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Chalmers University of Technology

10 ARTICLES PUBLISHED IN JoVE

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Medicine

MALDI Imaging Mass Spectrometry of Neuropeptides in Parkinson's Disease
Jörg Hanrieder 1,2, Anna Ljungdahl 1, Malin Andersson 1
1Department of Pharmaceutical Biosciences, Uppsala University, 2Department of Chemical and Biological Engineering, Chalmers University of Technology

Dopamine replacement pharmacotherapy using L-DOPA is the most commonly used symptomatic treatment of Parkinson’s disease, but is accompanied by side effects including involuntary abnormal movements, termed dyskinesia 1. Here, a protocol for MALDI imaging mass spectrometry is presented that detects changes in rat brain neuropeptide levels related to dyskinesia.

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Chemistry

Highly Stereoselective Synthesis of 1,6-Ketoesters Mediated by Ionic Liquids: A Three-component Reaction Enabling Rapid Access to a New Class of Low Molecular Weight Gelators
Henrik Sundén 1, Linda Ta 1, Anton Axelsson 1
1Chemistry and Chemical Engineering, Chalmers University of Technology

Ionic liquids (ILs) mediate fast, simple and cheap access to 1,6-ketoesters in high diastereoselectivities and good yields. The reaction protocol is robust and the 1,6-ketoesters can be obtained in gram scale after a simple filtration protocol. Moreover, the 1,6-ketoesters are potent gelators in hydrocarbon solvents.

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Bioengineering

Bioprinting of Cartilage and Skin Tissue Analogs Utilizing a Novel Passive Mixing Unit Technique for Bioink Precellularization
Patrick Scott Thayer 1, Linnea Stridh Orrhult 2,3, Héctor Martínez 2
1CELLINK LLC, 2CELLINK AB, 33D Bioprinting Centre, Department of Chemistry and Chemical Engineering, Chalmers University of Technology

Cartilage and skin analogs were bioprinted using a nanocellulose-alginate based bioink. The bioinks were cellularized prior to printing via a single step passive mixing unit. The constructs were demonstrated to be uniformly cellularized, have high viability, and exhibit favorable markers of differentiation.

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Neuroscience

Monitoring the Effect of Osmotic Stress on Secretory Vesicles and Exocytosis
Hoda Fathali 1, Johan Dunevall 1, Soodabeh Majdi 2, Ann-Sofie Cans 1
1Department of Chemistry and Chemical Engineering, Chalmers University of Technology, 2Department of Chemistry and Molecular Biology, University of Gothenburg

Osmotic stress affects exocytosis and the amount of neurotransmitter released during this process. We demonstrate how combining electrochemical methods together with transmission electron microscopy can be used to study the effect of extracellular osmotic pressure on exocytosis activity, vesicle quantal size, and the amount of neurotransmitter released during exocytosis.

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Biology

Simultaneous Mapping and Quantitation of Ribonucleotides in Human Mitochondrial DNA
Katrin Kreisel 1, Martin K.M. Engqvist 1,2, Anders R. Clausen 1
1Department for Medical Biochemistry and Cell Biology, University of Gothenburg, 2Department of Biology and Biological Engineering, Chalmers University of Technology

Here we describe a method amenable to simultaneously quantitate and genome-wide map ribonucleotides in highly intact DNA at single-nucleotide resolution, combining enzymatic cleavage of genomic DNA with its alkaline hydrolysis and subsequent 5´-end sequencing.

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Chemistry

Membrane Remodeling of Giant Vesicles in Response to Localized Calcium Ion Gradients
Baharan Ali Doosti 1, Ann-Sofie Cans 1, Gavin D.M. Jeffries 1, Tatsiana Lobovkina 1
1Department of Chemistry and Chemical Engineering, Chalmers University of Technology

We present a technique for contactless micromanipulation of vesicles, using localized calcium ion gradients. Microinjection of a calcium ion solution, in the vicinity of a giant lipid vesicle, is utilized to remodel the lipid membrane, resulting in the production of membrane tubular protrusions.

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Education

Construction and Operation of a Light-driven Gold Nanorod Rotary Motor System
Daniel Andrén 1, Pawel Karpinski 1, Mikael Käll 1
1Department of Physics, Chalmers University of Technology

Plasmonic gold nanorods can be trapped in liquids and rotated at kHz frequencies using circularly-polarized optical tweezers. Introducing tools for Brownian dynamics analysis and light scatteringspectroscopy leads to a powerful system for research and application in numerous fields of science.

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Bioengineering

Spontaneous Formation and Rearrangement of Artificial Lipid Nanotube Networks as a Bottom-Up Model for Endoplasmic Reticulum
Elif Senem Köksal 1, Patrícia F. Belletati 1, Ganna Reint 1, Ragni Olsson 1, Kira D. Leitl 1, Ilayda Kantarci 1, Irep Gözen 1,2,3
1Centre for Molecular Medicine Norway, Faculty of Medicine, University of Oslo, 2Department of Chemistry, Faculty of Mathematics and Natural Sciences, University of Oslo, 3Department of Chemistry and Chemical Engineering, Chalmers University of Technology

Solid-supported, protein-free, double phospholipid bilayer membranes (DLBM) can be transformed into complex and dynamic lipid nanotube networks and can serve as 2D bottom-up models of the endoplasmic reticulum.

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Medicine

Regenerative Peripheral Nerve Interface: Surgical Protocol for a Randomized Controlled Trial in Postamputation Pain
Emily Pettersen 1,2,3,4, Paolo Sassu 5, Francesca Alice Pedrini 1,5, Hannes Granberg 1,2, Carina Reinholdt 2,6, Juan Manuel Breyer 7, Aidan Roche 8, Andrew Hart 9,10, Adil Ladak 11, Hollie A. Power 11, Michael Leung 12, Michael Lo 12, Ian Valerio 13, Kyle R. Eberlin 13, Jason Ko 14, Gregory A. Dumanian 14, Theodore A. Kung 15, Paul Cederna 15, Max Ortiz-Catalan 1,4,16,17
1Center for Bionics and Pain Research, 2Center for Advanced Reconstruction of Extremities, Sahlgrenska University Hospital, 3Department of Electrical Engineering, Chalmers University of Technology, 4Bionics Institute, 5IV Clinica Ortoplastica, IRCCS Istituto Ortopedico Rizzoli, 6Department of Hand Surgery, Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg, Sahlgrenska University Hospital, 7Department of Orthopedic Surgery, Hand Unit, Worker Hospital, 8College of Medicine and Veterinary Medicine, The Queen's Medical Research Institute, The University of Edinburgh, 9Canniesburn Plastic Surgery Unit, Glasgow Royal Infirmary, 10College of Medicine, Veterinary & Life Sciences, The University of Glasgow, 11Division of Plastic Surgery, Department of Surgery, Faculty of Medicine and Dentistry, University of Alberta, 12Plastics and Reconstructive Surgery, Dandenong Hospital, Monash Health, 13Division of Plastic and Reconstructive Surgery, Massachusetts General Hospital & Harvard Medical School, 14Division of Plastic Surgery, Department of Surgery, Northwestern Feinberg School of Medicine, 15Section of Plastic Surgery, Department of Surgery, Michigan Medicine, 16Medical Bionics Department, University of Melbourne, 17Prometei Pain Rehabilitation Center

Here, we describe the surgical procedure to perform Regenerative Peripheral Nerve Interface (RPNI) surgery for treating postamputation neuropathic pain in the context of an international, randomized controlled trial (RCT) (ClinicalTrials.gov, NCT05009394). The RCT compares RPNI with two other surgical techniques, namely, Targeted Muscle Reinnervation (TMR) and neuroma excision combined with intra-muscular transposition.

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Medicine

Targeted Muscle Reinnervation: Surgical Protocol for a Randomized Controlled Trial in Postamputation Pain
Emily Pettersen 1,2,3,4, Paolo Sassu 5, Francesca Alice Pedrini 1,5, Hannes Granberg 1,2, Carina Reinholdt 2,6, Juan Manuel Breyer 7, Aidan Roche 8, Andrew Hart 9,10, Adil Ladak 11, Hollie A. Power 11, Michael Leung 12, Michael Lo 12, Ian Valerio 13, Kyle R. Eberlin 13, Theodore A. Kung 14, Paul Cederna 14, Jason M. Souza 15,16, Oskar Aszmann 17, Jason Ko 18, Gregory A. Dumanian 18, Max Ortiz-Catalan 1,4,19,20
1Center for Bionics and Pain Research, 2Center for Advanced Reconstruction of Extremities, Sahlgrenska University Hospital, 3Department of Electrical Engineering, Chalmers University of Technology, 4Bionics Institute, 5IV Clinica Ortoplastica, IRCCS Istituto Ortopedico Rizzoli, 6Department of Hand Surgery, Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg, Sahlgrenska University Hospital, 7Department of Orthopedic, Hand Unit, Worker Hospital, 8College of Medicine and Veterinary Medicine, The Queen's Medical Research Institute, The University of Edinburgh, 9Canniesburn Plastic Surgery Unit, Glasgow Royal Infirmary, 10College of Medicine, Veterinary & Life Sciences, The University of Glasgow, 11Division of Plastic Surgery, Department of Surgery, Faculty of Medicine and Dentistry, University of Alberta, 12Plastics and Reconstructive Surgery, Dandenong Hospital, Monash Health, 13Division of Plastic and Reconstructive Surgery, Massachusetts General Hospital &, Harvard Medical School, 14Section of Plastic Surgery, Department of Surgery, Michigan Medicine, 15Department of Surgery, Uniformed Services University of the Health Sciences and Walter Reed National Military Medical Center, 16Department of Plastic and Reconstructive Surgery, Ohio State University, 17Clinical Laboratory for Bionic Extremity Reconstruction, Department of Plastic, Reconstructive and Aesthetic Surgery, Medical University Vienna, 18Division of Plastic Surgery, Department of Surgery, Northwestern Feinberg School of Medicine, 19Medical Bionics Department, University of Melbourne, 20Prometei Pain Rehabilitation Center

The protocol outlines the surgical procedure for the treatment of postamputation pain using Targeted Muscle Reinnervation (TMR). TMR will be compared with two other surgical techniques, specifically Regenerative Peripheral Nerve Interface (RPNI) and neuroma excision, followed by immediate burying within muscle under the context of an international, randomized controlled trial.

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