{"title":"Direct Reprogramming of Human Fibroblasts into Fully Functional Trophoblast Stem Cells.","authors":"Meir Azagury, Yosef Buganim","doi":"10.1007/7651_2025_648","DOIUrl":"https://doi.org/10.1007/7651_2025_648","url":null,"abstract":"<p><p>Trophoblast stem cells (TSCs), equivalent to first-trimester cytotrophoblasts, serve as valuable models for studying placental diseases and understanding early embryogenesis. Recent studies have demonstrated that human-induced trophoblast stem cells (hiTSCs) can be generated either by overexpressing the pluripotency factors OCT4, SOX2, KLF4, and MYC (OSKM) in fibroblasts or through the transdifferentiation of pluripotent stem cells. In this chapter, we describe a methodology for directly converting fibroblasts into fully functional hiTSCs using the transcription factors GATA3, OCT4, KLF4, and MYC (GOKM). This approach circumvents the need for inducing full pluripotency and avoids the expression of pluripotency factors per se. Moreover, the GOKM method seems to be superior technique, as it yields high number of colonies and a transcriptomic profile closely resembling blastocyst/first trimester-derived TSCs.</p>","PeriodicalId":18490,"journal":{"name":"Methods in molecular biology","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144094180","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Aslı Ak, Dorian Luijkx, Daniel Carvalho, Stefan Giselbrecht, Ron van Golde, Erik Vrij
{"title":"Microfluidic On-Chip Assay for Quantifying Blastoid Adhesion to Endometrial Epithelium.","authors":"Aslı Ak, Dorian Luijkx, Daniel Carvalho, Stefan Giselbrecht, Ron van Golde, Erik Vrij","doi":"10.1007/7651_2025_645","DOIUrl":"https://doi.org/10.1007/7651_2025_645","url":null,"abstract":"<p><p>The ability of the endometrium to accept and support embryo implantation is crucial, but factors influencing this process remain elusive. This method aims to obtain precise quantitative information on factors causally affecting the initial stages of embryo implantation. We developed a personalized implantation-on-chip platform using in vitro models of the endometrium (organoids) and the embryo (blastoids) to quantify functional embryo attachment. Here, we describe a microfluidic platform for precisely assessing functional receptivity of endometrial epithelium through blastoid adhesion. Endometrial organoids were expanded and transformed into epithelial monolayers within custom-made microfluidic chips. These chips were then infused with large numbers of blastoids (>100) per chip. Followed after 48 h of co-culture, blastoids were exposed to a controlled stepwise increasing flow rate (50, 100 and 400 μL/min), while the rate of adhered blastoids was precisely measured from image-based readouts. Our method offers a robust platform for studying endometrial epithelial receptivity and testing therapeutic interventions with potential impact for infertile patients.</p>","PeriodicalId":18490,"journal":{"name":"Methods in molecular biology","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144078791","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Nathalia de Lima E Martins Lara, Anja Elsenhans, Ina Dobrinski
{"title":"Testicular Organoid Formation in Microwell Culture.","authors":"Nathalia de Lima E Martins Lara, Anja Elsenhans, Ina Dobrinski","doi":"10.1007/7651_2025_624","DOIUrl":"https://doi.org/10.1007/7651_2025_624","url":null,"abstract":"<p><p>Testicular organoids present an exciting 3D in vitro platform to bridge the gap between 2D culture and animal models in male reproduction research, allowing studies on testicular cell-cell interactions, morphogenesis, development, and the spermatogonial stem cell microenvironment in conditions that are more physiologically relevant. Therefore, research with testicular organoids offers opportunities for fertility preservation, disease modeling, and high throughput reproductive toxicity screening. Our laboratory has developed a simple and reproducible protocol using microwell plates, which facilitate the aggregation of single cells and promote the generation of thousands of homogenous organoids that recapitulate testicular cytoarchitecture and functions. In this protocol, a testicular cell suspension is obtained by enzymatic digestion of immature testes and centrifuged into pyramid-shaped microwells, where cells will aggregate and form organoids after a few days in culture. Here we detail our standard protocol for the generation of porcine testicular organoids, which can also be applied to other mammalian species.</p>","PeriodicalId":18490,"journal":{"name":"Methods in molecular biology","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143730742","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Organoid-Immune Cell Co-culture for Stable Live Imaging.","authors":"Nathalia Ferreira, Frauke Alves, Andrea Markus","doi":"10.1007/7651_2025_627","DOIUrl":"https://doi.org/10.1007/7651_2025_627","url":null,"abstract":"<p><p>Patient-derived organoids (PDOs) have emerged as a promising model for personalized drug testing. Generated from human tumor samples, PDOs effectively recapitulate the genetic and phenotypic heterogeneity of patient tumors, making them an ideal ex vivo platform for studying therapeutic responses, particularly to chemotherapies. However, their lack of components of the immune system limits their use in immunotherapy testing. The following protocol facilitates the co-culture of PDOs from tumor tissue with HLA-matched peripheral blood mononuclear cells (PBMCs) in a fixed Z-plane for stable live-cell imaging. This three-dimensional co-culture method represents a significant advancement in enabling real-time assessment of immunotherapeutic effects on tumor-derived PDOs by live cell imaging.</p>","PeriodicalId":18490,"journal":{"name":"Methods in molecular biology","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143730741","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Lisa Marie Stasch, Maja Buchholzki, Zehra Sevindik, Bettina Budeus, Diana Klein
{"title":"Matrix-Free Normal Human Epithelial-Fibroblast 3D Spheroid Cultures for In Vitro Lung Modeling.","authors":"Lisa Marie Stasch, Maja Buchholzki, Zehra Sevindik, Bettina Budeus, Diana Klein","doi":"10.1007/7651_2025_622","DOIUrl":"https://doi.org/10.1007/7651_2025_622","url":null,"abstract":"<p><p>The cellular responses of classical 2D flat monolayer cell culture systems provide only very limited reliable predictions about possible outcomes of corresponding animal experiments and clinical studies, which is due, among other things, to the lack of (bi)directional signaling transmission between different cell types and the lack of a structural microenvironment. To study the interactive communication between different cell types in vitro, two main co-culture methods have emerged as central techniques. In the indirect co-culture method, different cells are cultured physically separately (e.g., using transwell inserts) but can communicate with each other via secreted factors (paracrine mechanism). In the direct co-culture method, the different cells have direct physical contact, which enables direct interactions. Regarding the latter method, the cultivation of cells as spherical cell aggregates, so-called spheroids, embedded in a semi-solid extracellular matrix has been established as an in vivo-related, more complex cell culture model with different functional cell states according to cell-cell and cell-ECM interactions as well as oxygen and nutrient gradients. Here, we present a matrix-free method for direct spheroidal co-cultivation of human bronchial epithelial cells and fibroblasts, which can be considered as an in vivo-approximated cultivation method, especially with regard to the cellular composition of the respective spheroids.</p>","PeriodicalId":18490,"journal":{"name":"Methods in molecular biology","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143663697","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Bettina Budeus, Chiara Kroepel, Lisa Marie Stasch, Diana Klein
{"title":"Free-Floating Human Lung Organoids Derived from Induced Pluripotent Stem Cells.","authors":"Bettina Budeus, Chiara Kroepel, Lisa Marie Stasch, Diana Klein","doi":"10.1007/7651_2025_621","DOIUrl":"https://doi.org/10.1007/7651_2025_621","url":null,"abstract":"<p><p>Lung diseases are one of the leading causes of death worldwide, and the global burden of these respiratory diseases continues to increase. Therefore, there is a need for accurate models for basic and translational research. In addition to animal models, the development of alternative in vitro model systems is progressing rapidly, ranging from advanced lung cell cultures to complex tissue-engineered lungs. Human lung organoids have become easily transferable three-dimensional in vitro model systems for lung disease modeling. Here, we present a detailed protocol for a rather simple and therefore very practical but reliable method to generate lung organoids from induced pluripotent stem cells (iPSCs) without relying on a matrix, which would represent a step forward toward animal-origin and/or component-free in vitro modeling.</p>","PeriodicalId":18490,"journal":{"name":"Methods in molecular biology","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143663693","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Spheroid Invasion Assay of Melanoma Cells by Hanging Drop Technique.","authors":"Asiye Busra Boz Er, Ceren Sumer","doi":"10.1007/7651_2025_615","DOIUrl":"https://doi.org/10.1007/7651_2025_615","url":null,"abstract":"<p><p>The development of more physiologically relevant cancer models has led to the increased adoption of three-dimensional (3D) cell culture systems, such as tumor spheroids, which more accurately replicate the complex tumor microenvironment compared to traditional two-dimensional (2D) cultures. This study utilizes the hanging drop technique to generate melanoma spheroids from A375 and SK-MEL28 cell lines, including both parental and drug-resistant variants. These spheroids were embedded in Matrigel and treated with vemurafenib, cilengitide, or their combination to evaluate the effects on invasion. The combination therapy significantly reduced invasion, particularly in resistant SK-MEL28 spheroids. These findings underscore the importance of 3D spheroid models in studying drug efficacy and resistance mechanisms in cancer.</p>","PeriodicalId":18490,"journal":{"name":"Methods in molecular biology","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143663740","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Florian Hermans, Hugo Vankelecom, Annelies Bronckaers, Ivo Lambrichts
{"title":"Establishment of 3D Tooth Organoid Culture from Early-Postnatal Mouse Molar and Incisor.","authors":"Florian Hermans, Hugo Vankelecom, Annelies Bronckaers, Ivo Lambrichts","doi":"10.1007/7651_2025_623","DOIUrl":"https://doi.org/10.1007/7651_2025_623","url":null,"abstract":"<p><p>Organoid models are a powerful 3D stem cell technology to explore tissue (patho-)biology and development. Tissue-derived (i.e., from tissue biopsies) organoids are long-term and stably expandable while more closely recapitulating key phenotypical and functional characteristics of the tissue-of-origin than traditional 2D culture systems. Additionally, organoids can differentiate into tissue-specific cell types, for instance, following exposure to defined differentiation cues. Although prevailing in vitro cell models have deepened our understanding of mouse tooth development and biology, in vitro representations of the dental epithelium lack (the combination of) these benefits of tissue-derived organoids and are at most derived from one tooth type. Here, we describe the protocol to establish, propagate, and differentiate mouse tooth organoids from both early postnatal molar and incisor teeth. The established organoids display a dental epithelial stemness phenotype and acquire a maturation-stage ameloblast-like phenotype following differentiation.</p>","PeriodicalId":18490,"journal":{"name":"Methods in molecular biology","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143663719","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Phumuzile Dube, Bernice Monchusi, Mutsa M Takundwa, Vanelle L Kenmogne, Austin Malise, Deepak B Thimiri Govinda Raj
{"title":"Methodology for Assessing Drug Efficacy: Protocol for Single and Combination Drug Screening Using HeLa Cell Cultures.","authors":"Phumuzile Dube, Bernice Monchusi, Mutsa M Takundwa, Vanelle L Kenmogne, Austin Malise, Deepak B Thimiri Govinda Raj","doi":"10.1007/7651_2025_605","DOIUrl":"https://doi.org/10.1007/7651_2025_605","url":null,"abstract":"<p><p>This protocol outlines a detailed method for performing drug sensitivity testing (DST) on HeLa cells, focusing on both single-drug and combination-drug screening to assess cell viability. DST is integral to cancer research and functional precision medicine, providing insight into individual drug responses and facilitating the optimization of drug combinations. The protocol includes preparing and maintaining HeLa cell cultures, seeding in 96-well plates, and performing single and combination drug treatments using a low-throughput screening approach. These drug treatments aim to evaluate therapeutic effectiveness, enhance understanding of synergistic interactions, and identify optimal combinations that could minimize toxicity while overcoming resistance. Data analysis uses open-source tools, including the BREEZE pipeline and Synergy-Finder, allowing for precise analysis of cell viability and drug interactions. This protocol provides a robust, reproducible framework for DST in cancer research, applicable to other cell lines, patient samples, and various drug types/classes. The critical role of DST in improving clinical treatment strategies through precise, scalable drug response analysis is demonstrated.</p>","PeriodicalId":18490,"journal":{"name":"Methods in molecular biology","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143663736","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Deep Learning-Driven Computational Approaches for Studying Intrinsically Disordered Regions in S100-A9.","authors":"Gionathan L Distefano, Fabio D'Amico","doi":"10.1007/7651_2025_617","DOIUrl":"https://doi.org/10.1007/7651_2025_617","url":null,"abstract":"<p><p>Intrinsically disordered regions (IDRs) are flexible protein regions and lack a fixed three-dimensional structure, which makes them difficult to study using traditional structural methods. However, artificial intelligence can be helpful in predicting, analyzing, and modeling these regions. This chapter provides a simple protocol for a preliminary-level approach to identifying protein IDRs. By reporting on the S100-A9 protein as a case study example, characterization of the IDRs of this molecule could provide further details on the complex molecular interactions involved in psoriasis, particularly those related to inflammation, immune dysregulation, and keratinocyte behavior.</p>","PeriodicalId":18490,"journal":{"name":"Methods in molecular biology","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143663473","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}