imaging immunostained colorectal cancer&#45;derived organoids in peptide hydrogel for evaluating the effects of self&#45;assembling peptides on cell adhesion

सेल आसंजन और आकृति विज्ञान के लिए बायोफंक्शनल स्व-संयोजन पेप्टाइड्स का मूल्यांकन

In recent years, self-assembling peptides (SAPs) have emerged as promising biomaterials for tissue engineering applications. SAPs possess unique properties, including spontaneous formation of nanofibers, biocompatibility, biodegradability, and non-immunogenicity, making them attractive candidates for scaffold development1. SAPs have been previously used together with various types of cells, and notably, reported ultrashort SAPs have facilitated the encapsulation of stem cells while upholding their pluripotency over prolonged periods encompassing more than 30 passages and with minimal incidence of chromosomal aberrations2,3,4. Hence, adapting SAPs for their use in organoid culture constituted a rational subsequent step.
Organoids are complex three-dimensional structures that arise from single pluripotent cells. These structures give rise to various cell types, which then self-organize to replicate the developmental processes of embryonic and tissue growth in vitro5. This innovative framework has evolved into a formidable tool for in vitro investigations, efficiently conserving the genetic, phenotypic, and behavioral attributes characteristic of in vivo organs6. Nevertheless, a principal impediment in the bench-to-bedside transition of organoid-based findings is the need for reproducibility7. This variation in results is primarily ascribed to the difficulty in fully differentiating human pluripotent stem cells into specialized cell lineages, compounded by the absence of authentic tissue architecture and the inherent complexity encountered in organoid models. Given the rise in popularity of stem-cell- and organoid-based studies8, there has been an escalated demand for biomaterials with dynamic mechanical properties and integrin-like adhesion sites or scaffolds with controlled degradability7,9. These attributes can be effectively tuned through the strategic utilization of biofunctionalized SAPs.
SAPs are short sequences of amino acids with the inherent ability to spontaneously organize into well-defined structures10. These peptides often contain alternating hydrophobic and hydrophilic residues, which drive their self-assembly through non-covalent interactions, including hydrogen bonding, electrostatic interactions, and hydrophobic effects11,12. The self-assembly process of these peptides is primarily driven by the need to minimize the system&#39;s free energy. When in an aqueous environment, the hydrophobic residues tend to cluster together to minimize their exposure to water, while the hydrophilic residues interact with the surrounding water molecules. This phenomenon leads to the formation of various nanostructures. In this case, ultrashort self-assembling peptides form nanofibers with characteristics that depend on the peptide sequence and environmental conditions2,12,13,14,15,16. These peptides adopt a &#946;-turn conformation, where individual peptide strands align parallel or antiparallel to each other, stabilized by hydrogen bonds (Figure 1). The presence of positive ions accelerates the self-assembling processes that lead to nanofiber formation.
Peptide nanofibers have been identified as possessing an innate ability to entrap significant volumes of water. This characteristic facilitates the generation of a hydrogel, which subsequently manifests as a biocompatible and biodegradable three-dimensional space conducive to cellular proliferation and growth. These self-assembling peptide nanofibers intricately emulate the topographical features inherent to the natural extracellular matrix (ECM) environment1. This resemblance endows cells with an environment that imitates their physiological habitat, further promoting optimal cellular activities17. Furthermore, the versatility inherent to these peptides permits a considerable degree of tunability4. Such adaptability enables changes to the matrix&#39;s properties, such as stiffness, gelation kinetics, and porosity. These adaptations are achieved through modifications to the peptide sequence. Consequently, self-assembling peptides (SAPs) have emerged as pivotal components in contemporary biomaterial science, extensively used as scaffolds for tissue regeneration and cellular culture13,17.
One of the critical advantages of self-assembling peptides is their ability to be easily synthesized and modified at the molecular level. This advantage allows for the incorporation of specific functional groups or bioactive motifs into the peptide sequence, enabling the design of peptides with tailored properties and functionalities18,19,20 (Figure 1B). For example, biofunctionalized SAPs can be designed to mimic the ECM and promote differentiation using the RGD peptide19,21. Peptide Ben-IKVAV has also been reported to significantly increase the expression of neuronal-specific markers due to its ligand-specific motiety22. These peptides can also be engineered to display bioactive molecules, such as integrin-binding peptides, to enhance cell survival23. Finally, other biofunctionalized SAPs have been developed to promote angiogenesis by including the IKVAV and YIGSR motifs in their structures24.
Biofunctionalized SAPs reported in an earlier publication show that self-assembling can be further modified by including the na&#239;ve peptide from which the biofunctionalized SAP was derived25. These SAP mixtures can also provide a wide array of SAP formulations that vary in their biochemical activity and physicochemical properties. For instance, the amphiphilic peptide IIFK is an ultrashort SAP that can withstand biofunctionalization with various motifs, exemplified by the incorporation of the IKVAV motif (Figure 1B). Both peptides can form nanofibers, both alone and combined. Each formulation results in hydrogels with varying physical properties (Figure 2)
However, because of the extensive array of potential permutations and alternatives obtained from the biofunctionalization of SAPs, there is a need to provide a fast and cost-effective option for organoid testing. One candidate for such intensive and cost-effective organoid evaluation is the SW1222 cell line, derived from human colorectal adenocarcinoma26,27. SW1222 cells possess characteristics that enable their aggregation into 3D structures resembling organoids, making them an ideal model for studying tissue development and regenerative medicine applications. SW1222 cells have been identified as capable of generating organoids owing to their intrinsic overexpression of the LGR5 gene27. The creation of organoids from individual LGR5+ stem cells has been convincingly exhibited before, as well as the propensity of SW1222 cells to achieve morphological characteristics of a colorectal cancer organoid28.
In this methods paper, we present detailed protocols for evaluating and characterizing the effects of various biofunctional peptides on cell adhesion and lumen formation using SW1222 cells (Figure 3). By providing step-by-step procedures and imaging analysis methods, we hope to offer valuable insights into the biofabrication of organoids and the evaluation of simplistic SAP matrices for organoid culture.

लेखक स्पॉटलाइट: कोलोरेक्टल कैंसर ऑर्गेनोइड के लिए अल्ट्राशॉर्ट पेप्टाइड मैट्रिसेस का अनुकूलन

अल्ट्राशॉर्ट सेल्फ-असेंबलिंग पेप्टाइड मैट्रिक्स में SW1222 सेल लाइन से कोलोरेक्टल कैंसर ऑर्गेनोइड का निर्माण और लक्षण वर्णन

Our research aims to evaluate ultrashort self-assembling peptides as matrices for Colorectal Cancer Organoid Cultures. We address questions about organoid morphology, for viability, proliferation, and the adhesion and the impact of biofunctionalization. The goal is to optimize peptide matrix compositions for effective organoid growth, and to contribute to regenerative medicine.Cutting-edge technologies in our field involve 3D bioprinting for precise organic fabrication, microfluidic platforms for dynamic culture environments, and advanced imaging tools like atomic force microscopy and multiphoton microscopy. CRISPR-Cas9 gene editing refines genetic modification, while single cell RNA sequencing provides in-depth molecular insights. Current experimental challenges include enhancing organoid reproducability, refining vascularization for larger constructs, and mimicking complex tissue architecture.Overcoming these limitations in long-term culture and incorporating immune components into models are active areas. Achieving standardized protocols and addressing ethical concerns opposing ongoing challenges in this field. Significant findings in our field include demonstrating the suitability of ultrashort self-assembling peptides for organoid cultures.We have shown the versatility, reproducability, and stability of these peptides, providing a platform for fine tuning micro-environments. This contributes to advancing organoid-based studies, regenerative medicine, and biofunctionalized hydrogel research. Our protocol bridges and research gap, whereby providing a systematic approach to evaluating organoids in ultrashort self-assembling peptide matrices.It addresses the need for standardized methods in assessing cell behavior within these matrices, aiding in durational design of peptide-based hydrogels for optimal organoid growth and advancing regenerative medicine studies.

सेल आसंजन पर स्व-संयोजन पेप्टाइड्स के प्रभावों का मूल्यांकन करने के लिए पेप्टाइड हाइड्रोजेल में इमेजिंग इम्यूनोस्टेन्ड कोलोरेक्टल कैंसर-व्युत्पन्न ऑर्गेनोइड

शुरू करने के लिए, 10x पर एक epifluorescence माइक्रोस्कोप के साथ सना हुआ SW1222-व्युत्पन्न organoid नमूनों छवि. केवल रोड और डीएपीआई चैनलों का उपयोग करें। ImageJ सॉफ्टवेयर लॉन्च करें और प्लगइन पर क्लिक करें, उसके बाद मैक्रोज़।फिर ImageJ ROI कनवर्टर चलाने के लिए दौड़ें। py फ़ाइल सेल पोज़ GitHub साइट से। जब एक विंडो दिखाई देती है, तो कोलन ऑर्गेनॉइड फ़ोल्डर से पहली फ़ाइल का चयन करें और ओपन पर क्लिक करें।फिर सेग चुनें। पहली फ़ाइल के अनुरूप NPY फ़ाइल, और क्लिक करें खुला हुआ. इसके बाद, ROI प्रबंधक विंडो में सभी का चयन करें दबाएं और माप दबाएं।अब, फाइल पर क्लिक करें, इसके बाद परिणाम विंडो पर इस रूप में सहेजें परिणाम विंडो पर परिणाम सहेजें परिणाम को बचाने के लिए। बृहदान्त्र organoid लुमेन के लिए फ़ोल्डर में एक ही छवि के लिए छवि रूपांतरण दोहराएँ. फिर, ओरिजिन प्रो सॉफ्टवेयर लोड करें, डेटा पर क्लिक करें, इसके बाद आयात विज़ार्ड का पता लगाने के लिए आयात फ़ाइल पर क्लिक करें।एक ही छवि के लिए ऑर्गेनॉइड और लुमेन के आकार के गुणों के अनुरूप सीएसवी फाइलों का चयन करें। प्रत्येक लुमेन माप को उसकी संबंधित कॉलोनी के साथ जोड़ने के लिए कॉलोनी परिणाम कॉलम में लुमेन के आकार के गुणों की प्रतिलिपि बनाएँ। एक नए कॉलम में, लुमेन और कॉलोनी के क्षेत्रों को विभाजित करने के लिए इसकी संबंधित कॉलोनी के सापेक्ष लुमेन क्षेत्र का उत्पादन करें।प्रत्येक कॉलोनी और लुमेन क्षेत्र के परिपत्र के अनुरूप स्तंभ का चयन करें. फिर, क्रमिक रूप से प्लॉट, बेसिक 2 डी और स्कैटर पर क्लिक करें। प्लॉट विंडो पर राइट क्लिक करें और प्लॉट विवरण चुनें।सेंट्रोइड प्रो टैब पर क्लिक करें और सबसेट के लिए शो सेंट्रोइड पॉइंट पढ़ने के विकल्पों का चयन करें, डेटा बिंदुओं से कनेक्ट करें और दीर्घवृत्त दिखाएं। 2 डी में सुसंस्कृत कोशिकाओं कॉलोनी परिपत्र में एक बहुत ही उच्च भिन्नता थी. मैट्रिगेल में सुसंस्कृत कोशिकाओं में लुमेन के सापेक्ष आकार के लिए अधिक व्यापक वितरण था।

imaging-immunostained-colorectal-cancerderived-organoids-peptide

Research

JoVE Journal

Bioengineering

Imaging Immunostained Colorectal Cancer&#45;Derived Organoids in Peptide Hydrogel for Evaluating the Effects of Self&#45;Assembling Peptides on Cell Adhesion

Fabrication and Characterization of Colorectal Cancer Organoids from SW1222 Cell Line in Ultrashort Self&#45;Assembling Peptide Matrix

Ultrashort self-assembling peptides (SAPs) can spontaneously form nanofibers that resemble the extracellular matrix. These fibers allow the formation of ...