Linked Life Data

6403527

Source:http://linkedlifedata.com/resource/pubmed/id/6403527

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
7
pubmed:dateCreated
1983-5-5
pubmed:abstractText
Glomeruli isolated from murine and human renal cortex metabolize arachidonic acid to prostaglandins via the cyclooxygenase pathway but whether such glomeruli can also metabolize arachidonic acid via the lipoxygenase pathway is controversial. [1-14C]Arachidonic acid was incubated with glomeruli or glomerular fractions isolated from rat and human renal cortex. The products were extracted, purified by high performance liquid chromatography, and identified by comparison of their retention times with those of authentic hydroxyeicosatetraenoic acid (HETE) standards and by gas chromatography-mass spectrometry. At low substrate concentrations, human glomeruli synthesized in equivalent amounts 12- and 15-HETE, whereas rat glomeruli synthesized only 12-HETE and in larger quantities than in man. At higher substrate concentrations, both species synthesized 12- and 15-HETE and the rate of synthesis for both products was higher in human glomeruli. No other HETE was detected in either species. The lipoxygenase products were stored within the glomeruli and recovered almost equally in the 10,000 x g pellet and in the 100,000 X g supernatant of the homogenized glomeruli. The properties of the lipoxygenase system were the following: the enzyme was distributed equally in the membranes and the cytosol; 12-HETE accumulation was linear with time over 15 min; and 12-HETE production correlated linearly with the amount of glomerular protein. 12-Lipoxygenase activity was maximum at pH 7.5 (rat) or 9.0 (human) and at 40-42 degrees C (both species). Km values calculated at low concentrations of substrate (10-200 microM) were for 15-HETE, 125 and 667 microM with murine and human glomeruli, respectively, and for 12-HETE, 44 microM with the glomeruli of both species. This study demonstrates lipoxygenase activity in murine and, for the first time, in human glomeruli. The products of such enzymatic activity, 12- and 15-HETE, may mediate the glomerular inflammatory response in various experimental or spontaneous glomerular diseases.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Apr
pubmed:issn
0021-9258
pubmed:author
pubmed:issnType
Print
pubmed:day
10
pubmed:volume
258
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
4325-30
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
1983
pubmed:articleTitle
Metabolism of arachidonic acid via the lipoxygenase pathway in human and murine glomeruli.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't