Publication details

c-Myb interferes with inflammatory IL1alpha-NF-kappaB pathway in breast cancer cells

Authors

DÚCKA Monika KUČERÍKOVÁ Martina TRČKA Filip ČERVINKA Jakub BIGLIERI Elisabetta ŠMARDA Jan BORSIG Lubor BENEŠ Petr KNOPFOVÁ Lucia

Year of publication 2021
Type Article in Periodical
Magazine / Source Neoplasia
MU Faculty or unit

Faculty of Science

Citation
Web https://doi.org/10.1016/j.neo.2021.01.002
Doi http://dx.doi.org/10.1016/j.neo.2021.01.002
Keywords Breast cancer; c-Myb; IL1alpha; NF-kappaB; Inflammation; Transactivation
Description The transcription factor c-Myb can be involved in the activation of many genes with protumorigenic function; however, its role in breast cancer (BC) development is still under discussion. c-Myb is considered as a tumor-promoting factor in the early phases of BC, on the other hand, its expression in BC patients relates to a good prognosis. Previously, we have shown that c-Myb controls the capacity of BC cells to form spontaneous lung metastasis. Reduced seeding of BC cells to the lungs is linked to high expression of c-Myb and a decline in expression of a specific set of inflammatory genes. Here, we unraveled a c-Myb-IL1alpha-NF-kappaB signaling axis that takes place in tumor cells. We report that an overexpression of c-Myb interfered with the activity of NF-kappaB in several BC cell lines. We identified IL1alpha to be essential for this interference since it was abrogated in the IL1alpha-deficient cells. Overexpression of IL1alpha, as well as addition of recombinant IL1alpha protein, activated NF-kappaB signaling and restored expression of the inflammatory signature genes suppressed by c-Myb. The endogenous levels of c-Myb negatively correlated with IL1alpha on both transcriptional and protein levels across BC cell lines. We concluded that inhibition of IL1alpha expression by c-Myb reduces NF-kappaB activity and disconnects the inflammatory circuit, a potentially targetable mechanism to mimic the antimetastatic effect of c-Myb with therapeutic perspective.
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