Biomaterial Database

[Studies of hypoxic rat brain mitochondrial transcription activity in vitro]. 2001

W X Gao, and J Z Liu, and L P Wu, and M C Cai

Department of Pathophysiology & Institute of High Altitude Medicine, Third Military Medical University, Chongqing 400038, China.

OBJECTIVE To explore the effects of acute and chronic hypoxia on brain mitochondrial transcription activity in vitro of rats. METHODS Animal grouping: Wistar rats were randomized into acute hypoxic group (AH), chronic hypoxic group (CH) and the control. Mitochondrial transcription activity in vitro was measured in each group respectively as well as mitochondrial F0F1-ATPase activity, and effects of environmental ATP concentration on mitochondrial transcription activity in vitro was observed. RESULTS Brain mitochondrial transcription activity and F0F1-ATPase activity were marked depressed in AH while partly reversed in CH, and they were linearly related. Mitochondrial transcription activity in vitro was affected by ATP concentration diphasely. CONCLUSIONS Acute hypoxia may impair brain mitochondria energy metabolism by way of depressing mitochondrial transcription and then partially recover during chronic hypoxia. And mitochondrial transcription in vitro might be precisely regulated by ATP concentration.

UI	MeSH Term	Description	Entries
D008297	Male		Males
D008928	Mitochondria	Semiautonomous, self-reproducing organelles that occur in the cytoplasm of all cells of most, but not all, eukaryotes. Each mitochondrion is surrounded by a double limiting membrane. The inner membrane is highly invaginated, and its projections are called cristae. Mitochondria are the sites of the reactions of oxidative phosphorylation, which result in the formation of ATP. They contain distinctive RIBOSOMES, transfer RNAs (RNA, TRANSFER); AMINO ACYL T RNA SYNTHETASES; and elongation and termination factors. Mitochondria depend upon genes within the nucleus of the cells in which they reside for many essential messenger RNAs (RNA, MESSENGER). Mitochondria are believed to have arisen from aerobic bacteria that established a symbiotic relationship with primitive protoeukaryotes. (King & Stansfield, A Dictionary of Genetics, 4th ed)	Mitochondrial Contraction,Mitochondrion,Contraction, Mitochondrial,Contractions, Mitochondrial,Mitochondrial Contractions
D001921	Brain	The part of CENTRAL NERVOUS SYSTEM that is contained within the skull (CRANIUM). Arising from the NEURAL TUBE, the embryonic brain is comprised of three major parts including PROSENCEPHALON (the forebrain); MESENCEPHALON (the midbrain); and RHOMBENCEPHALON (the hindbrain). The developed brain consists of CEREBRUM; CEREBELLUM; and other structures in the BRAIN STEM.	Encephalon
D000818	Animals	Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA.	Animal,Metazoa,Animalia
D000860	Hypoxia	Sub-optimal OXYGEN levels in the ambient air of living organisms.	Anoxia,Oxygen Deficiency,Anoxemia,Deficiency, Oxygen,Hypoxemia,Deficiencies, Oxygen,Oxygen Deficiencies
D014158	Transcription, Genetic	The biosynthesis of RNA carried out on a template of DNA. The biosynthesis of DNA from an RNA template is called REVERSE TRANSCRIPTION.	Genetic Transcription
D017208	Rats, Wistar	A strain of albino rat developed at the Wistar Institute that has spread widely at other institutions. This has markedly diluted the original strain.	Wistar Rat,Rat, Wistar,Wistar Rats
D051381	Rats	The common name for the genus Rattus.	Rattus,Rats, Laboratory,Rats, Norway,Rattus norvegicus,Laboratory Rat,Laboratory Rats,Norway Rat,Norway Rats,Rat,Rat, Laboratory,Rat, Norway,norvegicus, Rattus
D025261	Mitochondrial Proton-Translocating ATPases	Proton-translocating ATPases responsible for ADENOSINE TRIPHOSPHATE synthesis in the MITOCHONDRIA. They derive energy from the respiratory chain-driven reactions that develop high concentrations of protons within the intermembranous space of the mitochondria.	Electron Transport Complex V,Mitochondrial ATP Synthase,Respiratory Complex V,Mitochondrial ATP Synthases,Mitochondrial F(1)F(0) ATPase,ATP Synthase, Mitochondrial,ATP Synthases, Mitochondrial,ATPases, Mitochondrial Proton-Translocating,Mitochondrial Proton Translocating ATPases,Proton-Translocating ATPases, Mitochondrial