Dong niversity

Busan, South Korea

Dong niversity

Busan, South Korea

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Kim T.-E.,Ajou University | Kim C.G.,Ajou University | Kim J.S.,Korea Polytechnic University | Jin S.,Korea Polytechnic University | And 5 more authors.
International Journal of Nanomedicine | Year: 2016

An artificial three-dimensional (3D) culture system that mimics the tumor microenvironment in vitro is an essential tool for investigating the cross-talk between immune and cancer cells in tumors. In this study, we developed a 3D culture system using an electrospun poly(ε-caprolactone) (PCL) nanofibrous scaffold (NFS). A hybrid NFS containing an uninter­rupted network of nano- and submicron-scale fibers (400 nm to 2 μm) was generated by deposition onto a stainless steel mesh instead of an aluminum plate. The hybrid NFS contained multiplanar pores in a 3D structure. Surface-seeded mouse CT26 colon cancer cells and bone marrow-derived dendritic cells (BM-DCs) were able to infiltrate the hybrid NFS within several hours. BM-DCs cultured on PCL nanofibers showed a baseline inactive form, and lipopolysaccharide (LPS)-activated BM-DCs showed increased expression of CD86 and major histocompatibility complex Class II. Actin and phosphorylated FAK were enriched where unstimulated and LPS-stimulated BM-DCs contacted the fibers in the 3D hybrid NFS. When BM-DCs were cocultured with mitoxantrone-treated CT26 cells in a 3D hybrid NFS, BM-DCs sprouted cytoplasm to, migrated to, synapsed with, and engulfed mitoxantrone-treated CT26 cancer cells, which were similar to the naturally occurring cross-talk between these two types of cells. The 3D hybrid NFS developed here provides a 3D structure for coculture of cancer and immune cells. © 2016 Avaji et al.


Kim H.J.,Dong niversity | Lee K.Y.,Dong niversity | Wang L.,Dong niversity
Orthopedic Research and Reviews | Year: 2014

Background: The purpose of this study was to analyze the complications, clinical outcomes, and any correlative risk factors associated with degenerative lumbar deformity surgery in elderly patients. Methods: We reviewed 78 patients who underwent posterior decompression and posterolateral fusion requiring a minimum three-level fusion for degenerative lumbar deformity associated with spinal stenosis between May 2001 and May 2006, with at least a one-year follow-up period. We assessed and compared the postoperative complications and clinical outcomes for patients aged 65 years and over (group A) and patients aged 50-64 years (group B). Risk factors that could influence complications and clinical outcome were evaluated and statistically analyzed. Results: The postoperative complication rate was not significantly different between the two age groups (53% in group A and 40% in group B); however, group A had a significantly higher frequency of minor complications than group B, especially for urinary retention and postopera­tive delirium. A statistical relationship between diabetes mellitus and deep wound infection, one of the major complications of degenerative lumbar deformity surgery, was observed in both group A and group B. Male sex was a risk factor for urinary retention and long operative time, and abundant blood loss was a significant risk factor for postoperative delirium in group A. Conclusion: There were no significant differences in results for degenerative lumbar deformity surgery between patients older and younger than 65 years. However, diabetes mellitus showed a significant correlation with deep wound infection, which is one of the major complications of degenerative lumbar deformity surgery, and with urinary retention and postoperative delirium, which occurred frequently in patients aged older than 65 years. © 2014 Kim et al.

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