Antiproliferative and antiangiogenic activities of genistein in human renal cell carcinoma.
OBJECTIVE
To determine whether genistein, an isoflavone that is plentiful in soy beans, could inhibit the growth of human renal cell carcinoma (RCC) cells in vitro, induce apoptosis, and suppress neovascularization in vivo induced by human RCC cells.


METHODS
We investigated the effect of genistein on cell proliferation in four human RCC cell lines, SMKT R-1, R-2, R-3, and R-4. The terminal deoxynucleotidyl transferase-mediated dUTP-biotin nick end-labeling assay was performed to examine whether genistein could induce apoptosis in SMKT R-1 cells. To evaluate the effect of genistein on in vivo angiogenesis, we used a new mouse dorsal air sac model in which we could evaluate it simply and quantitatively. Radioisotope-labeled red blood cells were injected into a tail vein in mice bearing a Millipore filter chamber containing genistein, and the vascular volume was examined by measuring the radioactivity of the mouse dorsal skin.


RESULTS
Treatment with genistein for 48 hours inhibited cell proliferation in a dose-dependent manner and 100 microg/mL genistein inhibited it in a time-dependent manner. A dose of 50 microg/mL genistein clearly induced cell apoptosis. The vascular volume after implantation of the Millipore filter chamber containing RCC cells increased to threefold that without RCC cells. Genistein in the Millipore filter chamber significantly decreased the neovascularization induced by human RCC cells in vivo.


CONCLUSIONS
The results of this study demonstrated that genistein inhibited cell proliferation, induced apoptosis, and suppressed in vivo angiogenesis in human RCC cells. Genistein may be a promising antitumorigenic and antiangiogenic agent for the treatment and prevention of RCC.
Sasamura
Hiroto
H
Department of Urology, Sapporo Medical University School of Medicine, Chuo-ku, Sapporo, Japan.
Takahashi
Atsushi
A
Yuan
Jinyang
J
Kitamura
Hiroshi
H
Masumori
Naoya
N
Miyao
Noriomi
N
Itoh
Naoki
N
Tsukamoto
Taiji
T
D020533:Angiogenesis Inhibitors / Q000494:pharmacology* / Q000627:therapeutic use; D000818:Animals; D000972:Antineoplastic Agents, Phytogenic / Q000494:pharmacology* / Q000627:therapeutic use; D017209:Apoptosis / Q000187:drug effects; D002292:Carcinoma, Renal Cell / Q000098:blood supply / Q000473:pathology*; D002455:Cell Division / Q000187:drug effects; D045744:Cell Line, Tumor / Q000187:drug effects / Q000502:physiology; D015194:Diffusion Chambers, Culture; D004354:Drug Screening Assays, Antitumor; D005260:Female; D019833:Genistein / Q000494:pharmacology* / Q000627:therapeutic use; D006801:Humans; D007680:Kidney Neoplasms / Q000473:pathology*; D051379:Mice; D008810:Mice, Inbred C57BL; D009389:Neovascularization, Pathologic / Q000188:drug therapy* / Q000209:etiology
D020533:Angiogenesis Inhibitors; D000972:Antineoplastic Agents, Phytogenic; D019833:Genistein