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TEI-9648, a Vitamin D₃ Lactone analogue, is a potent and specific vitamin D receptor (VDR) antagonist. TEI-9648 inhibits VDR/VDRE-mediated genomic actions of 1α,25(OH)₂D₃. TEI-9648 also inhibits HL-60 cell differentiation induced by of 1α,25(OH)₂D₃. TEI-9648 has the potential for bone metabolism research.

TEI-9648 (10-1000 nM) dose-dependently blocks the reciprocal changes of CD11b and CD71 expression associated with HL-60 cell differentiation induced by 1α,25(OH)₂D₃.
TEI-9648 has consistently weaker suppressive effect than TEI-9647.
TEI-9648 can not induce cell differentiation even after treatment at 1 μM in HL-60 cell.
TEI-9648 alone can not induce activation of NBT-reducing activity or α-NB esterase activity. In contrast, TEI-9648 markedly suppresses the up-regulation induced by 1α,25(OH)₂D₃ (0.1 nM) in HL-60 cells.

Room temperature in continental US; may vary elsewhere.

4°C, protect from light, stored under nitrogen

*In solvent : -80°C, 6 months; -20°C, 1 month (protect from light, stored under nitrogen)