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We read with interest the commentary by Hoff mann and colleagues [1] on our manuscript recently published in Critical Care showing that matrix metalloproteinase (MMP)-9, MMP-10 and tissue inhibitor of matrix metalloproteinases (TIMP)-1 could be new biomarkers of severity and mortality in sepsis [2]. As they stated, the lack of serial measurements of MMPs and TIMPs over clinical evolution was as a limitation of our study. Despite this limitation, our results suggest that MMPs and TIMPs may be of pathophysiological signifi cance in sepsis. Some clinical studies have found higher circulating levels of MMP-9 [2-4] and TIMP-1 [2,3] in septic patients than in healthy controls, and higher levels of TIMP-1 [2,3] or MMP-9 [4] in nonsurviving than in surviving septic patients. Our study also reports, for the fi rst time, that MMP-10 circulating levels are also elevated in septic patients [2]. According to the results of some in vitro studies, MMP-10 could play a role in infection, since increased MMP-10 gene transcription was observed after infective stimulation of human and mice cells. On the other hand, we think the correlation between MMP-9, TIMP-1 and markers of coagulopathy, and the lower MMP-9/TIMP-1 ratio in nonsurviving than in surviv ing septic patients found in our study, may be associated with a higher prothrombotic/antifi brinolytic state, responsible for the capillary thrombosis, multiple organ dysfunction, and death. Finally, from a therapeutic perspective, the development of modulators of MMP/TIMP activity could be used as a new class of drugs for the treatment of severe sepsis [5].

Matrix metalloproteinases and their inhibitors as biomarkers of severity in sepsis