Rabbit Anti-Human MMP1 (Cleaved-Ile271) Polyclonal antibody

Background and objectives: Matrix metalloproteinases (MMPs) are involved in several inflammatory processes including obesity-related vascular diseases and graft failure of coronary artery (CA) bypass grafts [internal mammary artery (IMA), saphenous vein (SV)]. In these inflammatory conditions, the release of prostaglandin E-2 (PGE(2)) is increased via the activity of inducible microsomal PGE synthase-1 (mPGES-1). Our aim was to investigate whether MMPs and their endogenous inhibitor (TIMPs) may be regulated by PGE(2) under inflammatory conditions in human vasculature and perivascular adipose tissue (PVAT), as well as in plasma of obese patients. Methods: MMP-1,-2 and TIMP-1,-2 densities were measured in human plasma (n = 68) as well as in supernatants of human vascular wall (IMA n = 16, SV n = 14, CA n = 13) and their PVAT. The effects of inflammation and mPGES-1 inhibitor (Compound III, 10 mu M) on MMPs regulation were evaluated. The correlations between PGE(2) and several parameters were calculated in plasma from patients with or without obesity. Results: The vascular wall and PVAT from SV exhibited the greatest MMP-1,-2 release. An increase of MMP-1,-2 and/or a decrease of TIMP-1 quantities have been detected under inflammation only in vascular wall not in PVAT. These changes under inflammation were completely reversed by inhibition of mPGES-1. In obesity, C-reactive protein (CRP), biomarker of inflammation, and PGE(2) levels were increased. PGE(2) contents were positively correlated with some anthropometric parameters and plasmatic CRP in both genders, while the correlation with the plasmatic MMP-1 density was significant only in women. Conclusions: The greater MMP activity observed in SV may contribute to the increased prevalence of graft failure. Under inflammation, the greater mPGES-1 and PGE(2) levels lead to enhanced MMP activity in human vascular walls. The positive association between PGE(2) and MMP-1 or CRP has been observed in plasma of women. We suggest that mPGES-1 inhibitors could prevent graft failure and obesity-related vascular remodeling mostly in women.

Local unwinding of the collagen triple helix is a necessary step for initiating the collagen degradation cascade in extracellular matrices. A few matrix metalloproteinases (MMPs) are known to support this key process, but its energetic aspects remain unknown. Here, we captured the thermodynamics of the triple helix unwinding by monitoring interactions between a collagen peptide and MMP-1(E200A) - an active-site mutant of an archetypal vertebrate collagenase - at increasing temperatures, using isothermal titration calorimetry (ITC). Coupled binding and unwinding manifests as a curved relationship between the total enthalpy change and temperature of the reaction, producing increasingly negative heat capacity change (Delta Delta C-p approximate to -36.3 kcal/molK(2)). A specially d(e)signed solid-phase binding and cleavage assay (SPBCA) reported strain in the catalytically relevant unwound state, suggesting that this state is distinct from the horizon of sampled conformations of the collagenase-susceptible site. MMP-1 appears to blend selected fit with induced fit mechanisms to catalyse collagen unwinding prior to cleavage of individual collagen chains. (C) 2020 Elsevier Ltd. All rights reserved.