MMP9 and diabetic foot: It has been pointed out that wound fluid MMP-9 levels from patients with diabetic foot ulcers were remarkably higher than in control subjects. This study brings to light the potential therapeutic effect that microRNAs controlling and downregulating MMP-9 levels can have in curing diabetic wounds. Similarly, studies by Gao et al. [18] and Li et al. [19] have revealed that the inhibition of MMP-9 expression encourages the healing of chronic wounds.