Subcellomics Creative Proteomics

Exosomes Labeling and Tracking

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Exosomes, as naturally secreted extracellular vesicles (EVs), possess inherent high stability, biocompatibility, low immunogenicity, and targeted delivery, and play an important role in intercellular communication during pathological processes, and therefore have attracted much attention in the field of nanomedicine in recent years. These vesicles can be used as imaging biomarkers, therapeutic agents, and drug-delivery vehicles for disease diagnosis and treatment. To further advance the investigation and application of exosomes, accurate knowledge of their specific metabolic pathways in vitro and in vivo is required. Creative Proteomics is a leading provider of exosome research and analysis services with years of experience and state-of-the-art technology platforms. We have established exosome labeling and tracking platform that can effectively facilitate our customers' understanding of exosome behavior.

Ligand Discovery for Membrane Proteins

Exosome imaging techniques

Exosomes have attracted extensive scientific and clinical research interest due to their important functions in physiological and pathological conditions. Exosomes can transport a range of bioactive substances such as mRNA, miRNA and proteins to recipient cells and analysis of the molecular profiles of circulating exosomes may reveal potential biomarkers for noninvasive diagnosis and prognosis of the diseases. Furthermore, the unique set of advantages of exosomes promotes the potential of exosomes as drug-delivery vehicles for regenerative medicine, various cancer, and neurodegenerative diseases. Research and clinical translation of exosome-based approaches require a better understanding of their behavior. Exosome labeling and tracking strategies have been applied to study the function of exosomes in pathophysiological settings, typically using fluorescence microscopy followed by bioluminescence imaging (BLI), magnetic resonance imaging (MRI) and computed tomography (CT). Each of these imaging techniques has its own reporters, advantages, disadvantages, and specific application areas, which are summarized below.

Exosomes imaging techniques
Visualizing methodsReportersAdvantagesDisadvantagesApplications
Bioluminescence imaging (BLI)Gaussia-luciferase (Gluc)Excellent signal-to-noise ratio (SNR), High sensitivity, no need for excitation sourceA Labor-intensive procedure
Transient signal unable to track in the long term
Mainly to small animals
In vivo and ex vivo
Magnetic resonance imaging (MRI)SPIONs, USPIODeep penetration, high-quality 3D imaging of tissues with anatomical detailsLimited labeling efficiencyIn vivo
Computed tomography (CT)99mTc-HMPAO
High spatial and temporal resolutionLabeling purified exosomesIn vivo
Fluorescence labelingOrganic dyesStrong and long lasting fluorescence signal, multiple colors
Excellent spatial resolution
Staining other lipid entities and providing false positive signalIn vitro
Genetically encoded fluorescent proteinsMultidirectional exosomes transport among cellsThe signal depends on the oxygenation level in the tissuse
Limited labeling efficiency
In vitro and in vivo
Immunofluorescent reportersHigh specificityHigh costIn vitro
Fluorescent nanomaterialsExcellent optical properties, functionalization with targeting moietyTedious synthesis processIn vitro

Exosomes labeling and tracking at Creative Proteomics

Creative Proteomics has been working with exosome research and analysis for years. Our exosome labeling and tracking services are mainly based on fluorescence labeling and fluorescence microscopes (conventional confocal fluorescence microscopes, high-resolution fluorescence microscopes), electron microscopes (SEM and TEM), and flow cytometers. Our services are designed for in vitro visual analysis (isolated exosome samples) and can also help with in vivo validation of exosome tracing. We are committed to providing our customers with valuable information on the specific metabolic pathways of exosomes in vitro and in vivo, such as their release from parental cells, uptake by recipient cells, tissue distribution and body fluid levels.

Workflow of our services

Exosome extraction and purification

Exosome concentration determination

Exosome fluorescent labeling

Fluorescence exosome purification

Fluorescent exosome concentration labeling

Imaging observation

Detection cycle

15-20 working days after receiving the sample


Stained exosomes, basic experimental steps, pictures, and electronic archive report


  1. Shen, Li-Ming, Linglai Quan, and Jing Liu. "Tracking exosomes in vitro and in vivo to elucidate their physiological functions: implications for diagnostic and therapeutic nanocarriers." ACS Applied Nano Materials 1.6 (2018): 2438-2448.

* For Research Use Only. Not for use in diagnostic procedures.

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