Ginkgo biloba extract (GbE) restores gut microbiota dysbiosis in a rat model of lard-rich diet-induced obesity

Abstract

Background: Gut microbiota (GM) modulation has been considered a nutritional approach to manage obesity. Reduced Firmicutes/Bacteroidetes ratio (F/B) is associated with reduced energy harvesting capacity from the diet, ameliorates endotoxemia and inflammation, and restores gut hormone signaling related to hypothalamic control of energy homeostasis. As anti-obesogenic and anti-inflammatory properties have been attributed to Ginkgo biloba extract (GbE), the present study investigated whether GbE supplementation for two weeks modulates the GM composition of obese rats. Method: Fifty-six 2-month-old male Wistar rats were submitted to a lard-rich diet-induced obesity protocol for 60 days (high-fat diet, HFD). Following the obesity-inducing period, rats were gavaged daily with GbE at 500 mg/kg (HFD+G group), or saline (HFD group), for 14 days. A 3rd group (pair-fed group, PF) was performed by mimicking the HFD group (saline administration) but with its food intake matched to the HFD+G group. Rats were euthanized on the 14th supplementation day. Stool DNA was extracted and amplified with V3–V4 region primers of the 16S rRNA gene. Results: In comparison to both HFD and PF groups, GbE supplementation increased the number of Bacteroidetes colon community and concomitantly reduced the abundance of Firmicutes, reducing the F/B ratio. Hierarchical clustering showed that communities of the HFD+G group were less likely related to HFD and PF groups. Conclusion: As GbE modulated the GM structure and diversity in GbE-supplemented obese rats, our results show that GbE possesses phytotherapeutic potential to modulate obesity by improving GM and lessening the consequences of obesity-related GM dysbiosis.

Keywords

• Obesity
• Dysbiosis
• High-fat diet
• Phytotherapy
• Metagenomics