LTBP3 and plasma cell myeloma: MALAT-1 has been reported to activate the transcription of latent-transforming growth factor beta-binding protein 3 (LTBP3), a transforming growth factor beta (TGF-β) bioactivity-regulating gene [45], by recruiting transcription factor Sp1 to the LTBP3 promoter in MSCs from myeloma patients [46].