Repair and Reconstruction of Peripheral Nerve Injuries. Treatment with G-CSF and Stromal Vascular Fraction.

Hanna Frost

Research output: ThesisDoctoral Thesis (compilation)

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While surgery is a cornerstone in treatment of peripheral nerve injuries, it is not a comprehensive approach, and outcome is unsatisfactory, especially sensory function. The present aim was to translate recent findings about stem- and progenitor cells to improve regenerative outcome, where the cells have to be autologous, available within the same surgical procedure, and minimally manipulated.

Granulocyte colony-stimulating factor (G-CSF) mobilizes hematopoietic stem cells from the bone marrow. Post-traumatic G-CSF therapy, evaluated in a rat sciatic nerve injurymodel with immediate repair, showed a 13% local decrease in Schwann cell apoptosis at the site of lesion, and a similar trend in the distal nerve segment in healthy rats, and at the site of lesion in diabetic Goto-Kakizaki rats. G-CSF had no effect on axonal outgrowth in short- or long term experiments.

Stromal vascular fraction (SVF) of adipose tissue is a heterogenic mixture of cells, including small amounts of adipose derived stem cells. Electrospun multi-channeled nerve conduits, designed to mimic a native nerve, with longitudinal nanofibers inside the channels for axonal guidance +/- delivered SVF to the nerve conduit was used to bridge a 10 mm sciatic nerve gap in healthy rats. The nerve conduit supported axonal outgrowth and acted as a cell delivery vehicle during the observation time (four weeks). SVF did not improve axonal outgrowth, and adverse effects – gross encapsulation – was observed in 9/30 implants after SVF therapy. Schwann cell infiltration was inferior in nerve conduits supplemented with SVF cells, with a partially enhanced inflammatory response.

Co-culture of SVF cells and peripheral nerve segments performed on aligned nanofibers, recreating in vitro the environment above, showed no change in expression of Schwann cell marker S-100 in SVF cells, but increased Sox10 in SVF cells exposed to a nerve segment compared to baseline. Pilot experiments with mass spectrometry indicated a SVF-nerve interplay in the local microenvironment.

In conclusion, G-CSF and SVF therapy affected glial cells, but did not improve axonal outgrowth. G-CSF decreases Schwann cell apoptosis, but does not improve regenerative outcome. An electrospun nerve conduit can be used to bridge a nerve gap and act as a cell delivery vehicle. SVF delivered in micro-channels interferes with ingrowth of Schwann cells by unknown mechanisms.
Translated title of the contributionReparation och rekonstruktion av perifera nervskador : Behandling med G-CSF och stromal vascular fraction
Original languageEnglish
  • Dahlin, Lars, Supervisor
  • Ekström, Per, Assistant supervisor
  • Johansson, Per Fredrik, Assistant supervisor
Award date2019 Nov 8
Place of PublicationLund
ISBN (Print)978-91-7619-826-1
Publication statusPublished - 2019

Bibliographical note

Defence details
Date: 2019-11-08
Time: 09:00
Place: Lilla aulan, Jan Waldenströms gata 5, Skånes Universitetssjukhus i Malmö
External reviewer(s)
Name: Radtke, Christine
Title: Universität-Professor
Affiliation: Medical University of Vienna, Vienna, Austria

Subject classification (UKÄ)

  • Neurosciences


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