Inês Aires

BACKGROUND: Decreased vitamin D serum levels have been recently related to arterial stiffening and vascular calcifications in haemodialysis (HD) patients, but the pathophysiology of this association is not yet clear. The aim of this study was to evaluate the relationship between vascular calcifications, cardiovascular risk factors [including brain natriuretic peptide (BNP), pulse pressure (PP) and left ventricular mass index] and 25-hydroxyvitamin D3 (25(OH)D3) and 1,25-dihydroxyvitamin D3 [1,25(OH)(2)D3] serum levels. METHODS: We performed a cross-sectional study with 223 prevalent HD patients, 48% females, 27% diabetics, with the mean age of 62.7 +/- 15.3 years and the mean HD time of 42.9 +/- 39.3 months. Forty-seven percent of the patients were taking active forms of vitamin D. RESULTS: Serum levels of [25(OH)D3] were low (21.6 +/- 12.2 ng/mL) and negatively correlated with age (r = -0.31, P < 0.001), diabetes mellitus (DM) (r = -0.20, P = 0.004), C-reactive protein (r = -0.25, P < 0.001), log(10) BNP (r = -0.22, P = 0.002), PP > 65 mmHg (r = -0.21, P = 0.003) and vascular calcifications (r = -0.26, P < 0.001). Levels of [25(OH)D3] were positively correlated with [1,25(OH)(2)D3] (r = 0.25, P < 0.001) and albumin (r = 0.23, P = 0.001). On multivariate analysis, levels of [25(OH)D3] were independently associated with DM (P < 0.001), lower albumin levels (P = 0.003), higher BNP values (P = 0.005), PP > 65 mmHg (P = 0.006) and a higher vascular calcification score (>or= 3) (P = 0.002). CONCLUSIONS: These results suggest that lower levels of [25(OH)D3] are a cardiovascular risk marker in HD patients, since they are strongly associated with higher BNP levels, increased PP and with the presence of vascular calcifications. The exact role of [25(OH)D3] deficiency on cardiovascular morbi-mortality needs to be clarified in large randomized controlled trials.

Breast cancer (BC) stands out as the most commonly type of cancer diagnosed in women worldwide, and chemotherapy, a key component of treatment, exacerbates cancer-induced skeletal muscle wasting, contributing to adverse health outcomes. Notably, the impact of chemotherapy on skeletal muscle seems to surpass that of the cancer itself, with inflammation identified as a common trigger for muscle wasting in both contexts. In skeletal muscle, pro-inflammatory cytokines modulate pathways crucial for the delicate balance between protein synthesis and breakdown, as well as satellite cell activation and myonuclear accretion. Physical exercise consistently emerges as a crucial therapeutic strategy to counteract cancer and chemotherapy-induced muscle wasting, ultimately enhancing patients' quality of life. However, a "one size fits all" approach does not apply to the prescription of exercise for BC patients, with factors such as age, menopause and comorbidities influencing the response to exercise. Hence, tailored exercise regimens, considering factors such as duration, frequency, intensity, and type, are essential to maximize efficacy in mitigating muscle wasting and improving disease outcomes. Despite the well-established anti-inflammatory role of aerobic exercise, resistance exercise proves equally or more beneficial in terms of mass and strength gain, as well as enhancing quality of life. This review comprehensively explores the molecular pathways affected by distinct exercise regimens in the skeletal muscle of cancer patients during chemotherapy, providing critical insights for precise exercise implementation to prevent skeletal muscle wasting.

Bone loss leads to increase risk of fractures in renal transplantation. The aim of this study was to analyse the relationship between bone densitometry (DXA) findings, bone histomorphometry and bone-related molecules 1-year after renal transplantation. We performed a cross-sectional study of de novo renal transplanted patients that agreed to perform a bone biopsy and a DXA examination 1 year after transplantation. All patients underwent a laboratory evaluation, bone biopsy, DXA examination and cardiac CT 1 year after transplantation. 67 patients were included, 16 had a normal examination, and 18 patients were classified as having osteoporosis by DXA. Correlations between bone mineral density and T-scores of total femur and femoral neck were the ones that best correlated with bone volume assessed by a bone biopsy. The sensitivity of DXA for osteoporosis diagnosis was 47.0%, and the specificity was 81.2%. The positive predictive value was 50.0%, and the negative predictive value (NPV) was 80.0%. DXA parameters also correlated with klotho and sclerostin serum levels. In this population, a normal examination excluded the presence of osteoporosis, helping in identifying patients that would not benefit from therapy. Overall, densitometry in total femur and femoral neck correlated well with bone volume measured by bone biopsy.