RNA interference-directed caveolin-1 knockdown sensitizes SN12CPM6 cells to doxorubicin-induced apoptosis and reduces lung metastasis

Human renal cell carcinoma (HRCC) is characterized by a high level of resistance to all treatment modalities. Therefore, the investigation of global gene expression in HRCC might help understand its biologic behavior and develop treatment strategies. Using cDNA microarray analysis, we initially comp...

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Veröffentlicht in:Tumor biology 2010-12, Vol.31 (6), p.643-650
Hauptverfasser: Park, Juwon, Bae, Eunkyung, Lee, Chansu, Yoon, Sung-Soo, Chae, Yang Seok, Ahn, Kwang-Sung, Won, Nam Hee
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container_end_page 650
container_issue 6
container_start_page 643
container_title Tumor biology
container_volume 31
creator Park, Juwon
Bae, Eunkyung
Lee, Chansu
Yoon, Sung-Soo
Chae, Yang Seok
Ahn, Kwang-Sung
Won, Nam Hee
description Human renal cell carcinoma (HRCC) is characterized by a high level of resistance to all treatment modalities. Therefore, the investigation of global gene expression in HRCC might help understand its biologic behavior and develop treatment strategies. Using cDNA microarray analysis, we initially compared gene expression profiles between HRCCs and adjacent normal tissues, and found that 87 were up-regulated and 127 genes were down-regulated. Next, a subset of genes, twofold differentially expressed, were validated by Northern blotting. Unexpectedly, caveolin-1, a gene reported to be a tumor suppressor gene, was found to be up-regulated in HRCC tissues. Expression level of caveolin-1 in SN12CPM6 (high metastatic clone) was higher than in SN12C (low metastatic clone), and SN12CPM6 was more resistant to doxorubicin (DXR) than SN12C. Caveolin-1 gene was slightly induced in surviving SN12C cells after DXR treatment. Furthermore, SN12CPM6-siCav1 cells, which were transfected with siRNA of cavelon-1 gene, were more sensitive to DXR, compared to SN12CPM6, but reduction of caveolin-1 gene expression did not affect tumor formation in subcapsule of kidney and lung metastasis. On the other hand, induction of caveolin-1 gene affected the production of lung metastasis under anti-cancer drug treatment: the incidence of pulmonary metastasis was significantly lower in SCID mice injected with SN12CPM6-siCav1 cells, and the number of pulmonary nodules decreased significantly ( p  = 0.0004). The above results together suggest that caveolin-1 may confer a growth advantage to cancer cells during DXR chemotherapy and surviving HRCC cells eventually might develop lung metastasis.
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Therefore, the investigation of global gene expression in HRCC might help understand its biologic behavior and develop treatment strategies. Using cDNA microarray analysis, we initially compared gene expression profiles between HRCCs and adjacent normal tissues, and found that 87 were up-regulated and 127 genes were down-regulated. Next, a subset of genes, twofold differentially expressed, were validated by Northern blotting. Unexpectedly, caveolin-1, a gene reported to be a tumor suppressor gene, was found to be up-regulated in HRCC tissues. Expression level of caveolin-1 in SN12CPM6 (high metastatic clone) was higher than in SN12C (low metastatic clone), and SN12CPM6 was more resistant to doxorubicin (DXR) than SN12C. Caveolin-1 gene was slightly induced in surviving SN12C cells after DXR treatment. Furthermore, SN12CPM6-siCav1 cells, which were transfected with siRNA of cavelon-1 gene, were more sensitive to DXR, compared to SN12CPM6, but reduction of caveolin-1 gene expression did not affect tumor formation in subcapsule of kidney and lung metastasis. On the other hand, induction of caveolin-1 gene affected the production of lung metastasis under anti-cancer drug treatment: the incidence of pulmonary metastasis was significantly lower in SCID mice injected with SN12CPM6-siCav1 cells, and the number of pulmonary nodules decreased significantly ( p  = 0.0004). 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Therefore, the investigation of global gene expression in HRCC might help understand its biologic behavior and develop treatment strategies. Using cDNA microarray analysis, we initially compared gene expression profiles between HRCCs and adjacent normal tissues, and found that 87 were up-regulated and 127 genes were down-regulated. Next, a subset of genes, twofold differentially expressed, were validated by Northern blotting. Unexpectedly, caveolin-1, a gene reported to be a tumor suppressor gene, was found to be up-regulated in HRCC tissues. Expression level of caveolin-1 in SN12CPM6 (high metastatic clone) was higher than in SN12C (low metastatic clone), and SN12CPM6 was more resistant to doxorubicin (DXR) than SN12C. Caveolin-1 gene was slightly induced in surviving SN12C cells after DXR treatment. Furthermore, SN12CPM6-siCav1 cells, which were transfected with siRNA of cavelon-1 gene, were more sensitive to DXR, compared to SN12CPM6, but reduction of caveolin-1 gene expression did not affect tumor formation in subcapsule of kidney and lung metastasis. On the other hand, induction of caveolin-1 gene affected the production of lung metastasis under anti-cancer drug treatment: the incidence of pulmonary metastasis was significantly lower in SCID mice injected with SN12CPM6-siCav1 cells, and the number of pulmonary nodules decreased significantly ( p  = 0.0004). 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subjects Animals
Antibiotics, Antineoplastic - pharmacology
Apoptosis
Apoptosis - drug effects
Biomedical and Life Sciences
Biomedicine
Cancer Research
Carcinoma, Renal Cell - metabolism
Carcinoma, Renal Cell - pathology
Caveolin 1 - genetics
Caveolin 1 - metabolism
Cell Line, Tumor
Down-Regulation - drug effects
Doxorubicin - pharmacology
Gene expression
Humans
Kidney diseases
Kidney Neoplasms - metabolism
Kidney Neoplasms - pathology
Lung cancer
Lung Neoplasms - prevention & control
Lung Neoplasms - secondary
Metastasis
Mice
Mice, Nude
Mice, SCID
Neoplasm Metastasis - prevention & control
Research Article
RNA Interference - physiology
RNA, Small Interfering - genetics
Transfection
Transplantation, Heterologous
Up-Regulation - drug effects
title RNA interference-directed caveolin-1 knockdown sensitizes SN12CPM6 cells to doxorubicin-induced apoptosis and reduces lung metastasis
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