Abstract
Neuroblastoma is characterized by biological and genetic heterogeneity that leads to diverse, often unpredictable, clinical behavior. Differential expression of the Trk family of neurotrophin receptors strongly correlates with clinical behavior; TrkA expression is associated with favorable outcome, whereas TrkB with unfavorable outcome. Neuroblastoma cells cultured in a microgravity rotary bioreactor spontaneously aggregate into tumor-like structures, called organoids. We wanted to determine if the clinical heterogeneity of TrkA- or TrkB-expressing neuroblastomas was reflected in aggregation kinetics and organoid morphology. Trk-null SY5Y cells were stably transfected to express either TrkA or TrkB. Short-term aggregation kinetics were determined by counting the number of single (non-aggregated) viable cells in the supernatant over time. Organoids were harvested after 8 d of bioreactor culture, stained, and analyzed morphometrically. SY5Y-TrkA cells aggregated significantly slower than SY5Y and SY5Y-TrkB cells, as quantified by several measures of aggregation. SY5Y and TrkB cell lines formed irregularly shaped organoids, featuring stellate projections. In contrast, TrkA cells formed smooth (non-stellate) organoids. SY5Y organoids were slightly smaller on average, but had significantly larger average perimeter than TrkA or TrkB organoids. TrkA expression alone is sufficient to dramatically alter the behavior of neuroblastoma cells in three-dimensional, in vitro rotary bioreactor culture. This pattern is consistent with both clinical behavior and in vivo tumorigenicity, in that SY5Y-TrkA represents a more differentiated, less aggressive phenotype. The microgravity bioreactor is a useful in vitro tool to rapidly investigate the biological characteristics of neuroblastoma and potentially to assess the effect of cytotoxic as well as biologically targeted drugs.
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Redden, R.A., Iyer, R., Brodeur, G.M. et al. Rotary bioreactor culture can discern specific behavior phenotypes in Trk-null and Trk-expressing neuroblastoma cell lines. In Vitro Cell.Dev.Biol.-Animal 50, 188–193 (2014). https://doi.org/10.1007/s11626-013-9716-z
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DOI: https://doi.org/10.1007/s11626-013-9716-z