We present improved germanium-based constraints on sub-GeV dark matter via dark matter-electron (χ-e) scattering using the 205.4 kg·day dataset from the CDEX-10 experiment. Using a novel calculation ...technique, we attain predicted χ-e scattering spectra observable in high-purity germanium detectors. In the heavy mediator scenario, our results achieve 3 orders of magnitude of improvement for m_{χ} larger than 80 MeV/c^{2} compared to previous germanium-based χ-e results. We also present the most stringent χ-e cross-section limit to date among experiments using solid-state detectors for m_{χ} larger than 90 MeV/c^{2} with heavy mediators and m_{χ} larger than 100 MeV/c^{2} with electric dipole coupling. The result proves the feasibility and demonstrates the vast potential of a new χ-e detection method with high-purity germanium detectors in ultralow radioactive background.
A search for exotic dark matter (DM) in the sub-GeV mass range has been conducted using 205 kg day data taken from a p-type point contact germanium detector of the CDEX-10 experiment at China's ...Jinping underground laboratory. New low-mass dark matter searching channels, neutral current fermionic DM absorption (χ+A→ν+A) and DM-nucleus 3→2 scattering (χ+χ+A→ϕ+A), have been analyzed with an energy threshold of 160 eVee. No significant signal was found; thus new limits on the DM-nucleon interaction cross section are set for both models at the sub-GeV DM mass region. A cross section limit for the fermionic DM absorption is set to be 2.5×10^{-46} cm^{2} (90% C.L.) at DM mass of 10 MeV/c^{2}. For the DM-nucleus 3→2 scattering scenario, limits are extended to DM mass of 5 and 14 MeV/c^{2} for the massless dark photon and bound DM final state, respectively.
Objectives
To investigate whether frailty modifies the association of systolic blood pressure (SBP) with cardiovascular mortality and all-cause mortality in community-dwelling older adults.
Design
A ...prospective cohort study.
Setting
A population-based study of nationally representative older Chinese adults in a community setting.
Participants
This study included participants aged 65 years or older from the Chinese Longitudinal Healthy Longevity Survey 2002–2014 and followed up to 2018.
Measurements
Participants were divided into two groups according to a frailty index based on the accumulation of a 44-items deficits model. The association between SBP and mortality was analyzed using multivariable-adjusted Cox proportional hazards models.
Results
Among 18,503 participants included, the mean age was 87.2 years and the overall median follow-up time was 42.7 months. We identified 7808 (42.2%) frail participants (mean frailty index=0.33), in which 7533 (96.5%) died during the follow-up. Effect modification by frailty was detected (P for interaction=0.032). Among frail participants, a U-shaped association was found with hazard ratios of 1.16 (95% CI, 1.02–1.32) for SBP < 100 mmHg, and 1.11 (95% CI, 1.00–1.24) for SBP ≥ 150 mmHg compared with SBP 120–130 mmHg. For non-frail older adults, a tendency toward higher risk among those with SBP ≥ 130 mmHg was observed. The analyses towards cardiovascular mortality showed similar results.
Conclusion
Our results suggest the presence of effect modification by frailty indicating a possible negative effect for elevated SBP in non-frail older adults and a U-shaped relationship of SBP in frail older adults with respect to mortality even after adjusting for diastolic blood pressure.
Abstract
In this paper, the multiwavelength data from radio to X-ray bands for 2709 blazars in the 4FGL-DR3 catalog are compiled to calculate their spectral energy distributions using a parabolic ...equation
log
(
ν
f
ν
)
=
P
1
log
ν
−
P
2
2
+
P
3
. Some important parameters including spectral curvature (
P
1
), synchrotron peak frequency (
P
2
,
log
ν
p
), and peak luminosity (
log
L
p
) are obtained. Based on those parameters, we discussed the classification of blazars using the “Bayesian classification” and investigated some mutual correlations. We came to the following results. (1) Based on the Bayesian classification of synchrotron peak frequencies, the 2709 blazars can be classified into three subclasses, i.e.,
log
(
ν
p
/
Hz
)
<
13.7
for low synchrotron peak blazars (LSPs),
13.7
<
log
(
ν
p
/
Hz
)
<
14.9
for intermediate synchrotron peak blazars (ISPs), and
log
(
ν
p
/
Hz
)
>
14.9
for high synchrotron peak blazars (HSPs), and there are 820 HSPs, 750 ISPs, and 1139 LSPs. (2) The
γ
-ray emission has the closest relationship with radio emission, followed by optical emission, while the weakest relationship is that with X-ray emission. The
γ
-ray luminosity is also correlated with the synchrotron peak luminosity. (3) There are strong positive correlations between the curvature (1/∣
P
1
∣) and the peak frequency (
log
ν
p
) for all subclasses (FSRQs, (high, intermediate, and low) BL Lacertae objects). For different subclasses, the correlation slopes are different, which implies that there are different acceleration mechanisms and emission processes for different subclasses of blazars.
Caudal-related homeobox 1 (CDX1), an intestinal-specific transcription factor, has been reported to have vital roles in gastric intestinal metaplasia (IM). Although IM is a high-risk factor for ...gastric cancer (GC), the specific role of CDX1 in GC is largely unknown. In this study, we investigated the expression of CDX1 and its functional roles in GC, and its upstream regulatory mechanisms at the microRNA (miRNA) level were further explored. We found that CDX1 is lost in GC when compared with adjacent IM tissues. Gain-of-function studies showed that CDX1 significantly inhibited GC cell growth by inducing cell cycle arrest and apoptosis. Interestingly, we identified and verified an onco-mir, miR-296-5p, as a direct upstream regulator of CDX1. miR-296-5p overexpression significantly promoted GC cell growth and attenuated the CDX1-induced anti-growth effects by recurring cell cycle distribution and apoptotic status, whereas knockdown of miR-296-5p decreased GC cell growth. Furthermore, we found that the extracellular signal-regulated kinases 1 and 2 (ERK1/2) activation and the subsequent downstream changes in protein levels related to cell cycle and apoptosis partly account for the miR-296-5p-CDX1-induced GC growth promotion. In addition, the detection of miR-296-5p and expression of CDX1 in primary GC tissues and adjacent IM tissues revealed that miR-296-5p is inversely correlated with CDX1, further supporting our in vitro results. Our results showed an anti-growth effect of CDX1 and identified its miRNA regulatory mechanism in GC. The identification of this novel miR-296-5p-CDX1-ERK1/2 axis sheds new light on the understanding of the process from IM to GC and may provide therapeutic targets for the treatment of GC.
Abstract
Aim
To evaluate the association of cardiovascular health (CVH) with incident heart failure (HF).
Methods
The China PEACE million persons project is a nationwide, government-funded and ...population-based cardiovascular disease (CVD) screening study. This was a sub-cohort study of the project that included community-dwelling adults free of CVD. Components of CVH, including diet, physical activity, smoking status, sleep status, body mass index (BMI), non-HDL, blood glucose and blood pressure, were collected using self-report questionnaires. Each component and CVH were categorized as poor, intermediate and ideal status based on the AHA Life’s Essential 8 criteria. HF cases were identified by linking hospital records.
Results
Among the cohort (n=38571, median age 54 years and women 60.5%), proportion of individuals with poor, intermediate and ideal CVH was 30.7%, 56.9% and 12.4% respectively. After a median follow-up of 3.6 years, the incidence of HF in individuals with poor, intermediate and ideal CVH was 2.5%, 1.1% and 0.5% (P<0.001). Compared to poor CVH, intermediate (adjusted HR: 0.52 95% CI: 0.43-0.61) and ideal CVH (adjusted HR: 0.38 95% CI: 0.26-0.57) were associated with a lower risk of incident HF. A gradient of association between CVH and risk of incident HF was observed (P-trend < 0.001). Ideal physical activity, ideal smoking status, and intermediate and ideal status of BMI, blood glucose and blood pressure were independently associated with a lower risk of incident HF.
Conclusion
Poor CVH was independently associated with an increased risk of incident HF and promotion of CVH may have important implications for HF prevention.Graphical abstract
Abstract
Aim
To evaluate the impacts of social determinant of health (SDOH) on major adverse cardiovascular event (MACE) and mortality risk in community-dwelling population.
Methods
The China PEACE ...million persons project is a nationwide, government-funded and population-based cardiovascular disease (CVD) screening study. This was a sub-cohort study of the project that included community-dwelling adults free of CVD from Guangdong Province. Metrics of SDOH, including education attainment, economic stability, health care access, social support and environment/neighborhood, were collected using self-report questionnaires. Each favorable metric was assigned 1 point, and individuals with 0-3 points were defined as low SDOH and those with 4-5 points were defined as high SDOH. MACE (including coronary heart disease/myocardial infarction, stroke, heart failure and cardiovascular death) and all-cause death were identified by linking hospital records.
Results
Among the cohort (n=38571, median age 54 years and women 60.5%), proportion of individuals with low SDOH was 68.9%. After a median follow-up of 3.6 years, compared to the high SDOH group, the low SDOH group had significantly higher event rate of MACE (7.2% vs 5.0%, P<0.001) and all-cause death (1.6% vs 0.9%, P<0.001). After adjusted for covariates, in reference to the high SDOH group, the adjusted hazard ratio (HR) for MACE in the low SDOH group was 1.18 (95% confidence interval CI 1.08-1.30) and for all-cause death was 1.35 (95% CI 1.09-1.68).
Conclusion
Low SDOH was associated with an increased risk of MACE and all-cause death. Concerted efforts are needed to reduce health disparities between individuals with low versus high SDOH.Graphical abstract
Recently a dark matter-electron (DM-electron) paradigm has drawn much attention. Models beyond the standard halo model describing DM accelerated by high energy celestial bodies are under intense ...examination as well. In this Letter, a velocity components analysis (VCA) method dedicated to swift analysis of accelerated DM-electron interactions via semiconductor detectors is proposed and the first HPGe detector-based accelerated DM-electron analysis is realized. Utilizing the method, the first germanium based constraint on sub-GeV solar reflected DM-electron interaction is presented with the 205.4 kg·day dataset from the CDEX-10 experiment. In the heavy mediator scenario, our result excels in the mass range of 5-15 keV/c^{2}, achieving a 3 orders of magnitude improvement comparing with previous semiconductor experiments. In the light mediator scenario, the strongest laboratory constraint for DM lighter than 0.1 MeV/c^{2} is presented. The result proves the feasibility and demonstrates the vast potential of the VCA technique in future accelerated DM-electron analyses with semiconductor detectors.
The recent rapid development in the field of extracellular vesicles (EVs) based nanotechnology has provided unprecedented opportunities for nanomedicine platforms. As natural nanocarriers, EVs such ...as exosomes, exosome-like nanoparticles and outer membrane vesicles (OMVs), have unique structure/composition/morphology characteristics, and show excellent physical and chemical/biochemical properties, making them a new generation of theranostic nanomedicine. Here, we reviewed the characteristics of EVs from the perspective of their formation and biological function in inflammatory bowel disease (IBD). Moreover, EVs can crucially participate in the interaction and communication of intestinal epithelial cells (IECs)-immune cells-gut microbiota to regulate immune response, intestinal inflammation and intestinal homeostasis. Interestingly, based on current representative examples in the field of exosomes and exosome-like nanoparticles for IBD treatment, it is shown that plant, milk, and cells-derived exosomes and exosome-like nanoparticles can exert a therapeutic effect through their components, such as proteins, nucleic acid, and lipids. Moreover, several drug loading methods and target modification of exosomes are used to improve their therapeutic capability. We also discussed the application of exosomes and exosome-like nanoparticles in the treatment of IBD. In this review, we aim to better and more clearly clarify the underlying mechanisms of the EVs in the pathogenesis of IBD, and provide directions of exosomes and exosome-like nanoparticles mediated for IBD treatment.
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