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Expression of 105 k-Da heat shock protein (HSP105) during mouse embryo development was investigated. Although HSP105 was detected scarcely in mouse embryos at gestational day (GD) 8, its level of HSP105 increased markedly in the embryos from GD 9 to 11, and then decreased gradually by GD 14. In contrast, 70 k-Da heat shock cognate protein (HSC70) was detected at constantly high levels in embryo from GD 8 to 17 (before birth). The transient increase in level of HSP105 was observed in most embryonic tissues. Since the levels of HSP105 mRNA was detected at constantly high levels in the embryos between GD 8 and 12, the increased expression of HSP105 at GD 9 to 11 seemed to be regulated at posttranscriptional level. Immunohistochemically, HSP105 as well as HSC70 were localized in the cytoplasm and the nuclei of cells in various mouse embryonic tissues. After treatment of tissue sections with proteinase K, HSP105 but not HSC70 was also found to be localized in condensed cells and condensed bodies which showed the typical characteristics of apoptotic cells and apoptotic bodies at the interdigital regions of limbs. These findings suggest that HSP105 plays important roles during mouse embryo development.

Characteristic Expression of High Molecular Mass Heat Shock Protein HSP105 during Mouse Embryo Development.