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DIF-1 is a cell growth suppressor that promotes differentiation in HL-60 cells.

ChEBI: A differentiation-inducing factor that is hexaphenone bearing two chloro substituents at positions 3 and 5, two hydroxy substituents at positions 2 and 6 as well as a single methoxy substituent at position 4. A secreted, chlorinated molecule that controls ell fate during development of Dictyostelium cells.

DIF-1 (differentiation-inducing factor-1) is isolated from a Dictyostelium slime moldand is used to inhibit proliferation/promote differentiation in various cell lines.''DIF-1 is a cell differentiation inducing factor.
Differentiation-inducing factor-1 (DIF-1) blocks the migration and invasion of cells and decreases the expression of matrix metalloproteinase-2. It prevents the proliferation of cells using glycogen synthase kinase-3 (GSK-3)-dependent mechanism. DIF-1 is more active when compared to DIF-2 in promoting stalk cell differentiation under submerged assay conditions.