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Labile heme is present in the cells at very low concentrations, either unbound or loosely bound to molecules, and accessible for signaling as alarmin. Our recent work suggests that extracellular heme can be taken up and detected in the nuclei of cancer cells. Here, we describe the detailed protocol for detection of labile and total heme in prostate cancer cells and its measurement in subcellular compartments in vitro. The protocol can be adapted to be used for other cell types. For complete details on the use and execution of this protocol, please refer to Canesin et al. (2020).Isolated myofibers offer the possibility of in vitro study of satellite cells in their niche. We describe a mouse myofiber isolation assay to assess satellite cell activation by quantifying myofiber-derived satellite cell progeny. The assay allows isolation of myofibers from a mouse using standard equipment and reagents. It can be used to compare satellite cells across different mouse models or to evaluate their response to treatments, offering a valuable complementary tool for in vitro experimentation.The majority of the mammalian genome is transcribed into non-coding RNAs, many of which co-evolve with RNA-binding proteins (RBPs) to function as biochemically defined and tractable ribonucleoproteins (RNPs). Here, we applied icSHAPE- a robust and versatile RNA structural probing pipeline- to endogenous RNPs purified from nuclei, providing base-resolution structural rationale for RNP activity and subcellular localization. Combining with genetic and biochemical reconstitutions, structural and functional alternations can be directly attributed to a given RBP without ambiguity. For complete details on the use and execution of this protocol, please refer to Chen et al. (2018).Determination of a substrate's surface energy profile is a facile and inexpensive method to indicate the substrate's interfacial thermodynamics with another substance (e.g., microorganisms, biomacromolecules, medical devices, etc). The following protocol details a goniometric method to calculate a substrate's surface energy profile which (1) directly correlates to a substrate's interfacial Gibbs energy (ΔG) and (2) predicts the interfacial interactions with other substances. We also provide a calculation template using advanced mathematics to expedite surface energy profile determination. For complete details on the use and execution of this protocol, please refer to Cavitt et al. (2020).The jugular-nodose ganglia contain the sensory peripheral neurons of the vagus nerve, linking visceral organs to the medulla oblongata. Accessing these ganglia in smaller animals without damaging the vascular and neural structures may be challenging, as ganglionic fibers imbed deeply into the carotid sheath, and vagal parasympathetic fibers cross through the interior of the ganglia. We describe a practical protocol for locating and accessing the mouse jugular-nodose ganglia in vivo, including instructions for intraganglionic injections and postperfusion dissection. For complete details on the use and execution of this protocol, please refer to Han et al. (2018).This protocol describes the embedding and processing of Drosophila pupae in paraffin to monitor tissue changes during development. Although multiple methods are available to evaluate developmental changes in Drosophila embryos, imaging detailed changes during metamorphosis is challenging as the animal is enclosed in the cuticle, rendering it inaccessible to whole mount imaging. Here, we present a protocol that focuses on developmental clearance of the larval salivary glands in Drosophila pupae that can be extended to examine other tissues/stages for similar purposes. For complete details on the use and execution of this protocol, please refer to Velentzas et al. (2018).This protocol describes the detailed procedures for utilizing human pluripotent stem cells (hPSCs) for pancreatic progenitor and hepatic differentiation, followed by the application of hPSC-derived cells in a luciferase reporter-based assay to study gene regulation. The generated hPSC-derived cells have been shown to achieve morphologies and gene expression profiles specific to their differentiated cell types, and subsequent luciferase assay has been shown to effectively elucidate the role of disease-relevant gene variants. Therefore, this protocol provides a valuable approach for pancreatic and liver disease modeling. For complete details on the use and execution of this protocol, please refer to Ng et al. (2019).Hypoxia is known to stimulate mitochondrial reactive oxygen species (mROS) in cells. Here, we present a detailed protocol to detect mROS using MitoSOX staining in live cells under normoxia and hypoxia. Flow cytometry allows sensitive and reliable quantification of mROS by FlowJo software. We optimized several aspects of the procedure including hypoxic treatment, working concentrations of the staining buffer, and quantitative analyses. Here, we use HepG2 cells, but the protocol can be applied to other cell lines. For complete details on the use and execution of this protocol, please refer to Yang et al. (2020).Here, we describe a high-throughput 3D differentiation protocol for deriving midbrain dopaminergic neurons from human pluripotent stem cells. The use of organoids has become prevalent in disease modeling, but there is a high demand for more homogeneous cultures. Finerenone mw Our approach is advantageous for large-scale production of uniform midbrain organoids that can be maintained in diverse formats, and our reporters allow for sorting of dopaminergic neurons. The maturing long-term organoid cultures can be used as a model for the entire midbrain. For complete details on the use and execution of this protocol, please refer to Ahfeldt et al. (2020).This protocol for the separation of nuclear and cytoplasmic fractions of cells of Xenopus laevis embryos was developed to study changes in the intracellular localization of the Zyxin and Ybx1 proteins, which are capable of changing localization in response to certain stimuli. Western blot analysis allows the quantification of changes in the distribution of these proteins between the cytoplasm and nucleus, whereas the posttranslational modifications specific to each compartment can be identified by changes in electrophoretic mobility. For complete details on the use and execution of this protocol, please refer to Parshina et al. (2020).
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