PML protein analysis using imaging flow cytometry
Lizz Grimwade1, Emma Gudgin, David Bloxham
1Haemato-Oncology Diagnostics Service, Department of Haematology, Addenbrooke's Hospital, Cambridge, UK. lizz.grimwade@addenbrookes.nhs.uk
Abstract:
Acute promyelocytic leukaemia (APML) can be promptly diagnosed by detecting abnormal diffuse staining patterns of PML bodies in abnormal promyelocytes using immunofluorescence microscopy. However, this technique is subjective, with low sensitivity. Using samples from 18 patients with acute myeloid leukaemia (AML) (including four with APML), the authors investigated whether imaging flow cytometry could be a viable alternative to this current technique and improve sensitivity levels. Bone marrow/peripheral blood cells were stained with an antibody to PML, and data were acquired on an ImageStream (Amnis Corporation, Seattle, Washington, USA). Using the modulation feature for data analysis, the authors demonstrated that this technique could successfully identify cases of APML. Imaging flow cytometry, by analysing greater numbers of cells and with the potential to include disease-specific antigens, increases the sensitivity of the current immunofluorescence technique. Imaging flow cytometry is an exciting technology that has many possible applications in the diagnosis of haematological malignancies, including the potential to integrate modalities.
Insights
Imaging flow cytometry offers a more sensitive and objective method for diagnosing acute promyelocytic leukaemia (APML) compared to traditional immunofluorescence microscopy. This advanced technique enhances diagnostic accuracy for APML and other blood cancers.
Area of Science:
- Hematology
- Cellular Biology
- Diagnostic Technology
Background:
- Acute promyelocytic leukaemia (APML) diagnosis relies on immunofluorescence microscopy to detect abnormal PML bodies.
- Current immunofluorescence methods are subjective and have limited sensitivity for APML detection.
Purpose of the Study:
- To evaluate imaging flow cytometry as a more sensitive and objective alternative to immunofluorescence microscopy for APML diagnosis.
- To assess the potential of imaging flow cytometry in improving the detection rates of APML.
Main Methods:
- Bone marrow and peripheral blood cells from 18 acute myeloid leukaemia (AML) patients (including 4 APML cases) were analyzed.
- Cells were stained with an anti-PML antibody, and data were acquired using an ImageStream imaging flow cytometer.
- The modulation feature of the imaging flow cytometry system was utilized for data analysis.
Main Results:
- Imaging flow cytometry successfully identified cases of APML.
- The technique demonstrated increased sensitivity compared to conventional immunofluorescence microscopy by analyzing a larger cell population.
- The potential for incorporating disease-specific antigens was highlighted for enhanced diagnostic capability.
Conclusions:
- Imaging flow cytometry is a viable and sensitive alternative for diagnosing APML.
- This technology offers significant potential for improving the diagnosis of haematological malignancies.
- Further applications of imaging flow cytometry in clinical diagnostics are anticipated.
