TY - JOUR
T1 - Bifunctional chimeric SuperCD suicide gene - YCD: YUPRT fusion is highly effective in a rat hepatoma model
AU - Graepler, Florian
AU - Lemken, Marie Luise
AU - Wybranietz, Wolfgang A.
AU - Schmidt, Ulrike
AU - Smirnow, Irina
AU - Groß, Christine D.
AU - Spiegel, Martin
AU - Schenk, Andrea
AU - Graf, Hansjörg
AU - Lauer, Ulrike A.
AU - Vonthein, Reinhard
AU - Gregor, Michael
AU - Armeanu, Sorin
AU - Bitzer, Michael
AU - Lauer, Ulrich M.
PY - 2005/11/28
Y1 - 2005/11/28
N2 - Aim: To investigate the effects of catalytically superior gene-directed enzyme prodrug therapy systems on a rat hepatoma model. Methods: To increase hepatoma cell chemosensitivity for the prodrug 5-fluorocytosine (5-FC), we generated a chimeric bifunctional SuperCD suicide gene, a fusion of the yeast cytosine deaminase (YCD) and the yeast uracil phosphoribosyltransferase (YUPRT) gene. Results: In vitro stably transduced Morris rat hepatoma cells (MH) expressing the bifunctional SuperCD suicide gene (MH SuperCD) showed a clearly marked enhancement in cell killing when incubated with 5-FC as compared with MH cells stably expressing YCD solely (MH YCD) or the cytosine deaminase gene of bacterial origin (MH BCD), respectively. In vivo, MH SuperCD tumors implanted both subcutaneously as well as orthotopically into the livers of syngeneic ACI rats demonstrated significant tumor regressions (P<0.01) under both high dose as well as low dose systemic 5-FC application, whereas MH tumors without transgene expression (MH naïve) showed rapid progression. For the first time, an order of in vivo suicide gene effectiveness (SuperCD>> YCD>>BCD>>>negative control) was defined as a result of a direct in vivo comparison of all three suicide genes. Conclusion: Bifunctional SuperCD suicide gene expression is highly effective in a rat hepatoma model, thereby significantly improving both the therapeutic index and the efficacy of hepatocellular carcinoma killing by fluorocytosine.
AB - Aim: To investigate the effects of catalytically superior gene-directed enzyme prodrug therapy systems on a rat hepatoma model. Methods: To increase hepatoma cell chemosensitivity for the prodrug 5-fluorocytosine (5-FC), we generated a chimeric bifunctional SuperCD suicide gene, a fusion of the yeast cytosine deaminase (YCD) and the yeast uracil phosphoribosyltransferase (YUPRT) gene. Results: In vitro stably transduced Morris rat hepatoma cells (MH) expressing the bifunctional SuperCD suicide gene (MH SuperCD) showed a clearly marked enhancement in cell killing when incubated with 5-FC as compared with MH cells stably expressing YCD solely (MH YCD) or the cytosine deaminase gene of bacterial origin (MH BCD), respectively. In vivo, MH SuperCD tumors implanted both subcutaneously as well as orthotopically into the livers of syngeneic ACI rats demonstrated significant tumor regressions (P<0.01) under both high dose as well as low dose systemic 5-FC application, whereas MH tumors without transgene expression (MH naïve) showed rapid progression. For the first time, an order of in vivo suicide gene effectiveness (SuperCD>> YCD>>BCD>>>negative control) was defined as a result of a direct in vivo comparison of all three suicide genes. Conclusion: Bifunctional SuperCD suicide gene expression is highly effective in a rat hepatoma model, thereby significantly improving both the therapeutic index and the efficacy of hepatocellular carcinoma killing by fluorocytosine.
UR - http://www.scopus.com/inward/record.url?scp=30144443102&partnerID=8YFLogxK
U2 - 10.3748/wjg.v11.i44.6910
DO - 10.3748/wjg.v11.i44.6910
M3 - Journal articles
C2 - 16437592
AN - SCOPUS:30144443102
SN - 1007-9327
VL - 11
SP - 6910
EP - 6919
JO - World Journal of Gastroenterology
JF - World Journal of Gastroenterology
IS - 44
ER -
