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Histopathologic and ultrastructural correlates of tumor growth suppression by high energy shock waves
Abstract:
High energy shock waves (HESW) are cytotoxic to tumor cells as determined by vital staining and impaired ability of viable cells to form colonies in a clonogenic assay. In addition, direct exposure of tumor nodules to HESW results in suppression of tumor growth rate. In order to identify histopathologic and ultrastructural correlates of these observations, R3327AT-3 prostatic tumor cells were exposed to HESW in vitro and in vivo. Damage to cells in suspension was manifested by fragmentation of cells to form debris. At the ultrastructural level, mitochondria were swollen and contained distorted cristae following exposure of tumor cells to HESW. In vivo exposure of tumor nodules to HESW did not cause a distinct histopathologic or ultrastructural effect that could be qualitatively distinguished from spontaneously occurring cell death. Hemorrhage and necrosis were observed in muscle and fibroadipose tissue adjacent to tumor. The mechanism of HESW-induced cytotoxicity is not clear from our studies. Evidence of damage of normal tissues exposed in vivo and tumor cells in vitro is reflected in histomorphological changes.
Insights
High energy shock waves (HESW) show cytotoxic effects on tumor cells, inhibiting their growth and colony formation. Histomorphological changes indicate damage to both tumor cells and surrounding normal tissues.
Area of Science:
- Oncology
- Biophysics
Background:
- High energy shock waves (HESW) exhibit potential anti-tumor properties.
- Cytotoxicity of HESW to tumor cells is suggested by impaired colony formation and growth suppression.
Purpose of the Study:
- To investigate the histopathologic and ultrastructural effects of HESW on R3327AT-3 prostatic tumor cells.
- To correlate observed cellular damage with the cytotoxic effects of HESW.
Main Methods:
- Exposure of R3327AT-3 prostatic tumor cells to HESW in vitro (cell suspension) and in vivo (tumor nodules).
- Vital staining and clonogenic assays to assess cell viability.
- Histopathological and ultrastructural examination of treated cells and tissues.
Main Results:
- In vitro HESW exposure caused cell fragmentation and mitochondrial damage (swollen mitochondria, distorted cristae).
- In vivo HESW exposure led to hemorrhage and necrosis in adjacent normal tissues but no distinct histopathological changes in tumor nodules compared to spontaneous cell death.
- Histomorphological changes indicated damage to both tumor cells and normal tissues.
Conclusions:
- HESW demonstrates cytotoxic effects on tumor cells, evidenced by cell fragmentation and mitochondrial alterations in vitro.
- While HESW suppresses tumor growth and damages adjacent normal tissues in vivo, the precise mechanism of cytotoxicity remains unclear.
- Observed histomorphological changes support HESW-induced damage to tumor and normal tissues.