Adherence properties of hairy cells

Area of Science:

• Hematology
• Cell Biology
• Immunology

Background:

• Hairy Cell Leukemia (HCL) is a rare B-cell chronic lymphoid leukemia.
• Hairy cells (HC) exhibit unique morphological and functional characteristics.
• Understanding HC membrane properties is crucial for HCL research.

Purpose of the Study:

• To investigate the membrane properties and behavior of Hairy Cells (HC) from Hairy Cell Leukemia (HCL) patients.
• To elucidate the dynamic changes in HC morphology under different experimental conditions using scanning electron microscopy (SEM).

Main Methods:

• Studied Hairy Cells (HC) from four Hairy Cell Leukemia (HCL) patients.
• Quantified surface membrane immunoglobulins using peroxidase-labeled antibody technique.
• Utilized scanning electron microscopy (SEM) to observe HC adherence, phagocytosis, and response to trypsin treatment.

Main Results:

• HC displayed B-lymphocyte membrane properties with 20,000-40,000 immunoglobulin molecules per cell.
• SEM revealed rapid adherence to glass, phagocytosis of latex particles, and resistance to trypsin.
• Cells formed networks via intercellular connections and thin cytoplasmic projections.
• Phagocytosis induced cell swelling and a temporary smoothing of the cell surface.
• Adherent HC remained attached after trypsin treatment, despite membrane damage.

Conclusions:

• SEM analysis explains the transient loss of the 'hairy' appearance.
• HC membrane morphology is highly variable depending on culture conditions and stimulation.
• These findings highlight the dynamic nature of HC membranes in HCL.