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Regulation of P-selectin by tumor necrosis factor-alpha
1Surgical Research Laboratory, Children's Hospital, Boston, Massachusetts, USA.
Abstract:
The levels of P-selectin mRNA and polypeptide were analyzed in bovine capillary cells treated with or without the cytokine tumor necrosis factor-alpha. The 3 kb P-selectin mRNA was upregulated three- to five-fold in cytokine-stimulated cells. The increase in mRNA correlated with a dramatic but short-lived increase in P-selectin polypeptide as determined by metabolic-labeling and immunoadsorption. These data confirm earlier studies on mouse P-selectin expressed in a mouse endothelioma cell line and further indicate that P-selectin function can be regulated not only by rapid translocation to the cell surface but also by cytokine-stimulation of P-selectin biosynthesis.
Insights
Tumor necrosis factor-alpha significantly increases P-selectin mRNA and protein in bovine capillary cells. This cytokine stimulation enhances P-selectin biosynthesis, complementing its cell surface regulation.
Area of Science:
- Cellular Biology
- Molecular Biology
- Immunology
Background:
- P-selectin is crucial for cell adhesion and inflammatory responses.
- Its regulation is understood through cell surface translocation.
- Cytokine-mediated regulation of P-selectin biosynthesis requires further investigation.
Purpose of the Study:
- To analyze P-selectin mRNA and polypeptide levels in bovine capillary cells.
- To investigate the effect of tumor necrosis factor-alpha on P-selectin expression.
- To explore cytokine-stimulated regulation of P-selectin biosynthesis.
Main Methods:
- Bovine capillary cells were treated with or without tumor necrosis factor-alpha.
- P-selectin mRNA levels were quantified.
- P-selectin polypeptide expression was analyzed using metabolic labeling and immunoadsorption.
Main Results:
- Tumor necrosis factor-alpha upregulated P-selectin mRNA by three- to five-fold.
- A rapid, transient increase in P-selectin polypeptide was observed.
- The mRNA increase correlated with the polypeptide level changes.
Conclusions:
- Cytokine stimulation, specifically tumor necrosis factor-alpha, upregulates P-selectin biosynthesis.
- P-selectin function is regulated by both rapid cell surface translocation and cytokine-induced biosynthesis.
- These findings in bovine cells align with previous studies in mouse models.