Anti-cancer effect of metformin on the metastasis and invasion of primary breast cancer cells through mediating NF-kB activity.
Acta Histochem
; 123(4): 151709, 2021 May.
Article
in En
| MEDLINE
| ID: mdl-33711726
ABSTRACT
Current evidence strongly suggests that aberrant activation of the nuclear factor kappa B (NF-kB) signaling cascade is connected to carcinogenesis. The matrix metalloproteinases (MMP) which are also the key agents for tumor metastasis may be potent candidates for tumor diagnosis in clinics. In this in vitro study, we hypothesized that metformin with an effective dose can inhibit tumor cell proliferation and metastasis by modulating the expressions of MMP-2 and -9 and interfering with NF-kB signaling in primary breast cancer cells (PBCCs). 300 000 cells per ml were obtained from biopsies of breast tumors from five human donors. The cell viability and proliferation were tested. Immunocytochemistry was performed for MMP-2, MMP-9, and NF-kB, and enzyme-linked immunosorbent assay for NF-kB activity, quantitative real-time PCR for RELA/p65, IkBα, MMP-2, and MMP-9. Three different doses of metformin (5, 10, and 25â¯mM) (Met) reduced the viability and proliferation of PBCCs in a dose-dependent manner, maximum inhibition was observed at 25â¯mM Met. The expression of RELA/p65 was not affected by 25â¯mM Met. Nuclear immunoreactivity and activity of NF-kB reduced while cytoplasmic NF-kB (p65) elevated by 25â¯mM Met compared to non-treatment (Pâ¯<⯠0.05). The expression and immunoreactivity of MMP-9 but not MMP-2 were decreased by 25 mM Met treatment, compared with the non-treatment (Pâ¯<⯠0.05). Metformin may have an essential antitumor role in the invasion and metastasis pathways of PBCCs by downregulating the MMP-9 expression blocking both the activity and nuclear translocation of NF-kB.
Key words
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Breast Neoplasms
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Signal Transduction
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NF-kappa B
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Metformin
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Neoplasm Proteins
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Antineoplastic Agents
Limits:
Female
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Humans
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Middle aged
Language:
En
Journal:
Acta Histochem
Year:
2021
Type:
Article