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Titolo:
DECREASED ENERGY-METABOLISM IN BRAIN-STEM DURING CENTRAL RESPIRATORY DEPRESSION IN RESPONSE TO HYPOXIA
Autore:
LAMANNA JC; HAXHIU MA; KUTINANELSON KL; PUNDIK S; EROKWU B; YEH ER; LUST WD; CHERNIACK NS;
Indirizzi:
CASE WESTERN RESERVE UNIV,SCH MED,DEPT NEUROL CLEVELAND OH 44106
Titolo Testata:
Journal of applied physiology
fascicolo: 4, volume: 81, anno: 1996,
pagine: 1772 - 1777
SICI:
8750-7587(1996)81:4<1772:DEIBDC>2.0.ZU;2-6
Fonte:
ISI
Lingua:
ENG
Soggetto:
MEDULLARY VENTRAL SURFACE; INTRACELLULAR PH; NEUTRAL RED; GLUCOSE DEPRIVATION; OXYGEN; RATS; NEURONS; INVIVO; SPECTROPHOTOMETRY; ACIDIFICATION;
Keywords:
VENTRAL MEDULLA OBLONGATA; INTRACELLULAR PH; ADENOSINE 5'-TRIPHOSPHATE; PHOSPHOCREATINE; LACTATE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
37
Recensione:
Indirizzi per estratti:
Citazione:
J.C. Lamanna et al., "DECREASED ENERGY-METABOLISM IN BRAIN-STEM DURING CENTRAL RESPIRATORY DEPRESSION IN RESPONSE TO HYPOXIA", Journal of applied physiology, 81(4), 1996, pp. 1772-1777

Abstract

Metabolic changes in the brain stem were measured at the time when oxygen deprivation-induced respiratory depression occurred. Eucapnic ventilation with 8% oxygen in vagotomized urethan-anesthetized rats resulted in cessation of respiratory drive, monitored by recording diaphragm electromyographic activity, on average within II min (range 5-27 min), presumably via central depressant mechanisms. At that time, the brain stems were frozen in situ for metabolic analyses. By using 20-mu m lyophilized sections from frozen-fixed brain stem, microregional analyses of ATP, phosphocreatine, lactate, and intracellular pH were made from 1) the ventral portion of the nucleus gigantocellularis and the parapyramidal nucleus; 2) the compact and ventral portions of the nucleus ambiguus; 3) midline neurons; 4) nucleus tractus solitarii; and 5) the spinal trigeminal nucleus. At the time of respiratory depression, lactate was elevated threefold in all regions. Both ATP and phosphocreatine were decreased to 50 and 25% of control, respectively. Intracellular pH was more acidic by 0.2-0.4 unit in these regions but was relatively preserved in the chemosensitive regions near the ventral and dorsal medullary surfaces. These results show that hypoxia-induced respiratory depression was accompanied by metabolic changes within brain stemregions involved in respiratory and cardiovascular control. Thus it appears that there was significant energy deficiency in the brain stem after hypoxia-induced respiratory depression had occurred.

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Documento generato il 03/04/20 alle ore 20:30:10