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Nene RV, Corbett B, Lambert G, Smith AM, LaFree A, Steinberg JA, Costantini TW. Identification and management of low-risk isolated traumatic brain injury patients initially treated at a rural level IV trauma center. Am J Emerg Med 2024; 78:127-131. [PMID: 38266433 DOI: 10.1016/j.ajem.2024.01.014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2023] [Revised: 12/14/2023] [Accepted: 01/07/2024] [Indexed: 01/26/2024] Open
Abstract
STUDY OBJECTIVE Our goal was to determine if low-risk, isolated mild traumatic brain injury (TBI) patients who were initially treated at a rural emergency department may have been safely managed without transfer to the tertiary referral trauma center. METHODS This was a retrospective observational analysis of isolated mild TBI patients who were transferred from a rural Level IV Trauma Center to a regional Level I Trauma Center between 2018 and 2022. Patients were risk-stratified according to the modified Brain Injury Guidelines (mBIG). Data abstracted from the electronic medical record included patient presentation, management, and outcomes. RESULTS 250 patients with isolated mild TBI were transferred out to the Level I Trauma Center. Fall was the most common mechanism of injury (69.2%). 28 patients (11.2%) were categorized as low-risk (mBIG1). No mBIG1 patients suffered a progression of neurological injury, had worsening of intracranial hemorrhage on repeat head CT, or required neurosurgical intervention. 12/28 (42.9%) of mBIG1 patients had a hospital length of stay of 2 days or less, typically for observation. Those with longer lengths of stay were due to medical complications, such as sepsis, or difficulty in arranging disposition. CONCLUSION We propose that patients who meet mBIG1 criteria may be safely observed without transfer to a referral Level I Trauma Center. This would be of considerable benefit to patients, who would not need to leave their community, and would improve resource utilization in the region.
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Affiliation(s)
- Rahul V Nene
- Department of Emergency Medicine, University of California, San Diego, San Diego, CA, USA; Department of Emergency Medicine, El Centro Regional Medical Center, El Centro, CA, USA.
| | - Bryan Corbett
- Department of Emergency Medicine, University of California, San Diego, San Diego, CA, USA; Department of Emergency Medicine, El Centro Regional Medical Center, El Centro, CA, USA.
| | - Gage Lambert
- Department of Neurosurgery, University of California, San Diego, San Diego, CA, USA.
| | - Alan M Smith
- Department of Surgery, Division of Trauma, Surgical Critical Care, Burns, and Acute Care Surgery, UC San Diego, San Diego, CA, USA.
| | - Andrew LaFree
- Department of Emergency Medicine, University of California, San Diego, San Diego, CA, USA.
| | - Jeffrey A Steinberg
- Department of Neurosurgery, University of California, San Diego, San Diego, CA, USA.
| | - Todd W Costantini
- Department of Surgery, Division of Trauma, Surgical Critical Care, Burns, and Acute Care Surgery, UC San Diego, San Diego, CA, USA.
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2
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Almeida MV, Blumer M, Yuan CU, Sierra P, Price JL, Quah FX, Friman A, Dallaire A, Vernaz G, Putman ALK, Smith AM, Joyce DA, Butter F, Haase AD, Durbin R, Santos ME, Miska EA. Dynamic co-evolution of transposable elements and the piRNA pathway in African cichlid fishes. bioRxiv 2024:2024.04.01.587621. [PMID: 38617250 PMCID: PMC11014572 DOI: 10.1101/2024.04.01.587621] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/16/2024]
Abstract
East African cichlid fishes have diversified in an explosive fashion, but the (epi)genetic basis of the phenotypic diversity of these fishes remains largely unknown. Although transposable elements (TEs) have been associated with phenotypic variation in cichlids, little is known about their transcriptional activity and epigenetic silencing. Here, we describe dynamic patterns of TE expression in African cichlid gonads and during early development. Orthology inference revealed an expansion of piwil1 genes in Lake Malawi cichlids, likely driven by PiggyBac TEs. The expanded piwil1 copies have signatures of positive selection and retain amino acid residues essential for catalytic activity. Furthermore, the gonads of African cichlids express a Piwi-interacting RNA (piRNA) pathway that target TEs. We define the genomic sites of piRNA production in African cichlids and find divergence in closely related species, in line with fast evolution of piRNA-producing loci. Our findings suggest dynamic co-evolution of TEs and host silencing pathways in the African cichlid radiations. We propose that this co-evolution has contributed to cichlid genomic diversity.
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Affiliation(s)
- Miguel Vasconcelos Almeida
- Department of Biochemistry, University of Cambridge, Tennis Court Road, Cambridge, CB2 1GA, UK
- Wellcome/CRUK Gurdon Institute, University of Cambridge, Tennis Court Road, Cambridge, CB2 1QN, UK
| | - Moritz Blumer
- Department of Genetics, University of Cambridge, Downing Street, Cambridge, CB2 3EH, UK
- These authors contributed equally
| | - Chengwei Ulrika Yuan
- Department of Biochemistry, University of Cambridge, Tennis Court Road, Cambridge, CB2 1GA, UK
- Wellcome/CRUK Gurdon Institute, University of Cambridge, Tennis Court Road, Cambridge, CB2 1QN, UK
- Department of Genetics, University of Cambridge, Downing Street, Cambridge, CB2 3EH, UK
- These authors contributed equally
| | - Pío Sierra
- Department of Genetics, University of Cambridge, Downing Street, Cambridge, CB2 3EH, UK
| | - Jonathan L. Price
- Department of Biochemistry, University of Cambridge, Tennis Court Road, Cambridge, CB2 1GA, UK
- Wellcome/CRUK Gurdon Institute, University of Cambridge, Tennis Court Road, Cambridge, CB2 1QN, UK
| | - Fu Xiang Quah
- Department of Biochemistry, University of Cambridge, Tennis Court Road, Cambridge, CB2 1GA, UK
- Department of Genetics, University of Cambridge, Downing Street, Cambridge, CB2 3EH, UK
| | - Aleksandr Friman
- National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD 20892, USA
- Biophysics Graduate Program, Institute for Physical Science and Technology, University of Maryland, College Park, Maryland 20742, USA
| | - Alexandra Dallaire
- Department of Biochemistry, University of Cambridge, Tennis Court Road, Cambridge, CB2 1GA, UK
- Wellcome/CRUK Gurdon Institute, University of Cambridge, Tennis Court Road, Cambridge, CB2 1QN, UK
- Comparative Fungal Biology, Royal Botanic Gardens Kew, Jodrell Laboratory, Richmond TW9 3DS, UK
| | - Grégoire Vernaz
- Wellcome/CRUK Gurdon Institute, University of Cambridge, Tennis Court Road, Cambridge, CB2 1QN, UK
- Department of Genetics, University of Cambridge, Downing Street, Cambridge, CB2 3EH, UK
- Present address: Zoological Institute, Department of Environmental Sciences, University of Basel, Vesalgasse 1, Basel, 4051, Switzerland
| | - Audrey L. K. Putman
- Department of Biochemistry, University of Cambridge, Tennis Court Road, Cambridge, CB2 1GA, UK
- Wellcome/CRUK Gurdon Institute, University of Cambridge, Tennis Court Road, Cambridge, CB2 1QN, UK
- Department of Genetics, University of Cambridge, Downing Street, Cambridge, CB2 3EH, UK
| | - Alan M. Smith
- School of Natural Sciences, University of Hull, Hull, HU6 7RX, UK
| | - Domino A. Joyce
- School of Natural Sciences, University of Hull, Hull, HU6 7RX, UK
| | - Falk Butter
- Institute of Molecular Biology (IMB), Quantitative Proteomics, Ackermannweg 4, Mainz, 55128, Germany
- Institute of Molecular Virology and Cell Biology, Friedrich-Loeffler-Institute, Südufer, Greifswald, 17493, Germany
| | - Astrid D. Haase
- National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD 20892, USA
| | - Richard Durbin
- Department of Genetics, University of Cambridge, Downing Street, Cambridge, CB2 3EH, UK
- Wellcome Sanger Institute, Tree of Life, Wellcome Genome Campus, Hinxton, CB10 1SA, UK
| | - M. Emília Santos
- Department of Zoology, University of Cambridge, Downing Street, Cambridge, CB2 3EJ, UK
| | - Eric A. Miska
- Department of Biochemistry, University of Cambridge, Tennis Court Road, Cambridge, CB2 1GA, UK
- Wellcome/CRUK Gurdon Institute, University of Cambridge, Tennis Court Road, Cambridge, CB2 1QN, UK
- Wellcome Sanger Institute, Tree of Life, Wellcome Genome Campus, Hinxton, CB10 1SA, UK
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3
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Edgley DE, Carruthers M, Gabagambi NP, Saxon AD, Smith AM, Joyce DA, Vernaz G, Santos ME, Turner GF, Genner MJ. Lateral line system diversification during the early stages of ecological speciation in cichlid fish. BMC Ecol Evol 2024; 24:24. [PMID: 38378480 PMCID: PMC10877828 DOI: 10.1186/s12862-024-02214-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2023] [Accepted: 02/09/2024] [Indexed: 02/22/2024] Open
Abstract
BACKGROUND The mechanosensory lateral line system is an important sensory modality in fishes, informing multiple behaviours related to survival including finding food and navigating in dark environments. Given its ecological importance, we may expect lateral line morphology to be under disruptive selection early in the ecological speciation process. Here we quantify the lateral line system morphology of two ecomorphs of the cichlid fish Astatotilapia calliptera in crater Lake Masoko that have diverged from common ancestry within the past 1,000 years. RESULTS Based on geometric morphometric analyses of CT scans, we show that the zooplanktivorous benthic ecomorph that dominates the deeper waters of the lake has large cranial lateral line canal pores, relative to those of the nearshore invertebrate-feeding littoral ecomorph found in the shallower waters. In contrast, fluorescence imaging revealed no evidence for divergence between ecomorphs in the number of either superficial or canal neuromasts. We illustrate the magnitude of the variation we observe in Lake Masoko A. calliptera in the context of the neighbouring Lake Malawi mega-radiation that comprises over 700 species. CONCLUSIONS These results provide the first evidence of divergence in this often-overlooked sensory modality in the early stages of ecological speciation, suggesting that it may have a role in the broader adaptive radiation process.
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Affiliation(s)
- Duncan E Edgley
- School of Biological Sciences, University of Bristol, Bristol, UK.
| | - Madeleine Carruthers
- School of Biological Sciences, University of Bristol, Bristol, UK
- School of Biological and Behavioural Sciences, Queen Mary University of London, London, UK
| | - Nestory P Gabagambi
- Tanzania Fisheries Research Institute, Kyela Centre, P.O. Box 98, Kyela, Mbeya, Tanzania
| | - Andrew D Saxon
- School of Biological Sciences, University of Bristol, Bristol, UK
| | - Alan M Smith
- School of Natural Sciences, University of Hull, Hull, UK
| | - Domino A Joyce
- School of Natural Sciences, University of Hull, Hull, UK
| | - Grégoire Vernaz
- Department of Genetics, University of Cambridge, Downing Street, Cambridge, UK
- Wellcome/Cancer Research UK, Gurdon Institute, University of Cambridge, Cambridge, UK
| | - M Emília Santos
- Department of Zoology, University of Cambridge, Cambridge, UK
| | | | - Martin J Genner
- School of Biological Sciences, University of Bristol, Bristol, UK.
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4
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Perkins L, Adams L, Lerner D, Santorelli J, Smith AM, Kobayashi L. Predictors of direct oral anticoagulant concentrations in the trauma population. Trauma Surg Acute Care Open 2024; 9:e001208. [PMID: 38274020 PMCID: PMC10806470 DOI: 10.1136/tsaco-2023-001208] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2024] Open
Abstract
Introduction Direct oral anticoagulant (DOAC) use is becoming more prevalent in patients presenting after trauma. We sought to identify the prevalence and predictors of subtherapeutic and therapeutic DOAC concentrations and hypothesized that increased anti-Xa levels would correlate with increased risk of bleeding and other poor outcomes. Methods A retrospective cohort study of all trauma patients on apixaban or rivaroxaban admitted to a level 1 trauma center between January 2015 and July 2021 was performed. Patients were excluded if they did not have a DOAC-specific anti-Xa level at presentation. Therapeutic levels were defined as an anti-Xa of 50 ng/mL to 250 ng/mL for rivaroxaban and 75 ng/mL to 250 ng/mL for apixaban. Linear regression was used to identify correlations between study variables and anti-Xa level, and binomial logistic regression was used to test the association of anti-Xa level with outcomes. Results There were 364 trauma patients admitted during the study period who were documented to be on apixaban or rivaroxaban. Of these, 245 patients had anti-Xa levels measured at admission. The population was 53% woman, with median age of 78 years, and median Injury Severity Score of 5. In total, 39% of patients had therapeutic and 20% had supratherapeutic anti-Xa levels. Female sex, increased age, decreased height and weight, and lower estimated creatinine clearance were associated with higher anti-Xa levels at admission. There was no correlation between anti-Xa level and the need for transfusion or reversal agent administration, admission diagnosis of intracranial hemorrhage (ICH), progression of ICH, hospital length of stay, or mortality. Conclusions Anti-Xa levels in trauma patients on DOACs vary widely; female patients who are older, smaller, and have decreased kidney function present with higher DOAC-specific anti-Xa levels after trauma. We were unable to detect an association between anti-Xa levels and clinical outcomes. Level of evidence III-Prognostic and Epidemiological.
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Affiliation(s)
- Louis Perkins
- Department of Surgery, Division of Trauma, Surgical Critical Care, Burns and Acute Care Surgery, University of California San Diego, San Diego, California, USA
| | - Laura Adams
- Department of Surgery, Division of Trauma, Surgical Critical Care, Burns and Acute Care Surgery, University of California San Diego, San Diego, California, USA
| | - Dmitri Lerner
- Department of Pharmacy, University of California San Diego, San Diego, California, USA
| | - Jarrett Santorelli
- Department of Surgery, Division of Trauma, Surgical Critical Care, Burns and Acute Care Surgery, University of California San Diego, San Diego, California, USA
| | - Alan M Smith
- Department of Surgery, Division of Trauma, Surgical Critical Care, Burns and Acute Care Surgery, University of California San Diego, San Diego, California, USA
| | - Leslie Kobayashi
- Department of Surgery, Division of Trauma, Surgical Critical Care, Burns and Acute Care Surgery, University of California San Diego, San Diego, California, USA
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5
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Smith AM, Donley ELR, Ney DM, Amaral DG, Burrier RE, Natowicz MR. Metabolomic biomarkers in autism: identification of complex dysregulations of cellular bioenergetics. Front Psychiatry 2023; 14:1249578. [PMID: 37928922 PMCID: PMC10622772 DOI: 10.3389/fpsyt.2023.1249578] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/28/2023] [Accepted: 08/30/2023] [Indexed: 11/07/2023] Open
Abstract
Autism Spectrum Disorder (ASD or autism) is a phenotypically and etiologically heterogeneous condition. Identifying biomarkers of clinically significant metabolic subtypes of autism could improve understanding of its underlying pathophysiology and potentially lead to more targeted interventions. We hypothesized that the application of metabolite-based biomarker techniques using decision thresholds derived from quantitative measurements could identify autism-associated subpopulations. Metabolomic profiling was carried out in a case-control study of 499 autistic and 209 typically developing (TYP) children, ages 18-48 months, enrolled in the Children's Autism Metabolome Project (CAMP; ClinicalTrials.gov Identifier: NCT02548442). Fifty-four metabolites, associated with amino acid, organic acid, acylcarnitine and purine metabolism as well as microbiome-associated metabolites, were quantified using liquid chromatography-tandem mass spectrometry. Using quantitative thresholds, the concentrations of 4 metabolites and 149 ratios of metabolites were identified as biomarkers, each identifying subpopulations of 4.5-11% of the CAMP autistic population. A subset of 42 biomarkers could identify CAMP autistic individuals with 72% sensitivity and 90% specificity. Many participants were identified by several metabolic biomarkers. Using hierarchical clustering, 30 clusters of biomarkers were created based on participants' biomarker profiles. Metabolic changes associated with the clusters suggest that altered regulation of cellular metabolism, especially of mitochondrial bioenergetics, were common metabolic phenotypes in this cohort of autistic participants. Autism severity and cognitive and developmental impairment were associated with increased lactate, many lactate containing ratios, and the number of biomarker clusters a participant displayed. These studies provide evidence that metabolic phenotyping is feasible and that defined autistic subgroups can lead to enhanced understanding of the underlying pathophysiology and potentially suggest pathways for targeted metabolic treatments.
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Affiliation(s)
- Alan M. Smith
- Stemina Biomarker Discovery, Inc, Madison, WI, United States
| | | | - Denise M. Ney
- Department of Nutritional Sciences, University of Wisconsin-Madison, Madison, WI, United States
| | - David G. Amaral
- Department of Psychiatry and Behavioral Sciences, The MIND Institute, University of California, Davis, Davis, CA, United States
| | | | - Marvin R. Natowicz
- Pathology and Laboratory Medicine, Genomic Medicine, Neurological and Pediatrics Institutes, Cleveland Clinic, Cleveland, OH, United States
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6
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Moakes RJA, Senior JJ, Robinson TE, Chipara M, Atanasov A, Naylor A, Metcalfe AD, Smith AM, Grover LM. Publisher's Note: “A suspended layer additive manufacturing approach to the bioprinting of tri-layered skin equivalents” [APL Bioeng. 5, 046103 (2021)]. APL Bioeng 2023; 7:029901. [PMID: 37035542 PMCID: PMC10076063 DOI: 10.1063/5.0151285] [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] [Received: 03/14/2023] [Indexed: 04/05/2023] Open
Abstract
[This corrects the article DOI: 10.1063/5.0061361.].
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Affiliation(s)
- Richard J. A. Moakes
- School of Chemical Engineering, University of Birmingham, Birmingham B15 2TT, United Kingdom
| | - Jessica J. Senior
- Department of Pharmacy, University of Huddersfield, Queensgate, Huddersfield HD1 3DH, United Kingdom
| | - Thomas E. Robinson
- School of Chemical Engineering, University of Birmingham, Birmingham B15 2TT, United Kingdom
| | - Miruna Chipara
- School of Chemical Engineering, University of Birmingham, Birmingham B15 2TT, United Kingdom
| | - Aleksandar Atanasov
- School of Chemical Engineering, University of Birmingham, Birmingham B15 2TT, United Kingdom
| | - Amy Naylor
- Inflammation and Ageing, University of Birmingham, Birmingham B15 2TT, United Kingdom
| | - Anthony D. Metcalfe
- School of Chemical Engineering, University of Birmingham, Birmingham B15 2TT, United Kingdom
| | - Alan M. Smith
- Department of Pharmacy, University of Huddersfield, Queensgate, Huddersfield HD1 3DH, United Kingdom
| | - Liam M. Grover
- School of Chemical Engineering, University of Birmingham, Birmingham B15 2TT, United Kingdom
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7
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Senior JJ, Moakes RJA, Cooke ME, Moxon SR, Smith AM, Grover LM. Agarose Fluid Gels Formed by Shear Processing During Gelation for Suspended 3D Bioprinting. J Vis Exp 2023. [PMID: 37306451 DOI: 10.3791/64458] [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: 06/13/2023] Open
Abstract
The use of granular matrices to support parts during the bioprinting process was first reported by Bhattacharjee et al. in 2015, and since then, several approaches have been developed for the preparation and use of supporting gel beds in 3D bioprinting. This paper describes a process to manufacture microgel suspensions using agarose (known as fluid gels), wherein particle formation is governed by the application of shear during gelation. Such processing produces carefully defined microstructures, with subsequent material properties that impart distinct advantages as embedding print media, both chemically and mechanically. These include behaving as viscoelastic solid-like materials at zero shear, limiting long-range diffusion, and demonstrating the characteristic shear-thinning behavior of flocculated systems. On the removal of shear stress, however, fluid gels have the capacity to rapidly recover their elastic properties. This lack of hysteresis is directly linked to the defined microstructures previously alluded to; because of the processing, reactive, non-gelled polymer chains at the particle interface facilitate interparticle interactions-similar to a Velcro effect. This rapid recovery of elastic properties enables bioprinting high-resolution parts from low-viscosity biomaterials, as rapid reformation of the support bed traps the bioink in situ, maintaining its shape. Furthermore, an advantage of agarose fluid gels is the asymmetric gelling/melting transitions (gelation temperature of ~30 °C and melting temperature of ~90 °C). This thermal hysteresis of agarose makes it possible to print and culture the bioprinted part in situ without the supporting fluid gel melting. This protocol shows how to manufacture agarose fluid gels and demonstrates their use to support the production of a range of complex hydrogel parts within suspended-layer additive manufacture (SLAM).
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Affiliation(s)
| | | | - Megan E Cooke
- Chemical and Biological Engineering, University of Colorado Boulder
| | | | - Alan M Smith
- Department of Pharmacy, University of Huddersfield;
| | - Liam M Grover
- School of Chemical Engineering, University of Birmingham;
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8
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Dunbar C, Santorelli JE, Marshall WA, Haines LN, Box K, Lee JG, Strait E, Costantini TW, Smith AM, Doucet JJ, Berndtson AE. Cross-Border Antibiotic Resistance Patterns in Burn Patients. Surg Infect (Larchmt) 2023; 24:327-334. [PMID: 37036781 DOI: 10.1089/sur.2022.313] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/11/2023] Open
Abstract
Background: Antimicrobial resistance (AMR) is a growing problem worldwide, with differences in regional resistance patterns partially driven by local variance in antibiotic stewardship. Trauma patients transferring from Mexico have more AMR than those injured in the United States; we hypothesized a similar pattern would be present for burn patients. Patients and Methods: The registry of an American Burn Association (ABA)-verified burn center was queried for all admissions for burn injury January 2015 through December 2019 with hospital length-of-stay (LOS) longer than seven days. Patients were divided into two groups based upon burn location: United States (USA) or Mexico (MEX). All bacterial infections were analyzed. Results: A total of 73 MEX and 826 USA patients were included. Patients had a similar mean age (40.4 years MEX vs. 42.2 USA) and gender distribution (69.6% male vs. 64.4%). The MEX patients had larger median percent total body surface area burned (%TBSA; 11.1% vs. 4.3%; p ≤ 0.001) and longer hospital LOS (18.0 vs. 13.0 days; p = 0.028). The MEX patients more often had respiratory infections (16.4% vs. 7.4%; p = 0.046), whereas rates of other infections were similar. The MEX patients had higher rates of any resistant organism (47.2% of organisms MEX vs. 28.1% USA; p = 0.013), and were more likely to have resistant infections on univariable analysis; however, on multivariable analysis country of burn was no longer significant. Conclusions: Antimicrobial resistance is more common in burn patients initially burned in Mexico than those burned in the United States, but location was not a predictor of resistance compared to other traditional burn-related factors. Continuing to monitor for AMR regardless of country of burn remains critical.
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Affiliation(s)
- Chance Dunbar
- School of Medicine, UC San Diego, San Diego, California, USA
| | - Jarrett E Santorelli
- Division of Trauma, Surgical Critical Care, Burns, and Acute Care Surgery, Department of Surgery, UC San Diego, San Diego, California, USA
| | - William A Marshall
- Division of Trauma, Surgical Critical Care, Burns, and Acute Care Surgery, Department of Surgery, UC San Diego, San Diego, California, USA
| | - Laura N Haines
- Division of Trauma, Surgical Critical Care, Burns, and Acute Care Surgery, Department of Surgery, UC San Diego, San Diego, California, USA
| | - Kevin Box
- Department of Pharmacology, UC San Diego, San Diego, California, USA
| | - Jeanne G Lee
- Division of Trauma, Surgical Critical Care, Burns, and Acute Care Surgery, Department of Surgery, UC San Diego, San Diego, California, USA
| | - Eli Strait
- Division of Trauma, Surgical Critical Care, Burns, and Acute Care Surgery, Department of Surgery, UC San Diego, San Diego, California, USA
| | - Todd W Costantini
- Division of Trauma, Surgical Critical Care, Burns, and Acute Care Surgery, Department of Surgery, UC San Diego, San Diego, California, USA
| | - Alan M Smith
- Division of Trauma, Surgical Critical Care, Burns, and Acute Care Surgery, Department of Surgery, UC San Diego, San Diego, California, USA
| | - Jay J Doucet
- Division of Trauma, Surgical Critical Care, Burns, and Acute Care Surgery, Department of Surgery, UC San Diego, San Diego, California, USA
| | - Allison E Berndtson
- Division of Trauma, Surgical Critical Care, Burns, and Acute Care Surgery, Department of Surgery, UC San Diego, San Diego, California, USA
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9
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White LJ, Rose M, Lawson M, Joyce D, Smith AM, Thomas GH, Dasmahapatra KK, Pownall ME. Two closely related ureotelic fish species of the genus Alcolapia express different levels of ammonium transporters in gills. Biol Open 2022; 11:277826. [PMID: 36250323 DOI: 10.1242/bio.059575] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2022] [Accepted: 10/10/2022] [Indexed: 11/20/2022] Open
Abstract
Most fish excrete their nitrogenous waste across the gills as ammonia through the activity of the Rhesus glycoprotein ammonium transporters. In contrast, fish of the subgenus Alcolapia (Oreochromis) are the only vertebrates that survive the extreme conditions of the soda lakes of Natron and Magadi in East Africa and have evolved adaptations to the highly alkaline waters including the ability to excrete their nitrogenous waste as urea. Nevertheless, Alcolapia retain the Rhesus glycoprotein genes in their genomes and using two heterologous expression systems, we demonstrate that Alcolapia Rhbg is capable of moving ammonia. Comparing ammonia and urea excretion from two closely related Alcolapia species from the same aquarium, we found that while Alcolapia grahami remains fully ureotelic after many generations in lab conditions, Alcolapia alcalica excretes some of its nitrogenous waste as ammonia. Using in situ hybridisation, we demonstrate robust, localised gene expression of Rhbg, rhcg1 and rhcg2 in the gill tissue in both A. alcalica embryos and adults, similar to that in other ammoniotelic fish. In contrast, the expression of these genes in A. grahami gills is much lower than in A. alcalica, suggesting the rapid evolution of a molecular mechanism underlying the complete ureotelism of A. grahami.
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Affiliation(s)
- Lewis J White
- Department of Biology, University of York, York, YO10 5DD, UK
| | - Matthew Rose
- Department of Biology, University of York, York, YO10 5DD, UK
| | - Michael Lawson
- Department of Biology, University of York, York, YO10 5DD, UK
| | - Domino Joyce
- Department of Biological and Marine Sciences, Faculty of Science and Engineering, University of Hull, Hull, HU6 7RX, UK
| | - Alan M Smith
- Department of Biological and Marine Sciences, Faculty of Science and Engineering, University of Hull, Hull, HU6 7RX, UK
| | - Gavin H Thomas
- Department of Biology, University of York, York, YO10 5DD, UK
| | | | - Mary E Pownall
- Department of Biology, University of York, York, YO10 5DD, UK
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10
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Berndtson AE, Costantini TW, Smith AM, Edwards SB, Kobayashi L, Doucet JJ, Godat LN. Management of choledocholithiasis in the elderly: Same-admission cholecystectomy remains the standard of care. Surgery 2022; 172:1057-1064. [PMID: 35989133 DOI: 10.1016/j.surg.2022.06.008] [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] [Received: 12/22/2021] [Revised: 06/03/2022] [Accepted: 06/08/2022] [Indexed: 11/24/2022]
Abstract
BACKGROUND Current guidelines recommend that patients with choledocholithiasis undergo same-admission cholecystectomy. The compliance with this guideline is poor in elderly patients. We hypothesized that elderly patients treated with endoscopic retrograde cholangiopancreatography (ERCP) alone would have higher complication and readmission rates than the patients treated with cholecystectomy. METHODS The Nationwide Readmissions Database was queried for all patients aged ≥65 years with admission for choledocholithiasis January to June 2016. The patients were divided based on index treatment received: (1) no intervention; (2) ERCP alone; or (3) cholecystectomy. Multivariate analyses identified predictors of cholecystectomy during index admission and of readmissions. RESULTS A total of 16,121 patients with choledocholithiasis were admitted; 38.4% underwent cholecystectomy, 37.6% endoscopic retrograde cholangiopancreatography alone, and 24.0% no intervention. The patients not receiving a cholecystectomy were more likely to be older, female, have a higher Elixhauser score, do-not-resuscitate status, and at a teaching hospital (all P < .001). Emergency readmissions for recurrent biliary disease were lowest in patients undoing a cholecystectomy (2.2% vs 9.2% endoscopic retrograde cholangiopancreatography and 12.4% no intervention, P < .001), as were readmissions for complications (3.6% vs 5.5% and 7.8%, P < .001). Cholecystectomy reduced rates of readmissions for recurrent disease (odds ratio 0.168, P < .001), for complications (odds ratio 0.540, P < .001), and death during readmission (odds ratio 0.503, P = .007); endoscopic retrograde cholangiopancreatography alone reduced only rates of readmissions. Age was not a predictor of readmission or death. CONCLUSION Index admission cholecystectomy is associated with a lower risk of readmission for biliary disease or complications, as well as death during readmission, in elderly patients. Age alone is not predictive of outcomes; surgical intervention should be guided by clinical condition, comorbidities, and patient preference.
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Affiliation(s)
- Allison E Berndtson
- Department of Surgery; Division of Trauma, Surgical Critical Care, Burns and Acute Care Surgery, UC San Diego, CA.
| | - Todd W Costantini
- Department of Surgery; Division of Trauma, Surgical Critical Care, Burns and Acute Care Surgery, UC San Diego, CA. https://twitter.com/TWCostantini
| | - Alan M Smith
- Department of Surgery; Division of Trauma, Surgical Critical Care, Burns and Acute Care Surgery, UC San Diego, CA
| | - Sara B Edwards
- Department of Surgery; Division of Trauma, Surgical Critical Care, Burns and Acute Care Surgery, UC San Diego, CA
| | - Leslie Kobayashi
- Department of Surgery; Division of Trauma, Surgical Critical Care, Burns and Acute Care Surgery, UC San Diego, CA
| | - Jay J Doucet
- Department of Surgery; Division of Trauma, Surgical Critical Care, Burns and Acute Care Surgery, UC San Diego, CA. https://twitter.com/jaydoucet
| | - Laura N Godat
- Department of Surgery; Division of Trauma, Surgical Critical Care, Burns and Acute Care Surgery, UC San Diego, CA. https://twitter.com/godat_l
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11
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Lamidi S, Williams KM, Hind D, Peckham-Cooper A, Miller AS, Smith AM, Saha A, Macutkiewicz C, Griffiths EA, Catena F, Coccolini F, Toogood G, Tierney GM, Boyd-Carson H, Sartelli M, Blencowe NS, Lockwood S, Coe PO, Lee MJ, Barreto SG, Drake T, Gachabayov M, Hill J, Ioannidis O, Lostoridis E, Mehraj A, Negoi I, Pata F, Steenkamp C, Ahmed S, Alin V, Al-Rashedy M, Atici SD, Bains L, Bandyopadhyay SK, Baraket O, Bates T, Beral D, Brown L, Buonomo L, Burke D, Caravaglios G, Ceresoli M, Chapman SJ, Cillara N, Clarke R, Colak E, Daniels S, Demetrashvili Z, Di Carlo I, Duff S, Dziakova J, Elliott JA, El Zalabany T, Engledow A, Ewnte B, Fraga GP, George R, Giuffrida M, Glasbey J, Isik A, Kechagias A, Kenington C, Kessel B, Khokha V, Kong V, Laloë P, Litvin A, Lostoridis E, Marinis A, Martínez-Pérez A, Menzies D, Mills R, Monzon BI, Morgan R, Neri V, Nita GE, Perra T, Perrone G, Porcu A, Poskus T, Premnath S, Sall I, Sarma DR, Slavchev M, Spence G, Tarasconi A, Tolonen M, Toro A, Venn ML, Vimalachandran D, Wheldon L, Zakaria AD. Defining core patient descriptors for perforated peptic ulcer research: international Delphi. Br J Surg 2022; 109:603-609. [PMID: 35467718 DOI: 10.1093/bjs/znac096] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2021] [Revised: 02/09/2022] [Accepted: 03/08/2022] [Indexed: 10/13/2023]
Abstract
BACKGROUND Perforated peptic ulcer (PPU) remains a common condition globally with significant morbidity and mortality. Previous work has demonstrated variation in reporting of patient characteristics in PPU studies, making comparison of studies and outcomes difficult. The aim of this study was to standardize the reporting of patient characteristics, by creating a core descriptor set (CDS) of important descriptors that should be consistently reported in PPU research. METHODS Candidate descriptors were identified through systematic review and stakeholder proposals. An international Delphi exercise involving three survey rounds was undertaken to obtain consensus on key patient characteristics for future research. Participants rated items on a scale of 1-9 with respect to their importance. Items meeting a predetermined threshold (rated 7-9 by over 70 per cent of stakeholders) were included in the final set and ratified at a consensus meeting. Feedback was provided between rounds to allow refinement of ratings. RESULTS Some 116 clinicians were recruited from 29 countries. A total of 63 descriptors were longlisted from the literature, and 27 were proposed by stakeholders. After three survey rounds and a consensus meeting, 27 descriptors were included in the CDS. These covered demographic variables and co-morbidities, risk factors for PPU, presentation and pathway factors, need for organ support, biochemical parameters, prognostic tools, perforation details, and surgical history. CONCLUSION This study defines the core descriptive items for PPU research, which will allow more robust synthesis of studies.
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12
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Clark B, Elkin J, Marconi A, Turner GF, Smith AM, Joyce D, Miska EA, Juntti SA, Santos ME. Oca2 targeting using CRISPR/Cas9 in the Malawi cichlid Astatotilapia calliptera. R Soc Open Sci 2022; 9:220077. [PMID: 35601449 PMCID: PMC9019512 DOI: 10.1098/rsos.220077] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/20/2022] [Accepted: 03/22/2022] [Indexed: 05/03/2023]
Abstract
Identifying genetic loci underlying trait variation provides insights into the mechanisms of diversification, but demonstrating causality and characterizing the role of genetic loci requires testing candidate gene function, often in non-model species. Here we establish CRISPR/Cas9 editing in Astatotilapia calliptera, a generalist cichlid of the remarkably diverse Lake Malawi radiation. By targeting the gene oca2 required for melanin synthesis in other vertebrate species, we show efficient editing and germline transmission. Gene edits include indels in the coding region, probably a result of non-homologous end joining, and a large deletion in the 3' untranslated region due to homology-directed repair. We find that oca2 knock-out A. calliptera lack melanin, which may be useful for developmental imaging in embryos and studying colour pattern formation in adults. As A. calliptera resembles the presumed generalist ancestor of the Lake Malawi cichlids radiation, establishing genome editing in this species will facilitate investigating speciation, adaptation and trait diversification in this textbook radiation.
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Affiliation(s)
- Bethan Clark
- Department of Zoology, University of Cambridge, UK
| | - Joel Elkin
- Department of Zoology, University of Cambridge, UK
| | | | - George F. Turner
- School of Natural Sciences, Bangor University, Gwynedd LL57 2TH, UK
| | - Alan M. Smith
- Department of Biological and Marine Sciences, University of Hull, UK
| | - Domino Joyce
- Department of Biological and Marine Sciences, University of Hull, UK
| | - Eric A. Miska
- Department of Genetics, University of Cambridge, UK
- Gurdon Institute, University of Cambridge, Cambridge CB2 1QN, UK
- Wellcome Sanger Institute, Wellcome Trust Genome Campus, Cambridge, UK
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13
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Moakes RJA, Senior JJ, Robinson TE, Chipara M, Atansov A, Naylor A, Metcalfe AD, Smith AM, Grover LM. A suspended layer additive manufacturing approach to the bioprinting of tri-layered skin equivalents. APL Bioeng 2021; 5:046103. [PMID: 34888433 PMCID: PMC8635740 DOI: 10.1063/5.0061361] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2021] [Accepted: 10/20/2021] [Indexed: 11/17/2022] Open
Abstract
Skin exhibits a complex structure consisting of three predominant layers (epidermis, dermis, and hypodermis). Extensive trauma may result in the loss of these structures and poor repair, in the longer term, forming scarred tissue and associated reduction in function. Although a number of skin replacements exist, there have been no solutions that recapitulate the chemical, mechanical, and biological roles that exist within native skin. This study reports the use of suspended layer additive manufacturing to produce a continuous tri-layered implant, which closely resembles human skin. Through careful control of the bioink composition, gradients (chemical and cellular) were formed throughout the printed construct. Culture of the model demonstrated that over 21 days, the cellular components played a key role in remodeling the supporting matrix into architectures comparable with those of healthy skin. Indeed, it has been demonstrated that even at seven days post-implantation, the integration of the implant had occurred, with mobilization of the adipose tissue from the surrounding tissue into the construct itself. As such, it is believed that these implants can facilitate healing, commencing from the fascia, up toward the skin surface—a mechanism recently shown to be key within deep wounds.
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Affiliation(s)
- Richard J A Moakes
- School of Chemical Engineering, University of Birmingham, Birmingham B15 2TT, United Kingdom
| | - Jessica J Senior
- Department of Pharmacy, University of Huddersfield, Queensgate, Huddersfield HD1 3DH, United Kingdom
| | - Thomas E Robinson
- School of Chemical Engineering, University of Birmingham, Birmingham B15 2TT, United Kingdom
| | - Miruna Chipara
- School of Chemical Engineering, University of Birmingham, Birmingham B15 2TT, United Kingdom
| | - Aleksandar Atansov
- School of Chemical Engineering, University of Birmingham, Birmingham B15 2TT, United Kingdom
| | - Amy Naylor
- Inflammation and Ageing, University of Birmingham, Birmingham B15 2TT, United Kingdom
| | - Anthony D Metcalfe
- School of Chemical Engineering, University of Birmingham, Birmingham B15 2TT, United Kingdom
| | - Alan M Smith
- Department of Pharmacy, University of Huddersfield, Queensgate, Huddersfield HD1 3DH, United Kingdom
| | - Liam M Grover
- School of Chemical Engineering, University of Birmingham, Birmingham B15 2TT, United Kingdom
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14
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Borst JM, Costantini TW, Reilly L, Smith AM, Stabley R, Steele J, Wintz D, Bansal V, Biffl WL, Godat LN. Driving under the influence: a multi-center evaluation of vehicular crashes in the era of cannabis legalization. Trauma Surg Acute Care Open 2021; 6:e000736. [PMID: 34786487 PMCID: PMC8587622 DOI: 10.1136/tsaco-2021-000736] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2021] [Accepted: 10/26/2021] [Indexed: 11/30/2022] Open
Abstract
Background Eleven states have instituted laws allowing recreational cannabis use leading to growing public health concerns surrounding the effects of cannabis intoxication on driving safety. We hypothesized that after the 2016 legalization of cannabis in California, the use among vehicular injury patients would increase and be associated with increased injury severity. Methods San Diego County’s five adult trauma center registries in were queried from January 2010 to June 2018 for motor vehicle or motorcycle crash patients with completed toxicology screens. Patients were stratified as toxicology negative (TOX−), positive for only THC (THC+), only blood alcohol >0.08% (ETOH+), THC+ETOH, or THC+ with any combination with methamphetamine or cocaine (M/C). County medical examiner data were reviewed to characterize THC use in those with deaths at the scene of injury. Results Of the 11,491 patients identified, there were 61.6% TOX−, 11.7% THC+, 13.7% ETOH+, 5.0% THC+ETOH, and 7.9% M/C. THC+ increased from 7.3% to 14.8% over the study period and peaked at 14.9% post-legalization in 2017. Compared with TOX− patients, THC+ patients were more likely to be male and younger. THC+ patients were also less likely to wear seatbelts (8.5% vs 14.3%, p<0.001) and had increased mean Injury Severity Score (8.4±9.4 vs 9.0±9.9, p<0.001) when compared with TOX− patients. There was no difference in in-hospital mortality between groups. From the medical examiner data of the 777 deaths on scene, 27% were THC+. Discussion THC+ toxicology screens in vehicular injury patients peaked after the 2016 legalization of cannabis. Public education on the risks of driving under the influence of cannabis should be a component of injury prevention initiatives. Level of evidence III, Prognostic
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Affiliation(s)
- Johanna Marie Borst
- Department of Surgery, Division of Trauma, Surgical Critical Care, Burns and Acute Care Surgery, UC San Diego School of Medicine, San Diego, California, USA
| | - Todd W Costantini
- Department of Surgery, Division of Trauma, Surgical Critical Care, Burns and Acute Care Surgery, UC San Diego School of Medicine, San Diego, California, USA
| | - Lindsay Reilly
- Department of Surgery, Division of Trauma, Surgical Critical Care, Burns and Acute Care Surgery, UC San Diego School of Medicine, San Diego, California, USA
| | - Alan M Smith
- Department of Surgery, Division of Trauma, Surgical Critical Care, Burns and Acute Care Surgery, UC San Diego School of Medicine, San Diego, California, USA
| | - Robert Stabley
- Examiner's Office, San Diego County Medical Examiner's Office, San Diego, California, USA
| | - John Steele
- Trauma, Palomar Medical Center, Escondido, California, USA
| | - Diane Wintz
- Trauma, Sharp Memorial Medical Center, San Diego, California, USA
| | - Vishal Bansal
- Trauma, Scripps Mercy Hospital, San Diego, California, USA
| | - Walter L Biffl
- Trauma, Scripps Memorial Hospital, La Jolla, California, USA
| | - Laura N Godat
- Division of Trauma, Surgical Critical Care, Burns and Acute Care Surgery, Department of Surgery, University of California San Diego School of Medicine, San Diego, California, USA
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15
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Pankey CL, Odhiambo JF, Smith AM, Ford SP. Effects of maternal obesity in an ovine model on metabolic outcomes in F2 adults and F3 neonates. Domest Anim Endocrinol 2021; 76:106628. [PMID: 33895699 PMCID: PMC8169583 DOI: 10.1016/j.domaniend.2021.106628] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/13/2020] [Revised: 03/17/2021] [Accepted: 03/19/2021] [Indexed: 10/21/2022]
Abstract
Accumulating evidence suggests that indications of metabolic syndrome can be inherited through the germline as a result of maternal obesity. We hypothesized that diet-induced maternal obesity during gestation would program metabolic consequences for multiple generations of offspring, even when first, second, and third generation offspring (F1, F2, F3, respectively) were fed only to requirements. Control (CON) and obese (OB) ewes (generation 0; F0) were bred to a single ram to produce the first generation of offspring (F1). From 60 d prior to conception through term, CONF0 ate 100% National Research Council recommendations (NRC), while OBF0 ewes ate 150% NRC. All F1, F2, and F3 ate 100% NRC after weaning. All mature F1 ewes were bred to a single ram to generate CONF2 (n = 6) and OBF2 (n = 10). All mature F2 ewes were bred to a single ram to produce CONF3 (n = 6) and OBF3 (n = 10). OBF2 ewes exhibited greater (P < 0.0001) plasma cortisol than CONF2 throughout gestation. A glucose tolerance test at 90% gestation revealed OBF2 ewes had higher (P < 0.05) insulin response with similar glucose, resulting in greater (P < 0.05) insulin resistance. OBF3 neonates had similar weight, lean mass, and body fat mass to CONF3 neonates. These data suggest that multigenerational programming of adverse metabolic phenotypes occur in association with F0 maternal obesity, yet adiposity may return to CON levels in F3 neonates.
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Affiliation(s)
- C L Pankey
- Department of Biomedical Science, West Virginia School of Osteopathic Medicine, Lewisburg, WV, USA; Center for the Study of Fetal Programming, Department of Animal Science, University of Wyoming, Laramie, WY, USA.
| | - J F Odhiambo
- Center for the Study of Fetal Programming, Department of Animal Science, University of Wyoming, Laramie, WY, USA; College of Agriculture and Food Sciences, Florida Agricultural and Mechanical University, Tallahassee, FL, USA
| | - A M Smith
- Center for the Study of Fetal Programming, Department of Animal Science, University of Wyoming, Laramie, WY, USA
| | - S P Ford
- Center for the Study of Fetal Programming, Department of Animal Science, University of Wyoming, Laramie, WY, USA
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16
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Palmer JA, Smith AM, Gryshkova V, Donley ELR, Valentin JP, Burrier RE. A Targeted Metabolomics-Based Assay Using Human Induced Pluripotent Stem Cell-Derived Cardiomyocytes Identifies Structural and Functional Cardiotoxicity Potential. Toxicol Sci 2021; 174:218-240. [PMID: 32040181 DOI: 10.1093/toxsci/kfaa015] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
Implementing screening assays that identify functional and structural cardiotoxicity earlier in the drug development pipeline has the potential to improve safety and decrease the cost and time required to bring new drugs to market. In this study, a metabolic biomarker-based assay was developed that predicts the cardiotoxicity potential of a drug based on changes in the metabolism and viability of human induced pluripotent stem cell-derived cardiomyocytes (hiPSC-CM). Assay development and testing was conducted in 2 phases: (1) biomarker identification and (2) targeted assay development. In the first phase, metabolomic data from hiPSC-CM spent media following exposure to 66 drugs were used to identify biomarkers that identified both functional and structural cardiotoxicants. Four metabolites that represent different metabolic pathways (arachidonic acid, lactic acid, 2'-deoxycytidine, and thymidine) were identified as indicators of cardiotoxicity. In phase 2, a targeted, exposure-based biomarker assay was developed that measured these metabolites and hiPSC-CM viability across an 8-point concentration curve. Metabolite-specific predictive thresholds for identifying the cardiotoxicity potential of a drug were established and optimized for balanced accuracy or sensitivity. When predictive thresholds were optimized for balanced accuracy, the assay predicted the cardiotoxicity potential of 81 drugs with 86% balanced accuracy, 83% sensitivity, and 90% specificity. Alternatively, optimizing the thresholds for sensitivity yields a balanced accuracy of 85%, 90% sensitivity, and 79% specificity. This new hiPSC-CM-based assay provides a paradigm that can identify structural and functional cardiotoxic drugs that could be used in conjunction with other endpoints to provide a more comprehensive evaluation of a drug's cardiotoxicity potential.
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Affiliation(s)
| | - Alan M Smith
- Stemina Biomarker Discovery, Inc, Madison, Wisconsin
| | - Vitalina Gryshkova
- UCB Biopharma SPRL, Investigative Toxicology, Development Science, B-1420 Braine L'Alleud, Belgium
| | | | - Jean-Pierre Valentin
- UCB Biopharma SPRL, Investigative Toxicology, Development Science, B-1420 Braine L'Alleud, Belgium
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17
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Smith AM, Huynh P, Griffin S, Baughn M, Monka P. Strong, non-specific adhesion using C-lectin heterotrimers in a molluscan defensive secretion. Integr Comp Biol 2021; 61:1440-1449. [PMID: 34048555 DOI: 10.1093/icb/icab100] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
The defensive mucus produced by the slug Arion subfuscus is tough and remarkably sticky. It spreads rapidly and adheres strongly to a wide range of surfaces. The adhesion is equally strong on wettable (glass) and non-wettable (plastic) surfaces. The adhesion appears to depend on a group of proteins that adsorb equally well to a wide range of different natural and artificial surfaces. Prominent among these proteins were those that distinguish the adhesive secretion from the non-adhesive mucus. The adhesive proteins were not washed off by non-ionic detergent, nor was the adhesion of the glue as a whole affected by this treatment. In contrast, high salt concentrations washed the most abundant adhesive proteins off the surfaces, and correspondingly weakened the glue's attachment. The most abundant of the adhesive proteins were C-lectins, which appear to form heterotrimers. These and other lectin-like proteins in slug glue have a high proportion of aromatic amino acids at conserved locations, and are relatively small and often basic. The aromatic and cationic side chains may provide a powerful combination promoting and maintaining surface adhesion.
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Affiliation(s)
- A M Smith
- Ithaca College, Department of Biology, Ithaca, NY
| | - P Huynh
- Ithaca College, Department of Biology, Ithaca, NY
| | - S Griffin
- Ithaca College, Department of Biology, Ithaca, NY
| | - M Baughn
- Ithaca College, Department of Biology, Ithaca, NY
| | - P Monka
- Ithaca College, Department of Biology, Ithaca, NY
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18
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Armstrong G, Toogood G, Jayne DG, Smith AM. P11: NEAR INFRARED FLUORESCENT CHOLANGIOGRAPHY IN LAPAROSCOPIC CHOLECYSTECTOMY: A SINGLE CENTRE FEASIBILITY STUDY. THE OPTIMUM DOSING REGIME, LIMITATIONS AND WHERE NEXT? Br J Surg 2021. [DOI: 10.1093/bjs/znab117.096] [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: 11/13/2022]
Abstract
Abstract
Introduction
This study explored near-infrared fluorescent cholangiography (NIRFC) with Indocyanine Green (ICG) during laparoscopic cholecystectomy (LC) surgery in a tertiary referral hepatobiliary unit. ICG binds to albumin and is excreted in bile. NIRFC utilises the fluorescent and excretory properties of ICG to provide dynamic extrahepatic bile duct mapping during LC.
Method
Non-randomised single centre feasibility study. Twenty-two participants were sequentially allocated to four dosing subgroups prior to NIRFC assisted LC. Each received a single intravenous dose of ICG prior to LC with the Stryker Novadaq NIR laparoscope. The biliary anatomy was assessed with NIRFC at three time-points, detection was compared to radiological cholangiogram where available and surgeon satisfaction was assessed.
Result
Eight participants received 2.5mg ICG 20-40min before surgery, four 0.25mg/kg 20-40min, five 90min – 180min and five 12 – 36 hour pre-operatively. Average age 50 years (S.D±15), BMI 27.5m2 (S.D±3.6), 6/22 were acute LC procedures. The prolonged dosing interval produced increased extrahepatic biliary structure identification (p = 0.016), reduced noise to signal ratio and was consistently preferred by the operating surgeon. NIRFC was inferior to radiological cholangiogram (n = 10) (p = 0.014) for bile duct mapping. We observed iatrogenic bile spillage saturating the field and obscuring structure differentiation and peri-hilar inflammation impeding fluorescent detection in acute LC.
Conclusion
The dosing regimen 0.25mg/kg ICG 12 to 36 hours prior to surgery provides optimum NIRFC structure visualisation. Fluorescent tissue penetrance is limited in acute peri-hilar inflammation. More research in to the efficiency of NIRFC in emergency LC is required.
Take-home message
An intravenous dose of 0.25mg/kg of Indocyanine Green 12 to 36 hours before surgery is the optimum dosing regimen for increased extra-hepatic bile duct structures with near infrared fluorescent cholangiography. The role of NIRFC in acute laparoscopic cholecystectomy surgery remains ill-defined.
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Affiliation(s)
| | - G Toogood
- University of Leeds, Leeds UK
- Leeds Teaching Hospital Trust, Leeds, UK
| | - DG Jayne
- University of Leeds, Leeds UK
- Leeds Teaching Hospital Trust, Leeds, UK
| | - AM Smith
- University of Leeds, Leeds UK
- Leeds Teaching Hospital Trust, Leeds, UK
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19
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Orr RJS, Di Martino E, Gordon DP, Ramsfjell MH, Mello HL, Smith AM, Liow LH. A broadly resolved molecular phylogeny of New Zealand cheilostome bryozoans as a framework for hypotheses of morphological evolution. Mol Phylogenet Evol 2021; 161:107172. [PMID: 33813020 DOI: 10.1016/j.ympev.2021.107172] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2020] [Revised: 03/04/2021] [Accepted: 03/29/2021] [Indexed: 10/21/2022]
Abstract
Larger molecular phylogenies based on ever more genes are becoming commonplace with the advent of cheaper and more streamlined sequencing and bioinformatics pipelines. However, many groups of inconspicuous but no less evolutionarily or ecologically important marine invertebrates are still neglected in the quest for understanding species- and higher-level phylogenetic relationships. Here, we alleviate this issue by presenting the molecular sequences of 165 cheilostome bryozoan species from New Zealand waters. New Zealand is our geographic region of choice as its cheilostome fauna is taxonomically, functionally and ecologically diverse, and better characterized than many other such faunas in the world. Using this most taxonomically broadly-sampled and statistically-supported cheilostome phylogeny comprising 214 species, when including previously published sequences, and 17 genes (2 nuclear and 15 mitochondrial) we tested several existing systematic hypotheses based solely on morphological observations. We find that lower taxonomic level hypotheses (species and genera) are robust while our inferred trees did not reflect current higher-level systematics (family and above), illustrating a general need for the rethinking of current hypotheses. To illustrate the utility of our new phylogeny, we reconstruct the evolutionary history of frontal shields (i.e., a calcified body-wall layer in ascus-bearing cheilostomes) and ask if its presence has any bearing on the diversification rates of cheilostomes.
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Affiliation(s)
- R J S Orr
- Natural History Museum, University of Oslo, Oslo, Norway.
| | - E Di Martino
- Natural History Museum, University of Oslo, Oslo, Norway
| | - D P Gordon
- National Institute of Water and Atmospheric Research, Wellington, New Zealand
| | - M H Ramsfjell
- Natural History Museum, University of Oslo, Oslo, Norway
| | - H L Mello
- Department of Marine Science, University of Otago, Dunedin, New Zealand
| | - A M Smith
- Department of Marine Science, University of Otago, Dunedin, New Zealand
| | - L H Liow
- Natural History Museum, University of Oslo, Oslo, Norway; Centre for Ecological and Evolutionary Synthesis, Department of Biosciences, University of Oslo, Oslo, Norway.
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Lumry WR, Weller K, Magerl M, Banerji A, Longhurst HJ, Riedl MA, Lewis HB, Lu P, Devercelli G, Jain G, Maurer M, Hébert J, Ritchie B, Sussman G, Yang WH, Martinez‐Saguer I, Staubach P, Cicardi M, Shennak M, Zaragoza‐Urdaz RH, Anderson J, Baptist AP, Bernstein JA, Boggs PB, Busse PJ, Craig T, Davis‐Lorton M, Gierer S, Gower RG, Harris D, Hong DI, Jacobs J, Johnston DT, Li HH, Lockey RF, Lugar P, Manning ME, McNeil DL, Melamed I, Mostofi T, Nickel T, Otto WR, Petrov AA, Radojicic C, Rehman SM, Schwartz LB, Shapiro R, Sher E, Smith AM, Soteres D, Tachdjian R, Wedner HJ, Weinstein ME, Zafra H. Impact of lanadelumab on health-related quality of life in patients with hereditary angioedema in the HELP study. Allergy 2021; 76:1188-1198. [PMID: 33258114 PMCID: PMC8247292 DOI: 10.1111/all.14680] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2020] [Revised: 11/01/2020] [Accepted: 11/14/2020] [Indexed: 01/20/2023]
Abstract
Background An objective of the phase 3 HELP Study was to investigate the effect of lanadelumab on health‐related quality of life (HRQoL) in patients with hereditary angioedema (HAE). Methods Patients with HAE‐1/2 received either lanadelumab 150 mg every 4 weeks (q4wks; n = 28), 300 mg q4wks (n = 29), 300 mg every 2 weeks (q2wks; n = 27), or placebo (n = 41) for 26 weeks (days 0–182). The Angioedema Quality of Life Questionnaire (AE‐QoL) was administered monthly, consisting of four domain (functioning, fatigue/mood, fears/shame, nutrition) and total scores. The generic EQ‐5D‐5L questionnaire was administered on days 0, 98, and 182. Comparisons were made between placebo and (a) all lanadelumab‐treated patients and (b) individual lanadelumab groups for changes in scores (day 0–182) and proportions achieving the minimal clinically important difference (MCID, −6) in AE‐QoL total score. Results Compared with the placebo group, the lanadelumab total group demonstrated significantly greater improvements in AE‐QoL total and domain scores (mean change, −13.0 to −29.3; p < 0.05 for all); the largest improvement was in functioning. A significantly greater proportion of the lanadelumab total group achieved the MCID (70% vs 37%; p = 0.001). The lanadelumab 300 mg q2wks group had the highest proportion (81%; p = 0.001) and was 7.2 times more likely to achieve the MCID than the placebo group. Mean EQ‐5D‐5L scores at day 0 were high in all groups, indicating low impairment, with no significant changes at day 182. Conclusion Patients with HAE‐1/2 experienced significant and clinically meaningful improvements in HRQoL measured by AE‐QoL following lanadelumab treatment in the HELP Study.
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Affiliation(s)
- William R. Lumry
- Allergy Asthma Research Associates Research Center Dallas TX USA
| | - Karsten Weller
- Dermatological Allergology Allergie‐Centrum‐Charité Department of Dermatology and Allergy Charité – Universitätsmedizin Berlin Berlin Germany
| | - Markus Magerl
- Dermatological Allergology Allergie‐Centrum‐Charité Department of Dermatology and Allergy Charité – Universitätsmedizin Berlin Berlin Germany
| | - Aleena Banerji
- Division of Rheumatology, Allergy and Immunology Massachusetts General HospitalHarvard Medical School Boston MA USA
| | - Hilary J. Longhurst
- Addenbrooke’s Hospital Cambridge University Hospitals NHS Foundation TrustCambridge, and University College London Hospitals London UK
| | - Marc A. Riedl
- Division of Rheumatology Allergy & Immunology University of California San Diego La Jolla CA USA
| | | | - Peng Lu
- Takeda Pharmaceutical Company Limited Lexington MA USA
| | | | - Gagan Jain
- Takeda Pharmaceutical Company Limited Lexington MA USA
| | - Marcus Maurer
- Dermatological Allergology Allergie‐Centrum‐Charité Department of Dermatology and Allergy Charité – Universitätsmedizin Berlin Berlin Germany
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21
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Ganguli A, Mostafa A, Saavedra C, Kim Y, Le P, Faramarzi V, Feathers RW, Berger J, Ramos-Cruz KP, Adeniba O, Diaz GJP, Drnevich J, Wright CL, Hernandez AG, Lin W, Smith AM, Kosari F, Vasmatzis G, Anastasiadis PZ, Bashir R. Three-dimensional microscale hanging drop arrays with geometric control for drug screening and live tissue imaging. Sci Adv 2021; 7:7/17/eabc1323. [PMID: 33893093 PMCID: PMC8064630 DOI: 10.1126/sciadv.abc1323] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/07/2020] [Accepted: 03/05/2021] [Indexed: 05/09/2023]
Abstract
Existing three-dimensional (3D) culture techniques are limited by trade-offs between throughput, capacity for high-resolution imaging in living state, and geometric control. Here, we introduce a modular microscale hanging drop culture where simple design elements allow high replicates for drug screening, direct on-chip real-time or high-resolution confocal microscopy, and geometric control in 3D. Thousands of spheroids can be formed on our microchip in a single step and without any selective pressure from specific matrices. Microchip cultures from human LN229 glioblastoma and patient-derived mouse xenograft cells retained genomic alterations of originating tumors based on mate pair sequencing. We measured response to drugs over time with real-time microscopy on-chip. Last, by engineering droplets to form predetermined geometric shapes, we were able to manipulate the geometry of cultured cell masses. These outcomes can enable broad applications in advancing personalized medicine for cancer and drug discovery, tissue engineering, and stem cell research.
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Affiliation(s)
- A Ganguli
- Department of Bioengineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
- Nick Holonyak Jr. Micro and Nanotechnology Laboratory, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
| | - A Mostafa
- Department of Bioengineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
- Nick Holonyak Jr. Micro and Nanotechnology Laboratory, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
| | - C Saavedra
- Nick Holonyak Jr. Micro and Nanotechnology Laboratory, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
| | - Y Kim
- Nick Holonyak Jr. Micro and Nanotechnology Laboratory, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
- Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
| | - P Le
- Department of Bioengineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
- Nick Holonyak Jr. Micro and Nanotechnology Laboratory, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
| | - V Faramarzi
- Nick Holonyak Jr. Micro and Nanotechnology Laboratory, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
| | - R W Feathers
- Mayo-Illinois Alliance for Technology-Based Healthcare, Urbana, IL, USA
- Department of Cancer Biology, Mayo Clinic, Jacksonville, FL 32224, USA
| | - J Berger
- Department of Bioengineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
- Nick Holonyak Jr. Micro and Nanotechnology Laboratory, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
| | - K P Ramos-Cruz
- Department of Bioengineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
- Nick Holonyak Jr. Micro and Nanotechnology Laboratory, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
| | - O Adeniba
- Nick Holonyak Jr. Micro and Nanotechnology Laboratory, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
| | - G J Pagan Diaz
- Department of Bioengineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
- Nick Holonyak Jr. Micro and Nanotechnology Laboratory, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
| | - J Drnevich
- High-Performance Biological Computing, Roy J. Carver Biotechnology Center, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
| | - C L Wright
- DNA Services Lab, Roy J. Carver Biotechnology Center, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
| | - A G Hernandez
- DNA Services Lab, Roy J. Carver Biotechnology Center, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
| | - W Lin
- Mayo-Illinois Alliance for Technology-Based Healthcare, Urbana, IL, USA
- Department of Cancer Biology, Mayo Clinic, Jacksonville, FL 32224, USA
| | - A M Smith
- Department of Bioengineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
- Nick Holonyak Jr. Micro and Nanotechnology Laboratory, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
- Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
- Department of Biomedical and Translational Sciences, Carle Illinois College of Medicine, Urbana, IL 61820, USA
- Carl R. Woese Institute for Genomic Biology, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
- Cancer Center at Illinois, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
| | - F Kosari
- Mayo-Illinois Alliance for Technology-Based Healthcare, Urbana, IL, USA
- Department of Molecular Medicine, Mayo Clinic, Rochester, MN 55905, USA
| | - G Vasmatzis
- Mayo-Illinois Alliance for Technology-Based Healthcare, Urbana, IL, USA
- Department of Molecular Medicine, Mayo Clinic, Rochester, MN 55905, USA
| | - P Z Anastasiadis
- Mayo-Illinois Alliance for Technology-Based Healthcare, Urbana, IL, USA.
- Department of Cancer Biology, Mayo Clinic, Jacksonville, FL 32224, USA
| | - R Bashir
- Department of Bioengineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA.
- Nick Holonyak Jr. Micro and Nanotechnology Laboratory, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
- Mayo-Illinois Alliance for Technology-Based Healthcare, Urbana, IL, USA
- Department of Biomedical and Translational Sciences, Carle Illinois College of Medicine, Urbana, IL 61820, USA
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Kozlowski AM, Yates EA, Roubroeks JP, Tømmeraas K, Smith AM, Morris GA. Hydrolytic Degradation of Heparin in Acidic Environments: Nuclear Magnetic Resonance Reveals Details of Selective Desulfation. ACS Appl Mater Interfaces 2021; 13:5551-5563. [PMID: 33471995 DOI: 10.1021/acsami.0c20198] [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] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Heparin is a complex glycosaminoglycan, derived mainly from pig mucosa, used therapeutically for its anticoagulant activity. Yet, owing largely to the chain complexity, the progressive effects of environmental conditions on heparin structure have not been fully described. A systematic study of the influence of acidic hydrolysis on heparin chain length and substitution has therefore been conducted. Changes in the sulfation pattern, monitored via 2D NMR, revealed initial de-N-sulfation of the molecule (pH 1/ 40 °C) and unexpectedly identified the secondary sulfate of iduronate as more labile than the 6-O-sulfate of glucosamine residues under these conditions (pH 1/ 60 °C). Additionally, the loss of sulfate groups, rather than depolymerization, accounted for most of the reduction in molecular weight. This provides an alternative route to producing partially 2-O-de-sulfated heparin derivatives that avoids using conventional basic conditions and may be of value in the optimization of processes associated with the production of heparin pharmaceuticals.
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Affiliation(s)
- Aleksandra M Kozlowski
- Biopolymer Research Centre, School of Applied Sciences, University of Huddersfield, Huddersfield HD1 3DH, United Kingdom
| | - Edwin A Yates
- Department of Biochemistry and Systems Biology, Institute of Systems, Molecular and Integrative Biology, University of Liverpool, Liverpool, L69 7ZB, United Kingdom
| | | | | | - Alan M Smith
- Biopolymer Research Centre, School of Applied Sciences, University of Huddersfield, Huddersfield HD1 3DH, United Kingdom
| | - Gordon A Morris
- Biopolymer Research Centre, School of Applied Sciences, University of Huddersfield, Huddersfield HD1 3DH, United Kingdom
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Smith AM, Senior JJ. Alginate Hydrogels with Tuneable Properties. Adv Biochem Eng Biotechnol 2021; 178:37-61. [PMID: 33547500 DOI: 10.1007/10_2020_161] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
Alginate is a material that has many biomedical applications due to its low toxicity and a variety of favourable physical properties. In particular, the ease in which hydrogels are formed from alginate and the variety of mechanical behaviours that can be imparted on the hydrogels, by understanding alginate chemistry and intuitive design, has made alginate the most widely investigated polysaccharide used for tissue engineering. This chapter provides an overview of alginate, from how the source and natural variations in composition can influence mechanical properties of alginate hydrogels, through to some innovative techniques used to modify and functionalise the hydrogels designed specifically for cell-based therapies. The main focus is on how these strategies of understanding and controlling the chemistry of alginates have resulted in the development of hydrogels that can be tuned to deliver the physical behaviours required for successful application. This will also highlight how research on the physicochemical properties has helped alginate evolve from a structural polysaccharide in brown seaweed into a highly tuneable, multifunctional, smart biomaterial, which is likely to find further biomedical applications in the future.
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Affiliation(s)
- Alan M Smith
- Department of Pharmacy, School of Applied Sciences, University of Huddersfield, Huddersfield, UK.
| | - Jessica J Senior
- Department of Pharmacy, School of Applied Sciences, University of Huddersfield, Huddersfield, UK
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24
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Peña SM, Oak ASW, Smith AM, Mayo TT, Elewski BE. Topical crisaborole is an efficacious steroid-sparing agent for treating mild-to-moderate seborrhoeic dermatitis. J Eur Acad Dermatol Venereol 2020; 34:e809-e812. [PMID: 32452557 DOI: 10.1111/jdv.16673] [Citation(s) in RCA: 1] [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] [Received: 04/20/2020] [Revised: 05/13/2020] [Accepted: 05/15/2020] [Indexed: 11/29/2022]
Affiliation(s)
- S M Peña
- Department of Dermatology, School of Medicine, University of Alabama at Birmingham, Birmingham, AL, USA
| | - A S W Oak
- Department of Dermatology, School of Medicine, University of Alabama at Birmingham, Birmingham, AL, USA
| | - A M Smith
- Department of Dermatology, School of Medicine, University of Alabama at Birmingham, Birmingham, AL, USA
| | - T T Mayo
- Department of Dermatology, School of Medicine, University of Alabama at Birmingham, Birmingham, AL, USA
| | - B E Elewski
- Department of Dermatology, School of Medicine, University of Alabama at Birmingham, Birmingham, AL, USA
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25
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Riedl MA, Maurer M, Bernstein JA, Banerji A, Longhurst HJ, Li HH, Lu P, Hao J, Juethner S, Lumry WR, Hébert J, Ritchie B, Sussman G, Yang WH, Escuriola Ettingshausen C, Magerl M, Martinez‐Saguer I, Maurer M, Staubach P, Zimmer S, Cicardi M, Perego F, Wu MA, Zanichelli A, Al‐Ghazawi A, Shennak M, Zaragoza‐Urdaz RH, Ghurye R, Longhurst HJ, Zinser E, Anderson J, Banerji A, Baptist AP, Bernstein JA, Boggs PB, Busse PJ, Christiansen S, Craig T, Davis‐Lorton M, Gierer S, Gower RG, Harris D, Hong DI, Jacobs J, Johnston DT, Levitch ES, Li HH, Lockey RF, Lugar P, Lumry WR, Manning ME, McNeil DL, Melamed I, Mostofi T, Nickel T, Otto WR, Petrov AA, Poarch K, Radojicic C, Rehman SM, Riedl MA, Schwartz LB, Shapiro R, Sher E, Smith AM, Smith TD, Soteres D, Tachdjian R, Wedner HJ, Weinstein ME, Zafra H, Zuraw BL. Lanadelumab demonstrates rapid and sustained prevention of hereditary angioedema attacks. Allergy 2020; 75:2879-2887. [PMID: 32452549 PMCID: PMC7689768 DOI: 10.1111/all.14416] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2019] [Revised: 04/15/2020] [Accepted: 04/20/2020] [Indexed: 02/06/2023]
Abstract
Background Lanadelumab demonstrated efficacy in preventing hereditary angioedema (HAE) attacks in the phase 3 HELP Study. Objective To assess time to onset of effect and long‐term efficacy of lanadelumab, based on exploratory findings from the HELP Study. Methods Eligible patients with HAE type I/II received lanadelumab 150 mg every 4 weeks (q4wks), 300 mg q4wks, 300 mg q2wks, or placebo. Ad hoc analyses evaluated day 0‐69 findings using a Poisson regression model accounting for overdispersion. Least‐squares mean monthly HAE attack rate for lanadelumab was compared with placebo. Intrapatient comparisons for days 0‐69 versus steady state (days 70‐182) used a paired t test for continuous endpoints or Kappa statistics for categorical endpoints. Results One hundred twenty‐five patients were randomized and treated. During days 0‐69, mean monthly attack rate was significantly lower with lanadelumab (0.41‐0.76) vs placebo (2.04), including attacks requiring acute treatment (0.33‐0.61 vs 1.66) and moderate/severe attacks (0.31‐0.48 vs 1.33, all P ≤ .001). More patients receiving lanadelumab vs placebo were attack free (37.9%‐48.1% vs 7.3%) and responders (85.7%‐100% vs 26.8%). During steady state, the efficacy of lanadelumab vs placebo was similar or improved vs days 0‐69. Intrapatient differences were significant with lanadelumab 300 mg q4wks for select outcomes. Lanadelumab efficacy was durable—HAE attack rate was consistently lower vs placebo, from the first 2 weeks of treatment through study end. Treatment emergent adverse events were comparable during days 0‐69 and 70‐182. Conclusion Protection with lanadelumab started from the first dose and continued throughout the entire study period.
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Affiliation(s)
- Marc A. Riedl
- Division of Rheumatology, Allergy and Immunology University of California, San Diego San Diego CA USA
| | - Marcus Maurer
- Dermatological Allergology Allergie‐Centrum‐Charité Department of Dermatology and Allergy Charité – Universitätsmedizin Berlin Berlin Germany
| | - Jonathan A. Bernstein
- Division of Immunology/Allergy Section Department of Internal Medicine University of Cincinnati Cincinnati OH USA
- Bernstein Clinical Research Center Cincinnati OH USA
| | - Aleena Banerji
- Division of Rheumatology, Allergy and Immunology Department of Medicine Massachusetts General Hospital Harvard Medical School Boston MA USA
| | - Hilary J. Longhurst
- Addenbrooke's Hospital Cambridge University Hospitals NHS Foundation Trust, Cambridge and University College London Hospitals London UK
| | - H. Henry Li
- Institute for Asthma and Allergy, P.C. Chevy Chase MD USA
| | - Peng Lu
- Shire, a Takeda company Lexington MA USA
| | - James Hao
- Shire, a Takeda company Lexington MA USA
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26
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Abstract
Bioactive peptides (BAPs) can be derived from a variety of sources; these could be from dietary proteins which are then broken down in the gastrointestinal tract to release BAPs, or they can be isolated from various sources ex vivo. Sources include plant-based proteins such as soy, and chickpeas, and animal proteins from waste from the meat industry and from fish skin. Bioinformatics is also a useful approach to assess the peptides released from digests due to the great number of possible sequences that can be isolated from proteins. Therefore, an in silico analysis of peptides could potentially lead to a more rapid discovery of BAPs. This article investigates a "crude" liver peptide mixture derived from papain hydrolysis of porcine liver and purified peptides derived from the hydrolysates following HPLC fractionation and in silico digestion of the host proteins identified using LC-MS/MS. This allowed the identification of two proteins (cytosol aminopeptidase and haemoglobin subunit alpha) present in the "crude" mixture after LC-MS/MS. In silico hydrolysis of these proteins identified that several peptides were predicted to be both present in the crude mixture using the BIOPEP database and to have potential bioactivity using the Peptide Ranker tool. Peptides (FWG, MFLG and SDPPLVFVG) with the greatest potential bioactivity and which had not previously been reported in the literature were then synthesised. The results indicated that the predicted bioactivity of the synthetic peptides would likely include antioxidant activity. FWG and MFLG derived from the in silico papain hydrolysis of cytosol aminopeptidase showed activity better or comparable to Trolox in the Oxygen Radical Absorbance Capacity (ORAC) assay. The use of these in silico tools, alongside a robust range of biochemical assays which cover a wider range of bioactivities would be a way of improving the discovery of novel bioactive peptides.
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Affiliation(s)
- Nicholas A. Pearman
- Department of Chemical Sciences, School of Applied Sciences, University of Huddersfield, Huddersfield, HD1 3DH, UK
- Department of Pharmacy, School of Applied Sciences, University of Huddersfield, Huddersfield, HD1 3DH, UK
| | - Elena Ronander
- Biofac A/S, Englandsvej 350-356, DK-2770, Kastrup, Denmark
| | - Alan M. Smith
- Department of Pharmacy, School of Applied Sciences, University of Huddersfield, Huddersfield, HD1 3DH, UK
| | - Gordon A. Morris
- Department of Chemical Sciences, School of Applied Sciences, University of Huddersfield, Huddersfield, HD1 3DH, UK
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27
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Blackwell T, Ford AGP, Ciezarek AG, Bradbeer SJ, Gracida Juarez CA, Smith AM, Ngatunga BP, Shechonge A, Tamatamah R, Etherington G, Haerty W, Di Palma F, Turner GF, Genner MJ. Newly discovered cichlid fish biodiversity threatened by hybridization with non-native species. Mol Ecol 2020; 30:895-911. [PMID: 33063411 DOI: 10.1111/mec.15638] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2020] [Accepted: 08/24/2020] [Indexed: 12/24/2022]
Abstract
Invasive freshwater fishes are known to readily hybridize with indigenous congeneric species, driving loss of unique and irreplaceable genetic resources. Here we reveal that newly discovered (2013-2016) evolutionarily significant populations of Korogwe tilapia (Oreochromis korogwe) from southern Tanzania are threatened by hybridization with the larger invasive Nile tilapia (Oreochromis niloticus). We use a combination of morphology, microsatellite allele frequencies and whole genome sequences to show that O. korogwe from southern lakes (Nambawala, Rutamba and Mitupa) are distinct from geographically disjunct populations in northern Tanzania (Zigi River and Mlingano Dam). We also provide genetic evidence of O. korogwe × niloticus hybrids in three southern lakes and demonstrate heterogeneity in the extent of admixture across the genome. Finally, using the least admixed genomic regions we estimate that the northern and southern O. korogwe populations most plausibly diverged ~140,000 years ago, suggesting that the geographical separation of the northern and southern groups is not a result of a recent translocation, and instead these populations represent independent evolutionarily significant units. We conclude that these newly discovered and phenotypically unique cichlid populations are already threatened by hybridization with an invasive species, and propose that these irreplaceable genetic resources would benefit from conservation interventions.
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Affiliation(s)
| | - Antonia G P Ford
- Department of Life Sciences, Whitelands College, University of Roehampton, London, UK
| | - Adam G Ciezarek
- Earlham Institute, Norwich Research Park Innovation Centre, Norwich, UK
| | | | | | - Alan M Smith
- Department of Biological Sciences, University of Hull, Hull, UK
| | | | - Asilatu Shechonge
- Tanzania Fisheries Research Institute (TAFIRI), Dar es Salaam, Tanzania
| | - Rashid Tamatamah
- Tanzania Fisheries Research Institute (TAFIRI), Dar es Salaam, Tanzania
| | | | - Wilfried Haerty
- Earlham Institute, Norwich Research Park Innovation Centre, Norwich, UK
| | - Federica Di Palma
- Earlham Institute, Norwich Research Park Innovation Centre, Norwich, UK.,Department of Biological and Medical Sciences, University of East Anglia, Norwich, UK
| | - George F Turner
- School of Biological Sciences, Bangor University, Bangor, UK
| | - Martin J Genner
- School of Biological Sciences, University of Bristol, Bristol, UK
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28
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Smith AM, Leeming A, Fang Z, Hatchard T, Mioduszewski O, Schneider MA, Ferdossifard A, Shergill Y, Khoo EL, Poulin P. Mindfulness-based stress reduction alters brain activity for breast cancer survivors with chronic neuropathic pain: preliminary evidence from resting-state fMRI. J Cancer Surviv 2020; 15:518-525. [PMID: 33000446 DOI: 10.1007/s11764-020-00945-0] [Citation(s) in RCA: 5] [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] [Received: 07/15/2020] [Accepted: 09/18/2020] [Indexed: 12/24/2022]
Abstract
PURPOSE Breast cancer continues to be the most commonly diagnosed cancer among Canadian women, with as many as 25-60% of women suffering from chronic neuropathic pain (CNP) as a pervasive consequence of treatment. While pharmacological interventions have shown limited efficacy for the management of CNP to date, psychological interventions, such as mindfulness-based stress reduction (MBSR), may be a promising alterative for improving pain-related problems. The purpose of this study was to use brain imaging methods to investigate this potential. METHODS Resting-state fMRI was used in female breast cancer survivors with CNP before and after an 8-week MBSR course (n = 13) and compared with a waitlist control group (n = 10). RESULTS Focusing on the default mode network, the most significant results show greater posterior cingulate connectivity with medial prefrontal regions post-MBSR intervention. Moreover, this change in connectivity correlated with reduced pain severity for the MBSR group. CONCLUSIONS These results provide empirical evidence of a change in the brain following MBSR intervention associated with changes in the subjective experience of pain. IMPLICATIONS FOR CANCER SURVIVORS This study gives hope for a non-invasive method of easing the struggle of CNP in women following breast cancer treatment.
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Affiliation(s)
- A M Smith
- School of Psychology, University of Ottawa, 136 Jean-Jacques Lussier Room 2079, Ottawa, Ontario, K1N 6N5, Canada.
| | - A Leeming
- School of Psychology, University of Ottawa, 136 Jean-Jacques Lussier Room 2079, Ottawa, Ontario, K1N 6N5, Canada
| | - Z Fang
- School of Psychology, University of Ottawa, 136 Jean-Jacques Lussier Room 2079, Ottawa, Ontario, K1N 6N5, Canada
| | - T Hatchard
- Department of Psychiatry and Behavioural Neurosciences, McMaster University, Hamilton, Canada
| | - O Mioduszewski
- School of Psychology, University of Ottawa, 136 Jean-Jacques Lussier Room 2079, Ottawa, Ontario, K1N 6N5, Canada
| | - M A Schneider
- Department of Psychiatry and Behavioural Neurosciences, McMaster University, Hamilton, Canada
| | - A Ferdossifard
- Department of Psychiatry and Behavioural Neurosciences, McMaster University, Hamilton, Canada
| | - Y Shergill
- The Ottawa Health Research Institute, Ottawa, Canada
| | - E-L Khoo
- The Ottawa Health Research Institute, Ottawa, Canada
| | - P Poulin
- Department of Anesthesiology and Pain Medicine, University of Ottawa, Ottawa, Canada
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Palmer JA, Smith AM, Colwell MR, Donley EL, Kirchner FR, Burrier RE. Biomarker-based prediction of tyrosine kinase inhibitor cardiotoxicity using human iPSC-derived cardiomyocytes. J Pharmacol Toxicol Methods 2020. [DOI: 10.1016/j.vascn.2020.106854] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Senjoti FG, Timmins P, Conway BR, Smith AM. Optimizing ophthalmic delivery of a poorly water soluble drug from an aqueous in situ gelling system. Eur J Pharm Biopharm 2020; 154:1-7. [PMID: 32599271 DOI: 10.1016/j.ejpb.2020.06.016] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2019] [Revised: 05/26/2020] [Accepted: 06/22/2020] [Indexed: 12/24/2022]
Abstract
Poorly soluble drugs are often unsuitable to incorporate in ocular in situ gelling systems due to the aqueous based gelling formulations and low volumes administered. For such formulations to be successful, the administered drug must have sufficient solubility to diffuse from the formulation to the eye and should not affect the gelation of the in situ gelling material. Drug salt forms can improve the solubility of poorly soluble drugs, however, as in situ gel forming formulations are often designed to be crosslinked by salts (present the lacrimal fluid) it can make salt forms difficult to formulate. The aim of this study was to develop an in situ gel forming ophthalmic formulation of a poorly soluble drug flurbiprofen (FBP) through cyclodextrin complex formation and to analyse the impact on gelation, release and permeation through the cornea. Hydroxypropyl-beta-cyclodextrin (HβCD) was used as a complexing agent and low acyl gellan gum was added to the FBP- HβCD complex as a water soluble in situ gelling polymer. Measurements were performed using rheo-dissolution, which utilises a rheometer with a modified lower plate that has the unique ability to allow rheological measurement and analysis of drug release simultaneously. An ex-vivo permeation study was also performed using porcine cornea. Rheological measurements in terms of elastic (G') and viscous (G″) modulus showed rapid gelation of the formulation upon contact with simulated lacrimal fluid (SLF). Approximately, 97% FBP was released when 10% HβCD was used and release was decreased to 79% when the amount of HβCD was increased to 20%. The percentage of drug permeation through the cornea was 55% in 300 min whereas the marketed non gelling eye drop formulation containing FBP sodium showed only 37% permeation. The data presented here, revealed that not only could a poorly soluble drug be complexed with cyclodextrin and loaded into an in situ gelling system without interfering with the gelation, but also permeability the of the drug improved.
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Affiliation(s)
- F G Senjoti
- Department of Pharmacy, School of Applied Sciences, University of Huddersfield, Queensgate, Huddersfield HD1 3DH, UK
| | - P Timmins
- Department of Pharmacy, School of Applied Sciences, University of Huddersfield, Queensgate, Huddersfield HD1 3DH, UK
| | - B R Conway
- Department of Pharmacy, School of Applied Sciences, University of Huddersfield, Queensgate, Huddersfield HD1 3DH, UK
| | - A M Smith
- Department of Pharmacy, School of Applied Sciences, University of Huddersfield, Queensgate, Huddersfield HD1 3DH, UK.
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Thacoor A, Pathak S, Macutkiewicz C, Smith AM. AUTHORS' RESPONSE to Views on the use of intraoperative cholangiography. Ann R Coll Surg Engl 2020; 102:1. [PMID: 32594752 PMCID: PMC7388947 DOI: 10.1308/rcsann.2020.0133] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Affiliation(s)
- A Thacoor
- Leeds Teaching Hospitals NHS Trust, Leeds, UK
- Pan-Thames London Plastic and Reconstructive Surgery Rotation, London, UK
| | - S Pathak
- Leeds Teaching Hospitals NHS Trust, Leeds, UK
| | | | - AM Smith
- Leeds Teaching Hospitals NHS Trust, Leeds, UK
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Smith AM, Natowicz MR, Braas D, Ludwig MA, Ney DM, Donley ELR, Burrier RE, Amaral DG. A Metabolomics Approach to Screening for Autism Risk in the Children's Autism Metabolome Project. Autism Res 2020; 13:1270-1285. [PMID: 32558271 PMCID: PMC7496373 DOI: 10.1002/aur.2330] [Citation(s) in RCA: 31] [Impact Index Per Article: 7.8] [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: 04/01/2020] [Revised: 05/28/2020] [Accepted: 06/03/2020] [Indexed: 12/18/2022]
Abstract
Autism spectrum disorder (ASD) is biologically and behaviorally heterogeneous. Delayed diagnosis of ASD is common and problematic. The complexity of ASD and the low sensitivity of available screening tools are key factors in delayed diagnosis. Identification of biomarkers that reduce complexity through stratification into reliable subpopulations can assist in earlier diagnosis, provide insight into the biology of ASD, and potentially suggest targeted interventions. Quantitative metabolomic analysis was performed on plasma samples from 708 fasting children, aged 18 to 48 months, enrolled in the Children's Autism Metabolome Project (CAMP). The primary goal was to identify alterations in metabolism helpful in stratifying ASD subjects into subpopulations with shared metabolic phenotypes (i.e., metabotypes). Metabotypes associated with ASD were identified in a discovery set of 357 subjects. The reproducibility of the metabotypes was validated in an independent replication set of 351 CAMP subjects. Thirty-four candidate metabotypes that differentiated subsets of ASD from typically developing participants were identified with sensitivity of at least 5% and specificity greater than 95%. The 34 metabotypes formed six metabolic clusters based on ratios of either lactate or pyruvate, succinate, glycine, ornithine, 4-hydroxyproline, or α-ketoglutarate with other metabolites. Optimization of a subset of new and previously defined metabotypes into a screening battery resulted in 53% sensitivity (95% confidence interval [CI], 48%-57%) and 91% specificity (95% CI, 86%-94%). Thus, our metabolomic screening tool detects more than 50% of the autistic participants in the CAMP study. Further development of this metabolomic screening approach may facilitate earlier referral and diagnosis of ASD and, ultimately, more targeted treatments. LAY SUMMARY: Analysis of a selected set of metabolites in blood samples from children with autism and typically developing children identified reproducible differences in the metabolism of about half of the children with autism. Testing for these differences in blood samples can be used to help screen children as young as 18 months for risk of autism that, in turn, can facilitate earlier diagnoses. In addition, differences may lead to biological insights that produce more precise treatment options. We are exploring other blood-based molecules to determine if still a higher percentage of children with autism can be detected using this strategy. Autism Res 2020, 13: 1270-1285. © 2020 The Authors. Autism Research published by International Society for Autism Research published by Wiley Periodicals LLC.
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Affiliation(s)
- Alan M Smith
- Stemina Biomarker Discovery, Inc, Madison, Wisconsin, USA
| | - Marvin R Natowicz
- Pathology and Laboratory Medicine, Genomics, Neurology, and Pediatrics Institutes, Cleveland Clinic, Cleveland, Ohio, USA
| | - Daniel Braas
- Stemina Biomarker Discovery, Inc, Madison, Wisconsin, USA
| | | | - Denise M Ney
- Department of Nutritional Sciences, University of Wisconsin-Madison, Madison, Wisconsin, USA
| | | | | | - David G Amaral
- The MIND Institute and Department of Psychiatry and Behavioral Sciences, University of California Davis, Davis, California, USA
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Johnson AH, Bashore L, Hines A, Aufricht J, Smith AM, Pearson H. 0045 Biobehavioral Markers for Sleep/Wake Disturbance and Fatigue in Young Childhood Brain Tumor Survivors. Sleep 2020. [DOI: 10.1093/sleep/zsaa056.044] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Abstract
Introduction
Survivors of childhood and adolescent brain tumors and subsequent treatment may experience many neurological processes involving the forebrain, brainstem, and hypothalamus as well as the symptom cluster of stress, sleep, and fatigue. As a result, the impact of brain tumor treatment (chemotherapy/biotherapy, radiotherapy, and surgery) may have lasting biobehavioral effects. Description of symptoms during early survivorship is not always evident in the literature.
Methods
Convenience sampling and the following inclusion criteria were utilized: brain tumor survivors ages 8–17 years; ≥6 months, <6 years from completion of treatment; disease free or stable disease. Participants completed polysomnography (PSG) followed by a multiple sleep latency test (MSLT), and subjective measures of sleep, fatigue, stress, and pubertal status. Collection of salivary biomarkers for stress (cortisol) and sleep (melatonin) was completed the evening of and morning after the PSG.
Results
Analysis of the first 12 participants (5 males; 3 Hispanic/Latino; average age 14 years; 9–72 months post treatment) revealed mean (minutes) total sleep time (TST) 442, sleep latency (SL) 42 and waking (WASO) 88; sleep efficiency (SE) mean 83%, There were large magnitude correlations between several variables of interest, notably PM Cortisol with fatigue, TST (r= .472; -.453); AM Cortisol with SL (r=.479); AM Melatonin with SE, SL, WASO (r= -.459; .692; .458). Average AM melatonin level (26.6 pg/dl) was higher than PM (6.66 pg/dl). Seven participants were diagnosed with clinical sleep disorders, including one with narcolepsy and two with hypersomnia.
Conclusion
During early survivorship after pediatric brain tumor treatment, survivors may be at high risk for sleep/wake disturbance (SWD). Morning melatonin and biomarker correlations with sleep and fatigue in this sample warrant further exploration and may be related to first night effect versus circadian rhythm differences or clinical sleep disorder. Recommendations for future practice include developmentally matched protocols and routine screening of biobehavioral markers to assess risk for stress, SWD, and fatigue.
Support
1. Center for Oncology Education and Research Harris College of Nursing & Health Sciences Texas Christian University 2. Neuro-Oncology Program Hematology/Oncology Center Cook Children’s Health Care System 3. Nursing Research and Evidence-Based Practice James A. “Buddy” Davidson Endowed Fund
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Affiliation(s)
| | - L Bashore
- Texas Christian University, Fort Worth, TX
- Cook Children’s Medical Center, Fort Worth, TX
| | - A Hines
- Cook Children’s Medical Center, Fort Worth, TX
| | - J Aufricht
- Texas Christian University, Fort Worth, TX
| | - A M Smith
- Sam Houston State University, The Woodlands, TX
| | - H Pearson
- Cook Children’s Medical Center, Fort Worth, TX
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Dyonisius MN, Petrenko VV, Smith AM, Hua Q, Yang B, Schmitt J, Beck J, Seth B, Bock M, Hmiel B, Vimont I, Menking JA, Shackleton SA, Baggenstos D, Bauska TK, Rhodes RH, Sperlich P, Beaudette R, Harth C, Kalk M, Brook EJ, Fischer H, Severinghaus JP, Weiss RF. Old carbon reservoirs were not important in the deglacial methane budget. Science 2020; 367:907-910. [PMID: 32079770 DOI: 10.1126/science.aax0504] [Citation(s) in RCA: 34] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2019] [Accepted: 01/06/2020] [Indexed: 11/02/2022]
Abstract
Permafrost and methane hydrates are large, climate-sensitive old carbon reservoirs that have the potential to emit large quantities of methane, a potent greenhouse gas, as the Earth continues to warm. We present ice core isotopic measurements of methane (Δ14C, δ13C, and δD) from the last deglaciation, which is a partial analog for modern warming. Our results show that methane emissions from old carbon reservoirs in response to deglacial warming were small (<19 teragrams of methane per year, 95% confidence interval) and argue against similar methane emissions in response to future warming. Our results also indicate that methane emissions from biomass burning in the pre-Industrial Holocene were 22 to 56 teragrams of methane per year (95% confidence interval), which is comparable to today.
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Affiliation(s)
- M N Dyonisius
- Department of Earth and Environmental Sciences, University of Rochester, Rochester, NY 14627, USA.
| | - V V Petrenko
- Department of Earth and Environmental Sciences, University of Rochester, Rochester, NY 14627, USA
| | - A M Smith
- Australian Nuclear Science and Technology Organisation (ANSTO), Lucas Heights, NSW 2234, Australia
| | - Q Hua
- Australian Nuclear Science and Technology Organisation (ANSTO), Lucas Heights, NSW 2234, Australia
| | - B Yang
- Australian Nuclear Science and Technology Organisation (ANSTO), Lucas Heights, NSW 2234, Australia
| | - J Schmitt
- Climate and Environmental Physics, Physics Institute and Oeschger Centre for Climate Change Research, University of Bern, CH-3012 Bern, Switzerland
| | - J Beck
- Climate and Environmental Physics, Physics Institute and Oeschger Centre for Climate Change Research, University of Bern, CH-3012 Bern, Switzerland
| | - B Seth
- Climate and Environmental Physics, Physics Institute and Oeschger Centre for Climate Change Research, University of Bern, CH-3012 Bern, Switzerland
| | - M Bock
- Climate and Environmental Physics, Physics Institute and Oeschger Centre for Climate Change Research, University of Bern, CH-3012 Bern, Switzerland
| | - B Hmiel
- Department of Earth and Environmental Sciences, University of Rochester, Rochester, NY 14627, USA
| | - I Vimont
- Institute of Arctic and Alpine Research, University of Colorado Boulder, Boulder, CO 80303, USA
| | - J A Menking
- College of Earth, Ocean and Atmospheric Sciences, Oregon State University, Corvallis, OR 97331, USA
| | - S A Shackleton
- Scripps Institution of Oceanography (SIO), University of California, San Diego, La Jolla, CA 92037, USA
| | - D Baggenstos
- Climate and Environmental Physics, Physics Institute and Oeschger Centre for Climate Change Research, University of Bern, CH-3012 Bern, Switzerland.,Scripps Institution of Oceanography (SIO), University of California, San Diego, La Jolla, CA 92037, USA
| | - T K Bauska
- College of Earth, Ocean and Atmospheric Sciences, Oregon State University, Corvallis, OR 97331, USA.,British Antarctic Survey High Cross, Cambridge CB3 0ET, UK
| | - R H Rhodes
- College of Earth, Ocean and Atmospheric Sciences, Oregon State University, Corvallis, OR 97331, USA.,Department of Earth Sciences, University of Cambridge, Cambridge CB2 3EQ, UK
| | - P Sperlich
- National Institute of Water and Atmospheric Research (NIWA), 6021 Wellington, New Zealand
| | - R Beaudette
- Scripps Institution of Oceanography (SIO), University of California, San Diego, La Jolla, CA 92037, USA
| | - C Harth
- Scripps Institution of Oceanography (SIO), University of California, San Diego, La Jolla, CA 92037, USA
| | - M Kalk
- College of Earth, Ocean and Atmospheric Sciences, Oregon State University, Corvallis, OR 97331, USA
| | - E J Brook
- College of Earth, Ocean and Atmospheric Sciences, Oregon State University, Corvallis, OR 97331, USA
| | - H Fischer
- Climate and Environmental Physics, Physics Institute and Oeschger Centre for Climate Change Research, University of Bern, CH-3012 Bern, Switzerland
| | - J P Severinghaus
- Scripps Institution of Oceanography (SIO), University of California, San Diego, La Jolla, CA 92037, USA
| | - R F Weiss
- Scripps Institution of Oceanography (SIO), University of California, San Diego, La Jolla, CA 92037, USA
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Ward A, Walton K, Stoycheva S, Wallis M, Adebisi A, Nep E, Ngwuluka NC, Shaboun S, Smith AM, Conway BR, Asare-Addo K. The use of visible and UV dissolution imaging for the assessment of propranolol hydrochloride in liquisolid compacts of Sesamum radiatum gum. J Drug Deliv Sci Technol 2020. [DOI: 10.1016/j.jddst.2020.101511] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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Nep EI, Kaur N, Shaboun S, Adebisi AO, Smith AM, Conway BR, Asare-Addo K. Mechanical and release behaviour of theophylline from matrix tablets containing psyllium powder in combination with grewia polysaccharides. Colloids Surf B Biointerfaces 2020; 188:110809. [PMID: 31972440 DOI: 10.1016/j.colsurfb.2020.110809] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2019] [Revised: 01/08/2020] [Accepted: 01/16/2020] [Indexed: 10/25/2022]
Abstract
This study was aimed at investigating the effect of grewia polysaccharides on the mechanical and release properties of tablet matrices containing binary mixtures of the polysaccharide with psyllium. Two grades of grewia polysaccharides (GG and GDS) were extracted and binary mixtures of the polysaccharides with psyllium were formulated into tablet matrices containing theophylline as the model drug. The true, bulk and tapped densities, Carr's compressibility index of the powders and binary composites were determined before tablet compression. Tablet properties (hardness, porosity, and drug release from the matrices) were investigated. The dissolution test was carried out in 0.1 M HCl (pH 1.2) and phosphate buffer (pH 6.8). The results show that GG and GDS produced tablets with good mechanical strength (108.33 N and 95.70 N, respectively) while psyllium produced softer tablets (7.13 N). The combination of psyllium and grewia polysaccharides in the matrices resulted in a significant increase in the mechanical strength of the matrices when compared to matrices containing psyllium alone as the matrix former. The results also showed that GG and GDS reduced the dissolution rate and effectively eliminated the burst release of theophylline from the psyllium matrices at both pHs. The matrices of GG or GDS and the binary mixtures conform to non-Fickian anomalous diffusion with n > 0.45. When overcoming the burst release of drug from matrices such as psyllium, grewia polysaccharides may provide an effective reduction and a more sustained drug release from such matrices.
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Affiliation(s)
- E I Nep
- Department of Pharmacy, University of Huddersfield, Queensgate, Huddersfield, HD1, 3DH, UK; Department of Pharmaceutics and Pharmaceutical Technology, Faculty of Pharmaceutical Science, University of Jos, PMB 2084, Jos, 930001, Nigeria
| | - N Kaur
- Department of Pharmacy, University of Huddersfield, Queensgate, Huddersfield, HD1, 3DH, UK
| | - S Shaboun
- Department of Pharmacy, University of Huddersfield, Queensgate, Huddersfield, HD1, 3DH, UK; Pharmaceutical Chemistry Department, Faculty of Pharmacy, University of Benghazi, Libya
| | - A O Adebisi
- Department of Pharmacy, University of Huddersfield, Queensgate, Huddersfield, HD1, 3DH, UK
| | - A M Smith
- Department of Pharmacy, University of Huddersfield, Queensgate, Huddersfield, HD1, 3DH, UK
| | - B R Conway
- Department of Pharmacy, University of Huddersfield, Queensgate, Huddersfield, HD1, 3DH, UK
| | - K Asare-Addo
- Department of Pharmacy, University of Huddersfield, Queensgate, Huddersfield, HD1, 3DH, UK.
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Scifo A, Kuitems M, Neocleous A, Pope BJS, Miles D, Jansma E, Doeve P, Smith AM, Miyake F, Dee MW. Radiocarbon Production Events and their Potential Relationship with the Schwabe Cycle. Sci Rep 2019; 9:17056. [PMID: 31745128 PMCID: PMC6863917 DOI: 10.1038/s41598-019-53296-x] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2019] [Accepted: 10/24/2019] [Indexed: 11/09/2022] Open
Abstract
Extreme cosmic radiation events occurred in the years 774/5 and 993/4 CE, as revealed by anomalies in the concentration of radiocarbon in known-age tree-rings. Most hypotheses point towards intense solar storms as the cause for these events, although little direct experimental support for this claim has thus far come to light. In this study, we perform very high-precision accelerator mass spectrometry (AMS) measurements on dendrochronological tree-rings spanning the years of the events of interest, as well as the Carrington Event of 1859 CE, which is recognized as an extreme solar storm even though it did not generate an anomalous radiocarbon signature. Our data, comprising 169 new and previously published measurements, appear to delineate the modulation of radiocarbon production due to the Schwabe (11-year) solar cycle. Moreover, they suggest that all three events occurred around the maximum of the solar cycle, adding experimental support for a common solar origin.
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Affiliation(s)
- A Scifo
- University of Groningen, Centre for Isotope Research, Nijenborgh 6, 9747AG, Groningen, The Netherlands.
| | - M Kuitems
- University of Groningen, Centre for Isotope Research, Nijenborgh 6, 9747AG, Groningen, The Netherlands
| | - A Neocleous
- University of Cyprus, Department of Computer Science, 1 University Avenue, 2109, Aglantzia, Cyprus
| | - B J S Pope
- NASA Sagan Fellow, Center for Cosmology and Particle Physics and Center for Data Science, New York, NY, USA
| | - D Miles
- Oxford University, Oxford Dendrochronology Laboratory, Mill Farm, Mapledurham, Oxfordshire, RG4 7TX, United Kingdom
| | - E Jansma
- Cultural Heritage Agency of The Netherlands, Smallepad 5, 3811 MG, Amersfoort, The Netherlands
| | - P Doeve
- Cultural Heritage Agency of The Netherlands, Smallepad 5, 3811 MG, Amersfoort, The Netherlands
| | - A M Smith
- Australian Nuclear Science and Technology Organisation (ANSTO), New Illawarra Rd, Lucas Heights, NSW, 2234, Australia
| | - F Miyake
- Nagoya University, Institute for Space-Earth Environmental Research, Chikusa-ku, Nagoya, 464-8601, Japan
| | - M W Dee
- University of Groningen, Centre for Isotope Research, Nijenborgh 6, 9747AG, Groningen, The Netherlands
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Barbosa JA, Al-Kauraishi MM, Smith AM, Conway BR, Merchant HA. Achieving gastroresistance without coating: Formulation of capsule shells from enteric polymers. Eur J Pharm Biopharm 2019; 144:174-179. [DOI: 10.1016/j.ejpb.2019.09.015] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2019] [Revised: 09/13/2019] [Accepted: 09/17/2019] [Indexed: 10/26/2022]
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Yousaf M, Nirwan JS, Smith AM, Timmins P, Conway BR, Ghori MU. Raft‐forming polysaccharides for the treatment of gastroesophageal reflux disease (GORD): Systematic review. J Appl Polym Sci 2019. [DOI: 10.1002/app.48012] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Maria Yousaf
- Department of Pharmacy, School of Applied ScienceUniversity of Huddersfield Huddersfield HD1 3DH United Kingdom
| | - Jorabar Singh Nirwan
- Department of Pharmacy, School of Applied ScienceUniversity of Huddersfield Huddersfield HD1 3DH United Kingdom
| | - Alan M. Smith
- Department of Pharmacy, School of Applied ScienceUniversity of Huddersfield Huddersfield HD1 3DH United Kingdom
| | - Peter Timmins
- Department of Pharmacy, School of Applied ScienceUniversity of Huddersfield Huddersfield HD1 3DH United Kingdom
| | - Barbara R. Conway
- Department of Pharmacy, School of Applied ScienceUniversity of Huddersfield Huddersfield HD1 3DH United Kingdom
| | - Muhammad Usman Ghori
- Department of Pharmacy, School of Applied ScienceUniversity of Huddersfield Huddersfield HD1 3DH United Kingdom
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Fung TM, Gallego Lazo C, Smith AM. Elasticity and energy dissipation in the double network hydrogel adhesive of the slug Arion subfuscus. Philos Trans R Soc Lond B Biol Sci 2019; 374:20190201. [PMID: 31495311 DOI: 10.1098/rstb.2019.0201] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
The slug Arion subfuscus produces a mucus-based defensive secretion that is remarkably tough. This glue appears to be a double network hydrogel, gaining its toughness through the synergistic actions of two networks of polymers, a relatively stiff network and a relatively deformable network. The double network mechanism has great potential to guide the development of synthetic adhesives. Mechanical tests were performed to analyse key predictions of the mechanism. Stress relaxation tests and tensile tests support the presence of stable cross-links. Cyclic stress-strain tests demonstrate that the glue dissipates a great deal of energy through the failure of these cross-links as sacrificial bonds. Energy dissipation by failure of sacrificial bonds rather than viscous processes is supported by the minimal effect of the time course of the experiments on the measured properties. These sacrificial bonds appear able to reform within minutes after failure. Finally, the glue's stiffness decreases at pH values below 5.5, whereas magnesium and calcium rapidly dissociate from the glue at all pH values tested. Thus, these ions may not be the primary cross-linkers generating the glue's stiffness. This article is part of the theme issue 'Transdisciplinary approaches to the study of adhesion and adhesives in biological systems'.
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Affiliation(s)
- T-M Fung
- Department of Biology, Ithaca College, 953 Danby Road, Ithaca, NY 14850, USA
| | - C Gallego Lazo
- Department of Biology, Ithaca College, 953 Danby Road, Ithaca, NY 14850, USA
| | - A M Smith
- Department of Biology, Ithaca College, 953 Danby Road, Ithaca, NY 14850, USA
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Thacoor A, Pike TW, Pathak S, Dixon J, Macutkiewicz C, Smith AM. The role of intraoperative cholangiography in patients undergoing laparoscopic cholecystectomy for acute gallstone pancreatitis: is magnetic resonance cholangiopancreatography needed? Ann R Coll Surg Engl 2019; 101:428-431. [PMID: 31155897 DOI: 10.1308/rcsann.2019.0049] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
INTRODUCTION Intraoperative cholangiography is sporadically used in patients undergoing laparoscopic cholecystectomy to delineate common bile duct anatomy and exclude retained stones. In patients with acute gallstone pancreatitis, intraoperative cholangiography may reduce the need for preoperative magnetic resonance cholangiopancreatography. MATERIALS AND METHODS A retrospective review of a prospectively collected patient database was undertaken over a 15-year period. The primary objective was to evaluate intraoperative assessment of the common bile duct with intraoperative cholangiography in patients with acute gallstone pancreatitis. RESULTS A total of 2215 patients underwent laparoscopic cholecystectomy between October 1998 and December 2013; 113 patients (of whom 77 were women) with a mean age of 54 years (range 16-88 years) were diagnosed with acute gallstone pancreatitis. Of these, 102 patients (90%) underwent laparoscopic cholecystectomy with intraoperative cholangiography, which was normal in 89 cases. Thirteen patients had choledocholithiasis on intraoperative cholangiography, 11 of whom were managed with concomitant trans-cystic duct exploration and clearance. Two patients required postoperative endoscopic retrograde cholangiopancreatography. CONCLUSIONS In patients diagnosed with acute gallstone pancreatitis, it is reasonable to proceed directly to surgery using intraoperative cholangiography on the same admission as the definitive assessment of the common bile duct. This negates the need for magnetic resonance cholangiopancreatography and can translate into cost savings and reduced length of stay.
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Affiliation(s)
- A Thacoor
- Department of Vascular Surgery, Leeds Teaching Hospitals NHS Trust , Leeds , UK
| | - T W Pike
- Department of HPB and Transplant Surgery, Leeds Teaching Hospitals NHS Trust , Leeds , UK
| | - S Pathak
- Department of HPB and Transplant Surgery, Leeds Teaching Hospitals NHS Trust , Leeds , UK
| | - J Dixon
- School of Medicine, University of Leeds , Leeds , UK
| | - C Macutkiewicz
- Department of HPB Surgery, Manchester University NHS Foundation Trust, Manchester Royal Infirmary, Oxford Road , Manchester , UK
| | - A M Smith
- Department of HPB and Transplant Surgery, Leeds Teaching Hospitals NHS Trust , Leeds , UK
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Smith AM, Donley ELR, Burrier RE, King JJ, Amaral DG. Reply to: Lack of Diagnostic Utility of "Amino Acid Dysregulation Metabotypes". Biol Psychiatry 2019; 85:e43-e44. [PMID: 30595230 DOI: 10.1016/j.biopsych.2018.11.013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/14/2018] [Accepted: 11/16/2018] [Indexed: 11/18/2022]
Affiliation(s)
- Alan M Smith
- Stemina Biomarker Discovery, Inc., Madison, Wisconsin
| | | | | | - Joseph J King
- Stemina Biomarker Discovery, Inc., Madison, Wisconsin
| | - David G Amaral
- Medical Investigation of Neurodevelopmental Disorders (MIND) Institute, University of California, Davis, Davis, California; Department of Psychiatry and Behavioral Sciences, University of California, Davis, Davis, California.
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Smith AM, King JJ, West PR, Ludwig MA, Donley ELR, Burrier RE, Amaral DG. Amino Acid Dysregulation Metabotypes: Potential Biomarkers for Diagnosis and Individualized Treatment for Subtypes of Autism Spectrum Disorder. Biol Psychiatry 2019; 85:345-354. [PMID: 30446206 PMCID: PMC6837735 DOI: 10.1016/j.biopsych.2018.08.016] [Citation(s) in RCA: 78] [Impact Index Per Article: 15.6] [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: 03/16/2018] [Revised: 08/03/2018] [Accepted: 08/22/2018] [Indexed: 02/07/2023]
Abstract
BACKGROUND Autism spectrum disorder (ASD) is behaviorally and biologically heterogeneous and likely represents a series of conditions arising from different underlying genetic, metabolic, and environmental factors. There are currently no reliable diagnostic biomarkers for ASD. Based on evidence that dysregulation of branched-chain amino acids (BCAAs) may contribute to the behavioral characteristics of ASD, we tested whether dysregulation of amino acids (AAs) was a pervasive phenomenon in individuals with ASD. This is the first article to report results from the Children's Autism Metabolome Project (CAMP), a large-scale effort to define autism biomarkers based on metabolomic analyses of blood samples from young children. METHODS Dysregulation of AA metabolism was identified by comparing plasma metabolites from 516 children with ASD with those from 164 age-matched typically developing children recruited into the CAMP. ASD subjects were stratified into subpopulations based on shared metabolic phenotypes associated with BCAA dysregulation. RESULTS We identified groups of AAs with positive correlations that were, as a group, negatively correlated with BCAA levels in ASD. Imbalances between these two groups of AAs identified three ASD-associated amino acid dysregulation metabotypes. The combination of glutamine, glycine, and ornithine amino acid dysregulation metabotypes identified a dysregulation in AA/BCAA metabolism that is present in 16.7% of the CAMP subjects with ASD and is detectable with a specificity of 96.3% and a positive predictive value of 93.5% within the ASD subject cohort. CONCLUSIONS Identification and utilization of metabotypes of ASD can lead to actionable metabolic tests that support early diagnosis and stratification for targeted therapeutic interventions.
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Affiliation(s)
- Alan M. Smith
- Stemina Biomarker Discovery Inc., 504 S. Rosa Rd., Suite 150, Madison, WI 53719
| | - Joseph J. King
- Stemina Biomarker Discovery Inc., 504 S. Rosa Rd., Suite 150, Madison, WI 53719
| | - Paul R. West
- Stemina Biomarker Discovery Inc., 504 S. Rosa Rd., Suite 150, Madison, WI 53719
| | - Michael A. Ludwig
- Stemina Biomarker Discovery Inc., 504 S. Rosa Rd., Suite 150, Madison, WI 53719
| | | | - Robert E. Burrier
- Stemina Biomarker Discovery Inc., 504 S. Rosa Rd., Suite 150, Madison, WI 53719
| | - David G. Amaral
- The MIND Institute and Department of Psychiatry and Behavioral Sciences, University of California Davis, Davis, CA, USA
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Hejjaji EMA, Smith AM, Morris GA. Evaluation of the mucoadhesive properties of chitosan nanoparticles prepared using different chitosan to tripolyphosphate (CS:TPP) ratios. Int J Biol Macromol 2018; 120:1610-1617. [PMID: 30282010 DOI: 10.1016/j.ijbiomac.2018.09.185] [Citation(s) in RCA: 62] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2018] [Revised: 09/03/2018] [Accepted: 09/28/2018] [Indexed: 12/17/2022]
Abstract
Mucoadhesive molecules such as chitosan, can allow targeting of a particular tissue to prolong residence time and subsequently improve bioavailability. The purpose of this study was to investigate chitosan-tripolyphosphate (CS:TPP) nanoparticles and to evaluate the interaction between nanoparticles of different CS:TPP ratios with mucin using viscosity, particle size analysis and ζ-potential. For all CS:TPP ratios examined, a minimum value of viscosity was reached for a 3:1 CS:TPP ratio, however chitosan nanoparticles at this ratio were not stable (<+30 mV), whereas a CS:TPP ratio of 4:1 displayed the strongest interaction. This suggests a minimum CS:TPP ratio of 4:1 is required to produce stable nanoparticles able to form strong interactions, which is consistent with a greater mucin binding efficiencies at CS:TPP ratios of 4:1 and higher, which were quantified using a colorimetric assay. Further analysis of similar systems could lead potentially to tuneable chitosan nanoparticles for specific applications.
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Affiliation(s)
- Ezzeddin M A Hejjaji
- Department of Chemical Sciences, School of Applied Sciences, University of Huddersfield, Huddersfield HD1 3DH, UK; Department of Pharmacy, School of Applied Sciences, University of Huddersfield, Huddersfield HD1 3DH, UK
| | - Alan M Smith
- Department of Pharmacy, School of Applied Sciences, University of Huddersfield, Huddersfield HD1 3DH, UK
| | - Gordon A Morris
- Department of Chemical Sciences, School of Applied Sciences, University of Huddersfield, Huddersfield HD1 3DH, UK.
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Sims IM, Smith AM, Morris GA, Ghori MU, Carnachan SM. Structural and rheological studies of a polysaccharide mucilage from lacebark leaves (Hoheria populnea A. Cunn.). Int J Biol Macromol 2018; 111:839-847. [DOI: 10.1016/j.ijbiomac.2017.12.142] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2017] [Revised: 11/17/2017] [Accepted: 12/27/2017] [Indexed: 12/01/2022]
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Shechonge A, Ngatunga BP, Bradbeer SJ, Day JJ, Freer JJ, Ford AGP, Kihedu J, Richmond T, Mzighani S, Smith AM, Sweke EA, Tamatamah R, Tyers AM, Turner GF, Genner MJ. Widespread colonisation of Tanzanian catchments by introduced Oreochromis tilapia fishes: the legacy from decades of deliberate introduction. Hydrobiologia 2018; 832:235-253. [PMID: 30880833 PMCID: PMC6394791 DOI: 10.1007/s10750-018-3597-9] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/18/2017] [Revised: 03/09/2018] [Accepted: 03/16/2018] [Indexed: 06/09/2023]
Abstract
From the 1950s onwards, programmes to promote aquaculture and improve capture fisheries in East Africa have relied heavily on the promise held by introduced species. In Tanzania these introductions have been poorly documented. Here we report the findings of surveys of inland water bodies across Tanzania between 2011 and 2017 that clarify distributions of tilapiine cichlids of the genus Oreochromis. We identified Oreochromis from 123 sampling locations, including 14 taxa restricted to their native range and three species that have established populations beyond their native range. Of these three species, the only exotic species found was blue-spotted tilapia (Oreochromis leucostictus), while Nile tilapia (Oreochromis niloticus) and Singida tilapia (Oreochromis esculentus), which are both naturally found within the country of Tanzania, have been translocated beyond their native range. Using our records, we developed models of suitable habitat for the introduced species based on recent (1960-1990) and projected (2050, 2070) East African climate. These models indicated that presence of suitable habitat for these introduced species will persist and potentially expand across the region. The clarification of distributions provided here can help inform the monitoring and management of biodiversity, and inform policy related to the future role of introduced species in fisheries and aquaculture.
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Affiliation(s)
- Asilatu Shechonge
- Department of Aquatic Sciences and Fisheries, University of Dar es Salaam, P.O. Box 35064, Dar es Salaam, Tanzania
- Tanzania Fisheries Research Institute (TAFIRI), P.O. Box 9750, Dar es Salaam, Tanzania
| | - Benjamin P. Ngatunga
- Department of Aquatic Sciences and Fisheries, University of Dar es Salaam, P.O. Box 35064, Dar es Salaam, Tanzania
| | - Stephanie J. Bradbeer
- School of Biological Sciences, University of Bristol, Life Sciences Building, 24 Tyndall Avenue, Bristol, BS8 1TQ UK
| | - Julia J. Day
- Department of Genetics, Evolution and Environment, University College London, Darwin Building, Gower Street, London, WC1E 6BT UK
| | - Jennifer J. Freer
- School of Biological Sciences, University of Bristol, Life Sciences Building, 24 Tyndall Avenue, Bristol, BS8 1TQ UK
| | - Antonia G. P. Ford
- School of Biological Sciences, Bangor University, Bangor, Gwynedd LL57 2UW UK
- Department of Life Sciences, Centre for Research in Ecology, Whitelands College, University of Roehampton, Holybourne Avenue, London, SW15 4JD UK
| | - Jonathan Kihedu
- Tanzania Fisheries Research Institute (TAFIRI), P.O. Box 9750, Dar es Salaam, Tanzania
| | - Tabitha Richmond
- School of Biological Sciences, University of Bristol, Life Sciences Building, 24 Tyndall Avenue, Bristol, BS8 1TQ UK
| | - Semvua Mzighani
- Tanzania Fisheries Research Institute (TAFIRI), P.O. Box 9750, Dar es Salaam, Tanzania
| | - Alan M. Smith
- Evolutionary and Environmental Genomics Group, School of Environmental Sciences, University of Hull, Hull, HU5 7RX UK
| | - Emmanuel A. Sweke
- Tanzania Fisheries Research Institute (TAFIRI), P.O. Box 9750, Dar es Salaam, Tanzania
| | - Rashid Tamatamah
- Department of Aquatic Sciences and Fisheries, University of Dar es Salaam, P.O. Box 35064, Dar es Salaam, Tanzania
- Tanzania Fisheries Research Institute (TAFIRI), P.O. Box 9750, Dar es Salaam, Tanzania
| | - Alexandra M. Tyers
- School of Biological Sciences, Bangor University, Bangor, Gwynedd LL57 2UW UK
| | - George F. Turner
- School of Biological Sciences, Bangor University, Bangor, Gwynedd LL57 2UW UK
| | - Martin J. Genner
- School of Biological Sciences, University of Bristol, Life Sciences Building, 24 Tyndall Avenue, Bristol, BS8 1TQ UK
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Cooke ME, Jones SW, Ter Horst B, Moiemen N, Snow M, Chouhan G, Hill LJ, Esmaeli M, Moakes RJA, Holton J, Nandra R, Williams RL, Smith AM, Grover LM. Structuring of Hydrogels across Multiple Length Scales for Biomedical Applications. Adv Mater 2018; 30:e1705013. [PMID: 29430770 DOI: 10.1002/adma.201705013] [Citation(s) in RCA: 45] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/02/2017] [Revised: 10/20/2017] [Indexed: 06/08/2023]
Abstract
The development of new materials for clinical use is limited by an onerous regulatory framework, which means that taking a completely new material into the clinic can make translation economically unfeasible. One way to get around this issue is to structure materials that are already approved by the regulator, such that they exhibit very distinct physical properties and can be used in a broader range of clinical applications. Here, the focus is on the structuring of soft materials at multiple length scales by modifying processing conditions. By applying shear to newly forming materials, it is possible to trigger molecular reorganization of polymer chains, such that they aggregate to form particles and ribbon-like structures. These structures then weakly interact at zero shear forming a solid-like material. The resulting self-healing network is of particular use for a range of different biomedical applications. How these materials are used to allow the delivery of therapeutic entities (cells and proteins) and as a support for additive layer manufacturing of larger-scale tissue constructs is discussed. This technology enables the development of a range of novel materials and structures for tissue augmentation and regeneration.
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Affiliation(s)
- Megan E Cooke
- School of Chemical Engineering, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
- Institute of Inflammation and Ageing, MRC Musculoskeletal Ageing Centre, QE Hospital, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
| | - Simon W Jones
- Institute of Inflammation and Ageing, MRC Musculoskeletal Ageing Centre, QE Hospital, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
| | - Britt Ter Horst
- School of Chemical Engineering, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
- Scar Free Foundation Centre for Burns Research, QE Hospital, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
| | - Naiem Moiemen
- Scar Free Foundation Centre for Burns Research, QE Hospital, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
| | - Martyn Snow
- School of Chemical Engineering, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
| | - Gurpreet Chouhan
- School of Chemical Engineering, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
| | - Lisa J Hill
- Institute of Inflammation and Ageing, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
| | - Maryam Esmaeli
- Institute of Inflammation and Ageing, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
| | - Richard J A Moakes
- School of Chemical Engineering, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
| | - James Holton
- School of Chemical Engineering, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
| | - Rajpal Nandra
- School of Chemical Engineering, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
| | - Richard L Williams
- School of Chemical Engineering, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
| | - Alan M Smith
- Department of Pharmacy, University of Huddersfield, Queensgate, Huddersfield, HD1 3DH, UK
| | - Liam M Grover
- School of Chemical Engineering, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
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Diryak R, Kontogiorgos V, Ghori MU, Bills P, Tawfik A, Morris GA, Smith AM. Behavior of In Situ Cross-Linked Hydrogels with Rapid Gelation Kinetics on Contact with Physiological Fluids. MACROMOL CHEM PHYS 2018. [DOI: 10.1002/macp.201700584] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Ramadan Diryak
- Department of Pharmacy; University of Huddersfield; Queensgate Huddersfield HD1 3DH UK
| | - Vassilis Kontogiorgos
- Department of Biological Sciences; School of Computing and Engineering University of Huddersfield; Queensgate Huddersfield HD1 3DH UK
| | - Muhammad U. Ghori
- Department of Pharmacy; University of Huddersfield; Queensgate Huddersfield HD1 3DH UK
| | - Paul Bills
- EPSRC Future Metrology Hub; University of Huddersfield; Queensgate Huddersfield HD1 3DH UK
| | - Ahmed Tawfik
- EPSRC Future Metrology Hub; University of Huddersfield; Queensgate Huddersfield HD1 3DH UK
| | - Gordon A. Morris
- Department of Chemical Sciences; University of Huddersfield; Queensgate Huddersfield HD1 3DH UK
| | - Alan M. Smith
- Department of Pharmacy; University of Huddersfield; Queensgate Huddersfield HD1 3DH UK
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Abstract
Swelling, erosion, deformation, and consolidation properties can affect the performance of cellulose ethers, the most commonly used matrix former in hydrophilic sustained tablet formulations. The present study was designed to comparatively evaluate the swelling, erosion, compression, compaction, and relaxation properties of the cellulose ethers in a comprehensive study using standardised conditions. The interrelationship between various compressional models and the inherent deformation and consolidation properties of the polymers on the derived swelling and erosion parameters are consolidated. The impact of swelling (Kw) on erosion rates (KE) and the inter-relationship between Heckel and Kawakita plasticity constants was also investigated. It is evident from the findings that the increases in both substitution and polymer chain length led to higher Kw, but a lower KE; this was also true for all particle size fractions regardless of polymer grade. Smaller particle size and high substitution levels tend to increase the relative density of the matrix but reduce porosity, yield pressure (Py), Kawakita plasticity parameter (b-1) and elastic relaxation. Both KW versus KE (R2 = 0.949-0.980) and Py versus. b-1 correlations (R2 = 0.820-0.934) were reasonably linear with regards to increasing hydroxypropyl substitution and molecular size. Hence, it can be concluded that the combined knowledge of swelling and erosion kinetics in tandem with the in- and out-of-die compression findings can be used to select a specific polymer grade and further to develop and optimize formulations for oral controlled drug delivery applications.
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Affiliation(s)
- Muhammad U Ghori
- a Department of Pharmacy, School of Applied Sciences , University of Huddersfield , Queensgate , Huddersfield , UK
| | - Liam M Grover
- b School of Chemical Engineering , University of Birmingham , Edgbaston , Birmingham , UK
| | - Kofi Asare-Addo
- a Department of Pharmacy, School of Applied Sciences , University of Huddersfield , Queensgate , Huddersfield , UK
| | - Alan M Smith
- a Department of Pharmacy, School of Applied Sciences , University of Huddersfield , Queensgate , Huddersfield , UK
| | - Barbara R Conway
- a Department of Pharmacy, School of Applied Sciences , University of Huddersfield , Queensgate , Huddersfield , UK
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Ghori MU, Mohammad MA, Rudrangi SRS, Fleming LT, Merchant HA, Smith AM, Conway BR. Impact of purification on physicochemical, surface and functional properties of okra biopolymer. Food Hydrocoll 2017. [DOI: 10.1016/j.foodhyd.2017.02.010] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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