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Introduction The regulatory role of microRNA (miRNA) in several conditions has been studied, but their function in tendon healing remains elusive. This review summarizes how miRNAs are related to the pathogenesis of tendon injuries and highlights their clinical potential, focusing on the issues related to their delivery for clinical purposes. Sources of data We searched multiple databases to perform a systematic review on miRNA in relation to tendon injuries. We included in the present work a total of 15 articles. Areas of agreement The mechanism of repair of tendon injuries is probably mediated by resident tenocytes. These maintain a fine equilibrium between anabolic and catabolic events of the extracellular matrix. Specific miRNAs regulate cytokine expression and orchestrate proliferation and differentiation of stromal cell lines involved in the composition of the extracellular matrix. Areas of controversy The lack of effective delivery systems poses serious obstacles to the clinical translation of these basic science findings. Growing point In vivo studies should be planned to better explore the relationship between miRNA and tendon injuries and evaluate the most suitable delivery system for these molecules. Areas timely for developing research Investigations ex vivo suggest therapeutic opportunities of miRNA for the management of tendon injuries. Given the poor pharmacokinetic properties of miRNAs, these must be delivered by an adequate adjuvant transport system.

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Supercritical antisolvent precipitation (SAS) is based on the fast dissolution of a liquid solution in a supercritical fluid. This technique has been tested to produce nanoparticles of yttrium, samarium, and neodymium acetates to be used as precursors of high-temperature superconductors. Particles of various morphologies were produced at different expansion levels of the liquid solution. Nanoparticles down to about 100 nm were obtained at very large expansion levels, whereas very large aggregates (balloons) with the diameter of several microns were produced at intermediate expansion levels. The influence of several process parameters on particle diameter and particle size distribution was studied. Among SAS process parameters, pressure, temperature, concentration of the liquid solution, and different liquid solvents were tested.

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