PEAR1 Knockout mlMCD-3 Cell Line

The PEAR1 Knockout mlMCD-3 Cell Line is a CRISPR/Cas9-edited knockout cell line featuring targeted disruption of the PEAR1 gene in a mouse lung microvascular endothelial cell background. This loss-of-function model provides a powerful tool for dissecting the molecular mechanisms underlying PEAR1-mediated signaling in endothelial biology and platelet function. By eliminating PEAR1 expression, researchers can interrogate its roles in vascular homeostasis, angiogenesis, and platelet?Cendothelial interactions. The cell line is generated using CRISPR/Cas9-mediated gene disruption, ensuring stable ablation of the target gene without introducing exogenous sequences, and is suitable for a wide range of functional and biochemical assays.

The host cell line, mlMCD-3, is an immortalized mouse lung microvascular endothelial cell model that retains key characteristics of primary pulmonary microvascular endothelium. These cells actively maintain vascular barrier integrity, regulate leukocyte trafficking, and mediate angiogenic responses, making them an ideal system for studying microvascular biology. Derived from mouse lung tissue, mlMCD-3 cells express endothelial markers and respond to vascular endothelial growth factor (VEGF), thrombin, and shear stress, mimicking in vivo endothelial behavior. Their robust growth and reproducible phenotype enable consistent experiments across multiple laboratories.

PEAR1 (Platelet Endothelial Aggregation Receptor 1) encodes a transmembrane receptor that plays a critical role in both platelet aggregation and endothelial cell biology. In platelets, PEAR1 mediates aggregation through homophilic interactions that activate downstream targets including SRC family kinases, PI3K, AKT, and integrin ??IIb??3, leading to thrombus formation. In endothelial cells, PEAR1 promotes cell migration and angiogenesis upon stimulation by upstream regulators such as collagen, thrombin, shear stress, and VEGF. Mechanistically, ligand engagement triggers SRC-mediated phosphorylation, recruiting adaptor proteins SHC1 and GRB2, and activating FAK, ERK1/2, and Rho GTPases. PEAR1 also intersects with PTPN11 and integrin ??3 to coordinate focal adhesion dynamics and cytoskeletal reorganization, ultimately influencing pathways such as PI3K-AKT, MAPK, and mTOR signaling.

In the context of lung microvascular endothelial cells, PEAR1 is well-positioned to regulate barrier function, leukocyte extravasation, and angiogenic sprouting. Loss of PEAR1 in mlMCD-3 cells permits systematic investigation of how this receptor contributes to endothelial integrity under basal and inflammatory conditions. By comparing wild-type and knockout cells, researchers can delineate PEAR1-dependent effects on permeability, migration, and tube formation, and assess its cross-talk with VEGFR2 and integrin-mediated pathways. This model is especially relevant for studying microvascular dysfunction in diseases such as acute lung injury, pulmonary hypertension, and cancer, where aberrant angiogenesis and barrier disruption are hallmarks.

The PEAR1 Knockout mlMCD-3 Cell Line is optimally suited for a breadth of functional and signaling analyses. Typical applications include angiogenesis research using tube formation and scratch wound migration assays, platelet?Cendothelial adhesion studies, and vascular permeability measurements. It also serves as a platform for anti-angiogenic drug screening, thrombosis modeling, and phospho-signaling analysis via Western blotting and flow cytometry. Expression profiling by RT-qPCR and immunofluorescence further enables mechanistic dissection of PEAR1-dependent transcriptional programs. Researchers interested in platelet biology and endothelial cell signaling will find this model invaluable. For additional details or to place an order, please contact Ascent Research.