Effect Of Exercise Training On Endothelium-Dependent Vasodilation In Cerebral Arteries

Endothelial function and expression of endothlelial nitric oxide synthase (eNOS) have been shown to increase with exercise training in the peripheral vasculature. However, the effect of exercise training on endothelial function in the cerebral vasculature is poorly understood. PURPOSE: The purpose of this study was to determine the effect of exercise training on endothelium-dependent vasodilation of large cerebral arteries. METHODS: Three-month-old male Fischer 344 rats were assigned to either a sedentary (SED, n=4) or exercise-trained (ET, n=4) group. ET rats ran on a motorized rodent treadmill 60 min/day at 15 m/min (15 incline), 5 d/wk for 10 wk. Posterior communicating arteries (PCoA) were isolated from the brain of both SED and ET rats. The isolated arteries were cannulated and pressurized to 90 cm H2O via hydrostatic reservoirs. Luminal diameter changes were determined in response to the endothelium-dependent vasodilator, Bradykinin (BK) (10-13 – 10-7 M) and the direct vascular smooth muscle dilator, sodium nitroprusside (SNP, 10-10 – 10-4 M). RESULTS: Responsiveness to the endothelium-dependent vasodilator BK was enhanced in PCoA of ET rats compared to SED rats, whereas responsiveness to the endothelium-independent vasodilator SNP was not different between PCoA of SED and ET rats. CONCLUSION: These data demonstrate that exercise training is associated with enhanced endothelium-mediated vasodilation in PCoA of young rats, whereas vascular smooth muscle responsiveness of PCoA is unaffected by exercise training

Effects Of Aging On Endothelium-Dependent Vasodilation In Cerebral Arteries

Regional cerebral blood flow (CBF) decreases with aging. This reduction may be due to a diminished endothelium-dependent vasodilation in large cerebral arteries with aging in the absence of disease. The posterior communicating arteries (PCoA) supply blood flow to the midbrain areas where age-related regional decreases in blood flow have been observed. Furthermore, the PCoA appear to be clinically relevant in age-related cerebrovascular disorders. However, age-related changes in the vasoreactivity of PCoA have not been investigated in the absence of disease. The purpose of this study was to determine the effect of aging on endothelium-dependent vasodilation of PCoA in rats. Posterior communicating arteries (PCoA) were isolated from the brain of 4 month old (n = 4) and 24 month old (n = 4) male Fischer 344 rats. The isolated arteries were cannulated and pressurized to 90 cm H2O via hydrostatic reservoirs. Luminal diameter changes were determined in response to the endothelium-dependent vasodilator, Bradykinin (BK) (10-13 – 10-7 M) and the direct vascular smooth muscle dilator, sodium nitroprusside (SNP, 10-10 – 10-4 M). Responsiveness to the endothelium-dependent vasodilator BK was diminished in PCoA of aged rats compared to young rats, whereas responsiveness to the endothelium-independent vasodilator SNP was not different between PCoA of young and old rats. These data demonstrate that aging is associated with diminished endothelium-dependent vasodilation in PCoA, whereas vascular smooth muscle responsiveness remains intact. Thus, regional age-related reductions in cerebral blood flow may be related to diminished endothelium-dependent vasodilation in PCoA

The human right to a clean, healthy and sustainable ocean

The United Nations General Assembly adopted a resolution in 2022 that formally recognizes that there is a universal human right to a clean, healthy and sustainable environment. Yet there is evidence that human rights impacts associated with the degradation of the ocean environment are accelerating. In this perspective, we highlight how the recognition of the human right to a healthy environment can catalyze ocean action and transform ocean governance. In particular, it can do so through 1) catalyzing marine protection and increasing accountability through clarifying state obligations, 2) improving the inclusiveness of ocean governance, including through prioritizing and empowering groups in situations of vulnerability, and 3) enhancing ocean economy practices through clarifying private sector responsibilities. To those ends, there is an urgent need to move from recognition to implementation in order to protect both current and future generations’ human right to a clean, healthy and sustainable ocean

Aging and the burden of multimorbidity: Associations with inflammatory and anabolic hormonal biomarkers

open9siThe InCHIANTI study baseline (1998–2000) was supported as a “targeted project” (ICS110.1/RF97.71) by the Italian Ministry of Health and in part by the U.S. National Institute on Aging (contracts: 263 MD 9164 and 263 MD 821336); the InCHIANTI Follow-up 1 (2001–2003) was funded by the U.S. National Institute on Aging (contracts: N.1-AG-1-1 and N.1-AG-1-2111); the InCHIANTI Follow-ups 2 and 3 studies (2004–2010) were financed by the U.S. National Institute on Aging (contract: N01-AG-5-0002); supported in part by the Intramural Research Program of the National Institute on Aging, National Institutes of Health, Baltimore, MarylandBackground. Multimorbidity increases with aging, but risk factors beyond age are unknown. Objective. To investigate the association of inflammatory and anabolic hormonal biomarkers with presence and prospective development of multimorbidity. Methods. Nine-year longitudinal study of 1018 participants aged 60 years or older (InCHIANTI Study). Multimorbidity was evaluated at baseline and follow-up visits as number of diagnosed diseases from a predefined list of 15 candidate chronic conditions, defined according to standard clinical criteria. Linear mixed models were used to test cross-sectional and longitudinal associations between candidate biomarkers and multimorbidity. Results. At baseline, multimorbidity was significantly higher in older participants (p <. 001) and higher IL-6, IL-1ra, TNF-α receptor II (TNFAR2), and lower dehydroepiandrosterone sulfate were associated with higher number of diseases, independent of age, sex, body mass index, and education. The rate of longitudinal increase in number of chronic diseases was significantly steeper in participants who were older at baseline (p <. 001). In addition, higher baseline IL-6 and steeper increase of IL-6 levels were significantly and independently associated with a steeper increase in multimorbidity over time (p <. 001 and p =. 003, respectively). Sensitivity analyses, performed using 15 different models obtained by removing each of 15 conditions included in the original list of candidate diseases, confirmed that results were not driven by any specific condition. Conclusions. Accumulation of chronic diseases accelerates at older ages and in persons with higher baseline levels and steeper increase over time of IL-6. High IL-6 and increase in IL-6 may serve as early warning sign to better target interventions aimed at reducing the burden of multimorbidity.openFabbri, Elisa; An, Yang; Zoli, Marco; Simonsick, Eleanor M.; Guralnik, Jack M.; Bandinelli, Stefania; Boyd, Cynthia M.; Ferrucci, LuigiFabbri, Elisa; An, Yang; Zoli, Marco; Simonsick, Eleanor M.; Guralnik, Jack M.; Bandinelli, Stefania; Boyd, Cynthia M.; Ferrucci, Luig

Termination of pregnancy for fetal anomaly after 23 weeks of gestation: a European register-based study.

Objective To determine the prevalence of termination of pregnancy for fetal anomaly (TOPFA) after 23 weeks of gestation in European countries, and describe the spectrum of anomalies for which late TOPFA is recorded. Design Population-based study. Setting Twelve European countries. Population Nineteen registries of congenital anomaly in 12 European countries between 2000 and 2005. The number of total births covered was 2 695 832. Methods TOPFAs in singleton pregnancies from the European Surveillance of Congenital Anomalies and Twins (EUROCAT)database. Main outcome measures The prevalence of TOPFA and type of anomaly. Results There were 10 233 TOPFAs, 678 (6.6%) of which were performed at 24 weeks or more. The rate of TOPFA before 24 weeks was 3.4 per 1000 births, at 24-25 weeks 0.14 per 1000 births and at 26 weeks or more 0.11 per 1000 births. There was significant variation in the prevalence of TOPFA at ?24 weeks between countries (P < 0.001), with all countries in the range 0-0.55 per 1000 births, except France (Paris) at 2.65 per 1000 births. The large majority of late TOPFAs had a gestational age of 24-27 weeks (516/678, 76%). The proportion of TOPFAs from 24 weeks or more varied by type of anomaly, with 4% of all TOPFAs for chromosomal anomalies and 9% of all TOPFAs for nonchromosomal anomalies resulting in late TOPFA (P < 0.001). For transposition of the great arteries, single ventricle, hypoplastic left heart and hydrocephaly, the percentage of late TOPFA was 12-23%. The median time interval between diagnosis and late TOPFA was 2 weeks for most anomalies, but longer (?5 weeks) for diaphragmatic hernia, omphalocoele, arthrogryposis multiplex and Turner\u27s syndrome. Conclusion Late TOPFA is rare in Europe, and varies in prevalence between countries. Compared with earlier TOPFA, late TOPFA is more often performed for a nonchromosomal isolated major structural anomaly and less often for a fetus with a chromosomal syndrome or multiple anomalies

Oesophageal atresia: prevalence, prenatal diagnosis and associated anomalies in 23 European regions

Objective To describe prevalence, prenatal diagnosis and epidemiological data on oesophageal atresia from 23 well-defined European regions and compare the prevalence between these regions. Design Population-based study using data from a large European database for surveillance of congenital anomalies (EUROCAT) for two decades (1987-2006). Settings Twenty-three participating registries based on multiple sources of information including information about live births, fetal deaths with gestational age &#8805;20 weeks and terminations of pregnancy. Patients 1222 cases of oesophageal atresia in a population of 5 019 804 births. Results The overall prevalence was 2.43 cases per 10 000 births (95% CI 2.30 to 2.57). There were regional differences in prevalence ranging from 1.27 to 4.55. Prenatal detection rates varied by registry from >50% of cases to <10% of cases. A total of 546 cases (44.7%) had an isolated oesophageal anomaly, 386 (31.6%) were multiple malformed and 290 (23.7%) had an association or a syndrome. There were 1084 live born cases (88.7%), 43 cases were fetal deaths and 95 cases were terminations of pregnancy. One-week survival for live births was 86.9% and 99.2% if the gestational age was &#8805;38 weeks and isolated oesophageal atresia was present. Males accounted for 57.3% of all cases and 38.5% of live born cases were born with gestational age <37 weeks. Conclusion There were regional differences in prevalence of oesophageal atresia in Europe. Half of all cases had associated anomalies. Prenatal detection rate increased from 26% to 36.5% over the two decades. Survival in infants with isolated oesophageal atresia born at term is hig

The First Habitable Zone Earth-Sized Planet From TESS II: Spitzer Confirms TOI-700 d

We present Spitzer 4.5 μm observations of the transit of TOI-700 d, a habitable-zone Earth-sized planet in a multiplanet system transiting a nearby M-dwarf star (TIC 150428135, 2MASS J06282325–6534456). TOI-700 d has a radius of 1.144^(+0.062)_(-0.061) R⊕ and orbits within its host star's conservative habitable zone with a period of 37.42 days (T_(eq) ~ 269 K). TOI-700 also hosts two small inner planets (R_b = 1.037^(+0.0065)_(-0.064) R⊕ and R_c = 2.65^(+0.16)_(-0.15) R⊕) with periods of 9.98 and 16.05 days, respectively. Our Spitzer observations confirm the Transiting Exoplanet Survey Satellite (TESS) detection of TOI-700 d and remove any remaining doubt that it is a genuine planet. We analyze the Spitzer light curve combined with the 11 sectors of TESS observations and a transit of TOI-700 c from the LCOGT network to determine the full system parameters. Although studying the atmosphere of TOI-700 d is not likely feasible with upcoming facilities, it may be possible to measure the mass of TOI-700 d using state-of-the-art radial velocity (RV) instruments (expected RV semiamplitude of ~70 cm s⁻¹)

TIC 168789840: A Sextuply-Eclipsing Sextuple Star System

We report the discovery of a sextuply-eclipsing sextuple star system from TESS data, TIC 168789840, also known as TYC 7037-89-1, the first known sextuple system consisting of three eclipsing binaries. The target was observed in Sectors 4 and 5 during Cycle 1, with lightcurves extracted from TESS Full Frame Image data. It was also previously observed by the WASP survey and ASAS-SN. The system consists of three gravitationally-bound eclipsing binaries in a hierarchical structure of an inner quadruple system with an outer binary subsystem. Follow-up observations from several different observatories were conducted as a means of determining additional parameters. The system was resolved by speckle interferometry with a 0."42 separation between the inner quadruple and outer binary, inferring an estimated outer period of ~2 kyr. It was determined that the fainter of the two resolved components is an 8.217 day eclipsing binary, which orbits the inner quadruple that contains two eclipsing binaries with periods of 1.570 days and 1.306 days. MCMC analysis of the stellar parameters has shown that the three binaries of TIC 168789840 are "triplets", as each binary is quite similar to the others in terms of mass, radius, and Teff. As a consequence of its rare composition, structure, and orientation, this object can provide important new insight into the formation, dynamics, and evolution of multiple star systems. Future observations could reveal if the intermediate and outer orbital planes are all aligned with the planes of the three inner eclipsing binaries