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Cloning of sequences induced and suppressed by administration of PSK, antitumor protein-bound polysaccharide
Abstract:
To elucidate the effects of PSK, a protein-bound polysaccharide from Coriolus versicolor, on gene expression in tumor cells, we prepared cDNA clone libraries from PSK-treated and untreated cells of a rat ascites hepatoma line, AH66, which was previously shown to be susceptible to the antitumor action of this compound. Two PSK-induced and one suppressed cDNA clones were selected from these libraries by using a differential colony hybridization and RNA blot hybridization. PSK was thus shown to have a direct effect on the transcription and consequently on the translation of tumor cells.
Insights
Protein-bound polysaccharide K (PSK) directly impacts gene expression in rat hepatoma cells. This study reveals PSK influences tumor cell transcription and translation, contributing to its antitumor effects.
Area of Science:
- Biochemistry and Molecular Biology
- Cancer Research
- Pharmacology
Background:
- Coriolus versicolor yields protein-bound polysaccharide K (PSK), a compound with demonstrated antitumor activity.
- Rat ascites hepatoma line AH66 is known to be susceptible to PSK's antitumor effects.
- Understanding PSK's molecular mechanisms is crucial for cancer therapy development.
Purpose of the Study:
- To investigate the direct effects of PSK on gene expression in tumor cells.
- To identify specific genes regulated by PSK treatment in AH66 hepatoma cells.
- To elucidate the impact of PSK on tumor cell transcription and translation.
Main Methods:
- Preparation of cDNA clone libraries from PSK-treated and untreated AH66 rat hepatoma cells.
- Differential colony hybridization to screen for unique cDNA clones.
- RNA blot hybridization to validate PSK-induced and suppressed gene expression.
Main Results:
- Identification of two cDNA clones showing increased expression after PSK treatment.
- Identification of one cDNA clone showing suppressed expression after PSK treatment.
- Confirmation of PSK's direct influence on gene transcription in tumor cells.
Conclusions:
- PSK exerts a direct effect on the transcriptional activity of tumor cells.
- The observed changes in gene expression correlate with PSK's antitumor properties.
- PSK modulates both upregulated and downregulated gene pathways in susceptible hepatoma cells.