Expression of early gene proteins, structural changes in brain neurons in hypobaric hypoxia, and the correcting effects of preconditioning.
The Nissl method and immunocytochemistry were used to study the effects of severe hypobaric hypoxia and its actions in combination with the preconditioning actions of moderate hypoxia on the expression of the early gene proteins c-Fos and NGFI-A as well as structural changes in hippocampal and neocortical neurons in the rat brain. Severe hypoxia was found to suppress c-Fos and NGFI-A synthesis (3-24 h after exposure) and to induce delayed (days 3-7) structural damage to neurons, of the "light" and predominantly the "dark" types, which appear to reflect the development of necrotic and apoptotic processes respectively. Preconditioning with the regime used here corrected these derangements, resulting in increases in the expression of early gene proteins and significant reductions in structural damage to neurons after severe hypoxia.
Rybnikova
E A
EA
Laboratory for the Regulation of Brain Neuron Function, I. P. Pavlov Institute of Physiology, St. Petersburg.
Khozhai
L I
LI
Tyul'kova
E I
EI
Glushchenko
T S
TS
Sitnik
N A
NA
Pelto-Huikko
M
M
Otellin
V A
VA
Samoilov
M O
MO
D000818:Animals; D004268:DNA-Binding Proteins / Q000378:metabolism; D051766:Early Growth Response Protein 1; D017781:Genes, Immediate-Early / Q000502:physiology*; D002534:Hypoxia, Brain / Q000378:metabolism / Q000473:pathology*; D017874:Immediate-Early Proteins / Q000378:metabolism; D007150:Immunohistochemistry / Q000379:methods; D019194:Ischemic Preconditioning / Q000379:methods*; D009474:Neurons / Q000378:metabolism* / Q000473:pathology; D016760:Proto-Oncogene Proteins c-fos / Q000378:metabolism; D051381:Rats; D017208:Rats, Wistar; D013194:Staining and Labeling / Q000379:methods; D014157:Transcription Factors / Q000378:metabolism
D004268:DNA-Binding Proteins; D051766:Early Growth Response Protein 1; D017874:Immediate-Early Proteins; D016760:Proto-Oncogene Proteins c-fos; D014157:Transcription Factors