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In vitro anti-cancer activity of a novel microbial fermentation product on human carcinomas
Chung Hin Chui1, Roberto Gambari, Fung Yi Lau
1Anti-Cancer Research Center, State Key Laboratory of Chinese Medicine and Molecular Pharmacology, Department of Applied Biology, and Chemical Technology, The Hong Kong Polytechnic University, PR China.
Abstract:
The possible anti-proliferation and cell death induction potential of a novel microbial fermentation extract named as oncogen XP-180 (or simply as XP-180) was tested on three human solid tumour carcinoma cell lines (non-small cell lung cancer A549, breast cancer MDA-MB231, liver adenocarcinoma SK-Hep1) and on the acute myelogenous leukaemia KG1a cell line. Anti-proliferative activity of XP-180 was observed on all of these cancer cell lines with comparable efficiency and in a dose-dependent manner. Morphological investigation further suggested that common features of apoptosis, including cell shrinkage and rounding, are present in XP-180 treated cells. Loss of adhesion properties of these solid tumour cell lines was observed upon XP-180 incubation. Anchorage-dependent clonogenicity assay on solid tumour cell lines and semi-solid methylcellulose colony formation assay on leukaemia cell line further revealed that XP-180 strongly inhibited the regeneration potential of these cancer cells. Using KG1a as an experimental model system, XP-180 was shown to stimulate the activity of caspase 3, 8 and 9 without significant change in caspase 6 activity. Furthermore, XP-180 readily induced collapse of mitochondrial membrane potential after 2 h of incubation. However, the use of the generic caspase specific inhibitor Z-VAD-FMK does not significantly reverse XP-180 mediated cell death. The results obtained suggest that XP-180-mediated cancer cell death could involve mitochondria and both caspase-dependent and -independent pathways. Therefore, XP-180 is an efficient anti-cancer regimen in vitro.
Insights
A novel microbial extract, oncogen XP-180, effectively inhibits cancer cell proliferation and induces cell death across multiple human cancer types. This anti-cancer potential involves apoptosis, mitochondrial disruption, and both caspase-dependent and -independent pathways.
Area of Science:
- Biochemistry
- Cell Biology
- Pharmacology
Background:
- Cancer remains a leading cause of mortality worldwide, necessitating novel therapeutic strategies.
- Microbial fermentation extracts are a promising source of new anti-cancer agents.
- Understanding the mechanisms of novel anti-cancer compounds is crucial for drug development.
Purpose of the Study:
- To evaluate the anti-proliferative and cell death-inducing potential of a novel microbial fermentation extract, oncogen XP-180 (XP-180).
- To investigate the mechanisms underlying XP-180-mediated cancer cell death.
- To assess XP-180's efficacy across various human cancer cell lines.
Main Methods:
- Testing XP-180 on human solid tumor cell lines (A549, MDA-MB231, SK-Hep1) and a leukemia cell line (KG1a).
- Morphological analysis and apoptosis assays.
- Clonogenicity and colony formation assays.
- Caspase activity assays (caspase 3, 6, 8, 9) and mitochondrial membrane potential assessment.
- Inhibition studies using a caspase inhibitor (Z-VAD-FMK).
Main Results:
- XP-180 demonstrated dose-dependent anti-proliferative activity against all tested cancer cell lines.
- Morphological changes indicative of apoptosis (cell shrinkage, rounding) and loss of adhesion were observed.
- XP-180 significantly inhibited cancer cell regeneration and colony formation.
- XP-180 induced caspase 3, 8, and 9 activation and mitochondrial membrane potential collapse.
- XP-180-mediated cell death was only partially reversed by a caspase inhibitor, suggesting mixed pathways.
Conclusions:
- XP-180 exhibits potent in vitro anti-cancer activity by inhibiting proliferation and inducing cell death.
- The anti-cancer effects of XP-180 involve apoptosis, mitochondrial dysfunction, and both caspase-dependent and -independent mechanisms.
- XP-180 represents a promising candidate for further investigation as an anti-cancer therapeutic agent.
