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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
Characterization and Validation of Antibodies for Immunohistochemical Staining of the Chemokine CXCL12.
Journal of Histochemistry and Cytochemistry : Official Journal of the Histochemistry Society 2019 April
Chemokines and their receptors have been implicated in cancer biology. The CXCL12/CXCR4 axis is essential for the homing and retention of hematopoietic stem cells in bone marrow niches, and has a significant role in neonatal development. It is also implicated in multiple facets of cancer biology including metastasis, angiogenesis/neo-vasculogenesis, and immune cell trafficking at the tumor microenvironment (TME). Immunohistochemistry (IHC) is an ideal method for investigating involvement of CXCL12 in the TME. Three antibodies were evaluated here for their suitability to stain CXCL12. Both D8G6H and K15C gave apparent specific staining in both lymphoid and tumor tissue, but with converse staining patterns. D8G6H stained cells in the parafollicular zone whereas K15C showed staining of lymphoid cells in the interfollicular zone of tonsil tissue. Using a cell line with high CXCL12 expression, TOV21G, as a positive control, it was found that D8G6H gave strong staining of TOV21G cells whereas no staining was observed with K15C indicating that D8G6H specifically stains CXCL12. Significant staining of CXCL12 in the ovarian TME using tissue microarray was observed using D8G6H. These data demonstrate the importance of antibody characterization for IHC applications, and provide further evidence for the involvement of CXCL12 in ovarian cancer biology.
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