Influence of biogenic amines on the growth of xenografted human colorectal carcinomas
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Abstract:
The influence of some biogenic amines and amine-receptor-blocking drugs in the growth rate of human colorectal carcinomas propagated as s.c. xenografts in immune-deprived mice was studied. In mice treated with adrenaline, a beta-adrenergic agonist, the growth of xenografts was suppressed for 2 days, after which growth was resumed at a rate similar to that in control animals. Treatment with the phosphodiesterase inhibitor theophylline prolonged the adrenaline-induced inhibition of growth. Treatment with the beta-adrenergic antagonist sotalol or practolol increased the rate of tumour growth. Treatment with either serotonin or the histamine H2-receptor agonist Dimiprit had no effect on tumour growth rate. However, the antiserotoninergic drug BW 501C and the histamine H2-receptor antagonist cimetidine each caused short-term suppression of tumour growth.
Insights
Biogenic amines and drugs affect colorectal cancer growth. Adrenaline initially suppressed tumor growth, while antagonists like sotalol accelerated it, indicating complex interactions.
Area of Science:
- Oncology
- Pharmacology
- Molecular Biology
Background:
- Biogenic amines play roles in cellular processes.
- Amine receptors are potential targets for cancer therapy.
- Understanding these interactions is crucial for developing new treatments.
Purpose of the Study:
- To investigate the impact of biogenic amines and receptor-blocking drugs on human colorectal carcinoma xenograft growth.
- To determine the effects of specific agonists and antagonists on tumor proliferation rates.
Main Methods:
- Human colorectal carcinomas were propagated as subcutaneous xenografts in immune-deprived mice.
- Mice were treated with adrenaline (beta-adrenergic agonist), theophylline, sotalol/practolol (beta-adrenergic antagonists), serotonin, Dimiprit (histamine H2-receptor agonist), BW 501C (antiserotoninergic), and cimetidine (histamine H2-receptor antagonist).
- Tumor growth rates were monitored and compared to control groups.
Main Results:
- Adrenaline transiently suppressed xenograft growth for 2 days, with subsequent resumption of growth.
- Theophylline prolonged adrenaline-induced growth inhibition.
- Beta-adrenergic antagonists (sotalol, practolol) accelerated tumor growth rates.
- Serotonin and Dimiprit had no significant effect on tumor growth.
- BW 501C and cimetidine induced short-term tumor growth suppression.
Conclusions:
- Adrenergic signaling influences colorectal carcinoma xenograft growth, with agonists showing inhibitory and antagonists promoting effects.
- Histamine H2 receptor modulation and serotonin pathways appear less critical for xenograft growth under these conditions.
- Pharmacological targeting of specific amine receptors may offer novel therapeutic strategies for colorectal cancer.