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Prodigiosin-induced apoptosis in human colon cancer cells
1Departament de Biologia Cellular i Anatomia Patològica, Universitat de Barcelona, L'Hospitalet, Spain.
Abstract:
Prodigiosin is a red pigment produced by various bacteria including Serratia marcescens. Colorectal cancer is one of the most frequent malignancies and one of the most frequent causes of cancer death in the Western world. Its treatment is far from satisfactory and the challenge to oncologists is to find novel chemical entities with less toxicity and greater effectiveness than those used in current chemotherapy. Here we characterize the apoptotic action of prodigiosin in colon cancer cells. DLD-1 and SW-620 human colon adenocarcinoma cells, NRK and Swiss-3T3 nonmalignant cells were assayed by the MTT assay, fragmentation pattern of DNA, Hoechst 33342 staining and study of PARP cleavage by Western blot, in order to characterize the prodigiosin-induced apoptosis. Prodigiosin was purified and its structure was confirmed. Metastatic SW-620 cells were more sensitive to prodigiosin (IC50: 275 nM) than DLD-1. We did not observe a significant decrease in the viability of NRK cells. We confirmed that prodigiosin induces apoptosis in both cancer cell lines by the characteristic DNA laddering pattern and condensed nuclei or apoptotic bodies identified by fluorescence microscopy. These results indicate that prodigiosin induces apoptosis in colon cancer cells.
Insights
Prodigiosin, a bacterial pigment, effectively induces apoptosis in colon cancer cells. This natural compound shows promise as a less toxic alternative for colorectal cancer treatment.
Area of Science:
- Microbiology
- Oncology
- Biochemistry
Background:
- Colorectal cancer (CRC) is a leading cause of cancer death with unsatisfactory treatment options.
- Novel therapeutic agents with reduced toxicity and enhanced efficacy are urgently needed for CRC.
- Prodigiosin, a bacterial pigment, is explored for its potential anti-cancer properties.
Purpose of the Study:
- To investigate the apoptotic effects of prodigiosin on human colon cancer cells.
- To compare the sensitivity of different colon cancer cell lines to prodigiosin.
- To elucidate the mechanisms of prodigiosin-induced cell death.
Main Methods:
- Cell viability was assessed using the MTT assay.
- Apoptosis was confirmed through DNA fragmentation analysis and Hoechst 33342 staining.
- Western blot was used to study Poly (ADP-ribose) polymerase (PARP) cleavage.
Main Results:
- Prodigiosin induced apoptosis in DLD-1 and SW-620 colon cancer cells.
- Metastatic SW-620 cells exhibited higher sensitivity to prodigiosin (IC50: 275 nM) than DLD-1 cells.
- Non-malignant NRK cells showed no significant decrease in viability, indicating selectivity.
Conclusions:
- Prodigiosin effectively induces apoptosis in colon cancer cells.
- The pigment demonstrates potential as a selective anti-cancer agent for colorectal cancer.
- Further research into prodigiosin as a CRC therapeutic is warranted.