Abstract
The aryl hydrocarbon receptor (AhR) has been best known for its role in mediating the toxicity of dioxin. Here we show that AhR overexpression is found among estrogen receptor (ER)α-negative human breast tumors and that its overexpression is positively correlated to that of the NF-κB subunit RelB and Interleukin (IL)-8. Increased DNA binding activity of the AhR and RelB is coupled to IL-8 overexpression in primary breast cancer tissue, which was also supported by in situ hybridization. Activation of AhR in vitro by 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) induced IL-8 expression in MDA-MB 436 and MCF-7 cells in an AhR and RelB dependent manner. Consistently, downregulation of RelB or AhR by small interfering RNAs (siRNA) decreased the level of IL-8 but increased expression of ERα in vitro in MCF-7 cells. Our results strongly suggest that RelB and AhR have a critical role in the regulation of IL-8 and reveal a supportive role of RelB and AhR in the anti-apoptotic response in human breast cancer cells. AhR and RelB may present a novel therapeutic target for inflammatory driven breast carcinogenesis and tumor progression. Overexpression of pro-survival factors AhR and RelB may explain the process of the development of environmentally-induced type of breast cancers.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 78-86 |
| Number of pages | 9 |
| Journal | Archives of Biochemistry and Biophysics |
| Volume | 512 |
| Issue number | 1 |
| DOIs | |
| State | Published - Aug 1 2011 |
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Keywords
- AhR
- Breast cancer
- IL-8
- NF-κB
- RelB
- TCDD
ASJC Scopus subject areas
- Biochemistry
- Biophysics
- Molecular Biology
Cite this
Interaction of aryl hydrocarbon receptor and NF-κB subunit RelB in breast cancer is associated with interleukin-8 overexpression. / Vogel, Christoph Franz Adam; Li, Wen; Wu, Dalei; Miller, Jamie K.; Sweeney, Colleen A; Lazennec, Gwendal; Fujisawa, Yasuko; Matsumura, Fumio.
In: Archives of Biochemistry and Biophysics, Vol. 512, No. 1, 01.08.2011, p. 78-86.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Interaction of aryl hydrocarbon receptor and NF-κB subunit RelB in breast cancer is associated with interleukin-8 overexpression
AU - Vogel, Christoph Franz Adam
AU - Li, Wen
AU - Wu, Dalei
AU - Miller, Jamie K.
AU - Sweeney, Colleen A
AU - Lazennec, Gwendal
AU - Fujisawa, Yasuko
AU - Matsumura, Fumio
PY - 2011/8/1
Y1 - 2011/8/1
N2 - The aryl hydrocarbon receptor (AhR) has been best known for its role in mediating the toxicity of dioxin. Here we show that AhR overexpression is found among estrogen receptor (ER)α-negative human breast tumors and that its overexpression is positively correlated to that of the NF-κB subunit RelB and Interleukin (IL)-8. Increased DNA binding activity of the AhR and RelB is coupled to IL-8 overexpression in primary breast cancer tissue, which was also supported by in situ hybridization. Activation of AhR in vitro by 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) induced IL-8 expression in MDA-MB 436 and MCF-7 cells in an AhR and RelB dependent manner. Consistently, downregulation of RelB or AhR by small interfering RNAs (siRNA) decreased the level of IL-8 but increased expression of ERα in vitro in MCF-7 cells. Our results strongly suggest that RelB and AhR have a critical role in the regulation of IL-8 and reveal a supportive role of RelB and AhR in the anti-apoptotic response in human breast cancer cells. AhR and RelB may present a novel therapeutic target for inflammatory driven breast carcinogenesis and tumor progression. Overexpression of pro-survival factors AhR and RelB may explain the process of the development of environmentally-induced type of breast cancers.
AB - The aryl hydrocarbon receptor (AhR) has been best known for its role in mediating the toxicity of dioxin. Here we show that AhR overexpression is found among estrogen receptor (ER)α-negative human breast tumors and that its overexpression is positively correlated to that of the NF-κB subunit RelB and Interleukin (IL)-8. Increased DNA binding activity of the AhR and RelB is coupled to IL-8 overexpression in primary breast cancer tissue, which was also supported by in situ hybridization. Activation of AhR in vitro by 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) induced IL-8 expression in MDA-MB 436 and MCF-7 cells in an AhR and RelB dependent manner. Consistently, downregulation of RelB or AhR by small interfering RNAs (siRNA) decreased the level of IL-8 but increased expression of ERα in vitro in MCF-7 cells. Our results strongly suggest that RelB and AhR have a critical role in the regulation of IL-8 and reveal a supportive role of RelB and AhR in the anti-apoptotic response in human breast cancer cells. AhR and RelB may present a novel therapeutic target for inflammatory driven breast carcinogenesis and tumor progression. Overexpression of pro-survival factors AhR and RelB may explain the process of the development of environmentally-induced type of breast cancers.
KW - AhR
KW - Breast cancer
KW - IL-8
KW - NF-κB
KW - RelB
KW - TCDD
UR - http://www.scopus.com/inward/record.url?scp=79959819008&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=79959819008&partnerID=8YFLogxK
U2 - 10.1016/j.abb.2011.05.011
DO - 10.1016/j.abb.2011.05.011
M3 - Article
C2 - 21640702
AN - SCOPUS:79959819008
VL - 512
SP - 78
EP - 86
JO - Archives of Biochemistry and Biophysics
JF - Archives of Biochemistry and Biophysics
SN - 0003-9861
IS - 1
ER -