Abstract
The purpose of this study is to evaluate the influence on disc cells after laser irradiation using three-dimensional (3-D) culture system and to clarify the optimum Ho:YAG laser irradiation condition on percutaneous laser disc decompression (PLDD) therapy. Since the Ho:YAG laser ablation is characterized by water-vapor bubble dynamics with pressure wave, thermal effect on cell metabolism might occur in the intervertebral disc. We studied the disc cell damage on the metabolic point of view to investigate the optimum irradiation parameter of the Ho:YAG laser. We have developed the 3-D cultured disc cell system using agarose gel to investigate laser - disc cell interaction. This culture system provides a highly in vivo-like environment for disc cells in which cell-extracellular matrix interactions appear to be more important than contacts among cells. Intervertebral discs were obtained from Japanese white. The isolated disc cells were seeded in 96-well culture plates at the cell densities of 1×106 cells/ml, and incubated for 12 days. A pulsed Ho:YAG laser was delivered through a 200 μm-core diameter single silica glass fiber. On the agarose gel including the 3-D cultured disc cells, we used the Ho:YAG laser irradiation energy ranging from 40 to 180 mJ/pulse at the fiber end. Cytotoxicity and matrix synthesis after the laser irradiations were evaluated in time course to determine the optimum condition of laser irradiations. It was confirmed that laser irradiation causes necrosis of the cells and additionally produces apoptosis depending on the condition. The ability of matrix synthesis was maintained even after the irradiation, which differed depending on the irradiation conditions. The optimum irradiation conditions seemed related to the preservation of intact area and the acceleration of matrix synthesis in reactive area.
| Original language | English |
|---|---|
| Pages (from-to) | 387-391 |
| Number of pages | 5 |
| Journal | Proceedings of SPIE - The International Society for Optical Engineering |
| Volume | 3601 |
| Publication status | Published - 1999 Jan 1 |
| Event | Proceedings of the 1999 Laser-Tissue Interaction X: Photochemical, Photothermal, and Photomechanical - San Jose, CA, USA Duration: 1999 Jan 24 → 1999 Jan 27 |
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Computer Science Applications
- Applied Mathematics
- Electrical and Electronic Engineering