Alexa Fluor 647-Labeled B7-H3/CD276 Fc Chimera: The "Far-Red Precision Locator" for Immune Microenvironment Analysis
Author: Senior Product Manager of UA Views：656 
Alexa Fluor 647-Labeled B7-H3/CD276 Fc Chimera is an advanced detection and functional analysis probe designed for high-dimensional, high-complexity tumor immunology research.
- Recent Advances
- Product Information
Recent Advances
Alexa Fluor 647-Labeled B7-H3/CD276 Fc Chimera is an advanced detection and functional analysis probe designed for high-dimensional, high-complexity tumor immunology research. Building upon its FITC-labeled predecessor, this version features critical spectral performance upgrades to address the core technical bottleneck in analyzing complex immune microenvironments—multicolor signal crosstalk. By combining B7-H3's targeting capability with the high-performance far-red fluorescent dye Alexa Fluor 647 and the versatile Fc Chimera platform, this probe provides researchers with a "far-red precision locator" for high-fidelity, independent detection of B7-H3 in ultra-high-parameter flow cytometry, multiplex tissue imaging, and dynamic functional studies. It is an essential tool for in-depth investigation of B7-H3's spatiotemporal dynamics in immune regulation and tumor progression.
1. Overview: Spectral Optimization and Platform Design
This protein represents the high-end spectral-optimized version in the B7-H3 detection tool series, with its design focused on achieving signal purity and detection flexibility in multiparameter complex systems.
B7-H3/CD276 Extracellular Domain Targeting Module
The core component is the extracellular domain of human B7-H3 protein, maintaining its original function to ensure high-specificity recognition of cell surface and soluble B7-H3 antigens, guaranteeing biological targeting accuracy.
Fc Chimera Structure
The retained B7-H3-Fc chimeric structure continues to leverage its platform advantages:
Ultimate Signal Flexibility: The Fc tag allows users to completely "decouple" B7-H3 detection from specific fluorescent channel binding. When the AF647 channel is occupied by experimental design, B7-H3 signals can be easily "migrated" to any other available channel (e.g., PE-Cy7, BV785) by switching to differently labeled secondary antibodies, providing unparalleled flexibility for designing ultra-high-dimensional flow or imaging panels with dozens of colors.
Stable Functional Manipulation Interface: Offers a reliable operational foundation for crosslinking-based functional studies and competitive binding assays.
Alexa Fluor 647 Fluorescent Label (Core Upgrade)
Replacing FITC with Alexa Fluor 647 is a strategic upgrade tailored for modern multicolor analysis platforms. AF647 emits far-red fluorescence when excited by 633 nm/640 nm lasers, offering revolutionary advantages:
Exceptional Spectral Isolation: Its emission peak (~668 nm) is nearly completely separated from those of commonly used dyes like FITC, PE, and PerCP-Cy5.5. In flow cytometry, this means minimal fluorescence spillover and simpler, more accurate compensation matrices, ensuring high-fidelity B7-H3 signals and quantitative precision.
High Brightness and Photostability: Brighter than traditional APC and more resistant to photobleaching, delivering strong and persistent signals suitable for long-term live-cell imaging, repeated confocal scans, and sensitive detection of low-expression samples.
Superior Tissue Imaging Performance: Far-red light suffers minimal interference from tissue autofluorescence, achieving better signal-to-noise ratios and penetration depth in thick tissue sections, organoids, or deep-layer imaging of原位 tumors.
Design Philosophy
This probe is a dedicated solution to the challenges of "big-data immune analysis." The B7-H3 domain is the content (target information); Alexa Fluor 647 is the independent, high-definition, interference-free transmission channel allocated for this critical information; and the Fc Chimera serves as the adaptive protocol ensuring optimal encoding and output across any "communication network" (experimental platform). The goal is to ensure B7-H3 data remains清晰 and error-free amidst today's most complex multi-omics "data deluge."
2. Core Mechanism: Pristine Signal Acquisition in Ultra-High-Dimensional Contexts
The probe's core value lies in its seamless,无损 integration into cutting-edge multiparameter analysis workflows.
1. Resolving Channel Conflicts in Ultra-High-Dimensional Flow Cytometry
Unlocking 30+ Color Flow Panels: In designing ultra-high-dimensional flow schemes for deep profiling of tumor-infiltrating immune cells or bone marrow microenvironments, the AF647 channel is a precious resource due to its clean spectral properties. AF647-B7-H3 allows perfect embedding of this critical parameter without sacrificing FITC, PE, or other core channels for other key markers, enabling truly comprehensive analysis.
Accurate Co-Expression and Exclusion Analysis: Enables easy and precise analysis of molecules co-expressed with or mutually exclusive to B7-H3, such as PD-L1, HLA-DR, or CD44, defining the immunophenotype and functional state of B7-H3+ cell populations without compensation纠缠.
2. Enhancing Complex Tissue Spatial Imaging Quality
Key Component of Multiplex Immunofluorescence/IHC: In spatial proteomics technologies like CODEX, PhenoCycler, or MIBI-TOF, or conventional multicolor fluorescence experiments, AF647 is a critical channel. This probe enables simultaneous原位 observation of B7-H3 expression on tumor cells, tumor-associated macrophages, cancer-associated fibroblasts, and vasculature, alongside precise spatial relationships with CD8+ T cells, Tregs, etc.
3D Tissue Imaging: In 3D confocal imaging of patient-derived organoids or tissues, AF647's far-red light effectively penetrates deeper structures, yielding more complete and clear Z-axis information.
3. High-Quality Tracing for Dynamic Functional Studies
Long-Term Live-Cell Interaction Imaging: Its exceptional photostability makes it ideal for time-lapse imaging to observe B7-H3's dynamic distribution during immune synapse formation or track the transfer of B7-H3-expressing extracellular vesicles.
High-Content Screening: In image-based high-content drug screening, AF647 labeling provides stable, high-contrast signals for automated analysis of drug effects on B7-H3 expression or localization.
3. Downstream Applications: Empowering Systems Immunology and Precision Therapy
This probe is particularly suited for cutting-edge research and translational medicine requiring integrated multi-level, multiparameter information.
1. Systems-Level Profiling of Tumor Immune Microenvironments
High-Dimensional Flow Cytometry for Deep Immune Atlas Construction: Combined with dozens of antibodies, enables unbiased comprehensive analysis of tumor-infiltrating immune cells. Precisely identifies B7-H3 expression patterns across subsets (e.g., myeloid-derived suppressor cells, M2 macrophages, regulatory dendritic cells) and quantifies its correlation with T cell exhaustion or dysfunction.
Spatial Multi-Omics Validation and Discovery: After obtaining single-cell transcriptomic data and inferring cell-cell communication networks, AF647-B7-H3 enables spatial protein validation to原位 confirm predicted B7-H3-mediated interactions, closing the loop between "computational prediction" and "spatial evidence."
2. Biomarker and Mechanistic Research for B7-H3-Targeted Therapies
Predictive Biomarker Exploration: Using high-dimensional analysis, evaluates not only tumor B7-H3 expression levels but also its cellular heterogeneity and spatial distribution patterns to identify composite biomarkers better predicting responses to B7-H3-targeted antibodies, ADCs, or CAR-Ts.
Mechanistic Elucidation of Combination Therapies: In preclinical models, studies how checkpoint inhibitors, chemotherapy, or radiotherapy affect B7-H3 dynamics on tumor and immune cells, clarifying associations with treatment sensitivity or resistance to rationally design combination strategies.
ADC Development and Evaluation: Accurately quantifies B7-H3 antigen density and uniformity across tumor models, leveraging the probe's functionality to assess drug internalization efficiency and antigen expression feedback regulation.
3. Mechanistic Research in Immune-Related Diseases
Autoimmune and Inflammatory Diseases: In rheumatoid arthritis synovium or multiple sclerosis brain lesions, multiplex spatial imaging precisely解析 B7-H3 expression profiles across inflammatory cells, stromal cells, and tissue-repairing cells to深入研究 its dual roles at different disease stages.
4. Future Outlook: Integrating Advanced Observation and Intelligent Analysis
As a future-oriented tool, its development will deeply integrate with the most advanced observation and computational paradigms in life sciences.
Seamless Fusion with Spectral and Mass Cytometry
Spectral Flow Cytometry: AF647 is a highly stable signal source for unmixing high-dimensional data, ensuring accurate B7-H3 resolution among dozens of parameters.
Imaging Mass Cytometry: Metal-tagged versions based on the same binding domain enable spectral-unlimited imaging mass cytometry for simultaneous原位 detection of 40+ protein markers, contextualizing B7-H3 expression within ultra-high-throughput spatial molecular backgrounds.
Live Imaging and Theranostic Exploration
Using AviTag (if available) or novel engineering strategies, develop B7-H3 probes labeled with near-infrared-II dyes for small-animal deep-tumor imaging, enabling real-time, noninvasive monitoring of B7-H3-targeted drug distribution, efficacy, and tumor microenvironment evolution.
AI-Driven Image Analysis and Model Construction
Leveraging high-quality, highly specific multichannel tissue images generated by AF647-B7-H3, train AI models (e.g., deep neural networks) to automatically quantify B7-H3 expression across cell types, calculate spatial co-localization indices, identify specific spatial niches, and correlate these features with patient genomic data and clinical outcomes to build digital pathology prognostic models.
Hub for Single-Cell Multi-Modal Omics Analysis
At the single-cell level, combine DNA-barcoded antibodies (using the same epitope) for CITE-seq to obtain transcriptome and surface proteome (including B7-H3) data, while using AF647 probes for flow sorting or validation, enabling cross-validation and deep integration of multi-dimensional data.
Summary
Alexa Fluor 647-Labeled B7-H3 Fc Chimera represents a critical step in the evolution of tumor immunology research tools from "functional implementation" to "system integration." Through meticulous spectral engineering, it positions the key immune checkpoint molecule B7-H3 in the far-red channel—the least interfered and most flexible zone of modern multicolor analysis technology. This empowers researchers to从容 and precisely capture full-dimensional B7-H3 information even when exploring the most complex biological systems, such as highly heterogeneous tumor immune microenvironments. From mapping high-dimensional immune cell functional atlases to deciphering combination therapy synergies; from spatially validating computational predictions to enabling AI-driven pathological diagnostics, this "far-red precision locator" has become an indispensable high-performance data acquisition terminal bridging fundamental immunological discoveries and clinical precision immunotherapy. Moving forward, it will continue serving as a benchmark tool, fostering deeper integration of multi-omics technologies in tumor immunology and providing enhanced observational capabilities to discover new therapeutic targets, optimize existing therapies, and ultimately realize personalized cancer treatment.
This article is reviewed and published by the technical expert team of UA
Disclaimer: This article partially utilizes artificial intelligence assistance in its creation. If any content involves copyright or intellectual property issues, please let us know and we promise to verify and remove it as soon as possible.
Purchase recombinant protein, choose Nanjing UA-Bio
UA protein focuses on providing various protein reagents, raw materials, and services required for drug research and development, cell therapy, gene therapy, and basic scientific research, including drug target proteins, immune checkpoint proteins, cytokines, tool enzymes, customized protein expression, and full-length transmembrane protein development. Youai is committed to providing customers with high-quality products and professional services, and building a High-tech Biological Enterprise with International Competitiveness.
Target proteins | membrane proteins | cytokines | enzymes | viral antigens | protein customization
Nanjing UA Biotechnology Co., Ltd. Email：order@ua-bio.com Phone：+86-25-56221161
Product Information
Link：
©2021-2026 all rights reserved UA Biotechnology Co.,Ltd.
Privacy Policy 
网站备案号 浙ICP备2022019033号-2 浙公网安备33010202004867号
Business license (three certificates in one) Tel：+86-25-56221161
E-mail：order@ua-bio.com
All products sold on this website shall not be used for clinical diagnosis or treatment of humans or animals, and shall only be used for non-medical purposes such as industrial or scientific research.
