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Divergent responses of particulate and mineral-associated organic carbon to permafrost degradation
No full textNeuropeptide CRH prevents premature differentiation of OPCs following CNS injury and in early postnatal development
No full text501100004189 Max Planck Societ
Central bank announcements and monitoring portfolio risks
No full texthttp://dx.doi.org/10.13039/501100001659 German Research Foundatio
Pressure-temperature-time deformation of an Ediacaran-Cambrian foreland fold-and-thrust belt: the Southern Espinhaço Front, Araçuaí Orogen
No full texthttp://dx.doi.org/10.13039/501100002322 Coordination of Higher Education Personnel Improvementhttp://dx.doi.org/10.13039/501100001807 State of Sao Paulo Research Foundationhttp://dx.doi.org/10.13039/501100003593 National Council for Scientific and Technological Developmen
Clinical and echocardiographic phenotype of cardiac wasting in patients with advanced cancer
No full textABSTRACT Aims Cardiac wasting‐associated cardiomyopathy in patients with advanced cancer is characterized by loss of left ventricular (LV) mass and independently associated with poor prognosis. Better understanding of this very prevalent cardiomyopathy is urgently needed. Methods and results Overall, 398 patients with active, mostly advanced cancer without significant cardiovascular disease (mean LV ejection fraction [LVEF] 64.3 ± 0.2%) or active infection were prospectively examined (mean age 60 ± 1 years, 50% women, body mass index 25.0 ± 0.2 kg/m 2 , 26% cachectic). Patients were categorized and compared by quartiles of LV mass/height 2 . LVEF, global longitudinal strain (GLS), and anticancer therapy naive status were similar across quartiles. Patients in Q1 (lowest LV mass quartile) were younger, more likely cachectic, had lower: BMI, 10‐step stair‐climbing power, tricuspid annular plane systolic excursion (TAPSE), stroke volume, cardiac output, and higher heart rate. In repeat follow‐up assessments after 140 ± 8 days ( n = 143), LVEF, TAPSE, LV mass, left atrial volume, and GLS were found reduced (all p ≤ 0.002). Only in those with above‐median LV mass at baseline, cardiac output and heart rate increased during follow‐up – in those with below‐median LV mass, mitral E/A decreased. Conclusions Patients with advanced cancer with low LV mass have a distinct phenotype characterized by lower cardiac chamber volumes, stroke volume, and cardiac output, but normal LVEF and GLS that may be the distinct feature of cardiac wasting‐associated cardiomyopathy.Deutsches Zentrum für Herz-Kreislaufforschung https://doi.org/10.13039/10001044
Opportunistic Short‐Term Water Uptake Dynamics by Subalpine Trees Observed via In Situ Water Isotope Measurements
No full textAbstract Variations in tree water sources are important to understand in semi‐arid ecosystems because climatic shifts towards lower snowpack and increased drought affect water availability in subalpine forests of the western US. Here, we use daily in situ measurements of stable isotopes ( 2 H & 18 O) in soil and tree stem water, soil matric potential and sap flow to study tree water uptake dynamics. We instrumented three soil profiles down to 90 cm, as well as three aspen and engelmann spruce trees near Gothic, Colorado, in the East River watershed. We observed the fate of natural isotopic variations in rainfall, soil, and plants from June to October 2022, and in August 2023 we conducted a 2 H labeled irrigation experiment. Our observations showed that all studied aspen trees compensated for water scarcity in the shallow soil by shifting the dominant water source at 60(±20) cm to ⅔ of uptake from 90 cm within a few days of a dry period. Both species relied on snowmelt stored in the subsoil to sustain transpiration. Intense rainfall caused the plant water uptake to shift partially to top soil layers within 2 days. Spruce transpiration was lower and relied more on snowmelt, because rainfall infiltration was low in the spruce stand due to high canopy interception. Our findings highlight the important role of snowmelt stored in the deep soil layers for subalpine forest drought response and the dominant fate of monsoonal rainfall to become transpiration rather than recharging groundwater and streams in the Upper Colorado River.Plain Language Summary There is a need to understand how trees in mountainous regions respond to dry conditions that lead to water scarcity, because climate projections suggest that such conditions will become more frequent in the future. Here we present a novel data set of measurements of daily stable isotopes of water across soil profiles and in tree stems of aspen and spruce. Our data show that when the upper soil dried out, aspen trees shifted to using water from deeper layers (beneath 60 cm) to keep transpiring. For spruce trees the uptake pattern is less clear, but both types of trees mainly used snowmelt stored in the deeper soil layers to survive the dry summer. After heavy rain, aspen and spruce trees switched to using water from the top 20 cm of soil. However, for spruce, only some rain reached the soil because the dense tree canopy intercepted it, so spruce trees stayed more dependent on snowmelt and used less water overall. This study shows how important deep snowmelt water is for helping forests survive dry periods and suggests that most summer rain is quickly used by trees rather than replenishing streams and groundwater in the headwaters of the Colorado River.Key Points Tree water resources changed within a few days from snow dominated to higher share of rainfall as soils wetted up after a dry period Compensatory plant water uptake by aspen from the deep layer (90 cm), while uptake from soil depths that became drier (60 cm) declined Strong differences between water sources and availability beneath aspen and spruce, respectivelyAbstract Variations in tree water sources are important to understand in semi‐arid ecosystems because climatic shifts towards lower snowpack and increased drought affect water availability in subalpine forests of the western US. Here, we use daily in situ measurements of stable isotopes ( 2 H & 18 O) in soil and tree stem water, soil matric potential and sap flow to study tree water uptake dynamics. We instrumented three soil profiles down to 90 cm, as well as three aspen and engelmann spruce trees near Gothic, Colorado, in the East River watershed. We observed the fate of natural isotopic variations in rainfall, soil, and plants from June to October 2022, and in August 2023 we conducted a 2 H labeled irrigation experiment. Our observations showed that all studied aspen trees compensated for water scarcity in the shallow soil by shifting the dominant water source at 60(±20) cm to ⅔ of uptake from 90 cm within a few days of a dry period. Both species relied on snowmelt stored in the subsoil to sustain transpiration. Intense rainfall caused the plant water uptake to shift partially to top soil layers within 2 days. Spruce transpiration was lower and relied more on snowmelt, because rainfall infiltration was low in the spruce stand due to high canopy interception. Our findings highlight the important role of snowmelt stored in the deep soil layers for subalpine forest drought response and the dominant fate of monsoonal rainfall to become transpiration rather than recharging groundwater and streams in the Upper Colorado River.Plain Language Summary There is a need to understand how trees in mountainous regions respond to dry conditions that lead to water scarcity, because climate projections suggest that such conditions will become more frequent in the future. Here we present a novel data set of measurements of daily stable isotopes of water across soil profiles and in tree stems of aspen and spruce. Our data show that when the upper soil dried out, aspen trees shifted to using water from deeper layers (beneath 60 cm) to keep transpiring. For spruce trees the uptake pattern is less clear, but both types of trees mainly used snowmelt stored in the deeper soil layers to survive the dry summer. After heavy rain, aspen and spruce trees switched to using water from the top 20 cm of soil. However, for spruce, only some rain reached the soil because the dense tree canopy intercepted it, so spruce trees stayed more dependent on snowmelt and used less water overall. This study shows how important deep snowmelt water is for helping forests survive dry periods and suggests that most summer rain is quickly used by trees rather than replenishing streams and groundwater in the headwaters of the Colorado River.Key Points Tree water resources changed within a few days from snow dominated to higher share of rainfall as soils wetted up after a dry period Compensatory plant water uptake by aspen from the deep layer (90 cm), while uptake from soil depths that became drier (60 cm) declined Strong differences between water sources and availability beneath aspen and spruce, respectivelyAbstract Variations in tree water sources are important to understand in semi‐arid ecosystems because climatic shifts towards lower snowpack and increased drought affect water availability in subalpine forests of the western US. Here, we use daily in situ measurements of stable isotopes ( 2 H & 18 O) in soil and tree stem water, soil matric potential and sap flow to study tree water uptake dynamics. We instrumented three soil profiles down to 90 cm, as well as three aspen and engelmann spruce trees near Gothic, Colorado, in the East River watershed. We observed the fate of natural isotopic variations in rainfall, soil, and plants from June to October 2022, and in August 2023 we conducted a 2 H labeled irrigation experiment. Our observations showed that all studied aspen trees compensated for water scarcity in the shallow soil by shifting the dominant water source at 60(±20) cm to ⅔ of uptake from 90 cm within a few days of a dry period. Both species relied on snowmelt stored in the subsoil to sustain transpiration. Intense rainfall caused the plant water uptake to shift partially to top soil layers within 2 days. Spruce transpiration was lower and relied more on snowmelt, because rainfall infiltration was low in the spruce stand due to high canopy interception. Our findings highlight the important role of snowmelt stored in the deep soil layers for subalpine forest drought response and the dominant fate of monsoonal rainfall to become transpiration rather than recharging groundwater and streams in the Upper Colorado River.Plain Language Summary There is a need to understand how trees in mountainous regions respond to dry conditions that lead to water scarcity, because climate projections suggest that such conditions will become more frequent in the future. Here we present a novel data set of measurements of daily stable isotopes of water across soil profiles and in tree stems of aspen and spruce. Our data show that when the upper soil dried out, aspen trees shifted to using water from deeper layers (beneath 60 cm) to keep transpiring. For spruce trees the uptake pattern is less clear, but both types of trees mainly used snowmelt stored in the deeper soil layers to survive the dry summer. After heavy rain, aspen and spruce trees switched to using water from the top 20 cm of soil. However, for spruce, only some rain reached the soil because the dense tree canopy intercepted it, so spruce trees stayed more dependent on snowmelt and used less water overall. This study shows how important deep snowmelt water is for helping forests survive dry periods and suggests that most summer rain is quickly used by trees rather than replenishing streams and groundwater in the headwaters of the Colorado River.Key Points Tree water resources changed within a few days from snow dominated to higher share of rainfall as soils wetted up after a dry period Compensatory plant water uptake by aspen from the deep layer (90 cm), while uptake from soil depths that became drier (60 cm) declined Strong differences between water sources and availability beneath aspen and spruce, respectivelyU.S. Department of Energy https://doi.org/10.13039/100000015Laboratory Directed Research and Development https://doi.org/10.13039/100007000Lawrence Berkeley National Laboratory https://doi.org/10.13039/10000623
Targeting macrophage migration inhibitory factor as a potential therapeutic strategy in colorectal cancer
No full textAbstract Survival rates for patients with late-stage colorectal cancer (CRC) remain low due to limited efficacy of current therapeutic regimens. To overcome these challenges, novel drug targets are urgently needed. Macrophage migration inhibitory factor (MIF), an upstream immunoregulatory cytokine, has emerged as a potential target due to its multifaceted role in cancer pathogenesis. During tumorigenesis, MIF protein levels are often elevated in tumor cells through chaperone-mediated stabilization. Although several in vivo studies have implicated MIF in tumor initiation and progression, its role in sustaining established tumors, particularly when derived from epithelial tumor cells, remained unclear. Using a constitutive Mif knockout mouse model, we previously demonstrated that MIF is required for CRC development. Now, we expanded our experimental CRC model towards a more therapeutic rationale. We hypothesized that epithelial-derived MIF is essential for tumor maintenance and might serve as a possible cancer drug target. Therefore, we depleted epithelial MIF during late-stage CRC tumorigenesis in two genetically-engineered and chemically-induced murine CRC models. Our proof-of-principle study reveals that Mif depletion in epithelial tumor cells attenuates cancer maintenance in both CRC models, coinciding with reduced macrophage recruitment and angiogenesis. Our data highlight the potential utility of targeting MIF in CRC patients for therapeutic benefit
Multiple bursts of speciation in Madagascar’s endangered lemurs
No full textLemurs are often cited as an example of adaptive radiation, as more than 100 extant species have evolved and filled ecological niches on Madagascar. However, recent work suggests that lemurs lack a hallmark of other adaptive radiations: explosive speciation rates that decline over time. Thus, characterizing the tempo and mode of evolution in lemurs can reveal alternative ways that hyperdiverse clades arise over time, which might differ from traditional models. We explore lemur evolution using a phylogenomic dataset with broad taxonomic sampling that includes the lorisiforms of Asia and continental Africa. Our analyses reveal multiple bursts of diversification (without subsequent declines) that explain much of today's lemur diversity. We also find higher rates of speciation in Madagascar's lemurs compared to lorisiforms, and we demonstrate that the lemur clades with high diversification rates also have high rates of genomic introgression. This suggests that hybridization in these primates is not an evolutionary dead-end, but potential fuel for diversification. Considering the conservation crisis affecting strepsirrhine primates, with approximately 95% of species threatened with extinction, this study offers a perspective for explaining Madagascar's primate diversity and reveals patterns of speciation, extinction, and gene flow that will help inform future conservation decisions.National Science Foundation https://doi.org/10.13039/100000001University of Kentucky https://doi.org/10.13039/10000747
