Detection of alternatively spliced EMR2 mRNAs in colorectal tumor cell lines but rare expression of the molecule in colorectal adenocarcinomas.
EMR2 and CD97, members of the epidermal growth factor (EGF)-TM7 family, show a very high homology. CD97, whose expression is closely related to clinical tumor stage in colorectal carcinomas, potentially functions as an adhesion molecule. Nothing is known about the presence of EMR2 in these tumors. We systematically examined the expression of EMR2 in colorectal carcinoma cell lines and adenocarcinomas. Of 18 cell lines, 10 were only slightly positive for EMR2 according to flow cytometry. Various EMR2 splice variants, including a new isoform, have been detected at the mRNA level. EMR2 expression did not correlate with in vitro migration or invasion capacity of the cell lines. Normal colorectal epithelial cells were EMR2 negative. In contrast to CD97, which is found in most colorectal adenocarcinomas, only 8 of 81 of these tumors expressed EMR2. No correlation was found between EMR2 expression and clinicopathological parameters of the tumors. In summary, a significant but low number of colorectal carcinomas are positive for EMR2, indicating different roles for this molecule and CD97 in these tumors.
Aust
Gabriela
G
Institute of Anatomy, University of Leipzig, Ph.-Rosenthal-Strasse 55, 04103 Leipzig, Germany. ausg@medizin.uni-leipzig.de
Hamann
Jörg
J
Schilling
Nicole
N
Wobus
Manja
M
D000230:Adenocarcinoma / Q000235:genetics / Q000378:metabolism* / Q000473:pathology; D017398:Alternative Splicing; D015703:Antigens, CD; D002465:Cell Movement; D015179:Colorectal Neoplasms / Q000235:genetics / Q000378:metabolism* / Q000473:pathology; D004815:Epidermal Growth Factor / Q000235:genetics / Q000378:metabolism*; D005434:Flow Cytometry; D015870:Gene Expression; D006801:Humans; D007124:Immunoenzyme Techniques; D008562:Membrane Glycoproteins / Q000378:metabolism; D009361:Neoplasm Invasiveness; D009367:Neoplasm Staging; D020033:Protein Isoforms / Q000235:genetics / Q000378:metabolism; D012333:RNA, Messenger / Q000378:metabolism*; D012334:RNA, Neoplasm / Q000032:analysis; D043562:Receptors, G-Protein-Coupled; D020133:Reverse Transcriptase Polymerase Chain Reaction; D014407:Tumor Cells, Cultured
C412456:ADGRE2 protein, human; C095004:ADGRE5 protein, human; D015703:Antigens, CD; D008562:Membrane Glycoproteins; D020033:Protein Isoforms; D012333:RNA, Messenger; D012334:RNA, Neoplasm; D043562:Receptors, G-Protein-Coupled; D004815:Epidermal Growth Factor