Characterization of a pan-species reactive monoclonal antibody specific for a cell surface epitope which could serve as a marker for human monocytic and megakaryocytic differentiation

Chew Shun Chang, Grant McFadden

Research output: Contribution to journalArticle


A mouse IgG1-producing hybridoma, CSC-31, was isolated and characterized. The monoclonal antibody (MAb) was originally raised against monkey kidney cell-surface molecules. FACS analysis further showed that CSC-31 exhibited broad tissue and species reactivity. Although most human T- and B-cell lines failed to react with CSC-31, myeloid, and erythroleukemia cells lines such as THP-1 and K562 expressed the CSC-31 cell surface marker. Furthermore, in vitro differentiation of HL-60, U-937, and K562 showed that expression of the CSC-31 marker is associated with monocytic or megakaryocytic differentiation. However, up-regulation of the CSC-31 marker expression was not detected during granulocytic or erythroid differentiation. Through the in vitro differentiation of K562, it was demonstrated that up-regulation of the CSC-31 marker required novel PKCs and might be regulated by the MAPK signaling pathway. Last, limited biochemical analysis demonstrated that the CSC-31-specific epitope is sensitive to digestion by papain yet highly resistant to other proteases.

Original languageEnglish (US)
Pages (from-to)445-456
Number of pages12
JournalHybridoma and Hybridomics
Issue number6
StatePublished - Dec 2002
Externally publishedYes


ASJC Scopus subject areas

  • Immunology
  • Genetics

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