title: Stromal cell-derived factor-1alpha-induced cell proliferation and its possible regulation by CD26/dipeptidyl peptidase IV in endometrial adenocarcinoma.
abstract: CD26/dipeptidylpeptidase IV (DPPIV) is a 110 kD membrane-bound extracellular peptidase with ubiquitous expressions, and has a variety of functional properties in the development of human malignancies as well as T-cell biology. According to recent reports, stromal cell derived factor-1alpha (SDF-1alpha), which is a good substrate for CD26/DPPIV, is expressed in various solid tumors and is involved in tumor development or metastasis. We investigated the expression of SDF-1alpha and its corresponding receptor, CXCR4, in human endometrial carcinoma (EMCA) tissues and the function of SDF-1alpha on EMCA cells with its regulation by CD26/DPPIV. We demonstrated that SDF-1alpha and CXCR4 were expressed in human EMCA, and these immunoreactivities were significantly low in Grade 3 EMCA, which was similar to that of CD26/DPPIV, compared to those in Grade 1 and Grade 2. Additionally, exogenous SDF-1alpha concentration was significantly lower in CD26/DPPIV-transfected EMCA cells than that in vector-transfected cells. Moreover, exogenous SDF-1alpha significantly stimulated cell proliferation in vector-transfected cells in a concentration dependent manner. In contrast, in CD26/DPPIV-transfected cells, there was no apparent effect on proliferation shown by the addition of exogenous SDF-1alpha. This is the first report showing a direct link between the SDF-1alpha/CXCR4 pathway with CD26/DPPIV in solid tumors, suggesting that CD26/DPPIV is likely to directly modulate various SDF-1alpha induced functions.
authors.affiliation: Department of Obstetrics and Gynecology, Nagoya University Graduate School of Medicine, Showa-ku, Nagoya, Japan.
authors.forename: Yayoi
authors.initials: Y
authors.lastname: Mizokami
authors.forename: Hiroaki
authors.initials: H
authors.lastname: Kajiyama
authors.forename: Kiyosumi
authors.initials: K
authors.lastname: Shibata
authors.forename: Kazuhiko
authors.initials: K
authors.lastname: Ino
authors.forename: Fumitaka
authors.initials: F
authors.lastname: Kikkawa
authors.forename: Shigehiko
authors.initials: S
authors.lastname: Mizutani
mesh_terms: D000230:Adenocarcinoma / Q000378:metabolism*; D015153:Blotting, Western; D002455:Cell Division; D045744:Cell Line, Tumor; D002469:Cell Separation; D054377:Chemokine CXCL12; D019743:Chemokines, CXC / Q000378:metabolism*; D018819:Dipeptidyl Peptidase 4 / Q000378:metabolism*; D004305:Dose-Response Relationship, Drug; D016889:Endometrial Neoplasms / Q000378:metabolism*; D005260:Female; D005434:Flow Cytometry; D006801:Humans; D007150:Immunohistochemistry; D009362:Neoplasm Metastasis; D010957:Plasmids / Q000378:metabolism; D019718:Receptors, CXCR4 / Q000378:metabolism; D020133:Reverse Transcriptase Polymerase Chain Reaction; D013601:T-Lymphocytes / Q000378:metabolism; D013997:Time Factors; D014162:Transfection
chemical_list: C515255:CXCL12 protein, human; D054377:Chemokine CXCL12; D019743:Chemokines, CXC; D019718:Receptors, CXCR4; D018819:Dipeptidyl Peptidase 4