| pubmed-article:7236236 | rdf:type | pubmed:Citation | lld:pubmed |
| pubmed-article:7236236 | lifeskim:mentions | umls-concept:C0039067 | lld:lifeskim |
| pubmed-article:7236236 | lifeskim:mentions | umls-concept:C1882598 | lld:lifeskim |
| pubmed-article:7236236 | lifeskim:mentions | umls-concept:C1158862 | lld:lifeskim |
| pubmed-article:7236236 | lifeskim:mentions | umls-concept:C1816453 | lld:lifeskim |
| pubmed-article:7236236 | lifeskim:mentions | umls-concept:C0851285 | lld:lifeskim |
| pubmed-article:7236236 | pubmed:issue | 2 | lld:pubmed |
| pubmed-article:7236236 | pubmed:dateCreated | 1981-7-20 | lld:pubmed |
| pubmed-article:7236236 | pubmed:abstractText | Studies were performed to elucidate factors involved in the regulation of pyruvate dehydrogenase activity in rat brain synaptosomes during membrane depolarization. Addition of 24 mM-KCl to synaptosomes resulted in increases in rates of O2 consumption (90%) and [1-(14)C]pyruvate decarboxylation (85%) and in the active/total ratio of extractable pyruvate dehydrogenase (90--100%) within 10 s. Neither pyruvate (10 mM) nor dichloroacetate (10 mM) affected the activation state of the enzyme complex. Also, the activation state of pyruvate dehydrogenase was unaffected by addition of 1 mM-octanoate, L-(--)-carnitine, 3-hydroxybutyrate, glutamate, citrate, lactate, L-malate, acetate, acetaldehyde or ethanol. Removal of Ca2+ by using EGTA lowered the active/total ratio to about 70%, although the rate of O2 consumption and pyruvate decarboxylation was unaffected. Rates of pyruvate decarboxylation in the presence of carbonyl cyanide p-trifluoromethoxyphenylhydrazone in the presence and absence of NaF and EGTA demonstrated a linear correlation with changes in the activity of the enzyme complex. This observation indicated that a change in the activation state of pyruvate dehydrogenase from 90 to 100% active could result in a 27% increase in the rate of pyruvate decarboxylation. It is suggested that the pyruvate dehydrogenase complex is an important site for the regulation of substrate utilization in rat brain synaptosomes. Further, the phosphorylation/dephosphorylation system and direct feedback-inhibitory effects on the enzyme complex both play a significant role in rapidly adapting pyruvate decarboxylation to changes in the requirements for mitochondrial energy production. | lld:pubmed |
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| pubmed-article:7236236 | pubmed:language | eng | lld:pubmed |
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| pubmed-article:7236236 | pubmed:citationSubset | IM | lld:pubmed |
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| pubmed-article:7236236 | pubmed:status | MEDLINE | lld:pubmed |
| pubmed-article:7236236 | pubmed:month | Nov | lld:pubmed |
| pubmed-article:7236236 | pubmed:issn | 0264-6021 | lld:pubmed |
| pubmed-article:7236236 | pubmed:author | pubmed-author:OlsonM SMS | lld:pubmed |
| pubmed-article:7236236 | pubmed:author | pubmed-author:SchafferW TWT | lld:pubmed |
| pubmed-article:7236236 | pubmed:issnType | Print | lld:pubmed |
| pubmed-article:7236236 | pubmed:day | 15 | lld:pubmed |
| pubmed-article:7236236 | pubmed:volume | 192 | lld:pubmed |
| pubmed-article:7236236 | pubmed:owner | NLM | lld:pubmed |
| pubmed-article:7236236 | pubmed:authorsComplete | Y | lld:pubmed |
| pubmed-article:7236236 | pubmed:pagination | 741-51 | lld:pubmed |
| pubmed-article:7236236 | pubmed:dateRevised | 2011-10-3 | lld:pubmed |
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| pubmed-article:7236236 | pubmed:meshHeading | pubmed-meshheading:7236236-... | lld:pubmed |
| pubmed-article:7236236 | pubmed:year | 1980 | lld:pubmed |
| pubmed-article:7236236 | pubmed:articleTitle | The regulation of pyruvate oxidation during membrane depolarization of rat brain synaptosomes. | lld:pubmed |
| pubmed-article:7236236 | pubmed:publicationType | Journal Article | lld:pubmed |
| pubmed-article:7236236 | pubmed:publicationType | In Vitro | lld:pubmed |
| pubmed-article:7236236 | pubmed:publicationType | Research Support, U.S. Gov't, P.H.S. | lld:pubmed |
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