XMIRXpress Cloning Lentivector

Clone-your-own—use the XMIRXpress Cloning Lentivector to create an XMIRXpress Lentivector with any miRNA

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XMIRXpress cloning lentivector with Xmotif

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Putting exosomes to work: Clone-your-own XMIRXpress Lentivector

Adding customization to our powerful XMIRXpress Lentivector System, SBI offers a linearized, ready-for-ligation version of the XMIRXpress Lentivector that does not contain coding sequence for an miRNA, so you can clone your own miRNA into the lentivector. Simply design two DNA oligos for the top and bottom strand, anneal the top and bottom oligos, and ligate directly into the XMIRXpress Cloning Lentivector.

Create stable cell lines that produce exosomes carrying your miRNA-of-interest and then use those exosomes to deliver that miRNA to target cells. Don’t forget that we also have a series of pre-built XMIRXpress Lentivectors for even easier miRNA-containing exosome production.

The XMIRXpress Cloning Lentivector and an example showing cloning of miR-29b

All XMIRXpress Lentivectors feature an EF1a-GFP-Puro selection cassette and a downstream H1 promoter expressing the XMIR + XMotif cassette.

  • Flexible—turn the cell line of your choice into a factory that produces miRNA-packed exosomes
  • Powerful—great for a range of applications, including:
    • Modulating expression of miRNA-targets in recipient cells
    • Developing exosome-delivered miRNA-based therapies

How It Works

miRNA packaging into exosomes with XMIRXpress

Generating exosomes with specific miRNAs using XMIRXpress

Like XMIR and AXMIR, XMIRXpress packaging relies on an RNA sequence tag—the XMotif (identified and optimized by SBI)—that targets small RNAs to exosomes for packaging. By expressing an miRNA-XMotif cassette from an H1 promoter, you can generate miRNAs that are packaged into exosomes. After creating a stable cell line with your XMIRXpress Lentivector, you can continuously isolate exosomes containing your miRNA.

Supporting Data

The XMotif in XMIRXpress directs miRNAs to exosomes

Exosomes isolated from cells transfected with the XMIRXpress Lentivector miR-29b only contain packaged XMIRXpress-miR-29b miRNA if the lentivector contains a functional XMotif.

The XMotif in XMIRXpress directs miRNAs to exosomes

Figure 1. The XMotif in XMIRXpress directs miRNAs to exosomes. METHODS: The XMIRXpress-miR-29b Lentivector was transfected into HEK293 cells cultured in DMEM media with Exo-FBS (exosome-depleted FBS) in place of standard FBS to avoid contaminating bovine exosomes. HEK293 exosomes were collected after 48 hours. The exosomal RNA was purified and converted into qPCR-compatible cDNA. Relative amounts of XMIRXpress-miR-29b miRNA packaged into exosomes from the XMIRXpress-miR-29b lentivector were quantitated by qPCR with miR-16 used as a reference exosome control signal. The ΔΔCt calculation for XMIRXpress-miR-29b miRNA is shown in the bar graph.