查看更多>>摘要：The prediction of affinity between TCRs and peptides is crucial for the further development of TIL(Tumor-Infiltrating Lymphocytes)immunotherapy.Inspired by the broader research of drug-protein interaction(DPI),we propose an atom-level peptide-TCR interaction(PTI)affinity prediction model APTAnet using natural language processing methods.APTAnet model achieved an average ROC-AUC and PR-AUC of 0.893 and 0.877,respectively,in ten-fold cross-validation on 25,675 pairs of PTI data.Furthermore,experimental results on an independent test set from the McPAS database showed that APTAnet outperformed the current mainstream models.Finally,through the validation on 11 cases of real tumor patient data,we found that the APTAnet model can effectively identify tumor peptides and screen tumor-specific TCRs.
查看更多>>摘要：Tumor metastasis,responsible for approximately 90％of cancer-associated mortality,remains poorly understood.Here in this study,we employed a melanoma lung metastasis model to screen for metastasis-related genes.By sequential tail vein injection of mouse melanoma B16F10 cells and the subsequently derived cells from lung metastasis into BALB/c mice,we successfully obtained highly metastatic B16F15 cells after five rounds of in vivo screening.RNA-sequencing analysis of B16F15 and B16F10 cells revealed a number of differentially expressed genes,some of these genes have previously been associated with tumor metastasis while others are novel discoveries.The identification of these metastasis-related genes not only improves our understanding of the metastasis mechanisms,but also provides potential diagnostic biomarkers and therapeutic targets for metastatic melanoma.
查看更多>>摘要：G protein-coupled receptors(GPCRs)are a large family of cell membrane proteins that are important targets for drug discovery.Nanobodies,also known as VHH(variable domains of heavy chain-only anti-bodies,HcAbs)antibodies,are small antibody fragments derived from camelids that have gained signif-icant attention as potential therapeutics for targeting GPCRs due to their advantages over conventional antibodies.However,there are challenges in developing nanobodies targeting GPCRs,among which epitope accessibility is the most significant because the cell membrane partially shields the GPCR sur-face.We developed a universal protocol for making nanobodies targeting GPCRs using the cell mem-brane extract of GPCR-overexpressing HEK293 cells as the llama/alpaca immunization antigen.We constructed an immune VHH library and identified nanobodies by phage display bio-panning.The mono-clonal nanobodies were recombinantly expressed in Escherichia coli(E.coli)and purified to character-ize their binding potency.
查看更多>>摘要：Soluble N-ethylmaleimide-sensitive factor attachment protein receptor(SNAER)family proteins are the engines of most intra-cellular and exocytotic membrane fusion pathways(Jahn and Scheller 2006).Over the past two decades,in-vitro liposome fusion has been proven to be a powerful tool to recon-struct physiological SNARE-mediated membrane fusion processes(Liu et al.2017).The reconstitution of the membrane fusion process not only provides direct evidence of the capability of the cognate SNARE complex in driving membrane fusion but also allows researchers to study the functional mecha-nisms of regulatory proteins in related pathways(Wickner and Rizo 2017).Heretofore,a variety of del-icate methods for in-vitro SNARE-mediated liposome fusion have been established(Bao et al.2018;Diao et al.2012;Duzgunes 2003;Gong et al.2015;Heo et al.2021;Kiessling et al.2015;Kreye et al.2008;Kyoung et al.2013;Liu et al.2017;Scott et al.2003).Although technological advances have made reconstitution more physiologically relevant,increasingly elaborate experimental procedures,instru-ments,and data processing algorithms nevertheless hinder the non-experts from setting up basic SNARE-mediated liposome fusion assays.Here,we describe a low-cost,timesaving,and easy-to-handle protocol to set up a foundational in-vitro SNARE-mediated liposome fusion assay based on our previ-ous publications(Liu et al.2023;Wang and Ma 2022).The protocol can be readily adapted to assess various types of SNARE-mediated membrane fusion and the actions of fusion regulators by using ap-propriate alternative additives(e.g.,proteins,macromolecules,chemicals,etc.).The total time required for one round of the assay is typically two days and could be extremely compressed into one day.
查看更多>>摘要：Substrate stiffness is a microenvironment with a certain stiffness constructed by the extracellular ma-trix and adjacent cells,which plays an important role in the growth and development of cells and tis-sue formation.Studies have indicated that the stiffness of the brain is about 0.1-1 kPa.The physiologi-cal and pathological processes of the nervous system are mediated by the substrate stiffness that the neurons suffer.However,how substrate stiffness regulates these processes remains to be studied.Cul-turing neurons on substrates with different stiffness in vitro is one of the best methods to study the role of stiffness in regulating neuronal development and activity.In this study,by changing the preparation time and the activation time of polyacrylamide gel,we provide an improved method that achieves a low toxic substrate environment for better primary neuron adhesion and development.Hope that this method is convenient for those studying the role of substrate stiffness in neurons.
查看更多>>摘要：Optical tweezers have elucidated numerous biological processes,particularly by enabling the precise manipulation and measurement of tension.One question concerns the biological relevance of these ex-periments and the generalizability of these experiments to wider biological systems.Here,we catego-rize the applicability of the information garnered from optical tweezers in two distinct categories:the direct relevance of tension in biological systems,and what experiments under tension can tell us about biological systems,while these systems do not reach the same tension as the experiment,still,these ar-tificial experimental systems reveal insights into the operations of biological machines and life processes.
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