Surface Receptor Loss Due to Temperature Exposure (Flow Cytometry (Sample Considerations))

Question

Accepted Answer

Chemokine and cytokine receptors (CCR7, CD115/M-CSFR) show unexpectedly low or negative staining. Signal loss occurs after sample handling at non-optimal temperatures. Common causes: 1) Exposure to low temperatures (e.g., 4°C ice incubation) triggers rapid internalization of chemokine receptors 2) Exposure to high temperatures (e.g., >25°C room temperature) accelerates cytokine receptor endocytosis 3) Labile surface receptors (CCR7, CD115) are particularly sensitive to temperature fluctuations 4) Extended processing time at incorrect temperature depletes surface-accessible epitopes Solutions: 1) Maintain samples at optimal temperature (typically room temperature 20-25°C) for chemokine/cytokine receptor staining 2) Minimize processing time between sample preparation and antibody staining 3) Perform staining immediately after sample collection for temperature-sensitive receptors 4) Consult BioLegend technical support blog on chemokine receptor staining for receptor-specific protocols 5) Add receptor internalization inhibitors (e.g., sodium azide 0.02-0.1%) if compatible with downstream analysis