Nuts-enriched diets were shown to bear beneficial effects for human's health. Among nuts, hazelnut plays a major role in human nutrition and health because of its unique fatty acid composition (predominantly MUFA), fat soluble bioactives (tocopherols and phytosterols), vitamins (vitamin E), essential minerals (selenium), essential amino acids, antioxidant phenolics (caffeic acid), dietary fiber (soluble form), and bioactive phtytochemicals. The current study was designed to explore the cellular effects of two particular hazelnut strains (Ordu and Tonda).Four hazelnut oils were obtained from 2 common strains (Ordu hazelnut oil, Ordu cuticle oil, Tonda "gentile" hazelnut oil, Tonda "gentile" cuticle oil). The metabolic and nutritional effects of the four hazelnut oils were assessed using an in vitro model of mouse myoblasts, identifying the intracellular mechanisms involved in muscle differentiation and in the modulation of specific muscle genes.We demonstrated that hazelnut oils induced morphological changes in neo-formed myotubes increasing myotubes size. In particular, the diversified effects of the hazelnuts and cuticle oils on muscle fibres shape (on length and diameter respectively) determine a diversified pattern of action on elongation or hypertrophy of the muscle fibres. Furthermore, hazelnut oils regulate different pathways associated with myoblasts growth and development, stimulate signal transduction, and activate cell commitment and differentiation. The present results provide evidence that hazelnut oils may affect skeletal muscle growth and differentiation, constituting the proof of principle for the future development of novel foods and integrators.
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