The exogenous promoter and chimeric ADAM9 coding sequence containing human extracellular domain, mouse transmembrane domain and cytoplasmic domain was inserted to replace murine exon 5-6.

ADAM9 expression analysis in B-hADAM9 MC38 cells by flow cytometry. Single cell suspensions from wild-type MC38 and B-hADAM9 MC38 cultures were stained with species-specific anti-ADAM9 antibody. Human ADAM9 was detected on the surface of B-hADAM9 MC38 cells but not wild-type MC38 cells. The 1-A05 clone of B-hADAM9 MC38 cells was used for in vivo experiments.

Subcutaneous homograft tumor growth of B-hADAM9 MC38 cells. B-hADAM9 MC38 cells (3x10⁶) and wild-type MC38 cells (5x10⁵) were subcutaneously implanted into C57BL/6 mice (female, 6-week-old, n=6). Tumor volume and body weight were measured twice a week. (A) Average tumor volume ± SEM. (B)  Body weight (Mean± SEM). Volume was expressed in mm³ using the formula: V=0.5 X long diameter X short diameter². As shown in panel A, B-hADAM9 MC38 cells were able to establish tumors in vivo and can be used for efficacy studies.