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A rapid and sensitive bioassay to measure bone morphogenetic protein activity
Lior Zilberberg1, Peter ten Dijke, Lynn Y Sakai
1Department of Cell Biology, New York University School of Medicine, New York, New York 10016, USA. zilbel01@med.nyu.edu
BMC Cell Biology
|September 21, 2007
Summary
A new cell-based assay offers a rapid and sensitive method for quantifying bone morphogenetic protein (BMP) activity. This assay detects BMP-4 at picomolar levels, overcoming limitations of traditional alkaline phosphatase assays.
Area of Science:
- Biochemistry
- Molecular Biology
- Cell Biology
Background:
- Bone morphogenetic proteins (BMPs) are TGF-beta superfamily members crucial for development and tissue regulation.
- Current alkaline phosphatase (ALP) assays for BMP activity lack speed and sensitivity for physiological measurements.
- A need exists for a more efficient method to quantify BMP activity.
Purpose of the Study:
- To develop a highly sensitive, rapid, and specific cell-based assay for quantifying BMP activity.
- To establish a reliable method for measuring BMPs at physiological concentrations.
Main Methods:
- Stable transfection of C2C12 and HepG2 cell lines with a reporter plasmid containing BMP-responsive elements (Id1 promoter) linked to a luciferase gene.
- Quantification of luciferase expression using a luminometer upon BMP exposure.
Main Results:
- The developed bioassay is specific for BMPs.
- The assay can detect BMP-4 activity as low as 3 pM.
- Related TGF-beta family members do not induce reporter gene expression.
Conclusions:
- The new assay provides a rapid (under 24 hours) and efficient method for measuring BMP activity.
- This assay is suitable for complex solutions and cell culture applications.
- It offers a significant improvement over existing BMP activity assays.
