Publications by authors named "Tam P"

Induction of the neural ectoderm and the patterning of embryonic brain are the requisite organizing activity for head formation. Studies of loss-of-function mouse mutants that displayed a head truncation phenotype pointed to a key functional role of the anterior mesendoderm in anterior neural patterning. In this overview, we highlight the learning of the molecular attributes underpinning the formation of the anterior mesendoderm, the acquisition of ectoderm competence in the epiblast and the patterning of the embryonic brain during gastrulation and neurulation.

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Biliary atresia (BA) is a severe neonatal cholestatic disorder marked by fibro-obliteration of the extrahepatic and intrahepatic bile ducts. It is the most common cause of pediatric end-stage liver disease and the leading indication for liver transplantation in children. There is significant heterogeneity in the etiology, involving various genetic and environmental factors such as viral infection, immune dysregulation and genetic predisposition to defective hepatobiliary development.

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Managing diabetes in patients on peritoneal dialysis (PD) is challenging due to the combined effects of dietary glucose, glucose from dialysate, and other medical complications. Advances in technology that enable continuous biological data collection are transforming traditional management approaches. This review explores how multi-omics technologies and artificial intelligence (AI) are enhancing glucose management in this patient population.

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Background: Despite the reported efficacy of overground robotic exoskeleton (ORE) for rehabilitation of mobility post-stroke, its effectiveness in real-world practice is still debated. We analysed prospectively collected data from Improving Mobility Via Exoskeleton (IMOVE), a multicentre clinical implementation programme of ORE enrolling participants with various neurological conditions and were given options to choose between 12 sessions of ORE or conventional therapy (control).

Methods: This is analysis of participants under IMOVE who fulfilled the following criteria (i) primary diagnosis was stroke (ischemic, hemorrhagic; first or recurrent), (ii) onset of stroke was within 9 months and (iii) the intervention was during inpatient stay.

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Measuring bipartite fluctuations of a conserved charge, such as the particle number, is a powerful approach to understanding quantum systems. When the measured region has sharp corners, the bipartite fluctuation receives an additional contribution known to exhibit a universal angle dependence in 2D isotropic and uniform systems. Here we establish that, for generic lattice systems of interacting particles, the corner charge fluctuation is directly related to quantum geometry.

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Background/objectives: Orthostatic hypotension (OH) is highly prevalent in hospitalized patients and can lead to major consequences. The prevalence of OH among patients with stroke has also been reported to be high in in-patient cohorts. However, no previous analysis has focused exclusively on patients with hemorrhagic stroke, a group that may have a different disease profile, including a greater need for blood pressure control and surgical intervention.

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  • EBV DNAemia surveillance is used to prevent post-transplant lymphoproliferative disorder (PTLD) in lung transplant recipients (LTRs), but its effectiveness in adult seropositive patients is unclear.
  • A study analyzed EBV viral loads in seropositive LTRs and compared levels between those who developed PTLD and those who didn't, revealing that peak viral loads were only significantly higher after PTLD was suspected.
  • The study found low positive predictive values (PPVs) for moderate (14.7%) and high-grade (33.3%) EBV DNAemia in indicating risk for future PTLD, suggesting improved diagnostic approaches are needed.
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  • The review investigates new regenerative medicine techniques to treat cholestatic liver fibrosis, which results from diseases like primary biliary cholangitis, leading to severe liver damage.
  • Understanding how these diseases progress is essential since current treatments mainly address underlying causes rather than the fibrosis itself.
  • The article highlights promising regenerative therapies like mesenchymal stem cell therapy and organoid technology, aiming to target fibrosis directly for better outcomes and potentially curative strategies.
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The canonical Hippo-YAP1 signaling pathway is crucial for liver development and regeneration, but its role in repair and regeneration of intrahepatic bile duct in biliary atresia (BA) remains largely unknown. YAP1 expression in the liver tissues of patients with BA and Rhesus rotavirus-induced experimental BA mouse models were examined using quantitative reverse transcriptase-PCR and double immunofluorescence. Mouse EpCAM-expressing cell-derived liver organoids were generated and treated with Hippo-YAP1 pathway activators (Xmu-mp-1 and TRULI) or an inhibitor (Peptide17).

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In this article, we comment on the article by Huang . The urgent development of new therapeutic strategies targeting macrophage polarization is critical in the fight against liver cancer. Tumor-associated macrophages (TAMs), primarily of the M2 subtype, are instrumental in cellular communication within the tumor microenvironment and are influenced by various signaling pathways, including the wingless/integrated (Wnt) pathway.

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  • Belatacept is used to prevent rejection in lung transplant patients, but the infection risks associated with its use haven't been thoroughly studied.
  • A retrospective study analyzed infections in 52 lung transplant recipients treated with belatacept from 2011 to 2022, revealing significant rates of viral and bacterial infections, particularly cytomegalovirus (CMV).
  • The findings highlight the need for collaborative research to further investigate infection risks and management strategies for lung transplant recipients receiving belatacept.
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  • * Researchers found that SNP rs11200647 had a significant association with myopia, particularly moderate myopia, and that other SNPs also showed nominal associations.
  • * The results imply that there may be shared genetic factors between myopia and age-related macular degeneration (AMD), providing new insights into the genetics of myopia.
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The neutralization of acidic solutions containing U (IV) and Ce (III) at room temperature in glove box atmosphere and in the presence of dithionite results in coprecipitation of these elements as amorphous solid solutions CeUO. The solubilities of the precipitates with different mole fractions (x) of Ce(OH) (x = 0.01 or 0.

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Aims: To investigate the associations of genetic variants previously linked to axial length (AL) and spherical equivalent refraction (SE) in adults with refractive error and related endophenotypes in children, at baseline and 3-year follow-up.

Methods: 15 candidate single-nucleotide polymorphisms (SNPs), selected from previous Genome-Wide Association Studies and meta-analyses, were genotyped in 2819 Chinese children, who had undergone baseline and 3-year follow-up cycloplegic refraction, ocular biometry and ocular health examinations. Linear regression analyses were conducted to assess the associations of the SNPs with baseline measurements and longitudinal changes in SE, spherical power (SPH), AL, corneal radius of curvature (CR) and AL/CR ratio.

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  • Historian Nick Hopwood discusses the fluctuating focus on human developmental biology over time in his companion piece.
  • The article features input from researchers across eight countries who share insights on how various local factors shape the development of this field.
  • This publication celebrates the 10th anniversary of a significant meeting on the topic of stem cells and human development.
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  • Kasai portoenterostomy (KPE) is the main treatment for biliary atresia (BA), but predicting outcomes is difficult due to unreliable biomarkers.
  • Researchers analyzed liver biopsies from BA patients before and after KPE and compared them to control liver samples, focusing on gene expression changes.
  • Findings suggest that high hepatocyte expression in KPE organoids may indicate abnormal cholangiocyte development, while a transition towards more cholangiocyte features in surviving patients suggests better biliary recovery.
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  • - On October 9, 2022, LHAASO detected a significant afterglow from the gamma-ray burst 221009A, achieving record photon statistics in the TeV energy range.
  • - This observation allowed researchers to test the idea of Lorentz invariance violation (LIV), which is related to faster-than-light travel predictions in some quantum gravity theories.
  • - The study established that the energy scales for LIV effects are significantly higher than previously thought, with new lower limits being 10 times the Planck energy for linear effects and 6×10^{-8} times the Planck energy for quadratic effects, improving earlier constraints by 5-7 times.
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In this Letter we try to search for signals generated by ultraheavy dark matter at the Large High Altitude Air Shower Observatory (LHAASO) data. We look for possible γ rays by dark matter annihilation or decay from 16 dwarf spheroidal galaxies in the field of view of the LHAASO. Dwarf spheroidal galaxies are among the most promising targets for indirect detection of dark matter that have low fluxes of astrophysical γ-ray background while having large amount of dark matter.

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Upper limb weakness following stroke poses a significant global psychosocial and economic burden. Non-invasive brain stimulation (NIBS) is a potential adjunctive treatment in rehabilitation. However, traditional approaches to rebalance interhemispheric inhibition may not be effective for all patients.

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Purpose: We performed animal and organoid study to evaluate the anti-fibrotic effect of steroid on biliary atresia (BA) and the underlying patho-mechanism.

Methods: BA animal models were created by inoculation of mice on post-natal day 1 with rhesus rotavirus (RRV). They received either 20 µl phosphate-buffered saline (PBS) or steroid from day 21 to day 34.

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Background: Fibroblast growth factor 23 (FGF-23) and other markers of chronic kidney disease-mineral and bone disorder (CKD-MBD) provide valuable insights into disease processes, treatment options and patient prognosis. However, limited research has explored potential associations with ethnicity or season, particularly in multi-ethnic populations residing in high-latitude regions.

Methods: We evaluated CKD-BMD markers in a diverse cohort of CKD patients, who were participants of The CANADIAN AIM to PREVENT (the CAN AIM to PREVENT) study.

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Mycoplasma hominis and Ureaplasma species are urogenital mollicutes that can cause serious donor-derived infections in lung transplant recipients. Best practices for mollicute screening remain unknown. We conducted a single-center prospective study analyzing lung transplants performed from October 5, 2020, to September 25, 2021, whereby donor and recipient bronchoalveolar lavage (BAL) samples obtained at time of transplant underwent mollicute screening via culture and polymerase chain reaction (PCR).

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  • - Biliary atresia (BA) is a serious liver condition affecting 1:5,000 to 1:20,000 newborns, mostly in Asia, characterized by damage to the biliary system leading to cholestasis, with its causes not fully understood but possibly linked to ciliary dysfunction and oxidative stress.
  • - Timely surgical intervention (Kasai portoenterostomy) can help restore bile flow, benefiting about 50-75% of patients, but many still face severe complications like cholangitis and liver failure, with more than half needing transplantation by age 18.
  • - Improved early diagnosis and coordinated care, along with ongoing research into disease mechanisms and therapies targeting the immune response or oxidative stress
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Defining the molecular networks orchestrating human brain formation is crucial for understanding neurodevelopment and neurological disorders. Challenges in acquiring early brain tissue have incentivized the use of three-dimensional human pluripotent stem cell (hPSC)-derived neural organoids to recapitulate neurodevelopment. To elucidate the molecular programs that drive this highly dynamic process, here, we generate a comprehensive trans-omic map of the phosphoproteome, proteome, and transcriptome of the exit of pluripotency and neural differentiation toward human cerebral organoids (hCOs).

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