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Expression of heat shock genes during differentiation of mammalian osteoblasts and promyelocytic leukemia cells

The progressive differentiation of both normal rat osteoblasts and HL‐60 promyelocytic leukemia cells involves the sequential expression of specific genes encoding proteins that are characteristic of their respective developing cellular phenotypes. In addition to the selective expression of various phenotype marker genes, several members of the heat shock gene family exhibit differential expression throughout the developmental sequence of these two cell types. As determined by steady state mRNA levels, in both osteoblasts and HL‐60 cells expression of hsp27, hsp60, hsp70, hsp89α, and hsp89β may be associated with the modifications in gene expression and cellular architecture that occur during differentiation.