Expression of heat shock genes (hsp70) in the mammalian brain: Distinguishing constitutively expressed and hyperthermia‐inducible mRNA species
Journal of Neuroscience Research, ISSN: 1097-4547, Vol: 25, Issue: 1, Page: 14-19
1990
- 79Citations
- 4Captures
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Metrics Details
- Citations79
- Citation Indexes79
- 79
- CrossRef69
- Captures4
- Readers4
Article Description
The mammalian genome contains both constitutively expressed and heat‐shock‐inducible members of the hsp70 gene family. Riboprobes derived from members of these two classes of heat shock genes were utilized in Northern blot studies to analyze brain mRNA isolated from control rabbits and rats and from animals subjected to hyperthermic treatment. Ariboprobe derived from a constitutively expresed hsp70 gene detected a 2.5 kilobase (kb) mRNA species in control rat brain. These brain mRNAs showed little change in abundance in animals which were subjected to hyperthermic treatment. A riboprobe derived from a heat‐shock‐inducible hsp70 gene detected an abundant 2.7 kb brain transcript in hyperthermic rabbits which was not apparent in control animals. A time course study revealed that the induction of this mRNA species was transient and paralleled the rise and fall in body temperature. Peak induction was observed at 1 hr. The level of this message had greatly decreased by 5 hr and only trace levels were present at 10 and 24 hr. In the rat brain the induced hsp70 mRNA species was slightly larger than that observed in rabbit (2.9 kb vs. 2.7 kb). The riboprobe which detected the hyperthermia‐inducible mRNA species was highly specific and did not cross react to the constitutively expressed mRNA species under the conditions employed in the Northern blot studies. Copyright © 1990 Wiley‐Liss, Inc.
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