PUBLICATION
Differential regulation of spontaneous and heat-induced HSP 70 expression in developing zebrafish (Danio rerio)
- Authors
- Yeh, F.-L. and Hsu, T.
- ID
- ZDB-PUB-020912-14
- Date
- 2002
- Source
- The Journal of experimental zoology 293(4): 349-359 (Journal)
- Registered Authors
- Keywords
- none
- MeSH Terms
-
- Animals
- DNA-Binding Proteins/biosynthesis
- Enzyme Inhibitors
- Gene Expression Profiling
- Gene Expression Regulation, Developmental
- HSP70 Heat-Shock Proteins*/genetics
- Heat-Shock Proteins/biosynthesis
- Hot Temperature
- Transcription Factors/genetics
- Zebrafish*/genetics
- PubMed
- 12210118 Full text @ J. Exp. Zool.
Citation
Yeh, F.-L. and Hsu, T. (2002) Differential regulation of spontaneous and heat-induced HSP 70 expression in developing zebrafish (Danio rerio). The Journal of experimental zoology. 293(4):349-359.
Abstract
A spontaneous high expression of heat shock protein 70 (HSP 70) was found to arise in zebrafish (Danio rerio) at the larval stage (84 hr after fertilization). The level of HSP 70 in 84-hr-old larvae was estimated to be six- to eightfold that of 12-hr-old embryos. As heat- induced HSP 70 synthesis in many eukaryotic organisms is known to be mediated by a transcriptional-dependent pathway activated by heat shock factor 1 (HSF-1), we then examined if the spontaneous and heat-induced HSP 70 synthesis in zebrafish were controlled by the same mechanism. Although the transient increase of a 62-kDa HSF-1-like polypeptide in 72 - to 96-hr-old larvae seemed to correlate with the onset of the spontaneous HSP 70 production, an anti-HSF-1 antibody cocktail supershifted the heat shock element (HSE) binding complex induced by stressed but not by unstressed zebrafish extracts. Northern blot and quantitative RT-PCR analysis demonstrated the predominant presence of the cognate form of hsp 70 mRNA (hsc 70 mRNA) in developing zebrafish. The extent of heat-induced HSP 70 production in 84-hr-old larvae matched well with a dramatic increase in hsp 70 mRNA accumulation, while no apparent increase in total hsp 70 mRNA could be detected in 72- to 84-hr -old unstressed larvae by northern blot analysis. The stable expression of hsc 70 mRNA specific to beta-actin mRNA in normal zebrafish was confirmed by RT-PCR analysis. Hence, the spontaneous high expression of HSP 70 in zebrafish is believed to be controlled by a mechanism different from the HSF-1-dependent transcriptional activation of hsp 70 under heat stress.
Genes / Markers
Expression
Phenotype
Mutations / Transgenics
Human Disease / Model
Sequence Targeting Reagents
Fish
Orthology
Engineered Foreign Genes
Mapping