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RJ Slappendel, W Renooij and JJ de Bruijne
Department of Clinical Sciences of Companion Animals, Faculty of Veterinary
Medicine, University of Utrecht, The Netherlands.
Examination of the red blood cells (RBCs) of eight dogs with familial
stomatocytosis-hypertrophic gastritis (FS-HG), a multiorgan disease
associated with hemolytic anemia, hereditary stomatocytosis (HSt), and
hypertrophic gastritis resembling Menetrier's disease in man, showed
abnormal osmotic fragility, normal mean corpuscular volume, slightly
increased cell water, and normal cation content and cation fluxes.
Cholesterol was decreased in RBC and increased in plasma. In both RBCs and
plasma, total phospholipid (PL) was normal, phosphatidylcholine (PC)
decreased, and sphingomyelin increased. The palmitic acid content of PC was
increased, and the stearic acid content of PC was decreased. Sodium dodecyl
sulfate electrophoresis of RBC membrane proteins was normal. These findings
have not been described previously in HSt. They suggest that in FS-HG,
abnormal composition of the PL in RBCs secondary to abnormal PL in plasma
causes defective membrane function and stomatocytic shape-change. This
conclusion was supported by a shortened half-life of 51Cr-labeled RBCs from
normal dogs after transfusion in dogs with FS-HG. It was concluded (1) that
not all hereditary forms of stomatocytosis are necessarily associated with
an intrinsic structural defect of the RBC membrane, but that the change in
shape of RBC may also be induced by abnormal composition of the plasma; (2)
that stomatocytosis may be caused by loss of membrane surface area rather
than by the increased cation uptake such as has been shown in some human
kindreds with HSt, (3) that FS-HG is a disorder of lipid metabolism, and by
consequence, (4) that abnormal lipid metabolism might be involved in the
pathogenesis of Menetrier's disease.
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| Copyright © 1994 by American Society of Hematology Online ISSN: 1528-0020 | |||||||||