Summary

Ferrichlorid-induceret murin Trombose Modeller

Published: September 05, 2016
doi:

Summary

Vi rapporterer en raffineret procedure af ferrichlorid (FeCl3) -inducerede trombose modeller på carotis og mesenterisk arterie samt vene, kendetegnet effektivt med intravital mikroskopi til at overvåge tid til okklusiv tromber formation.

Abstract

Arterial thrombosis (blood clot) is a common complication of many systemic diseases associated with chronic inflammation, including atherosclerosis, diabetes, obesity, cancer and chronic autoimmune rheumatologic disorders. Thrombi are the cause of most heart attacks, strokes and extremity loss, making thrombosis an extremely important public health problem. Since these thrombi stem from inappropriate platelet activation and subsequent coagulation, targeting these systems therapeutically has important clinical significance for developing safer treatments. Due to the complexities of the hemostatic system, in vitro experiments cannot replicate the blood-to-vessel wall interactions; therefore, in vivo studies are critical to understand pathological mechanisms of thrombus formation. To this end, various thrombosis models have been developed in mice. Among them, ferric chloride (FeCl3) induced vascular injury is a widely used model of occlusive thrombosis that reports platelet activation and aggregation in the context of an aseptic closed vascular system. This model is based on redox-induced endothelial cell injury, which is simple and sensitive to both anticoagulant and anti-platelets drugs. The time required for the development of a thrombus that occludes blood flow gives a quantitative measure of vascular injury, platelet activation and aggregation that is relevant to thrombotic diseases. We have significantly refined this FeCl3-induced vascular thrombosis model, which makes the data highly reproducible with minimal variation. Here we describe the model and present representative data from several experimental set-ups that demonstrate the utility of this model in thrombosis research.

Introduction

Arteriel trombose (blodprop) er en almindelig komplikation ved mange systemiske sygdomme associeret med kronisk inflammation, herunder aterosklerose, diabetes, fedme, cancer og kroniske autoimmune reumatologiske sygdomme. Tromber, der forekommer i det arterielle cirkulation stammer fra uhensigtsmæssig blodpladeaktivering, aggregering og efterfølgende coagulatory mekanismer, og er impliceret i hjerteanfald, slagtilfælde og ekstremitet tab. Karvæggen er et komplekst system, der omfatter multiple celletyper og påvirkes af en lang række ydre faktorer, herunder forskydningsspænding, cirkulerende blodceller, hormoner og cytokiner, såvel som ekspression af antioxidant proteiner i karvæggen. In vitro forsøg kan ikke replikere dette komplekse miljø, og derfor in vivo-undersøgelser med dyremodeller er kritiske for at tillade bedre forståelse af mekanismer, der er involveret i trombotiske lidelser.

Mus har vist sig at have simma- mekanismer til mennesker i form af trombose, åreforkalkning, inflammation og diabetes 1,2. Endvidere kan transgene og knockout-mus være skabt til at teste funktionen af ​​specifikke genprodukter i et komplekst fysiologisk eller patologisk miljø. Sådanne undersøgelser efterligne menneskelige patologi og kan give vigtige mekanistisk information relateret til opdagelsen af ​​nye veje og behandlingsformer samt give vigtige detaljer karakterisere lægemiddelvirkninger på trombose.

Patologiske arterielle tromber forekomme på grund af endothellag skade eller dysfunktion og eksponering af blodstrømmen til subendoteliale matrix 3,4. Forskellige trombose modeller er blevet udviklet til at fremkalde denne endotel skader såsom mekanisk skade, fotoreaktiv sammensatte Rose Bengal-baserede oxidativ skade og laser skade fem. I dette spektrum, Ferrichlorid (FeCl3) -induceret vaskulær skade er en meget anvendt model for trombose. Dette reagens nårpåført på den ydre aspekt af fartøjer inducerer oxidative skader på vaskulære celler 6-8, med tab af endotel cellebeskyttelse fra cirkulerende blodplader og komponenter i koagulationskaskaden. Den FeCl3-modellen er enkel og følsom over for både antikoagulerende og anti-blodplader narkotika, og er blevet udført på carotis og femorale arterier, halsvener, og mesenteriale og cremasteric arterioler og venuler i mus, rotter, marsvin og kaniner 6-15.

En målbar parameter i denne model er den forløbne tid fra skade til at fuldføre fartøj okklusion, målt som blodgennemstrømningen ophør med en Doppler flow meter eller under direkte observation med intravital mikroskopi 6,7,9. En række gange mellem 5 til 30 min er blevet rapporteret i forskellige undersøgelser i C57BL6-mus 7-10,16, hvilket antyder, at FeCl3 koncentrationer, typer af anæstesi, kirurgiske teknikker, mus alder, genomisk baggrund, fremgangsmåde til måling Blood flow, og andre miljømæssige variabler få væsentlig indvirkning på denne model. Denne brede variation gør det vanskeligt at sammenligne undersøgelser fra forskellige forskergrupper og kan gøre påvisning af subtile forskelle vanskelig.

Med en vision om at minimere sådanne variabilitet og etablere en ensartet reproducerbar in vivo model-system, har vi forfinet FeCl3-induceret halspulsåren model, der gør data meget reproducerbare med minimal variation 6-10,16-19. I dette papir beskriver vi og dele de færdigheder og rapportere flere repræsentative eksperimentelle eksempler, der kan drage fordel af denne model.

Protocol

Alle procedurer og manipulationer af dyr er blevet godkendt af Institutional Animal Care og Brug udvalg (IACUC) af The Cleveland Clinic i overensstemmelse med USA Public Health Service Policy på human måde og anvendelse af dyr, og NIH Guide til pleje og anvendelse af forsøgsdyr. 1. Forberedelser: Fluorescerende farvestof til mærkning blodplader Forbered rhodamin 6G opløsning, 0,5 mg / ml, i saltvand og sterilisere opløsningen med 0,22 um filter. <…

Representative Results

Arteria carotis Trombose Model I mus med C57BL6 baggrund, anbefaler vi at bruge 7,5% FeCl3 at behandle skibet i 1 min som udgangspunkt. Under behandlingen på 7,5% FeCl3 er grænser skadede område og normal karvæggen let identificeres under mikroskop (se online video 1), hvilket tyder på, at endotel lag betydeligt beskadiget. Den tromber dannet umiddelbart efter FeCl3 behandling, og observeres i alle WT C57BL6 m…

Discussion

Den FeCl3-induceret model er en af de mest udbredte trombose modeller, som ikke alene kan give værdifulde oplysninger om genetiske modifikationer på trombocytfunktionen og trombose 7,8,16,19,31-33, men kan også være et værdifuldt redskab til vurdering af terapeutiske forbindelser og strategier for behandling og forebyggelse af aterotrombotiske sygdomme 11,17,34-37. Her har vi vist vores ændringer og forbedringer af denne model og viste yderligere bevis for anvendeligheden af ​​…

Divulgazioni

The authors have nothing to disclose.

Acknowledgements

This work was supported by the National Heart Lung and Blood Institute (NHLBI) of the National Institutes of Health under award numbers R01 HL121212 (PI: Sen Gupta), R01 HL129179 (PI: Sen Gupta, Co-I: Li) and R01 HL098217 (PI: Nieman). The content of this publication is solely the responsibility of the authors and does not necessarily represent the official views of the National Institutes of Health.

Materials

Surgical Scissors – Tungsten Carbide Fine Science Tools  14502-14 cut and hold skin
Micro-Adson Forceps – Serrated/Straight/12cm Fine Science Tools  11018-12 cut and hold skin
Metzenbaum Fino Scissors – Tungsten Carbide/Curved/Blunt-Blunt/14.5cm Fine Science Tools  14519-14   to dissect and separate soft tissue
Ultra Fine Hemostat – Smooth/Curved/12.5cm Fine Science Tools  13021-12 to dissect and separate soft tissue
Graefe Forceps – Serrated/Straight/10cm Fine Science Tools  11050-10 to dissect and separate soft tissue
Dumont #5 Fine Forceps – Biology Tips/Straight/Inox/11cm Fine Science Tools  11254-20  Isolate vessel from surounding tissue
Dumont #5XL Forceps – Standard Tips/Straight/Inox/15cm Fine Science Tools  11253-10 Isolate vessel from surounding tissue
Blunt Hook- 12cm/0.3mm Tip Diameter Fine Science Tools  10062-12 Isolate vessel from surounding tissue
Castroviejo Micro Needle Holders Fine Science Tools  12061-02 Needle holders
Suture Thread 4-0 Fine Science Tools  18020-40 For fix the incisors to the plate
Suture Thread 6-0 Fine Science Tools  18020-60 For all surgery and ligation
Kalt Suture Needles Fine Science Tools  12050-03
rhodamine 6G  Sigma 83697-1G To lebel platelets
FeCl3 (Anhydrous) Sigma 12321 To induce vessel injury
Papaverine hydrochloride Sigma P3510 To inhibit gut peristalsis.
Medline Surgical Instrument Sterilization Steam Autoclave Tapes Medline 111625 To fix the mouse to the plate
Fisherbrand™ Syringe Filters – Sterile 0.22µm Fisher 09-720-004 For sterlization of solutions injected to mice
Fisherbrand™ Syringe Filters – Sterile 0.45µm Fisher 09-719D To filter the FeCl3 solution
Sterile Alcohol Prep Pad Fisher 06-669-62 To sterilize the surgical site
Agarose  BioExpress E-3120-500 To make gel stage
Leica DMLFS fluorescent microscope Leica Intravital microscope
GIBRALTAR Platform and X-Y Stage System npi electronic GmbH http://www.npielectronic.de/products/micropositioners/burleigh/gibraltar.html
Streampix version 3.17.2 software NorPix https://www.norpix.com/

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Citazione di questo articolo
Li, W., Nieman, M., Sen Gupta, A. Ferric Chloride-induced Murine Thrombosis Models. J. Vis. Exp. (115), e54479, doi:10.3791/54479 (2016).

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