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Extracellular matrix changes PC12 cell shape and processing of newly synthesized dopamine
C L Bethea1, O K Rønnekleiv, S L Kozak
1Division of Reproductive Biology and Behavior, Oregon Regional Primate Research Center, Beaverton 97006.
Molecular and Cellular Endocrinology
|November 1, 1987
Summary
PC12 cells on extracellular matrix (ECM) release more dopamine, while cells on plastic store more. Cell shape changes on ECM may enhance dopamine secretion via increased surface area to volume ratio.
Area of Science:
- Cell Biology
- Neuroscience
- Biochemistry
Background:
- PC12 cells are a widely used model for studying neuronal function, particularly dopamine synthesis and secretion.
- Extracellular matrix (ECM) and culture substrate (plastic) can influence cell morphology and function.
- Dopamine (DA) is a crucial neurotransmitter involved in various physiological processes.
Purpose of the Study:
- To investigate the impact of extracellular matrix (ECM) versus plastic substrates on dopamine release and storage in PC12 cells.
- To characterize the relationship between cell morphology and dopamine secretion dynamics.
- To assess the influence of serum and tyrosine availability on dopamine metabolism in PC12 cells.
Main Methods:
- PC12 cells were cultured on ECM or plastic and incubated with radiolabeled tyrosine (3H-TY).
- Quantification of radiolabeled dopamine (3H-DA) in both cells and medium using Dowex cation exchange chromatography.
- Morphometric analysis of cell shape and surface area to volume ratio (P/A) using quantitative digital analysis.
- Immunocytochemistry for tyrosine hydroxylase distribution.
Main Results:
- PC12 cells on ECM showed significantly higher 3H-DA release into the medium, whereas cells on plastic had higher intracellular 3H-DA content.
- Total 3H-DA (cellular + medium) was comparable between ECM and plastic cultures, indicating similar synthesis rates.
- Cells cultured on ECM exhibited a greater perimeter length to area ratio (P/A), suggesting increased cell surface area relative to volume, potentially facilitating exocytosis.
- Serum affected 3H-DA retention and uptake, while tyrosine availability modulated detected 3H-DA levels.
Conclusions:
- Increased cell surface area to volume ratio in PC12 cells spread on ECM may enhance dopamine secretion through facilitated vesicle fusion.
- ECM promotes dopamine secretion, while plastic supports intracellular storage, without altering overall dopamine synthesis.
- Cell morphology plays a significant role in regulating dopamine release mechanisms in PC12 cells.