BDKRB1 and glioblastoma: In conclusion, this study has shown that the frequency of cell-cell interaction by heterotypic fusogenic events, vesicle transfer and entosis in the two established GBM model cell lines, U87 and U373 cells, preferentially with BM-MSC (vs. AT-MSC) is related to cell genotypes /phenotypes, which include differential B1R expression levels.