System Biosciences

XStamp GE11 exosome EGFR targeting lentivector

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  • XStamp GE11 exosome EGFR targeting lentivector
  • XStamp GE11 exosome EGFR targeting lentivector


Target exosomes to cancer cells with the pre-built XStamp-GE11 Lentivector Construct (binds to cells expressing EGFR).
  • Display GE11 sequences on exosome surfaces
  • Target cancer cells
  • Create stable XStamp-GE11 cell lines



Putting exosomes to work: Target exosomes to brain cells Use exosomes to deliver protein, RNA, DNA, or small molecule cargo to brain cells with XStamp-BHP1. The patented XStamp technology is an optimized, exosome surface display system that efficiently places protein sequences on exosomal surfaces. The XStamp-BHP1 Lentivector fuses the BHP1 peptide to the XStamp tag, ensuring that exosomes display BHP1 on their outer surface. Exosomes made from cells transfected or transduced with the XStamp-BHP1 Lentivector will now be targeted to brain cells.
  • Display BHP1 sequences on exosome surfaces
  • Target brain cells
  • Create stable XStamp-BHP1 cell lines

SBI also offers a selection of pre-built targeting XStamp Lentivectors, as well as a clone-your-own XStamp Cloning and Expression Vector:

How It Works

Engineering exosomes with specific surface proteins

XStamp is based upon a C-terminal fusion of the C1C2 domain from the protein MFG-E8, which is targeted to the exosome surface. Protein sequences that are fused to the XStamp tag will efficiently display the protein ligand fusion on the surfaces of secreted exosomes.

Supporting Data

See XStamp targeting in action


Figure 1. XStamp with motilin specifically targets exosomes to GI cells. Motilin is a 22-amino acid polypeptide hormone that binds to the motilin receptor, which is exclusively expressed in the intestine. XStamp with motilin can be used to target exosomes to GI cells. METHODS: The XStamp-Motilin construct (Cat.# XSTP720PA-1) was transfected into HEK293 cells and after 48 hours, the exosomes were isoalted using ExoQuick-TC.

The next day, the XStamp-Motilin exosomes were Exo-Fected with a Texas-Red-labeled siRNA to monitor exosome docking and delivery. The transfected XStamp-Motilin exosomes were then added to MDA-MB-231 Breast Cancer Cells (motilin receptor negative) and to HT-29 Colon Cancer Cells (motilin receptor positive). The cells were imaged after 24 hours for uptake of the Texas-Red-labeled siRNA delivery from the XStamped exosomes. The HT-29 colon cancer cells that are motilin receptor positive took up the XStamp-Motilin exosomes at a much higher rate than the MDA-MB-231 Breast Cancer (motilin receptor negative) cells.




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