HOTAIRM1 and glioblastoma: Reduced TGM2 mRNA and protein levels in HOTAIRM1 stable knock-down LN-229, as well as other glioblastoma cell lines (U87MG, LN-18, and SF126) relative to control-transfected cells, were confirmed by RT-qPCR (Fig. 5A) and Western blotting (Fig. 5B–D).