Inflammatory macrophage derived TNFα downregulates estrogen receptor α via FOXO3a inactivation in human breast cancer cells

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T1 - Inflammatory macrophage derived TNFα downregulates estrogen receptor α via FOXO3a inactivation in human breast cancer cells

AU - Gunnarsdóttir, Frida Björk

AU - Hagerling, Catharina

AU - Bergenfelz, Caroline

AU - Mehmeti, Meliha

AU - Källberg, Eva

AU - Allaoui, Roni

AU - Mohlin, Sofie

AU - Påhlman, Sven

AU - Larsson, Christer

AU - Jirström, Karin

AU - Bexell, Daniel

AU - Leandersson, Karin

PY - 2020/5/1

Y1 - 2020/5/1

N2 - Patients with estrogen receptor α positive (ERα+) breast cancer can respond to endocrine therapy, but treatment resistance is common and associated with downregulation of ERα expression in the dormant residual cells. Here we show, using long-term NSG xenograft models of human breast cancer and primary human monocytes, in vitro primary cell cultures and tumors from breast cancer patients, that macrophage derived tumor necrosis factor alpha (TNFα) downregulates ERα in breast cancer cells via inactivation of the transcription factor Forkhead box O transcription factor 3a (FOXO3a). Moreover, presence of tumor associated macrophages in the primary tumor of breast cancer patients, was associated with ERα negativity, and with worse prognosis in patients with ERα+ tumors. We propose that pro-inflammatory macrophages, despite being tumoricidal, may have direct effects on tumor progression and endocrine resistance in breast cancer patients. Our findings suggest that TNFα antagonists should be evaluated for treatment of ERα+ breast cancer.

AB - Patients with estrogen receptor α positive (ERα+) breast cancer can respond to endocrine therapy, but treatment resistance is common and associated with downregulation of ERα expression in the dormant residual cells. Here we show, using long-term NSG xenograft models of human breast cancer and primary human monocytes, in vitro primary cell cultures and tumors from breast cancer patients, that macrophage derived tumor necrosis factor alpha (TNFα) downregulates ERα in breast cancer cells via inactivation of the transcription factor Forkhead box O transcription factor 3a (FOXO3a). Moreover, presence of tumor associated macrophages in the primary tumor of breast cancer patients, was associated with ERα negativity, and with worse prognosis in patients with ERα+ tumors. We propose that pro-inflammatory macrophages, despite being tumoricidal, may have direct effects on tumor progression and endocrine resistance in breast cancer patients. Our findings suggest that TNFα antagonists should be evaluated for treatment of ERα+ breast cancer.

KW - Breast cancer

KW - Endocrine resistance

KW - Estrogen receptor

KW - FOXO3a

KW - Macrophage

KW - TNFalpha

UR - http://www.scopus.com/inward/record.url?scp=85081264612&partnerID=8YFLogxK

U2 - 10.1016/j.yexcr.2020.111932

DO - 10.1016/j.yexcr.2020.111932

M3 - Article

C2 - 32145253

AN - SCOPUS:85081264612

VL - 390

JO - Experimental Cell Research

JF - Experimental Cell Research

SN - 1090-2422

IS - 1

M1 - 111932

ER -