Abstract
The aim of this study was to evaluate 5-Aminolevulinic acid (ALA)-induced fluorescence of normal and neoplastic endometrial epithelial cells for diagnosis and photodynamic treatment. Fluorescence of ALA-induced PpIX in vitro was measured by flow cytometry in two different human endometrial adenocarcinoma cell lines and in normal cells cultivated from fresh endometrial tissue of three premenopausal patients. The cells were analysed after incubation with different concentrations of ALA during 3, 6, or 24 hours. Both tumor cell lines showed a statistically significant higher fluorescence of PpIX than normal epithelial cells after incubation with 1 mg ALA per ml medium during 24 hours. The well-differentiated cancer cells produced significantly more PpIX than the poorly differentiated cancer cells. Relative PpIX intensity of the two cancer cell lines correlated with cell proliferation rate as measured by the doubling times of the cells. Higher accumulation of Pp IX in neoplastic endometrium compared to normal endometrial epithelial cells may provide targeted biopsies and selective photodynamic destruction of neoplastic micro-lesions.
Highlights
The aim of this study was to evaluate 5-Aminolevulinic acid (ALA)-induced fluorescence of normal and neoplastic endometrial epithelial cells for diagnosis and photodynamic treatment
Fluorescence of ALA-induced PpIX in well (HEC)- and poorly (KLE)-differentiated endometrial cancer cells as well as in normal endometrial cells evaluated by flow cytometry after an incubation time of 3, 6 or 24 hours with different concentrations of ALA is stated in figure 1
Highest intracellular Protoporphyrin IX (Pp IX) accumulation was measured at ALA-concentrations of 1 mg/ml medium in highest in the well-differentiated cells (HEC)-cells and of 0.1 and 1 mg/ml medium in KLE-cells
Summary
The aim of this study was to evaluate 5-Aminolevulinic acid (ALA)-induced fluorescence of normal and neoplastic endometrial epithelial cells for diagnosis and photodynamic treatment. Fluorescence of ALA-induced PpIX in vitro was measured by flow cytometry in two different human endometrial adenocarcinoma cell lines and in normal cells cultivated from fresh endometrial tissue of three premenopausal patients. Higher accumulation of Pp IX in neoplastic endometrium compared to normal endometrial epithelial cells may provide targeted biopsies and selective photodynamic destruction of neoplastic micro-lesions. Because of the growing interest in photodynamic technique as a potential tool for diagnosis and treatment of endometrial neoplastic lesions, this study was designed to evaluate the potential of normal and neoplastic human endometrial cells to accumulate ALA-induced PpIX. A higher content of Pp IX in neoplastic endometrium may provide targeted biopsies and selective destruction of small lesions
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