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Human PAF receptor gene expression: induction during HL-60 cell differentiation.
E Müller1, G Dupuis, S Turcotte
1Immunology Division, Faculty of Medicine, University of Sherbrooke, QC, Canada.
Biochemical and Biophysical Research Communications
|December 31, 1991
Summary
Differentiation of HL-60 cells with vitamin D3 increases platelet-activating factor (PAF) receptor expression. This suggests PAF receptor regulation occurs at the gene level during macrophage differentiation.
Area of Science:
- Immunology
- Cell Biology
- Molecular Biology
Background:
- Platelet-activating factor (PAF) is a key mediator in inflammation and immune responses.
- Cellular responses to PAF are primarily mediated by specific receptors on cell membranes.
- Receptor expression can be influenced by factors such as cell differentiation agents.
Purpose of the Study:
- To investigate the effect of cell differentiation on Platelet-Activating Factor (PAF) receptor expression.
- To determine if PAF receptor gene expression is regulated during macrophage differentiation.
Main Methods:
- Used the HL-60 human promyelocytic leukemia cell line.
- Induced differentiation towards a macrophage phenotype using 1 alpha,25(OH)2 vitamin D3.
- Assayed PAF receptor mRNA accumulation and PAF responsiveness via intracellular calcium ([Ca2+]i) fluxes.
Main Results:
- Differentiation of HL-60 cells with 1 alpha,25(OH)2 vitamin D3 led to increased PAF receptor gene expression.
- Accumulation of PAF receptor mRNA correlated with the development of PAF responsiveness.
- PAF responsiveness was observed to parallel macrophage differentiation.
Conclusions:
- PAF receptor expression is induced during the differentiation of HL-60 cells into macrophages.
- PAF responsiveness is linked to macrophage differentiation.
- Regulation of PAF receptor expression can occur at the transcriptional level.