CD36 Ectodomain Detects Apoptosis in Mammalian Cells

Area of Science:

• Cell Biology
• Biochemistry
• Immunology

Background:

• Apoptosis is characterized by phosphatidylserine (PS) exposure on the cell membrane.
• Annexin V is a common probe for detecting PS, but has limitations.
• There is a need for alternative, robust probes for apoptosis detection.

Purpose of the Study:

• To evaluate the human CD36 ectodomain (hCD36_ecto) as a probe for detecting apoptotic cells.
• To compare the efficacy of hCD36_ecto with Annexin V in apoptosis assays.
• To investigate the mechanism of hCD36_ecto binding to PS.

Main Methods:

• Flow cytometry-based assay using fluorescently labeled hCD36_ecto.
• Blocking experiments with unlabeled hCD36_ecto and a mutant form (R63A).
• Dual-staining with hCD36_ecto-FITC and Propidium Iodide (PI).

Main Results:

• hCD36_ecto effectively stains and detects apoptotic cells.
• hCD36_ecto offers advantages over Annexin V, including stability and Ca²⁺ independence.
• CD36-PS interaction is crucial for detecting apoptosis.
• hCD36_ecto can detect apoptosis in nucleated cells and eryptosis in red blood cells.

Conclusions:

• hCD36_ecto is a versatile and effective probe for detecting apoptosis in mammalian cells.
• The study highlights the utility of CD36 as a robust and economical reagent for research.
• hCD36_ecto presents a promising alternative for apoptosis detection assays.