Metformin: An old drug against old age and associated morbidities
Abstract
Metformin represents a striking example of a "historical nemesis" of a drug. About 40 years after its marketing in Europe, once demonstrated its efficacy and safety, metformin was registered also in the U.S. A few years later, it has become a mainstay in T2DM treatment, according to all international Scientific Societies guidelines. Today, despite the advent of new innovative drugs, metformin still persists as a first-choice drug in T2DM. This success is largely justified. In fact, over the years, also positive effects on health increased. In particular, evidence has been accumulated on a beneficial impact against many other aging-related morbidities (obesity, metabolic syndrome, cardiovascular disease, cancer, cognitive decline and mortality). This literature review describes preclinical and clinical evidence favoring the "anti-aging" therapeutic potential of metformin outside of T2DM. The rationale to the use of metformin as part of a combined therapy in a variety of clinical settings, allowing for a reduction of the chemotherapy dose in cancer patients, has also been discussed. In particular, the focus was on metformin action on RAS/RAF/MAPK pathway. In the end, the real challenge for metformin could be to fully demonstrate beneficial effects on health even in non-diabetic subjects.
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