PMID: 11920461Mar 29, 2002Paper

Coexpression of ephrin-Bs and their receptors in colon carcinoma

Cancer
Wenbiao LiuLee M Ellis

Abstract

The erythropoietin-producing hepatoma amplified sequence (Eph) family is the largest subfamily of receptor tyrosine kinases (RTKs). The Ephs (receptors) bind to specific cell-bound ligands, called ephrins. The binding of this ligand-receptor system is dependent on cell-cell interactions. The ephrin-Eph system is important in embryologic development and differentiation of the nervous and vascular systems. In the current study, the authors hypothesized that ephrins may play a role in the growth and development of colon carcinoma and may be expressed differentially in normal and malignant colonic tissues. Reverse transcriptase-polymerase chain reaction (RT-PCR), Northern Blot analyses, and immunohistochemistry were used to examine 11 colon carcinoma cell lines and 20 human colon carcinoma specimens with adjacent uninvolved mucosa for the expression of EphB and ephrin-B family members. EphB2, EphB3, and EphB4 mRNA expression and ephrin-B2 mRNA expression was detected in all the cell lines and colon carcinoma specimens examined. Immunohistochemical analysis showed that ephrin-B2 had higher expression in the colon carcinoma specimens studied than in adjacent normal mucosa. Ephrin-B2 and EphB4 most frequently were expressed on the lum...Continue Reading

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