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Dognini P, Chaudhry T, Scagnetti G, Assante M, Hanson GSM, Ross K, Giuntini F, Coxon CR. 5,10,15,20-Tetrakis(pentafluorophenyl)porphyrin as a Functional Platform for Peptide Stapling and Multicyclisation. Chemistry 2023; 29:e202301410. [PMID: 37402229 PMCID: PMC10946732 DOI: 10.1002/chem.202301410] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2023] [Revised: 06/22/2023] [Accepted: 07/04/2023] [Indexed: 07/06/2023]
Abstract
Polyfluorinated aromatic reagents readily react with thiolates via nucleophilic aromatic substitution (SN Ar) and provide excellent scaffolds for peptide cyclisation. Here we report a robust and versatile platform for peptide stapling and multicyclisation templated by 5,10,15,20-tetrakis(pentafluorophenyl)porphyrin, opening the door to the next generation of functional scaffolds for 3D peptide architectures. We demonstrate that stapling and multicyclisation occurs with a range of non-protected peptides under peptide-compatible conditions, exhibiting chemoselectivity and wide-applicability. Peptides containing two cysteine residues are readily stapled, and the remaining perfluoroaryl groups permit the introduction of a second peptide in a modular fashion to access bicyclic peptides. Similarly, peptides with more than two cysteine residues can afford multicyclic products containing up to three peptide 'loops'. Finally, we demonstrate that a porphyrin-templated stapled peptide containing the Skin Penetrating and Cell Entering (SPACE) peptide affords a skin cell penetrating conjugate with intrinsic fluorescence.
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Affiliation(s)
- Paolo Dognini
- School of Pharmacy and Biomolecular SciencesLiverpool John Moores UniversityByrom Street CampusL3 3AFLiverpoolUK
| | - Talhat Chaudhry
- School of Pharmacy and Biomolecular SciencesLiverpool John Moores UniversityByrom Street CampusL3 3AFLiverpoolUK
| | - Giulia Scagnetti
- School of Pharmacy and Biomolecular SciencesLiverpool John Moores UniversityByrom Street CampusL3 3AFLiverpoolUK
| | - Michele Assante
- School of Pharmacy and Biomolecular SciencesLiverpool John Moores UniversityByrom Street CampusL3 3AFLiverpoolUK
| | - George S. M. Hanson
- EaStCHEMSchool of ChemistryThe University of EdinburghJoseph Black Building, David Brewster RoadEH9 3FJEdinburghUK
| | - Kehinde Ross
- School of Pharmacy and Biomolecular SciencesLiverpool John Moores UniversityByrom Street CampusL3 3AFLiverpoolUK
| | - Francesca Giuntini
- School of Pharmacy and Biomolecular SciencesLiverpool John Moores UniversityByrom Street CampusL3 3AFLiverpoolUK
| | - Christopher R. Coxon
- EaStCHEMSchool of ChemistryThe University of EdinburghJoseph Black Building, David Brewster RoadEH9 3FJEdinburghUK
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Chaudhry T, Coxon CR, Ross K. Trading places: Peptide and small molecule alternatives to oligonucleotide-based modulation of microRNA expression. Drug Discov Today 2022; 27:103337. [PMID: 35995360 DOI: 10.1016/j.drudis.2022.08.005] [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: 03/08/2022] [Revised: 06/13/2022] [Accepted: 08/09/2022] [Indexed: 11/03/2022]
Abstract
It is well established that microRNA (miRNA) dysregulation is involved in the development and progression of various diseases, especially cancer. Emerging evidence suggests that small molecule and peptide agents can interfere with miRNA disease pathways. Despite this, very little is known about structural features that drive drug-miRNA interactions and subsequent inhibition. In this review, we highlight the advances made in the development of small molecule and peptide inhibitors of miRNA processing. Specifically, we attempt to draw attention to peptide features that may be critical for interaction with the miRNA secondary structure to regulate miRNA expression. We hope that this review will help to establish peptides as exciting miRNA expression modulators and will contribute towards the development of the first miRNA-targeting peptide therapy.
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Affiliation(s)
- Talhat Chaudhry
- School of Pharmacy and Biomolecular Science, Liverpool John Moores University, Liverpool, UK; Institute for Health Research, Liverpool John Moores University, Liverpool, UK
| | - Christopher R Coxon
- EaStChem School of Chemistry, The University of Edinburgh, Joseph Black Building, David Brewster Road, Edinburgh EH14 4AS, UK
| | - Kehinde Ross
- School of Pharmacy and Biomolecular Science, Liverpool John Moores University, Liverpool, UK; Institute for Health Research, Liverpool John Moores University, Liverpool, UK.
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Rupra R, Malone P, Power D, Chaudhry T. 117 Management of Spinal Accessory Nerve Palsy. Br J Surg 2022. [DOI: 10.1093/bjs/znac039.063] [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: 11/14/2022]
Abstract
Abstract
Aim
To discuss our strategies employed in our peripheral nerve injury unit for spinal accessory nerve (SAN) injury and a potential algorithm for future use.
Method
A retrospective analysis was undertaken on 9 patients with SAN injury undergoing surgical intervention. Neurophysiological results were obtained. MRC grades were compared at presentation and post-operatively. DASH (Disability of the arm, shoulder, and hand) scores were also collected post-operatively.
Results
7 patients presented to us following an iatrogenic injury to the SAN.
6 patients underwent neurolysis only, 3 underwent nerve transfer, 2 underwent nerve grafting (1 autologous, 1 processed nerve allograft).
The mean time frame from presentation to operation was 13 months. MRC grading of shoulder function increased from a mean MRC 2 to 4 at a mean of 8 months post-operatively. DASH scores of the 7 participating patients were 30.8 at a mean of 47 months post-operatively. 2 patients had experienced a sensory deficit.
Conclusions
Nerve grafting allows bridging of a gap when the injury is well defined with a suitable window for re-innervation. Allograft has a role in small gaps where there may be concerns with autograft. Nerve transfer may allow earlier re-innervation and be a more reliable option where the proximal extent of nerve injury is poorly defined. We found nerve wraps to be a useful addition when an injured nerve may be adherent to a heavily scarred bed. We will present some worked examples along with a potential algorithm for a surgical strategy.
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Affiliation(s)
- R. Rupra
- Queen Elizabeth Hospital, Birmingham, United Kingdom
| | - P. Malone
- Queen Elizabeth Hospital, Birmingham, United Kingdom
| | - D. Power
- Queen Elizabeth Hospital, Birmingham, United Kingdom
| | - T. Chaudhry
- Queen Elizabeth Hospital, Birmingham, United Kingdom
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Wates E, Chaudhry T, Hall T. A Rapidly Progressive Melanoma Presenting Initially as a Non-Healing Extraction Socket. J Oral Maxillofac Surg 2020. [DOI: 10.1016/j.joms.2020.07.143] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Dognini P, Killoran PM, Hanson GS, Halsall L, Chaudhry T, Islam Z, Giuntini F, Coxon CR. Using
19
F NMR
and two‐level factorial design to explore thiol‐fluoride substitution in hexafluorobenzene and its application in peptide stapling and cyclisation. Pept Sci (Hoboken) 2020. [DOI: 10.1002/pep2.24182] [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: 11/10/2022]
Affiliation(s)
- Paolo Dognini
- School of Pharmacy and Biomolecular Sciences Byrom Street Campus, Liverpool John Moores University Liverpool UK
| | - Patrick M. Killoran
- Division of Structural Biology (STRUBI) University of Oxford, Rutherford Appleton Laboratory, Harwell Science and Innovation Campus Harwell UK
| | - George S. Hanson
- School of Pharmacy and Biomolecular Sciences Byrom Street Campus, Liverpool John Moores University Liverpool UK
- Institute of Chemical Sciences, School of Engineering and Physical Sciences, Heriot‐Watt University Edinburgh UK
| | - Lewis Halsall
- School of Pharmacy and Biomolecular Sciences Byrom Street Campus, Liverpool John Moores University Liverpool UK
| | - Talhat Chaudhry
- School of Pharmacy and Biomolecular Sciences Byrom Street Campus, Liverpool John Moores University Liverpool UK
| | - Zasharatul Islam
- School of Pharmacy and Biomolecular Sciences Byrom Street Campus, Liverpool John Moores University Liverpool UK
| | - Francesca Giuntini
- School of Pharmacy and Biomolecular Sciences Byrom Street Campus, Liverpool John Moores University Liverpool UK
| | - Christopher R. Coxon
- Institute of Chemical Sciences, School of Engineering and Physical Sciences, Heriot‐Watt University Edinburgh UK
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Gulamhussein MA, Chaudhry S, Noor S, Chaudhry T, Guha A, Knebel R. Safety in out-of-hours operating in trauma and orthopaedics at a district general hospital. Ann R Coll Surg Engl 2017; 99:347-350. [PMID: 27917666 PMCID: PMC5449689 DOI: 10.1308/rcsann.2016.0354] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/24/2016] [Indexed: 11/22/2022] Open
Abstract
INTRODUCTION According to the National Confidential Enquiry into Perioperative Deaths (NCEPOD), out-of-hours operating in trauma and orthopaedics should be reserved for life or limb threatening cases only. The aim of our study was to determine the nature of non-emergency work carried out in our trust at night in 2015. The overall efficacy and clinical safety of the services provided was evaluated. METHODS Surgical activity undertaken after 9pm was reviewed along with patient ASA (American Society of Anesthesiologists) grade, grade of operating surgeon and any complications that occurred following the procedure. Furthermore, the clinical urgency and safety of cases was assessed based on whether there was any record of life or limb threatening indications at the time of admission. RESULTS Overall, 131 procedures were performed after 9pm, with 102 performed between 9pm and midnight, and 29 after midnight. Consultants performed 16 cases and the remaining 115 cases were operated on by middle grades or specialty trainees. A fifth (20%) of the cases were genuinely life or limb threatening. A total of 123 procedures were classed as having good outcomes. The complication rate was 8%. CONCLUSIONS In our study, 80% of the procedures performed after 9pm could not be categorised as life or limb threatening. Appropriate NCEPOD classification would ensure that only life or limb threatening cases were listed for theatre after 9pm. Alternative methods of operating within working hours should be considered.
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Affiliation(s)
| | - S Chaudhry
- Worcestershire Acute Hospitals NHS Trust , UK
| | - S Noor
- Walsall Healthcare NHS Trust , UK
| | - T Chaudhry
- University Hospitals Birmingham NHS Foundation Trust , UK
| | - A Guha
- Worcestershire Acute Hospitals NHS Trust , UK
| | - R Knebel
- Worcestershire Acute Hospitals NHS Trust , UK
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Noor S, Gilson A, Kennedy K, Swanson A, Vanny V, Mony K, Chaudhry T, Gollogly J. Pre-packing of cost effective antibiotic cement beads for the treatment of traumatic osteomyelitis in the developing world - an in-vitro study based in Cambodia. Injury 2016; 47:805-10. [PMID: 26899719 DOI: 10.1016/j.injury.2016.01.038] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/16/2015] [Revised: 01/15/2016] [Accepted: 01/25/2016] [Indexed: 02/02/2023]
Abstract
The developing world often lacks the resources to effectively treat the most serious injuries including osteomyelitis following open fractures or surgical fracture treatment. Antibiotic cement beads are a widely accepted method of delivering antibiotics locally to the infected area following trauma. This study is based in Cambodia, a low income country struggling to recover from a recent genocide. The study aims to test the effectiveness of locally made antibiotic beads and analyse their effectiveness after being gas sterilised, packaged and kept in storage Different antibiotic beads were manufactured locally using bone cement and tested against MRSA bacteria grown from a case of osteomyelitis. Each antibiotic was tested before and after a process of gas sterilisation as well as later being tested after storage in packaging up to 42 days. The gentamicin, vancomycin, amikacin and ceftriaxone beads all inhibited growth of the MRSA on the TSB and agar plates, both before and after gas sterilisation. All four antibiotics continued to show similar zones of inhibition after 42 days of storage. The results show significant promise to produce beads with locally obtainable ingredients in an austere environment and improve cost effectiveness by storing them in a sterilised condition.
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Affiliation(s)
- S Noor
- Childrens Surgical Centre, Cambodia.
| | - A Gilson
- Childrens Surgical Centre, Cambodia
| | | | | | - V Vanny
- Childrens Surgical Centre, Cambodia
| | - K Mony
- Childrens Surgical Centre, Cambodia
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Chaudhry T, Hissaria P, Wiese M, Heddle R, Kette F, Smith WB. Oral drug challenges in non-steroidal anti-inflammatory drug-induced urticaria, angioedema and anaphylaxis. Intern Med J 2012; 42:665-71. [DOI: 10.1111/j.1445-5994.2011.02601.x] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Chaudhry T, Hissaria P, Wiese M, Heddle R, Kette F, Smith WB. Oral drug challenges in non-steroidal anti-inflammatory drug-induced urticaria, angioedema and anaphylaxis. Intern Med J 2012. [DOI: 10.1111/j.1445-5994.2011.02601.x 671] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Chaudhry T, Ghani AM, Mehrali TH, Taylor RS, Brydon PA, Gee H, Barnett AH, Dunne FP. A comparison of foetal and labour outcomes in Caucasian and Afro-Caribbean women with diabetes in pregnancy. Int J Clin Pract 2004; 58:932-6. [PMID: 15587772 DOI: 10.1111/j.1742-1241.2004.00207.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
Abstract
Materno-foetal complications have an increased prevalence in pregnancies complicated by diabetes. Ethnicity and cultural background may further affect these outcomes. In this study, we compared labour and foetal outcomes in Afro-Caribbean and Caucasian women with diabetes in pregnancy, using the Birmingham computerised database of diabetes in pregnancy. A retrospective analysis, covering the period 1990-2002, was employed. Foetal outcomes included early foetal loss, neonatal and perinatal mortality, congenital malformations and infant size at delivery. Labour outcomes assessed were mode and time of delivery. Overall, Afro-Caribbean women achieve similar results to Caucasian women. No significant differences were seen in foetal outcomes between the two cohorts or between diabetic subtypes. Afro-Caribbean women were more likely to have a vaginal delivery, but present later for their first antenatal visit compared with Caucasian women. Variations in culture or access to health care may account for these differences. An awareness of the specific needs of ethnic minorities is essential to ensure that this encouraging trend continues.
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Affiliation(s)
- T Chaudhry
- Department of Medicine, University of Birmingham, Birmingham, UK
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