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Hyperlipidemia starts at a pediatric age and represents an unquestionable risk factor for cardiovascular disease. Modulation of the intestinal microbial ecosystem (IME), in principle, can ameliorate lipid profiles. In this study, we characterized the IME of children and adolescents with primary hyperlipidemia by analyzing fecal samples through 16S rRNA gene profiling (n = 15) and short chain fatty acid (SCFA) quantification (n = 32). The same analyses were also carried out on age-matched normolipidemic controls (n = 15). Moreover, we evaluated the modulatory effect of regular hazelnut intake (approximately 0.43 g of hazelnuts with skin per kg of body weight) on the IME of 15 children and adolescents with hyperlipidemia for eight weeks. We found alterations of numerous operational taxonomic units potentially associated with SCFA-producing bacteria and reductions in the fecal levels of acetate, butyrate and propionate in hyperlipidemic subjects. Furthermore, we observed that an eight-week hazelnut intervention may induce limited changes in fecal microbiota composition but can significantly modulate the fecal levels of predominant intestinal SCFAs, such as acetate. Finally, correlation analyses indicated that changes in lipidemic parameters are linked to modifications of the abundance of specific bacterial taxa, such as the families Lachnospiraceae and Ruminococcaceae and the genera Akkermansia, Bacteroides, Roseburia, and Faecalibacterium. This study suggests that children and adolescents with primary hyperlipidemia possess an altered IME. The promising results presented here support the need for future dietary interventions aimed at positively modulating the IME of hyperlipidemic subjects.

fems microbiology ecology/fems microbiology, ecology

Evidence of dysbiosis in the intestinal microbial ecosystem of children and adolescents with primary hyperlipidemia and the potential role of regular hazelnut intake