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Updated: Jun 17, 2026
High Content Screening Analysis to Evaluate the Toxicological Effects of Harmful and Potentially Harmful Constituents (HPHC)
Published on: May 10, 2016
The cell toxicity effect of secalonic acid D on GH3 cells and the related mechanisms
Guizhi Liao1, Jing Zhou, Hui Wang
1Department of Histology and Embryology, Sun Yat-sen University, Guangzhou, Guangdong, PR China.
Abstract:
To investigate the anti-pituitary adenoma effect of secalonic acid D (SAD) extracting from marine microorganisms, we used MTT colorimetric method to evaluate the proliferation of GH3 cells treated by SAD, the time- and dose-dependent effects and the value of IC50 were recorded. Hoechst staining, Tunel and flow cytometry methods were used to analyze the apoptosis rate of GH3 cells treated by SAD. Western blotting, RT-PCR and caspase inhibitor (Z-VAD-FMK) were used to investigate the possible mechanism of SAD induced apoptosis and the expression of growth hormone (GH). The results showed that SAD has a time- and dose-dependent effect on GH3 cells and the cytotoxic effect was mainly through apoptosis. The mechanisms were partly through the activity of caspase family and also G1/S phase block. In addition, SAD also can suppress the expression levels of growth hormone in GH3 cells, however, the RT-PCR results showed that the mechanism was not through changing the expression of GH mRNA. We concluded that SAD may be a potential anti-pituitary tumor drug and further in vivo studies should be performed.
Insights
Secalonic acid D (SAD) from marine microbes effectively inhibits pituitary adenoma GH3 cells by inducing apoptosis and suppressing growth hormone. Further in vivo studies are recommended for this potential anti-pituitary tumor drug.
Area of Science:
- Marine Microbiology
- Pharmacology
- Cell Biology
Background:
- Pituitary adenomas are common tumors.
- Marine microorganisms are a source of novel bioactive compounds.
- Secalonic acid D (SAD) is a compound with potential therapeutic applications.
Purpose of the Study:
- To investigate the anti-pituitary adenoma effects of secalonic acid D (SAD).
- To evaluate the cytotoxic effects of SAD on GH3 cells.
- To elucidate the mechanism of SAD-induced apoptosis and its effect on growth hormone (GH) expression.
Main Methods:
- MTT assay for cell proliferation and IC50 determination.
- Hoechst staining, Tunel assay, and flow cytometry for apoptosis analysis.
- Western blotting, RT-PCR, and caspase inhibitor (Z-VAD-FMK) for mechanistic studies.
Main Results:
- SAD exhibited time- and dose-dependent cytotoxicity against GH3 cells.
- Cytotoxicity was primarily mediated through apoptosis, involving caspase family activation and G1/S phase cell cycle arrest.
- SAD suppressed GH expression in GH3 cells, but not by altering GH mRNA levels.
Conclusions:
- Secalonic acid D demonstrates potential as an anti-pituitary tumor agent.
- Apoptosis induction and GH suppression are key mechanisms of SAD's action.
- Further in vivo studies are warranted to validate the therapeutic potential of SAD.
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