We previously found that blood samples collected from steady-state patients with sickle cell disease (SCD) without
exposure to air contain a new type of reversibly sickled cells (RSCs) with blunt edges at a level of as high as
78%. Since partial oxygenation of once-deoxygenated sickled cells with pointy edges to near venous oxygen pressure
generates similar sickled cells with blunt edges in vitro, we named them as partially oxygenated sickled cells
(POSCs). On the other hand, partial deoxygenation of once-oxygenated SS cells to venous oxygen pressure generates
partially deoxygenated sickled cells (PDSCs) with pointy edges. In this study, we obtained blood samples
from 6 steady-state patients with SCD under venous oxygen pressure without exposure to air, subjected them to
various oxygenation/deoxygenation/reoxygenation cycles, and studied their filterability through a membrane filter
with pore diameter of 3 μm, the theoretical minimum diameter of a capillary. Our results indicated that
discocytes, POSCs with blunt edges, and irreversibly sickled cells could deform and pass through the filter,
while PDSCs with pointy edges were rigid and could not. The filterability of SS cells seems to be related to the
length and amount of deoxy-hemoglobin S fibers in the cells
We previously found that blood samples collected from steady-state patients with sickle cell disease (SCD) withoutexposure to air contain a new type of reversibly sickled cells (RSCs) with blunt edges at a level of as high as78%. Since partial oxygenation of once-deoxygenated sickled cells with pointy edges to near venous oxygen pressuregenerates similar sickled cells with blunt edges in vitro, we named them as partially oxygenated sickled cells(POSCs). On the other hand, partial deoxygenation of once-oxygenated SS cells to venous oxygen pressure generatespartially deoxygenated sickled cells (PDSCs) with pointy edges. In this study, we obtained blood samplesfrom 6 steady-state patients with SCD under venous oxygen pressure without exposure to air, subjected them tovarious oxygenation/deoxygenation/reoxygenation cycles, and studied their filterability through a membrane filterwith pore diameter of 3 μm, the theoretical minimum diameter of a capillary. Our results indicated thatdiscocytes, POSCs with blunt edges, and irreversibly sickled cells could deform and pass through the filter,while PDSCs with pointy edges were rigid and could not. The filterability of SS cells seems to be related to thelength and amount of deoxy-hemoglobin S fibers in the cells
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