Pathophysiology of Circulating Biomarkers and Relationship With Vascular Aging: A Review of the Literature From VascAgeNet Group on Circulating Biomarkers, European Cooperation in Science and Technology Action 18216.

Impairment of the arteries is a product of sustained exposure to various deleterious factors and progresses with time; a phenomenon inherent to vascular aging. Oxidative stress, inflammation, the accumulation of harmful agents in high cardiovascular risk conditions, changes to the extracellular matrix, and/or alterations of the epigenetic modification of molecules, are all vital pathophysiological processes proven to contribute to vascular aging, and also lead to changes in levels of associated circulating molecules. Many of these molecules are consequently recognized as markers of vascular impairment and accelerated vascular aging in clinical and research settings, however, for these molecules to be classified as biomarkers of vascular aging, further criteria must be met. In this paper, we conducted a scoping literature review identifying thirty of the most important, and eight less important, biomarkers of vascular aging. Herein, we overview a selection of the most important molecules connected with the above-mentioned pathological conditions and study their usefulness as circulating biomarkers of vascular aging.

A 12-week exercise program improves functional status in postmenopausal osteoporotic women: randomized controlled study.

BACKGROUND: Beside the importance of implementing physical activity in treatment of patients with osteoporosis, the multicomponent exercise program and assessment of its functional outcomes performed by five performance-based measures, have not been explored yet. AIM: The present study evaluated the effect of the 12 weeks exercise program on functional outcomes of postmenopausal patients with densitometric diagnosed osteoporosis. DESIGN: The study was designed as randomized control study. SETTING: Female outpatients with diagnosed postmenopausal osteoporosis were included in the study. POPULATION: The study included women from urban area. METHODS: Patients were randomized in two groups: exercise group (EG) and control group (CG). Patients in the exercise group (N.=47) participated in a 12 weeks exercise program, which consisted of resistance training, balance exercise and aerobic exercise, while patients from control group (N.=49) had not participated in any exercise program during the intervention period. Functional outcomes determined by Time Up and Go Test (TUG), Sit To Stand test (STS) and One Leg Stance Test (OLST) were evaluated at baseline and 4 and 12 weeks after treatment, while Fall Efficacy Scale (FES-I) and Knowledge About Osteoporosis Questionnaire (OKAT-S) were assessed at baseline and after 12 weeks, respectively. RESULTS: There were noticed statistically significant improvement in all observed measurements in EG after 4 and 12 weeks, respectively. Comparison between groups showed statistically significant difference in EG compared to CG in all functional outcomes in observed periods (P<0.001 for all). OLST significantly changed only in EG, not in CG, in both experimental periods. After 4 weeks, in CG there were no statistically significant changes in any of the monitored parameters, while after 12 weeks improvements were detected with TUG, STS, FES-I and OKAT-S. CONCLUSIONS: Twelve weeks exercise program, as an effective, inexpensive and easily performed method, improved functional status in postmenopausal osteoporotic women. CLINICAL REHABILITATION IMPACT: In the present study we found that supervised exercise program in postmenopausal osteoporotic female patients significantly improved their muscle strength and balance and decreased fear of falling. Thus, it is proposed to be a part of clinical protocol for osteoporosis treatment.

Papillary Thyroid Carcinoma: A Malignant Tumor with Increased Antioxidant Defense Capacity.

Papillary thyroid carcinoma (PTC) is the commonest thyroid malignancy worldwide for which the radiation exposure is the most influential risk factor. The levels of oxidative stress in PTC are not well characterized on the tissue level. The objective of this study was to evaluate total oxidant status (TOS) and total antioxidant status (TAS) in PTC and benign goiter (BG) tissues and to examine their association with clinicopathological characteristics. Tumor and normal thyroid tissue samples were collected from 59 PTC patients, and goiter tissues were collected from 50 BG patients. TOS and TAS were quantified in the tissue homogenates by spectrophotometric assays. TOS values in tumor tissues did not differ significantly from normal and goiter tissues; however, PTC tissues have significantly higher TAS values than normal and goiter tissues. TOS values correlated with retrosternal growth in BG patients. The significant correlations were found between TOS and TAS values and thyroid function parameters. In 17 PTC patients with multiple tumor foci (multicentric phenotype), TAS values were significantly lower, compared to 42 patients with unicentric PTC. TAS and TOS are the most useful predictors of thyroid capsular invasion by PTC. The age, sex, body mass index, smoking, familial history of thyroid disease and nodule size did not influence TOS and TAS in PTC or BG patients. In conclusion, we show the profiles of TOS and TAS in PTC and BG tissues. Importantly, PTC tissues possess increased antioxidant capacity. The redox status influences the parameters of the thyroid function and tumor's biological behavior.

Activity of superoxide dismutase, catalase, glutathione peroxidase, and glutathione reductase in different stages of colorectal carcinoma.

BACKGROUND: Reactive oxygen species are involved in the pathogenesis of colorectal carcinoma. Clarification of oxidative/antioxidant specificities of different stages of colorectal carcinoma is of special importance. AIM: To determine oxidative/antioxidant status in plasma of patients with different stages of colorectal carcinoma using malondialdehyde concentration, superoxide dismutase, catalase, glutathione peroxidase, and glutathione reductase activities and distribution of superoxide dismutase isoforms. METHODS: Lipid peroxidation and antioxidant enzymes activity were estimated using spectrophotometric methods. Reverse zymography was applied for characterization of superoxide dismutase isoforms. RESULTS: Lipid peroxidation is increased in all groups compared to the control, but without differences between different stages of colorectal carcinoma. Total superoxide dismutase activity is lower in all colorectal carcinoma groups than in control, and there is a significant increase in tumor stage IV when compared with tumor stage II. Manganese superoxide dismutase isoform is dominant in all groups and its relative activities are significantly higher than activities of a copper/zinc isoform. Total peroxidase potential reflected in catalase and glutathione peroxidase activity is increased when compared to the control, but without any significant differences between colorectal carcinoma groups. Glutathione reductase activity is lower in all colorectal carcinoma groups than in control, and a significant decrease in glutathione reductase activity was obtained between patients in tumor stage II and III compared to tumor stage IV. CONCLUSIONS: Colorectal carcinoma is characterized by increased oxidative stress and antioxidant disbalance. Progression of disease is followed by an increase in redox disbalance.

Enzymatic characterization of 30 kDa lipase from Pseudomonas aeruginosa ATCC 27853.

An extracellular lipase from Pseudomonas aeruginosa ATCC 27853 has been purified and its enzymatic characteristics were determined. According to SDS-PAGE and gel filtration molecular mass estimated to be 30 kDa, what classified the lipase in group I.1. Although 14 lipases from P. aeruginosa with similar molecular mass are referred to date, their basic enzymatic properties have not been reported yet. To address the gap we found: the optimal temperature and pH in water solution being 50 degrees C and 9.3, respectively; the lipase was inhibited with Hg2+ ions and sodium dodecylsulphate (SDS), while non-ionic detergent Triton X-100 activated the enzyme; the lipase hydrolyzed more rapidly middle chain triglycerides and it was not regiospecific; the lipase demonstrated naturally occurring stability in different organic solvents with concentrations ranging from 30 to 70%, including good thermal stability in 30% organic solvent solution. Even though strain P. aeruginosa ATCC 27853 was not isolated from extreme environment it showed activity in organic solvent suggesting that this lipase is suitable for variety of applications, including reactions in water restricted medium and bioremediation of contaminations by organic solvents.

The influence of Al3+ ion on porcine pepsin activity in vitro.

The in vitro effect of Al(3+) ions in the concentration range 1.7 x 10(-6) M-8.7 x 10(-3) M on pepsin activity at pH 2, via kinetic parameters and its electrophoretic mobility was evaluated. Kinetic study demonstrated the existence of an activation effect of Al(3+) at pH 2 on pepsin molecule. Kinetic analysis with respect to concentrations of haemoglobin showed that Al(3+) ions increase the maximal velocity (V(max)) and k(cat) values rather than apparent affinity for substrate (K(S)) implying the non-competitive nature of activation which indicated that aluminium was a non-essential activator of partial non-competitive type. The values of the equilibrium constants K(S) and K(mA) for dissociation of corresponding complexes were evaluated as 0.904 +/- 0.083 mM and 8.56 +/- 0.51 microM, respectively. Dissociation constant K(A), of activator from enzyme-activator complex calculated via kinetic and direct measurement of Al(3+) binding data, as well as activation constant A(50), the activator concentration that gives a rate equal to half at a saturating concentration of activator, were found to be 8.82 +/- 0.90 microM, 8.39 +/- 0.76 microM, and 8.05 +/- 0.48 microM respectively. Native PAGE electrophoresis shows the decrease in electrophoretic mobility of pepsin and confirms modification of the electric charge and conformational changes of pepsin caused by bound Al(3+) on the pepsin molecule. Al(3+) induced conformational changes of pepsin were verified by UV-VIS and IR spectra. Moreover, the absence of conformational changes in the haemoglobin molecule in the presence of Al(3+) ions confirms that the obtained activation is a consequence of conformational changes caused only in the pepsin molecule.