Related Experiment Videos
Calcium channel antagonist effect on in vitro meningioma signal transduction pathways after growth factor stimulation
R L Jensen1, M Petr, R D Wurster
1Department of Neurosurgery, University of Utah, Salt Lake City 84112, USA.
Objective:
We have previously demonstrated that calcium channel antagonists inhibit the growth of human meningiomas in culture after stimulation with growth factors. This study examined the effects of these drugs on signaling transduction pathways in an attempt to elucidate potential mechanisms by which this growth inhibition is mediated.
Methods:
Primary cell cultures from patients with intracranial meningiomas were established. Cell growth studies were performed with inhibitors and stimulators of tyrosine kinase signal transduction. Intracellular calcium changes and inositol phosphate production were measured after growth factor exposure, with or without pretreatment by calcium channel antagonists.
Results:
The growth of meningiomas in culture can be inhibited by tyrosine kinase receptor inhibitors. Inhibitors and stimulators of phospholipase C can stimulate or inhibit the growth of in vitro meningiomas, respectively. Calcium channel antagonists inhibit intracellular calcium changes induced by serum and epidermal growth factor. Inositol phosphate production is increased after growth factor stimulation, and calcium channel antagonists potentiate this effect.
Conclusion:
Calcium channel antagonists interfere with intracellular signaling pathways of cultured meningioma cells. This inhibition is unrelated to voltage-sensitive calcium channels. The findings of this project may aid in the understanding of the signal transduction mechanisms involved in growth factor-mediated meningioma proliferation and may lead to clinically relevant strategies for growth inhibition.
Insights
Calcium channel antagonists inhibit human meningioma cell growth by interfering with intracellular signaling pathways. These drugs affect calcium and inositol phosphate levels, offering potential strategies for meningioma growth inhibition.
Area of Science:
- Neuro-oncology
- Cellular signaling
- Pharmacology
Background:
- Human meningiomas are tumors that can be influenced by growth factors.
- Calcium channel antagonists have shown potential in inhibiting meningioma cell growth in culture.
Purpose of the Study:
- To investigate the effects of calcium channel antagonists on signaling transduction pathways in human meningioma cells.
- To elucidate the mechanisms underlying growth inhibition mediated by these drugs.
Main Methods:
- Established primary cell cultures from intracranial meningiomas.
- Performed cell growth studies using tyrosine kinase signal transduction modulators.
- Measured intracellular calcium changes and inositol phosphate production after growth factor stimulation, with or without calcium channel antagonists.
Main Results:
- Tyrosine kinase receptor inhibitors reduced meningioma cell growth.
- Calcium channel antagonists inhibited intracellular calcium changes induced by serum and epidermal growth factor.
- Calcium channel antagonists potentiated the increase in inositol phosphate production observed after growth factor stimulation.
Conclusions:
- Calcium channel antagonists interfere with intracellular signaling pathways in cultured meningioma cells.
- The observed inhibition is independent of voltage-sensitive calcium channels.
- Findings contribute to understanding growth factor-mediated meningioma proliferation and may inform clinical strategies.