Obesity-related inflammatory modulation by juçara berry (Euterpe edulis Mart.) supplementation in Brazilian adults: a double-blind randomized controlled trial
Obesity is an inflammatory-related disease, which recruits immune system cells triggering to imbalanced production of cytokines. Obesity management and treatment using foods bioactive compounds have gained clinical and scientific relevance. Juçara (Euterpe edulis Mart.) fruit is rich in fibers, unsaturated lipids and, anthocyanins showing potential health benefits. Thus, we investigated the effect of juçara pulp intake on inflammatory status of monocytes from obese individuals.
It is a placebo-controlled, randomized double-blind trial. Twenty-seven obese participants (BMI between 30.0 and 39.9 kg/m2) of both genders from 31 to 59-year-old, divided into two groups: 5 g juçara freeze-dried pulp or 5 g of placebo for 6 weeks. Before and after supplementation, blood samples were collected and monocytes obtained and stimulated with lipopolysaccharides. After 24 h of incubation, the cells and supernatants were analyzed.
Post-treatment, juçara reduced TLR4, and IL-6 mRNA compared to placebo. Juçara also increased IL-10 mRNA in post-treatment. The protein expression of TLR4 pathway post-treatment, MYD88 expression reduced in juçara group compared to placebo. The juçara post-treatment reduced pIKKα/β compared to the placebo. Ob-R protein levels were higher in the juçara group post-treatment compared to pre-treatment. IL-6, TNF-α, and MCP-1 production by monocytes were reduced by juçara in post-treatment compared to pre-treatment levels. The supplementation increased IL-10 in juçara group with LPS compared to pre-treatment and versus juçara group without LPS.
These results demonstrated a proinflammatory state at the beginning, which was improved by juçara pulp consumption. Our results suggest juçara pulp as a potential tool against the proinflammatory status of obesity.
KeywordsObesity Monocytes Inflammation Juçara TLR4 pathway
The authors acknowledge to Dylbert Fragoso Silvestre for technical assistance on the English language. Part of these results was previously presented as a conference abstract, in the 25th European Congress on Obesity by the authors.
LPP, LMO and VVR designed the study protocol; ABS, LVM, HCC, and GJ conducted experiments and analyzed data. LPP and ABS critically revised the article for important intellectual content; LPP and ABS contributed to writing the manuscript.
Supported by Fundação de Amparo à Pesquisa do Estado de São Paulo, (2016/14133-0; 2015/13875-0). LPP, LMO, VVR and JRV are recipients of CNPq (Conselho Nacional de Desenvolvimento Científico e Tecnológico) fellowship.
Compliance with ethical standards
Conflict of interest
The authors declare no conflict of interest.
The study procedures were in accordance with the guidelines set in the International Declaration of Helsinki and approved by the Ethics Committee of the Universidade Federal de São Paulo (CEP-UNIFESP No. 0319/2017) and registered in Plataforma Brasil database. The written informed consent was obtained from all volunteers.
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