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Modified fibrin hydrogel for sustained delivery of RNAi lipopolyplexes in skeletal muscle

Regenerative Biomaterials 2023年第1期10卷 261-270页

作者： Ellen Ngarande Emma Doubell Ousman Tamgue Manuel Mano Paul Human Mauro Giacca neil Hamer Davies Cardiovascular Research Unit Department of SurgeryFaculty of Health SciencesUniversity of Cape TownObservatory 7925South Africa International Centre for Genetic Engineering and Biotechnology(ICGEB) Cape Town ComponentObservatory 7925South Africa Institute of Infectious Diseases and Molecular Medicine(IDM) Department of PathologyDivision of Immunology and South African Medical Research Council(SAMRC)Immunology of Infectious DiseasesFaculty of Health SciencesUniversity of Cape TownObservatory 7925South Africa King’s College London British Heart Foundation Centre of Research ExcellenceSchool of Cardiovascular Medicine&SciencesWC2R 2LSLondonUK Present address:Department of Biochemistry Faculty of SciencesUniversity of DoualaDoualaCameroon

RNA interference is a promising therapeutical approach presently hindered by delivery concerns such as rapid RNA degradation and targeting of individual *** hydrogels are one potentially simple and direct route towards overcoming these *** we report on the utility of a combination of a mildly modified form of the clinically utilised fibrin hydrogel with Invivofectamine^(■)3.0,a lipid nonviral transfection vector,for local and sustained *** of fibrin allowed for controlled release of small interfering RNA(siRNA)-lipopolyplexes for at least 10 days and greatly increased the stability of fibrin in vitro and in vivo.A 3D cell culture model and a release study showed transfection efficacy of siRNA-lipopolyplexes was retained for a minimum of 7 *** in conjunction with PEGylated-fibrinogen significantly increased retention of siRNA-lipopolyplexes in mouse skeletal muscle and enhanced knockdown of myostatin mRNA that correlated with muscle ***,the increased efficacy observed here for the combination of a lipid nanoparticle,the only type of nonviral vector approved for the clinic,with fibrin,might allow for more rapid translation of injectable hydrogel-based RNA interference.

关键词： RNA interference controlled release fibrin lipopolyplex

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Acid-insoluble ash is a better indigestible marker than chromic oxide to measure apparent total tract digestibility in pigs

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Animal Nutrition 2021年第1期7卷 64-71页

作者： Susanto Prawirodigdo neil J.Gannon Brian J.Leury Frank R.Dunshea Faculty of Veterinary and Agricultural Sciences The University of MelbourneParkvilleVictoria3010Australia Balai Pengkajian Teknologi Pertanian Central Java SemarangCentral Java50552Indonesia Biomin Singapore PO Box 2419ToowoombaQLD4350Australia Faculty of Biological Sciences The University of LeedsLeedsLS29JTUnited Kingdom

The aim of this study was to determine the apparent total tract digestibility(ATTD)of nutrients in cottonseed meal(CSM)and soybean meal(SBM)in simple carbohydrate and more complex wheat-based diets using 2 indigestible markers and total faecal ***-five Large White×Landrace boars(57.8 kg)were randomly allocated to either a pure wheat diet,40%CSM or SBM in either a sugar-starch-(1∶1)or wheat-based diet for 18 ***-insoluble ash(AIA)and chromic oxide(Cr2O3)were included in all diets as indigestible *** were offered(1,800 g/d per pig)in 3 meals/d from d 1 to 11 and 8 meals/d from d 12 to *** d 9,the pigs were moved to individual metabolism cages to allow total faecal *** d 18,the pigs were fed hourly for 8 *** the 8th meal,pigs were anaesthetized and digesta sampled from the terminal ileum and rectum before lethal *** were no differences between ATTD of nitrogen(N)determined using AIA as a marker and measured by total faecal *** the other hand,the ATrD of N of diets containing CSM in sugar-starch-or wheat-based diets and the pure wheat diet determined using Cr2O3 as a marker was less(-3.11%,-4.46%and-6.59%;Plso,the slope of the regression line and the intercept were closer to unity and zero for the relationship when the ATTD of N was determined using AIA compared to Cr2O3 as an indigestible *** ATTD of organic and dry matter behaved *** data demonstrate that the basal diet and choice of indigestible marker can substantially influence the ATTD and that the use of AIA as an indigestible marker is more suita

关键词： Organic matter Pig Wheat Cottonseed meal Soybean meal Digestibility Nitrogen

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