How to use Glysite Scout Glycan Screening Kits

How to use Glysite Scout Glycan Screening Kits
Posted in: Tips and Tricks

Researchers like you are rapidly trying to advance their discoveries with a comprehensive view of glycan expression in their tissue samples. To help aid in these discoveries, Vector Laboratories recently released a brand-new product, GlysiteTM Scout Glycan Screening Kits, Immunofluorescence. Our curated lectin selection in these fully integrated kits with 3 fluorophore options enables the detection of all the major glycan motifs for the evaluation of glycan distribution in a target specimen. From biomarker discovery and validation to exploring differences in diseased and healthy tissue, these kits will help you transform your tissue insights.  

Curious how these kits work? This how-to blog post will show you how to use the Glysite Scout Glycan Screening Kit—regardless of which fluorophore your kit comes with. The post will walk you through everything from how to prepare and stain your slides through mounting your finished result. If you are a more visual learner, we have included a how-to video at the end so you can watch the protocol being performed. 

Kit components 

Glysite Scout Glycan Screening Kit, Immunofluorescence kits contain the following biotinylated lectins: 

  • AAL (Aleuria Aurantia) 
  • ECL, ECA (Erythrina Cristagalli) 
  • GNL (Galanthus Nivalis) 
  • Jacalin 
  • MAL II (Maackia Amurensis II) 
  • PHA-L (Phaseolus Vulgaris Leucoagglutinin) 
  • WFA, WFL (Wisteria Fluoribunda) 
  • WGA (Wheat Germ Agglutinin) 

In addition to the glycan binders, the kit includes optimized immunofluorescence reagents for glycan detection, including biotin, Carbo-Free, and streptavidin blocking solutions, 10x concentrate of DyLight™ streptavidin, and VECTASHIELD Vibrance® Antifade Mounting Medium with DAPI. 

Glysite™ Scout Glycan Screening Kit, Immunofluorescence.
Figure 1: Glysite™ Scout Glycan Screening Kit, Immunofluorescence.

Preparing your dilutions 

You will want to prepare dilutions of all your working solutions before starting the protocol. The dilutions are as follows: 

  • The Carbo-Free Blocking Solution, 10x Concentrate should be diluted to 1x in DI water. 
  • The biotinylated lectins are provided at 2 mg/ml and should be diluted to 2–10 μg/ml in PBS. You will need to determine what your optimal concentration should be for the target specimen. 
  • The DyLight streptavidin reagent is provided at 1 mg/ml and should be diluted to 10 μg/ml in PBS. 
Preparing lectins for staining.
Figure 2: Preparing lectins for staining.

Preparing your samples 

If you are using paraffin sections, you will need to deparaffinize and hydrate your tissue sections through xylenes or other clearing agents and graded alcohol series. 

If you are using frozen sections or cell preparations, you will need to fix your tissue sections with acetone or an appropriate fixative.  

Tip: Be sure to consider antigen retrieval for epitope unmasking. If it is required, perform this procedure using an Antigen Unmasking Solution, Citrate-based, pH 6.0 (H-3300) or Tris-based, pH 9.0 (H-3301). 

Tip: We recommend you use the ImmEdge® Hydrophobic Barrier PAP Pen to provide a heat-stable, water-repellent barrier that will keep your reagents localized on the tissue specimens and prevent mixing of reagents when multiple sections are mounted on the same slide. 

Blocking your samples 

Before blocking your samples, you will need to rinse for 5 minutes in tap water. 

If your specimen contains endogenous biotin, biotin receptors, or streptavidin binding sites, you will need to perform a streptavidin/biotin block. 

  1. Apply the Streptavidin Blocking Solution using the included dropper, enough to cover your tissues. Incubate for 15 minutes. 
  2. Remove the blocking solution and wash in buffer for 5 minutes. 
  3. Apply the Biotin Blocking Solution using the included dropper, enough to cover your tissues. Incubate for 15 minutes. 
  4. Wash in buffer for 5 minutes. 

Tip: When performing the wash steps, we recommend you tip off excess solution and give a quick rinse in buffer before placing your slides in the buffer jar for 5 minutes. 

After performing a streptavidin/biotin block (if necessary), you will need to block for non-specific binding.  

  1. Apply 1x Carbo-Free Blocking Solution, enough to cover your tissues. Incubate for 30 minutes. 
  2. Wash in buffer for 5 minutes. 

Tip: Other blocking solutions may contain glycoproteins that interfere with lectin binding, so we recommend using the Carbo-Free Blocking Solution included. 

Applying primary lectins 

  1. Apply your diluted biotinylated lectins, enough to cover your tissues. Incubate for 30 minutes. 
  2. Wash in buffer for 5 mins.  

Applying DyLight streptavidin reagent 

  1. Apply DyLight streptavidin reagent, enough to cover your tissues. Incubate for 30 minutes in the dark. 
  2. Wash in buffer for 5 mins. 

Tip: If you can, perform these steps in a dark room or without the lights on, if possible. If not, we recommend using a staining tray with a dark lid or covering your samples to reduce light exposure which can affect your fluorescence. 

Applying DyLight streptavidin in staining tray to preserve fluorescence.
Figure 3: Applying DyLight streptavidin in staining tray to preserve fluorescence.

Applying antifade mounting media and coverslipping 

  1. Apply VECTASHIELD Vibrance Antifade Mounting Medium with DAPI. Coverslip. 
  2. Place your mounted samples on a flat, dry surface in the dark and allow the media to cure. 

Tip: Tip off and dab away excess residual buffer before applying the mounting media to reduce the risk of bubbles under the coverslip. 

Tip: Apply small drop volumes of approximately 25 μl (per 22 mm x 22 mm coverslip) of your mounting media to reduce excess from seeping through the edges of the coverslip. 

Tip: Your slides can be viewed 30 minutes after mounting, but we recommend waiting at least 2 hours for optimal antifade performance to be achieved. 

We hope this protocol walkthrough was helpful so you can get started on using the Glysite Scout Screening Glycan Kits on your own and unlocking deeper insights with glycobiology. If you are a more visual learner, be sure to watch the video below on how to use glycan screening kits. For more information on how glycobiology can impact your research, check out the Glycobiology Resources page, and stay tuned for more tips and tricks on the blog. 

DyLight is a trademark of Pierce Biotechnology, Inc.

 
July 27, 2022
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