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Title: Elevated expression of proto-oncogenes accompany enhanced induction of heat-shock genes after exposure of rat embryos in utero to ionizing irradiation

Abstract

We have recently found that the effects of exposing rat embryos in utero to teratogens capable of producing cardiac anomalies were expressed later as enhanced induction of heat-shock proteins (hsp70 family) when embryonic hearts were cultured in vitro. However, it remained to be determined whether heat-shock proteins are induced in vivo after exposure to teratogens. The heat-shock response in some mammalian systems is known to be accompanied by elevated expression of proto-oncogenes. Using gene-specific DNA probes, we examined the levels of the expression (transcription) of heat-shock protein genes and two nuclear proto-oncogenes, c-fos and c-myc, in the embryos removed from irradiated pregnant mother rats 4 or 5 days after the irradiation. We found that the levels of expression in vivo of the hsp70 and c-myc genes in the irradiated embryos increased by approximately twofold as compared with those in the control. The expression in vivo of the c-fos gene was not detected in either the irradiated or non-irradiated embryos. After 0.5-hr incubation in vitro of the embryos, however, the expression of the c-fos gene in the irradiated embryos was highly enhanced whereas the control showed no changes. Although the exact functions of these gene products still remain obscure, the enhancedmore » expression of hsp70 gene(s) and the nuclear proto-oncogenes observed in the present study may reflect repair of intracellular damages and/or regeneration of tissue by compensatory cell proliferation, processes that may disturb the normal program of organogenesis.« less

Authors:
; ; ;  [1]
  1. Hiroshima Univ. (Japan)
Publication Date:
OSTI Identifier:
5224224
Resource Type:
Journal Article
Journal Name:
Teratogenesis, Carcinogenesis, and Mutagenesis; (USA)
Additional Journal Information:
Journal Volume: 9:4; Journal ID: ISSN 0270-3211
Country of Publication:
United States
Language:
English
Subject:
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.; IONIZING RADIATIONS; TERATOGENESIS; ONCOGENES; RADIOINDUCTION; PROTEINS; GENES; DNA REPAIR; EMBRYOS; GENE REGULATION; HEAT; MESSENGER-RNA; RATS; TRANSCRIPTION; ANIMALS; BIOLOGICAL RECOVERY; BIOLOGICAL REPAIR; ENERGY; MAMMALS; NUCLEIC ACIDS; ORGANIC COMPOUNDS; RADIATIONS; RECOVERY; REPAIR; RNA; RODENTS; VERTEBRATES; 560152* - Radiation Effects on Animals- Animals

Citation Formats

Higo, H, Lee, J Y, Satow, Y, and Higo, K. Elevated expression of proto-oncogenes accompany enhanced induction of heat-shock genes after exposure of rat embryos in utero to ionizing irradiation. United States: N. p., 1989. Web. doi:10.1002/tcm.1770090402.
Higo, H, Lee, J Y, Satow, Y, & Higo, K. Elevated expression of proto-oncogenes accompany enhanced induction of heat-shock genes after exposure of rat embryos in utero to ionizing irradiation. United States. https://doi.org/10.1002/tcm.1770090402
Higo, H, Lee, J Y, Satow, Y, and Higo, K. 1989. "Elevated expression of proto-oncogenes accompany enhanced induction of heat-shock genes after exposure of rat embryos in utero to ionizing irradiation". United States. https://doi.org/10.1002/tcm.1770090402.
@article{osti_5224224,
title = {Elevated expression of proto-oncogenes accompany enhanced induction of heat-shock genes after exposure of rat embryos in utero to ionizing irradiation},
author = {Higo, H and Lee, J Y and Satow, Y and Higo, K},
abstractNote = {We have recently found that the effects of exposing rat embryos in utero to teratogens capable of producing cardiac anomalies were expressed later as enhanced induction of heat-shock proteins (hsp70 family) when embryonic hearts were cultured in vitro. However, it remained to be determined whether heat-shock proteins are induced in vivo after exposure to teratogens. The heat-shock response in some mammalian systems is known to be accompanied by elevated expression of proto-oncogenes. Using gene-specific DNA probes, we examined the levels of the expression (transcription) of heat-shock protein genes and two nuclear proto-oncogenes, c-fos and c-myc, in the embryos removed from irradiated pregnant mother rats 4 or 5 days after the irradiation. We found that the levels of expression in vivo of the hsp70 and c-myc genes in the irradiated embryos increased by approximately twofold as compared with those in the control. The expression in vivo of the c-fos gene was not detected in either the irradiated or non-irradiated embryos. After 0.5-hr incubation in vitro of the embryos, however, the expression of the c-fos gene in the irradiated embryos was highly enhanced whereas the control showed no changes. Although the exact functions of these gene products still remain obscure, the enhanced expression of hsp70 gene(s) and the nuclear proto-oncogenes observed in the present study may reflect repair of intracellular damages and/or regeneration of tissue by compensatory cell proliferation, processes that may disturb the normal program of organogenesis.},
doi = {10.1002/tcm.1770090402},
url = {https://www.osti.gov/biblio/5224224}, journal = {Teratogenesis, Carcinogenesis, and Mutagenesis; (USA)},
issn = {0270-3211},
number = ,
volume = 9:4,
place = {United States},
year = {Sun Jan 01 00:00:00 EST 1989},
month = {Sun Jan 01 00:00:00 EST 1989}
}