W, Curtis RA, Roberts CJ. Osmolyte Effects on Monoclonal Antibody Stability and Concentration-Dependent Protein Interactions with Water and Common Osmolytes. J Phys Chem B 2016; 120:3318-30. [DOI: 10.1021/acs.jpcb.6b00621] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Gregory V. Barnett
- Department
of Chemical and Biomolecular Engineering, University of Delaware, Newark, Delaware 19716, United States
| | | | - Bruce A. Kerwin
- Drug
Product Development, Amgen Inc., Seattle, Washington 98119, United States
| | - Steven Blake
- Malvern Biosciences
Inc., Columbia, Maryland 21046, United States
| | - Wei Qi
- Malvern Biosciences
Inc., Columbia, Maryland 21046, United States
| | - Robin A. Curtis
- School
of Chemical Engineering and Analytical Science, The University of Manchester, Manchester, U.K
| | - Christopher J. Roberts
- Department
of Chemical and Biomolecular Engineering, University of Delaware, Newark, Delaware 19716, United States
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29
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Smith KS, Kaldor JM, Hocking JS, Jamil MS, McNulty AM, Read P, Bradshaw CS, Chen MY, Fairley CK, Wand H, Worthington K, Blake S, Knight V, Rawlinson W, Saville M, Tabrizi SN, Garland SM, Donovan B, Guy R. The acceptability and cost of a home-based chlamydia retesting strategy: findings from the REACT randomised controlled trial. BMC Public Health 2016; 16:83. [PMID: 26822715 PMCID: PMC4730759 DOI: 10.1186/s12889-016-2727-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2015] [Accepted: 01/13/2016] [Indexed: 11/30/2022] Open
Abstract
Background Chlamydia retesting three months after treatment is recommended to detect reinfections, but retesting rates are typically low. The REACT (retest after Chlamydia trachomatis) randomised trial demonstrated that home-based retesting using postal home-collection kits and SMS reminders, resulted in substantial improvements in retesting rates in women, heterosexual men and men who have sex with men (MSM), with detection of more repeat positive tests compared with SMS reminder alone. In the context of this trial, the acceptability of the home-based strategy was evaluated and the costs of the two strategies were compared. Methods REACT participants (200 women, 200 heterosexual men, 200 MSM) were asked to complete an online survey that included home-testing acceptability and preferred methods of retesting. The demographics, sexual behaviour and acceptability of home collection were compared between those preferring home-testing versus clinic-based retesting or no preference, using a chi-square test. The costs to the health system of the clinic-based and home retesting strategies and the cost per infection for each were also compared. Results Overall 445/600 (74 %) participants completed the survey; 236/445 from the home-testing arm, and 141 of these (60 %) retested at home. The majority of home arm retesters were comfortable having the kit posted to their home (86 %); found it easy to follow the instructions and collect the specimens (96 %); were confident they had collected the specimens correctly (90 %); and reported no problems (70 %). Most (65 %) preferred home retesting, 21 % had no preference and 14 % preferred clinic retesting. Comparing those with a preference for home testing to those who didn’t, there were significant differences in being comfortable having a kit sent to their home (p = 0.045); not having been diagnosed with chlamydia previously (p = 0.030); and living with friends (p = 0.034). The overall cost for the home retest pathway was $154 (AUD), compared to $169 for the clinic-based retesting pathway and the cost per repeat infection detected was $1409 vs $3133. Conclusions Among individuals initially diagnosed with chlamydia in a sexual health clinic setting, home-based retesting was shown to be highly acceptable, preferred by most participants, and cost-efficient. However some clients preferred clinic-based testing, often due to confidentiality concerns in their home environment. Both options should be provided to maximise retesting rates. Trial registration The trial was registered with the Australia New Zealand Clinical Trials Registry on September 9, 2011: ACTRN12611000968976. Electronic supplementary material The online version of this article (doi:10.1186/s12889-016-2727-4) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- K S Smith
- The Kirby Institute, UNSW Australia, Sydney, Australia.
| | - J M Kaldor
- The Kirby Institute, UNSW Australia, Sydney, Australia
| | - J S Hocking
- Melbourne School of Population and Global Health, University of Melbourne, Melbourne, Australia
| | - M S Jamil
- The Kirby Institute, UNSW Australia, Sydney, Australia
| | - A M McNulty
- Sydney Sexual Health Centre, Sydney, Australia.,School of Public Health and Community Medicine, UNSW Australia, Sydney, Australia
| | - P Read
- Kirketon Road Centre, Sydney, Australia
| | - C S Bradshaw
- Melbourne Sexual Health Centre, Melbourne, Australia.,Central Clinical School, Monash University, Melbourne, Australia
| | - M Y Chen
- Melbourne Sexual Health Centre, Melbourne, Australia.,Central Clinical School, Monash University, Melbourne, Australia
| | - C K Fairley
- Melbourne Sexual Health Centre, Melbourne, Australia.,Central Clinical School, Monash University, Melbourne, Australia
| | - H Wand
- The Kirby Institute, UNSW Australia, Sydney, Australia
| | - K Worthington
- Melbourne Sexual Health Centre, Melbourne, Australia
| | - S Blake
- Sydney Sexual Health Centre, Sydney, Australia
| | - V Knight
- Sydney Sexual Health Centre, Sydney, Australia
| | - W Rawlinson
- Serology and Virology Division, (SAViD) SEALS Microbiology, Prince of Wales Hospital, Sydney, Australia
| | | | - S N Tabrizi
- Department of Obstetrics and Gynaecology, University of Melbourne, Melbourne, Australia.,Department of Microbiology, Royal Children's Hospital, Melbourne, Australia.,Department of Microbiology and Infectious Diseases, Royal Women's Hospital, Melbourne, Australia.,Murdoch Childrens Research Institute, Melbourne, Australia
| | - S M Garland
- Department of Obstetrics and Gynaecology, University of Melbourne, Melbourne, Australia.,Department of Microbiology, Royal Children's Hospital, Melbourne, Australia.,Department of Microbiology and Infectious Diseases, Royal Women's Hospital, Melbourne, Australia.,Murdoch Childrens Research Institute, Melbourne, Australia
| | - B Donovan
- The Kirby Institute, UNSW Australia, Sydney, Australia
| | - R Guy
- The Kirby Institute, UNSW Australia, Sydney, Australia
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Deshpande S, Blake S, Metcalfe P, Holloway L, Vial P. Incorporating a Water Equivalent EPID into a Radiation Therapy Treatment Planning System for In Vivo Dosimetry. Int J Radiat Oncol Biol Phys 2015. [DOI: 10.1016/j.ijrobp.2015.07.1953] [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: 11/30/2022]
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Amini K, Blake S, Brouard M, Burt MB, Halford E, Lauer A, Slater CS, Lee JWL, Vallance C. Three-dimensional imaging of carbonyl sulfide and ethyl iodide photodissociation using the pixel imaging mass spectrometry camera. Rev Sci Instrum 2015; 86:103113. [PMID: 26520946 DOI: 10.1063/1.4934544] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
The Pixel Imaging Mass Spectrometry (PImMS) camera is used in proof-of-principle three-dimensional imaging experiments on the photodissociation of carbonyl sulfide and ethyl iodide at wavelengths around 230 nm and 245 nm, respectively. Coupling the PImMS camera with DC-sliced velocity-map imaging allows the complete three-dimensional Newton sphere of photofragment ions to be recorded on each laser pump-probe cycle with a timing precision of 12.5 ns, yielding velocity resolutions along the time-of-flight axis of around 6%-9% in the applications presented.
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Affiliation(s)
- K Amini
- The Physical and Theoretical Chemistry Laboratory, The Department of Chemistry, University of Oxford, South Parks Road, Oxford OX1 3QZ, United Kingdom
| | - S Blake
- The Physical and Theoretical Chemistry Laboratory, The Department of Chemistry, University of Oxford, South Parks Road, Oxford OX1 3QZ, United Kingdom
| | - M Brouard
- The Physical and Theoretical Chemistry Laboratory, The Department of Chemistry, University of Oxford, South Parks Road, Oxford OX1 3QZ, United Kingdom
| | - M B Burt
- The Physical and Theoretical Chemistry Laboratory, The Department of Chemistry, University of Oxford, South Parks Road, Oxford OX1 3QZ, United Kingdom
| | - E Halford
- The Physical and Theoretical Chemistry Laboratory, The Department of Chemistry, University of Oxford, South Parks Road, Oxford OX1 3QZ, United Kingdom
| | - A Lauer
- The Physical and Theoretical Chemistry Laboratory, The Department of Chemistry, University of Oxford, South Parks Road, Oxford OX1 3QZ, United Kingdom
| | - C S Slater
- The Physical and Theoretical Chemistry Laboratory, The Department of Chemistry, University of Oxford, South Parks Road, Oxford OX1 3QZ, United Kingdom
| | - J W L Lee
- The Chemistry Research Laboratory, The Department of Chemistry, University of Oxford, 12 Mansfield Road, Oxford OX1 3TA, United Kingdom
| | - C Vallance
- The Chemistry Research Laboratory, The Department of Chemistry, University of Oxford, 12 Mansfield Road, Oxford OX1 3TA, United Kingdom
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Blake S, Amin S, Qi W, Majumdar M, Lewis EN. Colloidal Stability & Conformational Changes in β-Lactoglobulin: Unfolding to Self-Assembly. Int J Mol Sci 2015; 16:17719-33. [PMID: 26247930 PMCID: PMC4581217 DOI: 10.3390/ijms160817719] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2015] [Revised: 07/23/2015] [Accepted: 07/27/2015] [Indexed: 11/16/2022] Open
Abstract
A detailed understanding of the mechanism of unfolding, aggregation, and associated rheological changes is developed in this study for β-Lactoglobulin at different pH values through concomitant measurements utilizing dynamic light scattering (DLS), optical microrheology, Raman spectroscopy, and differential scanning calorimetry (DSC). The diffusion interaction parameter kD emerges as an accurate predictor of colloidal stability for this protein consistent with observed aggregation trends and rheology. Drastic aggregation and gelation were observed at pH 5.5. Under this condition, the protein's secondary and tertiary structures changed simultaneously. At higher pH (7.0 and 8.5), oligomerizaton with no gel formation occurred. For these solutions, tertiary structure and secondary structure transitions were sequential. The low frequency Raman data, which is a good indicator of hydrogen bonding and structuring in water, has been shown to exhibit a strong correlation with the rheological evolution with temperature. This study has, for the first time, demonstrated that this low frequency Raman data, in conjunction with the DSC endotherm, can be been utilized to deconvolve protein unfolding and aggregation/gelation. These findings can have important implications for the development of protein-based biotherapeutics, where the formulation viscosity, aggregation, and stability strongly affects efficacy or in foods where protein structuring is critical for functional and sensory performance.
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Affiliation(s)
- Steven Blake
- Malvern Instruments, 7221 Lee Deforest Drive, Suite 300, Columbia, MD 21046, USA.
| | - Samiul Amin
- Malvern Instruments, 7221 Lee Deforest Drive, Suite 300, Columbia, MD 21046, USA.
| | - Wei Qi
- Malvern Instruments, 7221 Lee Deforest Drive, Suite 300, Columbia, MD 21046, USA.
| | - Madhabi Majumdar
- Malvern Instruments, 7221 Lee Deforest Drive, Suite 300, Columbia, MD 21046, USA.
| | - E Neil Lewis
- Malvern Instruments, 7221 Lee Deforest Drive, Suite 300, Columbia, MD 21046, USA.
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Amin S, Blake S, Kennel RC, Lewis EN. Revealing New Structural Insights from Surfactant Micelles through DLS, Microrheology and Raman Spectroscopy. Materials 2015. [PMCID: PMC5455709 DOI: 10.3390/ma8063754] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The correlation between molecular changes and microstructural evolution of rheological properties has been demonstrated for the first time in a mixed anionic/zwitterionic surfactant-based wormlike micellar system. Utilizing a novel combination of DLS-microrheology and Raman Spectroscopy, the effect of electrostatic screening on these properties of anionic (SLES) and zwitterionic (CapB) surfactant mixtures was studied by modulating the NaCl concentration. As Raman Spectroscopy delivers information about the molecular structure and DLS-microrheology characterizes viscoelastic properties, the combination of data delivered allows for a deeper understanding of the molecular changes underlying the viscoelastic ones. The high frequency viscoelastic response obtained through DLS-microrheology has shown the persistence of the Maxwell fluid response for low viscosity solutions at high NaCl concentrations. The intensity of the Raman band at 170 cm−1 exhibits very strong correlation with the viscosity variation. As this Raman band is assigned to hydrogen bonding, its variation with NaCl concentration additionally indicates differences in water structuring due to potential microstructural differences at low and high NaCl concentrations. The microstructural differences at low and high NaCl concentrations are further corroborated by persistence of a slow mode at the higher NaCl concentrations as seen through DLS measurements. The study illustrates the utility of the combined DLS, DLS-optical microrheology and Raman Spectroscopy in providing new molecular structural insights into the self-assembly process in complex fluids.
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Affiliation(s)
- Samiul Amin
- Malvern Instruments, 7221 Lee Deforest Drive, Suite 300, Columbia, MD 21046, USA; E-Mails: (S.B.); (E.N.L.)
- Author to whom correspondence should be addressed; E-Mail: ; Tel.: +1-443-878-1325
| | - Steven Blake
- Malvern Instruments, 7221 Lee Deforest Drive, Suite 300, Columbia, MD 21046, USA; E-Mails: (S.B.); (E.N.L.)
| | - Rachel C. Kennel
- Chemical and Biomolecular Engineering, University of Delaware, 150 Academy St., Newark, DE 19716, USA; E-Mail:
| | - E. Neil Lewis
- Malvern Instruments, 7221 Lee Deforest Drive, Suite 300, Columbia, MD 21046, USA; E-Mails: (S.B.); (E.N.L.)
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Arumugam S, Xing A, Young T, Blake S, Thwaites D, Holloway L. SU-F-BRB-09: Measurement Based Dose-Volume Metrics for the Quality Assurance of VMAT Plans-Are We There Yet? Med Phys 2015. [DOI: 10.1118/1.4925204] [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: 11/07/2022] Open
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35
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Blake S, Hansen C, Deshpande S, Phan P, Franji I, Holloway L, Thwaites D. SU-E-T-370: Evaluating Plan Quality and Dose Delivery Accuracy of Tomotherapy SBRT Treatments for Lung Cancer. Med Phys 2015. [DOI: 10.1118/1.4924731] [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: 11/07/2022] Open
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36
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Blake S, Arumugam S, Holloway L, Vinod S, Ochoa C, Phan P, Thwaites D. EP-1442: Investigating the impact of treatment delivery uncertainties for lung SABR: a pilot study. Radiother Oncol 2015. [DOI: 10.1016/s0167-8140(15)41434-3] [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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37
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Amin S, Blake S, Kenyon SM, Kennel RC, Lewis EN. A novel combination of DLS-optical microrheology and low frequency Raman spectroscopy to reveal underlying biopolymer self-assembly and gelation mechanisms. J Chem Phys 2014; 141:234201. [DOI: 10.1063/1.4903785] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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38
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Lewis EN, Qi W, Kidder LH, Amin S, Kenyon SM, Blake S. Combined dynamic light scattering and Raman spectroscopy approach for characterizing the aggregation of therapeutic proteins. Molecules 2014; 19:20888-905. [PMID: 25514228 PMCID: PMC6271152 DOI: 10.3390/molecules191220888] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2014] [Revised: 12/02/2014] [Accepted: 12/05/2014] [Indexed: 11/16/2022] Open
Abstract
Determination of the physicochemical properties of protein therapeutics and their aggregates is critical for developing formulations that enhance product efficacy, stability, safety and manufacturability. Analytical challenges are compounded for materials: (1) that are formulated at high concentration, (2) that are formulated with a variety of excipients, and (3) that are available only in small volumes. In this article, a new instrument is described that measures protein secondary and tertiary structure, as well as molecular size, over a range of concentrations and formulation conditions of low volume samples. Specifically, characterization of colloidal and conformational stability is obtained through a combination of two well-established analytical techniques: dynamic light scattering (DLS) and Raman spectroscopy, respectively. As the data for these two analytical modalities are collected on the same sample at the same time, the technique enables direct correlation between them, in addition to the more straightforward benefit of minimizing sample usage by providing multiple analytical measurements on the same aliquot non-destructively. The ability to differentiate between unfolding and aggregation that the combination of these techniques provides enables insights into underlying protein aggregation mechanisms. The article will report on mechanistic insights for aggregation that have been obtained from the application of this technique to the characterization of lysozyme, which was evaluated as a function of concentration and pH.
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Affiliation(s)
- E Neil Lewis
- Malvern Biosciences Inc., 7221 Lee Deforest Drive, Suite 300, Columbia, MD 21046, USA.
| | - Wei Qi
- Malvern Biosciences Inc., 7221 Lee Deforest Drive, Suite 300, Columbia, MD 21046, USA.
| | - Linda H Kidder
- Malvern Biosciences Inc., 7221 Lee Deforest Drive, Suite 300, Columbia, MD 21046, USA.
| | - Samiul Amin
- Malvern Biosciences Inc., 7221 Lee Deforest Drive, Suite 300, Columbia, MD 21046, USA.
| | - Stacy M Kenyon
- Malvern Biosciences Inc., 7221 Lee Deforest Drive, Suite 300, Columbia, MD 21046, USA.
| | - Steven Blake
- Malvern Biosciences Inc., 7221 Lee Deforest Drive, Suite 300, Columbia, MD 21046, USA.
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39
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Blake S, Vial P, Holloway L, Kuncic Z. WE-E-18A-08: Towards a Next-Generation Electronic Portal Device for Simultaneous Imaging and Dose Verification in Radiotherapy. Med Phys 2014. [DOI: 10.1118/1.4889460] [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: 11/07/2022] Open
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40
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Blake S, Fletcher S, Stevens P, Velthuis J, Page R, Hugtenberg R. OC-0509: Early results for a novel IMRT verification system based on an upstream MAPS detector. Radiother Oncol 2014. [DOI: 10.1016/s0167-8140(15)30614-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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41
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Zhang J, Landry MP, Barone PW, Kim JH, Lin S, Ulissi ZW, Lin D, Mu B, Boghossian AA, Hilmer AJ, Rwei A, Hinckley AC, Kruss S, Shandell MA, Nair N, Blake S, Şen F, Şen S, Croy RG, Li D, Yum K, Ahn JH, Jin H, Heller DA, Essigmann JM, Blankschtein D, Strano MS. Molecular recognition using corona phase complexes made of synthetic polymers adsorbed on carbon nanotubes. Nat Nanotechnol 2013; 8:959-68. [PMID: 24270641 PMCID: PMC5051352 DOI: 10.1038/nnano.2013.236] [Citation(s) in RCA: 185] [Impact Index Per Article: 16.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/17/2012] [Accepted: 10/10/2013] [Indexed: 05/18/2023]
Abstract
Understanding molecular recognition is of fundamental importance in applications such as therapeutics, chemical catalysis and sensor design. The most common recognition motifs involve biological macromolecules such as antibodies and aptamers. The key to biorecognition consists of a unique three-dimensional structure formed by a folded and constrained bioheteropolymer that creates a binding pocket, or an interface, able to recognize a specific molecule. Here, we show that synthetic heteropolymers, once constrained onto a single-walled carbon nanotube by chemical adsorption, also form a new corona phase that exhibits highly selective recognition for specific molecules. To prove the generality of this phenomenon, we report three examples of heteropolymer-nanotube recognition complexes for riboflavin, L-thyroxine and oestradiol. In each case, the recognition was predicted using a two-dimensional thermodynamic model of surface interactions in which the dissociation constants can be tuned by perturbing the chemical structure of the heteropolymer. Moreover, these complexes can be used as new types of spatiotemporal sensors based on modulation of the carbon nanotube photoemission in the near-infrared, as we show by tracking riboflavin diffusion in murine macrophages.
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Affiliation(s)
- Jingqing Zhang
- 1] Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA [2]
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Creel S, Becker MS, Durant SM, M'Soka J, Matandiko W, Dickman AJ, Christianson D, Dröge E, Mweetwa T, Pettorelli N, Rosenblatt E, Schuette P, Woodroffe R, Bashir S, Beudels-Jamar RC, Blake S, Borner M, Breitenmoser C, Broekhuis F, Cozzi G, Davenport TRB, Deutsch J, Dollar L, Dolrenry S, Douglas-Hamilton I, Fitzherbert E, Foley C, Hazzah L, Henschel P, Hilborn R, Hopcraft JGC, Ikanda D, Jacobson A, Joubert B, Joubert D, Kelly MS, Lichtenfeld L, Mace GM, Milanzi J, Mitchell N, Msuha M, Muir R, Nyahongo J, Pimm S, Purchase G, Schenck C, Sillero-Zubiri C, Sinclair ARE, Songorwa AN, Stanley-Price M, Tehou CA, Trout C, Wall J, Wittemyer G, Zimmermann A. Conserving large populations of lions - the argument for fences has holes. Ecol Lett 2013; 16:1413, e1-3. [DOI: 10.1111/ele.12145] [Citation(s) in RCA: 61] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2013] [Revised: 06/03/2013] [Accepted: 06/04/2013] [Indexed: 11/27/2022]
Affiliation(s)
- S. Creel
- Department of Ecology; Conservation Biology and Ecology Program; Montana State University; 310 Lewis Hall Bozeman MT 59717 USA
| | - M. S. Becker
- Department of Ecology; Conservation Biology and Ecology Program; Montana State University; 310 Lewis Hall Bozeman MT 59717 USA
- Zambian Carnivore Programme; Box 80 Mfuwe Eastern Province Zambia
| | - S. M. Durant
- Institute of Zoology; Zoological Society of London; Regents Park London NW1 4RY UK
- Wildlife Conservation Society, Bronx Zoo; 2300 Southern Blvd. Bronx NY 10460 USA
| | - J. M'Soka
- Department of Ecology; Conservation Biology and Ecology Program; Montana State University; 310 Lewis Hall Bozeman MT 59717 USA
- Zambia Wildlife Authority; Private Bag 1 Chilanga Zambia
| | - W. Matandiko
- Department of Ecology; Conservation Biology and Ecology Program; Montana State University; 310 Lewis Hall Bozeman MT 59717 USA
- Zambian Carnivore Programme; Box 80 Mfuwe Eastern Province Zambia
| | - A. J. Dickman
- Wildlife Conservation Research Unit, Department of Zoology; The Recanati-Kaplan Centre; University of Oxford; Tubney House Tubney OX13 5QL UK
| | - D. Christianson
- School of Natural Resources and the Environment; University of Arizona; Tucson AZ 85721 USA
| | - E. Dröge
- Zambian Carnivore Programme; Box 80 Mfuwe Eastern Province Zambia
| | - T. Mweetwa
- Zambian Carnivore Programme; Box 80 Mfuwe Eastern Province Zambia
| | - N. Pettorelli
- Institute of Zoology; Zoological Society of London; Regents Park London NW1 4RY UK
| | - E. Rosenblatt
- Department of Ecology; Conservation Biology and Ecology Program; Montana State University; 310 Lewis Hall Bozeman MT 59717 USA
- Zambian Carnivore Programme; Box 80 Mfuwe Eastern Province Zambia
| | - P. Schuette
- Department of Ecology; Conservation Biology and Ecology Program; Montana State University; 310 Lewis Hall Bozeman MT 59717 USA
- Zambian Carnivore Programme; Box 80 Mfuwe Eastern Province Zambia
| | - R. Woodroffe
- Institute of Zoology; Zoological Society of London; Regents Park London NW1 4RY UK
| | - S. Bashir
- Institute of Zoology; Zoological Society of London; Regents Park London NW1 4RY UK
| | - R. C. Beudels-Jamar
- Royal Belgian Institute of Natural Sciences; 29 Vautier str. Bruxelles 1000 Belgium
- CMS Scientific Council, UNEP/CMS; Hermann-Ehlers-Str. 10 Bonn 53113 Germany
| | - S. Blake
- Max Planck Institute for Ornithology; Whitney R. Harris World Ecology Center; Washington University in St. Louis; St. Louis 63130 USA
| | - M. Borner
- Institute of Biodiversity, Animal Health and Comparative Medicine; University of Glasgow; University Avenue Glasgow G12 8QQ UK
| | - C. Breitenmoser
- IUCN/SSC Cat Specialist Group; c/o KORA, Thunstrasse 31 Muri 3074 Switzerland
| | - F. Broekhuis
- Wildlife Conservation Research Unit, Department of Zoology; The Recanati-Kaplan Centre; University of Oxford; Tubney House Tubney OX13 5QL UK
| | - G. Cozzi
- Institute of Evolutionary Biology and Environmental Studies; Zurich University; Winterthurerstrasse 190 Zürich CH 8057 Switzerland
| | - T. R. B. Davenport
- Wildlife Conservation Society, Tanzania Program; PO Box 922 Zanzibar Tanzania
| | - J. Deutsch
- Wildlife Conservation Society, Bronx Zoo; 2300 Southern Blvd. Bronx NY 10460 USA
| | - L. Dollar
- Big Cats Initiative, National Geographic Society; 1145 17th Street NW Washington DC 20036-4688 USA
- Nicholas School of the Environment; Duke University; Durham North Carolina USA
- Department of Biology; Pfeiffer University; Misenheimer North Carolina 28109 USA
| | - S. Dolrenry
- Lion Guardians; PO Box 15550 Langata 00509 Kenya
| | - I. Douglas-Hamilton
- Save the Elephants; PO Box 54667 Nairobi Kenya
- Department of Zoology; University of Oxford; Oxford OX1 3PS UK
| | - E. Fitzherbert
- Wildlife Conservation Research Unit, Department of Zoology; The Recanati-Kaplan Centre; University of Oxford; Tubney House Tubney OX13 5QL UK
- Chester Zoo; Chester CH2 1LH UK
| | - C. Foley
- Wildlife Conservation Society, Tanzania Program; PO Box 922 Zanzibar Tanzania
| | - L. Hazzah
- Lion Guardians; PO Box 15550 Langata 00509 Kenya
| | - P. Henschel
- Panthera; 8 West 40th Street, 18th Floor New York NY 10018 USA
| | - R. Hilborn
- School of Aquatic and Fishery Sciences; University of Washington; Seattle WA 98195 USA
| | - J. G. C. Hopcraft
- Institute of Biodiversity, Animal Health and Comparative Medicine; University of Glasgow; University Avenue Glasgow G12 8QQ UK
| | - D. Ikanda
- Tanzania Wildlife Research Institute; Box 661 Arusha Tanzania
| | - A. Jacobson
- Institute of Zoology; Zoological Society of London; Regents Park London NW1 4RY UK
| | - B. Joubert
- Big Cats Initiative, National Geographic Society; 1145 17th Street NW Washington DC 20036-4688 USA
| | - D. Joubert
- Big Cats Initiative, National Geographic Society; 1145 17th Street NW Washington DC 20036-4688 USA
| | - M. S. Kelly
- Department of Fish and Wildlife Conservation; Virginia Tech; 146 Cheatham Hall Blacksburg VA 24061-0321 USA
| | - L. Lichtenfeld
- African People & Wildlife Fund; PO Box 624 Bernardsville NJ 07924 USA
| | - G. M. Mace
- Department of Genetics, Evolution and Environment; Centre for Biodiversity and Environment Research; University College London; Gower Street London WC1E 6BT UK
| | - J. Milanzi
- Zambia Wildlife Authority; Private Bag 1 Chilanga Zambia
| | - N. Mitchell
- Wildlife Conservation Society, Bronx Zoo; 2300 Southern Blvd. Bronx NY 10460 USA
- Conservation Programmes, Zoological Society of London; Regents Park London NW1 4RY UK
| | - M. Msuha
- Tanzania Wildlife Research Institute; Box 661 Arusha Tanzania
| | - R. Muir
- Africa Programme, Frankfurt Zoological Society Africa Regional Office; Serengeti National Park; Serengeti Tanzania
| | | | - S. Pimm
- Nicholas School of the Environment; Duke University; Durham North Carolina USA
- Department of Biology; Pfeiffer University; Misenheimer North Carolina 28109 USA
| | - G. Purchase
- Wildlife Conservation Society, Bronx Zoo; 2300 Southern Blvd. Bronx NY 10460 USA
- Conservation Programmes, Zoological Society of London; Regents Park London NW1 4RY UK
| | - C. Schenck
- Frankfurt Zoological Society; Bernhard-Grzimek-Allee 1 Frankfurt 60316 Germany
| | - C. Sillero-Zubiri
- Department of Zoology; IUCN/SSC Canid Specialist Group Wildlife Conservation Research Unit; The Recanati-Kaplan Centre; University of Oxford; Tubney House Tubney OX13 5QL UK
| | - A. R. E. Sinclair
- Beaty Biodiversity Research Centre; University of British Columbia; 6270 University Boulevard Vancouver V6T 1Z4 Canada
| | | | - M. Stanley-Price
- Wildlife Conservation Research Unit, Department of Zoology; The Recanati-Kaplan Centre; University of Oxford; Tubney House Tubney OX13 5QL UK
- IUCN/SSC Species Conservation Planning Sub-committee; Rue Mauverney 28 1196 Gland Switzerland
| | - C. A. Tehou
- Coordonnateur WAP/UNOPS Bénin; B.P. 527 Cotonou, République Bénin
| | - C. Trout
- African People & Wildlife Fund; PO Box 624 Bernardsville NJ 07924 USA
| | - J. Wall
- Laboratory for Advanced Spatial Analysis; Department of Geography; University of British Columbia; 1984 West Mall Vancouver BC V6T 1Z2 Canada
| | - G. Wittemyer
- Fish, Wildlife and Conservation Biology; Colorado State University; Fort Collins Colorado 80523 USA
| | - A. Zimmermann
- Wildlife Conservation Research Unit, Department of Zoology; The Recanati-Kaplan Centre; University of Oxford; Tubney House Tubney OX13 5QL UK
- Chester Zoo; Chester CH2 1LH UK
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Legendre C, Cohen D, Delmas Y, Feldkamp T, Fouque D, Furman R, Gaber O, Greenbaum L, Goodship T, Haller H, Herthelius M, Hourmant M, Licht C, Moulin B, Sheerin N, Trivelli A, Bedrosian CL, Loirat C, Legendre C, Babu S, Cohen D, Delmas Y, Furman R, Gaber O, Greenbaum L, Hourmant M, Jungraithmayr T, Lebranchu Y, Riedl M, Sheerin N, Bedrosian CL, Loirat C, Sheerin N, Legendre C, Greenbaum L, Furman R, Cohen D, Gaber AO, Bedrosian C, Loirat C, Haller H, Licht C, Muus P, Legendre C, Douglas K, Hourmant M, Herthelius M, Trivelli A, Goodship T, Remuzzi G, Bedrosian C, Loirat C, Kourouklaris A, Ioannou K, Athanasiou I, Demetriou K, Panagidou A, Zavros M, Rodriguez C NY, Blasco M, Arcal C, Quintana LF, Rodriguez de Cordoba S, Campistol JM, Bachmann N, Eisenberger T, Decker C, Bolz HJ, Bergmann C, Pesce F, Cox SN, Serino G, De Palma G, Sallustio FP, Schena F, Falchi M, Pieri M, Stefanou C, Zaravinos A, Erguler K, Lapathitis G, Dweep H, Sticht C, Anastasiadou N, Zouvani I, Voskarides K, Gretz N, Deltas CC, Ruiz A, Bonny O, Sallustio F, Serino G, Curci C, Cox S, De Palma G, Schena F, Kemter E, Sklenak S, Aigner B, Wanke R, Kitzler TM, Moskowitz JL, Piret SE, Lhotta K, Tashman A, Velez E, Thakker RV, Kotanko P, Leierer J, Rudnicki M, Perco P, Koppelstaetter C, Mayer G, Sa MJN, Alves S, Storey H, Flinter F, Willems PJ, Carvalho F, Oliveira J, Arsali M, Papazachariou L, Demosthenous P, Lazarou A, Hadjigavriel M, Stavrou C, Yioukkas L, Voskarides K, Deltas C, Zavros M, Pierides A, Arsali M, Demosthenous P, Papazachariou L, Voskarides K, Kkolou M, Hadjigavriel M, Zavros M, Deltas C, Pierides A, Toka HR, Dibartolo S, Lanske B, Brown EM, Pollak MR, Familiari A, Zavan B, Sanna Cherchi S, Fabris A, Cristofaro R, Gambaro G, D'Angelo A, Anglani F, Toka H, Mount D, Pollak M, Curhan G, Sengoge G, Bajari T, Kupczok A, von Haeseler A, Schuster M, Pfaller W, Jennings P, Weltermann A, Blake S, Sunder-Plassmann G, Kerti A, Csohany R, Wagner L, Javorszky E, Maka E, Tulassay T, Tory K, Kingswood J, Nikolskaya N, Mbundi J, Kingswood J, Jozwiak S, Belousova E, Frost M, Kuperman R, Bebin M, Korf B, Flamini R, Kohrman M, Sparagana S, Wu J, Brechenmacher T, Stein K, Bissler J, Franz D, Kingswood J, Zonnenberg B, Frost M, Cheung W, Wang J, Brechenmacher T, Lam D, Bissler J, Budde K, Ivanitskiy L, Sowershaewa E, Krasnova T, Samokhodskaya L, Safarikova M, Jana R, Jitka S, Obeidova L, Kohoutova M, Tesar V, Evrengul H, Ertan P, Serdaroglu E, Yuksel S, Mir S, Yang n Ergon E, Berdeli A, Zawada A, Rogacev K, Rotter B, Winter P, Fliser D, Heine G, Bataille S, Moal V, Berland Y, Daniel L, Rosado C, Bueno E, Fraile P, Lucas C, Garcoa-Cosmes P, Tabernero JM, Gonzalez R, Rosado C, Bueno E, Fraile P, Lucas C, Garcia-Cosmes P, Tabernero JM, Gonzalez R, Silska-Dittmar M, Zaorska K, Malke A, Musielak A, Ostalska-Nowicka D, Zachwieja J, K d r V, Uz E, Yigit A, Altuntas A, Yigit B, Inal S, Uz E, Sezer M, Yilmaz R, Visciano B, Porto C, Acampora E, Russo R, Riccio E, Capuano I, Parenti G, Pisani A, Feriozzi S, Perrin A, West M, Nicholls K, Sunder-Plassmann G, Torras J, Cybulla M, Conti M, Angioi A, Floris M, Melis P, Asunis AM, Piras D, Pani A, Warnock D, Guasch A, Thomas C, Wanner C, Campbell R, Vujkovac B, Okur I, Biberoglu G, Ezgu F, Tumer L, Hasanoglu A, Bicik Z, Akin Y, Mumcuoglu M, Ecder T, Paliouras C, Mattas G, Papagiannis N, Ntetskas G, Lamprianou F, Karvouniaris N, Alivanis P. Genetic diseases and molecular genetics. Nephrol Dial Transplant 2013. [DOI: 10.1093/ndt/gft126] [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: 11/12/2022] Open
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Turner M, Seamark D, Milligan C, Thomas C, Brearley SG, Wang X, Blake S, Payne S. FAMILY CARERS' DELIVERY OF MEDICATIONS FOR THE PERSON DYING AT HOME: PRELIMINARY FINDINGS FROM THE ‘UNPACKING THE HOME’ STUDY. BMJ Support Palliat Care 2013. [DOI: 10.1136/bmjspcare-2013-000453a.5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Blake S, Vial P, Holloway L, McNamara A, Greer P, Kuncic Z. SU-E-I-109: Sensitivity Analysis of an Electronic Portal Imaging Device Monte Carlo Model to Variations in Optical Transport Parameters. Med Phys 2012; 39:3650. [DOI: 10.1118/1.4734826] [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: 11/07/2022] Open
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Turner M, Seamark D, Milligan C, Brearley S, Wang X, Blake S, Payne S. ‘Unpacking the home’ – a social science approach to researching dying at home. BMJ Support Palliat Care 2012. [DOI: 10.1136/bmjspcare-2012-000264.9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Vial P, Deshpande S, Blake S, McNamara A, Holloway L, Greer P, Kuncic Z. TH-C-BRA-11: First Experiments of a Prototype Device for Simultaneous Imaging and Dose Verification in Radiotherapy. Med Phys 2012. [DOI: 10.1118/1.4736327] [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: 11/07/2022] Open
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Dunn SS, Tian S, Blake S, Wang J, Galloway AL, Murphy A, Pohlhaus PD, Rolland JP, Napier ME, DeSimone JM. Reductively responsive siRNA-conjugated hydrogel nanoparticles for gene silencing. J Am Chem Soc 2012; 134:7423-30. [PMID: 22475061 PMCID: PMC3357068 DOI: 10.1021/ja300174v] [Citation(s) in RCA: 133] [Impact Index Per Article: 11.1] [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: 12/13/2022]
Abstract
A critical need still remains for effective delivery of RNA interference (RNAi) therapeutics to target tissues and cells. Self-assembled lipid- and polymer-based systems have been most extensively explored for transfection with small interfering RNA (siRNA) in liver and cancer therapies. Safety and compatibility of materials implemented in delivery systems must be ensured to maximize therapeutic indices. Hydrogel nanoparticles of defined dimensions and compositions, prepared via a particle molding process that is a unique off-shoot of soft lithography known as particle replication in nonwetting templates (PRINT), were explored in these studies as delivery vectors. Initially, siRNA was encapsulated in particles through electrostatic association and physical entrapment. Dose-dependent gene silencing was elicited by PEGylated hydrogels at low siRNA doses without cytotoxicity. To prevent disassociation of cargo from particles after systemic administration or during postfabrication processing for surface functionalization, a polymerizable siRNA pro-drug conjugate with a degradable, disulfide linkage was prepared. Triggered release of siRNA from the pro-drug hydrogels was observed under a reducing environment while cargo retention and integrity were maintained under physiological conditions. Gene silencing efficiency and cytocompatibility were optimized by screening the amine content of the particles. When appropriate control siRNA cargos were loaded into hydrogels, gene knockdown was only encountered for hydrogels containing releasable, target-specific siRNAs, accompanied by minimal cell death. Further investigation into shape, size, and surface decoration of siRNA-conjugated hydrogels should enable efficacious targeted in vivo RNAi therapies.
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Affiliation(s)
- Stuart S. Dunn
- Department of Chemistry, University of North Carolina, Chapel Hill, NC 27599
| | - Shaomin Tian
- Department of Chemistry, University of North Carolina, Chapel Hill, NC 27599
- Carolina Center of Cancer Nanotechnology Excellence, University of North Carolina, Chapel Hill, NC 27599
- Lineberger Comprehensive Cancer Center, University of North Carolina, Chapel Hill, NC 27599
| | - Steven Blake
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02319
| | - Jin Wang
- Department of Pharmacology, Baylor College of Medicine, Houston, Texas 77030
| | | | - Andrew Murphy
- Liquidia Technologies, Research Triangle Park, NC 22709
| | | | | | - Mary E. Napier
- Department of Chemistry, University of North Carolina, Chapel Hill, NC 27599
- Carolina Center of Cancer Nanotechnology Excellence, University of North Carolina, Chapel Hill, NC 27599
- Lineberger Comprehensive Cancer Center, University of North Carolina, Chapel Hill, NC 27599
- Department of Biochemistry and Biophysics, University of North Carolina, Chapel Hill, NC 27599
| | - Joseph M. DeSimone
- Department of Chemistry, University of North Carolina, Chapel Hill, NC 27599
- Carolina Center of Cancer Nanotechnology Excellence, University of North Carolina, Chapel Hill, NC 27599
- Lineberger Comprehensive Cancer Center, University of North Carolina, Chapel Hill, NC 27599
- Department of Pharmacology, University of North Carolina, Chapel Hill, NC 27599
- Eshelman School of Pharmacy, University of North Carolina, Chapel Hill, NC 27599
- Institute for Advanced Materials, University of North Carolina, Chapel Hill, NC 27599
- Institute for Nanomedicine, University of North Carolina, Chapel Hill, NC 27599
- Department of Chemical and Biomolecular Engineering, North Carolina State University, Raleigh, NC 27695
- Sloan-Kettering Institute for Cancer Research, Memorial Sloan-Kettering Cancer Center, New York, NY 10021
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Blake S, Vial P, Holloway L, Greer P, Kuncic Z. SU-F-BRA-02: An Investigation Into Optical Photon Transport Effects on Electronic Portal Imaging Performance Using Geant4. Med Phys 2011. [DOI: 10.1118/1.3612869] [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: 11/07/2022] Open
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Rokitskaya TI, Macrae MX, Blake S, Egorova NS, Kotova EA, Yang J, Antonenko YN. Mechanistic insight into gramicidin-based detection of protein-ligand interactions via sensitized photoinactivation. J Phys Condens Matter 2010; 22:454118. [PMID: 21339605 DOI: 10.1088/0953-8984/22/45/454118] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Among the many challenges for the development of ion channel-based sensors is the poor understanding of how to engineer modified transmembrane pores with tailored functionality that can respond to external stimuli. Here, we use the method of sensitized photoinactivation of gramicidin A (gA) channels in planar bilayer lipid membranes to help elucidate the underlying mechanistic details for changes in macroscopic transmembrane ionic current observed upon interaction of C-terminally attached gA ligands with specific proteins in solution. Three different systems were studied: (i) carbonic anhydrase (CA) and gA-sulfonamide, (ii) PSD-95 protein (belonging to the 'PDZ domain-containing protein') and a gA analog carrying the KGGHRRSARYLESSV peptide sequence at the C-terminus, and (iii) an anti-biotin antibody and gA-biotin. The results challenge a previously proposed mechanistic hypothesis suggesting that protein-induced current suppression is due to steric blockage of the ion passage through gA channels, while they reveal new insight for consideration in alternative mechanistic models. Additionally, we demonstrate that the length of a linker between the ligand and the gA channel may be less important for gramicidin-based detection of monovalent compared to multivalent protein-ligand interactions. These studies collectively shed new light on the mechanism of protein-induced current alterations in bilayer recordings of gA derivatives, which may be important in the design of new gramicidin-based sensors.
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Affiliation(s)
- Tatyana I Rokitskaya
- Belozersky Institute of Physico-Chemical Biology, Moscow State University, Moscow 119991, Russia
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