Stimulation of colorectal cancer cell line growth by ET-1 and its inhibition by ET(A) antagonists.
Gut
; 47(5): 685-8, 2000 Nov.
Article
en En
| MEDLINE
| ID: mdl-11034585
ABSTRACT
BACKGROUND:
The vasoactive peptide endothelin 1 (ET-1) acts via two receptors, endothelin receptors A (ET(A)) and B (ET(B)). ET-1 is overexpressed by human cancers in vivo and in vitro and may be mitogenic for cancer cells.METHOD:
To elucidate if ET-1 is a growth regulator the following were investigated in human colorectal cancer cell lines (LIM1215 and HT29) ET-1 production by ELISA; ET receptor expression using radioligand autoradiographic techniques; and responsiveness to ET-1, and to ET(A) and ET(B) antagonism by growth measurements.RESULTS:
ET-1 was produced by LIM1215 and HT29 cells (21.3 and 41.7 fmol/ml/10(6) cells (24 hours); 22.6 and 71.7 fmol/ml/10(6) cells (48 hours), respectively). ET(A) and ET(B) receptors were expressed by both cell lines. Addition of ET-1 resulted in a dose dependent increase in cell numbers which was significant at 10(-8)-10(-9) M for LIM1215, with the greatest increase at 10(-8) M (32.7% and 28.4% increase above controls at 48 hours and 72 hours; p<0.05) and at 10(-8)-10(-9) M for HT29, with the greatest increase at 10(-9) M (13.4% and 15.7% increase above controls at 48 hours and 72 hours; p<0.05). ET(A) antagonists BQ123 and BQ610, but not the ET(B) antagonist BQ788, inhibited ET-1 induced proliferation of both LIM1215 and HT29 (p<0.05).CONCLUSION:
ET-1 can stimulate the proliferation of colorectal cancer cell lines via the ET(A), but not the ET(B), receptor.
Texto completo:
1
Colección:
01-internacional
Asunto principal:
Neoplasias Colorrectales
/
Endotelina-1
/
Proteínas de Neoplasias
Límite:
Humans
Idioma:
En
Revista:
Gut
Año:
2000
Tipo del documento:
Article
País de afiliación:
Reino Unido