|Year : 2020 | Volume
| Issue : 2 | Page : 81-86
Metformin: a review on its ethnobotanical source and versatile uses
Mohammad Asif1, Mrityunjoy Acharya2, Mohd Imran3
1 Department of Pharmaceutical Chemistry, Himalayan Institute of Pharmacy Research, Dehradun, Uttarakhand, India
2 Gopiballavpur Multi Super Specialty Hospital, Gopiballavpur, Jhargram, West Bengal, India
3 Department of Pharmaceutical Chemistry, Faculty of Pharmacy, Northern Border University, Rafha, Saudi Arabia
|Date of Submission||26-Sep-2019|
|Date of Acceptance||19-Dec-2019|
|Date of Web Publication||06-May-2020|
Professor & HOD Mohammad Asif
Department of Pharmaceutical Chemistry, Himalayan Institute of Pharmacy Research, Dehradun, Uttarakhand, 248009
Source of Support: None, Conflict of Interest: None
At present metformin is the core for the management of type-2 diabetes mellitus. The key clue of metformin as a hypoglycemic drug was collected from the traditional utilization of Galega officinalis for the management of diabetes. Modern study recommends several valuable activities of Metformin other than the hypoglycemic effect such as type-1 diabetes mellitus, polycystic ovary syndrome, cholesterol-lowering effect, avoidance of heart disease, age, cancer, and neuroprotection. In the present review, we are discussing about the source and versatile utilization of metformin and its outcome.
Keywords: cancer, diabetes mellitus, metformin, neuroprotective, polycystic ovary syndrome, traditional use, type-1 diabetes mellitus, type-2 diabetes mellitus
|How to cite this article:|
Asif M, Acharya M, Imran M. Metformin: a review on its ethnobotanical source and versatile uses. Egypt Pharmaceut J 2020;19:81-6
|How to cite this URL:|
Asif M, Acharya M, Imran M. Metformin: a review on its ethnobotanical source and versatile uses. Egypt Pharmaceut J [serial online] 2020 [cited 2020 Sep 18];19:81-6. Available from: http://www.epj.eg.net/text.asp?2020/19/2/81/283857
| Introduction|| |
Currently, metformin is a biguanide derivative (dimethylbiguanide), which becomes the first-line drug for type-2 diabetes mellitus (T2-DM) treatment. In the modern time, metformin becomes a well-accepted drug due to its low cost, lesser side effects, and multiple benefits in different disease states along with both types of diabetes mellitus (T1-DM and T2-DM). Traditionally, Galega officinalis (galega, goat’s rue, Italian fitch or professor-weed, French lilac) is recognized to treat diabetes in Europe and found to be well-off in Guanidine. Guanidine analogs (metformin and several non-Metformin drugs) were used for the treatment of diabetes in 1920s–1930s, but those drugs were withdrawn due to its toxicities (mainly lactic acidosis) and the better accessibility of insulin in the market. Metformin was revived in the investigation for antimalarial drugs (proguanil and chloroproguanil) in 1940s and for the duration of clinical trial, it is proved useful to treat influenza infection when it occasionally lowered the blood glucose level. Jean Sterne a French physician was first precisely used and reported metformin as an oral hypoglycemic agent to treat diabetes in 1957. But metformin get less awareness due to its less potency in comparison to other biguanide derivatives, which were progressively discontinued in the late 1970 due to their toxic effects like lactic acidosis. Metformin opposes insulin resistance and tackles hyperglycemia without weight gain or higher risk of hypoglycemia and after concentrated analysis metformin was introduced in 1995 in the USA. The UK Prospective Diabetes Study (UKPDS) in 1998 reported that long use of metformin give cardiovascular benefits, and provided a justification to accept metformin as an initial therapy to treat hyperglycemia in T2-DM  ([Figure 1]).
|Figure 1 Galega officinalis, a natural source of galegine. Metformin (a) structurally is a biguanide and it has link with guanidine (b) and galegine (c), which can both be extracted from the plant goat’s rue.|
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Versatile use of metformin
Metformin is mainly used for the cure of T-2DM, but is also used in polycystic ovary syndrome (PCOS). Outcomes emerge to be improved even in those with some extent of kidney disease, heart failure, or liver problems .
Metformin for the treatment of persons at risk for diabetes
Salpeter et al.  have reported the use of metformin in persons at risk for diabetes in The American Journal of Medicine in 2008, They observed that metformin treatment recovered weight, lipid profiles, and insulin resistance and reduces newer inception of diabetes by 40%.
Metformin for the management of type-1 diabetes mellitus
Beysel et al.  have reported that beneficial actions of metformin for the treatment of T1-DM in a BMC Endocrine Disorders Journal in 2018 reported that metformin reduced glucose level, reduced metabolic syndrome, and insulin dose necessity more than insulin treatment alone. The result was free of blood lipid enhancement or weight loss, while on average weight stay reduced with metformin–insulin remedy, whereas the average weight raised with insulin therapy alone.
Metformin for the management of type-2 diabetes mellitus
Metformin is the core of T-2DM therapy for many years. It is used for its glucose-lowering effect since 1957 in Europe and 1995 in USA. In addition, being highly efficient in improving glycemic control, metformin has also lowered the risk of hypoglycemia. Metformin remains at the top of treatment protocol for T-2DM, either as monotherapy or in combination with thiazolidinediones, sulfonylureas, and insulin. The molecular mechanism of metformin behind its valuable effect is complex and not completely recognized. Physiologically, metformin has reduced hepatic glucose production (gluconeogenesis). Gluconeogenesis is an energy-dependent course which need ATP to be brought from the mitochondria. Metformin accumulates within the mitochondria to concentrate up to 1000-fold higher than in the extracellular medium, because metformin bears a positive charge. Inside the mitochondria, metformin blocks complex I of the respiratory chain thereby inhibiting ATP formation and finally reducing gluconeogenesis .
Metformin for the management of polycystic ovary syndrome
PCOS is the common hormonal disorder among women of reproductive period and has a range of metabolic and reproductive consequences. Metformin is the first insulin sensitizing drug (ISD) that is used in PCOS to examine the responsibility of insulin resistance in the pathogenesis of the syndrome. Significant improvements in menstrual regularity and decrease in circulating androgen levels reduced the body weight . Another ISD, troglitazone was used in the development of cycle regularity and serum androgen levels in spite of lack of change in body weight . Numerous studies have reported contradictory facts concerning the effect of metformin in PCOS. In several meta-analyses, the available facts have been reported with contradictory results . ISD acts in PCOS by lowering the moving insulin levels in the body. But, some contradictory facts as metformin be able to directly influence ovarian steroidogenesis ,. Numerous results have exhibited the advantages of metformin in PCOS patients together with restoring ovulation, reducing weight, circulating androgen levels, risk of miscarriage, and risk of gestational diabetes mellitus. Metformin in ovarian stimulation regime in in-vitro reproduction gives better pregnancy results.
Effect of metformin on cholesterol level
Metformin is the preferential treatment for diabetes because it appears to be the most efficient drug of all FDA-approved diabetes drugs for reducing unhealthy low-density lipoprotein cholesterol level .
Role of metformin on the prevention of heart disease
Metformin reduced the risk of coronary heart disease in individuals with metabolic syndrome or T-2 DM; some studies have reported that metformin reduces heart disease risk as regular exercise. It also established its efficacy in avoiding heart disease in people without metabolic syndrome .
Prevention of cancer and cancer recurrence
Various epidemiological studies have reported associations between metformin, used to treat T-2DM, and reduced cancer occurrence and mortality . Some studies reported that smokers with diabetes who takes metformin are less expected to produce lung cancer. Oral use of metformin reduced tumor incidence in mice by 40-50 percent, and injected metformin reduced tumor incidence by 72% .
Fights fat in the womb
Some morbidly obese pregnant women are taking metformin to avoid their babies from being born overweight. The drug safely reduced the quantity of food going to the unborn babies, although it will not assist the mother to lose weight. This type of barrier is vital because critically overweight pregnant women often produce obese babies, which can cause troubles during labor and delivery and life-long health for the child .
Metformin improving aging outcomes
Metformin also affect ageing other than glycemic control. Like inflammatory markers, interleukins and tumor necrosis factor can activate different cellular processes that lead to cellular and tissue damage. The interleukin-6 can persuade fibroblast proliferation and collagen formation, leading to cardiac remodeling. It can promote depressed contractility, myocyte hypertrophy and apoptosis . Metformin changes inflammatory responses via inhibition of nuclear factor-kB via AMP-activated protein kinase (AMPK)-dependent pathways . Metformin also reduces the formation of reactive oxygen species via reverse electron flux  and via the mechanistic target of rapamycin, leading to a drop in in superoxide, which may guide to DNA damage and mutations . High levels of ceramides in the skeletal muscle are concerned in the aging process. This decreases myoblast proliferation, aberrant cell-cycle regulation, and a senescent myoblast phenotype. Cell studies have exhibited that metformin can reserve the negative result of ceramides, thus potentially avoiding myoblast senescence . This may be helpful for the rising population of older adults with sarcopenic obesity, while possibly improving tissue fitness and functions.
Neuroprotective role of metformin
Some studies have exhibited that metformin exhibited neuroprotective actions, reducing neuronal damage and enhancing oxygen and glucose deficiency, ensuing in improved neuronal survival and avoiding etoposide-induced apoptosis in the key neurons , ([Table 1],[Table 2],[Table 3],[Table 4],[Table 5]).
|Table 2 Metformin improved nonalcoholic fatty liver disease ,,,,,|
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|Table 3 Beneficial effects of metformin on energy metabolism and white-adipose-tissue remodeling ,,|
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|Table 5 Cardiovascular protective effect of metformin ,,,,,,|
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| Conclusion|| |
Metformin is not completely free from side effects. Most often caused side effects are nausea, vomiting, and headache. Rarely, in few individuals, it causes an increase of lactic acid in the blood (lactic acidosis), a very severe side effect. Individuals with kidney problems are more vulnerable to lactic acidosis and should not take metformin. Hence, although there are a variety of assumed applications of metformin in an enormous spectrum of diseases, many mechanisms remain to be understood. More clinical data are needed before the beneficial application of metformin which can be wide-ranging to treat those diseases other than of diabetes .
Financial support and sponsorship
Conflicts of interest
There are no conflicts of interest.
| References|| |
Bailey CJ. Metformin: historical overview. Diabetologia 2017; 60:1566–1576.
Zhou J, Massey S, Story D, Li L. Metformin: an old drug with new applications. Int J Mol Sci 2018; 19:2863.
Salpeter SR, Buckley NS, Kahn JA, Salpeter EE. Meta-analysis: metformin treatment in persons at risk for diabetes mellitus. Am J Med 2008; 121:149–157.
Beysel S, Unsal IO, Kizilgul M, Caliskan M, Ucan B, Cakal E. The effects of metformin in type 1 diabetes mellitus. BMC Endocrine Disord 2018; 18:1.
Rena G, Hardie GD, Pearson ER. The mechanisms of action of metformin. Diabetologia 2017; 60:1577–1585.
Velazquez EM, Mendoza S, Hamer T, Sosa F, Glueck CJ. Metformin therapy in polycystic ovary syndrome reduces hyperinsulinemia, insulin resistance, hyperandrogenemia, and systolic blood pressure, while facilitating normal menses and pregnancy. Metabolism 1994; 43:647–654.
Diamanti-Kandarakis E, Dunaif A. New perspectives in polycystic ovary syndrome. Trend Endocrinol Metab 1996; 7:267–271.
Nieuwenhuis-Ruifrok AE, Kuchenbecker WK, Hoek A, Middleton P, Norman RJ. Insulin sensitizing drugs for weight loss in women of reproductive age who are overweight or obese: systematic review and meta-analysis. Hum Reprod Update 2009; 15:57–68.
Mansfield R, Galea R, Brincat M, Hole D, Mason H. Metformin has direct effects on human ovarian steroidogenesis. Fertil Steril 2003; 79:956–962.
Arlt W, Auchus RJ, Miller WL. Thiazolidinediones but not metformin directly inhibit the steroidogenic enzymes P450c17 and 3 beta-hydroxysteroid dehydrogenase. J Biol Chem 2001; 276:16767–16771.
Pentikäinen PJ, Voutilainen E, Aro A, Uusitupa M, Penttilä I, Vapaatalo H. Cholesterol lowering effect of metformin in combined hyperlipidemia: placebo controlled double blind trial. Ann Med 1990; 22:307–312.
Griffin SJ, Leaver JK, Irving GJ. Impact of metformin on cardiovascular disease: a meta-analysis of randomised trials among people with type 2 diabetes. Diabetologia 2017; 60:1620–1629.
Sakoda LC, Ferrara A, Achacoso NS, Peng T, Ehrlich SF, Quesenberry CP, Habel LA. Metformin use and lung cancer risk in patients with diabetes. Cancer Prev Res (Phila) 2015; 8:174–179.
Chiswick C, Reynolds RM, Denison F, Drake AJ, Forbes S, Newby DE et al.
Effect of metformin on maternal and fetal outcomes in obese pregnant women (EMPOWaR): a randomised, double-blind, placebo-controlled trial. Lancet Diabetes Endocrinol 2015; 3:778–786.
Valencia WM, Tamariz PAL, Florez H. Metformin and ageing: improving ageing outcomes beyond glycaemic control. Diabetologia 2017; 60:1630–1638.
Mancini SJ, White AD, Bijland S, Rutherford C, Graham D, Richter EA et al.
Activation of AMP-activated protein kinase rapidly suppresses multiple pro-inflammatory pathways in adipocytes including IL-1 receptor-associated kinase-4 phosphorylation. Mol Cell Endocrinol 2017; 440:44–56.
Batandier C, Guigas B, Detaille D, El-Mir MY, Fontaine E, Rigoulet M, Leverve XM. The ROS production induced by a reverse-electron flux at respiratory-chain complex 1 is hampered by metformin. J Bioenerg Biomembr 2006; 38:33–42.
Halicka HD, Zhao H, Li J, Traganos F, Studzinski GP, Darzynkiewicz Z. Attenuation of constitutive DNA damage signaling by 1, 25-dihydroxyvitamin D3. Aging 2012; 4:270–278.
Jadhav KS, Dungan CM, Williamson DL. Metformin limits ceramide-induced senescence in C2C12 myoblasts. Mech Ageing Dev 2013; 134:548–559.
Chung MM, Chen YL, Pei D, Cheng YC, Sun B, Nicol CJ et al.
The neuroprotective role of metformin in advanced glycation end product treated human neural stem cells is AMPK-dependent. Biochem Biophys Acta 2015; 1852:720–731.
El-Mir MY, Detaille D, R-Villanueva G, Delgado-Esteban M, Guigas B, Attia S et al.
Neuroprotective role of antidiabetic drug metformin against apoptotic cell death in primary cortical neurons. J Mol Neurosci, 2008; 34:77–87.
Snehalatha C, Priscilla S, Nanditha A, Arun R, Satheesh K, Ramachandran A. Metformin in Prevention of Type 2 Diabetes. J Assoc Phys India 2018; 66:55–58.
Viollet B, Guigas B, Sanz Garcia N, Leclerc J, Foretz M, Andreelli F. Cellular and molecular mechanisms of metformin: an overview. Clin Sci (Lond) 2012; 122:253–270.
Miller RA, Chu Q, Xie J, Foretz M, Viollet B, Birnbaum MJ. Biguanides suppress hepatic glucagon signalling by decreasing production of cyclic AMP. Nature 2013; 494:256–260.
Wu T, Thazhath SS, Bound MJ, Jones KL, Horowitz M, Rayner CK. Mechanism of increase in plasma intact GLP-1 by metformin in type 2 diabetes: stimulation of GLP-1 secretion or reduction in plasma DPP-4 activity?. Diabetes Res Clin Pract 2014; 106:e3–e6.
Lashen H. Role of metformin in the management of polycystic ovary syndrome. Ther Adv Endocrinol Metabol 2010; 1:117–128.
Xu T, Brandmaier S, Essias AC, Herder C, Draisma HHM, Demirkan A et al.
Effects of metformin on metabolite profiles and LDL cholesterol in patients with type 2 diabetes. Diabetes Care 2015; 38:1858–1867.
Hostalek U, Gwilt M, Hildemann S. Therapeutic use of metformin in prediabetes and diabetes prevention. Drugs 2015; 75:1071–1094.
Han G, Gong H, Wang Y, Guo S, Liu K. AMPK/mTOR-mediated inhibition of survivin partly contributes to metformin-induced apoptosis in human gastric cancer cell. Cancer Biol Ther 2015; 16:77–87.
Abd El Fattah EA. Can metformin limit weight gain in the obese with pregnancy?. Int J Reprod Contracept Obstet Gynecol 2016; 5:818–825.
Zhu X, Yan H, Xia M, Chang X, Xu X, Wang L et al.
Metformin attenuates triglyceride accumulation in HepG2 cells through decreasing stearyl-coenzyme A desaturase 1 expression. Lipids Health Dis. 2018; 17:114.
Lin MJ, Dai W, Scott MJ, Li R, Zhang YQ, Yang Y et al.
Metformin improves nonalcoholic fatty liver disease in obese mice via down-regulation of apolipoprotein A5 as part of the AMPK/LXR signaling pathway. Oncotarget 2017; 8:108802–108809.
Li R, Chen L, Zhao W, Zhao SP, Huang XS. Metformin ameliorates obesity-associated hypertriglyceridemia in mice partly through the apolipoprotein A5 pathway. Biochem Biophys Res Commun 2016; 478:1173–1178.
Woo SL, Xu H, Li H, Zhao Y, Hu X, Zhao J et al.
Metformin ameliorates hepatic steatosis and inflammation without altering adipose phenotype in diet-induced obesity. PLoS One 2014; 9:e91111.
Geerling JJ, Boon MR, van der Zon GC, van den Berg SA, van den Hoek AM, Lombès M et al.
Metformin lowers plasma triglycerides by promoting VLDL-triglyceride clearance by brown adipose tissue in mice. Diabetes 2014; 63:880–891.
Duseja A, Das A, Dhiman RK, Chawla YK, Thumburu KT, Bhadada S, Bhansali A. Metformin is effective in achieving biochemical response in patients with nonalcoholic fatty liver disease (NAFLD) not responding to lifestyle interventions. Ann Hepatol 2007; 6:222–226.
Tokubuchi I, Tajiri Y, Iwata S, Hara K, Wada N, Hashinaga T et al.
Beneficial effects of metformin on energy metabolism and visceral fat volume through a possible mechanism of fatty acid oxidation in human subjects and rats. PLoS One 2017; 12:e0171293.
Breining P, Jensen JB, Sundelin EI, Gormsen LC, Jakobsen S, Busk M et al.
Metformin targets brown adipose tissue in vivo and reduces oxygen consumption in vitro. Diabetes Obes Metab 2018; 20:2264–2273.
Luo T, Nocon A, Fry J, Sherban A, Rui X, Jiang B et al.
AMPK Activation by Metformin Suppresses Abnormal Extracellular Matrix Remodeling in Adipose Tissue and Ameliorates Insulin Resistance in Obesity. Diabetes 2016; 65:2295–2310.
Qi T, Chen Y, Li H, Pei Y, Woo SL, Guo X et al.
A role for FKFB3/iPFK2 in metformin suppression of adipocyte inflammatory responses. J Mol Endocrinol 2017; 59:49–59.
Jing Y, Wu F, Li D, Yang L, Li Q, Li R. Metformin improves obesity-associated inflammation by altering macrophages polarization. Mol Cell Endocrinol 2018; 461:256–264.
Calvert JW, Gundewar S, Jha S, Greer JJ, Bestermann WH, Tian R, Lefer DJ. Acute metformin therapy confers cardioprotection against myocardial infarction via AMPK-eNOS-mediated signaling. Diabetes 2008; 57:696–705.
Yin M, van der Horst IC, van Melle JP, Qian C, van Gilst WH, Silljé HH, de Boer RA. Metformin improves cardiac function in a nondiabetic rat model of post-MI heart failure. Am J Physiol Heart Circ Physiol 2011; 301:H459–H468.
Chen Q, Thompson J, Hu Y, Das A, Lesnefsky EJ. Metformin attenuates ER stress induced mitochondrial dysfunction. Transl Res 2017; 190:40–50.
Bridges HR, Jones AJ, Pollak MN, Hirst J. Effects of metformin and other biguanides on oxidative phosphorylation in mitochondria. Biochem J 2014; 462:475–487.
Yang Q, Yuan H, Chen M, Qu J, Wang H, Yu B et al.
Metformin ameliorates the progression of atherosclerosis via suppressing macrophage infiltration and inflammatory responses in rabbits. Life Sci 2018; 198:56–64.
Li X, Kover KL, Heruth DP, Watkins DJ, Moore WV, Jackson K et al.
New Insight Into Metformin Action: Regulation of ChREBP and FOXO1 Activities in Endothelial Cells. Mol Endocrinol 2015; 29:1184–1194.
[Table 1], [Table 2], [Table 3], [Table 4], [Table 5]