ALK-1 Lentiviral Activation Particles (h): sc-400728-LAC

ACVRL1 encodes activin receptor-like kinase 1 (ALK-1), a type I serine/threonine kinase receptor in the TGF-β/BMP superfamily that is highly active in endothelial cells. Upon ligand engagement with BMP9 or BMP10 and type II receptors, ALK-1 propagates signaling through SMAD1/5/8 to regulate transcriptional programs controlling angiogenic sprouting, vessel maturation, and endothelial quiescence. Crosstalk with ALK5/SMAD2/3 and inputs from VEGF and Notch pathways helps balance proliferative versus stabilizing cues during vascular remodeling. Dysregulated ACVRL1 signaling is linked to vascular malformation biology, including hereditary hemorrhagic telangiectasia, making it a key node for studying endothelial signaling dynamics and vascular homeostasis mechanisms.

ALK-1 Lentiviral Activation Particles (h) address this need by packaging the complete synergistic activation mediator (SAM) transcriptional activation system into transduction-ready, high-titer lentiviral particles, enabling efficient ACVRL1 upregulation across a broader range of human cell types.

ALK-1 Lentiviral Activation Particles (h) deliver all functional components of the synergistic activation mediator (SAM) system via lentiviral transduction. The system comprises three particle preparations co-transduced into target cells: one encoding catalytically inactive dCas9 (D10A and N863A mutations) fused to the VP64 transactivation domain with a blasticidin resistance gene; one encoding the MS2-p65-HSF1 fusion protein with a hygromycin resistance gene; and one encoding a target-specific 20 nt sgRNA fused to two MS2 RNA aptamers with a puromycin resistance gene. Following lentiviral transduction and genomic integration of the expression cassettes, the SAM components are stably expressed and assemble at the target locus within the proximal promoter region upstream of the ACVRL1 transcriptional start site, where VP64, p65, and HSF1 act cooperatively to recruit endogenous transcriptional machinery and drive sustained upregulation of endogenous ALK-1 expression. The use of nuclease-inactive dCas9 avoids the introduction of double-strand DNA breaks and preserves the native ACVRL1 genomic locus and regulatory architecture.

The lentiviral format offers several practical advantages: stable genomic integration supports heritable activation across cell divisions; high-titer particle preparations eliminate the need for in-house viral production; and compatibility with primary, non-dividing, and transfection-resistant cell types expands experimental accessibility. Successful transduction can be confirmed and enriched through triple antibiotic selection using puromycin, hygromycin, and blasticidin.

For Research Use Only. Not Intended for Diagnostic or Therapeutic Use.