In vitro enhancement and functional characterization of neurite outgrowth by undifferentiated adipose-derived stem cells

Bucan,Vesna; Fliess,Malte; Schnabel,Reinhild; Peck,Claas‑Tido; Vaslaitis,Desiree; Fülbier,Angela; Reimers,Kerstin; Strauss,Sarah; Vogt,Peter   M.; Radtke,Christine

doi:10.3892/ijmm.2018.3979

In vitro enhancement and functional characterization of neurite outgrowth by undifferentiated adipose-derived stem cells

Authors:
- Vesna Bucan
- Malte Fliess
- Reinhild Schnabel
- Claas‑Tido Peck
- Desiree Vaslaitis
- Angela Fülbier
- Kerstin Reimers
- Sarah Strauss
- Peter M. Vogt
- Christine Radtke
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Affiliations: Department of Plastic, Aesthetic, Hand and Reconstructive Surgery, Hannover Medical School, D‑30625 Hannover, Germany
Published online on: November 6, 2018 https://doi.org/10.3892/ijmm.2018.3979
Pages: 593-602

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Abstract

Adipose‑derived stem cells (ASCs) can easily be obtained and expanded in vitro for use in autologous cell therapy. Via their production of cytokines and neurotrophic factors, transplanted ASCs provide neuroprotection, neovascularization and induction of axonal sprouting. However, the influencing mechanism of undifferentiated ASCs on nerve regeneration is currently only partially understood. In the present study, undifferentiated ASCs and cutaneous primary afferent dorsal root ganglion (DRG) neurons were co‑cultured in order to investigate their interaction. ASCs were isolated from adult rat fat tissue. The presence of characteristic stem cell markers was determined by flow cytometry in three subsequent passages. Adipogenic, osteogenic, chondrogenic and glial differentiation was performed in order to evaluate their differentiation capacity. A direct co‑culture system with DRG cells was established to determine the effect of undifferentiated pluripotent ASCs on neurite elongation. Neurite outgrowth, length and number was examined in the co‑culture and compared with single‑culture cells and cells stimulated with nerve growth factor (NGF). In ASC cultures, NGF expression was assessed by ELISA. The present results demonstrated that the specific mesenchymal stem cell surface markers CD44, CD73 and CD90 were detected in all three subsequent passages of the isolated ASCs. In accordance, ASC differentiation into adipogenic, osteogenic, chondrogenic and Schwann cell phenotype was conducted successfully. Neurite outgrowth of DRG neurons was enhanced following co‑culture with ASCs, resulting in increased neurite length after 24 h of cultivation. Furthermore, neurite outgrowth of DRG neurons was directed towards the undifferentiated ASC and direct cell‑to‑cell contact was observed. In summary, the results of the present study revealed an interaction between the two cell types with guidance of neurite growth towards the undifferentiated ASC. These findings suggest that the use of undifferentiated ASC optimizing tissue‑engineered constructs may be promising for peripheral nerve repair.

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