bims-bicyki Biomed News
on Bicaudal-C1 and interactors in cystic kidney disease
Issue of 2021‒12‒05
thirteen papers selected by
Céline Gagnieux
École Polytechnique Fédérale de Lausanne (EPFL)
  1. Tolvaptan vs. somatostatin in the treatment of ADPKD: A review of the literature.
  2. Treatment persistence to tolvaptan in patients with autosomal dominant polycystic kidney disease: a secondary use of data analysis of patients in the IMADJIN® dataset.
  3. Mechanical Stretch Induces Annulus Fibrosus Cell Senescence through Activation of the RhoA/ROCK Pathway.
  4. Mechanical Properties of Isolated Primary Cilia Measured by Micro-tensile Test and Atomic Force Microscopy.
  5. Cilia locally synthesize proteins to sustain their ultrastructure and functions.
  6. A change of heart: new roles for cilia in cardiac development and disease.
  7. Evolutionarily conserved genetic interactions between nphp-4 and bbs-5 mutations exacerbate ciliopathy phenotypes.
  8. Rho kinase inhibition ameliorates vascular remodeling and blood pressure elevations in a rat model of apatinib-induced hypertension.
  9. Collection, Expansion, and Differentiation of Primary Human Nasal Epithelial Cell Models for Quantification of Cilia Beat Frequency.
  10. The bitter end: T2R bitter receptor agonists elevate nuclear calcium and induce apoptosis in non-ciliated airway epithelial cells.
  11. Nonspecific binding of common anti-CFTR antibodies in ciliated cells of human airway epithelium.
  12. Modeling cell protrusion predicts how Myosin II and actin turnover affect adhesion-based signaling.
  13. Paxillin Promotes Breast Tumor Collective Cell Invasion through Maintenance of Adherens Junction Integrity.
  1. Clin Nephrol. 2021 Nov 30.
    Tolvaptan vs. somatostatin in the treatment of ADPKD: A review of the literature.
    Ivana Capuano, Pasquale Buonanno, Eleonora Riccio, Manuela Rizzo, Antonio Pisani.
      Autosomal dominant polycystic kidney disease (ADPKD) is the most common genetic disorder with an estimated prevalence between 1 : 1,000 and 1 : 2,500. Until a few decades ago, ADPKD was considered an untreatable disease, relentlessly progressing towards end-stage renal disease because of the lack of specific interventions. In the last decade, some aberrant molecular pathways involved in ADPKD development have been identified, and controlled clinical trials have been conducted to investigate the potential role of active drugs on these pathophysiological mechanisms such somatostatin and tolvaptan. Somatostatin analogues have been shown to be effective not only in ADPKD, but also in polycystic liver disease (PLD) with beneficial effect on cardiac function and a better cost/benefit profile; the only somatostatin analogue currently available for clinical use is octreotide long-acting release (octreotide-LAR), and it is approved only in Italy. On the contrary, tolvaptan is authorized worldwide and has received more attention in the last years, even if its clinical use is widely limited by aquaresis tolerability. The aim of this review is to investigate the advantages and drawbacks of somatostatin analogues and tolvaptan in the treatment of ADPKD.
    DOI:  https://doi.org/10.5414/CN110510
  2. BMC Nephrol. 2021 Dec 02. 22(1): 400
    Treatment persistence to tolvaptan in patients with autosomal dominant polycystic kidney disease: a secondary use of data analysis of patients in the IMADJIN® dataset.
    Mark Thomas, Pedro Henrique Franca Gois, Belinda E Butcher, Michelle H T Ta, Greg W Van Wyk.
      BACKGROUND: Tolvaptan is the only available disease-modifying treatment for autosomal dominant polycystic kidney disease (ADPKD). Prior to October 2020 access to tolvaptan in Australia was restricted by a controlled monitoring and distribution program called IMADJIN®. Focusing on hepatic safety, the IMADJIN® program collected real-world data on patients with ADPKD. A retrospective, secondary data analysis of the IMADJIN® dataset was undertaken to determine the time to all-cause discontinuation of tolvaptan in Australia.METHODS: Demographic and treatment data from 17 September 2018 to 30 September 2020 were extracted from the IMADJIN® dataset. Treatment persistence was analyzed using Kaplan-Meier methods, and Cox's proportional hazard models were used to analyze differences in treatment persistence by age, sex and location.
    RESULTS: Four hundred seventy-nine patients with ADPKD were included in the analysis. After a median follow-up of 12.0 months (95% confidence interval [CI] 2.6, 23.4), the Kaplan-Meier estimation of 12-month persistence was 76.7% (95% CI 72.2, 80.5%). 114 (23.8%) patients discontinued treatment; sex, state, and remoteness did not significantly affect treatment persistence. Patients in the youngest tertile were more likely to discontinue compared to older ages (p = 0.049). Reasons for discontinuation included: aquaretic tolerability (4.2%), hepatic adverse events (abnormal liver function tests) (2.1%), disease progression (1.5%), and acute kidney injury (0.2%). Patients with a lack of aquaretic tolerance had shorter time to discontinuation. Hepatic toxicity events were initially observed 3 months after tolvaptan initiation and were less prevalent over time.
    CONCLUSIONS: Persistence to tolvaptan in the real-world IMADJIN® dataset was 76%. Discontinuation due to hepatic events was low. Prescribers should take extra care when initiating treatment in younger patients as they are more likely to discontinue tolvaptan compared to older individuals. Nevertheless, the precise reason for this observation remains to be elucidated.
    Keywords:  Australia; Autosomal dominant polycystic kidney disease; Medication persistence; Real world evidence; Tolvaptan
    DOI:  https://doi.org/10.1186/s12882-021-02607-4
  3. Biomed Res Int. 2021 ;2021 5321121
    Mechanical Stretch Induces Annulus Fibrosus Cell Senescence through Activation of the RhoA/ROCK Pathway.
    Li Ning, Lei Gao, Fan Zhang, Xiaoxiao Li, Tingting Wang.
      Background: Intervertebral disc is responsible for absorbing and transmitting mechanical compression. Under physiological conditions, the peripheral annulus fibrosus (AF) cells are subjected to different magnitudes of transverse mechanical stretch depending on the swelling of the central nucleus pulposus tissue. However, the biological behavior of AF cells under mechanical stretch is not well studied.Objective: This study was performed to study the effects of mechanical tension on AF cell senescence and the potential signaling transduction pathway.
    Methods: Rat AF cells were made to experience different magnitudes of mechanical stretch (2% elongation and 20% elongation for 4 hours every day at 1 Hz) in a 10-day experiment period. The inhibitor RKI-1447 of the Rho-associated coiled-coil-containing protein kinases (ROCK) was added along with culture medium to investigate its role. Cell proliferation, cell cycle, telomerase activity, and expression of senescence markers (p16 and p53) were analyzed.
    Results: We found that 20% elongation significantly decreased cell proliferation, promoted G0/G1 cell cycle arrest, decreased telomerase activity, and upregulated mRNA/protein expression of p16 and p53. Moreover, the inhibitor RKI-1447 partly resisted effects of 20% elongation on these parameters of cell senescence.
    Conclusion: High mechanical stretch obviously induces AF cell senescence through the RhoA/ROCK pathway. This study provides us a deeper understanding on the AF cell's behavior under mechanical stretch.
    DOI:  https://doi.org/10.1155/2021/5321121
  4. Front Bioeng Biotechnol. 2021 ;9 753805
    Mechanical Properties of Isolated Primary Cilia Measured by Micro-tensile Test and Atomic Force Microscopy.
    Tien-Dung Do, Jimuro Katsuyoshi, Haonai Cai, Toshiro Ohashi.
      Mechanotransduction is a well-known mechanism by which cells sense their surrounding mechanical environment, convert mechanical stimuli into biochemical signals, and eventually change their morphology and functions. Primary cilia are believed to be mechanosensors existing on the surface of the cell membrane and support cells to sense surrounding mechanical signals. Knowing the mechanical properties of primary cilia is essential to understand their responses, such as sensitivity to mechanical stimuli. Previous studies have so far conducted flow experiments or optical trap techniques to measure the flexural rigidity EI (E: Young's modulus, I: second moment of inertia) of primary cilia; however, the flexural rigidity is not a material property of materials and depends on mathematical models used in the determination, leading to a discrepancy between studies. For better characterization of primary cilia mechanics, Young's modulus should be directly and precisely measured. In this study, the tensile Young's modulus of isolated primary cilia is, for the first time, measured by using an in-house micro-tensile tester. The different strain rates of 0.01-0.3 s-1 were applied to isolated primary cilia, which showed a strain rate-dependent Young's modulus in the range of 69.5-240.0 kPa on average. Atomic force microscopy was also performed to measure the local Young's modulus of primary cilia, showing the Young's modulus within the order of tens to hundreds of kPa. This study could directly provide the global and local Young's moduli, which will benefit better understanding of primary cilia mechanics.
    Keywords:  AFM test; isolated primary cilia; micro-tensile test; viscoelasticity; young’s modulus
    DOI:  https://doi.org/10.3389/fbioe.2021.753805
  5. Nat Commun. 2021 Nov 30. 12(1): 6971
    Cilia locally synthesize proteins to sustain their ultrastructure and functions.
    Kai Hao, Yawen Chen, Xiumin Yan, Xueliang Zhu.
      Cilia are microtubule-based hair-like organelles propelling locomotion and extracellular liquid flow or sensing environmental stimuli. As cilia are diffusion barrier-gated subcellular compartments, their protein components are thought to come from the cell body through intraflagellar transport or diffusion. Here we show that cilia locally synthesize proteins to maintain their structure and functions. Multicilia of mouse ependymal cells are abundant in ribosomal proteins, translation initiation factors, and RNA, including 18 S rRNA and tubulin mRNA. The cilia actively generate nascent peptides, including those of tubulin. mRNA-binding protein Fmrp localizes in ciliary central lumen and appears to function in mRNA delivery into the cilia. Its depletion by RNAi impairs ciliary local translation and induces multicilia degeneration. Expression of exogenous Fmrp, but not an isoform tethered to mitochondria, rescues the degeneration defects. Therefore, local translation defects in cilia might contribute to the pathology of ciliopathies and other diseases such as Fragile X syndrome.
    DOI:  https://doi.org/10.1038/s41467-021-27298-1
  6. Nat Rev Cardiol. 2021 Dec 03.
    A change of heart: new roles for cilia in cardiac development and disease.
    Lydia Djenoune, Kathryn Berg, Martina Brueckner, Shiaulou Yuan.
      Although cardiac abnormalities have been observed in a growing class of human disorders caused by defective primary cilia, the function of cilia in the heart remains an underexplored area. The primary function of cilia in the heart was long thought to be restricted to left-right axis patterning during embryogenesis. However, new findings have revealed broad roles for cilia in congenital heart disease, valvulogenesis, myocardial fibrosis and regeneration, and mechanosensation. In this Review, we describe advances in our understanding of the mechanisms by which cilia function contributes to cardiac left-right axis development and discuss the latest findings that highlight a broader role for cilia in cardiac development. Specifically, we examine the growing line of evidence connecting cilia function to the pathogenesis of congenital heart disease. Furthermore, we also highlight research from the past 10 years demonstrating the role of cilia function in common cardiac valve disorders, including mitral valve prolapse and aortic valve disease, and describe findings that implicate cardiac cilia in mechanosensation potentially linking haemodynamic and contractile forces with genetic regulation of cardiac development and function. Finally, given the presence of cilia on cardiac fibroblasts, we also explore the potential role of cilia in fibrotic growth and summarize the evidence implicating cardiac cilia in heart regeneration.
    DOI:  https://doi.org/10.1038/s41569-021-00635-z
  7. Genetics. 2021 Nov 22. pii: iyab209. [Epub ahead of print]
    Evolutionarily conserved genetic interactions between nphp-4 and bbs-5 mutations exacerbate ciliopathy phenotypes.
    Melissa R Bentley-Ford, Melissa LaBonty, Holly R Thomas, Courtney J Haycraft, Mikyla Scott, Cameron LaFayette, Mandy J Croyle, Reagan S Andersen, John M Parant, Bradley K Yoder.
      Primary cilia are sensory and signaling hubs with a protein composition that is distinct from the rest of the cell due to the barrier function of the transition zone (TZ) at the base of the cilium. Protein transport across the TZ is mediated in part by the BBSome, and mutations disrupting TZ and BBSome proteins cause human ciliopathy syndromes. Ciliopathies have phenotypic variability even among patients with identical genetic variants, suggesting a role for modifier loci. To identify potential ciliopathy modifiers, we performed a mutagenesis screen on nphp-4 mutant Caenorhabditis elegans and uncovered a novel allele of bbs-5. Nphp-4;bbs-5 double mutant worms have phenotypes not observed in either individual mutant strain. To test whether this genetic interaction is conserved, we also analyzed zebrafish and mouse mutants. While Nphp4 mutant zebrafish appeared overtly normal, Bbs5 mutants exhibited scoliosis. When combined, Nphp4;Bbs5 double mutant zebrafish did not exhibit synergistic effects, but the lack of a phenotype in Nphp4 mutants makes interpreting these data difficult. In contrast, Nphp4;Bbs5 double mutant mice were not viable and there were fewer mice than expected carrying three mutant alleles. In addition, postnatal loss of Bbs5 in mice using a conditional allele compromised survival when combined with an Nphp4 allele. As cilia are still formed in the double mutant mice, the exacerbated phenotype is likely a consequence of disrupted ciliary signaling. Collectively, these data support an evolutionarily conserved genetic interaction between Bbs5 and Nphp4 alleles that may contribute to the variability in ciliopathy phenotypes.
    Keywords:   C. elegans ; BBS5; Cilia; NPHP4; mice; zebrafish
    DOI:  https://doi.org/10.1093/genetics/iyab209
  8. J Hypertens. 2021 Dec 02.
    Rho kinase inhibition ameliorates vascular remodeling and blood pressure elevations in a rat model of apatinib-induced hypertension.
    Caie Li, Liping Ma, Qiongying Wang, Xuejiao Shao, Lu Guo, Jianshu Chen, Wenjuan Wang, Jing Yu.
      OBJECTIVES: Hypertension is one of the major adverse effects of tyrosine kinase inhibitors (TKIs) targeting vascular endothelial growth factors. However, the mechanism underlying TKIs-induced hypertension remains unclear. Here, we explored the role of the RhoA/Rho kinase (ROCK) signaling pathway in elevation of blood pressure (BP) induced by apatinib, a selective TKI approved in China for treatment of advanced or metastatic gastric cancer. A nonspecific ROCK inhibitor, Y27632, was then combined with apatinib and its efficacy in alleviating apatinib-induced hypertension was evaluated.METHODS: Normotensive female Wistar-Kyoto rats were exposed to two different doses of apatinib, or apatinib combined with Y27632, or vehicle for 2 weeks. BP was monitored by a tail-cuff plethysmography system. The mRNA levels and protein expression in the RhoA/ROCK pathway were determined, and vascular remodeling assessed.
    RESULTS: Administration of either a high or low dose of apatinib was associated with a rapid rise in BP, reaching a plateau after 12 days. Apatinib treatment mediated upregulation of RhoA and ROCK II in the mid-aorta, more significant in the high-dose group. However, ROCK I expression showed no statistically significant differences. Furthermore, the mRNA level of GRAF3 decreased dose-dependently. Apatinib administration was also associated with decreased levels of MLCP, and elevated endothelin-1 (ET-1) and collagen I, which were accompanied with increased mid-aortic media. However, treatment with Y27632 attenuated the above changes.
    CONCLUSION: These findings suggest that activation of the RhoA/ROCK signaling pathway could be the underlying mechanism of apatinib-induced hypertension, while ROCK inhibitor have potential therapeutic value.
    DOI:  https://doi.org/10.1097/HJH.0000000000003060
  9. J Vis Exp. 2021 Nov 10.
    Collection, Expansion, and Differentiation of Primary Human Nasal Epithelial Cell Models for Quantification of Cilia Beat Frequency.
    Katelin M Allan, Sharon L Wong, Laura K Fawcett, Alexander Capraro, Adam Jaffe, Cristan Herbert, Elvis Pandzic, Shafagh A Waters.
      Measurements of cilia function (beat frequency, pattern) have been established as diagnostic tools for respiratory diseases such as primary ciliary dyskinesia. However, the wider application of these techniques is limited by the extreme susceptibility of ciliary function to changes in environmental factors e.g., temperature, humidity, and pH. In the airway of patients with Cystic Fibrosis (CF), mucus accumulation impedes cilia beating. Cilia function has been investigated in primary airway cell models as an indicator of CF Transmembrane conductance Regulator (CFTR) channel activity. However, considerable patient-to-patient variability in cilia beating frequency has been found in response to CFTR-modulating drugs, even for patients with the same CFTR mutations. Furthermore, the impact of dysfunctional CFTR-regulated chloride secretion on ciliary function is poorly understood. There is currently no comprehensive protocol demonstrating sample preparation of in vitro airway models, image acquisition, and analysis of Cilia Beat Frequency (CBF). Standardized culture conditions and image acquisition performed in an environmentally controlled condition would enable consistent, reproducible quantification of CBF between individuals and in response to CFTR-modulating drugs. This protocol describes the quantification of CBF in three different airway epithelial cell model systems: 1) native epithelial sheets, 2) air-liquid interface models imaged on permeable support inserts, and 3) extracellular matrix-embedded three-dimensional organoids. The latter two replicate in vivo lung physiology, with beating cilia and production of mucus. The ciliary function is captured using a high-speed video camera in an environment-controlled chamber. Custom-built scripts are used for the analysis of CBF. Translation of CBF measurements to the clinic is envisioned to be an important clinical tool for predicting response to CFTR-modulating drugs on a per-patient basis.
    DOI:  https://doi.org/10.3791/63090
  10. Cell Calcium. 2021 Nov 08. pii: S0143-4160(21)00153-6. [Epub ahead of print]101 102499
    The bitter end: T2R bitter receptor agonists elevate nuclear calcium and induce apoptosis in non-ciliated airway epithelial cells.
    Derek B McMahon, Li Eon Kuek, Madeline E Johnson, Paige O Johnson, Rachel L J Horn, Ryan M Carey, Nithin D Adappa, James N Palmer, Robert J Lee.
      Bitter taste receptors (T2Rs) localize to airway motile cilia and initiate innate immune responses in retaliation to bacterial quorum sensing molecules. Activation of cilia T2Rs leads to calcium-driven NO production that increases cilia beating and directly kills bacteria. Several diseases, including chronic rhinosinusitis, COPD, and cystic fibrosis, are characterized by loss of motile cilia and/or squamous metaplasia. To understand T2R function within the altered landscape of airway disease, we studied T2Rs in non-ciliated airway cell lines and primary cells. Several T2Rs localize to the nucleus in de-differentiated cells that typically localize to cilia in differentiated cells. As cilia and nuclear import utilize shared proteins, some T2Rs may target to the nucleus in the absence of motile cilia. T2R agonists selectively elevated nuclear and mitochondrial calcium through a G-protein-coupled receptor phospholipase C mechanism. Additionally, T2R agonists decreased nuclear cAMP, increased nitric oxide, and increased cGMP, consistent with T2R signaling. Furthermore, exposure to T2R agonists led to nuclear calcium-induced mitochondrial depolarization and caspase activation. T2R agonists induced apoptosis in primary bronchial and nasal cells differentiated at air-liquid interface but then induced to a squamous phenotype by apical submersion. Air-exposed well-differentiated cells did not die. This may be a last-resort defense against bacterial infection. However, it may also increase susceptibility of de-differentiated or remodeled epithelia to damage by bacterial metabolites. Moreover, the T2R-activated apoptosis pathway occurs in airway cancer cells. T2Rs may thus contribute to microbiome-tumor cell crosstalk in airway cancers. Targeting T2Rs may be useful for activating cancer cell apoptosis while sparing surrounding tissue.
    Keywords:  Bacterial infection; Caspase; Chemosensation; Chronic rhinosinusitis; Cyclic-AMP; Cystic fibrosis; G protein-coupled receptor (GPCR); Mucosal immunology; Nitric oxide; Pseudomonas aeruginosa
    DOI:  https://doi.org/10.1016/j.ceca.2021.102499
  11. Sci Rep. 2021 Dec 01. 11(1): 23256
    Nonspecific binding of common anti-CFTR antibodies in ciliated cells of human airway epithelium.
    Yukiko Sato, Kamila R Mustafina, Yishan Luo, Carolina Martini, David Y Thomas, Paul W Wiseman, John W Hanrahan.
      There is evidence that the cystic fibrosis transmembrane conductance regulator (CFTR) anion channel is highly expressed at the apical pole of ciliated cells in human bronchial epithelium (HBE), however recent studies have detected little CFTR mRNA in those cells. To understand this discrepancy we immunostained well differentiated primary HBE cells using CFTR antibodies. We confirmed apical immunofluorescence in ciliated cells and quantified the covariance of the fluorescence signals and that of an antibody against the ciliary marker centrin-2 using image cross-correlation spectroscopy (ICCS). Super-resolution stimulated emission depletion (STED) imaging localized the immunofluorescence in distinct clusters at the bases of the cilia. However, similar apical fluorescence was observed when the monoclonal CFTR antibodies 596, 528 and 769 were used to immunostain ciliated cells expressing F508del-CFTR, or cells lacking CFTR due to a Class I mutation. A BLAST search using the CFTR epitope identified a similar amino acid sequence in the ciliary protein rootletin X1. Its expression level correlated with the intensity of immunostaining by CFTR antibodies and it was detected by 596 antibody after transfection into CFBE cells. These results may explain the high apparent expression of CFTR in ciliated cells and reports of anomalous apical immunofluorescence in well differentiated cells that express F508del-CFTR.
    DOI:  https://doi.org/10.1038/s41598-021-02420-x
  12. Biophys J. 2021 Nov 30. pii: S0006-3495(21)03882-0. [Epub ahead of print]
    Modeling cell protrusion predicts how Myosin II and actin turnover affect adhesion-based signaling.
    Ankit Chandra, Mitchell T Butler, James E Bear, Jason M Haugh.
      Orchestration of cell migration is essential for development, tissue regeneration, and the immune response. This dynamic process integrates adhesion, signaling, and cytoskeletal subprocesses across spatial and temporal scales. In mesenchymal cells, adhesion complexes bound to extracellular matrix (ECM) mediate both biochemical signal transduction and physical interaction with the F-actin cytoskeleton. Here, we present a mathematical model that offers insight into both aspects, considering spatiotemporal dynamics of nascent adhesions, active signaling molecules, mechanical clutching, actin treadmilling, and nonmuscle myosin II (NMII) contractility. At the core of the model is a positive feedback loop, whereby adhesion-based signaling promotes generation of barbed ends at, and protrusion of, the cell's leading edge, which in turn promotes formation and stabilization of nascent adhesions. The model predicts a switch-like transition and optimality of membrane protrusion, determined by the balance of actin polymerization and retrograde flow, with respect to ECM density. The model, together with new experimental measurements, explains how protrusion can be modulated by mechanical effects (NMII contractility and adhesive bond stiffness) and F-actin turnover.
    DOI:  https://doi.org/10.1016/j.bpj.2021.11.2889
  13. Mol Biol Cell. 2021 Dec 01. mbcE21090432
    Paxillin Promotes Breast Tumor Collective Cell Invasion through Maintenance of Adherens Junction Integrity.
    Weiyi Xu, Kyle M Alpha, Nicholas M Zehrbach, Christopher E Turner.
      Distant organ metastasis is linked to poor prognosis during cancer progression. The expression level of the focal adhesion adapter protein paxillin varies among different human cancers, but its role in tumor progression is unclear. Herein, we utilize a newly generated PyMT mammary tumor mouse model with conditional paxillin ablation in breast tumor epithelial cells, combined with in vitro 3D tumor organoids invasion analysis and 2D calcium switch assays, to assess the roles for paxillin in breast tumor cell invasion. Paxillin had little effect on primary tumor initiation and growth but is critical for the formation of distant lung metastasis. In paxillin-depleted 3D tumor organoids, collective cell invasion was substantially perturbed. Two-dimensional cell culture revealed paxillin-dependent stabilization of adherens junctions (AJ). Mechanistically, paxillin is required for AJ assembly through facilitating E-cadherin endocytosis and recycling and HDAC6-mediated microtubule acetylation. Furthermore, Rho GTPase activity analysis and rescue experiments with a RhoA activator or Rac1 inhibitor suggest paxillin is potentially regulating the E-cadherin-dependent junction integrity and contractility through control of the balance of RhoA and Rac1 activities. Together, these data highlight new roles for paxillin in the regulation of cell-cell adhesion and collective tumor cell migration to promote the formation of distance organ metastases. [Media: see text] [Media: see text] [Media: see text] [Media: see text] [Media: see text] [Media: see text] [Media: see text] [Media: see text].
    DOI:  https://doi.org/10.1091/mbc.E21-09-0432
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