Dissociated neurons and glial cells derived from rat inferior colliculi after digestion with papain

PLoS One. 2013 Dec 12;8(12):e80490. doi: 10.1371/journal.pone.0080490. eCollection 2013.

Abstract

The formation of gliosis around implant electrodes for deep brain stimulation impairs electrode-tissue interaction. Unspecific growth of glial tissue around the electrodes can be hindered by altering physicochemical material properties. However, in vitro screening of neural tissue-material interaction requires an adequate cell culture system. No adequate model for cells dissociated from the inferior colliculus (IC) has been described and was thus the aim of this study. Therefore, IC were isolated from neonatal rats (P3_5) and a dissociated cell culture was established. In screening experiments using four dissociation methods (Neural Tissue Dissociation Kit [NTDK] T, NTDK P; NTDK PN, and a validated protocol for the dissociation of spiral ganglion neurons [SGN]), the optimal media, and seeding densities were identified. Thereafter, a dissociation protocol containing only the proteolytic enzymes of interest (trypsin or papain) was tested. For analysis, cells were fixed and immunolabeled using glial- and neuron-specific antibodies. Adhesion and survival of dissociated neurons and glial cells isolated from the IC were demonstrated in all experimental settings. Hence, preservation of type-specific cytoarchitecture with sufficient neuronal networks only occurred in cultures dissociated with NTDK P, NTDK PN, and fresh prepared papain solution. However, cultures obtained after dissociation with papain, seeded at a density of 2×10(4) cells/well and cultivated with Neuro Medium for 6 days reliably revealed the highest neuronal yield with excellent cytoarchitecture of neurons and glial cells. The herein described dissociated culture can be utilized as in vitro model to screen interactions between cells of the IC and surface modifications of the electrode.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Microscopy, Atomic Force
  • Neuroglia / cytology*
  • Neurons / cytology*
  • Oligodendroglia / cytology
  • Papain / metabolism*
  • Rats
  • Rats, Sprague-Dawley

Substances

  • Papain

Grants and funding

This project was supported by the German Research Foundation (DFG; SFB 599, subproject D2; www.dfg.de; http://www.sfb599.de/). Andrej Kral, Pooyan Aliuos, and Athanasia Warnecke are supported by the cluster of excellence of the DFG (“Deutsche Forschungsgemeinschaft”) “Hearing4all”. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.