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Sphäroide

Application of spheroids for cancer research and drug screening

What are spheroids?

Spheroids are three-dimensional (3D) cell models that mimic the characteristics of cell aggregates such as microtumors. In recent years, there has been significant progress in development of in vitro aggregates of tumor cells for use as models for in vivo tissue environments. Wenn diese Aggregate in ein Well einer Platte mit Rundboden und äußerst geringer Bindung ausgesät werden, bilden sie jeweils ein separates Sphäroid.

Von Sphäroiden wird angenommen, dass sie das Verhalten von Tumoren wirksamer nachahmen als reguläre zweidimensionale (2D)-Kulturen. Der Grund ist, dass sie, wie Tumore, sowohl an der Oberfläche exponierte als auch tief verborgene Zellen, proliferierende und nicht-proliferierende Zellen, ein sauerstoffarmes Zentrum und eine gut mit Sauerstoff angereicherte äußere Zellschicht enthalten. Such 3D spheroid models are being successfully used in screening environments for better assessment of drug safety and identifying potential cancer therapeutics.

Z-stack going through a 250 µm depth of a spheroid. We are able to see cells in the center of the spheroid at this depth due to our specialized deep-tissue penetrating, confocal disk module.

The application of spheroids for cancer research and drug screening

One of the most significant objectives in cancer research is to understand tumor cell formation. Compared to 2D cell cultures, spheroids mimic solid tumors much more accurately. They help display the physiological changes that differentiate tumor cells from healthy cells. Multicellular tumor spheroid models give deeper insights into the tumor microenvironment, allowing researchers to visualize cell-to-cell interactions, how tumor cells absorb nutrients, and how they proliferate.

Spheroids are also ideal for preclinical drug screening and validation when monitoring cellular responses to therapeutic interventions. Specifically, they can reveal the tumor infiltration capacity (or incapacity) of drugs, as well as their inhibitory effects on metastasis.

Stem cell research is another significant application of spheroids, especially during the cultivation of embryonic (ESC) and neural stem cells (NSC). Recently, researchers cultured mesenchymal stem cells (MSCs) in spheroids and proved their regenerative and anti-inflammatory effects, which depicts potential for regenerative medicine and cell-based therapies.

Compared to other 3D cell culture methods, spheroids offer several advantages, including relevance to tumor biology, lower cost, less labor than animal models, reproducibility, ease of integration into high-throughput screening, and advanced imaging techniques.

Workflow for analyzing 3D spheroids for high-throughput screening

Imaging and analysis of spheroids are crucial to understanding the formation and behavior of tumor microenvironments. It can also aid in obtaining more insightful and realistic data from anti-cancer drug screening. Here we developed and optimized methods for the formation of 3D spheroids, as well as confocal imaging and analysis methods for high-throughput screening.

 

 

Sphäroide können in 96- or 384-Well-Platten gezüchtet, mit Verbindungen behandelt und mit Farbstoffen gefärbt werden, die aktive zelluläre Prozesse und Signalwege sichtbar machen. In some cases, spheroids can be imaged without washing. They may also be fixed if desired.
 

  1. Culture spheroids – Cancer cells can be cultured directly in an ultra-low attachment (ULA), round bottom plate, or other labware to develop the typical morphology of a spheroid. Andere Kultivierungsplatten ermöglichen es, mehrere Sphäroide in einem einzigen Well wachsen zu lassen.
     

  2. Treat with compounds – After spheroid formation, compounds at the desired concentrations are added into the wells, and then incubated for one to several days, depending on the mechanism being studied.
     

  3. Stain for markers – After compound treatment is complete, stains are added directly to the media. Um eine Störung der Sphäroide zu vermeiden, können Färbungen angewendet werden, die keinen Waschschritt erfordern. Sphäroide können, wenn notwendig, jedoch auch vorsichtig gewaschen werden, sogar automatisiert.
     

  4. Acquire spheroid images – Images within the body of the spheroid can be captured individually or as a Z-stack (multiple images taken at differing depths) using specialized imaging equipment.
     

  5. Analyze cancer cells – Use cellular imaging analysis software to run quantitative analysis of the cell images to monitor the expression of different markers and to quantify biological readouts.

Application and assays

Cutting-edge 3D imaging and analysis methods are crucial to characterize, reproduce, and monitor spheroids. Such an intricate workflow can benefit greatly from high-content imaging and image analysis software. Learn more about our methods for spheroid research from the resources below.

Resources of Spheroids

Videos und Webinare

Capturing the Complexity of Cell Biology

Anwendung neuronaler 3D-Späroide in der Wirkstoffforschung

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