During the pre-implantation phase of development, the mouse embryo synthesizes HSC70, and HSP90α and β at a very high rate. After implantation, the expression of HSPs appears non-coordinated and is not uniform in the different tissues. The expression of inducible HSPs appears later in development than that of constitutive members of the family. HSP25 is highly expressed early in heart and muscle development, but also in some structure of the central nervous system. HSC70 and HSP90β are expressed ubiquitously, but their expression reaches very high levels in the nervous system (neural tracks) and during bone morphogenesis (in the hypertrophic chondrocytes). The mechanisms involved in HSP expression during mouse embryogenesis are probably diverse, involving tissue-specific sequences. Although the DNA-binding activity and expression of the second heat shock transcription factor, HSF2, seems to be developmentally regulated, becoming detectable at the blastocyst stage and reaching a peak at day 10 of development, there is no obvious correlation between the level of this factor and the expression of HSPs. HSF2 might be involved in the onset of expression of HSPs, regulate (inhibit) their expression, or control the expression of other developmental genes yet to be discovered.
Cellular and Molecular Life Sciences – Springer Journals
Published: Feb 1, 1997
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