A novel method for the collection of nanoscopic vesicles from an organotypic culture model

Research output: Contribution to journalArticle

Authors

Colleges, School and Institutes

External organisations

  • 1 Centre for Statistics in Medicine (CSM), University of Oxford, Botnar Research Centre, Oxford, UK.
  • PORTICUS UK
  • University of Oxford

Abstract

Nanovesicles, exosomes and other membrane bound particles excreted by cells are currently gaining research attention since they have been shown to play a significant role in many biologically related processes. Vesicles are now thought to mediate cellular communication, transmission of some diseases and pathologically mediated calcification. Matrix vesicles have long been proposed to be central to the controlled mineralisation of bone. They remain relatively poorly studied, however, since they are challenging to extract from biological media. One difficulty is the presence of a mineral content in comparison to pure lipid vesicles, meaning that standard separation process such as ultracentrifugation are unable to precisely separate on the basis of size or weight. In this paper we report the separation of matrix vesicles from an organotypic bone culture system using a process of immunoprecipitation. Matrix vesicles were extracted using polymeric beads that were modified with an antibody for tissue non-specific alkaline phosphatase (TNALP), a surface marker abundant in bone-derived vesicles. The vesicles isolated were positive for adenosine triphosphate (ATP), the substrate for TNALP and were demonstrated to have a high-binding affinity to type I collagen, the principal collagen type found in bone. This protocol enables more detailed study of the process and regulation of mineralisation.

Details

Original languageEnglish
Pages (from-to)7622-7632
JournalRSC Advances
Volume8
Issue number14
Early online date16 Feb 2018
Publication statusPublished - 2018