Rabbit anti-Human HPR polyclonal antibody

Background. High on-aspirin treatment platelets reactivity (HPR) is a significant problem in long-term secondary prevention of cardiovascular events. We hypothesize that imbalance between platelets MMPs/TIMPs results in cardiovascular disorders. We also explored whether chronically elevated blood glucose affects MMP-2/TIMP-4 release from platelets. Materials and Methods. Seventy patients with stable coronary artery disease, supplemented with aspirin, participated in this pilot study. The presence of HPRand/or diabetesmellitus was considered as the differentiating factor. Light aggregometry, impedance aggregometry, and ELISA tests for TXB2, MMP-2, MMP-9, and TIMP-4 were performed in serum, plasma, platelet-rich plasma, and platelets-poor plasma, as appropriate. Results. Aspirin-HPR did not affect plasma MMP-2, MMP-9, and TIMP-4. Arachidonic acid-induced aggregation of platelets from aspirin-HPR patients did not lead to increased release of MMP-2, MMP-9, and TIMP-4. Studying patients at the lowest TXB2 serum concentration quartile revealed that high concentration of plasma TIMP-4 and TIMP-4 negatively correlated with TXB2 and platelet aggregation. Diabetics showed an increased plasma MMP-2 as well as an increased MMP-2 in supernatants after platelet aggregation. However, diabetes mellitus did not affect MMP-9 and TIMP-4. Conclusion. Aspirin-HPR did not affect the translocation and release of MMPs and TIMP-4 from platelets. TIMP-4 may serve as a marker of TXA2-mediated platelet aggregation. Chronically elevated plasma glucose increases plasma MMP-2, and HPR potentiates this phenomenon.

The graphene-derived solids such as doped graphene, graphene oxide (GO), and reduced graphene oxide (rGO) have been identified as supports for preparation of catalysts for various catalytic applications. Among those, hydro processing (HPR) of model compounds as well as feeds from conventional and nonconventional sources has also been evaluated. It was evident that HPR catalysts supported on graphene supports out-performed catalysts supported on other carbon solids. The stability of the former catalysts in the presence of water is of particular importance for the HPR of nonconventional feeds. Graphene solids as supports may play an important role during the development of HPR catalysts not requiring presulfiding. The activity of graphene alone was enhanced either by doping with various dopants or by functionalization. Once active metals were anchored on the surface, the activity of graphene-supported catalysts was increased significantly. Conventional metals such as Mo, Ni, Co, and Fe as well as noble metals such as Pt, Pd, Ru, and Rh have been evaluated as active metals.