Matrix Metalloproteinases in Asthma-Associated Airway Remodeling – Dr. Jekyll or Mr. Hyde ?

Matrix metalloproteinases (MMPs) are Zn2+-dependent endoproteases, which digest extracellular matrix (ECM) components and various non-ECM molecules. Main physiological role of MMPs concerns regulation of tissue remodeling and regeneration. The production and activity of MMPs are tightly supervised by multistage control mechanisms. These mechanisms include regulation of gene expression, and various post-transcriptional/post-translational modifications. However, without proper control MMPs reveal dual nature, similarly to character from the novella by R.L. Stevenson, “Strange Case of Dr Jekyll and Mr Hyde”. They become dangerous molecules, involved in cancer metastasis, or cardiovascular diseases

Longitudinal Evaluation of Biomarkers in Wound Fluids from Venous Leg Ulcers and Split-thickness Skin Graft Donor Site Wounds Treated with a Protease-modulating Wound Dressing

Venous leg ulcers represent a clinical challenge and impair the quality of life of patients. This study examines impaired wound healing in venous leg ulcers at the molecular level. Protein expression patterns for biomarkers were analysed in venous leg ulcer wound fluids from 57 patients treated with a protease-modulating polyacrylate wound dressing for 12 weeks, and compared with exudates from 10 acute split-thickness wounds. Wound healing improved in the venous leg ulcer wounds: 61.4% of the 57 patients with venous leg ulcer achieved a relative wound area reduction of ≥ 40%, and 50.9% of the total 57 patients achieved a relative wound area reduction of ≥ 60%. Within the first 14 days, abundances of S100A8, S100A9, neutrophil elastase, matrix metalloproteinase-2, and fibronectin in venous leg ulcer exudates decreased significantly and remained stable, yet higher than in acute wounds. Interleukin-1β, tumour necrosis factor alpha, and matrix metalloproteinase-9 abundance ranges were similar in venous leg ulcers and acute wound fluids. Collagen (I) α1 abundance was higher in venous leg ulcer wound fluids and was not significantly regulated. Overall, significant biomarker changes occurred in the first 14 days before a clinically robust healing response in the venous leg ulcer cohort

Security theory and practice: The Total Defence 21st century.COM – building a resilient society

Introduction: "When we started working on the issue entitled “The Total Defence 21st century. COM – building a resilient society”, we did not know then how topical this issue would become. We were aware of its importance, especially since 2014, which was the beginning of the Russian aggression against Ukraine. However, we did not think that the need to build an effective concept of total/comprehensive defence, and then its implementation, would become so pressing in February 2022. Two of the three general regularities in the history of international relations have also become extremely topical. We are talking about the clash between imperial and polyarchic tendencies, and nations’ desire to express their independence and identity, and as a result, to have their own state. It can be assumed that in order to achieve this goal, as well as for small and medium-sized states to be able to defend themselves against the forces of empires and effectively deter them, they must use the concept of total/comprehensive defence, in its improved, 21st century version."(...