Evaluation the tissue inhibitor of matrix metalloproteinases first type concentration in various platelet-related products

Purpose: to evaluate the content of tissue inhibitor of matrix metalloproteinase type 1 (TIMP-1) in platelet preparations obtained in different methods. Material and methods. Platelet-rich plasma (PRP), platelet-poor plasma, and a suspension of platelets washed from plasma (WP) were isolated from the blood of 10 volunteer donors, and a morphofunctional analysis of platelets was performed. After that, a platelet lysate was prepared from PRP, WP, and platelet-poor plasma. The concentration of TIMP-1 in the lysates was determined using enzyme immunoassay. Results. The level of TIMP-1 in the lysates of PRP and WP did not differ significantly; in platelet-poor plasma, the level of TIMP-1 was significantly lower than in the lysates of PRP and WP (p = 0.003). In all types of preparations, the concentration of TIMP-1 was 2-4 times higher than similar values in the blood serum of healthy people, as reported in other studies. A weak correlation was found between the TIMP-1 concentration and the platelet number in PRP, and there was no correlation between the content of platelets with granules and the TIMP-1 level in the lysates. The presence of leukocytes in the initial PRP also did not affect the TIMP level in the final lysates. A strong correlation was found between the TIMP-1 concentration in the WP lysate and in platelet-poor plasma, as well as a direct correlation between the total platelet content and the TIMP-1 level in the PRP lysate. Conclusions. Preparations with high concentrations of TIMP-1 can be obtained both from concentrated platelet suspensions and from platelet-poor plasma. To optimize the method, it is necessary to study the effect of platelet preparations with TIMP on various biological models.