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Antibody-mediated glycophorin C coligation on K562 cells induces phosphatidylserine exposure and cell death in an atypical apoptotic process.
MedLine Citation:
PMID:  23278312     Owner:  NLM     Status:  Publisher    
BACKGROUND: Glycophorin C (GPC) is necessary in the maintenance of red blood cell structure. Severe autoimmune hemolytic anemia and hemolytic disease of the fetus and newborn (HDFN) have been associated with Gerbich (Ge) blood group system antigens expressed on GPC. Previous in vitro studies with cord blood progenitor cells have shown that anti-Ge suppresses erythropoiesis. STUDY DESIGN AND METHODS: Here, we evaluated the K562 erythroleukemic cell line to study the cellular effects of a murine anti-GPC. Cell proliferation was evaluated after treatment with anti-GPC. Flow cytometry was used to evaluate exofacial phosphatidylserine (PS) expression and cell viability (propidium iodide binding). Cell morphology was evaluated under light microscopy with cytospin preparations stained with May-Grünwald Giemsa. RESULTS: Anti-GPC dramatically inhibited K562 proliferation and increased PS expression, consistent with cytoplasmic blebbing, suggesting evidence of apoptosis. Z-VAD-FMK, an inhibitor of classical apoptosis, was unable to reverse the suppressive effect of anti-GPC. However, hemin was able to attenuate growth suppression. CONCLUSION: Together, the data suggest that anti-GPC suppresses erythroid proliferation through the induction of nonclassical apoptosis.
Duncheng Wang; Eva Seto; Jenny Shu; Jonathan A Micieli; Bernard J Fernandes; Gregory A Denomme
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-12-24
Journal Detail:
Title:  Transfusion     Volume:  -     ISSN:  1537-2995     ISO Abbreviation:  Transfusion     Publication Date:  2012 Dec 
Date Detail:
Created Date:  2013-1-2     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0417360     Medline TA:  Transfusion     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
© 2012 American Association of Blood Banks.
Immunohematology Reference Laboratory, BloodCenter of Wisconsin, Milwaukee, Wisconsin; Pathology & Laboratory Medicine, Mount Sinai Hospital, Toronto, Ontario, Canada; Laboratory Medicine & Pathobiology, University of Toronto, Toronto, Ontario, Canada; Research & Development, Canadian Blood Services, Toronto, Ontario, Canada.
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