Furosemide, a blocker of Na+/K+/2Cl- cotransporter, diminishes proliferation of poorly differentiated human gastric cancer cells by affecting G0/G1 state.
Furosemide, a blocker of Na(+)/K(+)/2Cl(-) cotransporter (NKCC), is often used as a diuretic to improve edema, ascites, and pleural effusion of patients with cancers. The aim of the present study was to investigate whether an NKCC blocker affects cancer cell growth. If so, we would clarify the mechanism of this action. We found that poorly differentiated gastric adenocarcinoma cells (MKN45) expressed the mRNA of NKCC1 three times higher than moderately differentiated ones (MKN28) and that the NKCC in MKN45 showed higher activity than that in MKN28. A cell proliferation assay indicates that furosemide significantly inhibited cell growth in MKN45 cells, but not in MKN28 cells. Using flow cytometrical analysis, we found that the exposure to furosemide brought MKN45 cells to spend more time at the G(0)/G(1) phase, but not MKN28 cells. Based on these observations, we indicate that furosemide diminishes cell growth by delaying the G(1)-S phase progression in poorly differentiated gastric adenocarcinoma cells, which show high expression and activity of NKCC, but not in moderately differentiated gastric adenocarcinoma cells with low expression and NKCC activity.
Shiozaki
Atsushi
A
Department of Molecular Cell Physiology, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto, 602-8566 Japan.
Miyazaki
Hiroaki
H
Niisato
Naomi
N
Nakahari
Takashi
T
Iwasaki
Yoshinobu
Y
Itoi
Hirosumi
H
Ueda
Yuji
Y
Yamagishi
Hisakazu
H
Marunaka
Yoshinori
Y
D000230:Adenocarcinoma / Q000473:pathology*; D002453:Cell Cycle / Q000187:drug effects; D002454:Cell Differentiation / Q000187:drug effects; D045744:Cell Line, Tumor; D049109:Cell Proliferation / Q000187:drug effects*; D005665:Furosemide / Q000494:pharmacology*; D016193:G1 Phase / Q000187:drug effects; D006801:Humans; D012333:RNA, Messenger / Q000378:metabolism; D016192:Resting Phase, Cell Cycle / Q000187:drug effects; D049994:Sodium Potassium Chloride Symporter Inhibitors / Q000494:pharmacology*; D028021:Sodium-Potassium-Chloride Symporters / Q000378:metabolism; D013274:Stomach Neoplasms / Q000473:pathology*
D012333:RNA, Messenger; D049994:Sodium Potassium Chloride Symporter Inhibitors; D028021:Sodium-Potassium-Chloride Symporters; D005665:Furosemide