摘要： Investigating plant morphological traits can provide insights into plant drought tolerance. To date, many papers have focused on plant hydraulic responses to drought during dehydration, but atmospheric water absorption by trichomes to mitigate drought stress by influencing leaf hydraulics in plant species that inhabit arid environments has been largely ignored. The experiment in this study was designed to assess how dew absorbed by leaf trichomes helps Caragana korshinskii withstand drought. The results showed that under a drought stress and dew (DS & D) treatment, C. korshinskii displayed a strong capacity to absorb dew with trichomes;exhibited slow decreases in leaf water potential (psi(leaf)), leaf hydraulic conductivity (K-leaf), and gas exchange;experienced 50% K-leaf and gas exchange losses at lower relative soil water content levels than plants treated with drought stress and no dew (DS & ND);and experienced 50% K-leaf loss (K-leaf P-50) at similar psi(leaf) levels as DS & ND plants. Its congener C. sinica, which does not have leaf trichomes, displayed little ability to absorb dew under drought stress and did not show any remarkable improvement in the above parameters under the DS & D treatment. Our results indicated that leaf trichomes are important epidermal dew-uptake structures that assist in partially sustaining the leaf hydraulic assimilation system, mitigate the adverse effects of drought stress and contribute to the distribution of C. korshinskii in arid environments.

关键词： Salivary stone   Sialolithiasis   Salivary duct obstruction   Wharton duct   Submandibular duct   Sialolithotomy   Salivary endoscopy   Sialendoscopy  

摘要： Sialoendoscopy is a valuable technique for a variety of obstructive and nonobstructive disorders of the major salivary glands. However, the utility of sialoscopes is limited for salivary stones, which frequently required open removal. Transoral sialolithotomy without scopes is an efficient, low-cost alternative with excellent outcomes available for most of the submandibular stones.

摘要： The glaring racial inequities in the impact of the COVID-19 pandemic and the devastating loss of Black lives at the hands of police and racist vigilantes have catalyzed a global reckoning about deeply rooted systemic racism in society. Many medical training institutions in the United States have participated in this discourse by denouncing racism, expressing solidarity with people of color, and reexamining their diversity and inclusion efforts. Yet, the stagnant progress in recruiting, retaining, and supporting racial/ethnic minority trainees and faculty at medical training institutions is well documented and reflects unaddressed systemic racism along the academic pipeline. In this article, the authors draw upon their experiences as early-career physicians of color who have led and supported antiracism efforts within their institutions to highlight key barriers to achieving meaningful progress. They describe common pitfalls of diversity and inclusion initiatives and call for an antiracist approach to systems change. The authors then offer 9 recommendations that medical training institutions can implement to critically examine and address racist structures within their organizations to actualize racial equity and justice.

关键词： Crime and punishment   Deterrence   Retribution   Corrective justice  

摘要： This essay compares two alternative economic theories of crime, due to Becker (1968) and Adelstein (2017), which differ with respect to the purpose of punishment. Both models are based on the idea of rational offenders and punishments as prices, but they part company with respect to how the level of punishment is, or should be, determined. Whereas Becker's approach is based on the normative goal of welfare maximization and optimal deterrence, Adelstein's model emphasizes that the system actually pursues corrective justice in individual cases. This essay explicates these different perspectives and explores their implications for social welfare.

关键词： alternative splicing   denervation skeletal muscle atrophy   gene expression regulation   Obscn   RNA‐   binding proteins  

摘要： Alternative splicing (AS) presents a key posttranscriptional regulatory mechanism associated with numerous physiological processes. However, little is known about its role in skeletal muscle atrophy. In this study, we used a rat model of denervated skeletal muscle atrophy and performed RNA-sequencing to analyze transcriptome profiling of tibialis anterior muscle at multiple time points following denervation. We found that AS is a novel mechanism involving muscle atrophy, which is independent changes at the transcript level. Bioinformatics analysis further revealed that AS transitions are associated with the appearance of the atrophic phenotype. Moreover, we found that the inclusion of multiple highly conserved exons of Obscn markedly increased at 3 days after denervation. In addition, we confirmed that this newly transcript inhibited C2C12 cell proliferation and exacerbated myotube atrophy. Finally, our study revealed that a large number of RNA-binding proteins were upregulated when the atrophy phenotype appeared. Our data emphasize the importance of AS in this process.

关键词： alveolar type II cells   idiopathic pulmonary fibrosis   macrophage alternative activation   osteopontin   Sonic hedgehog  

摘要： The alternative activation of macrophages in the lungs has been considered as a major factor promoting pulmonary fibrogenesis;however, the mechanisms underlying this phenomenon are still elusive. In this study, we investigated the interaction between macrophages and fibrosis-associated alveolar epithelial cells using a bleomycin-induced mouse pulmonary fibrosis model and a coculture system. We demonstrated that fibrosis-promoting macrophages are spatially proximate to alveolar type II (ATII) cells, permissive for paracrine-induced macrophage polarization. Importantly, we revealed that fibrosis-associated ATII cells secrete Sonic hedgehog (Shh), a hedgehog pathway ligand, and that ATII cell-derived Shh promotes the development of pulmonary fibrosis by osteopontin (OPN)-mediated macrophage alternative activation. Mechanistically, Shh promotes the secretion of OPN in macrophages via Shh/Gli signaling cascade. The secreted OPN acts on the surrounding macrophages in an autocrine or paracrine manner and induces macrophage alternative activation through activating the JAK2/STAT3 signaling pathway. Tissue samples from idiopathic pulmonary fibrosis patients confirmed the increased expression of Shh and OPN in ATII cells and macrophages, respectively. Together, our study illustrated an alveolar epithelium-dependent mechanism for macrophage M2 polarization and pulmonary fibrogenesis and suggested that targeting Shh may offer a selective and efficient therapeutic strategy for the development and progression of pulmonary fibrosis.

摘要： In their study of the effect of an LCHF-diet on blood lipids, Burén et al. [...]

关键词： Corneal endothelium   Endothelial decompensation   Transplantation   Endothelial keratoplasty   Cell-based therapy   Tissue engineering   Cell injection   Endothelial regeneration   Animal model  

摘要： Current treatment for corneal endothelial dysfunction consists in the replacement of corneal endothelium by keratoplasty. Owing to the scarcity of donor corneas and the increasing number of transplants, alternative treatments such as cell-based therapies are necessary. In this article, we highlight the biological aspects of the cornea and the corneal endothelium, as well as the context that surrounds the need for new alternatives to conventional keratoplasty. We then review some of those experimental treatments in more detail, focusing on the development of the in vitro and preclinical phases of two cell-based therapies: tissue-engineered endothelial keratoplasty (TE-EK) and cell injection. In the case of TE-EK graft construction, we analyse the current progress, considering all the requirements it must meet in order to be functional. Moreover, we discuss the inherent drawbacks of endothelial keratoplasties, which TE-EK grafts should overcome in order to make surgical intervention easier and to improve the outcomes of current endothelial keratoplasties. Finally, we analyse the development of preclinical trials and their limitations in terms of performing an optimal functional evaluation of cell-based therapy, and we conclude by discussing early clinical trials in humans.

关键词： Phosphate metabolism   Saccharomyces cerevisiae   Non-coding transcription   Bimodal gene expression   Transcription start site  

摘要： Dependent on phosphate availability the yeast Saccharomyces cerevisiae expresses either low or high affinity phosphate transporters. In the presence of phosphate yeast cells still express low levels of the high affinity phosphate transporter Pho84. The regulator Spl2 is expressed in approximately 90% of the cells, and is not expressed in the remaining cells. Here we report that deletion of RRP6, encoding an exonuclease degrading non-coding RNA, or BMH1, encoding the major 14-3-3 isoform, resulted in less cells expressing SPL2 and in increased levels of RNA transcribed from sequences upstream of the SPL2 coding region. SPL2 stimulates its own expression and that of PHO84 ensuing a positive feedback. Upon deletion of the region responsible for upstream SPL2 transcription almost all cells express SPL2. These results indicate that the cell-to-cell variation in PHO84 and SPL2 expression is dependent on a specific part of the SPL2 promoter and is controlled by Bmh1 and Spl2.

关键词： COVID-19   Gut-lung axis   Probiotics   Systemic cytokine storm   Dysbiosis  

摘要： Respiratory and gastrointestinal symptoms are the predominant clinical manifestations of the coronavirus disease 2019 (COVID-19). Infecting intestinal epithelial cells, the severe acute respiratory syndrome coronavirus-2 may impact on host's microbiota and gut inflammation. It is well established that an imbalanced intestinal microbiome can affect pulmonary function, modulating the host immune response ("gut-lung axis"). While effective vaccines and targeted drugs are being tested, alternative pathophysiology-based options to prevent and treat COVID-19 infection must be considered on top of the limited evidence-based therapy currently available. Addressing intestinal dysbiosis with a probiotic supplement may, therefore, be a sensible option to be evaluated, in addition to current best available medical treatments. Herein, we summed up pathophysiologic assumptions and current evidence regarding bacteriotherapy administration in preventing and treating COVID-19 pneumonia.