Potential Protective Effect of Oleanolic Acid on the Components of Metabolic Syndrome: A Systematic Review

Ángel Fernández-Aparicio, Jacqueline Schmidt-RioValle, Javier S Perona, María Correa-Rodríguez, Jose M Castellano, Emilio González-Jiménez, Ángel Fernández-Aparicio, Jacqueline Schmidt-RioValle, Javier S Perona, María Correa-Rodríguez, Jose M Castellano, Emilio González-Jiménez

Abstract

The high prevalence of obesity is a serious public health problem in today's world. Both obesity and insulin resistance favor the development of metabolic syndrome (MetS), which is associated with a number of pathologies, especially type 2 diabetes mellitus, and cardiovascular diseases. This serious problem highlights the need to search for new natural compounds to be employed in therapeutic and preventive strategies, such as oleanolic acid (OA). This research aimed to systematically review the effects of OA on the main components of MetS as well as oxidative stress in clinical trials and experimental animal studies. Databases searched included PubMed, Medline, Web of Science, Scopus, EMBASE, Cochrane, and CINAHL from 2013 to 2019. Thus, both animal studies (n = 23) and human clinical trials (n = 1) were included in our review to assess the effects of OA formulations on parameters concerning insulin resistance and the MetS components. The methodological quality assessment was performed through using the SYRCLE's Risk of Bias for animal studies and the Jadad scale. According to the studies in our review, OA improves blood pressure levels, hypertriglyceridemia, hyperglycemia, oxidative stress, and insulin resistance. Although there is scientific evidence that OA has beneficial effects in the prevention and treatment of MetS and insulin resistance, more experimental studies and randomized clinical trials are needed to guarantee its effectiveness.

Keywords: hypertension; inflammation; insulin resistance; metabolic syndrome; obesity; triterpenes.

Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
Flow diagram according to the PRISMA Checklist. Selection of studies. OA: oleanolic acid; IR: Insulin resistance; MetS: Metabolic syndrome.

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