Title:The Therapeutic Activities of Metformin: Focus on the Nrf2 Signaling
Pathway and Oxidative Stress Amelioration
Volume: 16
Author(s): Mohammad Yassin Zamanian, Lydia Giménez-Llort, Marjan Nikbakhtzadeh, Zahra Kamiab, Mahsa Heidari and Gholamreza Bazmandegan*
Affiliation:
- Clinical Research Development Unit, Ali-Ibn Abi-Talib Hospital, Rafsanjan University of Medical Sciences, Rafsanjan 7717933777, Iran.
- Department of Family Medicine, Ali-Ibn Abi-
Talib Hospital, School of Medicine, Rafsanjan University of Medical Sciences, Rafsanjan 7717933777, Iran
Keywords:
Metformin, Nrf2, oxidative stress, cancer, neuroprotective, tumor cell.
Abstract: In the present study, the health-protective and therapeutic properties of MET have
been discussed, focusing on the effect of MET on the Nrf2 expression in patients with different
pathological conditions. Metformin (MET) regulates high blood glucose, thus being an integral
part of the antidiabetic medications used to treat type 2 diabetes mellitus. It belongs to biguanide
class medications that are administered through the oral route. Moreover, the agent is widely
known for its anti-cancer, anti-oxidant, anti-inflammatory, and neuroprotective effects. The MET
modulates the nuclear factor erythroid-2 related factor-2 (Nrf2) signaling pathway, which in turn
yields the above-mentioned medical benefits to patients. The Nrf2 signaling pathways are modulated
in multiple ways described subsequently: 1) MET acts on the cancer cells and inactivates
Raf-ERK signaling, thus reducing Nrf2 expression, 2) MET obstructs the expression of proteins
that are involved in apoptosis of tumor cells and also prevents tumor cells from oxidation
through an AMPK-independent pathway; 3) MET carries out Keap1-independent mechanism for
reducing the levels of Nrf2 protein in cancer cells; 4) MET upregulates the Nrf2-mediated transcription
to stimulate the anti-oxidant process that prevents oxidative stress in cells system and
consequently gives neuroprotection from rotenone and 5) MET downregulates p65 and upregulates
Nrf2 which helps improve the angiogenesis impairment stimulated by gestational diabetes
mellitus. This article presents an analysis of the health-protective properties of MET and also
sheds light on the effect of MET on the Nrf2 expression in patients with different pathological
conditions.